Air conditioner and method for controlling the same

An air conditioner and a method for controlling the same are disclosed. The air conditioner includes a compressor; an indoor fan configured to blow an indoor air; and a controller configured to change and control a revolutions per minute (RPM) of the indoor fan to a predetermined time when the compressor is off.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2017-0088164, filed on Jul. 12, 2017 in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference in its entirety.

BACKGROUND

Embodiments of the present disclosure relate to an air conditioner and a method for controlling the same.

2. Description of the Related Art

An air conditioner is an apparatus that cools or heats indoor air. The air conditioner performs a cooling by using the characteristic of absorbing the surrounding heat when a liquid refrigerant vaporizes, and performs a heating by using the characteristic of releasing heat when a gaseous refrigerant liquefies.

A typical air conditioner generally connects a single indoor unit to a single outdoor unit. However, in recent times, demand for a system air conditioner which connects a plurality of indoor units having various types and capacities to a single outdoor unit, is increasing.

Currently, the air conditioner performs a cleaning operation by operating an indoor fan when a compressor is off during a cooling operation. At this time, the condensate generated in a heat-exchanger during the cooling operation is rapidly evaporated, causing a hydrophilic odor, which may cause a user to feel uncomfortable.

SUMMARY

Therefore, it is an aspect of the present disclosure to provide an air conditioner capable of smoothly draining and evaporating condensate remaining in an indoor heat-exchanger after a compressor is turned off, and a method for controlling the same.

In accordance with an aspect of the present disclosure, an air conditioner includes: a compressor; an indoor fan configured to blow an indoor air; and a controller configured to change and control a revolutions per minute (RPM) of the indoor fan to a predetermined time when the compressor is turned off.

When a plurality of indoor fans is provided, the controller may operate only a predetermined lower indoor fan from among the plurality of indoor fans is driven for a first time when the compressor is off, and operate the plurality of indoor fans for a second time when the first time is exceeded.

The controller may operate only the lower indoor fan at a minimum RPM when operating only the lower indoor fan.

The controller may set the RPMs of the plurality of indoor fans such that an indoor fan disposed at a lower side among the plurality of indoor fans has a greater value of RPM when operating the plurality of indoor fans.

When a single indoor fan is provided, the controller may operate the indoor fan at a minimum RPM for a first time when the compressor is turned off, and operate the indoor fan to a value larger than the minimum RPM for a second time when the first time is exceeded.

The controller may operate the indoor fan in a weak wind mode for the first time, and operates the indoor fan in a strong wind mode or a turbo mode for the second time.

In accordance with another aspect of the present disclosure, an air conditioner includes: a compressor; an indoor fan configured to blow an indoor air; and a controller configured to maintain the indoor fan in a stop state for a first time when the compressor is turned off, and operate the indoor fan at a predetermined revolutions per minute (RPM) for a second time when the first time is exceeded.

When a plurality of indoor fans is provided, the controller may set the RPMs of the plurality of indoor fans such that an indoor fan disposed at a lower side among the plurality of indoor fans has a greater value of RPM when operating the indoor fan is operated at the predetermined RPM.

In accordance with another aspect of the present disclosure, a method for controlling an air conditioner includes: performing a cooling operation; and changing and controlling a revolutions per minute (RPM) of an indoor fan to a predetermined time when a compressor is turned off.

When a plurality of indoor fans is provided, the changing and controlling of the RPM of the indoor fan to the predetermined time may include operating only a predetermined lower indoor fan from among the indoor fans for a first time; and operating the plurality of indoor fans for a second time when the first time is exceeded.

The changing and controlling of the RPM of the indoor fan to the predetermined time may further include operating only the lower indoor fan at a minimum RPM.

The changing and controlling of the RPM of the indoor fan to the predetermined time may further include setting the RPMs of the plurality of indoor fans such that an indoor fan disposed at a lower side among the plurality of indoor fans has a greater value of RPM when operating the plurality of indoor fans.

When a single one indoor fan is provided, the changing and controlling of the RPM of the indoor fan to the predetermined time may include operating the indoor fan at a minimum RPM for a first time; and operating the indoor fan to a value larger than the minimum RPM for a second time when the first time is exceeded.

The operating of the indoor fan at the minimum RPM for the first time may include operating the indoor fan in a weak wind mode for the first time, and the operating of the indoor fan to the value larger than the minimum RPM for the second time may include operating the indoor fan in a strong wind mode or a turbo mode for the second time.

