JP2010277444A - Monitoring system, monitoring device, and monitoring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly keep balance between safety guarantee of a monitored person and privacy protection of the monitored person. <P>SOLUTION: A monitoring system includes a terminal held by a monitored person and a monitoring device which monitors the occurrence of abnormality of the monitored person. The monitoring device determines a degree of risk of the monitored person by referring to a risk level management table which maintains the degree of risk of the monitored person, transmits the degree of risk to the terminal, receives location information transmitted from the terminal, makes a judgement that an abnormality has occurred to the monitored person in case that the location information does not change for a predetermined time period which is set according to the degree of risk, and outputs information on abnormality detection if a judgement is made that an abnormality has occurred. The terminal detects location information, receives the degree of risk, adjusts a degree of accuracy of the location information according to the degree of risk, and transmits the location information with the adjusted degree of accuracy to the monitoring device. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a monitoring system, a monitoring apparatus, and a monitoring method, and more particularly, to a monitoring system, a monitoring apparatus, and a monitoring method for detecting an abnormality of a worker by monitoring position information of a terminal carried by the worker.

  The health management of workers who work in harsh environments such as farms (farms) and factories is important from the viewpoint of improving work efficiency and welfare. For example, in a high temperature environment in agriculture (in the summer, in a greenhouse), there is a risk of heat stroke, a risk of a work accident in case of strong winds or heavy rain. Especially in agriculture, the agricultural workers are aging, so there are many accidents of tractor falling.

  For such a problem, there is a technique for detecting an abnormality of the monitored person by causing the monitored person to carry the terminal and monitoring the current position of the terminal (for example, Patent Document 1).

  However, when anomaly detection is performed by such a method, it is difficult to ensure privacy. That is, there is a concern that the privacy of each person can be easily violated by constantly monitoring information related to personal secrets such as the current position of each person by the system. For example, it is desirable that work and actions other than work (for example, acts such as a break in farm work) be as little as possible.

  Regarding the loss of privacy by monitoring the current position, there is a technique for reducing the accuracy of position information except when necessary, such as when an accident occurs (for example, Patent Document 2).

JP 2008-3992 A JP 2005-50005 A

  However, although the technique described in Patent Document 2 relates to an automobile, it is difficult to detect an operator's abnormality in the same manner as an automobile accident. In other words, it is not only a hindrance to work, but it is inconvenient for the worker to equip the worker with various measuring devices for detecting abnormalities in the human body (for example, measuring devices such as body temperature, pulse and blood pressure). It gives pleasure and is not realistic.

  Then, it is considered that one of the realistic solutions is to detect an abnormality based on the position information of the terminal carried by the worker. In this case, since the information for detecting the abnormality is the position information, there is a problem that the abnormality cannot be properly detected if the accuracy of the position information is lowered after the occurrence of the accident as in Patent Document 2. is there.

  The present invention has been made in view of the above points, and is a monitoring system, a monitoring device, and a device capable of appropriately balancing the safety of the monitored person and the privacy of the monitored person, and The purpose is to provide a monitoring method.

  Accordingly, in order to solve the above-described problem, a monitoring system having a terminal carried by a monitored person and a monitoring device that monitors the presence or absence of the monitored person's abnormality, the monitoring apparatus detects an abnormality for each monitored person. The risk level management table that holds the risk level for the occurrence of an abnormality is referred to, a risk level determination unit that determines the level of risk that an abnormality occurs in the monitored person, and the risk level determined by the risk level determination unit A risk information transmitting unit that transmits to the terminal carried by the monitored person, a position information receiving unit that receives position information transmitted from the terminal, and the position information received by the position information receiving unit However, when there is no change for a predetermined period set in accordance with the degree of risk, an abnormality detection unit that determines that an abnormality has occurred in the monitored person, and an abnormality has occurred in the abnormality detection unit. An output unit that outputs information indicating that an abnormality has been detected, and the terminal is configured to detect the risk transmitted from the position detection unit that detects position information and the risk information transmission unit. A risk information receiving unit to receive, a position information conversion unit that adjusts the accuracy of the position information detected by the position detection unit according to the risk received by the risk information receiving unit, and the position A position information transmission unit that transmits position information, the accuracy of which has been adjusted by the information conversion unit, to the monitoring device.

  It is possible to appropriately achieve a balance between ensuring the safety of the monitored person and ensuring the privacy of the monitored person.

It is a figure which shows the structural example of the worker monitoring system in embodiment of this invention. It is a figure which shows the hardware structural example of the monitoring server in embodiment of this invention. It is a figure which shows the hardware structural example of the worker terminal in embodiment of this invention. It is a sequence diagram for demonstrating the outline | summary of the process sequence of an operator monitoring system. It is a figure which shows the structural example of a risk level management table. It is a figure for demonstrating an example of the conversion process of a positional information. It is a figure which shows the structural example of a positional infomation conversion table. It is a flowchart for demonstrating the process sequence of a risk level determination process. It is a figure which shows the structural example of an environment information storage part. It is a figure which shows the structural example of an operator attribute memory | storage part. It is a figure which shows the structural example of a work information storage part. It is a figure for demonstrating the determination process of the risk level of heat stroke. It is a flowchart for demonstrating the risk level determination process of a tractor fall accident. It is a flowchart for demonstrating the process sequence of the correction process of a risk level. It is a flowchart for demonstrating the process sequence of an abnormality generation detection process. It is a figure which shows the structural example of an abnormality detection judgment table. It is a figure which shows the 2nd structural example of the worker monitoring system in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of an operator monitoring system according to an embodiment of the present invention.

  In the figure, the worker monitoring system 1 includes a monitoring server 10 and one or more worker terminals 20. The monitoring server 10 is a computer that monitors the position of the worker terminal 20 and detects an abnormality of the worker. The worker terminal 20 is a terminal that can be carried by each worker, and mainly transmits position information of the worker terminal 20 to the monitoring server 10 by wireless communication. The worker terminal 20 may be a commercially available mobile phone, PDA (Personal Digital Assistance), or the like, or may be a dedicated terminal.

  In the present embodiment, an example in which the worker monitoring system 1 is applied to an agricultural field (farm) will be described. Therefore, the monitored person is an operator who performs work in the field. However, the application target of the worker monitoring system 1 is not limited to a farm field.

  The monitoring server 10 includes a risk level determination unit 11, a risk level correction unit 12, a risk level transmission unit 13, an abnormality detection unit 14, an environment information storage unit 15, a worker attribute storage unit 16, a work information storage unit 17, and a risk level management. A table 18, an abnormality detection determination table 19, and the like.

