Patent Publication Number: US-2021169390-A1

Title: Electronic device for providing guide information

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is based on and claims priority under 35 U.S.C. 119 to Korean Patent Application No. 10-2019-0161960, filed on Dec. 6, 2019, in the Korean Intellectual Property Office, the disclosure of which is herein incorporated by reference in its entirety. 
     TECHNICAL FIELD 
     Certain embodiments relate to an electronic device for providing guide information. 
     BACKGROUND 
     Biological signals, such as a heart rate, a heart rhythm, an electrocardiogram (ECG), a photoplethysmography (PPG), a blood pressure, a blood-oxygen saturation level, a respiratory rate, a blood sugar level, and a body temperature, may be used as indicators for predicting a user or patient condition. Information based on biological signals may be variously used not only for medical treatment of a patient, but also for general; health care. A user may detect biological signals, such as a heart rate, a heart rhythm, an electrocardiogram (ECG), and a photoplethysmography (PPG), by using an electronic device attached to the body of the user. 
     SUMMARY 
     A biological signal measurement device may have a plurality of pads, each of which may be provided with one or more measuring electrodes, and each of the pads may be connected to a circuit device via one or more conducting wires. In such a the measurement device, each pad may be attached to a user&#39;s body, in which the number and placement of the attached measurement electrodes may be determined somewhat freely, which may allow the measurement device to have an increased degree of accuracy in measurement. However, when a patient attaches an electrocardiogram patch by himself/herself at home, the electrocardiogram patch may not be attached at an optimal position, compared to attachment by a trained medical specialist, and thus there may be an resultant increase in digital noise of an electrocardiogram signal. 
     An electronic device according to certain embodiments may generate guide information based on a biological signal to guide a user to a position at which an electrocardiogram patch is to be attached. 
     An electronic device according to certain embodiments may generate guide information based on angle information of an electrocardiogram patch to guide a user to a position at which the electrocardiogram patch is to be attached. 
     The problem to be solved of the disclosure is not limited to the above-mentioned problem, and may be variously expanded without departing from the disclosure. 
     An electronic device according to certain embodiments may include: a housing, a first, second, third and fourth electrode coupled to the housing, a communication module, and a processor, configured to: detect a first signal using the first electrode and the fourth electrode, detect a second signal using the second electrode and the fourth electrode, detect a third signal using the third electrode and the fourth electrode, transmit the first signal, the second signal, and the third signal to an external electronic device via the communication module, and receive, from the external electronic device, via the communication module, data for generating guidance information to correct an attachment position of the electronic device, wherein the guidance information is generated based on: a first biological signal generated based on the first signal and the second signal, a second biological signal generated based on the second signal and the third signal, and a third biological signal generated based on the third signal and the first signal. 
     An electronic device according to certain embodiments may include: a housing, a communication module, and a processor disposed in the housing, wherein the processor is configured to: receive, via the communication module, a plurality of signals generated from a first, second, third and fourth electrode of an external electronic device, including: a first signal generated using the first electrode and the fourth electrode, a second signal generated using the second electrode and the fourth electrode, and a third signal generated using the third electrode and the fourth electrode, determine a first biological signal based on the first signal and the second signal, determine a second biological signal based on the second signal and the third signal, determine a third biological signal based on the third signal and the first signal, generate correction data indicating a correction to an attachment position of the external electronic device, based on the first biological signal, the second biological signal, and the third biological signal, and transmit the correction data to the external electronic device via the communication module. 
     An electronic device according to certain embodiments may include: a housing, a first, second, third, and fourth electrode coupled to the housing, a processor, configured to: detect a first signal using the first electrode and the fourth electrode, detect a second signal using the second electrode and the fourth electrode, detect a third signal using the third electrode and the fourth electrode, generate a first biological signal based on the first signal and the second signal, generate a second biological signal based on the second signal and the third signal, generate a third biological signal based on the third signal and the first signal, and generate correction data indicating a correction to an attachment position of the external electronic device, based on the first biological signal, the second biological signal, and the third biological signal. 
     According to certain embodiments, an electronic device or a biological signal measurement device can increase accuracy in biological signal measurement by providing, to a user, guide information regarding a position to which the biological signal measurement device is to be moved, based on a biological signal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of the disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a block diagram an electronic device in a network environment according to certain embodiments; 
         FIG. 2  is a block diagram illustrating a biological signal measurement device according to certain embodiments; 
         FIG. 3  is an exploded perspective view illustrating a biological signal measurement device according to certain embodiments; 
         FIG. 4  is a perspective view illustrating a biological signal measurement device according to certain embodiments in the assembled state; 
         FIG. 5  is an exploded perspective view illustrating a measurement module of a biological signal measurement device according to certain embodiments; 
         FIG. 6  is an exploded perspective view illustrating the arrangement of a first electrode in a measurement module of a biological signal measurement device according to certain embodiments; 
         FIG. 7  is a bottom view illustrating a measurement module of a biological signal measurement device according to certain embodiments; 
         FIG. 8  is a side view illustrating a measurement module of the biological signal measurement device according to certain embodiments; 
         FIG. 9  is an exploded perspective view illustrating a coupling member in an attachment pad of a biological signal measurement device according to certain embodiments; 
         FIG. 10  is a plan view illustrating a coupling member in an attachment pad of a biological signal measurement device according to certain embodiments; 
         FIG. 11  is a bottom view illustrating a coupling member in an attachment pad of a biological signal measurement device according to certain embodiments; 
         FIG. 12  is an exploded perspective view illustrating a pad body in an attachment pad of a biological signal measurement device according to certain embodiments; 
         FIG. 13  is a plan view illustrating a pad body in an attachment pad of a biological signal measurement device according to certain embodiments; 
         FIG. 14  illustrates various shapes of an attachment pad of a biological signal measurement device according to certain embodiments; 
         FIG. 15  is a perspective view of the front surface of an electronic device according to certain embodiments; 
         FIG. 16  is a perspective view of the rear surface of an electronic device according to certain embodiments; 
         FIG. 17  is an exploded perspective view of an electronic device according to certain embodiments; 
         FIG. 18  illustrates a biological signal measurement device attached to a user according to certain embodiments; 
         FIG. 19A  illustrates a biological signal generated based on a signal sensed using an electronic device according to certain embodiments, and  FIG. 19B  illustrates a biological signal generated based on a signal sensed using an electronic device according to certain embodiments; 
         FIG. 20  is a view for describing a preconfigured biological signal according to certain embodiments; 
         FIG. 21A  illustrates a biological signal changed based on the position of an electronic device according to certain embodiments,  FIG. 21B  illustrates a biological signal changed based on the position of an electronic device according to certain embodiments,  FIG. 21C  illustrates a biological signal changed based on the position of an electronic device according to certain embodiments, and  FIG. 21D  illustrates a biological signal changed based on the position of an electronic device according to certain embodiments; 
         FIG. 22  is a view for describing angle information generated using an acceleration sensor according to certain embodiments; 
         FIG. 23  illustrates a biological signal measurement device for outputting guide information, based on a biological signal according to certain embodiments; 
         FIG. 24  illustrates an electronic device for outputting guide information of a biological signal measurement device according to certain embodiments, and  FIG. 25  illustrates an electronic device for outputting guide information of a biological signal measurement device according to certain embodiments; 
         FIG. 26  is a flowchart for describing a method for transmitting a sensed signal and receiving guide information, by using an electronic device according to certain embodiments; 
         FIG. 27  is a flowchart for describing a method for transmitting a sensed signal and angle information and receiving guide information, by using an electronic device according to certain embodiments; 
         FIG. 28  is a flowchart for describing a method for outputting guide information by an electronic device for sensing a signal and by another electronic device for generating guide information, based on the sensed signal according to certain embodiments; 
         FIG. 29  is a flowchart for describing a method for outputting guide information by an electronic device for sensing an electrical signal and an angle and by another electronic device for generating guide information, based on the sensed signal and angle information; 
         FIG. 30  is a flowchart for describing a method in which an electronic device generates guide information, based on multiple sensed signals according to certain embodiments; and 
         FIG. 31  is a flowchart for describing a method in which an electronic device generates guide information, based on multiple sensed signals and angle information according to certain embodiments. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a block diagram illustrating an electronic device  101  in a network environment  100  according to certain embodiments. Referring to  FIG. 1 , the electronic device  101  in the network environment  100  may communicate with an electronic device  102  via a first network  198  (e.g., a short-range wireless communication network), or an electronic device  104  or a server  108  via a second network  199  (e.g., a long-range wireless communication network). According to an embodiment, the electronic device  101  may communicate with the electronic device  104  via the server  108 . According to an embodiment, the electronic device  101  may include a processor  120 , memory  130 , an input device  150 , a sound output unit  155 , a display device  160 , an audio module  170 , a sensor module  176 , an interface  177 , a haptic module  179 , a camera module  180 , a power management module  188 , a battery  189 , a communication module  190 , a subscriber identification module (SIM)  196 , or an antenna module  197 . In some embodiments, at least one (e.g., the display device  160  or the camera module  180 ) of the components may be omitted from the electronic device  101 , or one or more other components may be added in the electronic device  101 . In some embodiments, some of the components may be implemented as single integrated circuitry. For example, the sensor module  176  (e.g., a fingerprint sensor, an iris sensor, or an illuminance sensor) may be implemented as embedded in the display device  160  (e.g., a display). 
     The processor  120  may execute, for example, software (e.g., a program  140 ) to control at least one other component (e.g., a hardware or software component) of the electronic device  101  coupled with the processor  120 , and may perform various data processing or computation. According to an embodiment, as at least part of the data processing or computation, the processor  120  may load a command or data received from another component (e.g., the sensor module  176  or the communication module  190 ) in volatile memory  132 , process the command or the data stored in the volatile memory  132 , and store resulting data in non-volatile memory  134 . According to an embodiment, the processor  120  may include a main processor  121  (e.g., a central processing unit (CPU) or an application processor (AP)), and an auxiliary processor  123  (e.g., a graphics processing unit (GPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, or in conjunction with, the main processor  121 . Additionally or alternatively, the auxiliary processor  123  may be adapted to consume less power than the main processor  121 , or to be specific to a specified function. The auxiliary processor  123  may be implemented as separate from, or as part of the main processor  121 . 
     The auxiliary processor  123  may control, for example, at least some of functions or states related to at least one component (e.g., the display device  160 , the sensor module  176 , or the communication module  190 ) among the components of the electronic device  101 , instead of the main processor  121  while the main processor  121  is in an inactive (e.g., sleep) state, or together with the main processor  121  while the main processor  121  is in an active (e.g., executing an application) state. According to an embodiment, the auxiliary processor  123  (e.g., an image signal processor or a communication processor) may be implemented as part of another component (e.g., the camera module  180  or the communication module  190 ) functionally related to the auxiliary processor  123 . 
     The memory  130  may store various data used by at least one component (e.g., the processor  120  or the sensor module  176 ) of the electronic device  101 . The various data may include, for example, software (e.g., the program  140 ) and input data or output data for a command related thereto. The memory  130  may include the volatile memory  132  or the non-volatile memory  134 . 
     The program  140  may be stored in the memory  130  as software, and may include, for example, an operating system (OS)  142 , middleware  144 , or an application  146 . 
     The input device  150  may receive a command or data to be used by a component (e.g., the processor  120 ) of the electronic device  101 , from the outside (e.g., a user) of the electronic device  101 . The input device  150  may include, for example, a microphone, a mouse, a keyboard, or a digital pen (e.g., a stylus pen). 
     The sound output unit  155  may output sound signals to the outside of the electronic device  101 . The sound output unit  155  may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as playing multimedia or playing record, and the receiver may be used for incoming calls. According to an embodiment, the receiver may be implemented as separate from, or as part of the speaker. 
     The display device  160  may visually provide information to the outside (e.g., a user) of the electronic device  101 . The display device  160  may include, for example, a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, hologram device, and projector. According to an embodiment, the display device  160  may include touch circuitry adapted to detect a touch, or sensor circuitry (e.g., a pressure sensor) adapted to measure the intensity of force incurred by the touch. 
     The audio module  170  may convert a sound into an electrical signal and vice versa. According to an embodiment, the audio module  170  may obtain the sound via the input device  150 , or output the sound via the sound output unit  155  or an external electronic device (e.g., an electronic device  102  (e.g., a speaker or a headphone)) directly or wirelessly coupled with the electronic device  101 . 
     The sensor module  176  may detect an operational state (e.g., power or temperature) of the electronic device  101  or an environmental state (e.g., a state of a user) external to the electronic device  101 , and then generate an electrical signal or data value corresponding to the detected state. According to an embodiment, the sensor module  176  may include, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. 
     The interface  177  may support one or more specified protocols to be used for the electronic device  101  to be coupled with the external electronic device (e.g., the electronic device  102 ) directly or wirelessly. According to an embodiment, the interface  177  may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface. 
     A connecting terminal  178  may include a connector via which the electronic device  101  may be physically connected with the external electronic device (e.g., the electronic device  102 ). According to an embodiment, the connecting terminal  178  may include, for example, a HDMI connector, a USB connector, a SD card connector, or an audio connector (e.g., a headphone connector). 
     The haptic module  179  may convert an electrical signal into a mechanical stimulus (e.g., a vibration or a movement) or electrical stimulus which may be recognized by a user via his tactile sensation or kinesthetic sensation. According to an embodiment, the haptic module  179  may include, for example, a motor, a piezoelectric element, or an electric stimulator. 
     The camera module  180  may capture a still image and moving images. According to an embodiment, the camera module  180  may include one or more lenses, image sensors, image signal processors, or flashes. 
     The power management module  188  may manage power supplied to the electronic device  101 . According to an embodiment, the power management module  188  may be implemented as at least part of, for example, a power management integrated circuit (PMIC). 
     The battery  189  may supply power to at least one component of the electronic device  101 . According to an embodiment, the battery  189  may include, for example, a primary cell which is not rechargeable, a secondary cell which is rechargeable, or a fuel cell. 
     The communication module  190  may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device  101  and the external electronic device (e.g., the electronic device  102 , the electronic device  104 , or the server  108 ) and performing communication via the established communication channel. The communication module  190  may include one or more communication processors that are operable independently from the processor  120  (e.g., the application processor (AP)) and supports a direct (e.g., wired) communication or a wireless communication. According to an embodiment, the communication module  190  may include a wireless communication module  192  (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module  194  (e.g., a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules may communicate with the external electronic device via the first network  198  (e.g., a short-range communication network, such as Bluetooth™, wireless-fidelity (Wi-Fi) direct, or infrared data association (IrDA)) or the second network  199  (e.g., a long-range communication network, such as a cellular network, the Internet, or a computer network (e.g., LAN or wide area network (WAN)). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as multi components (e.g., multi chips) separate from each other. The wireless communication module  192  may identify and authenticate the electronic device  101  in a communication network, such as the first network  198  or the second network  199 , using subscriber information (e.g., international mobile subscriber identity (IMSI)) stored in the subscriber identification module  196 . 
     The antenna module  197  may transmit or receive a signal or power to or from the outside (e.g., the external electronic device) of the electronic device  101 . According to an embodiment, the antenna module  197  may include an antenna including a radiating element implemented using a conductive material or a conductive pattern formed in or on a substrate (e.g., PCB). According to an embodiment, the antenna module  197  may include a plurality of antennas. In such a case, at least one antenna appropriate for a communication scheme used in the communication network, such as the first network  198  or the second network  199 , may be selected, for example, by the communication module  190  from the plurality of antennas. The signal or the power may then be transmitted or received between the communication module  190  and the external electronic device via the selected at least one antenna. 
     At least some of the above-described components may be coupled mutually and communicate signals (e.g., commands or data) therebetween via an inter-peripheral communication scheme (e.g., a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)). 