In accordance with another aspect of the present disclosure, a method for controlling an air conditioner includes: performing a cooling operation; maintaining an indoor fan in a stop state for a first time when a compressor is turned off; and operating the indoor fan at a predetermined revolutions per minute (RPM) for a second time when the first time is exceeded.

When a plurality of indoor fans is provided, the operating of the indoor fan at the predetermined RPM may include setting the RPMs of the plurality of indoor fans such that an indoor fan disposed at a lower side among the plurality of indoor fans has a greater value of RPM.

DETAILED DESCRIPTION

Like numerals refer to like elements throughout the specification. Not all elements of embodiments of the present disclosure will be described, and description of what are commonly known in the art or what overlap each other in the embodiments will be omitted. The terms as used throughout the specification, such as “˜part”, “˜module”, “˜member”, “˜block”, etc., may be implemented in software and/or hardware, and a plurality of “˜parts”, “˜modules”, “˜members”, or “˜blocks” may be implemented in a single element, or a single “˜part”, “˜module”, “˜member”, or “˜block” may include a plurality of elements.

The term “include (or including)” or “comprise (or comprising)” is inclusive or open-ended and does not exclude additional, unrecited elements or method steps, unless otherwise mentioned.

The principle and exemplary embodiments of the present disclosure will now be described with reference to accompanying drawings.

Further, the air conditioner described below can be applied to all types of air conditioners, such as a stand type, a wall-mounted type, and a system type

FIG. 1is a view illustrating a configuration of an air conditioner.

Referring toFIG. 1, an air conditioner1may include an outdoor unit10and an indoor unit20. Although not shown, the outdoor unit10and the indoor unit20may include a communicator to transmit and receive power and communication signals to each other.

The outdoor unit10may include a compressor11to compress refrigerant into high-temperature high-pressure gas state, a four-way valve12to switch flow of the high-temperature high-pressure gaseous refrigerant compressed in the compressor11, an outdoor heat-exchanger13to receive the high-temperature high-pressure gaseous refrigerant compressed in the compressor11and exchange heat with outdoor air, an outdoor fan14to forcedly blow outdoor air by an outdoor fan motor15so that heat exchange is performed in the outdoor heat-exchanger13, and an electronic expansion valve17to decompress and expand the heat exchanged refrigerant while controlling the refrigerant flow rate. At this time, the electronic expansion valve (EEV)17may control the superheating degree and the supercooling degree of the refrigerant according to the opening degree.

An accumulator16may be provided on a suction side of the compressor11to convert the refrigerant flowing into the compressor11into a gas in a fully gaseous state.

In addition, the outdoor unit10may include an outdoor temperature sensor18to detect a temperature of the outdoor air. At this time, the outdoor temperature sensor18may be provided at any place where the temperature of the outdoor air can be sensed or where the outdoor temperature sensing is required by an operator.

Further, the indoor unit20may include an indoor heat-exchanger21to receive the refrigerant and exchange heat with the indoor air and an indoor fan22to forcedly blow the indoor air by an indoor fan motor15so that heat exchange is performed in the indoor heat-exchanger21.

In addition, among the pipes connected to the indoor heat-exchanger21, an inlet pipe in which the refrigerant is sucked during the cooling operation may be provided with an electronic expansion valve24to expand the refrigerant and an indoor heat-exchanger temperature sensor26to detect a temperature of the inlet pipe of the indoor heat-exchanger21.

In addition, the indoor unit20may further include an indoor humidity sensor27to detect an indoor humidity. The indoor humidity sensor27may detect the relative humidity in the air flowing into the indoor unit20, but is not limited thereto. Therefore, the indoor humidity sensor27may vary according to the needs of the operator. At this time, the indoor humidity sensor27may be provided at any place where the indoor humidity can be sensed or where the indoor humidity sensing is required by an operator.

In addition, the indoor unit20may further include an indoor temperature sensor28to detect a temperature of the indoor air. At this time, the indoor temperature sensor28may be provided at any place where the temperature of the indoor air can be sensed or where the indoor temperature sensing is required by an operator.

FIG. 2is a view illustrating in detail a control block diagram of the air conditioner.

