JP6810354B2 - Judgment program, judgment method, and judgment device - Google Patents

Description

The present invention relates to a determination program, a determination method, and a determination device.

When working outdoors such as at a construction site in the summer, it is important to have each worker take an appropriate break so that the worker does not suffer from heat stroke. A good break is to take a good break in a rest area where direct sunlight can be avoided and the temperature is cooler than the work site.

How long it is appropriate to take a break depends on the work intensity of the worker. Guidance is provided by various organizations regarding the appropriate work time rate according to the work intensity. For example, the American Conference of Governmental Industrial Hygienists (ACGIH) provides guidance on working environment tolerances for heat stress.

As an appropriate resting place for a break in the summer, for example, a resting facility using rainwater is considered. In order to prevent heat stroke, a heat stroke prevention system that notifies when there is a risk of heat stroke is also considered. In addition, earplug-type personal heat stroke alarm devices that can be used by anyone regardless of whether or not they wear protective clothing and regardless of the working environment are also being considered. There is also a sports accident prevention system that reliably prevents sports accidents such as heat stroke by notifying the user of warning data using images and sounds.

JP-A-2010-144438 Japanese Unexamined Patent Publication No. 2012-210233 JP-A-2010-131209 Japanese Unexamined Patent Publication No. 2005-334821

Ken PARSONS, "Heat Stress Standard ISO 7243 and its Global Application", Industrial Health, 2006 Jul, Vol.44 No.3, pp.368-379 Brenda Jacklitsch, W. Jon Williams, Kristin Musolin, Aitor Coca, Jung-Hyun Kim, Nina Turner, "Criteria for a Recommended Standard: Occupational Exposure to Heat and Hot Environments Revised Criteria 2016" DHHS (NIOSH) Publication Number 2016-106, February 2016

When there are a large number of workers, it is difficult for one to control whether all the workers are taking appropriate breaks. Therefore, it is conceivable to give the worker a device capable of measuring the position, monitor the position of the worker in real time using a computer, and measure the staying time of the worker at the resting place. For such a system, it is assumed that the location of the rest area is known accurately.

However, at construction sites, the location of rest areas is often not fixed. For example, depending on the progress of construction, the break tent may be moved to a value that does not interfere with the construction at any time. Also, if large enough trees are planted near the construction site, the shade of the trees can be used as a resting place, but the direction of the shade of the trees changes in the morning and afternoon. That is, the appropriate resting place moves.

Conventionally, when the position of the resting place is not fixed in this way, the position of the resting place cannot be automatically specified. As a result, it is difficult to accurately determine whether a worker has taken a break at an appropriate resting place.

On one side, the case aims to enable the location of appropriate rest areas.

In one proposal, a determination program is provided that causes the computer to perform the following processing.
The computer acquires a measurement history showing the results of periodically measuring the exercise intensity, the location position, and the ambient temperature of a plurality of workers. The computer then selects each of the plurality of workers as different observation target workers. Next, the computer identifies the non-working state period in which the observation target worker is in the non-working state based on the time-series change of the exercise intensity of the observation target worker. Next, the computer identifies the staying position indicating the position of the area where the observation target worker has stayed continuously for a predetermined time or more within the non-working state period based on the time-series change of the location position of the observation target worker. Next, the computer determines whether or not there is a tendency for the ambient temperature during the stay to drop by a predetermined temperature or more compared to before the stay in the area of the observer, based on the time-series change in the ambient temperature of the observer. judge. Next, the computer identifies the position of the region determined to have a tendency to decrease in temperature as a resting place candidate according to the operator to be observed. Next, the computer selects each of the plurality of workers as an observation target, identifies the resting place candidates according to each of the plurality of workers, and as a result, appropriately determines the position specified as the resting place candidate more than a predetermined number of times. Judged as the location of a good rest area.

According to one aspect, the location of an appropriate resting place can be specified.