  The environment information storage unit 15 is a storage area for storing environment information in the storage device of the monitoring server. The environmental information is input in real time (for example, in real time from various sensors installed on the farm field. Examples of the environmental information include temperature, humidity, rainfall, wind speed, etc. The worker attribute storage unit 16 is monitored. This is a storage area for storing attribute information (worker attribute information) for each worker in the storage device of the server, and examples of the worker attribute information include name, age, past history, etc. The work information storage unit 17 is a storage area for storing information (work information) indicating action contents (work contents such as work schedule) for each worker in the storage device of the monitoring server. An example of the work information is whether or not the tractor is used.The work information is input, for example, every time the work content is determined. It may be input directly from an input device (input device 107, which will be described later) connected to the monitoring server 10, or remotely input from a PC (Personal Computer) connected to the monitoring server 10 via a network. May be.

  The risk level determination unit 11 determines the item of the abnormal state of the worker for each worker based on the environmental information, worker attribute information, work information and the like (hereinafter referred to as “risk level determination information”). For each type (hereinafter referred to as “risk item” or “abnormality type”), the risk level during work is determined. The determined risk level is recorded in the risk level management table 18 for each worker and each risk item. That is, the risk level management table 18 is a table for managing the risk level using the storage device of the monitoring server 10. The risk level is an index indicating the degree of risk (risk level) that an operator will experience an abnormality. Since the content of the environmental information changes every moment, the determination of the risk level is executed repeatedly (for example, periodically). Therefore, the risk level of risk items that depend on dynamically changing information such as environmental information can change over time.

  The risk level correction unit 12 decreases the value of the risk level determined by the risk level determination unit 11 when no abnormality is detected after a predetermined time has elapsed after the determination of the value. The fact that no abnormality is detected even after a predetermined time has elapsed is because it is highly possible that the worker will not be in an abnormal state after that, so it is considered that the risk level may be lowered.

  The risk level transmission unit 13 transmits the maximum value of the risk level determined for each risk item by the risk level determination unit 11 to the worker terminal 20 of the corresponding worker. The abnormality detection unit 14 detects the occurrence of an abnormality related to the worker based on the position information of the worker terminal 20 transmitted from the worker terminal 20 and the abnormality detection determination table 19. When an abnormality is detected, the abnormality detection unit 14 displays on the display device that the abnormality has been detected. The abnormality detection determination table 19 is a table formed in the storage device of the monitoring server 10, and information indicating a determination criterion for determining whether there is an abnormality is registered in advance.

  The worker terminal 20 includes a position information detection unit 21, a risk level reception unit 22, a position information conversion unit 23, a position information transmission unit 24, a position information conversion table 25, and the like.

  The position information detection unit 21 detects information (position information) indicating the position of the worker terminal 20. The risk level receiving unit 22 receives a risk level (risk level related to a worker related to the worker terminal 20) transmitted from the monitoring server 10. The position information conversion unit 23 uses the position information conversion table 25 to adjust (convert) the accuracy of the position information in accordance with the risk level (the position information is converted into position information with higher accuracy as the risk level is higher). . The position information conversion table 25 is a table in which information for converting the accuracy of the position information is registered in the storage device of the worker terminal 20. The position information transmission unit 24 transmits the position information with the accuracy converted by the position information conversion unit 23 to the abnormality detection unit 14.

  FIG. 2 is a diagram illustrating a hardware configuration example of the monitoring server according to the embodiment of the present invention. The monitoring server 10 in FIG. 2 includes a drive device 100, an auxiliary storage device 102, a memory device 103, a CPU 104, a communication interface device 105, a display device 106, and an input device that are connected to each other via a bus B. 107 and a timer 108.

  A program that realizes processing in the monitoring server 10 is provided by a recording medium 101 such as a CD-ROM. When the recording medium 101 on which the program is recorded is set in the drive device 100, the program is installed from the recording medium 101 to the auxiliary storage device 102 via the drive device 100. However, the program need not be installed from the recording medium 101 and may be downloaded from another computer via a network. The auxiliary storage device 102 stores the installed program and also stores necessary files and data.

  The memory device 103 reads the program from the auxiliary storage device 102 and stores it when there is an instruction to start the program. The CPU 104 realizes functions related to the monitoring server 10 according to a program stored in the memory device 103. The communication interface device 105 is used as an interface for connecting to a network. The network is connected to an access point that the worker terminal 20 uses for wireless communication. The display device 106 displays a GUI (Graphical User Interface) or the like by a program. The input device 107 is a keyboard, a mouse, or the like, and is used for inputting various operation instructions. The timer 108 is a so-called timer (clock), and measures time.

  FIG. 3 is a diagram illustrating a hardware configuration example of the worker terminal according to the embodiment of the present invention. In FIG. 3, the worker terminal 20 includes a ROM 201, a nonvolatile RAM 202, a RAM 203, a CPU 204, a communication interface 205, a display device 206, an input device 207, a position detection device 208, and the like.

  A program for executing processing at the worker terminal 20 is installed in the ROM 201 or the nonvolatile RAM 202. For example, when the program is installed in advance at the time of shipment of the worker terminal 20, it is generally stored in the ROM 201. When the program is downloaded and used via the Internet or the like by wireless communication via the communication interface device 205, the program is stored in the nonvolatile RAM 202. In addition to the program, the ROM 201 and the nonvolatile RAM 202 can also store various data used by the program. The RAM 203 stores a program read from the ROM 201 or the nonvolatile RAM 202 when a program activation instruction is issued. The CPU 204 executes a later-described function related to the worker terminal 20 in accordance with a program stored in the RAM 203. The communication interface device 205 includes an antenna and a wireless communication module for performing wireless communication. The display device 206 displays various information output by the program. The input device 207 includes buttons and receives input instructions from the user. The position detection device 208 is a device for detecting the current position of the worker terminal 20, and corresponds to, for example, a GPS receiver that detects a position by receiving radio waves from GPS (Global Positioning System) hygiene. Alternatively, the current position may be detected based on the access point used for wireless communication. Furthermore, the current position may be detected using RFID (Radio Frequency Identification).

  Hereinafter, the processing procedure of the worker monitoring system 1 will be described. FIG. 4 is a sequence diagram for explaining the outline of the processing procedure of the worker monitoring system.

  In step S101, the risk level determination unit 11 of the monitoring server 10 determines the risk level for each worker and each risk item based on the environment information, the worker attribute information, and the work information, and manages the determination result in the risk level management. It outputs to the table 18.