The following description will be made with reference toFIGS. 3 and 4for illustrating a control method of changing the RPM of the indoor fan,FIGS. 5 and 6for illustrating the principle of odor generation, andFIG. 7for illustrating a time of changing the RPM of the indoor fan.

Referring toFIG. 2, the air conditioner100may include an indoor unit110provided with a communicator111, an inputter112, a display113, an indoor fan114, a temperature sensor115, a humidity sensor116, and an indoor-unit controller117.

The air conditioner100may further include an outdoor unit130provided with a communicator131, a storage132, a compressor133, an outdoor fan134, an electronic expansion valve135, a temperature sensor136, and an outdoor-unit controller137.

First, the communicator111may be configured to transmit and receive power and communication signals between the indoor unit110and the outdoor unit130.

The communicators111and131may include one or more components for enabling communication with an external device. For example, the communicators111and131may include at least one of a short-range communication module, a wired communication module, and a wireless communication module.

The short-range communication module may include various kinds of short-range communication modules, such as a Bluetooth module, an infrared communication module, a Radio Frequency Identification (RFID) communication module, a Wireless Local Access Network (WLAN) communication module, a Near Field Communication (NFC) module, a Zigbee communication module, and the like, which transmit/receive signals through a wireless communication network at a short range.

The wired communication module may include various cable communication modules, such as a Universal Serial Bus (USB), a High Definition Multimedia Interface (HDMI), a Digital Visual Interface (DVI), Recommended Standard-232 (RS-232), power line communication, Plain Old Telephone Service (POTS), and the like, as well as various kinds of wired communication modules, such as a Local Area Network (LAN) module, a Wide Area Network (WAN) module, a Value Added Network (VAN) module, and the like.

The wireless communication module may include wireless communication modules supporting various wireless communication methods, such as Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Universal Mobile Telecommunications System (UMTS), Time Division Multiple Access (TDMA), Long Term Evolution (LTE), and the like, as well as a Wireless-Fidelity (Wi-Fi) module, and a Wireless Broadband module.

The inputter112may be a configuration for allowing a user to generate an operation command or to input a set value or the like for controlling the air conditioner100.

The inputter112may include a hardware device, such as various buttons or switches, a keyboard, and the like for a user's input.

Also, the inputter112may include a Graphical User Interface (GUI) such as a touch pad, that is, a software device, for the user's inputs. The touch pad may be implemented as a Touch Screen Panel (TSP), and may be interlayered with the display113.

In the case of the Touch Screen Panel (TSP) having the interlayered with the touch pad, the display113may also be used as the inputter112.

The display113may be a configuration for visually displaying information related to the operation of the air conditioner100such as displaying a set temperature, a current temperature, a current humidity, a cooling mode, a reservation time, a fine dust concentration, and the like.

The display113may be a Cathode Ray Tube (CRT), a Digital Light Processing (DLP) panel, a Plasma Display Panel (PDP), a Light Crystal Display (LCD) panel, an Electro Luminescence (EL) panel, an Electrophoretic Display (EPD) panel, an Electrochromic Display (ECD) panel, a Light Emitting Diode (LED) panel, or an Organic Light Emitting Diode (OLED) panel, but is not limited thereto.

The indoor fan114may be configured to blow the indoor air.

The indoor fan114may forcibly blow the indoor air by the indoor fan motor23(seeFIG. 1) so that heat exchange is performed in the indoor heat-exchanger21(seeFIG. 1).

The indoor fan114may change the RPM of the indoor fan114according to a control signal transmitted from the indoor-unit controller117.

The indoor fan114may be configured with one or more indoor fans. For example, when the applied air conditioner100is the wall-mounted type, the indoor fan114may be one, and when the air conditioner100is the stand type, the indoor fan114may be plural, but is not limited thereto.

The temperature sensor115may include an indoor heat-exchanger temperature sensor to detect the temperature of the indoor heat-exchanger and an indoor temperature sensor to detect the indoor temperature.

As shown inFIG. 1, the indoor heat-exchanger temperature sensor26may be installed at a position to detect the inlet pipe temperature of the indoor heat-exchanger21, but the present disclosure is not limited to these, it is also possible to detect the temperature of the indoor heat-exchanger21at the position other than the inlet of the indoor heat-exchanger21according to the needs of the operator.

In addition, the indoor temperature sensor28(seeFIG. 1) may be installed anywhere the temperature of the indoor air at which the air conditioner100is installed can be detected.

