JP5233940B2 - Mobile terminal, monitoring system, and program - Google Patents

Description

  The present invention relates to a mobile terminal, a monitoring system, and a program, and more particularly, to a mobile terminal, a monitoring system, and a program for a monitored person to monitor the position and detect an abnormality of the monitored person.

  Monitoring the behavior of field workers at farm work sites, factories, etc. is important in order to understand the health and work conditions of workers. For example, it is possible to determine whether or not an abnormality has occurred in a worker by grasping position information of a worker who performs work in a harsh environment such as a farm (farm) or a factory. It is also considered to monitor the progress of work from the locus of the position information of the worker. The worker's position information is grasped by, for example, GPS (Global Positioning System).

  On the other hand, worker monitoring based on position information can be a problem in relation to protection of worker privacy. In other words, it is a legitimate act to take a break or go to the toilet during work hours as long as it is within the allowable range in the work rules. For an operator, it is not pleasant to monitor the current position until a break or the like.

  In view of this, it has been proposed that the detailed level of the position information to be notified is registered in advance according to the notification partner and the time zone, and the detailed level of the position information is changed based on the registered information (for example, patents). Reference 1).

International Publication No. 06/070877 Pamphlet

  However, if the detail level of the location information is changed, the detailed current location can be concealed, but it is assumed by the other party that it is taking a private action by sending location information with a low detail level. There is a problem of Teshima. For example, if the position information notified to the manager is low-level information regarding the worker at the work site such as a farm work site or factory, the administrator may not be able to grasp the exact current position of the worker. It is possible to guess that the person is taking a break or going to the bathroom.

  The present invention has been made in view of the above points, and provides a mobile terminal, a monitoring system, and a program capable of making it difficult to estimate the behavior of a monitored person by changing the accuracy of position information. With the goal.

  Therefore, in order to solve the above-described problem, the position information detection unit is a portable terminal carried by the monitored person, and the position information detection unit that detects the position information and the position information that receives the instruction of the first period for converting the accuracy of the position information A conversion instruction receiving unit, a position information conversion period selecting unit for selecting a second period for converting the accuracy of the position information, and position information for converting the accuracy of the position information in the first period and the second period Position information for transmitting position information whose accuracy has been converted by the position information conversion section, and position information for periods other than the first period and the second period detected by the position information detection section And a transmission unit.

  According to the disclosed technique, it is possible to make it difficult to estimate the behavior of the monitored person by changing the accuracy of the position information.

It is a figure which shows the structural example of the worker monitoring system in 1st embodiment. 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 flowchart for demonstrating the process sequence which an operator terminal performs. 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 figure which shows the example of the positional information transmitted from a worker terminal. It is a flowchart for demonstrating the process sequence which a monitoring server performs according to reception of a positional information. It is a flowchart for demonstrating the process sequence which a monitoring server performs according to reception of conversion period information. It is a figure which shows the function structural example of the monitoring server in 2nd embodiment. It is a figure which shows the structural example of a risk level management table. It is a flowchart for demonstrating the process sequence of the determination process of a risk level and a random parameter. 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 figure which shows the modification of an operator monitoring system.

  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 the first embodiment.

  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 the worker, and mainly transmits position information of the worker terminal 20 to the monitoring server 10 by wireless communication. As the worker terminal 20, a commercially available mobile phone, PDA (Personal Digital Assistance), or the like may be used, or a dedicated terminal may be used.

  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 worker terminal 20 includes a position information detection unit 21, a position information conversion unit 22, a position information conversion instruction reception unit 23, a position information conversion period selection unit 24, a position information transmission unit 25, a conversion period information communication unit 26, and position information. It has a conversion table 27 and the like. Each of these units is realized by processing that a program installed or incorporated in the worker terminal 20 causes the CPU of the worker terminal 20 to execute.

  The position information detection unit 21 detects information (position information) indicating the position of the worker terminal 20. The position information is detected or calculated based on radio waves from a GPS (Global Positioning System) satellite, for example. The position information conversion unit 22 converts (adjusts) the accuracy of the position information using the position information conversion table 27. Specifically, the position information conversion unit 22 degrades or reduces the accuracy of the position information detected by the position information detection unit 21. Hereinafter, when the position information detected by the position information detection unit 21 and the position information after conversion by the position information conversion unit 22 are distinguished, the former is referred to as “high-accuracy position information” and the latter is referred to as “low-accuracy position information”. " The position information conversion table 27 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 conversion instruction receiving unit 23 receives an instruction input for starting or ending the conversion of position information from the operator, and requests the position information conversion unit 22 to start or end the conversion of position information. The instruction input may be input by pressing a hardware button of the worker terminal 20 or may be input via a screen displayed on the display unit of the worker terminal 20 by the work information conversion instruction receiving unit. Also good. The position information conversion unit 22 performs position information conversion in a period from when a position information conversion start request is input from the position information conversion instruction receiving unit 23 to when a position information conversion end request is input. The position information conversion instruction accepting unit 23 may use schedule information or the like previously recorded in the storage device of the worker terminal 20 as an input source of the position information conversion instruction. The schedule information indicates, for example, a period (start time and end time) in which position information is converted. A plurality of periods may be specified.

