Patent Publication Number: US-9892609-B2

Title: Wearable device and method of providing information by using the wearable device

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit under 35 U.S.C. §119(a) of a Korean patent application filed on May 11, 2015 in the Korean Intellectual Property Office and assigned Serial number 10-2015-0065553, the entire disclosure of which is hereby 
     TECHNICAL FIELD 
     The present disclosure relates to wearable devices that are worn on a user&#39;s body and methods of providing information by using the wearable devices. More particularly, the present disclosure relates to a wearable device easily worn on a body of a user and a method of usefully providing information obtained by using the wearable device to the user. 
     BACKGROUND 
     Due to to miniaturization and lightening of the weight of electronic devices, wearable devices worn on bodies have been developed. Also, methods of obtaining information related to users wearing the wearable devices by using the wearable devices including various sensors are being studied. Specifically, since an infant cannot suitably express his/her mind or body condition, a condition of the infant may be observed by using the wearable device. 
     When sensors are applied to the wearable device, it may be difficult for users to wear the wearable device or the sensors may not be placed at suitable locations due to different body sizes or body forms of the users wearing the wearable device. Specifically, since infants grow quickly, a wearable device that may be suitably worn according to physical changes of the infants is required. Also, a method and apparatus for usefully providing information obtained through the wearable device to the user are required. 
     The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure. 
     SUMMARY 
     Aspects of the present disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide wearable devices that may be suitably worn on a user and are capable of obtaining information related to the user. Also, provided are methods and apparatuses for usefully providing information obtained by using the wearable device to the user. 
     In accordance with an aspect of an aspect of the present disclosure, a wearable device is provided. The wearable device includes at least two sensing units configured to sense detect biometric information of a wearer of the wearable device, and a connector electrically connecting the at least two sensing units to each other and having elasticity. 
     In accordance with another aspect of the present disclosure, a system is provided. The system includes a wearable device configured to sense biometric information of a wearer by using a sensor, and an electronic apparatus configured to receive the biometric information from the wearable device, determine whether the biometric information is within a normal range, and output, when the biometric information is not within the normal range, output alarm information. 
     In accordance with another aspect of the present disclosure, a method of processing biometric information of a wearable device is provided. The method includes receiving from at least two sensing units, the biometric information of a wearer of the wearable device, the wearable device having an adjustable length, and transmitting the biometric information to a remote device when the biometric information has at least one value that falls outside a range of known good values for a corresponding sensing unit of the at least two sensing units 
     Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings in which: 
         FIG. 1  is a block diagram of a wearable device according to an embodiment of the present disclosure; 
         FIG. 2  is a perspective view of an external shape of a wearable device according to an embodiment of the present disclosure; 
         FIGS. 3A to 3C  are diagrams for describing a structure of a wearable device according to an embodiment of the present disclosure; 
         FIGS. 4A to 4C  are diagrams for describing a structure of a wearable device according to another embodiment of the present disclosure; 
         FIGS. 5A to 5C  are diagrams for describing a structure of a wearable device according to another embodiment of the present disclosure; 
         FIGS. 6A to 6C  are diagrams for describing a structure of a wearable device according to another embodiment; 
         FIG. 7  is a plan view of a structure of a wearable device according to an embodiment of the present disclosure; 
         FIG. 8  is a plan view of a structure of a wearable device according to another embodiment of the present disclosure; 
         FIG. 9  is a plan view of a structure of a wearable device according to another embodiment of the present disclosure; 
         FIG. 10  is a conceptual diagram of a system for providing information according to an embodiment of the present disclosure; 
         FIGS. 11A and 11B  are conceptual diagrams for describing a method of obtaining information by using a sensor of a wearable device according to an embodiment of the present disclosure; 
         FIGS. 12A and 12B  are circuit diagrams of a circuit included in a wearable device according to an embodiment of the present disclosure; 
         FIGS. 13 to 16  illustrate information displayed on an electronic apparatus according to various embodiments of the present disclosure; 
         FIG. 17  is a flowchart of a method of providing, by an electronic apparatus, information according to an embodiment of the present disclosure; 
         FIG. 18  is a flowchart of a method of determining, by a wearable device, whether obtained information is within a normal range according to an embodiment of the present disclosure; 
         FIG. 19  is a diagram for describing a method of providing information by using a system for providing information according to an embodiment of the present disclosure; 
         FIG. 20  is a flowchart of a method of providing, by a system, information according to an embodiment of the present disclosure; 
         FIG. 21  is a flowchart of a method of outputting by a system, feedback according to an embodiment of the present disclosure; 
         FIG. 22  is a flowchart of a method of outputting by a system, feedback according to another embodiment of the present disclosure; 
         FIG. 23  is a flowchart of a method of outputting by a system, feedback according to another embodiment of the present disclosure; 
         FIG. 24  is a diagram for describing an example of a system outputting feedback according to an embodiment of the present disclosure; 
         FIG. 25  is a block diagram of a structure of an electronic apparatus according to an embodiment of the present disclosure; 
         FIG. 26  is a block diagram of a simple structure of an electronic apparatus according to an embodiment of the present disclosure; 
         FIG. 27  is a flowchart illustrating operations of an electronic apparatus according to an embodiment of the present disclosure; 
         FIG. 28  is a plan view of a structure of a wearable device in which a location of an optical receiver is movable according to an embodiment of the present disclosure; 
         FIG. 29  is a conceptual diagram of a wearable device in which a location of an optical receiver moves gradationally according to an embodiment of the present disclosure; 
         FIGS. 30A and 30B  are conceptual diagrams of a structure of a circuit included inside an outer cover of a wearable device in which a location of a sensor unit is movable according to various embodiments of the present disclosure; 
         FIG. 31  is a cross-sectional view of a structure of a wearable device according to an embodiment of the present disclosure; 
         FIG. 32  is a diagram for describing a method of outputting alarm information according to an embodiment of the present disclosure; 
         FIG. 33  is a table for describing standards for determining whether sensor information is within a normal range according to an embodiment of the present disclosure; 
         FIG. 34  is a table for describing examples of suitable sleep patterns according to an embodiment of the present disclosure; 
         FIG. 35  is a diagram for describing a method of providing information about a sleep posture according to an embodiment of the present disclosure; and 
         FIG. 36  illustrates feedback output according to various embodiments of the present disclosure. 
     
    
    
     Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. 
     DETAILED DESCRIPTION 
     The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and the spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
     The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purpose only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents. 
     It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
     As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of”, when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. 
     In the specification, when a region is “connected” to another region, the regions may not only be “directly connected”, but may also be “electrically connected” via another device therebetween. Also, when a region “includes” an element, the region may further include another element instead of excluding the other element, otherwise differently stated. 
     Reference will now be made in detail to various embodiments, examples of which are illustrated in the accompanying drawings. 
       FIG. 1  is a block diagram of a wearable device according to an embodiment of the present disclosure. 
     Referring to  FIG. 1 , a wearable device  100  may include a controller  110 , a sensor unit  120 , a communicator  130 , a connector  140 , and an outer cover  150 . The controller  110 , the sensor unit  120 , the communicator  130 , and the connector  140  may be arranged inside the outer cover  150 . Also, the wearable device  100  may further include a power supplier (not shown) supplying power to components of the wearable device  100 . The power supplier may supply power to the components, such as the controller  110 , the sensor unit  120 , and the communicator  130 , from a chargeable battery or another power source. 
     The sensor unit  120  may obtain information for measuring a target by using at least one sensor. For example, the sensor may generate a constant signal by detecting or distinguishing, and measuring a physical amount of heat, light, a temperature, pressure, or sound, or a chemical material. In other words, the sensor may obtain information related to at least one of the wearable device  100  and a user (i.e., a wearer) of the wearable device  100 . Examples of the sensor include a temperature sensor, a humidity sensor, an acceleration sensor, and an optical sensor, but are not limited thereto. The temperature sensor is a sensor for measuring an atmospheric temperature or a body temperature of a person. The humidity sensor is a sensor for electrically detecting humidity by using properties in which a resistance value or dielectric constant of an organic polymer or ceramic changes due to vapor in the air. The optical sensor is a sensor for detecting light. The sensor unit  120  or the controller  110  may obtain biometric information of the wearer based on light detected by using the optical sensor. The biometric information may include, for example, information about oxygen saturation, pulse, and respiration. According to an embodiment, the sensor included in the sensor unit  120  may be placed outside the outer cover  150  to detect information. The outside of the outer cover  150  may include at least one of an outer surface  152  and an inner surface  154 . 
     The communicator  130  may transmit information detected by the sensor unit  120  to an external apparatus. For example, the communicator  130  may transmit information about a temperature or oxygen saturation to the external apparatus via a short-distance wireless communication. Examples of the external apparatus include a smart phone, another wearable device, a tablet personal computer (PC), a desktop computer, a laptop computer, a connected television (TV), an Internet of things (IoT) hub, and a server (e.g., a cloud server). 
     The controller  110  may control the sensor unit  120  and the communicator  130 , and process various types of information. For example, the controller  110  may include a micro-controller unit (MCU). The controller  110  may include a storage apparatus in which a control program for controlling the wearable device  100 , or an external signal or data is stored. Also, the controller  110  may include a processor for processing data. 