The humidity sensor116may be configured to detect the indoor humidity. The indoor humidity sensor116may be installed anywhere the humidity of the indoor at which the air conditioner100is installed can be detected.

The indoor-unit controller117may change the rotational speed of the indoor fan114to a predetermined time when the compressor133is turned off. At this time, the information related to the operation of the compressor133may be transmitted from the outdoor unit130through the communicator111. At this time, the off the compressor133may be generated when a target temperature is reached (Thermo Off) or when the off command is inputted by the user's operation, but is not limited thereto.

Hereinafter, the case in which the plurality of indoor fans114is provided will be described as an example.

When the compressor133is turned off, the indoor-unit controller117may operate only a predetermined lower indoor fan among the indoor fans114for a first time. When the first time is exceeded, the indoor-unit controller117may operate the plurality of indoor fans114for a second time.

The indoor-unit controller117may operate the lower indoor fan with the minimum RPM when operating only the lower indoor fan.

Referring toFIG. 3, the indoor-unit controller117may operate only the predetermined lower indoor fan114aamong the indoor fans114ato114cat the minimum RPM immediately after the compressor is turned off, to prevent the spread of the odor which may occur due to the evaporation of the condensate remaining in the indoor heat-exchanger21. At this time, the indoor fans114band114cother than the lower indoor fan114amay be maintained in the off state.

The indoor-unit controller117may set the RPMs of the plurality of indoor fans such that the indoor fan disposed at a lower side among the plurality of indoor fans has a greater value of RPM when operating the plurality of indoor fans.

Referring toFIG. 4, the indoor-unit controller117may operate the plurality of indoor fans114ato114cwhen the first time is exceeded, so that the condensate remaining in the indoor heat-exchanger21can be quickly dried. At this time, the indoor-unit controller117may allow the rpm of the indoor fan114located in the lower portion of the indoor fans114ato114cto be larger in consideration of the amount of condensate remaining relatively more in the lower portion of the indoor heat-exchanger21. For example, the indoor-unit controller117may control the size of the rpm as large→medium→small corresponding to one of the indoor fans114a,114b, and114cin order, inFIG. 4.

Referring toFIG. 5, the air conditioner100may generate the odor when the condensate remaining on the surface of the heat-exchanger evaporates after a certain time (for example, about 2 minutes) after the off operation of the compressor (stop of the outdoor unit inFIG. 5).

Referring toFIG. 6, in the dry state, a flux and a coating material, which cause the odor, are in a static state, and in the wet state in which the flux and the coating material combine with the condensate, only a part of the condensate may evaporate. After a drying operation in the air conditioner, the flux and the coating material, which are the cause of the odor may be evaporated together with the condensate, thereby generating the odor. In this case, a point of time when the odor causing factors together with the condensate evaporate due to the drying operation in the air conditioner may be a point of time when the odor occurs inFIG. 5.

The disclosed disclosure may apply the principle of minimizing the amount of evaporation by performing natural drainage to the point of occurrence of maximum natural drainage when the compressor of the air conditioner is turned off, thereby preventing the generation of the odor, and then drying the condensate which is not naturally drained by forced air blowing. That is, in the disclosed disclosure, natural drying is performed until the odor is generated after the compressor is turned off, and after the odor inducing time, active drying is performed by operating the indoor fan so as to completely dry the remaining condensate.

Hereinafter, the case where a single the indoor fan114is provided will be described as an example.

The indoor-unit controller117may operate the indoor fan114for the first time at the minimum RPM when the compressor133is turned off, and operate for the second time with a value larger than the minimum RPM when the first time is exceeded. At this time, the indoor-unit controller117may operate the indoor fan114in a weak wind mode for the first time and operate the indoor fan114in a strong wind mode or a turbo mode for the second time, but is not limited thereto. At this time, the RPM of the indoor fan may be increased from the weak wind mode, the strong wind mode, to the turbo mode. For example, the indoor-unit controller117may drive a mode set to the minimum RPM of the indoor fan during the first time among a plurality of modes based on the RPM of the indoor fan set in the air conditioner100, and may change the mode to a mode other than the mode set to the minimum RPM during the second time.

Meanwhile, the indoor-unit controller117may maintain the indoor fan114in a stop state for the first time when the compressor133is turned off, and may drive the indoor fan114at a predetermined RPM for the second time when the first time is exceeded.