  The position information conversion period selection unit 24 randomly (randomly) selects a period for converting position information (at the start and end of conversion). The position information conversion period selection unit 24 inputs a position information conversion start request to the position information conversion unit 22 at the start of a randomly selected period, and receives the position information conversion end request at the end of the period. Input to the unit 22. The position information conversion unit 22 performs position information conversion in a period from when the position information conversion start request is input from the position information conversion period selection unit 24 to when the position information conversion end request is input. That is, the position information conversion period selection unit 24 converts the position information in a period unrelated to the operator's intention. The random selection may be targeted only at the start of the period for converting the position information, but it is desirable that the length of the period is also targeted. When the length of the period is fixed, regularity occurs in the low-accuracy position information based on the position information conversion period selection unit 24, and the monitoring server indicates that the low-accuracy position information is based on the position information conversion period selection unit 24. This is because it can be discriminated at 10. In the present embodiment, the position information conversion period selection unit 24 determines the timing for starting the period for converting the position information based on, for example, an exponential distribution having an average occurrence interval for the period. Further, the position information conversion period selection unit 24 determines the length of the period based on an exponential distribution having an average duration for the period. However, as long as the randomness can be ensured, the method for determining the start timing and the length of the period is not limited to a predetermined one.

  A period in which the position information is converted based on the position information conversion instruction receiving unit 23 (that is, according to an arbitrary designation by the worker) is referred to as an “arbitrary conversion period”. A period during which position information is converted based on the position information conversion period selection unit 24 is referred to as a “random conversion period”. Further, when the arbitrary conversion period and the random conversion period are not distinguished, they are simply referred to as “conversion period”.

  The position information transmission unit 25 continuously transmits the position information to the monitoring server 10. The position information transmission unit 25 transmits high-accuracy position information outside the conversion period, and transmits low-accuracy position information during the conversion period.

  The conversion period information communication unit 26 transmits to the monitoring server 10 information indicating the length of the arbitrary conversion period or the length of the random conversion period in a predetermined period (for example, the period from the start of work to the end of the day). To do.

  On the other hand, the monitoring server 10 includes a position information reception unit 111, a state determination unit 112, a conversion period information reception unit 113, a conversion period information output unit 114, an operator attribute storage unit 115, and the like. Each of these units is realized by a process that a program installed in the monitoring server 10 causes the CPU of the monitoring server 10 to execute.

  The position information receiving unit 111 receives position information transmitted from the position information transmitting unit 25 of each worker terminal 20. The state determination unit 112 determines the presence / absence of an abnormality (disease, accident, etc.) of the worker based on the received change in position information. For example, when there is no change in the position indicated by the position information for a certain period (that is, when the worker is not moving), the state determination unit 112 determines that some abnormality has occurred in the worker. When it is determined that an abnormality has occurred, the state determination unit 112 outputs (for example, displays) information indicating the occurrence of the abnormality. The worker attribute storage unit 115 is a storage area for storing attribute information (worker attribute information) for each worker in the storage device of the monitoring server 10. Examples of worker attribute information include worker ID, name, age, and the like. The worker ID is an ID (identifier) for identifying each worker. The worker attribute information is input in advance.

  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 is a button or the like and receives an input instruction 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 flowchart for explaining a processing procedure executed by the worker terminal.

  In step S101, the position information detection unit 21 detects high-accuracy position information (for example, latitude and longitude) of the current position of the worker terminal 20 using the position detection device 208 (S101). The position information detection unit 21 inputs the detected high-accuracy position information to the position information conversion unit 22. Subsequently, the position information conversion unit 22 determines whether or not the current time is the conversion period (S102).

  For example, when taking a break or going to the toilet, the worker inputs an instruction to start conversion of position information to the worker terminal 20 via the input device 207. The instruction is detected by the position information conversion instruction receiving unit 23 and input to the position information conversion unit 22. In addition, the worker inputs an instruction to end the conversion of the position information to the worker terminal 20 at the end of the break or when returning from the toilet. The instruction is detected by the position information conversion instruction receiving unit 23 and input to the position information conversion unit 22. The position information conversion unit 22 recognizes a period from when the start instruction is input to when the end instruction is input as an arbitrary conversion period.