     According to an embodiment, the controller  110  may control power supplied to the wearable device  100 . For example, when the sensor unit  120  includes an acceleration sensor, the controller  110  may determine whether the wearable device  100  is being used based on information obtained through the acceleration sensor. When it is determined that the wearable device  100  is not being used, the controller  110  may control power supplied to each component of the wearable device  100  such that some functions of the wearable device  100  are suspended. 
     The connector  140  may electrically connect the components of the wearable device  100 . Since the wearable device  100  is worn on a body of the wearer, the connector  140  needs to be flexible. For example, the connector  140  may be a flexible printed circuit board (FPCB). 
     The outer cover  150  may be formed of a material whose shape is changeable in order to protect the sensor unit  120 , the communicator  130 , and the controller  110 , and to enable the wearable device  100  to be worn on the body of the wearer. For example, the outer cover  150  may be formed of a stretchable material, such as rubber, silicon, or urethane. 
       FIG. 2  is a perspective view of an external shape of a wearable device according to an embodiment of the present disclosure. 
     Referring to  FIG. 2 , the outer cover  150  of the wearable device  100  according to an embodiment may have a ring shape. The outer cover  150  having the ring shape may accommodate the body of the wearer in a center cavity  200 . The body of the wearer denotes a part of the body for wearing the wearable device  100 . For example, the body may be a wrist, an ankle, a forehead, or a chest. In the present specification, a size of the body may denote a circumference or a diameter of the part of the body on which the wearable device  100  is worn. The size of the body may vary according to the wearer or according to an age of the wearer. Specifically, if the wearer is an infant who grows fast, the size of the body may vary according to the age of the wearer. 
       FIGS. 3A to 3C  are diagrams for describing a structure of a wearable device according to an embodiment of the present disclosure. 
     Referring to  FIG. 3A , a sensor unit, the communicator  130 , the controller  110 , and the connector  140  may be provided in the outer cover  150  having the ring shape. The sensor unit may include a first sensor unit  121  and a second sensor unit  122 . The body of the wearer may be accommodated in the center cavity  200  of the outer cover  150  having the ring shape. Also, in order to prevent a temperature of the wearable device  100  from increasing due to heat generated by the components (the first sensor unit  121 , the second sensor unit  122 , the communicator  130 , the controller  110 , and the connector  140 ) provided in the outer cover  150 , at least one hole  300  through which air passes may be formed on an outer surface of the outer cover  150 . 
     Referring to  FIGS. 3B and 3C , a length of the connector  140  may be stretchable in order to connect the components (the first sensor unit  121 , the second sensor unit  122 , the communicator  130 , the controller  110 , and the connector  140 ) even when the outer cover  150  stretches. For example, referring to  FIG. 3B , the connector  140  may include a stretchable PCB. The stretchable PCB may be configured by using not only a wire formed of metal, but also a wire formed of a conductive stretchable material. For example, the stretchable PCB may be formed by using not only wrinkled copper formed on urethane, but also a conductive material, such as conductive polymer, carbon nanotube, or graphene. As another example, referring to  FIG. 3C , the connector  140  may include FPCB having a wrinkled shape. When the outer cover  150  extends due to the body of the wearer, or the like, wrinkles of the connector  140  may spread, and the connector  140  may extend as much as an increased length of the outer cover  150 . 
       FIGS. 4A to 4C  are diagrams for describing a structure of a wearable device according to another embodiment of the present disclosure. Specifically, the wearable device  100  of  FIGS. 4A to 4C  includes a reflective oxygen saturation detector using an optical sensor. 
     Referring to  FIG. 4A , the first sensor unit  121  may include a temperature sensor  121 - 1  for detecting a temperature around the wearable device  100 . The temperature sensor  121 - 1  may be a temperature/humidity sensor for detecting not only a temperature but also humidity. Also, the second sensor unit  122  may include an optical sensor. The optical sensor may include an emitter  122 - 1  emitting an optical signal  412  and an optical receiver  122 - 2  receiving an optical signal  414 . The emitter  122 - 1  may include a laser diode (LD) for generating the optical signal  412 . The optical receiver  122 - 2  may include a photodiode (PD) that receives the optical signal  414  reflected from a body  15  of a wearer and converts the optical signal  414  to an electric signal. Also, the second sensor unit  122  may further include a body temperature sensor  121 - 3  for detecting a body temperature of the wearer. 
     For example, when the wearable device  100  is worn on an ankle of the wearer, the first sensor unit  121  may be provided at the front of the ankle. Also, the second sensor unit  122  may be provided at the back of the ankle, which is opposite to where the first sensor unit  121  is provided. 
     In order to detect an external atmospheric temperature and/or humidity, the temperature sensor  121 - 1  may be externally exposed through the outer surface  152  of the outer cover  150 . Also, the temperature sensor  121 - 1  may further include a humidity sensor for detecting external humidity. Also, in order to measure the oxygen saturation of the body  15 , the emitter  122 - 1  and the optical receiver  122 - 2  may be externally exposed through the inner surface  154  of the outer cover  150 . The optical signal  412  emitted from the emitter  122 - 1  is reflected at the body  15  of the wearer wearing the wearable device  100 . A light absorption coefficient varies according to a ratio of oxyhemoglobin (HbO2) and reduced hemoglobin (Hb) in blood of the wearer. In other words, a wavelength of reflected light changes according to the ratio of HbO2 and Hb. The optical receiver  122 - 2  may convert the optical signal  414  into an electric signal. The second sensor unit  122  or the controller  110  may determine the oxygen saturation based on the electric signal received from the optical receiver  122 - 2 . Also, the second sensor unit  122  or the controller  110  may obtain information about pulse or respiration of the wearer based on the electric signal received from the optical receiver  122 - 2 . 
     The controller  110  may control the communicator  130  to transmit the temperature and the oxygen saturation determined by the first and second sensor units  121  and  122  to another device. 
     Referring to  FIGS. 4B and 4C , the length of the connector  140  may be configured to be stretchable in order to connect the components (the first sensor unit  121 , the second sensor unit  122 , the communicator  130 , the controller  110 , and the connector  140 ) even when the outer cover  150  stretches. For example, referring to  FIG. 4B , the connector  140  may include a stretchable PCB. The stretchable PCB may be configured by using not only a wire formed of a metal, but also a wire formed of a conductive stretchable material. For example, the stretchable PCB may be configured by using not only wrinkled copper formed on urethane, but also by using a conductive material, such as conductive polymer, carbon nanotube, or graphene. As another example, referring to  FIG. 4C , the connector  140  may include a wrinkled FPCB. When the outer cover  150  extends due to the body  15  of the wearer, wrinkles of the connector  140  may spread and thus the connector  140  may stretch as long as an increased length of the outer cover  150 . 
       FIGS. 5A to 5C  are diagrams for describing a structure of a wearable device according to another embodiment of the present disclosure. 
     Referring to  FIG. 5A , like the wearable device  100  of  FIG. 4A , the wearable device  100  of  FIG. 5A  may include the controller  110 , the first sensor unit  121 , the second sensor unit  122 , and the communicator  130 . The first sensor unit  121  may include the temperature sensor  121 - 1  exposed at the outer surface  152  and an emitter  121 - 2  including an LD exposed at the inner surface  154 . Also, the second sensor unit  122  may include the optical receiver  122 - 2  including a PD exposed at the inner surface  154 . In other words, the emitter  121 - 2  and the optical receiver  122 - 2  may face each other, wherein the body  15  is provided therebetween. In this case, light  512  emitted from the emitter  121 - 2  may pass through the body  15  and transmitted to the optical receiver  122 - 2 . By measuring oxygen saturation by using the light  512  that passed through the body  15 , the oxygen saturation may be accurately obtained. Also, the second sensor unit  122  or the controller  110  may obtain information about pulse or respiration of the wearer based on an optical signal detected through the optical receiver  122 - 2 . 
     The optical receiver  122 - 2  may be provided on the inner surface  154 , and may be provided opposite to the emitter  121 - 2 . For example, when the body  15  on which the wearable device  100  is worn is an ankle, the emitter  121 - 2  may be located in front of the ankle and the optical receiver  122 - 2  may be located at the back of the ankle. However, an arrangement of the emitter  121 - 2  and the optical receiver  122 - 2  is not limited thereto. 
     According to an embodiment, in order to obtain accurate information, the optical receiver  122 - 2  of the wearable device  100  may include a plurality of PDs  122 - 3  through  122 - 5  as shown in  FIGS. 6A to 6C . 
     Referring to  FIGS. 5B and 5C , the length of the connector  140  may be configured to be stretchable in order to connect the components (the first sensor unit  121 , the second sensor unit  122 , the communicator  130 , the controller  110 , and the connector  140 ) even when the outer cover  150  stretches. For example, referring to  FIG. 5B , the connector  140  may include a stretchable PCB. The stretchable PCB may be configured by using not only a wire formed of a metal, but also a wire formed of a conductive stretchable material. For example, the stretchable PCB may be configured by using not only wrinkled copper formed on urethane, but also by using a conductive material, such as conductive polymer, carbon nanotube, or graphene. As another example, referring to  FIG. 5C , the connector  140  may include a wrinkled FPCB. When the outer cover  150  extends due to the body  15  of the wearer, wrinkles of the connector  140  may spread and thus the connector  140  may stretch as long as an increased length of the outer cover  150 . 