     According to an embodiment, commands or data may be transmitted or received between the electronic device  101  and the external electronic device  104  via the server  108  coupled with the second network  199 . Each of the electronic devices  102  and  104  may be a device of a same type as, or a different type, from the electronic device  101 . According to an embodiment, all or some of operations to be executed at the electronic device  101  may be executed at one or more of the external electronic devices  102  or  104 , or a server  108 . For example, if the electronic device  101  should perform a function or a service automatically, or in response to a request from a user or another device, the electronic device  101 , instead of, or in addition to, executing the function or the service, may request the one or more external electronic devices to perform at least part of the function or the service. The one or more external electronic devices receiving the request may perform the at least part of the function or the service requested, or an additional function or an additional service related to the request, and transfer an outcome of the performing to the electronic device  101 . The electronic device  101  may provide the outcome, with or without further processing of the outcome, as at least part of a reply to the request. To that end, a cloud computing, distributed computing, or client-server computing technology may be used, for example. 
     The electronic device according to certain embodiments may be one of various types of electronic devices. The electronic devices may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. According to an embodiment of the disclosure, the electronic devices are not limited to those described above. 
     It should be appreciated that certain embodiments of the disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include one or more of the things, unless the relevant context clearly indicates otherwise. As used herein, each of such phrases as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C,” may include any one of, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd,” or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). It is to be understood that if an element (e.g., a first element) is referred to, with or without the term “operatively” or “communicatively”, as “coupled with,” “coupled to,” “connected with,” or “connected to” another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element. 
     As used herein, the term “module” may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms such as “logic,” “logic block,” “part,” or “circuitry”. A module may be a single integral component, or a minimum unit or part thereof, adapted to perform one or more functions. For example, according to an embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC). 
     Certain embodiments as set forth herein may be implemented as software (e.g., the program  140 ) including one or more instructions that are stored in a storage medium (e.g., internal memory  136  or external memory  138 ) that is readable by a machine (e.g., the electronic device  101 ). For example, a processor (e.g., the processor  120 ) of the machine (e.g., the electronic device  101 ) may invoke at least one of the one or more instructions stored in the storage medium, and execute it. This allows the machine to be operated to perform at least one function according to the at least one instruction invoked. The one or more instructions may include a code generated by a complier or a code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. The term “non-transitory” simply means that the storage medium is a tangible device, and does not include a signal (e.g., an electromagnetic wave), but this term does not differentiate between where data is semi-permanently stored in the storage medium and where the data is temporarily stored in the storage medium. 
     According to an embodiment, a method according to certain embodiments of the disclosure may be included and provided in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or be distributed (e.g., downloaded or uploaded) online via an application store (e.g., PlayStore™), or between two user devices (e.g., smart phones) directly. If distributed online, at least part of the computer program product may be temporarily generated or at least temporarily stored in the machine-readable storage medium, such as memory of the manufacturer&#39;s server, a server of the application store, or a relay server. According to certain embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities. According to certain embodiments, one or more of the above-described components or operations may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, the integrated component may still perform one or more functions of each of the plurality of components in the same or similar manner as they are performed by a corresponding one of the plurality of components before the integration. According to certain embodiments, operations performed by the module, the program, or another component may be carried out sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order or omitted, or one or more other operations may be added. 
     According to certain embodiments, the term “acquisition” is not limited to one of the term “generation” or “reception”, and may be construed as including at least one of the term “generation” or “reception”. 
       FIG. 2  is a block diagram illustrating a biological signal measurement device  200  according to certain embodiments. 
     The biological signal measurement device  200  may include some or all of the components including, for example, the electronic device  101  of  FIG. 1 . Referring to  FIG. 2 , the biological signal measurement device  200  may include a control unit  201 , a power supply unit  202 , and a mounting unit  231   a , and may further include a storage unit  233   a , a communication unit  235   a , a display unit  237   a , and a measurement unit  239   a  in some embodiments. 
     According to certain embodiments, the control unit  201  may include a Main Control Unit (MCU)  211 , a battery monitor  213 , and an Analog Front End (AFE)  215 . The control unit  211  may include, for example, the processor  120  of  FIG. 1 , and may perform control of the entire biological signal measurement device  200 . In an embodiment, the battery monitor  213  may measure the remaining capacity of a battery  221  included in the power supply unit  202 , or the like. In another embodiment, the AFE  215  may digitize a biological signal such as an analog voltage signal detected through the mounting unit  231   a , and may transmit the digitized biological signal to the control unit  211 . 
     According to certain embodiments, the power supply unit  202  may include a battery  221  and at least one regulator  223 , and in some embodiments, may include the power management module  188  and the battery  189  of  FIG. 1 . In an embodiment, the battery  221  may supply power for driving the biological signal measurement device  200 , and may include a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. In another embodiment, the regulator  223  may convert the power of the battery  221  into a voltage suitable for driving the biological signal measurement device  200  (e.g., the control unit  211 ), and may supply the voltage. 
     According to certain embodiments, the control unit  211  and the power supply unit  202  may be embedded in substantially one housing (e.g., the module housing  301  illustrated in  FIG. 3 , which will be described later). In some embodiments, the housing, in which the power supply unit  202  and the like are embedded, may include a switch device (e.g., an operation unit  311   a  in  FIG. 3 ) for turning power on/off or initiating/terminating measurement. The switch device may be a part of the power supply unit  202  or the control unit  211 . 
     According to certain embodiments, the mounting unit  231   a  may provide a method of attaching the biological signal measurement device  200  to a body of a user or a patient, and may be in direct contact with the user&#39;s body so as to transmit a current or voltage signal to the control unit  211  (e.g., the AFE  215 ). For example, the mounting unit  231   a  may include an electrode(s)  231   b  in contact with the user&#39;s body, and the electrode  231   b  (e.g., a measurement electrode or a third wiring electrode  831   c  in  FIG. 12 ) may be electrically connected to the AFE  215 . 
     According to certain embodiments, the control unit  211  may generate information on the electrocardiogram, the heartbeat, and the like of the user to whom the biological signal measurement device  200  is attached on the basis of the digital signal received through the AFE  215 . In some embodiments, information (e.g., first measurement information) generated by the control unit  211  may be stored in the storage unit  233   a . For example, the storage unit  233   a  may store information generated by the control unit  211  by including a memory  233   b  (e.g., the memory  130  in  FIG. 1 ). 
     According to certain embodiments, the information generated by the control unit  211  or the information stored in the storage unit  233   a  may be transmitted to another electronic device (e.g., the electronic device  102  in  FIG. 1 ) via the communication unit  235   a . In another embodiment, the information generated by the control unit  211  or the information stored in the storage unit  233   a  may be transmitted to still another electronic device (e.g., the electronic device  104  in  FIG. 1 ) or a server (e.g., the server  108  in  FIG. 1 ) via the communication unit  235   a  and via a network (e.g., the network  199  in  FIG. 1 ). For example, the communication unit  235   a  is capable of transmitting generated information or stored information to another electronic device directly or via a network by including a Bluetooth Low Energy (BLE)  235   b . In another embodiment, when the communication unit  235   a  maintains a state of being connected with another electronic device, either directly or via a network, the control unit  211  may transmit the generated information to the other electronic device without storing it in the storage unit  233   a . It is noted the another electronic device  102  may include some or all of the same components of the electronic device illustrated in  FIG. 1  or  FIG. 2 . 
     According to certain embodiments, the display unit  237   a  may output information on the state of the biological signal measurement device  200  under the control of the control unit  211 , for example. According to an embodiment, the display unit  237   a  is capable of visually displaying the remaining charge of the battery, the state of attachment to the user&#39;s body (e.g., whether or not a biological signal is detectable), whether or not communication with another electronic device or the like is possible, and the like by including a light source (e.g., a Light-Emitting Diode (LED)  237   b ). For example, the LED  237   b  may provide various kinds of information to the user through the color, the blinking period, and the like of the output light. Although not illustrated, the display unit  237   a  may output various kinds of information through a speaker (e.g., the sound output unit  155  in  FIG. 1 ), a vibration device (e.g., the haptic module  179  in  FIG. 1 ), a display (e.g., the display device  160  in  FIG. 1 ), and the like, in addition to the above-mentioned light source. The configuration of the display unit  237   a  as described above may be appropriately selected in consideration of the size and usage of the biological signal measurement device  200 , the attachment position of the biological signal measurement device  200  in the user&#39;s body, and the like. 
     According to certain embodiments, the measurement unit  239   a  is capable of measuring a motion (e.g., an amount of motion) of a user who wears or attaches an electronic device (e.g., the biological signal measurement device  200 ). For example, the measurement unit  239   a  may include at least an accelerometer  239   b , and in some embodiments, the measurement unit  239   a  may include a gyro sensor, an atmospheric pressure sensor, a temperature sensor, or a humidity sensor (e.g., the sensor module  176  in  FIG. 1 ) so as to detect the user&#39;s momentum, the environment at the time of measuring a biological signal, and the like. The control unit  211  may generate second measurement information on the user&#39;s momentum, temperature, humidity, etc., detected by the measurement unit  239   a , and may store the second measurement information in the recording unit  233   a . The first measurement information and the second measurement information stored in the biological signal measurement device  200  (e.g., the storage unit  233   a ) are used as basic data capable of analyzing a health condition such as the user&#39;s physical strength. 
       FIG. 3  is an exploded perspective view illustrating a biological signal measurement device  300  according to certain embodiments.  FIG. 4  is a perspective view illustrating the biological signal measurement device  300  according to certain embodiments in the assembled state. 
     Referring to  FIGS. 3 and 4 , an electronic device (e.g., the electronic device  101  in  FIG. 1 ) such as the biological signal measurement device  300  (e.g., the biological signal measurement device  200  in  FIG. 2 ) may include a detachable housing (e.g., a module housing  301 ) and an attachment pad  302 . According to an embodiment, the attachment pad  302  may provide a method for attaching the biological signal measurement device  300  to the user&#39;s body. In some embodiments, the attachment pad  302  may be limited as to the number of times it is capable of being attached to the user&#39;s body in consideration of attachment force or hygiene problems such as contamination and infection, and a medical institution may prescribe single use thereof in principle. The module housing  301  may include therein circuit devices for performing biological signal measurement, such as a control unit  201  and a power supply unit  202  in  FIG. 2 , and may be coupled to the attachment pad  302  by magnetic force. For example, when the attachment pad  302  is to be replaced due to a limit on the number of times of attachment, the measurement module (e.g., the module housing  301 ) may be used by being coupled to a new attachment pad. 
     According to certain embodiments, the bottom surface of the module housing  301  (e.g., the surface facing the attachment pad  302 ) is generally flat and the upper surface is formed in a domed shape. For example, the module housing  301  is capable of accommodating the above-described control unit, power supply unit, and the like therein by forming a dome-shaped internal space. According to an embodiment, the module housing  301  may include an operation unit  311   a  configured to operate a switch device or the like of a power supply unit (e.g., the power supply unit  202  in  FIG. 2 ), and an output unit  311   b  configured to output light, an image, sound, or the like provided via a display unit (e.g., the display unit  237   a  in  FIG. 2 ) to the outside. Since the operation unit  311   a  and the output unit  311   b  are disposed on the upper surface of the module housing  301 , the module housing  301  may be exposed to the outside even when the module housing  301  is coupled to the attachment pad  302 . 
     According to certain embodiments, the attachment pad  302  may include a pad body  321  made of a flexible sheet or the like and a coupling member  323  provided on one surface of the pad body  321 . The coupling member  323  may be provided to enclose a part of the module housing  301 , for example, the bottom surface of the module housing  301 . For example, the coupling member  323  has a substantially circular fence shape protruding from the one surface of the pad body  321 , so that the module housing  301  is capable of providing a certain degree of fixing force while guiding coupling. 
     According to certain embodiments, the biological signal measurement device  300  may include an alignment key structure to set the direction in which the module housing  301  is coupled to the attachment pad  302 . For example, in the state of being aligned in a predetermined direction with respect to the attachment pad  302 , the module housing  301  is capable of being stably coupled to the attachment pad  302  (e.g., the coupling member  323 ). In some embodiments, such an alignment key structure may be configured with a combination of a first alignment key (e.g., a first alignment key  633  of  FIG. 7  to be described below) protruding from the bottom surface of the module housing  301  and a second alignment key (e.g., an alignment recess denoted by reference numeral “ 325 ”) in a depressed shape in the coupling member  323 . The alignment key structure described above may be designed in various shapes and positions, and may guide the module housing  301  in an intended direction for coupling to the attachment pad  302 . 
     According to certain embodiments, an adhesive may be applied to the other surface of the pad body  321  (e.g., the surface opposite the surface on which the coupling member  323  is disposed). For example, the other surface of the pad body  321  (e.g., the bottom surface of the pad body  321 , which is not visible in  FIG. 3 ) may be attached to the user&#39;s body. For attachment to the user&#39;s body, the pad body  321  may be formed of a flexible sheet or the like, and may have various shapes to conform to the bending of the user&#39;s body. For example, the pad body  321  may be manufactured to be easily attached to the user&#39;s body in terms of the material and shape thereof. In some embodiments, the region of the pad body  321  to which the module housing  301  is coupled, for example, the coupling member  323 , may have a certain degree of rigidity. For example, the pad body  321  may stably maintain the coupling state with the module housing  301  while being flexibly deformed to substantially correspond to the bending of the body. 
     According to certain embodiments, the module housing  301  or at least the bottom surface of the module housing  301  may have a regular polygonal or circular shape. The shape of the module housing is capable of providing an environment in which a larger number of electrodes (e.g., electrodes for biological signal detection or electric signal transmission) is capable of being disposed in a limited area (e.g., the area of the bottom surface of the module housing  301 ). In biological signal detection, as the number of electrodes is increased, the accuracy of measurement can be increased. For example, when at least a pair of electrodes among the plurality of electrodes is in contact with the user&#39;s body, it is possible to detect biological signals through the corresponding electrodes. In some embodiments, when a plurality of respective electrodes are in contact with the user&#39;s body, two arbitrarily selected electrodes may be set as leads. For example, when three electrodes are used for biological signal measurement, three pairs of electrode combinations (e.g., leads) are possible, and the detected information is capable of being diversified or improved in accuracy by detecting biological signals through each electrode combination. 
     According to certain embodiments, the electrodes disposed in the module housing  301  are capable of providing a path for transmitting a voltage or current signal or the like substantially corresponding to a detected biological signal, and a measurement electrode(s) to be in contact with the user&#39;s body may be provided on the attachment pad (e.g., on the other surface of the pad body  321 ). For example, the measurement electrodes may be electrically connected to the module housing  301  through wires provided inside the pad body  321  or the coupling member  323 . Since the pad body  321  is capable of being flexibly deformed corresponding to the bending of the body, it is possible to provide an environment in which a sufficient interval can be secured between the measurement electrodes. The arrangement of the measurement electrodes, the electrical connection structure to the module housing  301 , and the like will be described in more detail with reference to  FIG. 12  or the like. 
       FIG. 5  is an exploded perspective view illustrating a measurement module  400  of a biological signal measurement device according to certain embodiments. 
     Referring to  FIG. 5 , the measurement module  400  of the biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 ) according to certain embodiments may accommodate various circuit devices or the like in a space (e.g., the inner space of the module housing  301  in  FIG. 3 ) formed by a combination of a first case member  401   a  and a second case member  401   b , and may include a first electrode  431   a , a second electrode  431   b , a third electrode  431   c , or a fourth electrode  431   d  exposed to the outer surface of the first case member  401   a  (e.g., the bottom surface of the module housing  301  of  FIG. 3 ). In some embodiments, the fourth electrode  431   d  may be provided as a reference electrode for measuring a biological signal (e.g., electrocardiogram). 
     According to certain embodiments, the outer surface of the first case member  401   a  may form the bottom surface of the measurement module  400 , and the first case member  401   a  may include a plurality of first openings  413   a  in order to dispose the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  therein. Stepped surface  413   b  formed around the first openings  413   a  may be disposed in the inner surface I of the first case member  401   a , and the edges of the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  may be fixed to the stepped surfaces  413   b . For example, the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  may be mounted on or fixed to the inner surface I of the first case member  401   a , and may be exposed to the outside of the measurement module  400  through the first openings  413   a . In some embodiments, the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  may be partially positioned to be substantially coplanar with the outer surface of the first case member  401   a , and in other embodiments, the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  may partially protrude from the outer surface of the first case member  401   a  by a predetermined height. 