It is a figure which shows an example of the structure of the determination system which concerns on 1st Embodiment. It is a figure which shows an example of the system of the 2nd Embodiment. It is a figure which shows one configuration example of the hardware of a management device. It is a block diagram which shows an example of the function of a management device. It is a figure which shows an example of the worker profile DB. It is a figure which shows an example of the measurement value history DB. It is a figure which shows an example of the WBGT history DB. It is a figure which shows an example of the worker state history DB. It is a figure which shows an example of the CD rest place candidate DB. It is a figure which shows an example of a CD resting place DB. It is a flowchart which shows an example of the procedure of the CD rest place determination process. It is a figure which shows the change of the measured value collected from the measuring instrument of one worker. It is a figure which shows the estimation example of a working state / non-working state. It is a figure which shows the judgment example of the condition about the length of the non-working state period, and the decrease tendency of an ambient temperature. It is a figure which shows the determination example of whether or not staying at the same position. It is a figure which shows the determination example of the CD rest place candidate. It is a flowchart which shows an example of the procedure of the CD break state evaluation processing. It is a figure which shows an example of the time-series change of a working time rate. It is a figure which shows the calculation example of the working strength level. It is a figure which shows the relationship between the work intensity level, the work time rate, and the WBGT value. It is a figure which shows the calculation example of the reference value of the working time rate. It is a figure which shows the comparison example of the reference value of the working time rate, and the measured value of the working time rate of a worker. FIG. 1 is a first diagram showing an example of determination of a CD resting place and evaluation of a CD resting state. FIG. 2 is a second diagram showing an example of determination of a CD resting place and evaluation of a CD resting state. FIG. 3 is a third diagram showing an example of determination of a CD resting place and evaluation of a CD resting state. FIG. 4 is a fourth diagram showing an example of determination of a CD resting place and evaluation of a CD resting state. FIG. 5 is a fifth diagram showing an example of determination of a CD resting place and evaluation of a CD resting state.

Hereinafter, the present embodiment will be described with reference to the drawings. It should be noted that each embodiment can be implemented by combining a plurality of embodiments within a consistent range.
[First Embodiment]
FIG. 1 is a diagram showing an example of a configuration of a determination system according to the first embodiment. A plurality of workers 1a, 1b, 1c, 1d wear measuring instruments 2a, 2b, 2c, 2d, respectively. The measuring instruments 2a, 2b, 2c, and 2d periodically measure the exercise intensity, the location, and the ambient temperature of the workers 1a, 1b, 1c, and 1d. Exercise intensity is the amount of metabolism (calorie consumption) per unit time of workers 1a, 1b, 1c, 1d. The measuring instruments 2a, 2b, 2c, and 2d transmit the measurement result to the determination device 10 by, for example, wireless communication.

The determination device 10 has a storage unit 11 and a processing unit 12. The storage unit 11 is, for example, a memory or storage device included in the determination device 10. The processing unit 12 is, for example, a processor included in the determination device 10.

The storage unit 11 stores a measurement history showing the results of periodically measuring the exercise intensity, the location position, and the ambient temperature of the plurality of workers 1a, 1b, 1c, and 1d.
The processing unit 12 identifies the position of a resting place suitable for a plurality of workers 1a, 1b, 1c, and 1d to take a break based on the measurement history stored in the storage unit 11. For example, the processing unit 12 first acquires, from the storage unit 11, a measurement history showing the results of periodically measuring the exercise intensity, the location position, and the ambient temperature of the plurality of workers 1a, 1b, 1c, and 1d. Next, the processing unit 12 selects a plurality of workers 1a, 1b, 1c, and 1d as observation target workers, and performs the following processing on the observation target workers.

The processing unit 12 identifies the non-working state period in which the observation target worker is in the non-working state based on the time-series change in the exercise intensity of the observation target worker. Next, the processing unit 12 specifies a stay position indicating the position of an area in which the observation target worker has continuously stayed for a predetermined time or longer within the non-working state period based on the time-series change of the observation target worker's location position. To do. Next, the processing unit 12 tends to decrease the ambient temperature during the stay by a predetermined temperature or more as compared with before staying in the area of the observer, based on the time-series change of the ambient temperature of the observer. Determine the presence or absence. Then, the processing unit 12 identifies the position of the region determined to have a tendency to decrease in temperature as a resting place candidate according to the observation target worker.