  In addition, the position information conversion period selection unit 24 inputs a position information conversion start request to the position information conversion unit 22 at random timing, and sends a position information conversion end request to the position information conversion unit 22 at random timing. input. The position information conversion unit 22 recognizes a period from when the start request is input to when the end request is input as a random conversion period.

  When the current time is an arbitrary conversion period or a random conversion period (Yes in S102), the position information conversion unit 22 converts the high-accuracy position information input from the position information detection unit 21 into the low-accuracy position information. The position information is input to the position information transmission unit 25 (S103).

  FIG. 5 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 indicated by the high-accuracy position information detected by the position information detection unit 21. The position information conversion unit 22 converts the position information (latitude and longitude) of the point P into area unit position information. In the conversion, the position information conversion unit 22 uses the position information conversion table 27.

  FIG. 6 is a diagram illustrating a configuration example of the position information conversion table. As shown in the figure, in the position information conversion table 27, corresponding low-accuracy position information (area in FIG. 5) is registered for each range of the high-accuracy position information. The range of the high-accuracy position information is indicated by the coordinate values of the upper left vertex and the lower right vertex of each area. Note that the low-accuracy position information (area information) as the conversion result may be, for example, an identifier (area ID) assigned to each area, or may be range information of latitude and longitude of each area. .

  On the other hand, when the current time is neither an arbitrary conversion period nor a random conversion period (No in S102), the position information conversion unit 22 does not convert the position information, and directly sends the high-accuracy position information to the position information transmission unit 25. input.

  Subsequently, the position information transmission unit 25 transmits the low-accuracy position information or the high-accuracy position information and the worker ID input from the position information conversion unit 22 to the monitoring server 10 (S104). The worker ID is recorded in the nonvolatile RAM 203, for example.

  Steps S101 to S104 are repeatedly executed (ie, periodically) at regular intervals in a predetermined period. The fixed time is preferably as short as possible from the viewpoint of the operator's abnormality detection.

  For example, when the predetermined period ends (Yes in S105), the conversion period information communication unit 26 indicates information indicating the length (time) of the arbitrary conversion period or the length (time) of the random conversion period within the predetermined period ( Conversion period information) and worker ID are transmitted to the monitoring server 10 (S106). Here, the predetermined period may be, for example, one day of work time, or each of an morning work period and an afternoon work period with a lunch break interposed therebetween. Alternatively, a shorter period may be used. In any case, the timing needs to be asynchronous (unrelated) to the random conversion period. If the timing of information transmission by the conversion period information communication unit 26 is always the end timing of the random conversion period, the monitoring side can distinguish between the random conversion period and the arbitrary conversion period. This is because the significance of the existence of the random conversion period is lost.

  Note that the position information conversion unit 22 records at least one of the information indicating the length of the arbitrary conversion period or the random conversion period in the RAM 202. However, the length of the arbitrary conversion period can be determined by the position information conversion instruction receiving unit 23, and the length of the random conversion period can be determined by the position information conversion period selecting unit 24. Therefore, information indicating the length of the arbitrary conversion period or the random conversion period may be recorded in the RAM 202 by the position information conversion instruction receiving unit 23 or the position information conversion period selecting unit 24. The conversion period information communication unit 26 uses information recorded in the RAM 202 as a transmission target.

  The end of the predetermined period may be detected by an input by the operator via the input device 207, or may be automatically detected when the end time of the predetermined period is reached. Alternatively, step S106 may be executed in response to a request from the monitoring server 10.

  With the processing in FIG. 4, the position information transmitted from the worker terminal 20 is as shown in FIG. 7, for example. FIG. 7 is a diagram illustrating an example of position information transmitted from the worker terminal.

  Each arrow in (A) in the figure indicates position information detected by the position information detection unit. It is shown that the positional information is periodically detected by arranging the arrows at regular intervals. A thick arrow in (B) indicates low-accuracy position information generated by conversion in an arbitrary conversion period. In the figure, an example is shown in which a conversion instruction is input twice by an operator. A thick arrow in (C) indicates low-accuracy position information generated by conversion in a random conversion period. In the figure, an example in which the random conversion period occurs four times is shown. Note that the interval of each random conversion period is determined based on an exponential distribution having an average occurrence interval T1 and an exponential distribution having an average duration T2. (D) indicates position information transmitted from the position information transmitting unit 25. (D) is a conceptual synthesis of (A), (B), and (C). As a result, the monitoring server 10 can specify the time when the low-accuracy position information is received, but cannot specify the arbitrary conversion period. Therefore, it is difficult to specify the time when the worker actually took a break or went to the toilet. As a result, the operator's privacy can be appropriately protected.