     According to certain embodiments, the second case member  401   b  may include an operation unit  411   a  (e.g., the operation unit  311   a  in  FIG. 3 ) configured to operate a switch device or the like, and an output unit  411   b  (e.g., the output unit  311   b  in  FIG. 3 ) configured to output light or sound. According to an embodiment, the second case member  401   b  may provide a space that accommodates various circuit devices (e.g., the control unit  201  and the power source unit  202  in  FIG. 2 ). For example, the second case member  401   b  may have a substantially polyhedral or domed shape, and the inner space may be closed when the first case member  401   a  is coupled to the second case member  401   b.    
     According to certain embodiments, the measurement module  400  may include a support member  421  and a circuit board  423  disposed inside the second case member  401   b . In an embodiment, the circuit board  423  is fixed on or above the inner surface of the second case member  401   b  via the support member  421 . The circuit device (s) of the measurement module  400  may be mounted or disposed on the circuit board  423 . According to an embodiment, the support member  421  may include a support structure on which the circuit board  423  is supported or fixed, and although not illustrated in the drawings, a battery (e.g., the battery  189  or  221  in  FIG. 1  or  FIG. 2 ) may be disposed between the circuit board  423  and the support member  421 . For example, the circuit board  423  may be coupled to the support member  421  and may be disposed so as to partially surround the space in which the battery is mounted. 
     According to certain embodiments, the biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 ), for example, the measurement module  400 , may include a flexible printed circuit board  425  extending from the circuit board  423 . A switch member  425   a  or a light-emitting element  425   b  may be mounted on the flexible printed circuit board  425 , and may be electrically connected to the circuit board  423  (e.g., the control unit  201  in  FIG. 2 ). According to an embodiment, the flexible printed circuit board  425  may be mounted on the other surface of the support member  421  (e.g., the surface facing the second case member  401   b  in  FIG. 5 ) and may be disposed such that the switch member  425   a  corresponds to the operation unit  411   a  or such that the light-emitting element  425   b  corresponds to the output unit  411   b . For example, when viewed with reference to the support member  421 , the flexible printed circuit board  425  may be disposed so as to be directed away from the bottom surface of the measurement module  400  (e.g., the outer surface of the first case member  401   a ) and to face the inner surface of the second case member  401   b . According to an embodiment, in the other surface of the support member  421  (e.g., the surface facing the first case member  401   a ), a wiring recess  421   a  having a depth corresponding to the thickness of the flexible printed circuit board  425  (or deeper than the thickness of the flexible printed circuit board  425 ) may be provided. For example, in the state of being mounted on or fixed to the support member  421 , the flexible printed circuit board  425  is capable of being protected from interference with other structures by being located in the wiring recess  421   a.    
     According to certain embodiments, the switch member  425   a  may include a dome switch, a tact switch, or a touch sensor, and may be disposed to correspond to the operation unit  411   a . For example, when the user operates the operation unit  411   a , the switch member  425   a  may generate an on/off signal of the measurement module  400 . According to the setting of the control unit or the memory (e.g., the control unit  201  or the storage unit  233   a  in  FIG. 2 ) of the measurement module  400 , the switch member  425   a  may generate a signal for changing the operation mode of the measurement module  400  or changing the output method of the display unit. In another embodiment, when the measurement module  400  includes a communication module (e.g., the communication unit  235   a  in  FIG. 2 ), the measurement module  400  may transmit data relating to measured or stored biological information, or may reset the operation mode or the communication mode according to the presetting of a processor or the operation of the switch member  425   a.    
     According to certain embodiments, the light-emitting device  425   b  is an example of an output unit that substantially forms the display unit  237   a  in  FIG. 2 , and may visually output the status information of the measurement module  400  or the results of biological signal detection by a combination of a color of light, a blinking signal, and the like. In some embodiments, the light-emitting element  425   b  may be replaced by a display or a sound output unit, or may be installed together with a display or a sound output unit. For example, the measurement module  400  may output operation state information or information on the results of biological signal detection or the like, not only through the color of light or a blinking signal, but also in the form of an image, a character, sound or the like. 
     According to certain embodiments, the second case member  401   b  may be coupled to face the first case member  401   a  in the state in which the support member  421  or the circuit board  423  is accommodated therein. For example, the space in which the circuit board  423  is accommodated may be substantially sealed by the first case member  401   a  and the second case member  401   b . According to an embodiment, when coupling the first case member  401   a  and the second case member  401   b , a fastening member such as a screw is fastened from the first case member  401   a  to sequentially penetrate the circuit board  423  and the support member  421  so as to be bound to the inner surface of the second case member  401   b . According to another embodiment, in the state in which the first case member  401   a  and the second case member  401   b  are coupled to each other, the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  may be positioned to face at least a part of the circuit board  423 . Although not illustrated, the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  may be electrically connected to a circuit device (e.g., the AFE  215  in  FIG. 2 ) provided on the circuit board  423  via elastic bodies such as pogo pins and C-clips. 
     According to certain embodiments, the measurement module  400  is capable of blocking the introduction of foreign matter, moisture, or the like into the inner space (e.g., the inner space of the module housing  301  in  FIG. 3 ) by including a first waterproofing member  419 . For example, the first waterproofing member  419  may have a shape corresponding to the edge of the first case member  401   a  (e.g., an O-ring), and may be interposed between the first case member  401   a  and the second case member  401   b . When the first case member  401   a  and the second case member  401   b  are bound together by the fastening member or the like, the first waterproofing member  419  may form a sealing structure or a waterproofing structure by being pressed to a certain degree between the first case member  401   a  and the second case member  401   b.    
     According to an embodiment, the measurement module  400  may include a permanent magnet (e.g., a permanent magnet  535  in  FIG. 6 ) so as to be coupled to an attachment pad (e.g., the attachment pad  302  in  FIG. 3 ). The arrangement structure, such as a permanent magnet or the like, will be described with reference to  FIG. 6 . 
       FIG. 6  is an exploded perspective view illustrating the arrangement of electrodes  503  in a measurement module of a biological signal measurement device according to certain embodiments. 
     Referring to  FIG. 6 , the measurement module (e.g., the measurement module  400  in  FIG. 6 ) of the biological signal measurement device described above may include a permanent magnet  535  disposed in at least one of the electrodes  503  (e.g., the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  in  FIG. 5 ). In some embodiments, the permanent magnets  535  may be disposed on respective ones of the electrodes  503  (e.g., the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  in  FIG. 5 ). For example, each of the electrodes  503  may include a first electrode plate  533  made of an electrically conductive material and a permanent magnet  535  accommodated in the first electrode plate  533 . In an embodiment, the first electrode plate  533  may include an accommodation recess  533   a  formed in the inner surface thereof and a flange  533   b  provided around the accommodation recess  533   a . For example, the permanent magnet  535  may be received in the accommodation recess  533   a  in the inner surface of the first electrode plate  533 . 
     According to certain embodiments, the first electrode plate  533  may be made of a magnetic substance (e.g., stainless steel), and the permanent magnet  535  may be fixed in the accommodation recess  533   a  even if no separate fixing means is provided. For example, the permanent magnet  535  may be attached or fixed to the first electrode plate  533  or the accommodation recess  533   a  by magnetic force. In another embodiment, the electrode  503  is capable of more stably fixing the permanent magnet  535  in the accommodation recess  533   a  by further including a second electrode plate  537  coupled to the inner surface of the first electrode plate  533 . The second electrode plate  537  may be made of a magnetic substance so as to be coupled to the first electrode plate  533  through the permanent magnet  535 . In some embodiments, the second electrode plate  537  may be substantially directly coupled to the inner surface of the first electrode plate  533  so as to close the accommodation recess  533   a  and to fix the permanent magnet  535 . 
     According to certain embodiments, the electrode(s)  503  may be mounted on the inner surface I of the case member  501  (e.g., the first case member  401   a  in  FIG. 5 ). The case member  501  may include a plurality of first openings  513   a , and stepped surfaces  513   b , which are formed around respective ones of the first openings  513   a , may be formed in the inner surface I thereof. The stepped surfaces  513   b  may be formed to substantially correspond to the flanges  533   b . For example, the electrode(s)  503  may be fixed to the inner surface I of the case member  501  by coupling the flange(s)  533   b  to the stepped surface(s)  513   b . When the electrodes  503 , for example, the first electrode plates  533 , are mounted on or fixed to the stepped surfaces  513   b , the outer surfaces of the first electrode plates  533 , which correspond to the accommodation recesses  533   a , may be exposed to the outer surface of the case member  501  through the first openings  513   a . The region exposed through each first opening  513   a  (e.g., a part of the outer surface of each first electrode plate  533 ) may be substantially coplanar with the outer surface of the case member  501 , or may partially protrude from the outer surface of the case member  501 . 
     According to certain embodiments, a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 4  or the measurement module  400  in  FIG. 5 ) may include first adhesive members  531  that attach the flanges  533   b  to the module housing (e.g., the module housing  301 ), for example, the case member  501 . The first adhesive members  531  may include, for example, a piece of double-sided tape, and may attach the electrodes  503  (e.g., the first electrode plates  533 ) to the first openings  513   a  so as to seal the first openings  513   a  and form waterproofing structures. In an embodiment, the first adhesive members  531  may have a shape corresponding to the flanges  533   b  or the stepped surfaces  513   b , and may substantially attach the flanges  533   b  to the stepped surfaces  513   b.    
     According to certain embodiments, since the permanent magnets  535  are disposed in the electrodes  503 , the structure of the measurement module (e.g., the module housing  301  in  FIG. 3  or the measurement module  400  in  FIG. 5 ) can be simplified or miniaturized. For example, since a separate structure to be coupled with an attachment pad (e.g., the attachment pad  302  of  FIG. 3 ) is substantially unnecessary (e.g., since binding force is provided using the permanent magnet  535 ), it is possible to increase the utilization efficiency of the space inside the measurement module. When the utilization efficiency of the space inside the measurement module increases, it is easy to miniaturize at least the measurement module, and it is possible to dispose a larger-capacity battery in a measurement module of the same size. 
     In a specific embodiment, a structure using magnetic force (e.g., the permanent magnet  535 ) as a method for coupling the measurement module to the attachment pad is disclosed, but the disclosure is not limited thereto. The measurement module may be combined with the attachment pad through, for example, a snap-fit structure using a combination of a hook (or an elastic body) and a recess, a structure in which a lock-releasing button is combined with the snap-fit structure, and a rotational coupling structure (e.g., screw-coupling). As described above, the coupling structure between a measurement module and an attachment pad (e.g., the module housing  301  and the attachment pad  302  in  FIG. 3 ) may be appropriately selected in consideration of the size (e.g., the utilization efficiency of the inner space), shape, or structural stability of a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 ), the alignment direction of a measurement module, and the like. 
       FIG. 7  is a bottom view illustrating a measurement module  600  of a biological signal measurement device according to certain embodiments.  FIG. 8  is a side view illustrating the measurement module  600  of the biological signal measurement device according to certain embodiments. 
     Referring to  FIGS. 7 and 8 , the measurement module  600  (e.g., the module housing  301  in  FIG. 3 ) of the biological signal measurement device according to certain embodiments may include a first electrode  631   a , a second electrode  631   b , a third electrode  631   c , and a fourth electrode  631   d  (e.g., the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  in  FIG. 5 ) exposed to a first surface of the housing  601  (e.g., the outer surface of the first case member illustrated in  FIG. 4  (e.g., the surface directed away from the inner surface I in the first case member  401   a  in  FIG. 4 ), and a first alignment key  633  disposed on the first surface of the housing  601 . 
     According to certain embodiments, a polygon may be formed by combining straight lines drawn to connect two adjacent electrodes among the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d . For example, each of the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  illustrated in  FIG. 7  may be arranged to form one of vertices substantially in the shape of a square. In another embodiment, the first surface of the measurement module  600  is substantially in the shape of a circle and the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  are arranged at equal angular intervals in the circumferential direction of the first surface of the measurement module  600 . 
     As mentioned above, the number and arrangement of the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  may vary. However, considering that the measurement module  600  has a rigid structure and is attached to the user&#39;s body, the area of the measurement module  600  (e.g., the area of the surface on which the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  are disposed) may be limited. Therefore, the number and arrangement of the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  may be appropriately selected in consideration of the area of the portion of the measurement module  600  (or the biological signal measurement device including the measurement module  600 ) that can be stably attached to the user&#39;s body. 
     According to certain embodiments, four electrodes (e.g., the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d ) are disposed, and a pair of arbitrarily selected electrodes may be combined to detect a biological signal. For example, the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  are defined as an RL (Right Leg) electrode (e.g., the fourth electrode  631   d ), an LA (Left Arm) electrode (e.g., the first electrode  631   a ), an RA (Right Arm) electrode (e.g., the second electrode  631   b ), and an LL (Left Leg) electrode (e.g., the third angle corresponding to the third electrode  631   c ), the RL electrode may be utilized as a reference electrode, and each of an LL-RA electrode pair, an RA-LA electrode pair, and an LA-LL electrode pair may form a lead that detects a biological signal. In some embodiments, at least one of the electrode pairs listed above may detect a biological signal. 
     According to certain embodiments, an electronic device (e.g., a processor (e.g., processor  120  of  FIG. 1 ) of the measurement module  600 ) may identify an input or request associated with an electrocardiogram measurement of a living body, may sense a signal using the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  on the basis of the input or request, and may determine the sensed signal as a biological signal associated with the electrocardiogram. The processor of the electronic device may store at least a part or one of determined biological signal(s) in a memory (e.g., the memory  130  of  FIG. 1 ) as at least a piece of measurement information on an electrocardiogram measurement. In some embodiments, at least a piece of the measurement information on an electrocardiogram measurement may be transmitted to another electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ) or stored in a server (the server  108  in  FIG. 1 ) through, for example, a communication module (e.g., the communication module  190  in  FIG. 1  or the communication unit  235   a  in  FIG. 2 ). 
     According to certain embodiments, some of the electrode pairs listed above may detect a biological signal, and the remaining electrode pairs may output a current signal or the like that stimulates the body. The “current signal that stimulates the body” may be provided for a treatment purpose. In another embodiment, when the “current signal that stimulates the body” may interfere with biological signal detection, current signals for biological signal detection and body stimulation may be alternatively or periodically alternately output. 
     In the embodiment, although it is described that “the first electrode, the second electrode, the third electrode, and the fourth electrode of the measurement module detect a biological signal”, it is noted that the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  are substantially a part of a path for transmitting a voltage or current signal corresponding to a detected biological signal. For example, a measurement electrode(s) (e.g., a third wiring electrode  831   c  in  FIG. 12 ) of an attachment pad, which will be described later, actually comes into contact with the user&#39;s body to detect a biological signal, and the measurement electrode may be electrically connected to one of the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d . In another embodiment, the “measurement electrodes” may be interpreted to mean including the first electrode, the second electrode, the third electrode, and the fourth electrode or the third wiring electrode  831   c  of  FIG. 12 , or to mean including a wiring path (e.g., the second wiring electrode  831   b  in  FIG. 12 ) connecting the first electrode, the second electrode, the third electrode, and the fourth electrode and the third wiring electrode  831   c . In the following description, “the electrodes that detect a biological signal” will be described again. However, as described above, an electrode in direct contact with the user&#39;s body and an electrode not in contact with the user&#39;s body may be easily distinguished through the entire description of embodiments, reference drawings, respective embodiments, and the like. 
     According to certain embodiments, the first alignment key  633  may establish a direction for coupling the measurement module  600  to an attachment pad (e.g., the attachment pad  302  in  FIG. 3 ). The first alignment key  633  may have a polygonal shape (e.g., that of an isosceles triangle) that protrudes from a first surface (e.g., the bottom surface) of the measurement module  600  and is directional. The first alignment key  633  may be engaged with a second alignment key (e.g., the alignment recess  325  in  FIG. 3 ) formed on a coupling member. For example, the second alignment key formed on the coupling member may have a shape corresponding to the first alignment key  633 , and the measurement module  600  may be coupled with the coupling member in the direction in which the first alignment key  633  and the second alignment key of the coupling member are engaged with each other. 