  FIG. 5 is a diagram illustrating a configuration example of the risk level management table. In the figure, the risk level is recorded in the risk level management table 18 for each worker and each risk item. That is, A, B, C, etc. in the column direction indicate worker IDs. The worker ID is an identifier assigned to each worker. Further, heat stroke, cerebral infarction, tractor fall accident, and the like in the row direction are examples of risk items. In the present embodiment, the risk level has four levels of level 0 (no risk), level 1 (low risk), level 2 (medium risk), and level 3 (high risk). However, the expression method of the risk level may be appropriately selected according to the work to which the worker monitoring system 1 is applied. In the last row of the risk level management table 18, the maximum value (maximum risk level) among the risk levels for all risk items is recorded for each worker. That is, the risk level determination unit 11 also determines the maximum risk level for each worker and records it in the risk level management table 18 in step S101.

  Subsequently, the risk level transmission unit 13 transmits the maximum risk level of the worker to the worker terminal 20 of each worker (S102). The identifier (terminal address) of the worker terminal 20 of each worker is registered in the worker attribute storage unit 16 as will be described later. Therefore, the risk level transmission unit 13 transmits the maximum risk level of each worker to the terminal address registered for each worker. The risk level receiving unit 22 of each worker terminal 20 receives the maximum risk level and records it in the RAM 202.

  In the worker terminal 20, when the position information detection unit 21 detects position information (for example, latitude and longitude) of the current position of the worker terminal 20 using the position detection device 208, the position information conversion unit 23 converts the position information into the position information conversion unit 23. (S103). Subsequently, the position information conversion unit 23 converts the input position information, and inputs the position information of the conversion result to the position information transmission unit 24 (S104).

  FIG. 6 is a diagram for explaining an example of position information conversion processing. In the figure, the field F is divided into eight areas (blocks). X1 to x3 attached to the vertical boundary line and y1 to y5 attached to the horizontal boundary line indicate longitude or latitude, respectively. The point P is a position related to the position information detected by the position information detection unit 21. The position information conversion unit 23 converts the position information (latitude and longitude) of the point P into area unit or area unit position information including a plurality of areas according to the maximum risk level recorded in the RAM 202. In the conversion, the position information conversion unit 23 uses the position information conversion table 25.

  FIG. 7 is a diagram illustrating a configuration example of the position information conversion table. In the position information conversion table 25 shown in the figure, the column direction is classified by the range of the position information for each area of the smallest unit in FIG. Row direction is classified by maximum risk level. That is, in the position information conversion table 25, the converted position information (area information) is registered for each position information range and each risk level. For example, the point P is converted into an area A, an area AB, and an area AD according to the maximum risk level of 2, 1, 0. Area AB is an area including areas A and B. The area AD is an area including areas A, B, C, and D. As is clear from the above, the lower the risk level, the lower the accuracy of the converted position information. By reducing the accuracy of the position information when the risk level is low, it is possible to protect the operator's privacy.

  By the way, in FIG. 7, the converted position information is not registered when the risk level is 3. This indicates that the position information is not converted when the risk level is 3. In other words, when the risk level is 3, the risk of occurrence of an abnormality in the worker is very high. Therefore, abnormality detection based on detailed position information can be performed with priority given to the worker's safety over privacy. This is because it is desirable. Therefore, when the position information conversion table 25 is used, the position information conversion unit 23 does not convert position information.

  When conversion is performed, the position information (area information) as a conversion result may be, for example, an identifier (area ID) assigned to each area, or range information of latitude and longitude of each area It may be.

  Subsequently, the position information transmission unit 24 transmits the input position information and the worker ID of the worker carrying the worker terminal 20 to the abnormality detection unit 14 of the monitoring server 10 (S105). The worker ID is recorded in advance in the nonvolatile RAM 203, for example. Subsequently, the abnormality detection unit 14 determines whether or not an abnormality has occurred based on the position information (S106). More specifically, the location information is received repeatedly (eg, periodically). The abnormality detection unit 14 determines that an abnormality has occurred when the position information repeatedly received does not change for a predetermined time.

  In FIG. 4, for the sake of convenience, steps S101 to S106 are described in the order of step numbers. However, each step of FIG. 4 is repeatedly executed asynchronously (independently) in a rectangular unit indicated by a broken line shown in FIG.

  Next, details of step S101 will be described. FIG. 8 is a flowchart for explaining a processing procedure of risk level determination processing.

  In step S <b> 201, the risk level determination unit 11 acquires environment information from the environment information storage unit 15.

  FIG. 9 is a diagram illustrating a configuration example of the environment information storage unit. In the figure, temperature, rainfall, wind speed, etc. are illustrated as environmental information. The environmental information used for determining the risk level may be appropriately selected according to the work content and the like.

  Subsequently, the risk level determination unit 11 acquires worker attribute information and work information for one unprocessed worker from the worker attribute storage unit 16 or the work information storage unit 17 (S202). Here, the unprocessed worker refers to a worker who is not a processing target in the processing of FIG. Therefore, at first, all workers are unprocessed workers.

  FIG. 10 is a diagram illustrating a configuration example of the worker attribute storage unit. In the figure, worker attribute storage unit 16 stores worker attribute information for each worker. The worker attribute information in the figure includes items such as worker ID, name, age, past history, and terminal address. The worker ID is an identifier of the worker. The name is the name of the worker. Age is the age of the worker. The medical history is the history of the worker. The terminal address is identification information (for example, an IP address) for communication regarding the worker terminal 20.

  FIG. 11 is a diagram illustrating a configuration example of the work information storage unit. In the figure, the work information storage unit 17 stores information (work information) indicating the daily work contents for each worker. The work information in the figure includes items such as tractor use and pesticide application. The tractor use is an item indicating whether or not the tractor is used. Agricultural chemical spraying is an item indicating the presence or absence of agricultural chemical spraying work. For each item, not only the presence / absence of work but also work time may be specified. For example, for tractor use, the scheduled use time of the tractor may be registered. Similarly, for the pesticide spraying, the scheduled work time of the pesticide spraying may be registered. The items constituting the work information may be appropriately selected according to the work content and the like.

  The worker from whom the worker attribute information and the work information are acquired in step S201 is hereinafter referred to as “current worker”.

  Subsequently, the risk level determination unit 11 sets an unprocessed risk item as a processing target (S203). For example, among the risk items listed in the risk level management table 18, one risk item that is not a processing target in FIG. 8 is a processing target. Hereinafter, the risk item to be processed is referred to as “current risk item”.

  Subsequently, the risk level determination unit 11 determines the risk level for the current risk item of the current worker, and records the risk level as the determination result in the risk level management table 18 (S204). Subsequently, the risk level determination unit 11 calls the risk level correction unit 12 to start a risk level correction process related to the current risk item of the current worker (S205). Details of steps S204 and S205 will be described later.