In this case, when a plurality of indoor fans is provided, the indoor-unit controller117may set the RPMs of the plurality of indoor fans such that the indoor fan disposed at a lower side among the plurality of indoor fans has the greater value of RPM when the indoor fan114is operated at the predetermined RPM.

FIG. 7is a view illustrating the amount of drainage per elapsed time.

Referring toFIG. 7, the point at which the natural drainage of the condensate per hour is the maximum (when the fan is in the off state inFIG. 7) may be between two minutes and three minutes. Referring to this, the indoor-unit controller117may control natural drainage rather than the indoor fan114when the natural drainage amount of the condensate is relatively large. In addition, the indoor-unit controller117may set the first time for operating the indoor fan114at the minimum RPM or for stopping the operating to 3 minutes with reference toFIG. 7, although not limited to these.

Table 1 is a table illustrating the results of the odor evaluation at the time of control of the indoor fan in the conventional art (before the change) and the disclosed disclosure (after the change) of the present disclosure, and Table 2 is a table illustrating the description according to the odor intensity. Table 1 shows an example in which only the lower indoor fan of the indoor fans of the first embodiment ofFIG. 8to be described later is operated at the minimum RPM for the predetermined time, and then the plurality of indoor fans are operated.

Table 1 illustrates the evaluation of the odor intensity before and after the change of the six odor evaluation panels (A to F).

As shown in Table 1, it can be confirmed that the present disclosure has an average odor intensity perceived by the user is lowered by 0.8 as compared with the conventional art.

The communicator131may be configured to transmit and receive power and communication signals between the indoor unit110and the outdoor unit130.

The storage132may be configured to store various sets and control information related to the operation of the air conditioner100.

The storage132may be implemented as at least one of a non-volatile memory device (for example, a cache, ROM, PROM, EPROM, EEPROM, and flash memory), a volatile memory device (for example, RAM), or storage medium (for example, HDD and CD-ROM)), although not limited to these. The storage132may be memory implemented as a separate chip from the processor described above in regard of the controller, or the storage device and the processor may be integrated into a single chip.

The compressor133may be configured to compress the refrigerant into the high-temperature high-pressure gaseous refrigerant.

The operation related information including the on or off state of the compressor133may be transmitted to the indoor unit110through the communicator131.

The outdoor fan134may be configured to forcibly blow the outdoor air by the outdoor fan motor15(seeFIG. 1) so that heat-exchange is performed in the outdoor heat-exchanger13(seeFIG. 1).

The outdoor fan134may change the RPM of the outdoor fan132according to the control signal transmitted from the outdoor-unit controller137.

The electronic expansion valve135may be configured to decompress and expand the heat-exchanged refrigerant while adjusting the refrigerant flow rate.

The temperature sensor136may be configured to detect the outdoor temperature. The temperature sensor136may be installed anywhere the temperature of the outdoor air can be detected.

The outdoor-unit controller137may be configured to control the operation of the configuration in the outdoor unit130and may transmit and receive the information for control with the outdoor unit110through the communicator131.

The indoor-unit controller117and the outdoor-unit controller137may be implemented with memory (not shown) to store data for algorithms for controlling the operations of components in the air conditioner100or programs for executing the algorithms, and a processor (not shown) to perform the above-described operations using the data stored in the memory. The memory and the processor may be implemented as separate chips, or integrated into a single chip.

At least one component may be added or deleted corresponding to the performance of the components in the air conditioner100shown inFIG. 2. It will be readily understood by those skilled in the art that the mutual position of the components may be changed corresponding to the performance or structure of the system.

Meanwhile, each component shown in the air conditioner100may implement a hardware component, such as software and/or a Field Programmable Gate Array (FPGA), and an Application Specific Integrated Circuit (ASIC).

FIG. 8is a flowchart illustrating a first embodiment of the air conditioner control method, in which the case of the plurality of indoor fans will be described as an example. At this time, the indoor fans may be vertically arranged, but is not limited thereto.

Referring toFIG. 8, the air conditioner100may perform the cooling operation (210).

Next, when the compressor133(seeFIG. 2) is turned off, the air conditioner100may change and control the RPM of the indoor fan to the predetermined time. At this time, the off operation of the compressor133may be generated when the target temperature is reached (Thermo Off) or when the off command is inputted by the user's operation, although not limited to these.