  Subsequently, a processing procedure executed in the monitoring server 10 will be described. FIG. 8 is a flowchart for explaining a processing procedure executed by the monitoring server in response to reception of position information.

  When the position information receiving unit 111 receives the position information and the worker ID from a certain worker terminal 20, the position information receiving unit 111 inputs the received position information and the worker ID to the state determining unit 112 (S201). Subsequently, the state determination unit 112 compares the received position information with the position information already recorded in the memory device 103 with respect to the received worker ID, and determines whether the worker has moved (S202). ). The position information already recorded in the memory device 103 is the position information recorded in the memory device 103 by executing step S203 described later when receiving the previous position information. Hereinafter, the position information received this time is referred to as current position information, and the worker ID received this time is referred to as current worker ID.

  The presence or absence of the movement of the operator is determined based on whether or not the position information to be compared matches. When the accuracy of the position information to be compared is different, that is, when the high-accuracy position information and the low-accuracy position information are compared, the presence / absence of movement may be determined based on the presence / absence of the inclusion relationship between the two position information. That is, when the position indicated by the high-accuracy position information is included in the area indicated by the low-accuracy position information, it may be determined that the movement is not performed. Alternatively, the position information used for determining the presence or absence of movement may be limited to high-accuracy position information. In this case, step S202 and subsequent steps need only be executed when high-accuracy position information is received.

  If the compared position information does not match (Yes in S202), the state determination unit 112 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 (S203). The current time is acquired from the timer 108. Note that even when position information is not recorded in the memory device 103 (when position information is first received for the current worker ID), it is determined that the compared position information does not match.

  On the other hand, when the compared position information matches (No in S202), the state determination unit 112 passes a predetermined time from the time indicated by the time information recorded in the memory device 103 for the current worker ID. It is determined whether or not (S204). That is, it is determined whether or not the time indicated by the timer 108 at the present time has passed a time obtained by adding a predetermined time to the time indicated by the time information recorded in the memory device 103 for the current worker ID. The predetermined time may be common to all workers or may be different for each worker.

  When the predetermined time has elapsed (Yes in S204), the state determination unit 112 acquires a name or the like corresponding to the current worker ID from the worker attribute storage unit 115, and an abnormality has occurred in the worker with the name. A message or a screen indicating that is displayed on the display device 106 (S205). Based on the message or the like, the supervisor can detect the abnormality of the worker.

  Subsequently, FIG. 9 is a flowchart for explaining a processing procedure executed by the monitoring server in response to reception of the conversion period information.

  When the conversion period information and the worker ID are received from a certain worker terminal 20, the conversion period information receiving unit 113 inputs the received conversion period information and the worker ID to the conversion period information output unit 114 (S301). Subsequently, the conversion period information output unit 114 calculates the length of the arbitrary conversion period based on the received conversion period information (S302). For example, when information indicating the length of the arbitrary conversion period is received as the conversion period information, no special calculation is performed, and the length is set as the length of the arbitrary conversion period. On the other hand, when information indicating the length of the random conversion period is received as the conversion period information, the conversion period information output unit 114 receives the low-accuracy position information in a predetermined period (for example, a work period of one day). The time obtained by subtracting the length of the random conversion period from the sum of the times is defined as the length of the arbitrary conversion period.

  Subsequently, the conversion period information output unit 114 outputs information indicating the length of the arbitrary conversion period in association with the received worker ID (S303). The output destination may be the auxiliary storage device 102 or the display device 106.

  The supervisor can grasp the time when the worker actually took a private action such as a break by confirming the output information. Therefore, it is possible to appropriately compensate for a decrease in the monitoring level caused by the low-accuracy position information being transmitted at random. As a result, it is possible to appropriately prevent the worker's moral deterioration. Note that the output information is merely the sum of the arbitrary conversion periods, not the timing. Therefore, the worker's privacy is ensured appropriately.

  The arbitrary conversion period in the predetermined period H can be calculated by (T1 / T2) × H based on the average occurrence interval T1 and the average duration T2. Therefore, the arbitrary conversion period may be calculated by subtracting the value calculated by such a calculation formula from the sum of the times when the low-accuracy position information is received in the predetermined period. In this case, T1 and T2 may be determined in the monitoring server 10, or may be determined on the worker terminal 20 side. When determined in the monitoring server 10, the values of T <b> 1 and T <b> 2 are recorded in the auxiliary storage device 102, for example, and distributed from the monitoring server 10 to each worker terminal 20. The conversion period information communication unit 26 of each worker terminal 20 receives the values of T1 and T2, and the position information conversion period selection unit 24 selects a random work period based on the received values of T1 and T2. When the values of T1 and T2 are determined in the worker terminal 20, the conversion period information communication unit 26 of each work terminal 20 may transmit T1 and T2 to the monitoring server 10 at the end of the predetermined period. . In this case, the conversion period information may not be transmitted.