  Steps S203 to S205 are repeatedly executed for all risk items (S206). As a result, the risk level of all risk items for the current worker is determined. When processing for all risk items is completed (Yes in S206), the risk level determination unit 11 records the maximum risk level of the current worker in the risk level management table 18 (S207).

  Steps S202 to S207 are repeatedly executed for all workers (S208). As a result, the state of the risk level management table 18 is as shown in FIG. When the processing is completed for all workers (Yes in S208), the processing in FIG. 8 ends. In addition, the process of FIG. 8 is performed regularly, for example. Or it may be executed when the environmental information changes. Furthermore, when the work information includes a time element (that is, when the scheduled work time of each item is specified), the work information may be executed according to the arrival of the scheduled work start time. However, the scheduled start time is different for each worker. Therefore, when the process of FIG. 8 is executed in accordance with the arrival of the scheduled work start time, only the worker who performs the work may be the processing target.

  Next, details of the process of step S204 (risk level determination process) will be described. The contents of the risk level determination process differ for each risk item. This is because the events that affect each risk item differ. For example, in the case of heat stroke, age, temperature (high temperature), and the like can be affected. In the case of cerebral infarction, age, temperature (low temperature), etc. can affect. In the case of a tractor overturning accident, the presence / absence of tractor use, age, rainfall, etc. can affect. In the case of exposure to toxic pesticides, the presence or absence of pesticide spraying work can affect it. Therefore, what kind of event affects each risk item may be examined, and the content of risk level determination processing may be determined based on the examination result. In the present embodiment, an example of risk level determination processing will be described for each risk item of heat stroke and tractor fall accident.

  FIG. 12 is a diagram for explaining the risk level determination process for heat stroke. The heat stroke risk determination table 510 in FIG. 5 is a table in which a risk level is recorded for each combination of temperature and age in the auxiliary storage device 106. When the current risk item is heat stroke, the risk level determination unit 11 applies the age of the current worker and the temperature (current temperature) included in the environmental information to the heat stroke risk determination table 510. To determine the risk level of heat stroke. For example, based on FIG. 12, when the worker's age is 35 years old and the field temperature is 27 ° C., the heat stroke occurrence risk is determined to be level 2. Further, when the temperature of the field subsequently increases and exceeds 30 ° C., the risk level is determined as level 3.

  In addition, you may determine the risk level of heat stroke based only on either one of temperature or age. Alternatively, the risk level of heat stroke may be determined in consideration of other events (parameters). The determination process using the table as shown in FIG. 12 is suitable when the number of events (parameters) affecting the risk item is two or less.

  Further, more complicated calculation algorithms may be used for risk items that can be affected by three or more parameters, such as a tractor fall accident.

  FIG. 13 is a flowchart for explaining risk level determination processing for a tractor overturning accident.

  In step S301, the risk level determination unit 11 initializes the value of the risk level of the tractor fall accident to 0. Subsequently, the risk level determination unit 11 determines whether or not the tractor is scheduled to be used based on the work information of the current worker (S302). If the scheduled use time of the tractor is specified as the work information, it may be determined whether or not the current time (when the process of FIG. 13 is executed) is within the scheduled use time of the tractor. When there is a tractor use schedule (Yes in S302), the risk level determination unit 11 adds 1 to the risk level (S303). Subsequently, the risk level determination unit 11 confirms the age included in the worker attribute information of the current worker (S304). When the current worker is 41 to 50 years old, the risk level determination unit 11 adds 1 to the risk level (S305). When the current worker is 51 years old, the risk level determination unit 11 adds 2 to the risk level (S306). Subsequently, the risk level determination unit 11 confirms the rainfall included in the environmental information (S307). When the rainfall is 20 mm or more (Yes in S307), the risk level determination unit 11 adds 1 to the risk level (S308).

  On the other hand, when there is no plan to use the tractor (No in S302), the steps after S303 are not executed. Therefore, in this case, the risk level is level 0. This is because when the tractor is not used, there is no possibility of the tractor toppling over.

  When the risk level reaches the maximum value (level 3), the risk level value does not increase even if addition is performed on the risk level. Therefore, for example, when steps S303, S306, and S308 are executed, the risk level is level 3.

  For other risk items as well, the risk level may be determined by an appropriate processing procedure based on the influencing parameters.

  Next, details of step S205 in FIG. 8 will be described. FIG. 14 is a flowchart for explaining the processing procedure of the risk level correction processing. The process in FIG. 14 is executed in parallel with the process in FIG. 8 for each worker and each risk item. For example, the risk level correction unit 12 may be activated as a thread or process different from the risk level determination unit 11 every time step S205 is executed. In this case, at the start of step S205, each thread or process started last time may be stopped.

  When called (initiated) in step S205 of FIG. 8, the risk level correction unit 12 acquires the current time from the timer 108 and records the current time in the memory device 103 as the start time (S401). After that, when the abnormality detection unit 14 does not notify the detection of the occurrence of the abnormality (No in S402) and the predetermined time has elapsed from the disclosure time (Yes in S403), the risk level correction unit 12 reads the risk level management table 18. 1 is reduced by 1 (S404). Here, the risk level to be reduced is a risk level for the risk item of the worker corresponding to the risk level correcting unit 12 (the thread or the process). That is, the risk level correction unit 12 executes the process of FIG. 14 in parallel for each worker and each risk level.

  Subsequently, the risk level correction unit 12 determines whether or not the maximum risk level of the worker corresponding to itself has changed due to the decrease in the risk level, based on the risk level management table 18 (S405). When the maximum risk level has changed (Yes in S405), the risk level correction unit 12 causes the risk level transmission unit 13 to transmit a new maximum risk level (S406). The transmission destination of the maximum risk level is the worker terminal 20 of the worker corresponding to the risk level correction unit 12.

  On the other hand, when the occurrence of an abnormality is notified from the abnormality detection unit 14 before the predetermined time has elapsed from the start time (Yes in S402), the processing in FIG. 14 ends. For example, the thread or process as the risk level correction unit 12 ends.

  When the process as shown in FIG. 14 is executed by the risk level correcting unit 12, the risk level is lowered for an operator who does not generate an abnormality for a predetermined time. As a result, the protection level of the worker's privacy can be dynamically and rationally adjusted according to the worker's state.

  A plurality of stages may be provided for a predetermined time, and the risk level may be lowered for each stage. For example, when three stages of 15 minutes, 30 minutes, and 45 minutes are provided, the risk level is lowered every time each time elapses. Thereby, the risk level can be adjusted more finely. However, the risk level does not decrease to a value smaller than 0. The predetermined time may be set via the input device 107 or the like.