     According to certain embodiments, the first alignment key  633  and the corresponding second alignment key may be provided in various shapes and positions. For example, the first alignment key  633  of the measurement module  600  may be formed in a recess shape, and the second alignment key formed on the coupling member may be formed in a protrusion shape. In another embodiment, the first alignment key  633  or the second alignment key may have a right-triangular shape. In another embodiment, when the first surface of the measurement module  600  is a regular polygonal or circular shape, the first alignment key  633  may be positioned at any location other than the center (e.g., a position indicated by “P 1 ”, “P 2 ”, or “P 3 ” on the first surface of the measurement module  600 ). In another embodiment, when each of the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  is connected to any of the third wiring electrodes  831   c  of  FIG. 12 , the first alignment key  633  may have a regular polygonal shape corresponding to the number of the electrodes  631   a ,  631   b ,  631   c ,  631   d . For example, when four electrodes, i.e., the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  are disposed in the measurement module  600  and an electrode (e.g., the fourth electrode  631   d ) is connected to any of the third wiring electrodes among the third wiring electrodes  831   c , the first alignment key  633  may have a square shape. 
       FIG. 9  is an exploded perspective view illustrating a coupling member  701  in an attachment pad of a biological signal measurement device according to certain embodiments.  FIG. 10  is a plan view illustrating the coupling member  701  in the attachment pad of the biological signal measurement device according to certain embodiments.  FIG. 11  is a bottom view illustrating the coupling member  701  in the attachment pad of the biological signal measurement device according to certain embodiments. 
     As described with reference to  FIG. 3 , the coupling member (e.g., the coupling member  323  of  FIG. 3 ) of the biological signal measurement device according to certain embodiments is a part of the attachment pad (e.g., the attachment pad  302  in  FIG. 3 ), and may be mounted on the first surface (e.g., a first surface F 1  in  FIG. 13 ) of the pad body (e.g., the pad body  321  in  FIG. 3 ). Referring to  FIG. 9 , the coupling member  701  (e.g., the coupling member  323  in  FIG. 3 ) may be provided in a shape that encloses a portion of the measurement module (e.g., the module housing  301  in  FIG. 3  or the measurement module  400  in  FIG. 5 ). In an embodiment, the coupling member  701  may include a seating plate  711  and a second waterproofing member  715 . 
     According to certain embodiments, the coupling member  701  may further include first to fourth terminals  731   a  to  731   d , which correspond to respective ones of the first electrode, the second electrode, the third electrode, and the fourth electrode (e.g., the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  in  FIG. 5 ) of the measurement module, and a second adhesive member  721  that attaches the seating plate  711  to the pad body. As will be described later, the first to fourth terminals  731   a  to  731   d  may be electrically connected to a first wiring electrode (e.g., the first wiring electrode  831   a  in  FIG. 12 ) disposed substantially in the pad body, or may be a part of the first wiring electrode. The second adhesive member  721  may include a piece of double-sided tape disposed or attached to a first surface (e.g., the first surface F 1  in  FIG. 13 ) of the pad body. 
     According to certain embodiments, the seating plate  711  has a shape corresponding to at least a portion (e.g., the bottom surface) of the measurement module (e.g., the measurement module  400  in  FIG. 5 ), and may surround at least a part of the side surface of the measurement module by including a fence structure formed at the edge thereof. For example, the seating plate  711  may have a shape that encloses or receives a portion of the measurement module. According to an embodiment, the second waterproofing member  715  is generally in the shape of a closed curve corresponding to the edge of the seating plate  711 , and may be mounted inside a space in which the measurement module is accommodated (e.g., a space formed by a fence structure). For example, when the measurement module is accommodated in the seating plate  711  (or when the measurement module is coupled with the seating plate), the second waterproofing member  715  is capable of blocking the introduction of foreign matter, moisture, or the like between the seating plate  711  and the measurement module (e.g., between the module housing  301  and the coupling member  323  in  FIG. 3 ). 
     According to certain embodiments, second openings  713  may be formed through the seating plate  711  in the space in which the measurement module is accommodated. The second openings  713  may be formed substantially at positions corresponding to the first to fourth electrodes (e.g., the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  in  FIG. 5 ) of the measurement module. In another embodiment, a first alignment hole  733   a  may be formed through the seating plate  711  in the space in which the measurement module is accommodated. The first alignment hole  733   a  may include at least a portion of a second alignment key  733  (e.g., the alignment recess  325  in  FIG. 3 ) corresponding to the first alignment key of the measurement module (e.g., the first alignment key  633  in  FIG. 7 ). 
     According to certain embodiments, the first to fourth terminals  731   a - 731   d  may be disposed in respective ones of the second openings  713 . For example, a plurality of the first to fourth terminals  731   a  to  731   d  may be mounted on the bottom surface of the seating plate  711  to be exposed to the space in which the measurement module is accommodated through the second openings  713 . In an embodiment, the first to fourth terminals  731   a  to  731   d  may be mounted on the seating plate  711  via other adhesive members to close the second openings  713 . For example, the first to fourth terminals  731   a  to  731   d  may be mounted on the seating plate  711  via other adhesive members to form waterproofing structures on the second openings  713 . In another embodiment, when the measurement module (e.g., the measurement module  400  in  FIG. 5 ) is coupled to the coupling member  701 , each of the first to fourth terminals  731   a  to  731   d  may be in electrical contact with one of the electrodes of the measurement module (e.g., the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  in  FIG. 5 ). 
     According to certain embodiments, the first to fourth terminals  731   a  to  731   d  may include a conductive material or a magnetic substance. As described above, each of the first to fourth terminals  731   a  to  731   d  may be made of a conductive material, and may be in electrical contact with one of the electrodes of the measurement module (e.g., the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  in  FIG. 5 ). According to an embodiment, the first to fourth terminals  731   a  to  731   d  may be made of a magnetic material, and may generate an attractive force with the first electrode, the second electrode, the third electrode, and the fourth electrode of the measurement module using the magnetic force of a permanent magnet (e.g., the permanent magnet  535  in  FIG. 6 ). For example, the first to fourth terminals  731   a - 731   d  may couple and fix the measurement module (e.g., the module housing  301  in  FIG. 3  or the measurement module  400  in  FIG. 5 ) to the seating plate  711  using the magnetic force while providing an electrical connection. 
     According to certain embodiments, the second adhesive member  721  may be formed of a piece of double-sided tape or the adhesive applied to the bottom surface of the seating plate  711 . The second adhesive member  721  may attach the seating plate  711  to a pad body (e.g., the pad body  321  in  FIG. 3 ). In an embodiment, the second adhesive member  721  may include a second alignment hole  733   b  aligned with the first alignment hole  733   a . For example, the first alignment hole  733   a  and the second alignment hole  733   b  may be combined to form a second alignment key (e.g., the alignment recess  325  in  FIG. 3 ) corresponding to a first alignment key (e.g., the first alignment key  633  in  FIG. 7 ). In another embodiment, the second adhesive member  721  may be provided on a first surface of the pad body (e.g., the first surface F 1  in  FIG. 13 ) rather than on the seating plate  711 , and in some embodiments, the second adhesive member  721  may be provided on each of the seating plate  711  and the pad body. A pad body in a biological signal measurement device according to certain embodiments will be described with reference to  FIG. 12  and the like. 
       FIG. 12  is an exploded perspective view illustrating a pad body  801  in an attachment pad of a biological signal measurement device according to certain embodiments.  FIG. 13  is a plan view illustrating the pad body  801  in the attachment pad of the biological signal measurement device according to certain embodiments. 
     Referring to  FIGS. 12 and 13 , the pad body  801  of the attachment pad  800  (e.g., the pad body  321  in  FIG. 3 ) may be made of a sheet or the like that can be flexibly deformed to correspond to the bending of the body, and is capable of completing the attachment pad  800  (e.g., attachment pad  302  in  FIG. 3 ) with the coupling member  701  illustrated in  FIG. 9  and the like. In an embodiment, the attachment pad  800  may include an elastic material. It is noted that  FIGS. 12 and 13  illustrate the attachment pad  800  in the state in which the coupling member is omitted. The pad body  801  may include a base sheet  801   a , a plurality of adhesive layers  801   b  and  801   c , a measurement electrode(s), a wiring structure, and the like. 
     According to certain embodiments, the base sheet  801   a  is a flexible sheet that substantially forms the outer shape of the pad body  801 , and is capable of concealing the measurement electrode(s) or the wiring structure so as to prevent the same from being exposed to the outside. In some embodiments, a second adhesive member  821  (e.g., the second adhesive member  721  in  FIG. 9 ) may be provided on the upper surface of the base sheet  801   a  (e.g., the first surface F 1  of the pad body). It has been described that the second adhesive member  821  may be provided on one or each of the coupling member  701  and the pad body  801  of  FIG. 9 . In some embodiments, when the second adhesive member  821  includes a second alignment hole  833  (e.g., the second alignment hole  733   b  in  FIG. 9 ), the second alignment hole  833  may have a recessed shape closed in the direction in which it is attached to the base sheet  801   a . According to an embodiment, the base sheet  801   a  may be made of a single-sided sticker. For example, an adhesive for fixing the wiring structure or the like may be applied to the bottom surface of the base sheet  801   a.    
     According to certain embodiments, the plurality of adhesive layers may include a first adhesive layer  801   b  and a second adhesive layer  801   c . In an embodiment, the first adhesive layer  801   b  may include a piece of double-sided tape directly attached to the bottom surface of the base sheet  801   a . The above-mentioned wiring structure (e.g., a second wiring electrode  831   b  to be described later) and the like may be at least partially fixed between the base sheet  801   a  and the first adhesive layer  801   b . In another embodiment, the second adhesive layer  801   c  may include a pressure-sensitive adhesive applied to the first adhesive layer  801   b , and may directly attach the pad body  801  or a biological signal measurement device (e.g., the biological signal measurement device  300 ) to the user&#39;s body. For example, the second adhesive layer  801   c  may be an adhesive layer to be in direct contact with the user&#39;s body. 
     According to certain embodiments, the pad body  801  may further include a low-adhesion protective film  822 . The low-adhesion protective film  822  is a film attached to the second adhesive layer  801   c  and is capable of preventing pollution of the second adhesive layer  801   c  in the course of manufacturing, circulating or storing the pad body  801  or the attachment pad  800 . For example, when the attachment pad  800  is actually used, the low-adhesion protective film  822  may be removed from the pad body. 
     According to certain embodiments, the pad body  801  may include a coupling portion  811   a  and extension portions  811   b . According to an embodiment, the coupling portion  811   a  means the region in which a coupling member (e.g., the coupling member  701  in  FIG. 9 ) is disposed, and the second adhesive member  821  may be disposed on the coupling portion  811   a . The extension portions  811   b  may extend from the coupling portion  811   a  in different directions, respectively. Each of the extension portions  811   b  may be provided as a region in which one of measurement electrodes (e.g., the third wiring electrodes  831   c  to be described later) is disposed. For example, the extension portions  811   b  are capable of improving accuracy or the like in biological signal detection by securing an interval between the measurement electrodes. 
     According to certain embodiments, the wiring structure may include first wiring electrodes  831   a  and second wiring electrodes  831   b , and is capable of electrically connecting the measurement electrode(s) (e.g., a third wiring electrode  831   c  to be described later) to a measurement module (e.g., the measurement module  400  in  FIG. 5 ). According to an embodiment, the first wiring electrodes  831   a  may be disposed in the through holes formed in the base sheet  801   a  or the second adhesive member  821 , and may be in electrical contact with or may be attached to terminals (e.g., the first to fourth terminals  731   a  to  731   d  in  FIG. 9 ). For example, the second electrodes  831   c  may have a double-sided tape structure (e.g., adhesiveness) and may be conductive. For example, the first wiring electrodes  831   a  may be disposed in the coupling portion  811   a . As described above, each of the first wiring electrodes  831   a  may be a portion of one of the above-mentioned first to fourth terminals (e.g., the first to fourth terminals  731   a  to  731   d  in  FIG. 9 ), or each of the first to fourth wiring terminals may be provided on a portion of one of the first wiring electrodes  831   a . According to another embodiment, the second wiring electrodes  831   b  may be made of silver or silver chloride and may have conductivity and a certain degree of flexibility. The second wiring electrodes  831   b  may extend from respective ones of the first wiring electrodes  831   a . In some embodiments, one end of some of plurality of the second wiring electrodes  831   b  may be positioned on one of the extension portions  811   b , and one end of the other of the plurality of the second wiring electrodes  831   b  may be positioned on the coupling portion  811   a . According to an embodiment, at least a part of the wiring structure, for example, the third wiring electrodes  831   c , may be disposed between the base sheet  801   a  and the first adhesive layer  801   b.    
     According to certain embodiments, when the measurement module (e.g., the measurement module  400  in  FIG. 5 ) includes four electrodes, such as the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d , three extension portions  811   b  may be provided. The number of first wiring electrodes  831   a  or third wiring electrodes  831   c  may correspond to the number of first to fourth electrodes of the measurement module (e.g., the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  in  FIG. 5 ). According to an embodiment, some of the second wiring electrodes  831   b  may extend from any one of the first wiring electrodes  831   a  in the coupling portion  811   a , and the end of each of the second wiring electrodes  831   b  may be positioned on one of the extension portions  811   b . The third wiring electrodes  831   c , each having an end positioned on one of the extension portions  811   b , may be connected to the LL (Left Leg) electrode, the RA (Right Arm) electrode, and the LA (Left Arm) electrode, which form a measurement lead, among the first electrode, the second electrode, the third electrode, and the fourth electrode of the measurement module (e.g., the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  in  FIG. 7 ). For example, the second wiring electrodes  831   b  (e.g., the measurement electrodes), each having an end positioned on one of the extension portions  811   b , is capable of transmitting a substantially detected biological signal or a voltage or current signal corresponding to the detected biological signal. According to another embodiment, any one of the second wiring electrodes  831   b  may extend from one of the first wiring electrodes  831   a , and an end of the second wiring electrode  831   b  may be positioned in the coupling portion  811   a . For example, any one of the third wiring electrodes  831   c  may be positioned in the coupling portion  811   a , and may be connected to the reference electrode (e.g., the fourth electrode  631   d  or the RL electrode in  FIG. 7 ) among the first electrode, the second electrode, the third electrode, and the fourth electrode of the measurement module. In an embodiment, the end of the second wiring electrode  831   b  connected to the reference electrode or the third wiring electrode  831   c  connected to the reference electrode may be positioned in the center of the coupling portion  811   a.    
     According to certain embodiments, the measurement electrode(s) provided in the pad body  801  may include the third wiring electrodes  831   c , which are respectively provided at the ends of the second wiring electrodes  831   b . The third wiring electrodes  831   c  may be exposed to the outside on a second surface directed away from the first surface F 1  of the pad body  801  (e.g., on the second adhesive layer  801   c ). For example, the third wiring electrodes  831   c  may be exposed to the outside of the attachment pad  800  or the pad body  801  in a direction different from that of the first terminal  731   a , the second terminal  731   b , the third terminal  731   c , or the fourth terminal  731   d  (e.g., the opposite direction) in  FIG. 10 . 
     According to certain embodiments, when the second adhesive layer  801   c  is attached to the user&#39;s body (skin), the third wiring electrode(s)  831   c  may be in direct contact with the user&#39;s body. The third wiring electrode(s)  831   c  may be made of a conductive hydrogel and may stably maintain contact with the user&#39;s body. In an embodiment, a biological signal may be detected by the third wiring electrode(s)  831   c  and may be transmitted to a measurement module (e.g., the first electrode  431   a , the second electrode  431   b , the third electrode  431   c , and the fourth electrode  431   d  in  FIG. 5 ) via the second wiring electrode(s)  831   b  and the first wiring electrode(s)  831   a  (or the first to fourth terminals  731   a  to  731   d  in  FIG. 9 ). 
     According to certain embodiments, since the third wiring electrodes  831   c  are disposed on respective ones of the extension portions  811   b , the third wiring electrodes  831   c  may be arranged with a larger interval therebetween than the first wiring electrodes  831   a  located in the coupling portion  811   a  or the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  of  FIG. 7 . For example, the attachment pad  800  is capable of securing sufficient space between the measurement electrodes (e.g., the third wiring electrodes  831   c ) so as to create an environment capable of stably detecting a biological signal. In an embodiment, any one of the third wiring electrodes  831   c  may be located in the center of the coupling portion  811   a . For example, any one of the third wiring electrodes  831   c  may be disposed on an end of the second wiring electrode located in the coupling portion  811   a  among the second wiring electrodes  831   b  and may be electrically connected to the reference electrode of the measurement module (e.g., the RL electrode in  FIG. 7 ). In contact with the body of a user or a patient, a measurement electrode (e.g., one of the third wiring electrodes  831   c ) connected to the reference electrode (e.g., the fourth electrode  631   d  in  FIG. 7 ) may be disposed at the same interval with respect to the remaining third wiring electrodes. 