       FIGS. 6A to 6C  are diagrams for describing a structure of a wearable device according to another embodiment of the present disclosure. 
     Referring to  FIG. 6A , the optical receiver  122 - 2  of the wearable device  100  may include the plurality of PDs  122 - 3  through  122 - 5 . The PDs  122 - 3  through  122 - 5  may each receive light  612  that is emitted from the emitter  121 - 2  and penetrated through the body  15  of the wearer. The controller  110  or the second sensor unit  122  may select a PD that received a most satisfactory optical signal from among the PDs  122 - 3  through  122 - 5 . The most satisfactory optical signal may denote a signal having a greatest strength from among received signals. However, an embodiment is not limited thereto, and when the strength of an optical signal is equal to or higher than a certain threshold value, that is, when the strength of the optical signal is too great, the optical signal may have an error by an effect of an external light source, and so, a PD that receives another optical signal may be selected. The controller  110  or the second sensor unit  122  may deactivate the PDs  122 - 3  through  122 - 5  excluding the selected PD. The second sensor unit  122  may measure oxygen saturation by using the selected PD. 
     Referring to  FIGS. 6B and 6C , the length of the connector  140  may be configured to be stretchable in order to connect the components (the first sensor unit  121 , the second sensor unit  122 , the communicator  130 , the controller  110 , and the connector  140 ) even when the outer cover  150  stretches. For example, referring to  FIG. 6B , the connector  140  may include a stretchable PCB. The stretchable PCB may be configured by using not only a wire formed of a metal, but also a wire formed of a conductive stretchable material. For example, the stretchable PCB may be configured by using not only wrinkled copper formed on urethane, but also by using a conductive material, such as conductive polymer, carbon nanotube, or graphene. As another example, referring to  FIG. 6C , the connector  140  may include a wrinkled FPCB. When the outer cover  150  extends due to the body  15  of the wearer, wrinkles of the connector  140  may spread and thus the connector  140  may stretch as long as an increased length of the outer cover  150 . 
       FIG. 7  is a plan view of a structure of a wearable device according to an embodiment of the present disclosure. 
     Referring to  FIG. 7 , the wearable device  100  may have a band shape. The wearable device  100  may be worn on a body of a wearer by including a fastening portion at two ends of an outer cover. The fastening portion may include a protruding portion  712  and an accommodating portion  714 . One end of the outer cover of the wearable device  100  may include the protruding portion  712  and the other end of the outer cover may include a plurality of the accommodating portions  714  that accommodate and are fastened to the protruding portion  712 . However, an embodiment is not limited thereto, and a structure of the fastening portion may vary. 
     Also, the body temperature sensor  121 - 3  for measuring a body temperature of the wearer, and the emitter  122 - 1  and the optical receiver  122 - 2  for measuring oxygen saturation, pulse, and respiration of the wearer may be exposed on one surface of the wearable device  100 . The optical receiver  122 - 2  may be disposed near the emitter  122 - 1  in order to receive light emitted from the emitter  122 - 1  and reflected from the body of the wearer. 
       FIG. 8  is a plan view of a structure of a wearable device according to another embodiment of the present disclosure. 
     Referring to  FIG. 8 , the emitter  121 - 2  may be located away from the optical receiver  122 - 2  such that the emitter  121 - 2  and the optical receiver  122 - 2  are located on opposite sides to each other with respect to a body of a wearer when the wearer wears the wearable device  100 . However, at this time, a location of the optical receiver  122 - 2  may not be suitable to receive light emitted from the emitter  121 - 2  based on a size or part of the body of the wearer. For example, the emitter  121 - 2  and the optical receiver  122 - 2  may face each other when the wearable device  100  is worn on an ankle of the wearer, the ankle having a width diameter of 3 cm. However, when the wearable device  100  is worn on an ankle having a width diameter of 5 cm, relative locations of the optical receiver  122 - 2  and the emitter  121 - 2  may change and the optical receiver  122 - 2  and the emitter  121 - 2  may not be aligned to face each other. Accordingly, the wearable device  100  may include a connector (e.g., the connector  140  of  FIG. 6B or 6C ) that electrically connects the emitter  121 - 2  and the optical receiver  122 - 2  and has a variable length. Alternatively, the optical receiver  122 - 2  of the wearable device  100  according to an embodiment may include a plurality of PDs to obtain accurate biometric information. 
       FIG. 9  is a plan view of a structure of a wearable device according to another embodiment of the present disclosure. 
     Referring to  FIG. 9 , the wearable device  100  may include the plurality of PDs  122 - 3  through  122 - 5  that are spaced apart from the emitter  121 - 2 . 
       FIG. 10  is a conceptual diagram of a system for providing information according to an embodiment of the present disclosure. 
     Referring to  FIG. 10 , the wearable device  100  may be worn on a body (e.g., a wrist or an ankle) of a wearer. The wearable device  100  worn on the body may obtain biometric information of the wearer or environment information of the wearer. The wearable device  100  may transmit obtained information to an electronic apparatus  1000 . 
     Upon receiving the information from the wearable device  100 , the electronic apparatus  1000  may obtain information related to the wearer based on the received information. For example, when the wearable device  100  includes an acceleration sensor, information transmitted from the wearable device  100  to the electronic apparatus  1000  may include information about physical movement of the wearable device  100 . The electronic apparatus  1000  may determine a position (e.g., a sleep posture) of the wearer based on the information about physical movement of the wearable device  100 . 
       FIGS. 11A and 11B  are conceptual diagrams for describing a method of obtaining information by using a sensor of a wearable device according to an embodiment of the present disclosure.  FIGS. 11A and 11B  are cross-sectional views of the wearable device of  FIG. 9  worn on a body of a wearer. 
     Referring to  FIGS. 11A and 11B , the body of the wearer has a width diameter of 3 cm in  FIG. 11A , and in  FIG. 11B , the body of the wearer has a width diameter of 5 cm. 
     The wearable device  100  may be fixed to the body of the wearer by using the fastening portion, that is, the protruding portion  712  in  FIG. 11A . The emitter  122 - 1  including an LD may emit light while the wearable device  100  is fixed to the body. An optical signal emitted from the emitter  122 - 2  is scattered in the body, and the PDs  122 - 3  through  122 - 5  of the wearable device  100  may each receive the optical signal that penetrates through the body. The wearable device  100  may receive a PD that received a most satisfactory optical signal from among the PDs  122 - 3  through  122 - 5 . For example, referring to  FIG. 11A , the PD  122 - 4  or  122 - 5  may be selected. However, if a size of the body increases as shown in  FIG. 11B , the wearable device  100  may select the PD  122 - 4  or  122 - 3 . In other words, the wearable device  100  will activate only a PD that receives a signal having a greatest strength and deactivates the remaining PDs, thereby reducing power consumption. Alternatively, when at least one PD is not activated, the wearable device  100  may obtain information determined to have a most suitable value from among information received by a plurality of PDs as information detected by using a sensor. 
     Alternatively, according to another embodiment, an average value of values included in information received by a plurality of PDs may be obtained as information detected by using a sensor, or a sum of the values included in the information received by the plurality of PDs may be obtained as the information detected by using a sensor. Alternatively, information may be obtained by grouping a plurality of PDs. However, an embodiment is not limited thereto, and a method of obtaining, by the sensor unit  120  of the wearable device  100 , information when the sensor unit  120  includes a plurality of sensors, such as a plurality of PDs, may vary according to various embodiments. 
       FIGS. 12A and 12B  are circuit diagrams of a circuit included in the wearable device  100  according to an embodiment of the present disclosure.  FIG. 12A  is a plan view of the circuit included in the wearable device  100 , and  FIG. 12B  is a bottom view of the circuit included in the wearable device  100 . The circuit in  FIGS. 12A and 12B  are only an example, and is not limited thereto. 
     Referring to  FIGS. 12A and 12B , the circuit included in the wearable device  100  according to an embodiment may include a power supplier  1210 , the first sensor unit  121 , the controller  110 , the second sensor unit  122 , and the communicator  130 . 
     The power supplier  1210  may include a switch  1212  for turning on or off the wearable device  100 , a power terminal  1214  connected to a power source (not shown), such as a batter, and a charging terminal  1216  for charging the battery. 
     The first sensor unit  121  may include the temperature sensor  121 - 1  for measuring an external atmospheric temperature or a temperature, an acceleration sensor  121 - 4  for measuring movement of the wearable device  100 , and the body temperature sensor  121 - 3  for measuring a body temperature of the wearer. As shown in  FIGS. 12A and 12B , the temperature sensor  121 - 1  and the body temperature sensor  121 - 3  may be provided on opposite sides of a PCB. Alternatively, the temperature sensor  121 - 1  and the body temperature sensor  121 - 3  may be provided together in the controller  110  or the second sensor unit  122 , but an embodiment is not limited thereto. 
     The second sensor unit  122  may include a light sensing unit  123 . The light sensing unit  123  may obtain information, such as oxygen saturation, pulse, and respiration, by using the emitter  122 - 1  and the optical receiver  122 - 2  provided opposite to the PCB. 
     The controller  110  may include a microcontroller that processes data and controls each component of the wearable device  100 . 
     The communicator  130  may externally transmit information obtained through the first and second sensor units  121  and  122 , via a short-distance wireless communication. For example, the communicator  130  may transmit information by using Bluetooth low energy (BLE). 
