JP2022030365A - Information processor, program, and information processing method - Google Patents

Abstract

To identify a person that has come in close contact with an object person by a predetermined degree indoors and in underground environment.SOLUTION: An information processor determines a degree of close contact of a second user with a first user in a predetermined region. The information processor includes: a storage part for storing map information in which the region is partitioned into a plurality of areas; a positional information acquisition part for acquiring positional information of a first communication device possessed by the first user, and positional information according to lapse of time of a second communication device possessed by the second user; and a determination part for determining whether or not the first communication device and the second communication device are positioned in the same area for overlap time more than predetermined first time.SELECTED DRAWING: Figure 9

Description

The present invention relates to an information processing apparatus, a program, and an information processing method.

Conventionally, a system for monitoring the position information of a target person has been known.
For example, in the system described in Patent Document 1, when a wandering person to be monitored holds a detected terminal capable of receiving radio waves from a positioning satellite such as a GPS satellite, and the detected terminal leaves the action permission area. Describes a configuration in which the management information associated with the terminal identification information, the terminal position information, and the time information when the terminal position information is obtained is automatically transmitted at predetermined time intervals by short-distance low-speed wireless communication. ing.

Japanese Unexamined Patent Publication No. 2014-7533

By the way, there are cases where it is desired to identify a person who has been close to the target person to a certain degree. For example, people who have been in close proximity to a particular subject with an infection to a certain degree may also be affected, so knowing such a person will prevent the spread of the infection. It is considered to be effective above. However, when using GPS, if a person having a GPS receiver is located indoors or underground, the person cannot be positioned.

Therefore, an object of the present invention is to identify a person who has been in close proximity to a subject to a certain degree in an indoor or underground environment.

One aspect of the present invention is an information processing device that determines the degree of proximity of a second user to a first user within a predetermined area, and is a storage unit that stores map information in which the area is divided into a plurality of areas. When,
A position information acquisition unit that acquires position information according to the passage of time of the first communication device possessed by the first user and the second communication device possessed by the second user, the first communication device, and the above. The second communication device is an information processing device including a determination unit for determining whether or not the second communication device is located in the same area for an overlapping time of a predetermined first time or more.

According to an aspect of the present invention, it is possible to identify a person who has been in close proximity to a subject to a certain degree in an indoor or underground environment.

It is a figure which shows the system configuration of the contact tracking system of 1st Embodiment. It is a plan view of an exemplary floor. FIG. 2 is a diagram showing an example in which a floor is divided into a plurality of areas. FIG. 3 is a diagram in which an exemplary flow line is superimposed on FIG. It is a figure which illustrates the position of the infected person tag and the subject tag on a floor. It is a figure which illustrates the position of the infected person tag and the subject tag on a floor. It is a figure which illustrates the change of the position of the infected person tag and the subject tag on a floor. It is a figure which illustrates the change of the position of the infected person tag and the subject tag on a floor. It is a block diagram which shows the internal structure of each apparatus of the contact tracking system of embodiment. It is a figure which illustrates the data structure of an event database. It is a flowchart which shows the main routine of the contact tracking application program of 1st Embodiment. It is a flowchart which shows the subroutine of the contact tracing application program of 1st Embodiment. It is a flowchart which shows the subroutine of the contact tracing application program of 1st Embodiment. It is a flowchart which shows the subroutine of the contact tracing application program of 1st Embodiment. It is a figure which shows an example of the heat map of the infected person in the contact tracking system of 1st Embodiment. It is a figure explaining the 1st area and the 2nd area in the contact tracking system of 2nd Embodiment. It is a figure which illustrates the change of the position of the mobile tag and the infected person tag on the floor. It is a flowchart which shows the main routine of the contact tracking application program of 2nd Embodiment. It is a flowchart of the subroutine of the contact tracking application program of 2nd Embodiment. It is a flowchart of the subroutine of the contact tracking application program of 2nd Embodiment.

(1) First Embodiment In the following, the contact tracking system 1 will be described as an example of an information processing device that determines the degree of proximity of a second user to a first user within a predetermined area.
In the present embodiment, between a confirmed infected person who has been confirmed to have a predetermined infectious disease (hereinafter, simply referred to as "infected person") and a subject to be inspected for close contact with the infected person. Based on the degree of proximity of the subject, the possibility that the subject has made close contact with the infected person is determined. That is, the infected person is an example of the first user, and the subject is an example of the second user.
The predetermined area is not limited, but may be any indoor place where the infected person and the subject may have stayed together, for example, a floor of an office, a warehouse, a factory, a store, or the like.
In the following description, as an example of a user, an employee who goes in and out of the office of the workplace is mentioned, but is not limited thereto.
The contact tracking system 1 is configured so that each employee has a wireless tag on the floor of the office, thereby acquiring the position data of each employee. The wireless tag is lent to each employee by the user, for example. In the contact tracking system 1, when an infected employee is known, the possibility that a subject who is an employee other than the infected person has made close contact with the infected person is determined based on the position data of each employee. Will be done.

(1-1) System Configuration The schematic system configuration of the contact tracking system 1 of the present embodiment will be described with reference to FIGS. 1 to 4.
FIG. 1 is a diagram showing a system configuration of the contact tracking system 1 of the present embodiment, and includes a part of an exemplary floor F as viewed from the front. FIG. 2 is a plan view of the floor F shown in FIG. In FIGS. 1 and 2, the floor of the floor F is an XY plane, and the height direction is defined as the Z direction. A plurality of shelves SH are arranged on the floor F. The area on the floor F other than the area where the shelf SH is arranged is the area where the employee U can act. It is not essential to arrange the shelf SH on the floor F.

As shown in FIG. 1, the contact tracking system 1 of the present embodiment includes a receiver 3 (locator), a relay device 4, an edge server 5, and an application server 7. In the example shown in FIG. 1, a plurality of receivers 3 are arranged on the ceiling of the floor F.

