KR102497022B1 - System for detecting deviation of object - Google Patents

Abstract

The present invention relates to a system for detecting the departure of an object. A system for detecting departure of an object according to an embodiment of the present invention includes a tag, a reader, and a computer device. The tag transmits an RF signal containing tag identification information. The reader receives the RF signal from the tag. When the magnitude of the received RF signal is greater than the threshold value, the reader decodes the tag identification information. The computer device receives the decoded tag identification information and displays a message informing that the object has departed. When the level of the RF signal received by the reader is greater than the threshold, the computer device displays a message, and when the level of the received RF signal is less than or equal to the threshold, the computer device stops displaying the message. The system for detecting the departure of an object according to the present invention can effectively determine whether an object such as a dementia patient is out of a region.

Description

System for detecting the departure of an object {SYSTEM FOR DETECTING DEVIATION OF OBJECT}

The present invention relates to protection management of an object such as a patient with dementia, and more particularly, to a system for detecting deviation of an object from a specific area.

BACKGROUND OF THE INVENTION With the development of medical technology and the like, human lifespan is increasing. However, with the aging of modern society, the occurrence of senile dementia patients is increasing. Common dementia patients accompany memory impairment. Due to memory impairment, dementia patients forget information related to themselves, such as names and phone numbers. In addition, the sense of direction or spatial perception is significantly reduced. As a result, people with dementia often get lost. If the departure of dementia patients from their home or hospital room is not identified early, the dementia patients may go missing. Caregivers have to endure physical and temporal losses to find dementia patients and furthermore suffer from mental pain.

Accordingly, various methods for determining the location of a patient with dementia have been proposed. As a method for detecting a position, a positioning system for GPS or mobile communication is being provided. However, these systems include expensive equipment. In addition, a location finding service may be provided limited to mobile communication subscribers. The conventional location tracking method can extract the exact coordinates of an object in real time, but its use may be limited due to privacy concerns. Therefore, there is a demand for a location detection method that can effectively manage dementia patients and secure use convenience.

The present invention can provide a system for detecting the departure of an object capable of effectively determining whether an object, such as a patient with dementia, leaves a specific area at low cost.

A system for detecting departure of an object according to an embodiment of the present invention includes a tag, a reader, and a computer device. The tag transmits an RF signal containing tag identification information. The reader may receive an RF signal from the tag. When the magnitude of the received RF signal is greater than the threshold value, the reader may decode the tag identification information.

The computer device may receive the decoded tag identification information and display a message informing that the object has departed. When the magnitude of the received RF signal is greater than the threshold value, the computer device may display a message indicating that the object has deviated. When the magnitude of the received RF signal is less than or equal to the threshold value, the computer device may stop displaying a message indicating that the object has departed.

A system for detecting departure of an object according to an embodiment of the present invention can effectively determine whether an object has departed from a specific area using the received RF signal. A system for detecting departure of an object according to an embodiment of the present invention can quickly and efficiently manage an object such as a dementia patient by using a simplified algorithm.

1 and 2 are block diagrams of a system for detecting departure of an object according to an embodiment of the present invention.
3 to 5 are diagrams for explaining an operating process of a system for detecting departure of an object according to the location of the object.
6 is a flowchart of a method for detecting departure of an object according to an embodiment of the present invention.
7 is a flowchart of a method for detecting departure of an object according to an embodiment of the present invention.

In the following, embodiments of the present invention are described clearly and in detail to the extent that a person skilled in the art can easily practice the present invention.

1 is a block diagram of a system for detecting departure of an object according to an embodiment of the present invention. Referring to FIG. 1 , a system 100 for detecting departure of an object includes a tag 110, a reader 120, and a computer device 130. Tag 110 may be attached to an object. For example, the tag 110 may be attached to a part of a body part of a patient with dementia, such as a wrist, forearm, or shoulder. The tag 110 may transmit an RF signal to the reader 120 . The RF signal may be a signal having a frequency of 300 MHz band.