  Next, details of step S106 in FIG. 4 will be described. FIG. 15 is a flowchart for explaining a processing procedure of abnormality detection processing. The process in FIG. 5 is executed every time position information or the like is received.

  When the abnormality detection unit 14 receives the position information and the worker ID from the position information transmission unit 24 of a certain worker terminal 20 (S501), the received position information and the worker ID are already recorded in the memory device 103. The position information thus compared is compared to determine whether the worker has moved (S502). Hereinafter, the received position information is referred to as current position information, and the received worker ID is referred to as current worker ID.

  The position information already recorded in the memory device 103 is the position information recorded in the memory device 103 by executing step S503 described later when receiving the previous position information. The position information is initialized (cleared) when the maximum risk level is updated by the risk level determination unit 11 or the risk level correction unit 12. Accordingly, the accuracy of the two pieces of position information compared in step S502 matches. However, the position information in the memory device 103 may not be initialized in accordance with the update of the maximum risk level. In this case, the accuracy of the two pieces of position information compared in step S502 does not necessarily match, and therefore the presence / absence of movement may be determined according to the presence / absence of the inclusion relationship between the two pieces of position information. That is, when there is an inclusion relationship between the two pieces of position information, it may be determined that the movement is not performed.

  If the compared position information does not match (Yes in S502), the abnormality detection unit 14 records the current position information and current worker ID in association with the current time (time information) in the memory device 103, and FIG. This process is terminated (S503). It should be noted that even when the position information is not recorded in the memory device 103 (when the position information is cleared), it is determined that the compared position information does not match. Further, the current time is acquired from the timer 108.

  On the other hand, when the compared position information matches (No in S502), the abnormality detection unit 14 acquires the maximum risk level corresponding to the current worker ID from the risk level management table 18 (S504). Subsequently, the abnormality detection unit 14 acquires an abnormality detection interval corresponding to the maximum risk level from the abnormality detection determination table 19 (S505).

  FIG. 16 is a diagram illustrating a configuration example of an abnormality detection determination table. In the figure, an abnormality detection interval is recorded in the abnormality detection determination table 19 for each maximum risk level. The abnormality detection interval is information indicating how long a time during which the position of the same worker terminal 20 (the same worker) does not change is determined as abnormal. In the example of the figure, the lower the maximum risk level, the longer the abnormality detection interval is set. For example, the abnormality detection interval for level 0 is 120 minutes, and the abnormality detection interval for level 3 is 5 minutes. This is because the lower the maximum risk level, the lower the accuracy of the position information. That is, the lower the accuracy of the position information, the lower the sensitivity of the position information with respect to the actual movement of the operator. Then, for an operator whose maximum risk level is 0, for example, it may be determined that the worker is not moving based on the position information, although the worker is actually moving in the area AD. Therefore, if it is determined whether or not the position information has changed based on a uniform interval without considering the difference in the maximum risk level, occurrence of an abnormality is frequently detected for an operator with a low maximum risk level. Therefore, in this embodiment, in order to eliminate such inconvenience, the abnormality detection interval is lengthened in accordance with the decrease in the accuracy of the position information. In other words, by matching the scale of the position information and the scale of the abnormality detection interval, it is possible to appropriately grasp the occurrence of the phenomenon of worker movement. Thus, for an operator with a high maximum risk level, an abnormality can be detected at an early stage by increasing the accuracy of the position information and shortening the time interval for determining the presence or absence of a position change. For workers with a low maximum risk level, the occurrence of abnormalities is frequently detected while protecting privacy by lowering the accuracy of location information monitoring and increasing the time interval for judging whether there is a change in location. It is preventing. Note that the abnormality detection interval for level 0 may be 0 or empty (a state that is not specified). In this case, the abnormality detection unit 14 does not execute the processes after step S506. Therefore, no abnormality is detected.

  Subsequently, the abnormality detection unit 14 determines whether or not a time corresponding to the abnormality detection interval has elapsed from the time indicated by the time information recorded in the memory device 103 for the current worker ID (S506). . That is, it is determined whether or not the time indicated by the timer 108 at the present time has passed the time obtained by adding the abnormality detection interval to the time indicated by the time information recorded in the memory device 103 for the rent worker ID. .

  When the time corresponding to the abnormality detection interval has elapsed (Yes in S506), the abnormality detection unit 14 detects that an abnormality has occurred in the risk level correction unit 12 corresponding to the current worker ID, and the current worker ID. Is notified (S507). Subsequently, the abnormality detection unit 14 acquires a name corresponding to the worker ID from the worker attribute storage unit 16, and displays a message or a screen indicating that an abnormality has occurred in the worker with the name on the display device 106. (S508).

  By the way, the conversion of the accuracy of the position information is not necessarily executed by the worker terminal 20. For example, it may be executed by a computer (hereinafter referred to as “position information conversion device”) such as a PC (Personal Computer) installed at a position where the worker terminal 20 and the monitoring server 10 are relayed.

  FIG. 17 is a diagram illustrating a second configuration example of the worker monitoring system according to the embodiment of the present invention. In FIG. 17, the same parts as those in FIG.

  In the worker monitoring system 2 in FIG. 1, the location information conversion device 30 includes a risk level receiving unit 22, a location information conversion unit 23, a location information transmission unit 24, and a location information conversion table 25. In addition, the worker terminal 20 a includes a position information detection unit 21. The position information detection unit 21 transmits the detected position information to the position information conversion unit 23 of the position information conversion device 30.

  That is, in the worker monitoring system 2, the position information conversion device 30 converts the accuracy of the position information of the worker terminal 20a. According to such a configuration, the positional information conversion device 30 can consolidate the conversion processing of the accuracy of the positional information regarding the plurality of worker terminals 20a. As a result, the processing load on each worker terminal 20a is reduced, and even a terminal with scarce resources can be used as the worker terminal 20a. Further, maintenance work for the position information conversion table 25 and the like can be simplified.

  Note that the function (position information conversion function) of the position information conversion device 30 can be implemented in the monitoring server 10. However, in this case, raw position information (position information whose accuracy is not adjusted) regarding the worker terminal 20a is input to the monitoring server 10. Then, by changing the configuration of the monitoring server 10, the administrator or the like can obtain the positional information before the accuracy conversion. In view of such a point, it is desirable that the position information function is implemented outside the monitoring server 20.