The receiver 3 and the edge server 5 are communicably connected to each other via the relay device 4, and constitutes a position specifying system for specifying the position of the wireless tag T in the office. The receiver 3 receives a radio wave (beacon signal) radiated by the radio tag T possessed by the employee U moving in the office, and measures the incident angle of the radio wave. The edge server 5 positions the wireless tag T by an AOA (Angle of Arrival) method that specifies the position (position on the XY plane) of the wireless tag T in the office based on the incident angle measured by the receiver 3. In addition, unlike the case of FIG. 1, the receiver 3 may be installed on the back side of the ceiling.
In a non-limiting example, communication between the wireless tag T and the receiver 3 is performed by Bluetooth Low Energy (registered trademark; appropriately abbreviated as "BLE").
The position specifying system sequentially positions the position of the wireless tag T based on the beacon signal received from the wireless tag T possessed by the employee U. The positioning timing is not limited, but is, for example, every several hundred ms from the viewpoint of improving the accuracy of the position data.

The position of the wireless tag T can be estimated by one receiver 3, but it depends on the magnitude of the received signal strength (RSSI) of the beacon signal transmitted from the wireless tag T, the office area, and the radio wave environment of the office. It is preferable to provide many receivers 3 in order to improve the positioning accuracy. The positioning method of the wireless tag T is not limited to the AOA method, and other methods such as the TOA (Time of Arrival) method may be used.

The wireless tag T functions as a BLE tag. At this time, the beacon signal transmitted from the wireless tag T includes a tag ID that identifies the wireless tag T. This tag ID is associated one-to-one with the employee who possesses the wireless tag T. In the position specifying system, the wireless tag T is specified by the tag ID included in the beacon signal. The corresponding tag ID is recorded in the memory built in the wireless tag T.

In the contact tracking system 1 of the present embodiment, the position data of each employee U is managed by dividing the floor F of the office into a plurality of areas.
FIG. 3 shows an example in which the floor F is divided into a plurality of areas in FIG. In the example shown in FIG. 3, areas A-1, ..., A-5, B-1, ..., B-5, C-1, ..., C-5, D-1, ..., Floor F is 5 × 5. , D-5, E-1, ..., E-5. In each of the figures referred to below, as shown in FIG. 3, the area of the shelf is indicated by the alternate long and short dash line.
In FIG. 4, an exemplary flow line FL of the radio tag T is shown on the floor F partitioned by a plurality of areas. In FIG. 4, the circle mark schematically shows the position P where the positioning by the position specifying system was performed.

In the contact tracking system 1 of the present embodiment, an IN event and an OUT event for each area of each employee U are based on the position data of each employee U on the floor F (position data indicated by the position P in FIG. 4). Is detected. The IN event is an event that enters the target area. The OUT event is an event that leaves the target area.
For example, in the example of the position data shown in FIG. 4, an IN event entering the area A5-4, an OUT event leaving the area A5-4, an IN event entering the area A4-4, and an OUT leaving the area A4-4. Each event is detected, such as an event, an IN event entering area A3-4, ..., an IN event entering area A3-2, and so on.
Here, an OUT event and an IN event occur at the same time between adjacent areas. For example, the OUT event leaving the area A5-4 and the IN event entering the area A4-4 are detected at the same time.

Referring to FIG. 1 again, the edge server 5 functions as a part of the position identification system as described above, and obtains the position data of each employee U and the data of the IN event and the OUT event of each employee U. , Record as a database respectively.
The edge server 5 has an area map (an example of map information) that is a basis for detecting an event (IN event or OUT event). The area map is map information of each area exemplified in FIG. 3 (information in which an XY position as a boundary of each area is defined).
As shown in FIG. 1, the edge server 5 and the application server 7 are configured to be communicable via the network NW. The network NW is not limited, but is, for example, a LAN (Local Area Network), a WAN (Wide Area Network), the Internet, or the like.
The edge server 5 has an API (Application Programming Interface) for responding to an inquiry from the application server 7.

A contact tracking application program (hereinafter, abbreviated as "tracking application") is installed in the application server 7.
The tracking application acquires event data (event data) associated with each employee from the edge server 5, and performs determination processing regarding the possibility of close contact with the subject. The determination result by the tracking application can be accessed from, for example, a user terminal (not shown).

(1-2) Example of determining the possibility of close contact with an infected person Next, an example of determining the possibility of close contact with an infected person of a subject will be described with reference to FIGS. 5 to 8.

(A) When the subject and the infected person are located in the same area (Fig. 5)
FIG. 5 shows a case where the infected person tag IT and the subject tags TT1 and TT2 are located in the same area A4-4. Even if the infected person and the subject stay in the same area for a very short time at the same time, there is almost no possibility that the subject will come into close contact with the infected person. However, if the infected person and the subject stay in the same area for some long time at the same time, the subject may have close contact with the infected person. Here, in the contact tracking system 1 of the present embodiment, the possibility of close contact with the infected person is determined based on the time that the infected person and the subject stay in the same area.
In the example of FIG. 5, when the infected person tag IT and the subject tags TT1 and TT2 are located in the same area A4-4 for a time equal to or longer than a predetermined threshold value, the subject corresponding to the subject tags TT1 and TT2 is the infected person tag. It is determined that there is a high possibility of close contact with an infected person corresponding to IT.

(B) When the subject and the infected person are located in adjacent areas (Fig. 6)
FIG. 6 shows a case where the infected person tag IT and the subject tags TT3, TT4, TT5, and TT6 are located in adjacent areas. Staying in an area adjacent to a subject and an infected person is generally considered to be less likely to infect the subject than in the case where the subject and the infected person stay in the same area. However, for example, as shown in the subject tags TT4 and TT5 in FIG. 6, even when the subject is located in an area adjacent to the infected person, the subject may actually be located in a position close to the infected person. be. Therefore, in the contact tracking system 1 of the present embodiment, the possibility of close contact with the infected person is determined even when the infected person and the subject stay in the adjacent area.
In the example of FIG. 6, when the infected person tag IT and the subject tag TT3, TT4, TT5, TT6 are located in the adjacent area for a time equal to or longer than a predetermined threshold value, it corresponds to the subject tag TT3, TT4, TT5, TT6. It is determined that the subject may have been in close contact with the infected person corresponding to the infected person tag IT.