  In addition, when T1 and T2 are determined in the monitoring server 10, there is an advantage that an unreasonable value can be prevented from being set to T1 and T2 by an operator. The illegal value here means a value that makes the random conversion period unreasonably long.

  by the way. The average occurrence interval T1 and average duration T2 used by the position information conversion period selection unit 24 and the accuracy of the operator's abnormality detection are closely related. Specifically, the shorter the average occurrence interval T1 or the longer the average duration time T2, the longer the random conversion period, that is, the period in which the low-accuracy position information is notified. If it does so, the opportunity which can determine the presence or absence of a worker's movement based on highly accurate position information reduces, As a result, possibility that a delay will arise in the detection of abnormality occurrence becomes high.

  Therefore, an example in which the average occurrence interval T1 and the average duration T2 are changed according to the degree of risk of occurrence of abnormality (hereinafter referred to as “risk level”) for each worker as a second embodiment. explain.

  FIG. 10 is a diagram illustrating a functional configuration example of the monitoring server according to the second embodiment. 10, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, the monitoring server 10a includes a risk level determination unit 121, a risk level correction unit 122, a random parameter determination unit 123, a random parameter transmission unit 124, a risk level management table 125, an environment information storage unit 126, and work information. A storage unit 127 and the like are further included.

  The environment information storage unit 126 is a storage area for storing environment information in the auxiliary storage device 102. For example, the environment information is input in real time from various sensors installed in the farm field. Examples of the environment information include temperature, humidity, rainfall, wind speed, etc. The work information storage unit 127 is an auxiliary storage. This is a storage area for storing information (work information) indicating action content (work content such as work schedule) for each worker in the apparatus 102. An example of the work information is whether or not a tractor is used. The work information is input every time work content is determined, for example.

  The risk level determination unit 121 determines, based on environmental information, worker attribute information, work information, and the like, for each worker and the item or type of the worker's abnormal state (hereinafter referred to as “risk item” or “abnormality”). The risk level during work is determined for each type. The determined risk level is recorded in the risk level management table 125 for each worker and each risk item. The risk level management table 125 is a table for managing the risk level using the auxiliary storage device 102 of the monitoring server 10a.

  FIG. 11 is a diagram illustrating a configuration example of a risk level management table. In the figure, the risk level is recorded in the risk level management table 125 for each worker and each risk item. That is, A, B, C, etc. in the column direction indicate worker IDs. 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 line of the risk level management table 125, the maximum value (maximum risk level) among the risk levels for all risk items is recorded for each worker. Moreover, since the content of environmental information changes every moment, the judgment of a risk level is performed repeatedly (for example, regularly). Therefore, the risk level of risk items that depend on dynamically changing information such as environmental information can change over time.

  Returning to FIG. The risk level correction unit 122 decreases the value of the risk level determined by the risk level determination unit 121 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 random parameter determination unit 123 determines parameter values (average occurrence interval T1 and average duration T2) used to determine the random conversion period based on the risk level. The risk level is determined for each worker. Therefore, the average occurrence interval T1 and the average duration T2 are also determined for each worker. The random parameter transmission unit 124 transmits the values of the average occurrence interval T1 and the average duration T2 determined by the random parameter determination unit 123 to the worker terminal 20.

  The functional configuration of the worker terminal 20 may be the same as that in the first embodiment.

  Hereinafter, a processing procedure of the monitoring server 10a according to the second embodiment will be described. FIG. 12 is a flowchart for explaining a processing procedure of risk level and random parameter determination processing. The process of FIG. 12 is executed in parallel with the processes of FIGS.

  In step S <b> 401, the risk level determination unit 121 acquires environment information from the environment information storage unit 126.

  FIG. 13 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 121 acquires worker attribute information and work information for one unprocessed worker from the worker attribute storage unit 115 or the work information storage unit 127 (S402). 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. 14 is a diagram illustrating a configuration example of the worker attribute storage unit. In the figure, worker attribute information is stored in the worker attribute storage unit 115 for each worker. The worker attribute information in the figure includes items such as worker ID, name, age, past history, and terminal address. 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. Note that the worker attribute storage unit 115 shown in FIG. 14 is also applicable to the first embodiment.

  FIG. 15 is a diagram illustrating a configuration example of the work information storage unit. In the figure, the work information storage unit 127 stores information (work information) indicating the daily work content 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.

  Note that the worker from whom the worker attribute information and the work information are acquired in step S402 is hereinafter referred to as a “current worker”.