     The connector  140  electrically connects at least two components. Also, the connector  140  may be formed of a flexible material for a shape change of the wearable device  100 . 
       FIGS. 13 to 16  illustrate information displayed on an electronic apparatus according to various embodiments of the present disclosure. 
     Referring to  FIG. 13 , the electronic apparatus  1000  may display a history  1310  of information obtained through the wearable device  100 , posture information  1320 , and real-time data  1330 . 
     The history  1310  of the information obtained through the wearable device  100  may be shown in a graph of information received in the past. Also, the posture information  1320  may include information about a position of the wearer, which is estimated based on an acceleration value received through the wearable device  100 . Also, the real-time data  1330  may include information lastly received from the wearable device  100  and information related to the lastly received information. According to an embodiment, the information lastly received from the wearable device  100  may include oxygen saturation, pulse, a skin temperature, an ambient atmospheric temperature, ambient humidity, and a respiration rate per hour, but is not limited thereto. Information related to the lastly received information may include information generated by the electronic apparatus  1000  based on the lastly received information. For example, the electronic apparatus  1000  may determine a state of the wearer based on the pulse rate and the respiration rate per hour. The state may be information indicating whether the wearer is sleeping or awake. When the pulse rate and the respiration rate per hour are equal to or higher than a threshold value, the electronic apparatus  1000  may determine that the wearer is awake. The threshold value is an experimental value and may vary according to various embodiments. 
     Referring to  FIG. 14 , the electronic apparatus  1000  may display abstract information  1410  of the real-time data  1330  in a separate window. The electronic apparatus  1000  may display the abstract information  1410  including information about oxygen saturation, pulse rate, respiration, a skin temperature, an ambient temperature, and ambient humidity obtained through the wearable device  100 , on a window for displaying the abstract information  1410 . 
     Also, according to an embodiment, the electronic apparatus  1000  may determine whether a state of the wearer wearing the wearable device  100  is normal based on information received from the wearable device  100 . For example, the electronic apparatus  1000  may determine whether the pulse, the respiration rate per hour, and the oxygen saturation received from the wearable device  100  are within a pre-set range or within a range set by a user of the electronic apparatus  1000 . In other words, the electronic apparatus  1000  may determine whether information obtained by using the wearable device  100  is within a normal range. 
     Referring to  FIG. 15 , when at least one of the pulse rate, the respiration rate per hour, and the oxygen saturation is outside the normal range, the electronic apparatus  1000  may display an alarm message  1510 . For example, the electronic apparatus  1000  may determine the state of the wearer of the wearable device  100  based on the information received from the wearable device  100 . When at least one of the pulse rate, the respiration rate per hour, and the oxygen saturation is outside the normal range, the electronic apparatus  1000  may determine that the state of the wearer is not normal. When it is determined that the state of the wearer is not normal, the electronic apparatus  1000  may display the alarm message  1510 . 
     According to another embodiment, the electronic apparatus  1000  may determine whether the wearable device  100  is suitably worn on the body of the wearer based on the information received from the wearable device  100 . For example, when sensor information received from the wearable device  100  is outside a pre-set range (e.g., lower than or equal to a first threshold value and equal to or higher than a second threshold value), the electronic apparatus  1000  may determine that the sensor information has an error or the wearable device  100  is unsuitably worn on the body of the wearer. In this case, the electronic apparatus  1000  may display alarm information guiding the wearer to adjust a wearing state of the wearable device  100  or to adjust a position of a sensor. 
     Referring to  FIG. 16 , according to an embodiment, when the state of the wearer of the wearable device  100  is changed from a sleeping state to a woken state, the electronic apparatus  1000  may display a message  1610  indicating that the wearer is awake. According to another embodiment, the electronic apparatus  1000  may predict a time when the wearer wakes up based on information received from the wearable device  100 . The electronic apparatus  1000  may display the message  1610  indicating that the wearer is awake according to the predicted time. 
     However, information is not limitedly displayed on the electronic apparatus  1000  of  FIGS. 13 to 16 . For example, the information of  FIGS. 13 to 16  may be displayed on a display included in another device, such as a refrigerator, a washing machine, a TV, or a wearable device other than the wearable device  100 . As another example, when the wearable device  100  includes a display, the information of  FIGS. 13 to 16  may be displayed on the display of the wearable device  100 . Also, the information of  FIGS. 13 to 16  may be displayed on at least one device by being transmitted to the at least one device. Also, the information of  FIGS. 13 to 16  may be displayed on a device currently used by a user from among devices connected through IoT. 
     Also, according to another embodiment, the wearable device  100  may include at least one of a speaker (not shown) and a color displayer (not shown). The speaker may output a sound signal according to an electric signal. The wearable device  100  including the speaker may output alarm sound by using the speaker when an alarm message is to be displayed as in  FIG. 15 or 16 . The color displayer outputs colored light according to an electric signal. For example, when an alarm message is to be displayed as in  FIG. 15 or 16 , the color displayer may output red light by using a device for outputting light, such as a light emitting diode (LED). 
       FIG. 17  is a flowchart of a method of providing, by an electronic apparatus, information according to an embodiment of the present disclosure. 
     Referring to  FIG. 17 , in operation S 1710 , the electronic apparatus  1000  may receive, from the wearable device  100 , sensor information that is information obtained by using a sensor included in the wearable device  100 . When there is the wearable device  100  communicably connected to the electronic apparatus  1000  before operation S 1710 , the electronic apparatus  1000  may receive the sensor information from the wearable device  100  in operation S 1710 . According to an embodiment, the electronic apparatus  1000  may be initially communicably connected to the wearable device  100  according to control of a user, and then store information for establishing communication connection with the wearable device  100 , thereby automatically communicably connecting to the wearable device  100  later. For example, when the electronic apparatus  1000  is turned on, the electronic apparatus  1000  may be automatically communicably connected to the wearable device  100  having a history of communication connection. Alternatively, in operation S 1710 , the electronic apparatus  1000  may receive sensor information broadcasted by the wearable device  100 . 
     In operation S 1720 , the electronic apparatus  1000  may determine whether the sensor information is within a normal range. In order to determine whether the sensor information is within the normal range, information about the normal range may be pre-stored in the electronic apparatus  1000  or may be downloaded to the electronic apparatus  1000  from an external source through a network. When it is determined that the sensor information is within the normal range, the electronic apparatus  1000  may output the sensor information in operation S 1730 . Whether the sensor information is included in the normal range may be determined according to various embodiments. For example, referring to  FIG. 33 , when the sensor information includes information about oxygen saturation, it may be determined that the sensor information is within the normal range if the oxygen saturation is equal to or higher than 95%. Also, when the sensor information includes information about a heart rate, it may be determined that the sensor information is within the normal range if the heart rate is between 120 to 140 times. Also, when the sensor information includes information about a respiration rate per minute, it may be determined that the sensor information is within the normal range if the respiration rate per minute is between 30 to 40 times. Also, when the sensor information includes information about a body temperature, it may be determined that the sensor information is within the normal range if the body temperature is between 36.8 to 37.3° C. Also, the electronic apparatus  1000  may determine whether the sensor information is within the normal range based on a combination of at least two pieces of information. When it is determined that the sensor information is outside the normal range, the electronic apparatus  1000  may output alarm information indicating that the state of the wearer of the wearable device  100  is not normal, in operation S 1740 . The alarm information may be embodied in any one of various forms, such as a message displayed on a display, pre-set colored light, an icon, sound, or vibration. 
     According to another embodiment, the electronic apparatus  1000  may determine whether the wearable device  100  is suitably worn on a body of the wearer based on information received from the wearable device  100 . For example, when the sensor information is outside a pre-set range (e.g., lower than or equal to a first threshold value and equal to or higher than a second threshold value), the electronic apparatus  1000  may determine that the sensor information has an error or the wearable device  100  is unsuitably worn on the body of the wearer. In this case, the electronic apparatus  1000  may output the alarm information guiding the wearer to adjust a wearing state of the wearable device  100  or to adjust a position of a sensor. 
     According to another embodiment, the wearable device  100  may determine whether the information obtained by the wearable device  100  is within a pre-set range or within a range set by a user of the wearable device  100 , that is, within the normal range. 
     When it is determined that the obtained information is within the normal range, the wearable device  100  may transmit the obtained information to the electronic apparatus  1000  through the communicator  130 . Alternatively, when it is determined that the obtained information is outside the normal range, the wearable device  100  may transmit alarm information indicating that the state of the wearer is not normal to the electronic apparatus  1000  through the communicator  130 . 
       FIG. 18  is a flowchart of a method of determining, by a wearable device, whether obtained information is within a normal range according to an embodiment of the present disclosure. 
     Referring to  FIG. 18 , in operation S 1715 , the wearable device  100  may obtain sensor information detected by using a sensor included in the sensor unit  120 . The wearable device  100  may determine whether the sensor information is within a normal range in operation S 1725 . Whether the sensor information is included in the normal range may be determined according to various embodiments. For example, referring to  FIG. 33 , when the sensor information includes information about oxygen saturation, it may be determined that the sensor information is within the normal range if the oxygen saturation is equal to or higher than 95%. Also, when the sensor information includes information about a heart rate, it may be determined that the sensor information is within the normal range if the heart rate is between 120 to 140 times. Also, when the sensor information includes information about a respiration rate per minute, it may be determined that the sensor information is within the normal range if the respiration rate per minute is between 30 to 40 times. Also, when the sensor information includes information about a body temperature, it may be determined that the sensor information is within the normal range if the body temperature is between 36.8 to 37.3° C. Also, the wearable device  100  may determine whether the sensor information is within the normal range based on a combination of at least two pieces of information. 