(C) When the subject is located in the area where the infected person was staying (Figs. 7 and 8)
In FIGS. 7 and 8, it is assumed that each tag moves in the order of the states ST1 → ST2 → ST3 → ST4. The infected tag IT is located in area A4-4 in state ST1, moves from there and is located in area A2-4 in state ST2, moves from there and is located in area A2-3 in state ST3, and there. Moved from and left the floor in state ST4.
In the vicinity of the location where the infected person stayed, for example, the infected person touches equipment such as shelves, and the infected person's droplets are released, so the virus may remain even after the infected person leaves the position. There is sex. Therefore, in the contact tracking system 1 of the present embodiment, the area where the infected person stays for a predetermined threshold time or longer is regarded as a contaminated area, and after the infected person moves from the contaminated area to another area, the contaminated area is designated. It is determined that the subject who stayed for the threshold time may have been in close contact with the infected person. That is, the subject is determined for the possibility of close contact based on whether or not he / she stayed in the contaminated area, not on the distance to the infected person.

For example, in the examples shown in FIGS. 7 and 8, the infected person corresponding to the infected person tag IT is determined to have stayed in the areas A4-4, A2-4, A2-3 for a predetermined threshold time or longer, and is contaminated. It is judged to be an area (area with a pattern). It should be noted that the area A3-4 is not determined to be a contaminated area because the infected person only stayed for a short time when moving from the area A4-4 to the area A2-4. Since the subject tags TT7, TT8, TT9, and TT10 are in the contaminated area after the infected person has moved from the contaminated area, there is a possibility of close contact with the infected person if the infected person stays in the contaminated area for a relatively long time. Is determined.

(1-3) Configuration of Each Part of the System Next, with reference to FIGS. 9 and 10, each part of the receiver 3, the edge server 5, and the application server 7 in the contact tracking system 1 of the present embodiment. The internal configuration of is described.
FIG. 9 is a block diagram showing an internal configuration of each device of the contact tracking system 1 of the present embodiment. FIG. 10 is a diagram illustrating the data structure of the event database.

As shown in FIG. 9, the receiver 3 includes a radio wave receiving unit 31, an incident angle measuring unit 32, and a communication unit 33.
The radio wave receiving unit 31 includes an antenna that receives a beacon signal (radio wave) transmitted from the radio tag T.
The incident angle measuring unit 32 measures the incident angle of the radio wave from the radio tag T received by the radio wave receiving unit 31.
The communication unit 33 is an interface for communicating with the wireless tag T and the edge server 5. For example, the communication unit 33 demodulates the received signal from the radio tag T. Further, the communication unit 33 associates the incident angle information measured by the incident angle measuring unit 32 with the tag ID, and transmits the information to the edge server 5 via the relay device 4. The communication between the receiver 3 and the relay device 4 and the communication between the relay device 4 and the edge server 5 may be wired or wireless.

As shown in FIG. 9, the edge server 5 includes a control unit 51, a storage 52, and a communication unit 53.
The control unit 51 is mainly composed of a microprocessor and controls the entire edge server 5 by executing software.
The storage 52 (an example of a storage unit) is a large-scale storage device such as an HDD (Hard Disk Drive), and stores an area map, an event database (event DB), and a location database (location DB).
The communication unit 53 is a communication interface for communicating with the receiver 3 and the application server 7.

When the microprocessor of the control unit 51 executes the position identification module (software), the control unit 51 has the position data according to the passage of time of the radio tag possessed by the infected person and the time of the radio tag possessed by the subject. It functions as a position information acquisition unit to acquire position data according to the progress of.
The control unit 51 identifies the position of the radio tag T based on the information on the incident angle of the beacon signal received from the receiver 3. More specifically, when the AOA method is used, as described above, the known position of the receiver 3 in the office (the position of the three-dimensional coordinates with respect to the predetermined position of the floor) and the receiver 3 Based on the information of the incident angle (arrival direction of radio waves) of the wireless tag T sequentially acquired from, the position of the wireless tag T in the floor (position of the XY coordinates of the floor) according to the passage of time is specified (positioning). do. The positioning interval of the wireless tag T may be arbitrarily set, but is set to a required time (for example, several hundred ms or less) from the viewpoint of improving the accuracy of the position data.
The control unit 51 has, for example, a real-time clock as a timekeeping means. The control unit 51 sequentially records the position data indicating the position of the specified wireless tag T in the position database in association with the information of the time (positioning time) at which the positioning was performed and the tag ID of the wireless tag T.

The processor of the control unit 51 provides an event detection module (software) for detecting an event of the radio tag T in each area of the floor based on the positioning time information, the tag ID, and the position data sequentially recorded in the position database. Execute and record in the event database.

With reference to FIG. 10, an example of data configuration of the event database is shown.
Each record of the event database contains the data of each field of the event occurrence time, the event type, and the area ID for each tag ID. Each record is arranged in the order of event occurrence time. The data in the "Event Type" field indicates an IN event or an OUT event. The data in the "Area ID" field is an area ID (any area defined in FIG. 3) corresponding to the area where the IN event or OUT event has occurred.
From the event database illustrated in FIG. 10, it can be seen that the radio tag with the tag ID: 00028 was located in the area A5-4 between 2020.10.8 13:21:03 and 2020.10.8 13:22:12.

The control unit 51 has an API for responding to an inquiry from the application server 7. When the inquiry specifying the tag ID is received from the application server 7, the API of the control unit 51 refers to the event database of the storage 52 and returns the event data corresponding to the tag ID.