For example, the processing unit 12 determines that a period in which the exercise intensity of the observation target worker is equal to or less than a predetermined value continues for a predetermined time (for example, 5 minutes) or more is a non-working state period. Then, when the observation target worker continuously stays in the area of a predetermined area for a predetermined time or more within the non-working state period, the processing unit 12 specifies the central position of the area as the stay position. .. In the example of FIG. 1, when the worker 1a is the observation target worker, he / she stays at the position A twice for 5 minutes or more within the non-working state. During the period in which the worker 1a stayed at the position A, the ambient temperature was lowered by a predetermined value (for example, 2 degrees Celsius) or more as compared with that before the stay. The worker 1a also stays at the position B within the non-working period, but the stay period is less than 5 minutes. Moreover, during the period in which the worker 1a stayed at the position B, the ambient temperature did not drop by more than a predetermined value as compared with before the stay. Therefore, from the measurement history of the worker 1a, the position A is specified twice as a resting place candidate, but the position B is not specified as a resting place candidate.

When the processing when each of the plurality of workers 1a, 1b, 1c, and 1d is set as the observation target worker is completed, the processing unit 12 identifies the resting place candidates corresponding to each of the plurality of workers, and as a result, the predetermined number of times or more. The position identified as a resting place candidate is determined as an appropriate resting place position. For example, the processing unit 12 determines a position specified as a resting place candidate more than or equal to a value obtained by multiplying the number of workers by a predetermined constant as an appropriate resting place position.

In the example of FIG. 1, the position "A" is specified twice as a resting place candidate based on the measurement history of the worker 1a. Based on the measurement history of the worker 1b, the position "A" is specified twice and the position "B" is specified once as resting place candidates. Based on the measurement history of the worker 1c, the position "A" is specified twice as a break place candidate. Based on the measurement history of the worker 1d, the position "A" is specified once and the position "B" is specified once as resting place candidates.

For example, a position that is a candidate for a resting place 1.5 times as many times as the number of workers is determined to be a resting place. In the example of FIG. 1, since there are four workers, the position specified as a resting place candidate six times or more is the resting place. Position "A" is determined to be a resting place because it has been identified as a resting place candidate seven times. On the other hand, the position "B" is not determined to be a resting place because it is specified as a resting place candidate only twice.

In this way, an appropriate resting place position can be automatically determined based on the exercise intensity, the location position, and the ambient temperature of the plurality of workers.
The processing unit 12 may set each of a plurality of times at predetermined time intervals as the evaluation reference time, and determine the position of the resting place for each evaluation reference time. In this case, the processing unit 12 determines the position of the resting place within the predetermined period up to the evaluation reference time from the resting place candidates specified based on the measured values measured within the predetermined period until the evaluation reference time. To do. In this way, by determining the position of the resting place for different evaluation reference times, for example, the position of the resting place in the morning and the position of the resting place in the afternoon are determined. As a result, even when the resting place moves, it is possible to determine the position before and after the movement and the time zone in which the resting place was installed at that position.

Further, the processing unit 12 may evaluate whether or not each of the plurality of workers 1a, 1b, 1c, and 1d is taking a sufficient break at the resting place based on the determined position of the resting place. For example, the processing unit 12 selects an evaluation target worker to be evaluated from a plurality of workers. Next, the processing unit 12 determines, per unit time, when the period during which the evaluation target worker is not staying at the resting place is set as the working time based on the time-series change of the location position of the evaluation target worker. Calculate the work time rate, which indicates the ratio of the work time of the worker to be evaluated. Then, the processing unit 12 outputs alert information when the work time rate exceeds the work time rate reference value indicating the ratio of the work time allowed for the evaluation target worker per unit time. By evaluating the break status of each of the plurality of workers 1a, 1b, 1c, and 1d in this way, if there is a worker who lacks a break, the worker can be quickly identified and the break can be encouraged. Can be done.

Further, the processing unit 12 may calculate the work time rate reference value of the evaluation target worker based on the time series change of the exercise intensity of the evaluation target worker. For example, the processing unit 12 calculates a time-series change in the work intensity level indicating the work intensity of the evaluation target worker based on the time-series change in the exercise intensity of the evaluation target worker. Next, the processing unit 12 calculates the time-series change of the work time rate reference value based on the time-series change of the work intensity level. Further, in the calculation of the work time rate, the processing unit 12 calculates the time series change of the work time rate based on the time series change of the location position of the worker to be evaluated. Then, in the output of the alert information, the processing unit 12 compares the time-series change of the working time rate with the time-series change of the working time rate reference value, and there is a period in which the working time rate exceeds the working time rate reference value. When, alert information is output. As a result, even when the work intensity level of the worker fluctuates, the break time per unit time required for the worker can be correctly obtained. As a result, the detection accuracy of the worker who lacks the break time is improved.