The RF signal contains tag identification information. The tag identification information may be information unique to the tag 110 attached to the object. For example, tag identification information may include encoded code information different from other tags. The tag 110 may provide the reader 120 with tag identification information loaded on an RF signal. The reader 120 may recognize the tag 110 transmitting the RF signal using the tag identification information. Based on the tag identification information, whether or not the object to which the tag 110 is attached may deviate from the area can be determined.

The tag 110 may include an RFID chip for transmitting tag identification information and an RF signal. Tag identification information may be stored in the RFID chip. In a range in which the reader 120 and the tag 110 can communicate, tag identification information may be provided to the reader 120 by the RFID chip. The tag 110 may further include a tag antenna for transmitting RF signals. The tag 110 may be a passive tag that transmits an RF signal in response to a radio signal received from the reader 120 . Alternatively, the tag 110 may be an active tag that generates power by itself and provides an RF signal to the reader 120 .

The reader 120 receives an RF signal from the tag 110 . The reader 120 may detect tag identification information from the received RF signal. The reader 120 may include a reader antenna for receiving an RF signal. The reader 120 may receive an RF signal from the tag 110 present in the active area. As the distance between the reader 120 and the tag 110 increases, the magnitude of the received RF signal decreases. The active area may be a range in which the reader 120 can receive an RF signal greater than a threshold value. Here, the threshold value may be 0. The activation area may be an area where the safety of an object is secured, such as a hospital room or a home.

The reader 120 may read tag identification information from the tag 110 present in the active area. The reader 120 may not receive an RF signal from the tag 110 existing in the inactive area and may not read tag identification information. The reader 120 may generate tag detection information by decoding tag identification information included in the RF signal received from the tag 110 . Reader 120 provides tag detection information to computer device 130 . The reader 120 may include a decoder for decoding the RF signal.

The reader 120 may periodically receive an RF signal. The reader 120 may periodically read tag identification information. The reader 120 may periodically generate a clock signal for receiving an RF signal. The reader 120 may periodically decode tag identification information and provide tag detection information to the computer device 130 . Accordingly, whether or not the object leaves the active area may be periodically detected.

The reader 120 may include a reader processor for controlling the operation of the reader 120 . For example, a reader processor may control a decoder to generate tag sensing information. The reader 120 may further include a memory. The reader processor may control the memory to store tag identification information or tag detection information. The reader processor may determine whether to decode tag identification information and provide tag detection information to the computer device 130 according to the strength of the RF signal. That is, the activation area may be determined according to the operation of the reader processor. The reader processor may control the reader 120 to periodically receive an RF signal.

The computer device 130 may receive tag detection information from the reader 120 . The computer device 130 may determine whether the tag 110 deviated from the active area based on the tag detection information. When the tag detection information is received, the computer device 130 may determine that the tag 110 is present in the active area. If the tag detection information is not received, the computer device 130 may determine that the tag 110 leaves the active area.

When receiving tag detection information, the computer device 130 may display a message. For example, the computer device 130 may display a message “I'm here”. When the object leaves the activation area, the computer device 130 may not receive tag detection information. In this case, the computer device 130 may stop displaying the message. However, it is not limited thereto, and the computer device 130 may display other messages such as "I'm not here". The guardian may determine whether the object deviated from the active area using the computer device 130 without directly checking the object.

2 is a block diagram of a system for detecting departure of an object according to an embodiment of the present invention. Referring to FIG. 2 , a system 200 for detecting object separation includes a plurality of tags 211 to 21n, a reader 220, a computer device 230, and an alarm generating device 240. Each of the plurality of tags 211 to 21n may have the same configuration as the tag 110 of FIG. 1 . Each of the plurality of tags 211 to 21n may be attached to different objects. For example, n dementia patients may have different tags attached to them. Accordingly, whether or not the plurality of objects leave the active area may be detected.

The reader 220 may receive an RF signal from each of the plurality of tags 211 to 21n. The reader 220 may receive a plurality of tag identification information (ID_1 to ID_n) from the plurality of tags 211 to 21n. The configuration and function of the reader 220 may be the same as that of the reader 120 of FIG. 1 . The reader 220 may determine an active area. The reader 220 may determine whether there are tags in the active area based on the received RF signal level. Tags present in the activation area may provide an RF signal including tag identification information to the reader 220 .