As shown in FIG. 9, the application server 7 includes a control unit 71, a storage 72, and a communication unit 73.
The control unit 71 is mainly composed of a microprocessor and controls the entire application server 7. When the microprocessor executes the tracking application, the control unit 71 functions as a determination unit.
That is, the control unit 71 functions as a determination unit for determining whether or not the infected person tag and the subject tag are located in the same area at an overlapping time equal to or longer than a predetermined threshold time.
The control unit 71 functions as a determination unit for determining whether or not the infected person tag and the subject tag are located in the adjacent area at an overlapping time equal to or longer than a predetermined threshold time.
The control unit 71 departs from the area where the infected person tag is located for a predetermined threshold time or longer (that is, the contaminated area described above), and then the subject tag is located in the contaminated area for a predetermined threshold value or longer. It functions as a determination unit for determining whether or not it is located inside.
The specific processing of the tracking application will be described later.

The storage 72 is a large-scale storage device such as an HDD, and has a determination result database. The control unit 71 records the execution result (determination result for each subject) of the tracking application in the determination result database.
The communication unit 73 functions as a communication interface for communicating with the edge server 5.

(1-4) Processing of Tracking Application Next, processing of the tracking application in the application server 7 will be described with reference to FIGS. 11 to 14. By processing the tracking application, the possibility of close contact with each subject is determined.

FIG. 11 is a flowchart showing the main routine of the tracking application of the present embodiment. Before executing the main routine, it is assumed that the tag ID of the infected person tag is provided to the application server 7 from, for example, a user terminal (not shown). For example, among the tag IDs corresponding to all employees, tag IDs other than the tag ID of the infected person tag correspond to the subject tag.
The tracking application acquires event data corresponding to all infected person tags from the edge server 5 (step S2). That is, the tracking application sends a query including the tag IDs of all infected tags to the API of the edge server 5, and acquires the corresponding event data from the edge server 5.

The tracking application then sequentially executes processing for all subject tags TTj (j = 1, 2, ...). First, the tracking application acquires the event data of the subject tag TTj to be processed from the edge server 5 (step S4), and then the determination process P1 (step S10) and the determination process P2 (step S20) for each infected person tag. , And each process of the determination process P3 (step S30) is performed (step S60). The determination processes P1, P2 and P3 will be described later.
When the processing for all infected person tags is completed (step S60: YES), the tracking application records the judgment result for the subject tag TTj to be processed in the judgment result database (step S62), and the subject tag to be processed at present. If TTj is not the last subject tag (step S64: NO), the process proceeds to the next subject tag.

FIG. 12 is a flowchart showing the determination process P1 (subroutine) of FIG. 11, and corresponds to the determination when the subject and the infected person are located in the same area (see FIG. 5).

In FIG. 12, the tracking application determines whether or not the subject tag TTj to be processed has been in the same area as the infected person tag ITi to be processed based on the event data of each tag (step S11). If there is no time spent in the same area, it is determined that there is no problem (that is, there is no possibility of close contact) (step S12).
On the other hand, when the subject tag TTj has been in the same area as the infected tag ITi (step S11: YES) and the overlapping time in the same area is equal to or longer than the threshold TH1 (an example of the first hour). (Step S13: YES), it is determined that there is a high possibility of close contact (step S14).

FIG. 13 is a flowchart showing the determination process P2 (subroutine) of FIG. 11, and corresponds to the determination when the subject and the infected person are located in the adjacent area (see FIG. 6).

In FIG. 13, the tracking application determines whether or not the subject tag TTj to be processed has been in the area adjacent to the infected person tag ITi to be processed based on the event data of each tag (step S21). If there is no time spent in the adjacent area, it is determined that there is no problem (that is, there is no possibility of close contact) (step S22).
On the other hand, when the subject tag TTj has been in the area adjacent to the infected tag ITi (step S21: YES) and the overlap time of the time in the adjacent area is equal to or longer than the threshold TH2 (an example of the second time). (Step S23: YES), the subject corresponding to the subject tag TTj is determined to have the possibility of close contact with the infected person (step S24). If the overlap time is less than the threshold value TH2 (step S23: NO), it is determined that there is no problem (that is, there is no possibility of close contact) (step S22).
In the determination process P2, the determination in step S24 that "there is a possibility of dense contact" is to determine that the possibility of dense contact is lower than in step S14 of FIG. 12 in the case of being in the same area. Is considered appropriate.

FIG. 14 is a flowchart showing the determination process P3 (subroutine) of FIG. 11, and corresponds to the determination when the subject is located in the area where the infected person was staying (see FIGS. 7 and 8).

In FIG. 14, the tracking application identifies an area where the infected tag ITi to be processed is located for a predetermined time (threshold TH3 (an example of a third time)) or longer. The identified area corresponds to a contaminated area. Although not shown, if the contaminated area is not specified, it is not necessary to perform the determination process P3. In the determination process P3, in the processes after step S32, it is assumed that the contaminated area is specified in step S31.
When a predetermined time (for example, 7 days) has passed since the infected person tag ITi to be processed leaves the area (contaminated area) specified in step S31, the virus existing in the contaminated area is inactivated. It is thought that it is. Therefore, it is considered that the infectivity of the virus attached to the equipment touched by the infected person in the contaminated area has disappeared. Therefore, when a predetermined time has elapsed since the infected person tag ITOi was separated (step S32: YES), it is determined that there is no problem (that is, there is no possibility of close contact) (step S33). If a predetermined time has not elapsed since the infected person tag ITi was separated (step S32: NO), the process proceeds to step S34.
The tracking application determines whether or not the subject tag TTj to be processed is located in the contaminated area after the infected person tag ITi to be processed has left the contaminated area identified in step S31 (step S34). If the subject tag TTj is not located in the contaminated area, it is determined that there is no problem (that is, there is no possibility of close contact) (step S33).
Even if the subject tag TTj is located in the contaminated area, if the staying time in the contaminated area is less than the predetermined threshold value TH4 (step S35: NO), it is determined that there is no problem (step S33).
When the subject tag TTj is located in the contaminated area and its staying time is equal to or longer than the threshold value TH4 (an example of the fourth hour) (step S35: YES), it is determined that there is a possibility of close contact (step S36). ).