[Second Embodiment]
Next, the second embodiment will be described. The second embodiment is suitable for reducing heat stress as a measure against heat stroke for workers who are performing work of various intensities with various work patterns in a hot environment such as a construction site. It is a system that monitors whether or not a person is taking a break at a place. The hot environment is an environment corresponding to the summer heat that affects the body. Hereinafter, a place suitable for reducing heat stress is referred to as a cool-down (CD) rest area. A CD resting place is, for example, a place where direct sunlight can be avoided and the temperature is lower than that of the work site. Further, the state of the worker when the worker is resting at the CD resting place is referred to as a CD resting state.

FIG. 2 is a diagram showing an example of the system of the second embodiment. At the construction site, a plurality of workers 31 to 34 are working. At the construction site, there are CD rest areas such as tents 41 and trees 42. However, the tent 41 is moved to a place that does not interfere with the construction at any time according to the progress of the construction. The shaded area of the tree 42 is the CD rest area, but the shaded position changes according to the direction of the sun. As described above, the position of the CD resting place in the construction site is not constant.

Workers 31 to 34 carry measuring instruments 31a, 32a, 33a, 34a and mobile terminals 31b, 32b, 33b, 34b, respectively. The measuring instruments 31a, 32a, 33a, 34a measure the positions of the workers 31 to 34, the ambient temperature, and the METs values. Hereinafter, the position measured by the measuring instruments 31a, 32a, 33a, 34a, the ambient temperature, and the METs value are collectively referred to as a measured value.

The METs value is a value indicating the exercise intensity of the worker. The METs value is expressed by how many times the metabolic amount per unit time of the workers 31 to 34 is multiplied by the resting state. For example, the measuring instruments 31a, 32a, 33a, 34a measure the movements of the workers 31 to 34 by the motion sensor, and calculate the METs value from the measurement result. Further, the measuring instruments 31a, 32a, 33a, 34a include, for example, radio wave strength from access points 43 to 45 for wireless communication, signals from a satellite positioning system represented by GPS (Global Positioning System), and wireless communication signals. By information analysis that combines the measured values of the motion sensor, the positions of the workers 31 to 34 are measured with an accuracy of about several tens of centimeters. The measuring instruments 31a, 32a, 33a, 34a transmit the measured values to the management device 100 by wireless communication.

The thermometer included in the measuring instruments 31a, 32a, 33a, 34a may be a simple thermometer. That is, the temperature measured by the measuring instruments 31a, 32a, 33a, 34a only needs to be able to grasp the tendency of the ambient temperature to rise and fall, and the accuracy of the temperature as an absolute value is not required.

Since the measuring instruments 31a, 32a, 33a, and 34a are worn by the worker during work, they are easily affected by various external influences such as the worker's body temperature and the worker's work condition, and are absolutely necessary in the first place. It is difficult to measure the temperature as a value with high accuracy. Therefore, the management device 100 determines whether or not the worker is in the CD break state based on the information regarding the tendency of the temperature around the worker to rise and fall so that the measurement accuracy of the temperature as an absolute value may be low.

The mobile terminal units 31b, 32b, 33b, 34b are terminal devices capable of wirelessly performing data communication via, for example, a mobile communication system. When there is a risk of heat stroke, the workers 31 to 34 receive a message notifying the danger of heat stroke by the mobile terminals 31b, 32b, 33b, 34b.

The management device 100 manages whether or not the workers 31 to 34 are taking sufficient breaks at the CD rest area. A plurality of access points 43 to 45 and a total of 46 WBGTs (Wet Bulb Globe Temperature) are connected to the management device 100 via the network 20.

The WBGT total 46 is a device for measuring the WBGT value, which is also called a heat index. The WBGT value is an index that incorporates three factors, humidity, radiant heat, and temperature, which have a large effect on the heat balance of the human body. The WBGT meter 46 calculates the WBGT value using the values of the dry-bulb temperature, the wet-bulb temperature, and the black-bulb temperature.

The management device 100 collects information indicating the state of the worker from the measuring instruments 31a, 32a, 33a, 34a carried by the workers 31 to 34 via the access points 43 to 45. Further, the management device 100 collects the WBGT value of the construction site from the WBGT total 46. Then, the management device 100 analyzes the collected information, identifies the position of the CD resting place for each time zone, and determines whether or not each worker 31 to 34 is taking a sufficient break at the CD resting place.