When the first to nth tags 211 to 211n are present in the activation area, the reader 220 receives the first to nth tag identification information ID_1 to ID_n. The reader 220 decodes the first to n th tag identification information (ID_1 to ID_n) to generate tag detection information (TD). The tag detection information (TD) is generated based on tag identification information received from tags existing in the active area. That is, the tag detection information TD may include tag detection information corresponding to tags existing in the active area. When the first to nth tags 211 to 211n are present in the activation area, the tag detection information TD may include the first to nth tag detection information.

The reader 220 does not receive RF signals from tags outside the active area. Alternatively, the reader 220 may receive an RF signal having a magnitude smaller than (or less than or equal to) a threshold value from tags existing outside the active area. When the magnitude of the RF signal received by the reader 220 is less than (or less than) the threshold value, the reader 220 may not decode the tag identification information included in the corresponding RF signal. Alternatively, while the reader 220 decodes the tag identification information, the computer device 230 may not display a message in response to the decoded tag detection information.

The reader 220 may be implemented as an Arduino module. In this case, the reader 220 can be easily implemented at low cost. The system 200 for detecting object separation does not require a complicated algorithm because it determines whether a tag exists in an active area using the magnitude of an RF signal and determines whether an object has departed. The reader 220 and the computer device 230 may exchange information using Arduino serial communication. The reader 220 may provide tag detection information (TD) to the computer device 230 through Arduino serial communication.

The computer device 230 receives tag detection information TD from the reader 220 . If there is no tag present in the activation area, the computer device 230 may not receive the tag detection information TD. When receiving the tag detection information (TD), the computer device 230 may display a message. When the computer device 230 does not receive the tag detection information TD, it may stop displaying the message. The computer device 230 may have the same configuration as the computer device 230 of FIG. 1 and perform the same functions.

Computer device 230 may include processor 231 , memory 232 , and display 233 . The processor 231 may perform a function of a central control unit for the computer device 230 . The computer device 230 may process an operation for detecting a tag assigned to an object. The processor 231 may control to display a message when the tag detection information TD is received. In this case, the processor 231 may provide image data to the display 233 . When the reader 220 is implemented as an Arduino module, the processor 231 may control a message to be periodically displayed on the Arduino serial window. The processor 231 may control to stop displaying the message when the tag detection information TD is no longer received.

The processor 231 may measure the time at which tag detection information TD is not received. For example, the computer device 230 may include a counter for measuring the time at which tag detection information TD is not received. While the tag is present in the activation area, the tag detection information (TD) may be provided to the computer device 230 periodically. The processor 231 may control the counter to count the time when the tag detection information TD is not provided. Alternatively, the processor 231 may control the counter to count the time during which the message is not displayed. If the object returns to the activation area again, the tag is detected and counting is stopped.

The computer device 230 may compare the time at which the tag detection information TD is not provided or the time at which the message is not displayed with a threshold time. The threshold time can be defined as the time at which an object is expected to leave the activation area and get lost. The threshold time may be preset. If the time the object leaves the activation area is longer than the threshold time (or greater than or equal to the threshold time), the computer device 230 may provide the alarm generating device 240 with a departure alarm signal (ALS) for generating an alarm. there is. The processor 231 may control the computer device 230 to generate the departure alert signal ALS.

The memory 232 may store data processed or scheduled to be processed by the processor 231 . For example, such data may include tag detection information (TD), time information at which the tag detection information (TD) is received, or counting information of a counter. The memory 232 may be a volatile memory such as static random access memory (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), or flash memory, phase-change RAM (PRAM), or magneto-resistive RAM (MRAM). ), Resistive RAM (ReRAM), ferro-electric RAM (FRAM), and the like.

The display 233 may receive image data provided from the processor 231 and generate a data voltage based on the image data to display an image. The display 233 may display an ID of a tag, a reception time of tag detection information (TD), and a message based on image data. When the tag detection information TD is received, the message may be a phrase indicating that the object exists in the activation area, such as “I'm in here”. The display 233 may include a liquid crystal display (LCD), an organic light emitting diode (OLED), an active matrix OLED (AMOLED), a flexible display, electronic ink, and the like.