In step S13 of the determination process P1 and step S23 of the determination process P2, the overlap time is compared with the threshold value, but the method of determining the overlap time can be any of the following. In each step, either (i) or (ii) determination method may be set individually.
(I) If the overlapping time exists a plurality of times with a non-overlapping time in between, the overlapping time of the multiple times shall be the accumulated time.
(Ii) When the overlapping time exists a plurality of times with a non-overlapping time in between, it is the longest time among the plurality of overlapping times.
(I) is based on the idea that if the remaining time of the virus is long and there are multiple overlapping times, the risk of contact with the virus increases according to the cumulative time of the overlapping times. In (ii), even if there are multiple overlapping times, ventilation is performed during the non-overlapping time, so it is only necessary to consider only the longest remaining time of the virus among the plurality of overlapping times. Based on the idea of.

As described above, in the contact tracking system 1 of the present embodiment, whether or not the time (overlapping time) at which the infected person tag and the subject tag are simultaneously located in the same area is equal to or longer than a predetermined threshold value. Based on, the possibility of close contact with the infected person of the subject is determined. At this time, the position data of the infected person tag and the subject tag, which are the basis of the determination, are individually acquired based on the beacon signal transmitted by each tag. Therefore, it is possible to identify a subject who has been in close proximity to an infected person to a certain degree in an indoor or underground environment.

In the contact tracking system 1 of the present embodiment, it is determined whether or not the infected person tag and the subject tag are located in the adjacent area at an overlapping time equal to or longer than a predetermined threshold time. By evaluating not only the subjects located in the same area as the infected person but also the subjects located in the adjacent area, it is possible to extract all the subjects who may have close contact. In particular, when the subject is in an area adjacent to the infected person but is actually located close to each other across the boundary of the area, it is effective to evaluate the subject located in the adjacent area.

In the contact tracking system 1 of the present embodiment, after the infected person tag leaves the contaminated area, which is the area where the infected person tag is located for a predetermined threshold time or more, the subject tag becomes the predetermined threshold value or more. Determine if it is located within the contaminated area. That is, the possibility of close contact with the subject can be determined based on whether or not the subject stayed in the contaminated area, rather than the distance between the infected person and the subject.

(1-5) Modification Example Hereinafter, a modification of the contact tracking system 1 of the present embodiment will be described.

(Modification 1)
In the first modification, a temperature sensor (an example of a detection unit) for detecting the body temperature of an employee entering the floor F is provided. The edge server 5 can communicate with the temperature sensor.
The control unit 51 of the edge server 5 functions as a user identification unit that identifies an employee whose body temperature is equal to or higher than a predetermined value as an infected person from among the employees based on the employee body temperature data detected by the temperature sensor. ..
In this variant, even if the infected person is not known in advance, it is possible to identify an employee who has a high body temperature and is suspected of being infected, and there is a possibility of close contact with the employee who is suspected of being infected. Can identify other employees who have.

(Modification 2)
In the contact tracking system 1 of the present embodiment, the edge server 5 sequentially records the position data of each employee in the floor in the position database. Therefore, for example, the application server 7 can acquire the position data according to the passage of time of the infected person tag from the edge server 5, and can create a heat map as illustrated in FIG. 15 based on the position data. ..
That is, the control unit 71 of the application server 7 displays a heat map (that is, information indicating the length of stay of the infected person with respect to the position on the floor) based on the position information of the infected person tag according to the passage of time. You may create display data for this purpose. For example, a user terminal (not shown) displays a heat map on the display unit based on the display data created by the application server 7. As a result, the area where the infected person mainly stayed can be specified in the floor F, so that the area can be disinfected intensively.

(2) Second Embodiment Hereinafter, the contact tracking system of the second embodiment will be described with reference to FIGS. 16 to 20. The contact tracking system of the present embodiment may have the same configuration as that of the first embodiment (see FIGS. 1 and 9) except for the matters specified below.

(2-1) Outline of the system The contact tracking system of the present embodiment assumes that an infected person rides on a moving object and moves on the floor, and is a subject who may have close contact with the infected person. Is configured to identify. The moving body is not limited to any one as long as it can move on the floor of a factory or warehouse, and is not limited to an automatic guided vehicle, a forklift or the like equipped with a power mechanism, such as a car or a car. It may be operated by human power such as a trolley.
When the subject rides (stays) on a moving object together with the infected person, the distance between the infected person and the subject continues to be close. Therefore, the contact tracking system of the present embodiment is an infected person under predetermined conditions. At the same time, it is determined that there is a possibility of close contact with the subject who got on the moving body.
In addition, if the infected person has been on the moving object for a predetermined time or longer, it is probable that the infected person has touched the moving object. In that case, it is highly possible that the virus remains in the mobile body and the surrounding area even after the infected person disembarks from the mobile body. Therefore, the contact tracking system of the present embodiment determines that the moving object and the surrounding area are contaminated areas, and certain conditions are applied to the subject who stayed in the contaminated area (for example, the subject who got on the moving object). It is determined below that there is a possibility of close contact.

The system configuration of the contact tracking system of the present embodiment is substantially the same as that of the first embodiment except for the following points.
-A mobile tag, which is a wireless tag, is attached to the mobile. The mobile tag functions as a BLE tag in the same manner as the radio tag T described above. The mobile tag transmits a beacon signal including a tag ID that identifies the mobile tag. The tag ID is associated with an individual mobile.
-The position identification system (that is, the receiver 3 and the edge server 5) positions the moving object moving on the floor based on the beacon signal transmitted from the moving object tag, similar to the wireless tag T possessed by the employee. do. The position data of the mobile tag according to the passage of time is recorded in the position database of the edge server 5.
-The application server 7 acquires the position data of the infected person tag, the subject tag, and the mobile body tag from the edge server 5 via the API of the edge server 5.