  Subsequently, the risk level determination unit 121 sets an unprocessed risk item as a processing target (S403). For example, among the risk items listed in the risk level management table 125, one risk item that is not a processing target in FIG. 12 is a processing target. Hereinafter, the risk item to be processed is referred to as “current risk item”.

  Subsequently, the risk level determination unit 121 determines a risk level for the current worker's current risk item, and records the risk level as a determination result in the risk level management table 125 (S404). Subsequently, the risk level determination unit 121 calls the risk level correction unit 122 to start a risk level correction process related to the current risk item of the current worker (S405). Details of steps S404 and S405 will be described later.

  Steps S403 to S405 are repeatedly executed for all risk items (S406). 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 S406), the risk level determination unit 121 records the maximum risk level of the current worker in the risk level management table 125 (S407).

  Subsequently, the random parameter determination unit 123 determines values of random parameters (average occurrence interval T1 and average duration T2) for the current worker based on the maximum risk level (S408). The determination of the random parameter may be performed based on, for example, correspondence information between the maximum risk level and the value of the random parameter recorded in advance in the auxiliary storage device 102, or based on a predetermined calculation formula. It may be done. In either case, the higher the maximum risk level, the longer the average occurrence interval T1. Alternatively, the average duration T2 is shortened as the maximum risk level is higher. Alternatively, the higher the maximum risk level, the longer the average occurrence interval T1 and the shorter the average duration T2. That is, the value of the random parameter is determined such that the higher the maximum risk level, the shorter the random conversion period.

  Subsequently, the random parameter determination unit 123 transmits the determined random parameter value to the worker terminal 20 of the current worker (S409). The worker terminal 20 of the current worker is specified by the terminal address of the worker attribute information, for example. In the worker terminal 20, the value of the random parameter is received by the conversion period information communication unit 26. Thereafter, the position information conversion period selection unit 24 of the worker terminal 20 selects a random conversion period based on the received random parameter (determines the start timing and end timing of the random conversion period).

  Steps S402 to S409 are repeatedly executed for all workers (S410). As a result, the state of the risk level management table 125 is as shown in FIG. When the processing is completed for all workers (Yes in S410), the processing in FIG. 12 ends. Note that the process of FIG. 12 is executed periodically, 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. 12 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, the details of the processing in step S404 (risk level determination processing) 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, a specific example of risk level determination processing will be described for each risk item of heat stroke and tractor fall accident.

  FIG. 16 is a diagram for explaining a process for determining a risk level of 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 102. When the current risk item is heat stroke, the risk level determination unit 121 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. 16, 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. 16 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. 17 is a flowchart for explaining risk level determination processing for a tractor overturning accident.

  In step S501, the risk level determination unit 121 initializes the value of the risk level of the tractor fall accident to 0. Subsequently, the risk level determination unit 121 determines whether or not the tractor is scheduled to be used based on the work information of the current worker (S502). When 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. 17 is executed) is within the scheduled use time of the tractor. When there is a tractor use schedule (Yes in S502), the risk level determination unit 121 adds 1 to the risk level (S503). Subsequently, the risk level determination unit 121 confirms the age included in the worker attribute information of the current worker (S504). When the current worker is 41 to 50 years old, the risk level determination unit 121 adds 1 to the risk level (S505). If the current worker is 51 years old, the risk level determination unit 121 adds 2 to the risk level (S506). Subsequently, the risk level determination unit 121 checks the rainfall included in the environmental information (S507). When the rainfall is 20 mm or more (Yes in S507), the risk level determination unit 121 adds 1 to the risk level (S508).

  On the other hand, when there is no plan to use the tractor (No in S502), the steps after Step S503 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 S503, S506, and S508 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 S405 in FIG. 12 will be described. FIG. 18 is a flowchart for explaining the processing procedure of the risk level correction processing. The process in FIG. 18 is executed in parallel with the process in FIG. 12 for each worker and each risk item. For example, the risk level correction unit 122 may be activated as a thread or process different from the risk level determination unit 121 every time step S405 is executed. In this case, at the start of step S405, each thread or process started last time may be stopped.

  When called (initiated) in step S405 of FIG. 12, the risk level correction unit 122 acquires the current time from the timer 108 and records the current time in the memory device 103 as the start time (S601). Thereafter, without notification of occurrence of abnormality from the state determination unit 112 (No in S602), when a predetermined time has elapsed from the disclosure time (Yes in S603), the risk level correction unit 122 reads the risk level management table 125. 1 is reduced by 1 (S604). 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 122 (the thread or the process). That is, the risk level correction unit 122 executes the process of FIG. 18 in parallel for each worker and each risk level.