The alert generating device 240 receives the departure alert signal ALS. Illustratively, the alert generating device 240 is illustrated as receiving the departure alert signal ALS from the computer device 230, but is not limited thereto. For example, the departure warning signal ALS may be generated from the reader 220, and the alarm generating device 240 may receive the departure warning signal ALS from the reader 220. In this case, the reader 220 may count the time when the magnitude of the RF signal received from the tag is less than (or less than) the threshold value. If the time when the magnitude of the RF signal is less than (or less than) the threshold is longer than the threshold (or greater than or equal to) the threshold, the reader 220 may provide an ALS to the alert generating device 240. there is.

The alarm generating device 240 is shown as a separate component, but is not limited thereto. For example, the alarm generating device 240 may be included in the reader 220 or may be included in the computer device 230 . When a threshold time elapses after the object leaves the activation area, an alarm may be generated by the alarm generating device 240 . According to the generated alarm, the guardian or the management center can quickly detect the departure of the object and can immediately take measures such as tracking the departed object.

The system 200 for detecting object departure can quickly detect whether or not tagged objects depart from an active area. The system 200 for detecting departure of an object does not extract specific location coordinates of the object. Accordingly, the system 200 for detecting the departure of an object can accurately and reliably determine whether a patient with dementia has gone out without being implemented with a complicated algorithm. The reader 220 is placed in a hospital room or at home. The reader 220 can be efficiently placed in consideration of the structure of a hospital room or home.

3 to 5 are diagrams for explaining an operating process of a system for detecting departure of an object according to the location of the object. Referring to FIGS. 3 to 5 , the system for detecting the departure of an object includes a tag 310 and a reader 320 . Although not shown, the system for detecting the departure of the object further includes a computer device connected to the reader 320 . The tag 310 may have the same configuration as the tag 110 of FIG. 1 or one of the plurality of tags 211 to 21n of FIG. 2 . The reader 320 may have the same configuration as the reader 120 of FIG. 1 or the reader 220 of FIG. 2 . The tag 310 is attached to the object USER. The tag 310 may exist at the same location as the object USER.

The reader 320 receives an RF signal from the tag 310. The reader 320 determines the active areas AA1 and AA2 and the inactive area NAA. The activation areas AA1 and AA2 may be ranges in which the reader 320 can receive RF signals. Alternatively, the activation areas AA1 and AA2 may be ranges in which the magnitude of the RF signal received by the reader 320 is greater than (or greater than) a threshold value. In FIGS. 3 to 5 , the activation areas AA1 and AA2 are illustratively illustrated in circular shapes, but are not limited thereto. The activation areas AA1 and AA2 may be provided in various shapes depending on the structure of the reader antenna or the presence or absence of obstacles around the reader 320 . The activation areas AA1 and AA2 may be ranges in which movement of the object USER is permitted.

The reader 320 may be placed in a home or hospital room. The reader 320 may be placed near a door in a home or a door in a hospital room in order to easily identify the object USER leaving the door. The activation areas AA1 and AA2 may be divided into a first activation area AA1 and a second activation area AA2. The first activation area AA1 may be an area inside a house or a hospital room. The second activation area AA2 may be an area capable of receiving an RF signal outside a home or hospital room. For example, the second activation area AA2 may be a corridor or passage adjacent to a house or a hospital room. The first active area AA1 and the second active area AA2 may be separate areas for convenience.

The object USER may be a person or an animal that needs to detect departure. The object USER may be a person who is easy to get lost, such as a patient with dementia. In addition to a patient with dementia, the object USER may be an infant, a pet, or a patient suffering from a mental illness. That is, the tag 310 may be attached to various objects, and a system for detecting the departure of an object may detect departure of these objects from a specific area.

Referring to FIG. 3 , the object USER and the tag 310 exist in the first activation area AA1. The tag 310 may provide an RF signal including tag identification information to the reader 320 . Since the tag 310 is present in the first active area AA1, the reader 320 receives an RF signal greater than the threshold value. The reader 320 decodes the tag identification information and provides it to the computer device. The computer device displays a message indicating that the object USER exists within the active areas AA1 and AA2 in response to the decoded tag identification information.