     According to another embodiment, the electronic apparatus  1000  may determine whether the wearable device  100  is suitably worn on a body of the wearer based on information received from the wearable device  100 . For example, when the sensor information is outside a pre-set range (e.g., less than or equal to a first threshold value and greater than or equal to a second threshold value), the electronic apparatus  1000  may determine that the sensor information has an error or the wearable device  100  is unsuitably positioned on the body of the wearer. In this case, the electronic apparatus  1000  may output the alarm information guiding the wearer to adjust a wearing state of the wearable device  100  or to adjust a position of a sensor. 
     When it is determined that the sensor information is not within the normal range, the wearable device  100  may transmit state information to the electronic apparatus  1000 , in operation S 1735 . When the electronic apparatus  1000  communicably connected to the wearable device  100  exists before operation S 1735 , the wearable device  100  may directly transmit the state information to the electronic apparatus  1000 . According to an embodiment, the wearable device  100  may be initially communicably connected to the electronic apparatus  1000  according to control of a user, and then store information for establishing communication connection with the electronic apparatus  1000 , thereby automatically communicably connecting to the electronic apparatus  1000  later. For example, when the wearable device  100  is turned on, the wearable device  100  may be automatically communicably connected to the electronic apparatus  1000  having a history of communication connection. Alternatively, when there is no electronic apparatus communicably connected to the wearable device  100 , the wearable device  100  may broadcast the state information in operation S 1735  to notify an emergency. According to an embodiment, the state information may include at least one of the sensor information, alarm information indicating that the sensor information is outside the normal range, alarm information indicating that the wearable device  100  is not suitably worn, alarm information guiding the wearer to adjust the wearing state of the wearable device  100 , and alarm information guiding the wearer to adjust the location of the sensor. 
       FIG. 19  is a diagram for describing a method of providing information by using a system according to an embodiment of the present disclosure. 
     Referring to  FIG. 19 , the wearable device  100  may receive a short-distance wireless communication signal from a beacon  1810  broadcasting identification (ID) information via a short-distance wireless communication. The short-distance wireless communication signal may be a signal for performing communication within a short distance. For example, the short-distance wireless communication signal may be a wireless communication signal according to BLE standards, a wireless communication signal according to Wi-Fi standards, or a signal according to Zigbee standards, but is not limited thereto. The wearable device  100  may determine a relative location of the beacon  1810  based on the short-distance wireless communication signal. In other words, the wearable device  100  determines a distance between the beacon  1810  and the wearable device  100 . For example, the wearable device  100  may determine the distance based on received signal strength indication (RSSI) from the beacon  1810 . When the distance is less than or equal to a pre-set distance  1820  as a wearer  10  of the wearable device  100  moves, the wearable device  100  may transmit an alarm message to the electronic apparatus  1000 . 
     Alternatively, the wearable device  100  may transmit information about the short-distance wireless communication signal to the electronic apparatus  1000 . The electronic apparatus  1000  may display an alarm message based on the information about the short-distance wireless communication signal. For example, the electronic apparatus  1000  may receive information about strength of the short-distance wireless communication signal, and determine the distance between the wearable device  100  and the beacon  1810  based on the information about the strength. When the distance between the wearable device  100  and the beacon  1810  is within the pre-set distance  1820 , the electronic apparatus  1000  may display the alarm message. 
     The beacon  1810  of  FIG. 19  may be replaced by another apparatus capable of broadcasting a short-distance wireless communication signal. For example, the beacon  1810  may be a certain IoT device. In other words, an apparatus that is dangerous and included in an IoT environment, such as an iron or an electric heater, may perform operations of the beacon  1810 . According to an embodiment, an apparatus that is classified to be dangerous only while being used may broadcast a short-distance wireless communication signal only while being used. Whether an apparatus is dangerous may be determined according to various embodiments. For example, a user may set whether an apparatus is dangerous through a mobile terminal or IoT hub connected to IoT. As another example, an apparatus may be determined to be dangerous according to standards set by an application interworking with the wearable device  100 . As another example, the wearable device  100  may receive standards for determining whether an apparatus is dangerous from an external server, and determine whether an apparatus is dangerous based on the received standards. 
       FIG. 20  is a flowchart of a method of providing, by a system, information according to an embodiment of the present disclosure. 
     Referring to  FIG. 20 , in operation S 1910 , the wearable device  100  may receive a short-distance wireless communication signal. Then, in operation S 1920 , the wearable device  100  may notify the electronic apparatus  1000  that the short-distance wireless communication signal is received. 
     According to an embodiment, the wearable device  100  may determine a distance between the wearable device  100  and a location where the short-distance wireless communication signal is transmitted based on RSSI. When the distance is lower than or equal to a pre-set value, the wearable device  100  may transmit alarm information to the electronic apparatus  1000  in operation S 1920 . Then, in operation S 1930 , the electronic apparatus  1000  may output the alarm information. For example, when the wearable device  100  worn on a baby receives the short-distance wireless communication signal from the beacon  1810  as shown in  FIG. 19 , the wearable device  100  may transmit the alarm information to a smart phone of the baby&#39;s mother. Upon receiving the alarm information, the smart phone may display the alarm information, generate alarm sound, or transmit the alarm information to a device currently used by the mother (e.g., a TV if the mother is watching the TV). 
     According to another embodiment, the wearable device  100  may transmit information about the short-distance wireless communication signal to the electronic apparatus  1000 , in operation S 1920 . For example, the wearable device  100  may transmit strength of the short-distance wireless communication signal to the electronic apparatus  1000 . However, an embodiment is not limited thereto. The electronic apparatus  1000  may determine whether to output the alarm information based on the information about the short-distance wireless communication signal. The electronic apparatus  1000  may output the alarm information in operation S 1930  based on a result of the determining. 
       FIG. 21  is a flowchart of a method of outputting, by a system, feedback according to an embodiment of the present disclosure. 
     Referring to  FIG. 21 , in operation S 1915 , the wearable device  100  may monitor a location of the wearable device  100 . According to an embodiment, the wearable device  100  may monitor the location of the wearable device  100  by calculating a distance between the wearable device  100  and another device (e.g., the beacon  1810  of  FIG. 18 ) by using a wireless communication signal broadcasted from the other apparatus. However, an embodiment is not limited thereto. 
     Then, in operation S 1925 , the wearable device  100  may determine whether the wearable device  100  is located within a danger zone. For example, the wearable device  100  may receive a wireless communication signal broadcasted from an external apparatus, and determine whether the external apparatus is a dangerous apparatus and a distance between the external apparatus and the wearable device  100  based on the wireless communication signal. Whether the external apparatus is a dangerous apparatus may be determined by using any one of various methods. For example, the wearable device  100  may determine a type of the external apparatus based on ID information of the external apparatus included in the wireless communication signal, and determine whether the external apparatus is a dangerous apparatus. As another example, the wireless communication signal may include information indicating that the external apparatus is a dangerous apparatus. However, an embodiment is not limited thereto, and another arbitrary method may be used to determine whether the external apparatus is a dangerous apparatus. When it is determined that the distance between the wearable device  100  and the external apparatus is less than or equal to a threshold value (e.g., 1 m), the wearable device  100  may determine that the wearable device  100  is located within the danger zone. 
     When it is determined that the wearable device  100  is located within the danger zone, the wearable device  100  may output feedback in operation S 1935 . The feedback may be output so as to attract the attention of the wearer (i.e., specifically if the wearer is an infant) of the wearable device  100  in the danger zone and entices the wearer to another location so that the wearer moves away from the danger zone. A method of outputting feedback may vary according to various embodiments. According to an embodiment, the wearable device  100  may output an alarm sound. The alarm sound may be replaced by a parent&#39;s voice calling the wearer of the wearable device  100 , wearer&#39;s favorite music, or vibration using a vibration motor included in the wearable device  100 , but a replacement of the alarm sound is not limited thereto. Alternatively, the wearable device  100  may request the electronic apparatus  1000  to output the feedback. The electronic apparatus  1000  may be a terminal or IoT apparatus of a guardian who is not in the danger zone. The feedback may be output in any one of various forms, such as sound, vibration, and an alarm message. For example, the parent&#39;s voice calling an infant, or infant&#39;s favorite image or music may be output. 
     According to an embodiment, when it is determined that the wearable device  100  is in the danger zone in operation S 1925 , a danger level of the wearer of the wearable device  100  may be gradationally determined based on the distance between the wearable device  100  and the external apparatus. For example, when the distance between the wearable device  100  and the external apparatus is equal to or higher than 0.5 m and lower than 1 m, the wearable device  100  may determine that the danger level is a first level. Also, when the distance is less than 0.5 m, the wearable device  100  may determine that the danger level is a second level. In this case, the wearable device  100  may determine the feedback to be output in operation S 1935  according to the danger level. For example, when the danger level is determined to be the first level, the wearable device  100  may output an alarm sound. Also, when the danger level is determined to be the second level, the wearable device  100  may the output alarm sound with vibration by using the vibration motor included in the wearable device  100 . Alternatively, the feedback to be output may be gradationally selected according to a danger level indicated by ID information of the external apparatus, based on the ID information included in the wireless communication signal. 