  Subsequently, the risk level correction unit 122 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 125 (S605). When the maximum risk level has changed (Yes in S605), the risk level correction unit 122 causes the random parameter determination unit 123 to determine the value of the random parameter based on the new maximum risk level (S606). The determination method of the value of the random parameter may be the same as that in step S408 in FIG. Subsequently, the risk level correcting unit 122 causes the random parameter transmitting unit 124 to transmit the newly determined random parameter (S607). The transmission destination of the random parameter is the worker terminal 20 of the worker corresponding to the risk level correction unit 122.

  On the other hand, when the occurrence of an abnormality is notified from the state determination unit 112 before the predetermined time has elapsed from the start time (Yes in S602), the process in FIG. 18 ends. For example, the thread or process as the risk level correction unit 122 ends.

  When the process as shown in FIG. 18 is executed by the risk level correction unit 122, the risk level is lowered for an operator who does not generate an abnormality for a predetermined time. As a result, the timing and length of the random conversion period can be dynamically and rationally adjusted according to the worker's condition.

  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.

  By the way, the conversion of the accuracy of the position information and the selection of the random conversion period are not necessarily executed by the operator terminal 20. For example, a computer such as a PC (Personal Computer) installed at a position where the worker terminal 20 and the monitoring server 10 are relayed, a mobile phone base station, a relay switch, a wireless LAN access point, etc. (hereinafter referred to as “relay device”). ).

  FIG. 19 is a diagram illustrating a modification of the worker monitoring system. In FIG. 19, the same parts as those in FIG.

  In the worker monitoring system 2 in the figure, the relay device 30 includes a position information conversion unit 22, a position information conversion period selection unit 24, a position information transmission unit 25, a conversion period information communication unit 26, a position information conversion table 27, and the like. Have. In addition, the worker terminal 20 includes a position information detection unit 21 and a position information conversion instruction reception unit 23.

  In the worker monitoring system 2, the position information detected by the position information detection unit 21 of the worker terminal 20 and transmitted by the position information transmission unit 23 is converted by the position information conversion unit 22 of the relay device 30. The position information output from the position information conversion unit 22 is received by the position information receiving unit 111 of the monitoring server 10. The selection of the random conversion period is performed by the position information conversion period selection unit 24 of the relay device 30.

  According to such a configuration, it is possible to consolidate position information conversion processing and the like regarding the plurality of worker terminals 20 in the relay device 30. As a result, the processing load on each worker terminal 20 can be reduced, and even a terminal with scarce resources can be used as the worker terminal 20. In addition, maintenance work for the position information conversion table 27 and the like can be simplified.

  Note that the function (position information conversion function) of the relay device 30 may be implemented in the monitoring server 10. However, in this case, raw position information (high-accuracy position information) regarding the worker terminal 20 is input to the monitoring server 10. Therefore, by changing the configuration of the monitoring server 10, it may be possible for a monitor or the like to obtain position information before conversion of accuracy. In view of such a point, it is desirable that the position information conversion function is mounted outside the monitoring server 10.

  In FIG. 19, the functional configuration of the monitoring server 10 may be the one shown in FIG. 1 or the one shown in FIG.