Referring to FIG. 4 , the object USER and the tag 310 exist in the second activation area AA2. The tag 310 may provide an RF signal including tag identification information to the reader 320 . Since the tag 310 is present in the second active area AA2, the reader 320 receives an RF signal greater than the threshold value. The reader 320 decodes the tag identification information and provides it to the computer device. The computer device displays a message indicating that the object USER exists within the active areas AA1 and AA2 in response to the decoded tag identification information.

The same message may be displayed when the object USER exists in the first activation area AA1 and when the object USER exists in the second activation area AA2. Unlike this, different messages may be displayed when the object USER exists in the first activation area AA1 and when the object USER exists in the second activation area AA2. For example, the first message may be displayed when the object USER exists in the first activation area AA1, and the second message may be displayed when the object USER exists in the second activation area AA2. can be displayed. The first message may be a phrase indicating that the object USER exists inside the hospital room, etc., and the second message may be a phrase indicating that attention is required since the object USER has left the hospital room.

The reader 320 may compare one threshold value (a first threshold value) for distinguishing the active areas AA1 and AA2 from the inactive area NAA with the magnitude of the RF signal. However, the reader 320 is not limited thereto, and the reader 320 may compare the second threshold for distinguishing the first active area AA1 and the second active area AA2 with the level of the RF signal. As shown in FIG. 3 , when the tag 310 is present in the first activation area AA1 , the level of the RF signal received by the reader 320 may be greater than the second threshold value. At this time, the computer device may display the first message. As shown in FIG. 4 , when the tag 310 is present in the second activation area AA2 , the level of the RF signal received by the reader 320 may be smaller than the second threshold value. At this time, the computer device may display the second message.

Referring to FIG. 5 , the object USER and the tag 310 exist in the inactive area NAA. Since the tag 310 exists in the inactive area NAA, the reader 320 receives an RF signal having a magnitude smaller than the threshold or does not receive an RF signal. The computer device does not receive decoded tag identification information. The computer device may stop displaying the message. Alternatively, the computer device may display a message notifying departure of the object USER.

A system that detects the departure of an object may measure the time the magnitude of the RF signal is below (or below) a threshold value. Alternatively, the system for detecting the departure of the object may measure the time when the decoded tag identification information is not provided to the computer device or the time when the message is not displayed. The measured time can be regarded as a time when the object USER deviated from the activation areas AA1 and AA2. A system that detects the departure of an object may compare the measured time with the threshold time. A system that detects the departure of an object may generate an alert if the measured time is longer than (or is greater than) a threshold time. To generate an alarm, a system for detecting the departure of an object may include an alarm generating device.

6 is a flowchart of a method for detecting departure of an object according to an embodiment of the present invention. The method for detecting departure of an object according to FIG. 6 may be performed by the system 100 for detecting departure of an object of FIG. 1 or the system 200 for detecting departure of an object of FIG. 2 . For convenience of explanation, a method for detecting departure of an object will be described with reference to reference numerals in FIG. 1 . In step S110, the tag 110 and the reader 120 are activated. That is, the tag 110 may transmit an RF signal including tag identification information, and the reader 120 may receive the RF signal.

In step S120, the system 100 for detecting the departure of the object determines whether the tag 110 has left the active area. Specifically, the reader 120 compares the magnitude of the received RF signal with a threshold value. When the magnitude of the received RF signal is greater than (or greater than) the threshold value, the system 100 for detecting the departure of the object determines that the tag 110 is present in the active area. In this case, step S130 proceeds. When the magnitude of the received RF signal is less than or equal to the threshold value (or less than the threshold value), the system 100 for detecting the departure of the object determines that the tag 110 has left the active area. In this case, step S140 proceeds.

In step S130, the system 100 that detects the departure of the object displays a message indicating that the object exists within the activation area. The reader 120 decodes the tag identification information to generate tag detection information. Reader 120 provides tag detection information to computer device 130 . The computer device 130 displays a message in response to the tag detection information. Thereafter, the system 100 detecting the departure of the object performs steps S110 and S120. That is, the system 100 that detects the departure of the object determines whether the tag 110 has departed from the active area again. In step S140, the system 100 that detects the departure of the object stops displaying the message. Reader 120 may not provide tag identification information to computer device 130 . The computer device 130 does not display the message because the tag identification device is not received.