       FIG. 22  is a flowchart of a method of outputting, by the system, feedback according to another embodiment of the present disclosure. The method of  FIG. 22  may be performed by the wearable device  100 , but an embodiment is not limited thereto. 
     Referring to  FIG. 22 , in operation S 22010 , the wearable device  100  may determine a distance between the wearable device  100  and a danger point in order to monitor wither the wearable device  100  is located within a danger zone. The danger point may be a location of an object recognizable by the wearable device  100 . For example, the danger point may be a location where the beacon  1810  of  FIG. 18  or an IoT apparatus broadcasting a short-distance wireless communication signal is located. 
     Then, in operation S 22020 , the wearable device  100  may determine whether the wearable device  100  is located within the danger zone based on the distance between the wearable device  100  and the danger point. When it is determined that the wearable device  100  is located within the danger zone, the wearable device  100  may request a first electronic apparatus to output feedback, in operation S 22030 . The first electronic apparatus that is to output the feedback may be determined in any one of various methods. According to an embodiment, the first electronic apparatus may be a terminal communicably connected to the wearable device  100 , for example, a parent&#39;s smart phone. According to another embodiment, considering the danger point and a location of the wearable device  100 , the first electronic apparatus may be an IoT device located at a point suitable for inducing the wearer of the wearable device  100  to move outside the danger zone. For example, the first electronic apparatus may reproduce a parent&#39;s voice in order to induce an infant wearing the wearable device  100  in a direction where the first electronic apparatus is located. According to another embodiment, the first electronic apparatus may be a device at a fixed location, such as a TV. 
     In operation S 22040 , the wearable device  100  may determine whether the wearable device  100  is away from the danger point. When it is determined that the wearable device  100  is not away from the danger point, the wearable device  100  may request the first electronic apparatus to increase strength of the outputting of the feedback in operation S 22045 . For example, the wearable device  100  may increase volume of sound output from the first electronic apparatus. As another example, the wearable device  100  may generate vibration by using the vibration motor, in addition to the sound. 
     When it is determined that the wearable device  100  is away from the danger point, the wearable device  100  determines whether the wearable device  100  is located within the danger zone in operation S 22050 . When it is determined that the wearable device  100  is still located in the danger zone, the wearable device  100  may select a second electronic apparatus suitable for outputting feedback according to a current location of the wearable device  100 , and request the second electronic apparatus to output feedback. 
       FIG. 23  is a flowchart of a method of outputting, by the system, feedback according to another embodiment of the present disclosure. The method of  FIG. 23  may be performed by an apparatus, such as a terminal or IoT hub, connected to the wearable device  100 , but an embodiment is not limited thereto. For convenience of description, the method of  FIG. 23  is performed by a relay apparatus. 
     Referring to  FIG. 23 , in operation S 23010 , the relay apparatus may determine a distance between a danger point and the wearable device  100  in order to monitor whether the wearable device  100  is located within a danger zone. The danger point may be a location where an object recognizable by the wearable device  100  is located. For example, the danger point may be a location where the beacon  1810  of  FIG. 18  or an IoT apparatus broadcasting a short-distance wireless communication signal is located. In order to determine the distance between the danger point and the wearable device  100 , the relay apparatus may receive, from the wearable device  100 , information about the distance between the danger point and the wearable device  100  or about strength of a wireless communication signal received by the wearable device  100 . 
     In operation S 23020 , the relay apparatus may determine whether the wearable device  100  is located within a danger zone based on the distance between the danger point and the wearable device  100 . When it is determined that the wearable device  100  is located within the danger zone, the relay apparatus may request a first electronic apparatus to output feedback, in operation S 23030 . The first electronic apparatus may vary according to various embodiments. 
     In operation S 23040 , the relay apparatus receives, from the wearable device  100 , distance information including the distance between the danger point and the wearable device  100  or the strength of the wireless communication signal. In operation S 23050 , the relay apparatus may determine whether the wearable device  100  has moved nearer to the first electronic apparatus based on the distance information. When it is determined that the wearable device  100  did not move nearer to the first electronic apparatus, the relay apparatus may request the first electronic apparatus to increase a strength of the outputting of the feedback, in operation S 23045 . The relay apparatus may request the wearable device  100  to generate a vibration. 
     When it is determined that the wearable device  100  has moved nearer to the first electronic apparatus, the relay apparatus may determine again whether the wearable device  100  is located within the danger zone, in operation S 23060 . When it is determined that the wearable device  100  is not located within the danger zone, the relay apparatus stops the outputting of the feedback and continuously monitors the location of the wearable device  100 . When it is determined that the wearable device  100  is located within the danger zone, the relay apparatus may request a second electronic apparatus to output feedback, in operation S 23070 . 
       FIG. 24  is a diagram for describing an example of a system outputting feedback according to an embodiment of the present disclosure. 
     Referring to  FIG. 24 , an electric kettle  24010  is being used. Also, a distance between the wearer  10  wearing the wearable device  100  and the electric kettle  24010  is within a distance  24020  having a threshold value. The electric kettle  24010  may be broadcasting a short-distance wireless communication including information for identifying an electric kettle. Also, the electric kettle  24010  may be an IoT apparatus. 
     In order to induce the wearer  10  to move away from the electric kettle  24010 , a smart phone  1000 - 1 , that is, a first electronic apparatus, may output an alarm (feedback), such as a parent&#39;s voice or an image. Also, when the wearer  10  moves to a first location  24030 , a TV  1000 - 2 , that is, a second electronic apparatus, may output an alarm so as to induce the wearer  10  to move away from the electric kettle  24010 . When the wearer  10  moves to a second location  24240 , the TV  1000 - 2  may stop the outputting of the alarm. 
     According to an embodiment, an apparatus that is dangerous only while being used, such as the electric kettle  24010  or a fan, may stop being used when the wearable device  100  approaches the apparatus within the distance  24020 . 
       FIG. 25  is a block diagram of a structure of an electronic apparatus according to an embodiment of the present disclosure. The electric apparatus of  FIG. 25  is only an example, and the electric apparatus may include more or less components than those shown in  FIG. 25 . The electronic apparatus may be a mobile phone, a smart phone, a tablet PC, a connected TV, a personal digital assistant (PDA), a PC, or a laptop, but is not limited thereto. 
     Referring to  FIG. 25 , the electronic apparatus  1000  may transmit and receive information to and from an external apparatus including the wearable device  100  by using a communicator  2020 . 
     The electronic apparatus  1000  may include a controller  2010 , the communicator  2020 , a camera module  2030 , a global positioning system (GPS) module  2040 , an input/output (I/O) module  2050 , a storage unit  2060 , a sensor module  2070 , a power supplier  2080 , and a displayer  2090 . 
     The communicator  2020  may include at least one of a mobile communication module, a sub-communication module, and a multimedia module. The sub-communication module may include at least one of a wireless local area network (LAN) module and a short-distance communication module. The multimedia module may include at least one of a broadcasting communication module, an audio reproduction module, and a video reproduction module. The camera module  2030  may include at least one camera. The I/O module  1050  may include at least one of a button, a microphone, a speaker, a vibration motor, a connector, and a keypad. 
     The controller  2010  may include a central processing unit (CPU)  2011 , a read-only memory (ROM)  2012  in which a control program for controlling the electronic apparatus  1000  is stored, and a random access memory (RAM)  2013  in which a signal or data input from the outside of the electronic apparatus  1000  is stored or which is used as a storage area for operations performed in the electronic apparatus  1000 . The CPU  2011  may include a plurality of processors, such as a single core, a dual core, a triple core, or a quad core. The CPU  2011 , the ROM  2012 , and the RAM  2013  may be connected to each other through an internal bus. 
     The controller  2010  may control the communicator  2020 , the camera module  2030 , the GPS module  2040 , the I/O module  2050 , the storage unit  2060 , the sensor module  2070 , the power supplier  2080 , and the displayer  2090 . 
     The mobile communication module may connect the electronic apparatus  1000  to an external apparatus via a mobile communication by using at least one antenna, under control of the controller  2010 . The mobile communication module may transmit and receive a wireless signal for a voice call, an image call, short-message service (SMS) transmission, or multimedia service (MMS) transmission to and from a mobile phone corresponding to a phone number input to the displayer  2090 , a smart phone, a tablet PC, or another apparatus. 
     The sub-communication module may include at least one of a wireless LAN module and a short-distance communication module. For example, the sub-communication module may include only a wireless LAN module, only a short-distance communication module, or both a wireless LAN module and a short-distance communication module. 
     The wireless LAN module may be connected to the Internet at a place where a wireless access point (AP) (not shown) is installed, according to control of the controller  2010 . The wireless LAN module may support IEEE 802.11x that is wireless LAN standards of IEEE. The short-distance communication module may provide a wireless short-distance communication between the electronic apparatus  1000  and the wearable device  100 , according to control of the controller  2010 . A short-distance communication method may include Bluetooth, infrared data association (IrDA), or Zigbee. 
     The electronic apparatus  1000  may include at least one of the mobile communication module the wireless LAN module, and the short-distance communication module according to performance of the electronic apparatus  1000 . 