Particularly, when the compressor133is turned off (220), the air conditioner100may operate only the predetermined lower indoor fan114aof the indoor fans114ato114cofFIG. 3(230) for the first time. For example, the first time may be three minutes, but is not limited thereto.

The air conditioner100may operate the lower indoor fan114aat the minimum RPM when operating only the lower indoor fan114aofFIG. 3. In this case, the minimum RPM implements a smallest RPM among the RPMs of the indoor fans preset in the air conditioner100, and may be changed according to the needs of the operator.

When the first time is exceeded (240), the air conditioner100may operate the plurality of indoor fans (114ato114cofFIG. 4) for the second time (250, and260). At this time, the second time may be 7 minutes, but is not limited thereto.

The air conditioner100may set the RPMs of the plurality of indoor fans (114ato114cofFIG. 4) such that an indoor fan disposed at a lower side among the plurality of indoor fans has the greater value of RPM when operating the plurality of indoor fans (114ato114cofFIG. 4). For example, the air conditioner100may set and control the size of the RPM as large→medium→small corresponding to one of the indoor fans114a,114b, and114c, in order inFIG. 4.

FIG. 9is a flowchart illustrating a second embodiment of the air conditioner control method, in which the case where a single indoor fan114is provided will be described as an example.

Referring toFIG. 9, the air conditioner100may perform the cooling operation (310).

Next, when the operation of the compressor133(seeFIG. 2) is turned off, the air conditioner100may change and control the RPM of the indoor fan to the predetermined time.

Particularly, when the compressor133is turned off (320), the air conditioner100may operate the indoor fan114at the minimum RPM for the first time.

At this time, the air conditioner100may operate the indoor fan114in the weak wind mode for the first time.

Next, when the first time is exceeded (340), the air conditioner100may operate the indoor fan114for the second time with a value larger than the minimum RPM (350, and360).

At this time, the air conditioner100may operate the indoor fan114in the strong wind mode or the turbo mode for the second time. The RPM of the indoor fan may be increased from the weak wind mode, the strong wind mode, to the turbo mode, in order.

FIG. 10is a flowchart illustrating a third embodiment of the air conditioner control method.

Referring toFIG. 10, the air conditioner100may perform the cooling operation (410).

Next, when the compressor133(seeFIG. 2) is turned off (420), the air conditioner100may maintain the indoor fan144(seeFIG. 2) in the stop state for the first time (430).

When the first time is exceeded (440), the air conditioner100may operate the indoor fan114at the predetermined RPM for the second time (450, and460).

When the plurality of the indoor fans114is provided, the air conditioner100may set the RPMs of the plurality of indoor fans such that an indoor fan disposed at a lower side among the plurality of indoor fans has the greater value of RPM when the indoor fan114is operated at the predetermined RPM in step450.

For example, in step450, the air conditioner100may control the plurality of indoor fans at the same RPM, or only a part of the plurality of indoor fans is operated at a minimum RPM for the predetermined time, and then may operate the plurality of indoor fans.

The present disclosure may be implemented during the automatic cleaning after the compressor of the air conditioner is turned off, but is not limited thereto, and it is natural that it is a technique that may be applied according to the turning off of the air conditioner.

As is apparent from the above description, the air conditioner and the method for controlling the same according to the embodiments of the present disclosure can smoothly drain and evaporate the condensate remaining in the indoor heat-exchanger through the control of changing the revolutions per minute of the indoor fan after the compressor is off so that it is possible to prevent the spread of the unpleasant odor which may occur due to evaporation of the condensate.

Meanwhile, the embodiments of the present disclosure may be implemented in the form of recording media for storing instructions to be carried out by a computer. The instructions may be stored in the form of program codes, and when executed by a processor, may generate program modules to perform operation in the embodiments of the present disclosure. The recording media may correspond to computer-readable recording media.

The computer-readable recording medium includes any type of recording medium having data stored thereon that may be thereafter read by a computer. For example, it may be a ROM, a RAM, a magnetic tape, a magnetic disk, a flash memory, an optical data storage device, etc.

The exemplary embodiments of the present disclosure have thus far been described with reference to accompanying drawings. It will be obvious to people of ordinary skill in the art that the present disclosure may be practiced in other forms than the exemplary embodiments as described above without changing the technical idea or essential features of the present disclosure. The above exemplary embodiments are only by way of example, and should not be interpreted in a limited sense.