(2-2) Outline of Judgment of Possibility of Thick Contact of the present embodiment Next, an outline of determination of the possibility of rich contact of the present embodiment will be described with reference to FIGS. 16 and 17.
In the contact tracking system of the present embodiment, unlike the first embodiment, the floor is not divided into a plurality of areas, and the area is set based on the position of the moving body. Therefore, as the moving body moves on the floor, the area also moves.

FIG. 16 is a diagram illustrating a method of setting an area when the moving body 10 of the present embodiment is viewed in a plan view. In this example, the mobile tag VT is installed near the center of the mobile 10. The first area VA1 is set as a predetermined circular area with reference to the position of the mobile tag VT. The second area VA2 is set as a region outside the first area VA1 with reference to the position of the mobile tag VT.
In the example shown in FIG. 16, it is assumed that the infected person is on the mobile body 10, and the infected person tag IT is located in the first area VA1. It is assumed that the subject corresponding to the subject tag TT2 is riding on the mobile body 10 together with the infected person. The subject corresponding to the subject tag TT1 is located in the first area VA1, and the subject tags TT3 and TT4 are located in the second area VA2.

(A) When the subject and the infected person are located in the first area VA1 Even if the infected person and the subject stay in the same first area VA1 for a very short time at the same time, the subject may come into close contact with the infected person. Is almost nonexistent. However, if the infected person and the subject stay in Area 1 VA1 at the same time for some length of time, the subject may have had close contact with the infected person. Here, in the contact tracking system of the present embodiment, the possibility of close contact with the infected person is determined based on the time that the infected person and the subject stay in the first area VA1.
In the example of FIG. 16, when the infected person tag IT and the subject tags TT1 and TT2 are located in the first area VA1 for a time equal to or longer than a predetermined threshold value, the subject corresponding to the subject tags TT1 and TT2 is the infected person tag IT. It is determined that there is a high possibility of close contact with the infected person corresponding to.

(B) When the subject is located in the second area VA2 The subject's stay in the second area VA2 is generally possible for the subject to be infected as compared with the case where the subject and the infected person stay in the same first area VA1. It is considered to be of low sex. However, for example, as shown in the subject tag TT4 in FIG. 16, even when the subject is located in the second area VA2, the subject may actually be located close to the infected person. Therefore, in the contact tracking system of the present embodiment, the possibility of close contact with the infected person is determined even when the subject stays in the second area VA2 outside the first area VA1.
In the example of FIG. 16, when the infected person tag IT and the subject tags TT3 and TT4 are located in the second area VA2 for a time equal to or longer than a predetermined threshold value, the subject corresponding to the subject tag TT3 and TT4 is the infected person tag IT. It is determined that there is a possibility of close contact with the infected person corresponding to.

(C) When the subject gets on the moving body where the infected person gets off FIG. 17 shows an example in which each tag moves in the order of the states ST1 → ST2 → ST3 → ST4. In FIG. 17, it is assumed that the infected person gets on the moving body 10 and moves, and then gets off and moves to another place. That is, the infected person gets on the mobile body 10 and moves from the state ST1 to the state ST2, whereby the infected person tag IT is continuously located in the first area VA1. In the state ST3, the infected person disembarks from the mobile body 10, and the infected person tag IT moves to the outside of the first area VA1 accordingly. In the state ST4, the subject corresponding to the subject tag TT5 gets on the moving body 10.

In this case, in the mobile body 10 on which the infected person has boarded and the area around it, for example, the infected person touches the equipment of the mobile body 10 and the infected person's droplets are released, so that the infected person leaves the area. The virus may remain after that. Therefore, in the contact tracking system of the present embodiment, when an infected person stays in the first area VA1 for a predetermined threshold time or longer, the first area VA1 is regarded as a contaminated area, and the infected person is separated from the contaminated area. It is determined that the subject who stayed in the contaminated area (first area VA1) for a predetermined threshold time after moving to the area may have been in close contact with the infected person. That is, the possibility of close contact with the infected person is determined based on whether or not the subject stayed in the contaminated area (first area VA1), not based on the distance to the infected person.

For example, in the example shown in FIG. 17, if an infected person stays (boards) in the first area VA1 for a predetermined threshold time or longer before reaching the state ST3, the first area VA1 is regarded as a contaminated area. .. In that case, the subject who entered the first area VA1 after the infected person got off the mobile body 10 (the subject corresponding to the subject tag TT5 in the state ST4) stayed (boarded) in the first area VA1 for a relatively long time. In that case, it is determined that there is a possibility of close contact with the infected person.

In executing the above-mentioned determination, the control unit 71 of the application server 7 of the present embodiment functions as the following area setting unit and determination unit when the microprocessor executes the tracking application.
That is, the control unit 71 functions as an area setting unit for setting a first area in a predetermined range based on the position of the mobile tag attached to the mobile body.
The control unit 71 functions as a determination unit for determining whether or not the infected person tag and the subject tag are located in the first area at overlapping times of a predetermined first time or more.
The control unit 71 is in the second area outside the first area with respect to the position of the mobile tag attached to the mobile body while the infected person tag is located in the first area for the first hour or more. In addition, it functions as a determination unit for determining whether or not a predetermined second time or more overlaps and is located.
The control unit 71 functions as a determination unit for determining whether or not the subject tag is located in the first area for a predetermined third time or more after the infected person tag is located in the first area for the first hour or more.

(2-3) Processing of Tracking Application Next, processing of the tracking application in the application server 7 of the present embodiment will be described with reference to FIGS. 18 to 20. By processing the tracking application, the possibility of close contact with each subject is determined.

FIG. 18 is a flowchart showing the main routine of the tracking application of the present embodiment. Before executing the main routine, it is assumed that the tag ID of the infected person tag is provided to the application server 7 from, for example, a user terminal (not shown). For example, among the tag IDs corresponding to all employees, tag IDs other than the tag ID of the infected person tag correspond to the subject tag.
The tracking application first acquires position data from the edge server 5 for all of the infected tag, the subject tag, and the mobile tag (step S6). That is, the tracking application sends a query including the tag IDs of all tags to the API of the edge server 5, and acquires the corresponding position data from the edge server 5.