       FIG. 14  illustrates various shapes of an attachment pad  900  of a biological signal measurement device according to certain embodiments. 
     Referring to  FIG. 14 , the shapes of the attachment pad(s)  900  (e.g., the attachment pad  800  in  FIG. 13 ), for example, the extension directions or lengths of the extension portions (e.g., the extension portions  811   b  in  FIG. 13 ), may be various. In an embodiment, an attachment pad(s) having a shape substantially based on a regular triangle may be attached to a portion in which the bending of the body is slight. In another embodiment, in a portion to which the attachment pad(s) having a shape based on a regular triangle is difficult to stably attach (e.g., in a valley portion between the breasts or a portion below a rib), an attachment pad having a shape generally based on the letter “T” or “Y” may be easily attached. In the attachment pads having various shapes as described above, the structure of the coupling portion  911   a  may be substantially the same as the coupling member  701  in  FIG. 9  or the coupling portion  811   a  in  FIG. 13 . For example, even if the shapes of the attachment pads  900  are different, the attachment pads may be coupled to a measurement device (e.g., the measurement module  400  in  FIG. 5 ) so as to implement a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 ). 
     According to certain embodiments, the attachment pad(s) may include at least one slit  911  so as to be stably attached to a bending portion of a body. For example, the slit(s)  911  may improve the flexibility of the attachment pad(s)  900 . In some embodiments, the area of the attachment pad  900  (e.g., the pad body  801  in  FIG. 13 ) may be reduced so as to improve the flexibility of the attachment pad. For example, as in the attachment pad indicated by reference numeral “ 901 ”, extension portions (e.g., the extension portion  811   b  in  FIG. 13 ) may be formed to have a minimum area or a shape in which a third electrode or a fourth electrode (e.g., the second wiring electrode  831   b  or the third wiring electrode  831   c  in  FIG. 12 ) may be disposed. In another embodiment, it is possible to improve the flexibility of the attachment pad by partially removing unnecessary portions of the pad body (e.g., the pad body  801  in  FIG. 13 ). For example, as in the attachment pad indicated by reference numeral “ 902 ”, a flexible attachment pad having a regular triangle shape in appearance may be formed by partially removing the pad body in a region in which the wiring structure (e.g., the second wiring electrode  831   b  or the third wiring electrode  831   c  in  FIG. 12 ) is not disposed. 
     As described above, according to certain embodiments, in the biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 ), it is possible to miniaturize a rigid module housing or measurement module (e.g., the measurement module  400  in  FIG. 5 ) and to dispose measurement electrodes (the third wiring electrodes  831   c  in  FIG. 12 ) on an attachment pad, which is flexible (or easily attachable to the user&#39;s body) (e.g., the attachment pad  800  in  FIG. 12 ). For example, due to the flexibility of the attachment pad, it is easy to attach the attachment pad to a bent body part, and it is possible to secure a sufficient gap between the measurement electrodes. A module housing or a measurement module having a circuit device or the like therein may be electrically connected to the measurement electrodes via a wiring structure embedded in the attachment pad. According to an embodiment, the module housing or measurement module is capable of maintaining a stable coupling state with the attachment pad by magnetic force, and replacement of the attachment pad may be facilitated. This magnetic force is generated by an electrode (e.g., the electrode  503  in  FIG. 6 ) provided in the module housing or measurement module and an electrode (e.g., the first to fourth terminals  731   a  to  731   d  in  FIG. 9 ) provided in the attachment pad. According to another embodiment, the number of measurement electrodes may be four. For example, a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 ) may include one reference electrode and at least three measurement electrodes, in which two arbitrarily selected electrodes among three measurement electrodes may be paired (or may form a lead) so as to detect a biological signal. When the number of measurement electrodes is three, three electrode pairs, each including two arbitrarily selected electrodes, may be formed. For example, one biological signal measurement device is capable of measuring a biological signal through three leads, and as the number of leads (e.g., electrode pairs) capable of measuring a biological signal is increased, accuracy in measurement can be improved 
       FIG. 15  is a perspective view of the front surface of the electronic device  104  according to certain embodiments.  FIG. 16  is a perspective view of the rear surface of the electronic device  104  according to certain embodiments. 
     Referring to  FIGS. 15 and 16 , the electronic device  104  according to an embodiment may include a housing  1310  including: a first surface (or a front surface)  1310 A; a second surface (or a rear surface)  1310 B; and a side surface (e.g. the side surface  1310 C in  FIG. 15 or 16 ) surrounding the space between the first surface  1310 A and the second surface  1310 B. In another embodiment (not shown), the housing  1310  may refer to a structure forming some of the first surface (e.g. the first surface  1310 A in  FIG. 15 ), the second surface (e.g. the second surface  1310 B in  FIG. 16 ), and the side surface  1310 C in  FIG. 15 . According to an embodiment, the first surface  1310 A may be formed of a front plate  1302  (e.g. a glass plate including various coating layers, or a polymer plate), at least a part of which is substantially transparent. The second surface  1310 B may be formed of a substantially opaque rear plate  1311 . The rear plate  1311  may be formed of, for example, coated or colored glass, ceramic, polymer, metal (e.g. aluminum, stainless steel (STS), or magnesium), or a combination of at least two of the above-described materials. The side surface  1310 C is coupled to the front plate  1302  and the rear plate  1311 , and may be formed of a side bezel structure (or “a side member”)  1318  which contains metal and/or polymer. In an embodiment, the rear plate  1311  and the side bezel structure  1318  may be integrally formed and may contain the same material (e.g. a metal material such as aluminum). 
     In an illustrated embodiment, the front plate  1302  may include two first regions  1310 D which are provided at both ends of the long edge of the front plate  1302  and are bent or seamlessly extend from the first surface  1310 A to the rear plate  1311 . In an illustrated embodiment (see  FIG. 16 ), the rear plate  1311  may include two second regions  1310 E which are provided at both ends of the long edge thereof and are bent or seamlessly extend from the second surface  1310 B to the front plate  1302 . In an embodiment, the front plate  1302  (or the rear plate  1311 ) may include one of the first regions  1310 D (or the second regions  1310 E) (e.g., to the exclusion of the other). In another embodiment, some of the first regions  1310 D or second regions  1310 E may not be included. The above-described embodiments, when the electronic device  104  is seen from the side thereof, the side bezel structure  1318  may have a first thickness (width) at a side surface which does not include the first regions  1310 D or second regions  1310 E, and may have a second thickness, which is smaller than the first thickness, at a side surface including the first regions  1310 D or the second regions  1310 E. 
     According to an embodiment, the electronic device  104  may include at least one among: a display  1301 ; audio modules  1303 ,  1307 , and  1314 ; sensor modules  1316  and  1319 ; camera modules  1305 ,  1312 , and  1313 ; a key input device  1317 ; and connector holes  1308  and  1309 . In an embodiment, in the electronic device  104 , at least one (e.g. the key input device  1317 ) of the elements may be omitted or another element may be additionally included. 
     The display  1301  may be exposed through, for example, a considerable portion of the front plate  1302 . In an embodiment, the display  1301  may be at least partially exposed through the front plate  1302  which the first surface  1310 A and a first region  1310 D of the side surface  1310 C. In an embodiment, the edge of the display  1301  may be formed to have a shape identical to the shape of an outer edge of the front plate  1302  adjacent thereto. In another embodiment (not shown), in order to increase an exposed area of the display  1301 , the gaps between the outer edges of the display  1301  and the outer edges of the front plate  1302  may be formed to be approximately equal to each other. 
     In another embodiment, a recess or an opening is formed in a part of the screen display region of the display  1301 , and the electronic device may include at least one of the camera module  1305  and a sensor module (not shown) aligned with the recess or the opening. In another embodiment (not shown), at least one of the audio module  1314 , the sensor module (not shown), the camera module  1305 , the fingerprint sensor  1316 , and the light-emitting diode (not shown) may be included on the rear surface of the screen display region of the display  1301 . In another embodiment (not shown), the display  1301  may be coupled to or disposed adjacent to a touch sensing circuit, a pressure sensor capable of measuring the strength (pressure) of touch, and/or a digitizer for detecting a stylus pens using a magnetic field. In an embodiment, at least a part of the sensor modules  1319  and/or at least a part of the key input device  1317  may be disposed in the first regions  1310 D, and/or the second regions  1310 E. 
     The audio modules  1303 ,  1307 , and  1314  may include a microphone hole and speaker holes. A microphone for acquiring external sound may be disposed in the microphone hole, and, in an embodiment, multiple microphones may be disposed so as to sense the direction of sound. The speaker holes may include an outer speaker hole and a calling receiver hole. In an embodiment, the speaker holes and the microphone hole may be implemented as one hole, or a speaker (e.g. a Piezo speaker) may be included without the speaker holes. 
     The sensor modules  1316  and  1319  may generate an electrical signal or a data value, which corresponds to an operation state inside the electronic device  104  or an environment state outside the electronic device  104 . The sensor modules  1316  and  1319  may include, for example, a first sensor module (e.g. a proximity sensor) and/or a second sensor module (not shown) (e.g. a fingerprint sensor), disposed on the first surface  1310 A of the housing  1310 , and/or a third sensor module  1319  (e.g. an HRM sensor) and/or a fourth sensor module  1316  (e.g., a fingerprint sensor), disposed on the second surface  1310 B of the housing  1310 . The fingerprint sensor may be disposed not only on the first surface  1310 A (e.g. the display  1301 ) of the housing  1310  but also on the second surface  1310 B thereof. The electronic device  104  may further include at least one of an unillustrated sensor module, for example, a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. 
     The camera modules  1305 ,  1312 , and  1313  may include: a first camera module  1305  disposed on the first surface  1310 A of the electronic device  104 ; and a second camera module  1312  and/or a flash  1313 , disposed on the second surface  1310 B. Each of the camera modules  1305  and  1312  may include one or multiple lenses, an image sensor, and/or an image signal processor. The flash  1313  may include, for example, a light-emitting diode or a xenon lamp. In an embodiment, two or more lenses (an infrared camera, wide-angle and telephoto lenses) and image sensors may be disposed on one surface of the electronic device  104 . 
     The connector holes  1308  and  1309  may include: a first connector hole  1308  capable of receiving a connector (e.g. a USB connector) for transmitting or receiving power and/or data to or from an external electronic device; and/or a second connector hole (e.g. an earphone jack)  1309  capable of receiving a connector for transmitting or receiving an audio signal to or from an external electronic device. 
       FIG. 17  is an exploded perspective view of an electronic device  104  according to certain embodiments. 
     Referring to  FIG. 17 , the electronic device  104  (e.g., the electronic device  104  in  FIG. 15 or 16 ) may include: a side bezel structure  1331 ; a first support member  1332  (e.g., a bracket); a front plate  1320 ; a display  1330 ; a printed circuit board  1340 ; a battery  1350 ; a second support member  1360  (e.g., rear case); an antenna  1370 ; and rear plate  1380 . In an embodiment, in the electronic device  104 , at least one (e.g., the first support member  1332  or the second support member  1360 ) of the elements may be omitted, or another element may be additionally included. At least one of the elements of the electronic device  104  may be the same as or similar to at least one of the elements of the electronic device  104  in  FIG. 15 or 16 . Thus, hereinafter, a redundant description will be omitted. 
     The first support member  1332  may be disposed inside the electronic device  104  and connected to the side bezel structure  1331 , or may be formed integrally with the side bezel structure  1331 . The first support member  1332  may be formed of, for example, a metal material and/or non-metal (e.g. polymer) material. The first support member  1332  may have one surface to which the display  1330  is coupled, and another surface to which the printed circuit board  1340  is coupled. A processor, a memory, and/or an interface may be mounted on printed circuit board  1340 . The processor may include at least one of, for example, a central processing unit, an application processor, a graphics-processing unit, an image signal processor, a sensor hub processor, or a communication processor. 
     The memory may include, for example, volatile memory or nonvolatile memory. 
     The interface may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, and/or an audio interface. The interface may electrically or physically connect the electronic device  104  to an external electronic device, and may include a USB connector, an SD card/MMC connector, or an audio connector. 
     The battery  1350  is a device for supplying power to at least one element of the electronic device  104 , and may include, for example, an non-rechargeable primary battery a rechargeable secondary battery, or a fuel cell. At least a part of the battery  1350  may be disposed, for example, on substantially the same plane together with the printed circuit board  1340 . The battery  1350  may be integrally disposed inside the electronic device  104  and may be detachably disposed in the electronic device  104 . 
     The antenna  1370  may be disposed between the rear plate  1380  and the battery  1350 . The antenna  1370  may include, for example, a near field communication (NFC) antenna, a wireless charging antenna, and/or a magnetic secure transmission (MST) antenna. For example, the antenna  1370  may perform short-range communication with an external device, or may transmit or receiving power utilized for charging to or from the external device in a wireless manner. In another embodiment, an antenna structure may be formed by a part of the side bezel structure  1331  and/or the first support member  1332  or a combination thereof. 
     According to certain embodiments, the electronic device may include multiple communication devices (not shown). For example, some of the multiple communication devices (not shown) may be implemented to transmit or receive radio waves having different characteristics (tentatively referred to as electric waves of A and B frequency bands) in order to implement MIMO. As another example, some of the multiple communication devices (not shown) may be configured to simultaneously transmit or receive radio waves having the same characteristics (tentatively referred to as radio waves of A1 and A2 frequencies in the A frequency band) in order to implement diversity. As another example, others of the multiple communication devices (not shown) may be configured to simultaneously transmit or receive radio waves having the same characteristics (tentatively referred to as radio waves of B1 and B2 frequencies in the B frequency band) in order to implement diversity. In an embodiment, two communication devices may be included, but, in another embodiment, the electronic device  104  may include four communication devices to simultaneously implement MIMO and diversity. In another embodiment, the electronic device  104  may include one communication device (not shown) (e.g., to the exclusion of another). 
     According to an embodiment, when one communication device is disposed at a first position of the printed circuit board  1340  in consideration of transmission and reception characteristics of radio waves, another communication device may be disposed at a second position separated from the first position of the printed circuit board  1340 . As another example, one communication device and another communication device may be disposed in consideration of the separation distance between each other according to diversity characteristics. 
     According to an embodiment, at least one communication device (not shown) may include a wireless communication circuit that processes radio waves transmitted and received in an ultra-high frequency band (e.g., 6 GHz to 300 GHz). Radiating conductor(s) of the at least one communication device (not shown) may include, for example, a patch-type radiating conductor or a dipole-shaped radiating conductor extending in one direction. The multiple radiating conductors may be arrayed to form an antenna array. A chip (e.g., an integrated circuit chip) on which a part of the wireless communication circuit is implemented may be disposed on one side of a region where the radiation conductor is disposed or on a surface facing a direction opposite to that of the surface on which the radiation conductor is disposed. For example, the chip may be electrically connected to the radiation conductor (s) through a wiring formed as a printed circuit pattern. 
       FIG. 18  illustrates a biological signal measurement device attached to a user according to certain embodiments.  FIG. 19A  illustrates a biological signal generated based on a signal sensed using an electronic device according to certain embodiments, and  FIG. 19B  illustrates a biological signal generated based on a signal sensed using an electronic device according to certain embodiments.  FIG. 20  is a view for describing a preconfigured biological signal according to certain embodiments. 