For example, the system manager tells the management device 100 that the working time allowed for each worker 31-34 in terms of thermal work stress based on the WBGT value of the construction site and the working intensity of the workers 31-34. Set the threshold of the rate. The working time rate is the ratio of the hours worked without rest per unit time. Then, the management device 100 monitors the working time rate of the workers 31 to 34 and evaluates whether or not a sufficient break time is taken between the working hours by comparing with the threshold value.

In order to correctly calculate the working time rate, it is important to accurately determine whether the workers 31 to 34 are in the working state or the resting state. The management device 100 assumes that the state in which the workers 31 to 34 are staying in the CD rest area and the exercise intensity is lowered to rest the body is the rest state. That is, the management device 100 monitors whether the CD break state time per unit time is sufficiently taken for each worker 31 to 34.

If the location of the CD rest area is fixed, by registering the location in the management device 100, the management device 100 allows the workers 31 to 34 to CD based on the position information of the workers 31 to 34. You can determine if you are taking a break at the rest area. However, as shown in FIG. 2, when the position of the CD resting place moves according to the date and time and the situation, the position of the CD resting place is manually registered each time according to the movement of the position of the CD resting place. Is complicated. Further, if there is a long time between moving the CD rest area and manually registering the position in the management device 100, the rest state of the workers 31 to 34 cannot be correctly grasped during that time.

Therefore, in the second embodiment, the location position, ambient temperature, and METs value of each worker 31 to 34 are measured by the measuring instruments 31a, 32a, 33a, and 34a. Then, the management device 100 determines the position of the CD resting place based on the measured value. For example, in the management device 100, one of the workers stays continuously for a predetermined time or more, and the worker is in a non-working state while staying there, and the exercise intensity of the worker is compared with the period before the stay. A place where a pattern in which the ambient temperature drops frequently occurs is a candidate for a CD resting place. Then, the management device 100 determines that the position designated as the CD resting place candidate from the measured values of a large number of workers is the CD resting place. The CD rest area is determined for each measurement time zone of the measured value.

When the CD resting place can be identified, the management device 100 determines the period during which each worker rests at the CD resting place by using the position information of the CD resting place. The management device 100 sets the state in which the worker is staying in the CD rest area in the non-working state as the CD break state, and detects the worker whose time in the CD break state is insufficient. The appropriate CD break time for each worker is determined for each worker based on the work intensity of the worker and the WBGT value at the construction site. Then, the management device 100 transmits a message (alert) indicating a heat stroke warning to the mobile terminal possessed by the worker who lacks the CD break state.

As a result, even if the position of the CD resting place sometimes moves depending on the date and time and the situation, the position of the CD resting place can be automatically specified for each period, and the complexity of registering the position of the CD resting place and the registration error Can be avoided. In addition, since the CD rest area can be accurately identified, even for workers whose exercise intensity does not change so much or whose exercise intensity and ambient temperature measurement accuracy is poor, when the worker moves to the CD rest area, You can identify if you are staying. As a result, it is possible to prevent an operator who has not taken an appropriate break from being overlooked, or conversely, to misdetermine that a worker who has taken an appropriate break but lacks a break is erroneously determined.

The management device 100 shown in FIG. 2 is an example of the determination device 10 shown in FIG. Hereinafter, the determination process of the CD rest area and the evaluation process of whether or not the worker's CD rest state is sufficient by the management device 100 will be specifically described.

FIG. 3 is a diagram showing a configuration example of the hardware of the management device. The entire device of the management device 100 is controlled by the processor 101. A memory 102 and a plurality of peripheral devices are connected to the processor 101 via a bus 109. The processor 101 may be a multiprocessor. The processor 101 is, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or a DSP (Digital Signal Processor). At least a part of the functions realized by the processor 101 executing the program may be realized by an electronic circuit such as an ASIC (Application Specific Integrated Circuit) or a PLD (Programmable Logic Device).

The memory 102 is used as the main storage device of the management device 100. The memory 102 temporarily stores at least a part of an OS (Operating System) program or an application program to be executed by the processor 101. Further, various data necessary for processing by the processor 101 are stored in the memory 102. As the memory 102, for example, a volatile semiconductor storage device such as a RAM (Random Access Memory) is used.

Peripheral devices connected to the bus 109 include a storage device 103, a graphic processing device 104, an input interface 105, an optical drive device 106, a device connection interface 107, and a network interface 108.