The tracking application then sequentially executes processing for all mobile tags VT_k (k = 1, 2, ...). First, the tracking application performs each process of the determination process P4 (step S40) and the determination process P5 (step S50) on the mobile tag VT_k to be processed, and records the determination result in the determination result database (step S65). The determination processes P4 and P5 will be described later.
Steps S40, S50, and S65 are sequentially performed for all mobile tags (step S66: NO).

FIG. 19 is a flowchart showing the determination process P4 (subroutine) of FIG. 18, and corresponds to the contents described with reference to FIG.

In FIG. 19, the tracking application first sets a first area VA1_k around the mobile tag VT_k to be processed (step S41), and determines whether or not the infected person stay period is specified in the first area VA1_k. (Step S42). The period of stay of an infected person means a period of stay in the first area VA1_k to be processed for a period of time or longer when any of the infected person tags becomes a predetermined threshold value. For example, when an infected person rides on a moving body for a certain long time, the period of stay of the infected person is specified in the first area VA1 based on the moving body.
If the period of stay of the infected person is not specified (step S42: NO), since the infected person has not stayed in the mobile body for a certain long period of time, it is not necessary to proceed with the determination process, and the process returns to the main routine.

When the infected person stay period is specified (step S42: YES), the tracking application determines whether or not there is a subject tag located in the first area VA1_k for a predetermined time or more during the infected person stay period. When there is a subject tag satisfying the condition (step S43: YES), it is determined that the subject corresponding to the subject tag has a high possibility of close contact with the infected person (step S44). This corresponds to the case where the subject stays with the infected person at the same time for a predetermined time or more in a relatively narrow first area based on a moving object, such as when the subject rides with the infected person.

If there is no subject tag satisfying the condition in step S43 (step S43: NO), the same processing is performed for the second area outside the first area VA1_k.
That is, the tracking application first sets the second area VA2_k outside the first area VA1_k set in step S41 (step S45), and within the second area VA2_k during the infected person stay period specified in step S42. It is determined whether or not there is a subject tag that has been located for a predetermined time or longer. When there is a subject tag satisfying the condition (step S46: YES), it is determined that the subject corresponding to the subject tag may have close contact with the infected person (step S48). The reason why the judgment in step S48 is judged as "there is a possibility of dense contact" is that it is considered appropriate to judge that the possibility of dense contact is lower than in step S44 when the person is in the same area. Is.
If there is no subject tag satisfying the condition in step S46 (step S46: NO), it is determined that there is no problem for all the subjects (step S47).

In step S43, the time when the subject tag was located in the first area VA1 during the staying period of the infected person was the time when the infected person tag was located in the first area VA1_k and the subject tag was in the first area. It is an overlapping time with the time located in VA1_k.
Similarly, in step S46, the time when the subject tag was located in the second area VA2 during the stay of the infected person is the time when the infected person tag was located in the first area VA1_k and the subject tag was the second. It is an overlapping time with the time located in the area VA2_k.
The method for determining the overlap time can be any of the following from the same concept as in the first embodiment. In each step, either (i) or (ii) determination method may be set individually.
(I) If the overlapping time exists a plurality of times with a non-overlapping time in between, the overlapping time of the multiple times is regarded as the accumulated time.
(Ii) When the overlapping time exists a plurality of times with a non-overlapping time in between, it is the longest time among the plurality of overlapping times.

FIG. 20 is a flowchart showing the determination process P5 (subroutine) of FIG. 18, and corresponds to the case where the subject gets on the moving object where the infected person gets off (see FIG. 17).

In FIG. 20, the tracking application determines whether or not a predetermined time has elapsed after the period of stay of the infected person has elapsed (step S51). When a predetermined time (for example, 7 days, etc.) has elapsed after the period of stay of the infected person, it is considered that the virus existing in the first area VA1_k has been inactivated. Therefore, it is considered that the infectivity of the virus attached to the equipment of the mobile body touched by the infected person in the contaminated area has disappeared. Therefore, if a predetermined time has elapsed after the period of stay of the infected person (step S51: YES), it is determined that there is no problem (that is, there is no possibility of close contact) (step S52). If the predetermined time has not elapsed after the period of stay of the infected person (step S51: NO), the process proceeds to step S53.
In step S53, it is determined whether or not there is a subject tag located in the first area VA1_k for a predetermined time or longer after the lapse of the period of stay of the infected person. This corresponds to, for example, the case where the subject gets on the moving object for a certain long time after the infected person gets off the moving object. In such a case, the first area VA1_k is a contaminated area, and it is considered that the subject may have touched the contaminated equipment of the moving object, for example. Therefore, when there is a subject who satisfies the condition (step S53: YES), it is determined that the subject may have close contact with the infected person (step S54).
On the other hand, when there is no subject satisfying the condition (step S53: NO), it is determined that there is no problem for all the subjects (step S52).

As described above, in the contact tracking system of the present embodiment, the time (overlapping time) at which the infected person tag and the subject tag are simultaneously located in the first area with respect to the moving object becomes a predetermined threshold value. Based on the above, the possibility of close contact with the infected person of the subject is determined. At this time, the position data of the infected person tag, the subject tag, and the mobile body tag, which are the basis of the determination, are individually acquired based on the beacon signal transmitted by each tag. Therefore, it is possible to identify a subject who has been in close proximity to an infected person to a certain degree in an indoor or underground environment.

In the contact tracking system of the present embodiment, during the period when the infected person tag is located in the first area with respect to the mobile body tag (infected person stay period), the subject tag is placed in the second area outside the first area. It is determined whether or not the user has been located in the area for an overlapping time equal to or longer than a predetermined threshold time. By evaluating not only the subjects located in the same area as the infected person but also the subjects located in the adjacent outer area, it is possible to extract all the subjects who may have close contact. In particular, if the subject was in the second area outside the first area but was actually located close to the infected person across the boundary of the area, it would be effective to evaluate the subject in the second area. Become.