     According to  FIGS. 18, 19A, 19B, and 20 , the biological signal measurement device  300  may include a (3-1)th wiring electrode e 1 , a (3-2)th wiring electrode e 2 , a (3-3)th wiring electrode e 3 , and a (3-4)th wiring electrode e 4 . The configuration of the (3-1)th wiring electrode e 1 , the (3-2)th wiring electrode e 2 , the (3-3)th wiring electrode e 3 , and the (3-4)th wiring electrode e 4  may be partially or totally identical to the configuration of the third wiring electrodes  831 C in  FIG. 12 . The (3-1)th wiring electrode e 1  may be electrically connected to the first electrode  631   a  in  FIG. 8 , the (3-2)th wiring electrode e 2  may be electrically connected to the second electrode  631   b  in  FIG. 8 , the (3-3)th wiring electrode e 3  may be electrically connected to the third electrode  631   c  in, and the (3-4)th wiring electrode e 4  may be electrically connected to the fourth electrode  631   d.    
     According to  FIG. 18 , the biological signal measurement device  300  may include a first pad body  321   a , a second pad body  321   b , and a third pad body  321   c . The first pad body  321   a , the second pad body  321   b , and the third pad body  321   c  in  FIG. 18  are parts of the pad body  321  in  FIG. 3 , and may be at least partially identical or similar to the pad body  801  of  FIG. 12 . 
     According to certain embodiments, the biological signal measurement device  300  attached to the body of a user may sense a first signal, a second signal, and a third signal. According to an embodiment, a processor (e.g., the processor  120  in  FIG. 1 ) may sense an electrical signal generated from the electrical activity of the user&#39;s heart by using the (3-1)th wiring electrode e 1 , the (3-2)th wiring electrode e 2 , the (3-3)th wiring electrode e 3 , and the (3-4)th wiring electrode e 4 . For example, the processor  120  may sense the first signal by using the (3-1)th wiring electrode e 1  and the (3-4)th wiring electrode e 4  (e.g., a reference electrode), may sense the second signal by using the (3-2)th wiring electrode e 2  and the (3-4)th wiring electrode e 4 , and may sense the third signal by using the (3-3)th wiring electrode e 3  and the (3-4)th wiring electrode e 4 . 
     According to certain embodiments, the processor  120  may measure impedance for at least one of a first electrical path, a second electrical path, a third electrical path, or a fourth electrical path. The first electrical path may be formed by the first electrode  631   a , the first terminal  731   a , the first wiring electrode  831   a , the second wiring electrode  831   b , and the third wiring electrode  831   c . The second electrical path may be formed by the second electrode  631   b , the second terminal  731   b , the first wiring electrode  831   a , the second wiring electrode  831   b , and the third wiring electrode  831   c . The third electrical path may be formed by the third electrode  631   c , the third terminal  731   c , the first wiring electrode  831   a , the second wiring electrode  831   b , and the third wiring electrode  831   c . The fourth electrical path may be formed by the fourth electrode  631   d , the fourth terminal  731   d , the first wiring electrode  831   a , the second wiring electrode  831   b , and the third wiring electrode  831   c . According to an embodiment, the processor  120  may measure impedance for at least one of the (3-1)th wiring electrode e 1 , the (3-2)th wiring electrode e 2 , the (3-3)th wiring electrode e 3 , or the (3-4)th wiring electrode e 4 . According to another embodiment, the processor  120  may measure impedance for at least one of the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d . The processor  120  may determine, based on the measured impedance, whether the biological signal measurement device  300  has been attached to the user&#39;s body. 
     According to certain embodiments, an attachment pad  321  may include a first attachment pad region  321   a , a second attachment pad region  321   b , a third attachment pad region  321   c , and a fourth attachment pad region  321   d . The first attachment pad region  321   a , the second attachment pad region  321   b , and the third attachment pad region  321   c  may be formed in shapes which extend in different directions from the fourth attachment pad region  321   d  of the attachment pad  321 , respectively. 
     According to certain embodiments, the (3-1)th wiring electrode e 1 , the (3-2)th wiring electrode e 2 , the (3-3)th wiring electrode e 3 , and the (3-4)th wiring electrode e 4  may be disposed in consideration of the separation distance between each other. For example, the (3-1)th wiring electrode e 1  may be disposed in the first attachment pad region  321   a , the (3-2)th wiring electrode e 2  may be disposed in the second attachment pad region  321   b , the (3-3)th wiring electrode e 3  may be disposed in the third attachment pad region  321   c , and the (3-4)th wiring electrode e 4  may be disposed in the fourth attachment pad region  321   d.    
     According to certain embodiments, at least one of the first attachment pad region  321   a , the second attachment pad region  321   b , or the third attachment pad region  321   c  may be formed in various structures in order to induce a user to attach the biological signal measurement device  300  at an accurate position. According to an embodiment, each of the first attachment pad region  321   a , the second attachment pad region  321   b , and the third attachment pad region  321   c  may include a light source (e.g., a light-emitting diode (LED)). A first light source disposed in the first attachment pad region  321   a , a second light source disposed in the second attachment pad region  321   b , and a third light source disposed in the third attachment pad region  321   c  may provide a user with different colors of light, different shapes of light, or different blinking periods of light in order to provide the user with a position at which the biological signal measurement device  300  is to be disposed. According to another embodiment, the first attachment pad region  321   a , the second attachment pad region  321   b , and the third attachment pad region  321   c  may be formed in different colors so as to provide the user with the position at which the biological signal measurement device  300  is to be disposed. According to another embodiment, at least one of the first attachment pad region  321   a , the second attachment pad region  321   b , or the third attachment pad region  321   c  may include letters for providing the user with the position at which the biological signal measurement device  300  is to be disposed. For example, letters (e.g., LA) indicating a left arm may be positioned in the first attachment pad region  321   a , and letters (e.g., RA) indicating a right arm may be positioned in the second attachment pad region  321   b.    
     According to certain embodiments, biological signals may be acquired using the biological signal measurement device  300 . According to an embodiment, the biological signal measurement device  300  may generate a first biological signal, a second biological signal, and a third biological signal, based the first signal, the second signal, and the third signal, which have been sensed. According to another embodiment, another electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ), connected to the biological signal measurement device  300  via a direct (e.g., wired) communication channel or a wireless communication channel, may receive the first signal, the second signal, and the third signal, which have been sensed by the biological signal measurement device  300 , from the biological signal measurement device  300 , and may generate the first biological signal, the second biological signal, and the third biological signal, based on the first signal, the second signal, and the third signal which have been received. Multiple biological signals are acquired using one biological signal measurement device  300 , and thus the accuracy of the biological signals may be increased. Further, according to another embodiment, the electronic device  104  may receive a biological signal from the biological signal measurement device  300 . 
     According to certain embodiments, biological signals including the first biological signal, the second biological signal, and the third biological signal may be generated based on the first signal, the second signal, and the third signal. For example, the first biological signal may be generated based on the first signal and the second signal, the second biological signal may be generated based on the second signal and the third signal, and the third biological signal may be generated based on the third signal and the first signal. 
     According to certain embodiments, the (3-4)th wiring electrode e 4  may be provided as a reference electrode for the (3-1)th wiring electrode e 1 , the (3-2)th wiring electrode e 2 , or the (3-3)th wiring electrode e 3 , and the first biological signal may be substantially determined by the comparison between or a combination of signals sensed using the (3-1)th wiring electrode e 1  and the (3-2)th wiring electrode e 2 , based on the electric potential of the (3-4)th wiring electrode e 4 . According to an embodiment, the first biological signal may be determined based on a signal (signals) sensed using a lead or an electrode pair including the (3-1)th wiring electrode e 1  and the (3-2)th wiring electrode e 2 . According to another embodiment, the second biological signal may be determined based on a signal (signals) sensed using a lead or an electrode pair including the (3-2)th wiring electrode e 2  and the (3-3)th wiring electrode e 3 . Further, according to another embodiment, the third biological signal may be determined based on a signal (signals) sensed using a lead or an electrode including the (3-3)th wiring electrode e 3  and the (3-1)th wiring electrode e 1 . 
     According to certain embodiments, a biological signal may include information on a user&#39;s condition. For example, a biological signal may include at least one of a heart rate, a heart rhythm, an electrocardiogram (ECG), a photoplethysmography (PPG), a blood pressure, a blood-oxygen saturation level, a respiratory rate, a blood sugar level, or a body temperature. According to an embodiment, the biological signal may be defined as a signal including information related to an electrocardiogram. For example, the biological signal may include information on at least one of QRS waves (QRS-complex), PR segment, ST segment, P-R interval, QT interval, and voltage amplitude. 
     According to certain embodiments, whether the biological signal measurement device  300  is normally attached to a user&#39;s body may be determined based on a biological signal. For example, a biological signal may be compared with a preconfigured biological signal (PBS), and whether the biological signal measurement device  300  has been normally attached to the user&#39;s body may be determined. According to an embodiment, when the first biological signal is determined to be a noise biological signal, which is not a normal biological signal, through the comparison between the first biological signal and the preconfigured biological signal (PBS), it may be determined that at least one of the (3-1)th wiring electrode e 1 , the (3-2)th wiring electrode e 2 , or the (3-4)th wiring electrode e 4 , used to generate the first biological signal, is not normally attached to the body. According to another embodiment, when the second biological signal is determined to be a noise biological signal, which is not a normal biological signal, through the comparison between the second biological signal and the preconfigured biological signal (PBS), it may be determined that at least one of the (3-2)th wiring electrode e 2 , the third electrode e 2 , or the (3-4)th wiring electrode e 4 , used to generate the second biological signal, is not normally attached to the body. Further, according to another embodiment, when the third biological signal is determined to be a noise biological signal, which is not a normal biological signal, through the comparison between the third biological signal and the preconfigured biological signal (PBS), it may be determined that at least one of the (3-3)th wiring electrode e 3 , the (3-1)th wiring electrode e 1 , or the (3-4)th wiring electrode e 4 , used to generate the third biological signal, is not normally attached to the body. The normal biological signal may be defined as a biological signal generated when an electrode is normally attached to the body (e.g.,  FIG. 19A ). For example, the normal biological signal may be defined as a biological signal having a range in which an acquired biological signal corresponds to the preconfigured biological signal (PBS). The noise biological signal may be a biological signal generated when an electrode is not normally attached to the body (e.g.,  FIG. 19B ). For example, the noise biological signal may be a biological signal having a range in which an acquired biological signal does not correspond to the preconfigured biological signal (PBS). 
     According to an embodiment, the processor (e.g., the processor  120  in  FIG. 1 ) of the biological signal measurement device  300  may determine whether the biological signal measurement device  300  has been normally attached to a user&#39;s body. According to another embodiment, another electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ), connected to the biological signal measurement device  300  via a direct (e.g., wired) communication channel or a wireless communication channel, may determine whether the biological signal measurement device  300  is attached to the user&#39;s body, based on the first signal, the second signal, and the third signal which have been received from the biological signal measurement device  300 . 
     According to certain embodiments, whether the biological signal measurement device  300  is normally attached to the user&#39;s body may be determined using various methods. According to an embodiment, whether at least one of the (3-1)th wiring electrode e 1 , the (3-2)th wiring electrode e 2 , or the (3-4)th wiring electrode e 4 , used to generate the first biological signal, is normally attached to the user&#39;s body may be determined by comparing at least one of the QRS waves (QRS-complex), PR segment, ST segment, P-R interval, QT interval, and voltage (V) of the first biological signal with at least one of the QRS waves (QRS-complex), PR segment, ST segment, P-R interval, QT interval, and voltage (V) of the preconfigured biological signal (PBS). According to another embodiment, whether at least one of the (3-2)th wiring electrode e 2 , the (3-3)th wiring electrode e 3 , or the (3-4)th wiring electrode e 4 , used to generate the second biological signal, is normally attached to the user&#39;s body may be determined by comparing at least one of the QRS waves (QRS-complex), PR segment, ST segment, P-R interval, QT interval, and voltage (V) of the second biological signal with at least one of the QRS waves (QRS-complex), PR segment, ST segment, P-R interval, QT interval, and voltage (V) of the preconfigured biological signal (PBS). Further, according to another embodiment, whether at least one of the (3-3)th wiring electrode e 3 , the (3-1)th wiring electrode e 1 , or the (3-4)th wiring electrode e 4 , used to generate the second biological signal, is normally attached to the user&#39;s body may be determined by comparing at least one of the QRS waves (QRS-complex), PR segment, ST segment, P-R interval, QT interval, and voltage (V) of the third biological signal with at least one of the QRS waves (QRS-complex), PR segment, ST segment, P-R interval, QT interval, and voltage (V) of the preconfigured biological signal (PBS). 
       FIG. 21A  illustrates a biological signal changed based on the position of an electronic device according to certain embodiments.  FIG. 21B  illustrates a biological signal changed based on the position of an electronic device according to certain embodiments.  FIG. 21C  illustrates a biological signal changed based on the position of an electronic device according to certain embodiments.  FIG. 21D  illustrates a biological signal changed based on the position of an electronic device according to certain embodiments. 
     According to  FIGS. 21A, 21B, 21C, and 21D , guide information for guiding the position of the biological signal measurement device  300  may be generated based on the first biological signal, the second biological signal, and the third biological signal. The guide information is defined as information including the position to which the biological signal measurement device  300  is to be moved in order to acquire a normal biological signal by using the biological signal measurement device  300 . For example, the guide information may be information for moving the biological signal measurement device  300  to a position adjacent to the user&#39;s heart. 
     According to certain embodiments, the guide information may be generated based on the first biological signal, a second biological signal, and the third biological signal. For example, the guide information may be generated based on whether at least one of the first biological signal, the second biological signal, or the third biological signal is within the range of the preconfigured biological signal (PBS). 
     According to an embodiment, the processor (e.g., the processor  120  in  FIG. 1 ) of the biological signal measurement device  300  may generate the guide information based on the first biological signal, the second biological signal, and the third biological signal. According to another embodiment, another electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ), connected to the biological signal measurement device  300  via a direct (e.g., wired) communication channel or a wireless communication channel, may generate the guide information based on the first biological signal, the second biological signal, and the third biological signal. 
     According to certain embodiments, the guide information may be generated by a combination of the first biological signal, the second biological signal, and the third biological signal. 
     According to  FIG. 21A , when the first biological signal, the second biological signal, and the third biological signal are all noise biological signals, the biological signal measurement device  300  or the electronic device  104  may generate guide information including information for attaching the biological signal measurement device  300  to another position. 
     According to  FIG. 21B , when two biological signals among the first biological signal, the second biological signal, and the third biological signal are normal biological signals and one biological signal is a noise biological signal, guide information for changing the noise biological signal to a normal biological signal may be generated by changing the position of the biological signal measurement device  300 . For example, when the second biological signal and the third biological signal are normal biological signals and the first biological signal is a noise biological signal, the biological signal measurement device  300  or the electronic device  104  may determine that the (3-3)th wiring electrode e 3  used to generate the second biological signal and the third biological signal has been disposed at a position where a normal biological signal can be acquired, and that the (3-1)th wiring electrode e 1  and the (3-2)th wiring electrode e 2 , used to generate the first biological signal, have been disposed at positions where a normal biological signal cannot be acquired. The guide information may be generated to include a displacement amount for moving the (3-1)th wiring electrode e 1  and the (3-2)th wiring electrode e 2  in a direction in which the (3-3)th wiring electrode e 3  is disposed. 
     According to  FIG. 21C , when one biological signal among the first biological signal, the second biological signal, and the third biological signal is a normal biological signal and two biological signals thereof are noise biological signals, guide information for changing the noise biological signals to normal biological signals may be generated by changing the position of the biological signal measurement device  300 . For example, when the first biological signal is a normal biological signal and the second biological signal and the third biological signal are noise biological signals, the biological signal measurement device  300  or the electronic device  104  may determine that each of the (3-1)th wiring electrode e 1  and the (3-2)th wiring electrode e 2 , which are used to generate the first biological signal, have been disposed at a position where a normal biological signal can be acquired, and that the (3-3)th wiring electrode e 3  used to generate the second biological signal and the third biological signal has been disposed at a position where a normal biological signal cannot be acquired. The guide information may be generated to include a displacement amount for moving the (3-3)th wiring electrode e 3  toward the (3-4)th wiring electrode e 4 . 
     According to  FIG. 21D , when the first biological signal, the second biological signal, and the third biological signal are all normal biological signals, the biological signal measurement device  300  or the electronic device  104  may generate guide information indicating the completion of attachment of the biological signal measurement device  300 . 