     The multimedia module may include a broadcasting communication module, an audio reproduction module, or a video reproduction module. The broadcasting communication module may receive a broadcast signal and broadcast additional information through a broadcasting communication antenna, according to control of the controller  2010 . The audio reproduction module may reproduce a digital audio file that is stored or received according to control of the controller  2010 . The video reproduction module may reproduce a digital video file that is stored or received according to control of the controller  2010 . 
     The camera module  2030  may include at least one camera capturing a still image or a moving image according to control of the controller  2010 . 
     The GPS module  2040  may receive radio waves from a plurality of GPS satellites on the earth&#39;s orbit, and calculate a location of the electronic apparatus  1000  by using a time of arrival from the GPS satellites to the electronic apparatus  1000 . 
     The I/O module  2050  may include at least one of a plurality of buttons, a microphone, a speaker, a vibration motor, a connector, and a keypad. 
     The buttons may be provided on a front surface, a side surface, or a rear surface of a housing of the electronic apparatus  1000 , and may include at least one of a power/lock button, a volume button, a menu button, a home button, a back button, and a search button. The microphone may generate an electric signal upon receiving voice or sound, according to control of the controller  2010 . The speaker may output sound corresponding to various signals to the outside the electronic apparatus  1000 , according to control of the controller  2010 . The vibration motor may convert an electric signal into mechanical vibration, according to control of the controller  2010 . The connector may be used as an interface for connecting the electronic apparatus  1000  to an external apparatus or a power source. The keypad may be an interface receiving a key input for controlling the electronic apparatus  1000 . Examples of the keypad include a physical keypad formed on the electronic apparatus  1000  and a virtual keypad displayed on the displayer  2090 , when the displayer  2090  is a touch screen. The physical keypad may not be used according to performance or structure of the electronic apparatus  1000 . 
     The sensor module  2070  may include at least one sensor detecting a state of the electronic apparatus  1000 . For example, the sensor module  1070  may include a proximity sensor detecting proximity of the electronic apparatus  1000 , an illuminance sensor detecting an amount of light, or a motion sensor detecting an operation of the electronic apparatus  1000  (e.g., rotation of the electronic apparatus  1000  or acceleration or vibration of the electronic apparatus  1000 ). The sensor of the sensor module  2070  may be added or removed according to performance of the electronic apparatus  1000 . 
     The storage unit  2060  may store signal and data input and output according to operations of the communicator  2020 , camera module  2030 , GPS module  2040 , I/O module  2050 , sensor module  2070 , and displayer  2090 , according to control of the controller  2010 . The storage unit  2060  may store a control program and application for controlling the electronic apparatus  1000  or controller  2010 . 
     The term “storage unit” may include the storage unit  2060 , the ROM  2012  or the RAM  2013  included in the controller  2010 , or a memory card provided in the electronic apparatus  1000 . The storage unit may be a nonvolatile memory, a volatile memory, a hard disk drive (HDD), or a solid state drive (SSD). 
     The power supplier  2080  may supply power to at least one battery (not shown) provided in the housing of the electronic apparatus  1000 , according to control of the controller  2010 . Also, the power supplier  2080  may provide power input from an external power source (not shown) to each component of the electronic apparatus  1000  through a wireless cable connected to the connector. 
     The displayer  2090  may output an image, such as a graphic user interface (GUI), corresponding to any one of various services. The displayer  2090  may include a touch screen according to performance of the electronic apparatus  1000 . 
       FIG. 26  is a block diagram of a simple structure of an electronic apparatus according to an embodiment of the present disclosure. 
     Referring to  FIG. 26 , the electronic apparatus  1000  according to an embodiment may include the controller  2010 , the communicator  2020 , and the displayer  2090 . According to an embodiment, the communicator  2020  may receive sensor information (i.e., information obtained by using a sensor of the wearable device  100 ) from the wearable device  100 . 
     The controller  2010  may generate related information based on the sensor information received through the communicator  2020 . According to an embodiment, the controller  2010  may determine a state of the wearer of the wearable device  100 . For example, the controller  2010  may determine that the wearer is sleeping when a pulse rate and a respiration rate included in the sensor information are within a pre-set range. 
     According to another embodiment, the controller  2010  may predict a point of time when the state of the wearer is to be changed, based on the sensor information. For example, the controller  2010  may determine that the wearer is sleeping based on the pulse rate and the respiration rate included in the sensor information, and predict when the wearer will wake up based on a history of the sensor information. A method of predicting a point of time when the state of the wearer is to be changed may be realized by pre-matching sleeping hours corresponding to the pulse rate and the respiration rate. However, an embodiment is not limited thereto. When the controller  2010  determines the point of time when the state of the wearer is to be changed, the displayer  2090  may output an alarm message at the determined point of time. 
     According to another embodiment, the controller  2010  may determine sleep guide information, such as a recommended number of sleeps and a recommended sleep posture, based on the sensor information. The controller  2010  may determine sleep information based on the sensor information. The sleep information may include information about how the wearer of the wearable device  100  sleeps, for example, at least one of whether the wearer is sleeping, a number of sleeps, sleeping hours, and a sleep posture. When it is determined that the wearer is not having a deep sleep based on the sleep information, the controller  2010  may determine the sleep guide information of the wearer. The sleep guide information may be information provided to the wearer such that the wearer gets a proper sleep. For example, the sleep guide information may include at least one of a recommended number of sleeps, recommended sleeping hours, a recommended sleep posture, and a sleeping environment creating method. The displayer  2090  may display the sleep information and the sleep guide information. 
       FIG. 27  is a flowchart illustrating operations of an electronic apparatus according to an embodiment of the present disclosure. 
     Referring to  FIG. 27 , in operation S 2210 , the electronic apparatus  1000  may receive sensor information from the wearable device  100 . 
     The electronic apparatus  1000  may generate related information based on the sensor information. According to an embodiment, the wearable device  100  may determine a state of the wearer of the wearable device  100 . For example, when pulse rate and a respiration rate included in the sensor information are within a pre-set range, the electronic apparatus  1000  may determine that the wearer is sleeping, in operation S 2220 . In operation S 2230 , the electronic apparatus  1000  may display the sensor information and the state of the wearer. 
     According to another embodiment, the electronic apparatus  1000  may predict a point of time when the state of the wearer is to be changed based on the sensor information. For example, the electronic apparatus  1000  may determine whether the wearer is sleeping based on the pulse rate and the respiration rate included in the sensor information, and predict when the wearer may wake up based on a history of the sensor information. A method of predicting a point of time when the state of the wearer is to be changed may be realized by pre-matching sleeping hours corresponding to the pulse rate and the respiration rate. However, an embodiment is not limited thereto. When the point of time when the state of the wearer is to be changed is determined, the electric apparatus  1000  may output an alarm message at the determined point of time. 
       FIG. 28  is a diagram of an appearance of a wearable device in which a location of an optical receiver is movable according to an embodiment of the present disclosure. 
     Referring to  FIG. 28 , the wearable device  100  according to an embodiment may include an optical receiver  122 - 6  that is movable in order to receive light emitted from the emitter  121 - 2 . For example, the optical receiver  122 - 6  may move along a guideline  2300  formed on an outer cover of the wearable device  100 , but an embodiment is not limited thereto. 
     The wearable device  100  includes the optical receiver  122 - 6  that is movable, but alternatively, the emitter  121 - 2  may be movable. Alternatively, the emitter  121 - 2  and the optical receiver  122 - 6  may each be movable. 
       FIG. 29  is a conceptual diagram of a wearable device in which the location of an optical receiver moves gradationally according to an embodiment of the present disclosure. 
     Referring to  FIG. 29 , when the wearable device  100  includes the optical receiver  122 - 6  that is movable, the wearable device  100  may be realized such that the location of the optical receiver  122 - 6  is gradationally movable. 
     For example, the wearable device  100  may be realized such that the optical receiver  122 - 6  is fixed at a first location  2410 , a second location  2420 , or a third location  2430  with respect to an outside of the wearable device  100 , by using a latch or the like. 
       FIGS. 30A and 30B  are conceptual diagrams of a structure of a circuit included inside an outer cover of a wearable device in which a location of a sensor unit is movable according to various embodiments of the present disclosure. 
     Referring to  FIG. 30A , the connector  140  of the wearable device  100  may include a connector  140 - 1  that is stretchable and connects the sensor unit  120  (e.g., including an optical sensor) and another component, and a connector  140 - 2  that is not stretchable. For example, the connector  140 - 1  that connects the sensor unit  120  and the other component may be configured as a stretchable PCB. 
     Referring to  FIG. 30B , as another example, the connector  140 - 1  that connects the sensor unit  120  and the other component may be configured as a FPCB having wrinkles. 
     When the connector  140 - 1  is stretchable, durability of the connector  140 - 1  may be low compared to the connector  140 - 2  that is not stretchable, due to a flexible structure of the connector  140 - 1 , and thus durability of the circuit included in the wearable device  100  may be increased by forming only a part of the connector  140 - 1  to be stretchable. Also, by using the connector  140 - 1  that is stretchable, information to be detected through the sensor unit  120  may be detected at an accurate location. 
       FIG. 31  is a cross-sectional view of a structure of a wearable device, according to an embodiment of the present disclosure. 