  As described above, according to the worker monitoring system 1 in the present embodiment, the accuracy of the position information notified to the monitoring server 10 is adjusted according to the risk level of the worker. More specifically, position information with high accuracy is notified to an operator with a high risk level, and position information with low accuracy is notified to an operator with a low risk level. In other words, priority is given to the detection of abnormality based on highly accurate positional information for workers with a high risk level, and priority is given to ensuring privacy for workers with a low risk level. Therefore, it is possible to appropriately achieve a balance between ensuring the worker's safety and ensuring the privacy.

  The risk level is determined for each risk item (abnormal state type), and the maximum value is used for adjusting the accuracy of the position information. That is, the position information is adjusted based on the risk item having the highest risk among the plurality of risk items. Therefore, it is possible to appropriately ensure the safety of the worker.

  In the above description, the accuracy of the position information has been described with respect to the accuracy (that is, spatial ambiguity) of the worker terminal 20 with respect to the actual position. However, the meaning of the accuracy of position information is not limited to this. For example, the accuracy of the position information changes depending on the difference in the interval (notification interval) at which the worker terminal 20 notifies the monitoring server 10 of the position information. That is, when the notification interval is long, the accuracy of the position information is lower than when the notification interval is short. This is because the ambiguity with respect to the passage of time of position information increases due to the increase in the notification interval. Therefore, the conversion of position information accuracy includes not only spatial ambiguity adjustment, but also ambiguity adjustment over time.

  Specifically, the position information conversion unit 23 may make the position information notification interval longer as the risk level becomes lower. However, the notification interval corresponding to the risk level needs to be shorter than the abnormality detection interval managed for each risk level in the abnormality detection determination table 19. Otherwise, it is always mistaken for an abnormality.

  As described above, the specific position information to be notified of accuracy according to the risk level varies depending on the situation and is not necessarily fixedly determined.

  In the present embodiment, the example in which the worker in the farm field is the monitored person has been described, but the monitoring target by the worker monitoring system 1 or 2 is not limited to the worker in the farm field. For example, it may be a construction site worker or a salesperson. Further, the monitored person is not limited to the person engaged in the work. For example, the worker monitoring system 1 or 2 may be applied in the fields of education (school etc.), medical care (hospital etc.), or welfare. That is, the monitored person of the worker monitoring system 1 or 2 may be a person who may be abnormal when the state of not moving continues to some extent.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to such specific embodiment, In the range of the summary of this invention described in the claim, various deformation | transformation・ Change is possible.