In step S150, the system 100 for detecting the departure of the object compares the departure time with the threshold time. The departure time means the time when the tag 110 leaves the activation area. The system 100 for detecting the departure of an object may calculate the departure time by measuring the time when the magnitude of the RF signal is smaller than the threshold value or by measuring the time when the display of the message is stopped. Step S150 may be performed by the computer device 130 . However, it is not limited thereto, and step S150 may be performed by the reader 120.

If the departure time is less than the threshold time, the system 100 detecting the departure of the object performs step S120 again to determine whether the tag 110 has left the active area. When the tag 110 is within the active area, the tag 110 may provide an RF signal to the reader 120 . That is, since the object returns to the activation area within the threshold time, an alarm is not required. When the departure time passes the critical time, step S160 proceeds. That is, since the object does not return for a certain period of time after leaving the activation area, an urgent action by the guardian or management center is required.

In step S160, the system 100 for detecting the departure of the object generates a departure warning signal. The departure warning signal may be generated by the computer device 130 or may be generated by the reader 120 . The system 100 for detecting the departure of an object may generate an alarm in response to the departure warning signal. The guardian or the management center may determine the departure of the object according to the generated alarm. The guardian or the management center may perform countermeasures such as searching for the location of the object.

7 is a flowchart of a method for detecting departure of an object according to an embodiment of the present invention. The method for detecting departure of an object according to FIG. 7 may be performed by the system 100 for detecting departure of an object of FIG. 1 or the system 200 for detecting departure of an object of FIG. 2 . 7, the object USER exists in the first activation area AA1, the second activation area AA2, and the inactivation area NAA, as shown in FIGS. 3 to 5. It is explained separately for each case. For convenience of explanation, a method for detecting departure of an object will be described with reference to reference numerals in FIG. 1 . In step S210, the tag 110 and reader 120 are activated as in step S110 of FIG.

In step S220, the system 100 detecting the departure of the object determines whether the tag 110 has left the first active area AA1. The reader 120 may compare the magnitude of the RF signal received from the tag 110 with the second threshold. When the magnitude of the RF signal is greater than (or greater than) the second threshold value, the system 100 for detecting the departure of the object may determine that the tag 110 is present in the first active area AA1. In this case, step S230 proceeds. When the magnitude of the RF signal is less than or equal to the second threshold value (or less than the threshold value), the system 100 for detecting the departure of the object may determine that the tag 110 has departed from the first active area AA1. there is. In this case, step S240 proceeds.

In step S240, the system 100 for detecting the departure of the object determines whether the tag 110 has left the second active area AA2. The reader 120 may compare the magnitude of the RF signal received from the tag 110 with a first threshold value. When the magnitude of the RF signal is greater than (or greater than) the first threshold value, the system 100 for detecting the departure of the object may determine that the tag 110 is present in the second active area AA2 . In this case, step S230 proceeds. When the magnitude of the RF signal is less than or equal to the first threshold value (or less than the threshold value), the system 100 detecting the departure of the object causes the tag 110 to leave the first and second activation areas AA1 and AA2. can be judged to have been In this case, step S250 proceeds.

In step S230, the system 100 detecting the departure of the object displays a message. Step S230 may be performed by the computer device 130 . When the tag 110 is present in the first active area AA1 and the second active area AA2, the same message may be displayed. Alternatively, a message displayed when the tag 110 exists in the first active area AA1 and a message displayed when the tag 110 exists in the second active area AA2 may be different from each other. After performing step S230, the system 100 for detecting departure of the object may repeat steps S210 and S220.

In step S250, the system 100 detecting the departure of the object stops displaying the message, similar to step S140 of FIG. In step S260, the system 100 for detecting the departure of the object compares the departure time with the threshold time as in step S150 of FIG. If the departure time is less than the critical time, step S210 is performed again. If the departure time is not less than the threshold time, step S270 proceeds. In step S270, the system 100 for detecting the departure of the object may generate a departure warning signal similarly to step S160 of FIG.