     Referring to  FIG. 31 , the outer cover  150  has a ring structure, and only the connector  140 - 1  from among the connector  140  is stretchable. The connector  140 - 1  connecting the second sensor unit  122  and the controller  110  may have a stretchable structure as the connector  140 - 1  of  FIG. 30A or 30B . Also, the second sensor unit  122  may be movable within the outer cover  150 . By moving the location of the second sensor unit  122 , the location of the optical receiver  122 - 2  for receiving the light  512  emitted from the emitter  121 - 2  of the first sensor unit  121  may be moved. 
     Also, for durability of a circuit, the connector  140 - 2  connecting the controller  110  and the first sensor unit  121  and the connector  140 - 2  connecting the first sensor unit  121  and the communicator  130  may be configured of a fixed PCB or a flexible PCB. 
     Arrangements of components shown in  FIG. 31  are only an example, and locations and arrangements of the components may be changed according to various embodiments. 
       FIG. 32  is a diagram for describing a method of outputting alarm information according to an embodiment of the present disclosure. The method of  FIG. 32  is only an example, and thus is not limited thereto. 
     Referring to  FIG. 32 , when sensor information obtained by the wearable device  100  is not within a normal range, alarm information may be output. The alarm information may be output in any one of various forms, according to various embodiments. According to an embodiment, the wearable device  100  may include a display  160  that is externally exposed on the outer cover  150 . In this case, the wearable device  100  may display the alarm information through the display  160 . 
     Alternatively, the wearable device  100  may transmit the alarm information to an electronic apparatus  2810 . A type of the electronic apparatus  2810  may vary. For example, the electronic apparatus  2810  may be a connected TV, a smart phone, a tablet PC, or an IoT hub, which is capable of receiving the alarm information from the wearable device  100 , but is not limited thereto. 
     Upon receiving the alarm information, the electronic apparatus  2810  may directly output the alarm information or transmit the alarm information to another device. The electronic apparatus  2810  may select a suitable device and transmit the alarm information to the suitable device. For example, the electronic apparatus  2810  may search for a device currently used, and transmit the alarm information to a found device. The alarm information may be output in a suitable form according to performance of a device that received the alarm information. For example, when the alarm information is transmitted to a refrigerator  2820  or a washing machine  2830 , which includes a display, the alarm information may be displayed on the display of the refrigerator  2820  or the washing machine  2830 . As another example, when the alarm information is transmitted to a wearable device  2840  worn by a wearer other than the wearer of the wearable device  100 , the wearable device  2840  may output the alarm information by using at least one of vibration, sound, and a screen. As another example, when the alarm information is transmitted to a communicable earphone  2850 , the alarm information may be output by using vibration or sound. 
     According to an embodiment, a device outputting the alarm information may vary according to a type of the alarm information. For example, when there is a device communicably connected to the wearable device  100 , alarm information indicating that the wearer of the wearable device  100  woke up may be transmitted only to the communicably connected device. Alternatively, when there is no device communicably connected to the wearable device  100 , the alarm information indicating that the wearer of the wearable device  100  woke up may be transmitted to a device being used by the wearer or to a device recently used by the wearer. On the other hand, alarm information indicating an emergency, for example, abnormal oxygen saturation, abnormal respiration, or abnormal heart rate, may be broadcasted to all devices around the wearable device  100 . 
       FIG. 33  is a table for describing standards for determining whether sensor information is within a normal range according to an embodiment of the present disclosure. 
     Referring to  FIG. 33 , the wearable device  100  or the electronic apparatus  1000  may determine whether sensor information is within a normal range based on the table shown in  FIG. 33 . However, an embodiment is not limited thereto, and standards for determining whether sensor information is within a normal range may vary according to various embodiments. For example, referring to  FIG. 33 , it may be determined that the sensor information is within the normal range when oxygen saturation included in the sensor information is equal to or higher than 95%. However, it may be determined that the sensor information is not within the normal range when the oxygen saturation included in the sensor information is lower than 95%. As another example, it may be determined that the sensor information is within the normal range when a heart rate included in the sensor information is between 120 to 140 times. As another example, it may be determined that the sensor information is within the normal range when a body temperature included in the sensor information is between 36.8 to 37.3° C. 
     According to an embodiment, the wearable device  100  or the electronic apparatus  1000  may recommend suitable sleep patterns. In other words, sleep information may be determined based on sensor information obtained through a sensor of the wearable device  100 . Also, the wearable device  100  may provide sleep guide information based on the sleep information. 
       FIG. 34  is a table for describing examples of suitable sleep patterns according to an embodiment of the present disclosure. 
     Referring to  FIG. 34 , according to an embodiment, the wearable device  100  or the electronic apparatus  1000  may determine night sleeping hours, day sleeping hours, a number of daytime naps, and total number of sleeping hours of the wearer of the wearable device  100 , based on the sensor information. When the night sleeping hours, the day sleeping hours, the number of daytime naps, and the total sleeping hours do not match the suitable sleep patterns shown in  FIG. 34 , the wearable device  100  or the electronic apparatus  1000  may output alarm information recommending the suitable sleep patterns. For example, when the wearer of the wearable device  100  is 9 month old and the number of daytime naps is 4 times. The wearable device  100  or the electronic apparatus  1000  may output alarm information that the wearer needs to reduce the number of day sleeps. 
       FIG. 35  is a diagram for describing a method of providing information about a sleep posture according to an embodiment of the present disclosure. 
     Referring to  FIG. 35 , the wearable device  100  or the electronic apparatus  1000  may determine a sleep posture of the wearer of the wearable device  100  based on sensor information obtained by the wearable device  100 . For example, the sleep posture of the wearer may be determined based on sensor information obtained by an acceleration sensor or a gyro sensor detecting movement of the wearable device  100 . The wearable device or the electronic apparatus  1000  may output at least one of information about the sleep posture and information about posture correction  3100 . For example, the wearable device  100  or the electronic apparatus  1000  may display, through a display of the wearable device  100  or the electronic apparatus  1000 , a message related to the sleep posture of the wearer as shown in  FIG. 35 . 
       FIG. 36  illustrates feedback output according to various embodiments of the present disclosure. 
     Referring to  FIG. 36 , suitable information according to a state of a wearer of the wearable device  100  may be output through the electronic apparatus  1000 , as feedback regarding sensor information. According to an embodiment, the suitable information may be output based on the state of the wearer and profile information related to the wearer, which are determined according to the sensor information. The profile information may be transmitted from the wearable device  100  to the electronic apparatus  1000 , or may be stored in the electronic apparatus  1000 . Alternatively, the profile information may be received from an external server, but an embodiment is not limited thereto. 
     When respiration and a heartbeat of the wearer are not detected, a link  3600  for calling a rescue team may be displayed through the electronic apparatus  1000 . Also, when the wearer is an infant of 12-months or less, information  3610 - 1  for performing cardiopulmonary resuscitation (CPR) on the infant may be displayed through the electronic apparatus  1000 . Alternatively, when the wearer is a child over 12-months, information  3610 - 2  for performing CPR on the child may be displayed through the electronic apparatus  1000 . 
     As another example, when a body temperature of the wearer, which is included in the sensor information, is higher than a threshold value, text such as “Please put on lighter clothes or reduce fever by cooling the forehead”. As another example, when oxygen saturation of the wearer, which is included in the sensor information, is lower than a threshold value, text such as “Oxygen saturation may reduce when lung pressure temporarily increases while crying if lungs are weak. Please comfort baby and monitor oxygen saturation. If oxygen saturation still remains low even after baby is calm, please see doctor”. By outputting the text, a user of the electronic apparatus  1000  may determine steps to be taken based on a state of the wearer of the wearable device  100  without having to perform a separate search. 
     According to an embodiment, information provided as feedback of sensor information may be stored in the electronic apparatus  1000 . According to another embodiment, information provided as feedback of sensor information may be downloaded to the electronic apparatus  1000  from an external server, such as a cloud server. As another example, information provided as feedback of sensor information may be searched from an online community. The online community is a virtual information sharing space accessible by using an application related to the wearable device  100 , the application installed in the electronic apparatus  1000 . Alternatively, the online community may include an online space pre-associated with the application installed in the electronic apparatus  1000 , but an embodiment is not limited thereto. The electronic apparatus  1000  may output, as the feedback of the sensor information, information searched from the online community based on a state of the wearer and profile information of the wearer (e.g., a gender, a height, a weight, and an age). 
     An embodiment may also be realized in a form of a computer-readable recording medium, such as a program module executed by a computer. A computer-readable recording medium may be an arbitrary available medium accessible by a computer, and examples thereof include all volatile media, such as a RAM, and non-volatile media, such as a ROM, and separable and non-separable media. Further, examples of the computer-readable recording medium may include a computer storage medium and a communication medium. Examples of the computer storage medium include all volatile and non-volatile media and separable and non-separable media, which have been implemented by an arbitrary method or technology, for storing information such as computer-readable commands, data structures, program modules, and other data. The communication medium typically include a computer-readable command, a data structure, a program module, other data of a modulated data signal, or another transmission mechanism, and an example thereof includes an arbitrary information transmission medium. For example, the computer storage medium may be ROM, RAM, a flash memory, compact disc (CD), digital versatile disc (DVD), a magnetic disk, or a magnetic tape. 
     While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.