Regarding the above description, the following items are further disclosed.
(Appendix 1)
A monitoring system having a terminal carried by a monitored person and a monitoring device for monitoring the presence or absence of abnormality of the monitored person,
The monitoring device
A risk level determination unit that refers to a risk level management table that holds a risk level at which an abnormality occurs for each monitored person, and that determines a risk level at which an abnormality occurs in the monitored person;
A risk information transmitting unit that transmits the risk determined by the risk determination unit to the terminal carried by the monitored person;
A position information receiving unit for receiving position information transmitted from the terminal;
An abnormality detection unit that determines that an abnormality has occurred in the monitored person when the position information received by the position information reception unit does not change during a predetermined period set according to the degree of risk;
An output unit that outputs information indicating that an abnormality has been detected when it is determined that an abnormality has occurred in the abnormality detection unit;
The terminal
A position detector for detecting position information;
A risk information receiving unit for receiving the risk transmitted from the risk information transmitting unit;
A position information converter that adjusts the accuracy of the position information detected by the position detector according to the risk received by the risk information receiver;
A monitoring system comprising: a position information transmitting unit that transmits position information, the accuracy of which has been adjusted by the position information converting unit, to the monitoring device.
(Appendix 2)
The abnormality detection unit sets a shorter period as the risk level is higher as the predetermined period, and the position information conversion unit adjusts the accuracy of the position information to be higher as the risk level is higher. The monitoring system according to supplementary note 1, characterized by:
(Appendix 3)
The monitoring device includes a risk correction unit that reduces the risk of the monitored person when the abnormality detection unit determines that an abnormality has occurred in the monitored person for a predetermined period of time,
The monitoring system according to appendix 1 or 2, wherein the risk information transmitting unit transmits the risk reduced by the risk correcting unit to the terminal carried by the monitored person.
(Appendix 4)
The risk level management table holds, for each monitored person, a risk of occurrence of abnormality for each of a plurality of abnormality types, and each risk is updated based on a change in predetermined risk determination information. thing,
The risk determination unit determines the risk for each type of abnormality of the monitored person; and
The risk level information transmission unit transmits the highest risk level among the risk levels determined for each type of abnormality for the monitored person to the terminal carried by the monitored person. The monitoring system according to any one of supplementary notes 1 to 3.
(Appendix 5)
A monitoring system having a terminal carried by a monitored person, a monitoring device for monitoring the presence or absence of abnormality of the monitored person, and a position information conversion device,
The monitoring device
A risk level determination unit that refers to a risk level management table that holds a risk level at which an abnormality occurs for each monitored person, and that determines a risk level at which an abnormality occurs in the monitored person;
A risk level information transmission unit that transmits the risk level determined by the risk level determination unit to the position information conversion device;
A location information receiving unit that receives the location information of the terminal, transmitted from the location information conversion device;
An anomaly detector that determines that an anomaly has occurred in the person carrying the terminal when the position information received by the position information receiver does not change for a predetermined period set according to the degree of risk; ,
An output unit that outputs information indicating that an abnormality has been detected when it is determined that an abnormality has occurred in the abnormality detection unit;
The terminal
A position detector for detecting position information;
A position information transmission unit that transmits the position information detected by the position detection unit to the position information conversion device;
The position information conversion device includes:
A risk information receiving unit for receiving the risk transmitted from the risk information transmitting unit of the monitoring device;
A position information receiving unit that receives the position information transmitted from the terminal;
A position information conversion unit that adjusts the accuracy of the position information received by the position information receiving unit according to the degree of risk received by the risk information receiving unit;
A monitoring system comprising: a position information transmitting unit that transmits position information, the accuracy of which has been adjusted by the position information converting unit, to the monitoring device.
(Appendix 6)
A monitoring device that monitors presence or absence of abnormality of the monitored person based on position information of the terminal transmitted from a terminal carried by the monitored person,
A risk level determination unit that refers to a risk level management table that holds a risk level at which an abnormality occurs for each monitored person, and that determines a risk level at which an abnormality occurs in the monitored person;
A position information receiving unit for receiving position information transmitted from the terminal;
A position information conversion unit that adjusts the accuracy of the position information received by the position information receiving unit according to the risk determined by the risk determination unit;
An abnormality detection unit that determines that an abnormality has occurred in the monitored person when the position information whose accuracy has been adjusted in the position information conversion unit does not change for a predetermined period set according to the degree of risk;
An output unit that outputs information indicating that an abnormality has been detected when it is determined that an abnormality has occurred in the abnormality detection unit;
And a monitoring device.
(Appendix 7)
A monitoring method executed by a monitoring system having a terminal carried by a monitored person and a monitoring device for monitoring the presence or absence of abnormality of the monitored person,
The monitoring device
A risk determination procedure for determining a risk of occurrence of an abnormality in the monitored person with reference to a risk level management table holding a risk of occurrence of an abnormality for each monitored person;
A risk information transmission procedure for transmitting the risk determined in the risk determination procedure to the terminal carried by the monitored person;
A location information reception procedure for receiving location information transmitted from the terminal;
An abnormality detection procedure for determining that an abnormality has occurred in the monitored person when the position information received in the position information reception procedure does not change for a predetermined period set according to the degree of risk;
When it is determined that an abnormality has occurred in the abnormality detection procedure, an output procedure for outputting information indicating that an abnormality has been detected is executed,
The terminal
A position detection procedure for detecting position information;
A risk information receiving procedure for receiving the risk transmitted in the risk information transmitting procedure;
A position information conversion procedure for adjusting the accuracy of the position information detected in the position detection procedure according to the risk received in the risk information receiving procedure;
A monitoring method for executing a position information transmission procedure for transmitting position information, the accuracy of which has been adjusted in the position information conversion procedure, to the monitoring device.
(Appendix 8)
A monitoring method executed by a monitoring system having a terminal carried by a monitored person, a monitoring device that monitors whether the monitored person is abnormal, and a position information conversion device,
The monitoring device
A risk determination procedure for determining a risk of occurrence of an abnormality in the monitored person with reference to a risk level management table holding a risk of occurrence of an abnormality for each monitored person;
A risk information transmission procedure for transmitting the risk determined in the risk determination procedure to the position information converter;
A location information receiving procedure for receiving location information of the terminal, transmitted from the location information conversion apparatus;
An abnormality detection procedure for determining that an abnormality has occurred in a monitored person carrying the terminal when the position information received in the position information reception procedure does not change for a predetermined period set according to the degree of risk; ,
When it is determined that an abnormality has occurred in the abnormality detection procedure, an output procedure for outputting information indicating that an abnormality has been detected is executed,
The terminal
A position detection procedure for detecting position information;
Performing the position information transmission procedure for transmitting the position information detected in the position detection procedure to the position information conversion device;
The position information conversion device includes:
A risk information receiving procedure for receiving the risk transmitted in the risk information transmitting procedure of the monitoring device;
A location information reception procedure for receiving the location information transmitted from the terminal;
A location information conversion procedure for adjusting the accuracy of the location information received in the location information reception procedure according to the risk received in the risk information reception procedure;
A monitoring method for executing a position information transmission procedure for transmitting position information, the accuracy of which has been adjusted in the position information conversion procedure, to the monitoring device.
(Appendix 9)
A monitoring method executed by a monitoring device that monitors presence or absence of abnormality of the monitored person based on position information of the terminal transmitted from a terminal carried by the monitored person,
A risk determination procedure for determining a risk of occurrence of an abnormality in the monitored person with reference to a risk level management table holding a risk of occurrence of an abnormality for each monitored person;
A location information reception procedure for receiving location information transmitted from the terminal;
A position information conversion procedure for adjusting the accuracy of the position information received in the position information reception procedure according to the risk determined in the risk determination procedure;
An abnormality detection procedure for determining that an abnormality has occurred in the monitored person when the position information whose accuracy has been adjusted in the position information conversion procedure does not change for a predetermined period set according to the degree of risk,
An output procedure for outputting information indicating that an abnormality has been detected when it is determined that an abnormality has occurred in the abnormality detection procedure;
And a monitoring method.
(Appendix 10)
On the computer,
A risk determination procedure for determining a risk of occurrence of an abnormality in the monitored person with reference to a risk level management table holding a risk of occurrence of an abnormality for each monitored person;
A position information receiving procedure for receiving position information transmitted from a terminal carried by the monitored person;
A position information conversion procedure for adjusting the accuracy of the position information received in the position information reception procedure according to the risk determined in the risk determination procedure;
An abnormality detection procedure for determining that an abnormality has occurred in the monitored person when the position information whose accuracy has been adjusted in the position information conversion procedure does not change for a predetermined period set according to the degree of risk,
An output procedure for outputting information indicating that an abnormality has been detected when it is determined that an abnormality has occurred in the abnormality detection procedure;
A program to execute and.

DESCRIPTION OF SYMBOLS 1 Worker monitoring system 10 Monitoring server 11 Risk level determination part 12 Risk level correction part 13 Risk level transmission part 14 Abnormality detection part 15 Environment information storage part 16 Worker attribute storage part 17 Work information storage part 18 Risk level management table 19 Abnormality Detection determination table 20 Worker terminal 21 Position information detection unit 22 Risk level reception unit 23 Position information conversion unit 24 Position information transmission unit 25 Position information conversion table 100 Drive device 101 Recording medium 102 Auxiliary storage device 103 Memory device 104 CPU
105 Communication Interface Device 106 Display Device 107 Input Device 108 Timer 201 ROM
202 Nonvolatile RAM
203 RAM
204 CPU
205 Communication Interface 206 Display Device 207 Input Device 208 Position Detection Device B Bus

Claims (9)