     According to certain embodiments, the guide information may be generated, transmitted, or received in the form of data related the guide information. 
       FIG. 22  is a view for describing angle information generated using an acceleration sensor according to certain embodiments. 
     According to  FIG. 22 , the processor (e.g., the processor  120  in  FIG. 1 ) of the biological signal measurement device  300  may generate angle information of the biological signal measurement device  300  by using an acceleration sensor (not shown). For example, the processor  120  may determine a position on a first plane (e.g., XY plane) where the (3-1)th wiring electrode e 1 , the (3-2)th wiring electrode e 2 , the (3-3)th wiring electrode e 3 , or the (3-4)th wiring electrode e 4  is disposed, with reference to a first axis (axis  1 ) which is a virtual axis facing in the direction (+Z direction) perpendicular to the bottom surface of the biological signal measurement device  300 . According to an embodiment, the processor  120  may generate, based on an angle of the biological signal measurement device  300  sensed by the acceleration sensor, angle information reflecting an angle at which the biological signal measurement device  300  has been rotated in the clockwise (CW) or counterclockwise direction from a position for acquiring a normal biological signal. 
     According to certain embodiments, the acceleration sensor may sense angle information reflecting an angle at which the biological signal measurement device  300  has been disposed. The configuration of the acceleration sensor (not shown) may be partially or totally identical to that of the accelerometer  239   b  in  FIG. 2 . According to an embodiment, the acceleration sensor may be an acceleration sensor (e.g., a three-axis acceleration sensor) capable of sensing tilting in three directions. When the acceleration sensor is a three-axis acceleration sensor, the size of a power source utilized for measuring angle information may be reduced. According to another embodiment, the acceleration sensor may further include a three-axis gyro sensor. 
     According to certain embodiments, the processor (e.g., the processor  120  in  FIG. 1 ) of the biological signal measurement device  300  or another electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ), connected to the biological signal measurement device  300  via a direct (e.g., wired) communication channel or a wireless communication channel, may generate guide information in additional consideration of angle information. For example, the processor  120  or the electronic device  104  may generate, based on angle information, guide information including an angle by which the biological signal measurement device  300  is to be rotated in order to acquire a normal biological signal. 
       FIG. 23  illustrates a biological signal measurement device for outputting guide information, based on a biological signal according to certain embodiments. 
     According to  FIG. 23 , the biological signal measurement device  300  may output guide information. For example, the output unit  311   b  may output light, an image, or sound, which has been configured to reflect guide information, to the outside. The output unit  311   b  may be configured to output at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved in order to measure a normal biological signal. 
     According to certain embodiments, the output unit  311   b  may provide guide information to a user through various methods. According to an embodiment, the output unit  311   b  may include a display (e.g., the display device  160  in  FIG. 1 ), and the display may provide, based on the guide information, the user with at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved. According to another embodiment, the output unit  311   b  may include a light source (e.g., the LED  237   b  in  FIG. 2 ), and, by using the color, shape, or blinking period of light output based on the guide information, the light source may provide the user with the at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved. According another embodiment, the output unit  311   b  may include a speaker (e.g., the sound output unit  155  in  FIG. 1 ), and the speaker may provide, through sound output based on the guide information, the user with the at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved. 
     According to certain embodiments, the electronic device  104  connected to the biological signal measurement device  300  via a communication channel may output at least one of the first biological signal, the second biological signal, or the third biological signal. For example, the electronic device  104  may provide the user with the first biological signal, the second biological signal, and the third biological signal by a first graph S 10 , a second graph S 20 , and a third graph S 30 , respectively, through a display (e.g., the display  1301  in  FIG. 15 ). 
     According to certain embodiments, the processor (e.g., the processor  120  in  FIG. 1 ) of the biological signal measurement device  300  may be configured to: determine whether a measurement request has been made; and sense the first signal, the second signal, the third signal when the measurement request is made (e.g., in which the signals are not detected prior to the measurement request). According to an embodiment, the electronic device  104  may further include an attachment sensing sensor (e.g., the sensor module  176  in  FIG. 1 ) for sensing whether a protective film (e.g., the low-adhesion protective film  822  in  FIG. 12 ) detachably coupled to an attachment pad (e.g., the attachment pad  800  in  FIG. 12 ) has been detached from the attachment pad. The processor  120  may determine, using the attachment sensing sensor, that there is a measurement request when the low-adhesion protective film  822  is separated from the attachment pad  800 . According to another embodiment, the processor  120  may determine that there is a measurement request when a user input for the operation unit  311   a , which is a switch device, is performed. Further, according to another embodiment, the processor  120  may include a packaging sensing sensor (e.g., the sensor module  176  in  FIG. 1 ) for sensing whether the biological signal measurement device  300  has been packaged. For example, the packaging sensing sensor may include an illuminance sensor, and the processor  120  may determine that there is a measurement request when the illuminance of light using the illuminance sensor exceeds a predetermined range. In another example, when the illuminance of the light sensed using the illuminance sensor exceeds the predetermined range, the processor  120  may provide generated guide information to a user via the output unit  311   b . The guide information may be pre-stored in a memory (e.g., the memory  130  in  FIG. 1 ). 
     According to certain embodiments, the attachment sensing sensor may sense whether the low-adhesion protective film  822  has been attached or detached to or from the attachment pad  800  by using various methods. For example, the attachment sensing sensor may include at least one of an illuminance sensor, a piezo sensor, or a proximity sensor. 
       FIG. 24  illustrates an electronic device for outputting guide information of a biological signal measurement device according to certain embodiments.  FIG. 25  illustrates an electronic device for outputting guide information of a biological signal measurement device according to certain embodiments. 
     According to  FIGS. 24 and 25 , in order to acquire a normal biological signal, the electronic device  104  may output guide information for guiding the position of the biological signal measurement device  300 . For example, the electronic device  104  may output light, an image, or sound, which is configured to reflect guide information, to the outside. The electronic device  104  may be configured to output at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved in order to measure the normal biological signal. 
     According to certain embodiments, the electronic device  104  may provide the guide information to a user by using various methods. According to an embodiment, the electronic device  104  may provide, via the display  1301 , the user with the at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved. For example, electronic device  104  may output, based on guide information, a first pointer P 1  of which at least one of the length, the size, or the direction changes, and may provide the guide information to the user. In another example, the electronic device  104  may output, based on guide information, a second pointer P 2  of which at least one of the rotation direction or the angle changes, and may provide the guide information to the user. According to another embodiment, the electronic device  104  may provide, via the audio module  1303 ,  1307 , or  1314 , the user with at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved. 
       FIG. 26  is a flowchart for describing a method for transmitting a sensed signal and receiving guide information, by using an electronic device according to certain embodiments.  FIG. 27  is a flowchart for describing a method for transmitting a sensed signal and angle information and receiving guide information, by using an electronic device according to certain embodiments. 
     Referring to  FIG. 26 , a first method  2600  may include: receiving (or identifying) an input or request regarding measurement (S 110 ); sensing (or detecting) a signal, based on the received or identified request (S 120 ); and transmitting the sensed signal (S 130 ). 
     According to certain embodiments, the receiving (or identifying) of the input or request regarding the measurement (S 110 ) may be an operation in which the processor (e.g., the processor  120  in  FIG. 1  or the control unit  211  in  FIG. 2 ) receives or identifies a signal corresponding to a measurement start or a measurement request (e.g., a request for measuring a biological signal such as an electrocardiogram). For example, the receiving (or identifying) of the input or request regarding the measurement (S 110 ) may be at least one of an operation in which the processor receives a signal generated by operation of an operation unit (e.g., the operation unit  311   a  in  FIG. 3 ) or an operation in which the attachment sensing sensor (e.g., the sensor module  176  in  FIG. 1 ) detects separation of a protective film (e.g., the low-adhesion protective film  822  in  FIG. 12 ) from an attachment pad (e.g., the attachment pad  800  in  FIG. 8 ). According to an embodiment, in the case where an electronic device (e.g., the biological signal measurement device  300  in  FIG. 3 ) has been attached to a user&#39;s body or a patient&#39;s body, when a signal received using the electrodes (e.g., the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  in  FIG. 7 ) is initially received, the processor may determine the initial signal to be “the input or request regarding the measurement”. 
     According to certain embodiments, the sensing of a signal (S 120 ) is an operation of sensing signals generated in the user&#39;s body or the patient&#39;s body, based at least partially on the measurement request, and the processor may sense the signals by using the first electrode (e.g., the first electrode  631   a  in  FIG. 7 ), the second electrode (e.g., the second electrode  631   b  in  FIG. 7 ), the third electrode (e.g., the third electrode  631   c  in  FIG. 7 ), and the fourth electrode (e.g., the fourth electrode  631   d  in  FIG. 7 ). According to an embodiment, the processor  120  may sense a first signal by using the first electrode  631   a  and the fourth electrode  631   d  (e.g., a reference electrode) (S 120   a ), may sense a second signal by using the second electrode  631   b  and the fourth electrode  631   d  (S 120   b ), and may sense a third signal by using the third electrode  631   c  and the fourth electrode  631   d  (S 120   c ). 
     According to certain embodiments, the transmitting of the signal (S 130 ) is an operation of transmitting at least some of the signals generated in the user&#39;s body or the patient&#39;s body to another electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ) or a server (e.g., the server  108  in  FIG. 1 ) via a communication module (e.g., the communication module  190  in  FIG. 1  or the communication unit  235   a  in  FIG. 2 ), and the communication module  190  may transmit at least one of the first signal, the second signal, and the third signal to the outside. 
     According to certain embodiments, the first method  2600  may further include receiving guide information (S 140 ). The receiving of the guide information (S 140 ) is an operation of receiving guide information generated based on a biological signal, and the communication module  190  may receive the guide information from another electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ) or a server (e.g., the server  108  in  FIG. 1 ). 
     According to certain embodiments, the first method  2600  may further include outputting guide information (S 150 ). The outputting of the guide information (S 150 ) is an operation of providing, based on the guide information, the user with a position to which a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 23 ) is to be moved, and the biological signal measurement device  300  may provide, through at least one of an image, light, or sound output based on the guide information, the user with at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved. 
     Referring to  FIG. 27 , a second method  2700  may include: receiving (or identifying) an input or request regarding measurement (S 210 ); sensing a signal, based on the received or identified request (S 220 ); and transmitting the sensed signal (S 230 ). The receiving (or identifying) of an input or request regarding measurement (S 210 ), the sensing of a signal, based on the received or identified request (S 220 ), and the transmitting of the sensed signal (S 230 ) of the second method  2700  may be totally or partially identical to the receiving (or identifying) of an input or request regarding measurement (S 110 ), the sensing of a signal, based on the received or identified request (S 120 ), and the transmitting of the sensed signal (S 130 ) of the first method  2600 . 
     According to certain embodiments, the sensing of the signal (S 220 ) may include sensing an angle by using an acceleration sensor (S 220   d ). According to an embodiment, the processor  120  may determine the rotated angle of the biological signal measurement device  300  by using the acceleration sensor (e.g., the sensor module  176  in  FIG. 1 ). For example, the processor  120  may sense an angle at which each of the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  is disposed, and may generate angle information reflecting the angle at which each of the first electrode  631   a , the second electrode  631   b , the third electrode  631   c , and the fourth electrode  631   d  is disposed. 
     According to certain embodiments, the transmitting of the signal (S 230 ) may include transmitting the angle information to another electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ) or a server (e.g., the server  108  in  FIG. 1 ) via a communication module (e.g., the communication module  190  in  FIG. 1  or the communication unit  235   a  in  FIG. 2 ). For example, the communication module  190  may transmit a first signal, a second signal, a third signal, and the angle information to the outside. 
     According to certain embodiments, the second method  2700  may further include: receiving guide information (S 240 ); and outputting guide information (S 250 ). The receiving of guide information (S 240 ) and the outputting of guide information (S 250 ) of the second method  2700  may be totally or partially identical to the receiving of guide information (S 140 ) and the outputting of guide information (S 150 ) of the first method  2600 . 
       FIG. 28  is a flowchart for describing a method for outputting guide information by an electronic device for sensing a signal and by another electronic device for generating guide information, based on the sensed signal according to certain embodiments.  FIG. 29  is a flowchart for describing a method for outputting guide information by an electronic device for sensing an electrical signal and an angle and by another electronic device for generating guide information, based on the sensed signal and angle information. 
     Referring to  FIG. 28 , a third method  2800  may include: receiving (or identifying) an input or request regarding measurement (S 310 ); sensing a signal, based on the received or identified request (S 320 ); transmitting the sensed signal (S 330 ); receiving the sensed signal (S 1310 ); generating a biological signal based on the received signal (S 1320 ); and generating guide information (S 1330 ). The receiving (or identifying) of an input or request regarding measurement (S 310 ), the sensing of a signal, based on the received or identified request (S 320 ), and the transmitting of the sensed signal (S 330 ) of the third method  2800  may be totally or partially identical to the receiving (or identifying) of an input or request regarding measurement (S 110 ), the sensing of a signal, based on the received or identified request (S 120 ), and the transmitting of the sensed signal (S 130 ) of the first method  2600 . 
     According to certain embodiments, the electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ) or a server (e.g., the server  108  in  FIG. 1 ) may receive a signal sensed by a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 23 ) (S 1310 ). For example, the electronic device  104  may receive a first signal, a second signal, and a third signal, which have been sensed by the biological signal measurement device  300 , via a communication module (e.g., the communication module  190  in  FIG. 1 ). 
     According to certain embodiments, the electronic device  102  or  104  or the server  108  may generate a biological signal, based on the received signal (S 1320 ). For example, the electronic device  104  may: generate a first biological signal, based on the first signal and the second signal; generate a second biological signal, based on the second signal and the third signal; generate a third biological signal, based on the third signal and the first signal. 
     According to certain embodiments, the third method  2800  may further include generating guide information (S 1330 ). For example, the electronic device  102  or  104  or the server  108  may generate guide information, based on the generated biological signal. 
     According to certain embodiments, the third method  2800  may further include: receiving the guide information (S 340 ); and transmitting the guide information (S 1340 ). The receiving of the guide information (S 340 ) may be totally or partially identical to the receiving of the guide information (S 140 ) of the first method  2600 . The transmitting of the guide information (S 1340 ) is an operation of transmitting the guide information generated based on the biological signal, and the electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ) or a server (e.g., the server  108  in  FIG. 1 ) may transmit the guide information to the biological signal measurement device  300  via a communication module. 
     According to certain embodiments, the third method  2800  may include at least one of outputting first guide information (S 350 ) and outputting second guide information (S 1350 ). According to an embodiment, the biological signal measurement device  300  may output guide information, but the electronic device  102  or  104  may not output guide information. For example, the outputting of the first guide information (S 350 ) is an operation in which the biological signal measurement device  300  provides guide information to a user based on the received guide information. Through at least one of an image, light, or sound output based on the guide information, the biological signal measurement device  300  may provide the user with at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved. According to another embodiment, the electronic device  102  or  104  may output guide information, but the biological signal measurement device  300  may not output guide information. For example, the outputting of the second guide information (S 1350 ) is an operation in which the electronic device  102  or  104  provides guide information to a user based on the received guide information. Through at least one of an image, light, or sound output based on the guide information, the electronic device  102  or  104  may provide the user with at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved. Further, according to another embodiment, the biological signal measurement device  300  and the electronic device  102  or  104  may output guide information. For example, the biological signal measurement device  300  may output the first guide information (S 350 ), and the electronic device  102  or  104  may output the second guide information (S 1350 ). 
     Referring to  FIG. 29 , a fourth method  2900  may include: receiving (or identifying) an input or request regarding measurement (S 410 ); sensing a signal, based on the received or identified request (S 420 ); transmitting of the sensed signal (S 430 ); receiving the sensed signal (S 1410 ); generating a biological signal based on the received signal (S 1420 ); and generating guide information (S 1430 ). The receiving (or identifying) of an input or request regarding measurement (S 410 ), the sensing of a signal, based on the received or identified request (S 420 ), the receiving of the sensed signal (S 1410 ), the generating of a biological signal based on the received signal (S 1420 ), and the generating guide information (S 1430 ) of the fourth method  2900  may be totally or partially identical to the receiving (or identifying) of an input or request regarding measurement (S 310 ), the sensing of a signal, based on the received or identified request (S 320 ), the receiving of the sensed signal (S 1310 ), the generating of a biological signal based on the received signal (S 1320 ), and the generating guide information (S 1330 ) of the third method  2800 . The transmitting of the sensed signal (S 430 ) of the fourth method  2900  may be totally or partially identical to the transmitting of the sensed signal of the second method  2700 . 