  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 portable terminal carried by a monitored person,
A position information detector for detecting position information;
A position information conversion instruction receiving unit that receives an instruction of a first period for converting the accuracy of the position information;
A position information conversion period selection unit that selects a second period for converting the accuracy of the position information;
A position information conversion unit that converts the accuracy of the position information of the first period and the second period;
A position information transmission unit that transmits position information whose accuracy is converted by the position information conversion unit, and position information of a period other than the first period and the second period detected by the position information detection unit;
A mobile terminal.
(Appendix 2)
A period information transmitting unit configured to transmit information indicating a length of the first period or the second period in a predetermined period including the first period and the second period to a transmission destination of the position information; The mobile terminal according to attachment 1.
(Appendix 3)
The mobile terminal according to supplementary note 1, wherein the position information conversion period selection unit selects the second period based on a predetermined parameter capable of calculating a length of the second period.
(Appendix 4)
The mobile terminal according to supplementary note 3, further comprising a parameter receiving unit that receives the predetermined parameter from a monitoring device that is a transmission destination of the position information.
(Appendix 5)
A monitoring system having a mobile terminal and a monitoring device carried by a monitored person,
The portable terminal is
A position information detector for detecting position information;
A position information conversion instruction receiving unit that receives an instruction of a first period for converting the accuracy of the position information;
A position information conversion period selection unit that selects a second period for converting the accuracy of the position information;
A position information conversion unit that converts the accuracy of the position information of the first period and the second period;
Position information whose accuracy is converted by the position information conversion unit, and a position information transmission unit that transmits position information in a period other than the first period and the second period detected by the position information detection unit. Have
The monitoring device
A location information receiving unit for receiving the location information from the mobile terminal;
And a state determination unit that determines whether the monitored person has an abnormality based on a change in the position information.
(Appendix 6)
The mobile terminal further includes
A conversion period information communication unit that transmits conversion period information indicating the length of the first period or the length of the second period to the monitoring device;
The monitoring device further comprises:
A conversion period information receiving unit for receiving the conversion period information;
The output of the length of the first period received by the conversion period information receiving unit, or the length of the second period received by the conversion period information receiving unit and the accuracy received by the position information receiving unit are converted. The monitoring system according to claim 5, further comprising: an output unit configured to output the length of the first period calculated based on the total reception time of the position information.
(Appendix 7)
In the portable terminal carried by the monitored person,
A position information conversion instruction receiving step for receiving an instruction of a first period for converting the position information;
A position information conversion period selection step of selecting a second period for converting position information;
A position information detecting step for detecting position information;
A position information conversion step for converting the accuracy of the position information of the first period and the second period;
Position information whose accuracy is converted in the position information conversion step, and a position information transmission step of transmitting position information in a period other than the first period and the second period detected in the position information detection step. The program to be executed.
(Appendix 8)
A period information transmission step of transmitting information indicating a length of the first period or the second period in a predetermined period including the first period and the second period to a transmission destination of the position information The program according to appendix 7.
(Appendix 9)
The program according to appendix 7, wherein the position information conversion time selection step selects the second period based on a predetermined parameter capable of calculating the length of the second period.
(Appendix 10)
The program according to claim 9, further comprising a parameter receiving step of receiving the predetermined parameter from a monitoring device that is a transmission destination of the position information.

1 worker monitoring system 10 monitoring server 20 worker terminal 21 position information detection unit 22 position information conversion unit 23 position information conversion instruction reception unit 24 position information conversion period selection unit 25 position information transmission unit 26 conversion period information communication unit 27 position information Conversion table 30 Relay device 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 111 Position Information Receiving Unit 112 State Determination Unit 113 Conversion Period Information Reception Unit 114 Conversion Period Information Output Unit 115 Worker Attribute Storage Unit 121 Risk Level Determination Unit 122 Risk Level Correction Unit 123 Random parameter determination unit 124 Random parameter transmission unit 125 Risk level management table 126 Environmental information storage unit 127 Work information storage unit 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 (4)

A portable terminal carried by a monitored person,
A position information detector for detecting position information;
A position information conversion instruction receiving unit that receives an instruction of a first period for converting the accuracy of the position information;
A position information conversion period selection unit that selects a second period for converting the accuracy of the position information;
A position information conversion unit that converts the accuracy of the position information of the first period and the second period;
A position information transmission unit that transmits position information whose accuracy is converted by the position information conversion unit, and position information of a period other than the first period and the second period detected by the position information detection unit;
A mobile terminal. A monitoring system having a mobile terminal and a monitoring device carried by a monitored person,
The portable terminal is
A position information detector for detecting position information;
A position information conversion instruction receiving unit that receives an instruction of a first period for converting the accuracy of the position information;
A position information conversion period selection unit that selects a second period for converting the accuracy of the position information;
A position information conversion unit that converts the accuracy of the position information of the first period and the second period;
Position information whose accuracy is converted by the position information conversion unit, and a position information transmission unit that transmits position information in a period other than the first period and the second period detected by the position information detection unit. Have
The monitoring device
A location information receiving unit for receiving the location information from the mobile terminal;
And a state determination unit that determines whether the monitored person has an abnormality based on a change in the position information. The mobile terminal further includes
A conversion period information communication unit that transmits conversion period information indicating the length of the first period or the length of the second period to the monitoring device;
The monitoring device further comprises:
A conversion period information receiving unit for receiving the conversion period information;
The output of the length of the first period received by the conversion period information receiving unit, or the length of the second period received by the conversion period information receiving unit and the accuracy received by the position information receiving unit are converted. The monitoring system according to claim 2, further comprising: an output unit configured to output the length of the first period calculated based on the total reception time of the position information. In the portable terminal carried by the monitored person,
A position information conversion instruction receiving step for receiving an instruction of a first period for converting the position information;
A position information conversion period selection step of selecting a second period for converting position information;
A position information detecting step for detecting position information;
A position information conversion step for converting the accuracy of the position information of the first period and the second period;
Position information whose accuracy is converted in the position information conversion step, and a position information transmission step of transmitting position information in a period other than the first period and the second period detected in the position information detection step. The program to be executed.

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