A monitoring system having a terminal carried by a monitored person and a monitoring device for monitoring the presence or absence of abnormality of the monitored person,
The monitoring device
A risk level determination unit that refers to a risk level management table that holds a risk level at which an abnormality occurs for each monitored person, and that determines a risk level at which an abnormality occurs in the monitored person;
A risk information transmitting unit that transmits the risk determined by the risk determination unit to the terminal carried by the monitored person;
A position information receiving unit for receiving position information transmitted from the terminal;
An abnormality detection unit that determines that an abnormality has occurred in the monitored person when the position information received by the position information reception unit does not change during a predetermined period set according to the degree of risk;
An output unit that outputs information indicating that an abnormality has been detected when it is determined that an abnormality has occurred in the abnormality detection unit;
The terminal
A position detector for detecting position information;
A risk information receiving unit for receiving the risk transmitted from the risk information transmitting unit;
A position information converter that adjusts the accuracy of the position information detected by the position detector according to the risk received by the risk information receiver;
A monitoring system comprising: a position information transmitting unit that transmits position information, the accuracy of which has been adjusted by the position information converting unit, to the monitoring device.   The abnormality detection unit sets a shorter period as the risk level is higher as the predetermined period, and the position information conversion unit adjusts the accuracy of the position information to be higher as the risk level is higher. The monitoring system according to claim 1, wherein: The monitoring device includes a risk correction unit that reduces the risk of the monitored person when the abnormality detection unit determines that an abnormality has occurred in the monitored person for a predetermined period of time,
The monitoring system according to claim 1 or 2, wherein the risk information transmitting unit transmits the risk reduced by the risk correcting unit to the terminal carried by the monitored person. The risk level management table holds, for each monitored person, a risk of occurrence of abnormality for each of a plurality of abnormality types, and each risk is updated based on a change in predetermined risk determination information. thing,
The risk determination unit determines the risk for each type of abnormality of the monitored person; and
The risk level information transmission unit transmits the highest risk level among the risk levels determined for each type of abnormality for the monitored person to the terminal carried by the monitored person. The monitoring system according to any one of claims 1 to 3. A monitoring system having a terminal carried by a monitored person, a monitoring device for monitoring the presence or absence of abnormality of the monitored person, and a position information conversion device,
The monitoring device
A risk level determination unit that refers to a risk level management table that holds a risk level at which an abnormality occurs for each monitored person, and that determines a risk level at which an abnormality occurs in the monitored person;
A risk level information transmission unit that transmits the risk level determined by the risk level determination unit to the position information conversion device;
A location information receiving unit that receives the location information of the terminal, transmitted from the location information conversion device;
An anomaly detector that determines that an anomaly has occurred in the person carrying the terminal when the position information received by the position information receiver does not change for a predetermined period set according to the degree of risk; ,
An output unit that outputs information indicating that an abnormality has been detected when it is determined that an abnormality has occurred in the abnormality detection unit;
The terminal
A position detector for detecting position information;
A position information transmission unit that transmits the position information detected by the position detection unit to the position information conversion device;
The position information conversion device includes:
A risk information receiving unit for receiving the risk transmitted from the risk information transmitting unit of the monitoring device;
A position information receiving unit that receives the position information transmitted from the terminal;
A position information conversion unit that adjusts the accuracy of the position information received by the position information receiving unit according to the degree of risk received by the risk information receiving unit;
A monitoring system comprising: a position information transmitting unit that transmits position information, the accuracy of which has been adjusted by the position information converting unit, to the monitoring device. A monitoring device that monitors presence or absence of abnormality of the monitored person based on position information of the terminal transmitted from a terminal carried by the monitored person,
A risk level determination unit that refers to a risk level management table that holds a risk level at which an abnormality occurs for each monitored person, and that determines a risk level at which an abnormality occurs in the monitored person;
A position information receiving unit for receiving position information transmitted from the terminal;
A position information conversion unit that adjusts the accuracy of the position information received by the position information receiving unit according to the risk determined by the risk determination unit;
An abnormality detection unit that determines that an abnormality has occurred in the monitored person when the position information whose accuracy has been adjusted in the position information conversion unit does not change for a predetermined period set according to the degree of risk;
An output unit that outputs information indicating that an abnormality has been detected when it is determined that an abnormality has occurred in the abnormality detection unit;
And a monitoring device. A monitoring method executed by a monitoring system having a terminal carried by a monitored person and a monitoring device for monitoring the presence or absence of abnormality of the monitored person,
The monitoring device
A risk determination procedure for determining a risk of occurrence of an abnormality in the monitored person with reference to a risk level management table holding a risk of occurrence of an abnormality for each monitored person;
A risk information transmission procedure for transmitting the risk determined in the risk determination procedure to the terminal carried by the monitored person;
A location information reception procedure for receiving location information transmitted from the terminal;
An abnormality detection procedure for determining that an abnormality has occurred in the monitored person when the position information received in the position information reception procedure does not change for a predetermined period set according to the degree of risk;
When it is determined that an abnormality has occurred in the abnormality detection procedure, an output procedure for outputting information indicating that an abnormality has been detected is executed,
The terminal
A position detection procedure for detecting position information;
A risk information receiving procedure for receiving the risk transmitted in the risk information transmitting procedure;
A position information conversion procedure for adjusting the accuracy of the position information detected in the position detection procedure according to the risk received in the risk information receiving procedure;
A monitoring method for executing a position information transmission procedure for transmitting position information, the accuracy of which has been adjusted in the position information conversion procedure, to the monitoring device. A monitoring method executed by a monitoring system having a terminal carried by a monitored person, a monitoring device that monitors whether the monitored person is abnormal, and a position information conversion device,
The monitoring device
A risk determination procedure for determining a risk of occurrence of an abnormality in the monitored person with reference to a risk level management table holding a risk of occurrence of an abnormality for each monitored person;
A risk information transmission procedure for transmitting the risk determined in the risk determination procedure to the position information converter;
A location information receiving procedure for receiving location information of the terminal, transmitted from the location information conversion apparatus;
An abnormality detection procedure for determining that an abnormality has occurred in a monitored person carrying the terminal when the position information received in the position information reception procedure does not change for a predetermined period set according to the degree of risk; ,
When it is determined that an abnormality has occurred in the abnormality detection procedure, an output procedure for outputting information indicating that an abnormality has been detected is executed,
The terminal
A position detection procedure for detecting position information;
Performing the position information transmission procedure for transmitting the position information detected in the position detection procedure to the position information conversion device;
The position information conversion device includes:
A risk information receiving procedure for receiving the risk transmitted in the risk information transmitting procedure of the monitoring device;
A location information reception procedure for receiving the location information transmitted from the terminal;
A location information conversion procedure for adjusting the accuracy of the location information received in the location information reception procedure according to the risk received in the risk information reception procedure;
A monitoring method for executing a position information transmission procedure for transmitting position information, the accuracy of which has been adjusted in the position information conversion procedure, to the monitoring device. A monitoring method executed by a monitoring device that monitors presence or absence of abnormality of the monitored person based on position information of the terminal transmitted from a terminal carried by the monitored person,
A risk determination procedure for determining a risk of occurrence of an abnormality in the monitored person with reference to a risk level management table holding a risk of occurrence of an abnormality for each monitored person;
A location information reception procedure for receiving location information transmitted from the terminal;
A position information conversion procedure for adjusting the accuracy of the position information received in the position information reception procedure according to the risk determined in the risk determination procedure;
An abnormality detection procedure for determining that an abnormality has occurred in the monitored person when the position information whose accuracy has been adjusted in the position information conversion procedure does not change for a predetermined period set according to the degree of risk,
An output procedure for outputting information indicating that an abnormality has been detected when it is determined that an abnormality has occurred in the abnormality detection procedure;
And a monitoring method.

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