In the contact tracking system of the present embodiment, when the infected person tag stays in the first area based on the position of the mobile tag for a predetermined threshold time or longer, the first area is regarded as a contaminated area. Then, after the infected person tag leaves the contaminated area, it is determined whether or not the subject tag is located in the contaminated area for a time or longer that becomes a predetermined threshold value. That is, the possibility of close contact with the subject can be determined based on whether or not the subject stayed in the contaminated area, rather than the distance between the infected person and the subject.

Although a plurality of embodiments of the information processing apparatus, program, and information processing method of the present invention have been described in detail above, the present invention is not limited to each embodiment. Further, each embodiment can be improved or modified in various ways without departing from the spirit of the present invention. For example, the first embodiment and the second modification can be applied to the second embodiment.

For example, the first to fourth hours, which are threshold values, can be appropriately changed or optimized depending on the application to which the present invention is applied.
In addition, a plurality of threshold values can be set to obtain one determination result. For example, in step S13 of the determination process P1 shown in FIG. 12, one-step determination in which the overlap time is compared with the threshold value TH1 is exemplified, but the present invention is not limited to this. It is also possible to set a plurality of threshold values that increase in order and determine the possibility of close contact with the infected person in a plurality of stages based on the comparison result of the overlap time with each of the plurality of threshold values.
Although the example in which the floor is divided in a grid pattern is shown in the first embodiment, it is not limited to the case where each area is divided into a rectangular or square shape. For example, each area may be hexagonal.
In the second embodiment, the case where the outer edges of the first area and the second area are circular with respect to the position of the moving body tag has been illustrated, but the present invention is not limited to this. The shape of the outer edges of the first area and the second area may be hexagonal or octagonal.

In the above-described embodiment, the case where each employee has a wireless tag is illustrated, but the case is not limited to this. If a user terminal such as a smartphone owned by each employee has a function of transmitting a beacon signal according to a predetermined protocol such as BLE, the user terminal may be used instead of the wireless tag.

In the above-described embodiment, as an application example of the information processing apparatus for determining the degree of proximity of the second user to the first user within a predetermined area, a case of determining the degree of proximity of the subject to the infected person has been mentioned. However, the application example is not limited to this.
For example, it can be applied when each player has a wireless tag and plays a tag game in a predetermined enclosed space. In this case, when the player who plays the role of a demon as the first user is close to another player who is the second user for a predetermined time, the game can be configured so that the other player loses.

1 ... Contact tracking system 3 ... Receiver 31 ... Radio wave receiver 32 ... Incident angle calculation unit 33 ... Communication unit 4 ... Relay device 5 ... Edge server 51 ... Control unit 52 ... Storage 53 ... Communication unit 7 ... Application server 71 ... Control unit 72 ... Storage 73 ... Communication unit 10 ... Mobile A1-1 to A5-5 ... Area F ... Floor FL ... Flow line IT ... Infected person tag TT ... Subject tag VT ... Mobile tag VA1 ... First area VA2 ... 2nd area NW ... Network P ... Tag position SH ... Shelf T ... Wireless tag

Claims (11)

An information processing device that determines the degree of proximity of a second user to a first user within a predetermined area.
A storage unit that stores map information in which the area is divided into a plurality of areas,
A position information acquisition unit that acquires position information according to the passage of time of the first communication device possessed by the first user and the second communication device possessed by the second user.
A determination unit for determining whether or not the first communication device and the second communication device are located in the same area at overlapping times of a predetermined first time or more.
Information processing device equipped with. The determination unit determines whether or not the first communication device and the second communication device are located in an adjacent area for an overlapping time of a predetermined second time or more.
The information processing apparatus according to claim 1. The determination unit determines whether or not the second communication device is located in the area for a predetermined fourth time or longer after the first communication device leaves the area where the first communication device is located for a predetermined third time or longer. Judge,
The information processing apparatus according to claim 1 or 2. When the overlapping time of the first communication device and the second communication device exists a plurality of times in the same area with a non-overlapping time in between, the determination unit accumulates the overlapping times of the plurality of times. Judgment based on the time
The information processing apparatus according to claim 1. When the time in which the first communication device and the second communication device overlap in the same area exists a plurality of times with a non-overlapping time in between, the determination unit determines that the time overlaps a plurality of times. Judgment based on the longest time,
The information processing apparatus according to claim 1. When the overlapping time of the first communication device and the second communication device exists a plurality of times in an area adjacent to each other with a non-overlapping time in between, the determination unit determines the overlapping time of the plurality of times. Judgment based on accumulated time,
The information processing apparatus according to claim 2. When the overlapping time of the first communication device and the second communication device exists a plurality of times in an area adjacent to each other with a non-overlapping time in between, the determination unit may perform the overlapping time of the plurality of times. Judgment based on the longest time
The information processing apparatus according to claim 2. A detection unit that detects the body temperature of a plurality of users entering the area,
A user specifying unit that identifies a user whose body temperature is equal to or higher than a predetermined value from the plurality of users as the first user.
The information processing apparatus according to any one of claims 1 to 7. A control unit for creating display data for displaying information indicating the length of stay time of the first user with respect to a position in the area based on the position information of the first communication device according to the passage of time is provided. rice field,
The information processing apparatus according to any one of claims 1 to 8. A computer is used to determine the degree of proximity of the second user to the first user within a given area.
A position information acquisition unit that acquires position information according to the passage of time of the first communication device possessed by the first user and the second communication device possessed by the second user.
With reference to the map information in which the area is divided into a plurality of areas, it is determined whether or not the first communication device and the second communication device are located in the same area for a predetermined first time or more at overlapping times. Judgment unit,
A program to function as. An information processing method for determining the degree of proximity of a second user to a first user within a predetermined area.
The location information of the first communication device possessed by the first user and the location information according to the passage of time of the second communication device possessed by the second user are acquired.
With reference to the map information in which the area is divided into a plurality of areas, it is determined whether or not the first communication device and the second communication device are located in the same area for a predetermined first time or more at overlapping times. do,
Information processing method.

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