     According to certain embodiments, the electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ) or a server (e.g., the server  108  in  FIG. 1  may receive angle information or an angle sensed by a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 23 ). For example, the electronic device  104  may receive the angle information, sensed by the biological signal measurement device  300 , via a communication module (e.g., the communication module  190  in  FIG. 1 ). 
     According to certain embodiments, the fourth method  2900  may further include generating guide information (S 1430 ). For example, the electronic device  102  or  104  or the server  108  may generate guide information, based on the generated biological signal or the angle information. 
       FIG. 30  is a flowchart for describing a method in which an electronic device generates guide information, based on multiple sensed signals according to certain embodiments.  FIG. 31  is a flowchart for describing a method in which an electronic device generates guide information, based on multiple sensed signals and angle information according to certain embodiments. 
     Referring to  FIG. 30 , a fifth method  3000  may include: receiving (or identifying) an input or request regarding measurement (S 510 ); sensing a signal, based on the received or identified request (S 520 ); generating a biological signal, based on the sensed signal (S 530 ); and generating guide information (S 540 ). The receiving (or identifying) of an input or request regarding measurement (S 510 ) and the sensing a signal, based on the received or identified request (S 520 ) of the fifth method  3000  may be totally or partially identical to the receiving (or identifying) of an input or request regarding measurement (S 110 ) and the sensing a signal, based on the received or identified request (S 120 ) of the first method  2600 . 
     According to certain embodiments, the fifth method  3000  may further include generating a biological signal, based on the sensed signal (S 530 ). For example, the biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 23 ) may: generate a first biological signal, based on the first signal and the second signal; generate a second biological signal, based on the second signal and the third signal; and generate a third biological signal, based on the third signal and the first signal. 
     According to certain embodiments, the fifth method  3000  may further include generating guide information (S 540 ). For example, the biological signal measurement device  300  may generate guide information, based on the generated biological signal. 
     According to certain embodiments, the fifth method  3000  may further include outputting the guide information (S 550 ). The outputting of the guide information (S 550 ) is an operation in which the biological signal measurement device  300  provides guide information to a user, based on the generate guide information. Through at least one of an image, light, or sound output based on the guide information, the biological signal measurement device  300  may provide the user with at least one of the angle, direction, or distance by which the biological signal measurement device  300  is to be moved. 
     Referring to  FIG. 31 , a sixth method  3100  may include: receiving (or identifying) an input or request regarding measurement (S 610 ); sensing of a signal, based on the received or identified request (S 620 ); generating a biological signal, based on a sensed signal (S 630 ); and generating guide information (S 640 ). The receiving (or identifying) of an input or request regarding measurement (S 610 ), the generating a biological signal, based on the sensed signal (S 630 ), and the generating of guide information (S 640 ) of the sixth method  3100  may be totally or partially identical to the receiving (or identifying) of an input or request regarding measurement (S 510 ), the generating of a biological signal, based on the sensed signal (S 530 ), and the generating of guide information (S 540 ) of the fifth method  3000 . The sensing of a signal (S 620 ) may be totally or partially identical to the sensing of a signal (S 220 ) of the second method  2700 . 
     According to certain embodiments, in the generating of a biological signal, based on a sensed signal (S 630 ), angle information may be further generated based on a sensed angle. For example, a processor (e.g., the processor  120  in  FIG. 1 ) may generate angle information reflecting an angle at which the biological signal measurement device  300  is disposed. 
     According to certain embodiments, the sixth method  3100  may further include outputting guide information (S 650 ). The outputting guide information (S 650 ) may be totally or partially identical to the outputting guide information of the fifth method  3000 . 
     An electronic device (e.g., the electronic device  101  in  FIG. 1  or a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 ) according to certain embodiments may include: a housing (e.g., the module housing  301  in  FIG. 3  or the measurement module  400  in  FIG. 5 ); a first electrode (e.g., the first electrode  631   a  in  FIG. 7 ) disposed on one surface of the housing; a second electrode (e.g., the second electrode  631   b  in  FIG. 7 ) disposed on one surface of the housing; a third electrode (e.g., the third electrode  631   c  in  FIG. 7 ) disposed on one surface of the housing; a fourth electrode (e.g., the fourth electrode  631   d  in  FIG. 7 ) disposed on one surface of the housing; a processor (e.g., the processor  120  in  FIG. 1 ) disposed in the housing; and a communication module (e.g., the communication module  190  in  FIG. 1 ) disposed in the housing, wherein the processor is configured to: sense a first signal by using the first electrode and the fourth electrode; sense a second signal by using the second electrode and the fourth electrode; and sense a third signal by using the third electrode and the fourth electrode, and wherein the communication module is configured to: transmit the first signal, the second signal, and the third signal to another electronic device (e.g., the electronic device  102  or  104 ); and receive, from the another electronic device, data which are related to guide information for guiding an attachment position of the electronic device and are generated based on a first biological signal (e.g., the first biological signal BS 1  in  FIG. 21D ) generated based on the first signal and the second signal, a second biological signal (e.g., the second biological signal BS 2  in  FIG. 21D ) generated based on the second signal and the third signal, and a third biological signal (e.g., the third biological signal BS 3  in  FIG. 21D ) generated based on the third signal and the first signal. 
     According to certain embodiments, the electronic device may include an acceleration sensor (e.g., the accelerometer  239   b  in  FIG. 2 ) disposed in the housing, the processor is configured to generate, using the acceleration sensor, angle information for reflecting the position of each of the first electrode, the second electrode, the third electrode, and the fourth electrode, and the communication module is configured to transmit the angle information to the another electronic device and receive, from the another electronic device, data related to the guide information generated in additional consideration of the angle information. 
     According to certain embodiments, the electronic device may include an attachment pad (e.g., the attachment pad  302  in  FIG. 3 ) detachably disposed at the housing, wherein the attachment pad includes: a first terminal (e.g., the first terminal  731   a  in  FIG. 9 ) electrically connectable to the first electrode; a second terminal (e.g., the second terminal  731   b  in  FIG. 9 ) electrically connectable to the second electrode; a third terminal (e.g., the third terminal  731   c  in  FIG. 9 ) electrically connectable to the third electrode; and a fourth terminal (e.g., the fourth terminal  731   d  in  FIG. 9 ) electrically connectable to the fourth electrode. 
     According to certain embodiments, the attachment pad may further include: first wiring electrodes (e.g., the first wiring electrodes  831   a  in  FIG. 12 ) electrically connected to the first terminal, the second terminal, the third terminal, or the fourth terminal, respectively; second wiring electrodes (e.g., the second wiring electrodes  831   b  in  FIG. 12 ) extending from the first wiring electrode, respectively; and third wiring electrodes (e.g., the third wiring electrodes  831   c  in  FIG. 12 ) provided at respective ends of the second wiring electrode, wherein the third wiring electrodes may be exposed in a direction different from that of the first terminal, the second terminal, the third terminal, or the fourth terminal. 
     According to certain embodiments, the electronic device may include an output unit (e.g., the output unit  311   b  in  FIG. 3 ) configured to operate based on the guide information, wherein the output unit is configured to output at least one of the angle, direction, or distance by which the electronic device is to be moved. 
     According to certain embodiments, the electronic device may include an illuminance sensor (e.g., the sensor module  176  in  FIG. 1 ) configured to sense the illuminance acquired by the electronic device, wherein the output unit is configured to output, when the illuminance exceeds a predetermined range, guide information for describing operation of the electronic device. 
     According to certain embodiments, the electronic device may further include: a protective film (e.g., the low-adhesion protective film  822  in  FIG. 12 ) detachably coupled to the attachment pad; and an attachment sensing sensor (e.g., the sensor module  176  in  FIG. 1 ) configured to sense whether the protective film is attached to or detached from the attachment pad. The processor may control supply of power to the communication module and the acceleration sensor, based on a signal sensed by the attachment sensing sensor. 
     According to certain embodiments, the processor may measure the impedance of the first electrode, the second electrode, the third electrode, or the fourth electrode. 
     An electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ) according to certain embodiments may include: a housing (e.g., the housing  1310  in  FIG. 15 ); a communication module (e.g., communication module  190  in  FIG. 1 ) disposed in the housing; and a processor (e.g., the processor  120  in  FIG. 1 ) disposed in the housing, wherein the processor is configured to: via the communication module, receive, from another electronic device (e.g., the electronic device  101  in  FIG. 1  or a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 )), which includes a first electrode (e.g., the first electrode  631   a  in  FIG. 7 ), a second electrode (e.g., the second electrode  631   b  in  FIG. 7 ), a third electrode (e.g., the third electrode  631   c  in  FIG. 7 ), and a fourth electrode (e.g., the fourth electrode  631   d  in  FIG. 7 ), a first signal generated using the first electrode and the fourth electrode, a second signal generated using the second electrode and the fourth electrode, and a third signal generated using the third electrode and the fourth electrode; acquire a first biological signal (e.g., the first biological signal BS 1  in  FIG. 21D ), based on the first signal and the second signal; acquire a second biological signal (e.g., the second biological signal BS 2  in  FIG. 21D ), based on the second signal and the third signal; acquire a third biological signal (e.g., the third biological signal BS 3  in  FIG. 21D ), based on the third signal and the first signal; acquire data related to guide information for guiding an attachment position of the another electronic device, based on the first biological signal, the second biological signal, and the third biological signal; and transmit the data related to the guide information to the another electronic device via the communication module. 
     According to certain embodiments, the communication module may be configured to further receive angle information for reflecting an angle of the another electronic device, and the processor may be configured to generate the data related to the guide information in additional consideration of the angle information. 
     According to certain embodiments, the processor may be configured to generate guide information including at least one of an angle, a direction, or a distance by which the another electronic device is to be moved. 
     According to certain embodiments, the processor may be configured to compare each of the first biological signal, the second biological signal, and the third biological signal with a preconfigured biological signal (e.g., the preconfigured biological signal (PBS) in  FIG. 20 ) to generate the guide information for guiding a displacement amount of the another electronic device. 
     According to certain embodiments, the preconfigured biological signal may include information on at least one of a QRS wave (QRS-complex), a PR segment, an ST segment, a P-R interval, a QT interval, and an amplitude of a voltage (V). 
     According to certain embodiments, the electronic device may include an output unit (e.g., the display  1301  or the audio module  1303 ,  1307 , or  1314  in  FIG. 15 ) configured to operate based on the guide information, wherein the output unit may be configured to output at least one of an angle, a direction, and a distance by which the another electronic device is to be moved. 
     According to certain embodiments, the processor may compare each of the first biological signal, the second biological signal, and the biological signal with a preconfigured biological signal so as to determine whether the first electrode, the second electrode, the third electrode, and the fourth electrode are attached to a user&#39;s body. 
     An electronic device (e.g., the electronic device  101  in  FIG. 1  or a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 ) according to certain embodiments may include: a housing (e.g., the module housing  301  in  FIG. 3  or the measurement module  400  in  FIG. 5 ); a first electrode (e.g., the first electrode  631   a  in  FIG. 7 ) disposed at the housing; a second electrode (e.g., the second electrode  631   b  in  FIG. 7 ) disposed at the housing; a third electrode (e.g., the third electrode  631   c  in  FIG. 7 ) disposed at the housing; a fourth electrode (e.g., the fourth electrode  631   d  in  FIG. 7 ) disposed at the housing; and a processor (e.g., the processor  120  in  FIG. 1 ) disposed in the housing, wherein the processor is configured to: sense a first signal by using the first electrode and the fourth electrode; sense a second signal by using the second electrode and the fourth electrode; sense a third signal by using the third electrode and the fourth electrode; generate a first biological signal (e.g., the first biological signal BS 1  in  FIG. 21D ), based on the first signal and the second signal; generate a second biological signal (e.g., the second biological signal BS 2  in  FIG. 21D ), based on the second signal and the third signal; generate a third biological signal (e.g., the third biological signal BS 3  in  FIG. 21D ), based on the third signal and the first signal; and generate data related to guide information for guiding an attachment position of the electronic device, based on the first biological signal, the second biological signal, and the third biological signal. 
     According to certain embodiments, the electronic device may include an acceleration sensor (e.g., the accelerometer  239   b  in  FIG. 2 ) disposed in the housing, wherein the processor is configured to: generate, based on the acceleration sensor, angle information reflecting a position of each of the first electrode, the second electrode, the third electrode, and the fourth electrode; and generate data related to the guide information in additional consideration of the angle information. 
     According to certain embodiments, the electronic device may include an output unit (e.g., the output unit  311   b  in  FIG. 3 ) configured to operate based on the guide information, wherein the output unit is configured to output at least one of an angle, a direction, and a distance by which the electronic device is to be moved. 
     According to certain embodiments, the processor may be configured to compare each of the first biological signal, the second biological signal, and the third biological signal with a preconfigured biological signal (e.g., the preconfigured biological signal (PBS) in  FIG. 20 ) to generate the guide information for guiding a displacement amount of the electronic device. 
     According to certain embodiments, the electronic device may include an attachment pad (e.g., the attachment pad  302  in  FIG. 3 ) detachably disposed at the housing, wherein the attachment pad may include: a first terminal (e.g., the first terminal  731   a  in  FIG. 9 ) electrically connectable to the first electrode; a second terminal (e.g., the second terminal  731   b  in  FIG. 9 ) electrically connectable to the second electrode; a third terminal (e.g., the third terminal  731   c  in  FIG. 9 ) electrically connectable to the third electrode; and a fourth terminal (e.g., the fourth terminal  731   d  in  FIG. 9 ) electrically connectable to the fourth electrode. 
     According to certain embodiments, the electronic device may include: a protective film (e.g., the low-adhesion protective film  822  in  FIG. 12 ) detachably coupled to the attachment pad; and an attachment sensing sensor (e.g., the sensor module  176  in  FIG. 1 ) configured to sense whether the protective film is attached to or detached from the attachment pad, wherein the processor may control supply of power to the communication module and the acceleration sensor, based on a signal sensed by the attachment sensing sensor. 
     An electronic device (e.g., the electronic device  102  or  104  in  FIG. 1 ) according to certain embodiments may include: a housing (e.g., the housing  1310  in  FIG. 15 ); a communication module (e.g., the communication module  190  in  FIG. 1 ) disposed in the housing; and a processor (e.g., the processor  120  in  FIG. 1 ) disposed in the housing, wherein the processor is configured to: via the communication module, acquire, from another electronic device (e.g., the electronic device  101  in  FIG. 1  or a biological signal measurement device (e.g., the biological signal measurement device  300  in  FIG. 3 )), which includes a first electrode (e.g., the first electrode  631   a  in  FIG. 7 ), a second electrode (e.g., the second electrode  631   b  in  FIG. 7 ), a third electrode (e.g., the third electrode  631   c  in  FIG. 7 ), and a fourth electrode (e.g., the fourth electrode  631   d  in  FIG. 7 ), a first signal generated using the first electrode and the fourth electrode, a second signal generated using the second electrode and the fourth electrode, and a third signal generated using the third electrode and the fourth electrode; generate a first biological signal (e.g., the first biological signal BS 1  in  FIG. 21D ), based on the first signal and the second signal; generate a second biological signal (e.g., the second biological signal BS 2  in  FIG. 21D ), based on the second signal and the third signal; generate a third biological signal (e.g., the third biological signal BS 3  in  FIG. 21D ), based on the third signal and the first signal; generate data related to guide information for guiding an attachment position of the another electronic device, based on the first biological signal, the second biological signal, and the third biological signal; and transmit the data related to the guide information to the another electronic device via the communication module. 
     It will be obvious to a person skilled in the art to which the disclosure belongs that the electronic device including an input region of certain embodiments described above is not limited to the above described embodiments and the accompanying drawings and that various substitutions, modifications, and changes are possible within the technical range of the disclosure.