What has been described above are specific examples for carrying out the present invention. The present invention will include not only the above-described embodiments, but also embodiments that can be simply or easily changed in design. In addition, the present invention will also include techniques that can be easily modified and implemented in the future using the above-described embodiments.

100, 211~21n, 310: tag 120, 220, 320: reader
130, 230: computer device

Claims (10)

In the system for detecting the departure of an object,
a tag for transmitting an RF signal including tag identification information about the object;
a reader receiving the RF signal from the tag and generating tag detection information by decoding the tag identification information based on the strength of the received RF signal; and
A computer device for determining whether the object deviated from an active area based on the tag detection information,
The activation area is an area in which the reader receives the RF signal having a magnitude greater than a first threshold value,
The reader:
a reader antenna receiving the RF signal;
a decoder that decodes tag identification information; and
and a reader processor controlling the decoder to decode the tag identification information and generate the tag detection information when the magnitude of the RF signal received by the reader antenna is greater than the first threshold value. According to claim 1,
The tag includes an RFID chip for storing the tag identification information and a tag antenna for transmitting the RF signal;
The system of claim 1, wherein the tag identification information includes encoded code information distinguished from other tags. According to claim 1,
wherein the reader periodically receives the RF signal based on a clock signal to decode the tag identification information. delete According to claim 1,
The active region includes a first active region in which the RF signal received by the reader is greater than the second threshold value and a region in which the RF signal magnitude is less than the second threshold value and greater than the first threshold value. 2 contains the activation region,
The reader processor determines the first activation region and the second activation region by comparing the magnitude of the RF signal with the second threshold value. According to claim 1,
The computer device is:
When the tag detection information is received, it is determined that the object does not leave the active area, and a message is displayed in response to the tag detection information;
When the tag detection information is not received, the system determines that the object has deviated from the active area, and counts the time when the tag detection information is not received. According to claim 6,
The active region includes a first active region in which the RF signal received by the reader is greater than the second threshold value and a region in which the RF signal magnitude is less than the second threshold value and greater than the first threshold value. 2 contains the activation region,
The computer device displays a first message based on determining that the object exists within the first active area, and displays a second message different from the first message based on determining that the object exists within the second active area. system to display. According to claim 6,
The system further comprises an alarm generating device,
wherein the computer device compares the counted time with a threshold time, and provides a departure alert signal to the alert generating device for generating an alert if the counted time is longer than the threshold time. In the system for detecting the departure of a plurality of objects,
A first tag for transmitting a first RF signal including first tag identification information about a first object; and
a plurality of tags including a second tag transmitting a second RF signal including second tag identification information about a second object distinguished from the first tag identification information;
A plurality of tags are received by receiving the first RF signal and the second RF signal, and decoding the first tag identification information and the second tag identification information based on the magnitudes of the first RF signal and the second RF signal. a reader that generates sensing information;
a computer device that determines whether the first object and the second object deviate from an active area based on the plurality of tag detection information; and
An alarm generating device generating a departure alarm based on a determination that the first object or the second object has left the active area,
The activation area is an area in which the reader receives the RF signal having a magnitude greater than a first threshold value,
The reader:
a reader antenna receiving the first RF signal and the second RF signal;
a decoder decoding the first tag identification information and the second tag identification information; and
When the magnitudes of the first RF signal and the second RF signal received by the reader antenna are greater than the first threshold value, the first tag identification information and the second tag identification information are decoded to detect the plurality of tag detection information. and a reader processor controlling the decoder to generate In the method of detecting the departure of an object,
activating the tag and reader;
generating tag detection information by decoding tag identification information included in the RF signal when the magnitude of the RF signal transmitted by the tag is greater than a first threshold;
determining whether the object deviated from an active area based on the tag detection information;
displaying a message in response to the tag detection information when it is determined that the object does not deviate from the active area; and
counting the time for which the tag detection information is not received when it is determined that the object has left the active area, and generating a departure alarm signal when the counted time is longer than a threshold time;
The active area is an area in which the reader receives the RF signal having a magnitude greater than the first threshold value.

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