The storage device 103 electrically or magnetically writes and reads data from the built-in recording medium. The storage device 103 is used as an auxiliary storage device for a computer. The storage device 103 stores an OS program, an application program, and various data. As the storage device 103, for example, an HDD (Hard Disk Drive) or an SSD (Solid State Drive) can be used.

A monitor 21 is connected to the graphic processing device 104. The graphic processing device 104 causes the image to be displayed on the screen of the monitor 21 in accordance with the instruction from the processor 101. The monitor 21 includes a display device using a CRT (Cathode Ray Tube), a liquid crystal display device, and the like.

A keyboard 22 and a mouse 23 are connected to the input interface 105. The input interface 105 transmits signals sent from the keyboard 22 and the mouse 23 to the processor 101. The mouse 23 is an example of a pointing device, and other pointing devices can also be used. Other pointing devices include touch panels, tablets, touchpads, trackballs and the like.

The optical drive device 106 reads the data recorded on the optical disk 24 by using a laser beam or the like. The optical disk 24 is a portable recording medium on which data is recorded so that it can be read by reflection of light. The optical disk 24 includes a DVD (Digital Versatile Disc), a DVD-RAM, a CD-ROM (Compact Disc Read Only Memory), a CD-R (Recordable) / RW (ReWritable), and the like.

The device connection interface 107 is a communication interface for connecting peripheral devices to the management device 100. For example, a memory device 25 or a memory reader / writer 26 can be connected to the device connection interface 107. The memory device 25 is a recording medium equipped with a communication function with the device connection interface 107. The memory reader / writer 26 is a device that writes data to the memory card 27 or reads data from the memory card 27. The memory card 27 is a card-type recording medium.

The network interface 108 is connected to the network 20. The network interface 108 transmits / receives data to / from another computer or communication device via the network 20.

With the hardware configuration as described above, the processing function of the second embodiment can be realized. The determination device 10 shown in the first embodiment can also be realized by the same hardware as the management device 100 shown in FIG.

The management device 100 realizes the processing function of the second embodiment by executing, for example, a program recorded on a computer-readable recording medium. The program that describes the processing content to be executed by the management device 100 can be recorded on various recording media. For example, a program to be executed by the management device 100 can be stored in the storage device 103. The processor 101 loads at least a part of the program in the storage device 103 into the memory 102 and executes the program. Further, the program to be executed by the management device 100 can be recorded on a portable recording medium such as an optical disk 24, a memory device 25, and a memory card 27. The program stored in the portable recording medium can be executed after being installed in the storage device 103, for example, under the control of the processor 101. The processor 101 can also read and execute the program directly from the portable recording medium.

FIG. 4 is a block diagram showing an example of the function of the management device. The management device 100 includes a worker profile DB 110, a measured value history DB 120, a WBGT history DB 130, a worker status history DB 140, a CD resting place candidate DB 150, a CD resting place DB 160, a measured value collecting unit 171 and a WBGT value collecting unit 172, and a CD break. It has a place determination unit 173, a CD break state evaluation unit 174, and an alert notification unit 175.

The worker profile DB 110 stores information (profile) about each of the workers 31 to 34. The measured value history DB 120 stores the history of the measured values of the workers 31 to 34. The WBGT history DB 130 stores the history of the WBGT value. The worker state history DB 140 stores the history of the work state and work intensity level of each worker. The CD resting place candidate DB 150 stores the CD resting place candidate. The CD resting place DB160 stores the CD resting place.

The measured value collecting unit 171 periodically collects measured values from the measuring instruments 31a, 32a, 33a, 34a carried by each of the workers 31 to 34. The measured value collecting unit 171 stores the collected measured values in the measured value history DB 120.

The WBGT value collecting unit 172 periodically collects the WBGT value from the WBGT total 46. The WBGT value collecting unit 172 stores the collected WBGT value in the WBGT history DB 130.
The CD resting place determination unit 173 determines the position of the CD resting place based on the measured value stored in the measured value history DB 120. The CD resting place determination unit 173 first determines the position of the CD resting place candidate from the measured values of each of the workers 31 to 34, for example. The CD resting place determination unit 173 stores the determined positions of the CD resting place candidates in the CD resting place candidate DB 150. Next, the CD resting place determination unit 173 determines that the CD resting place candidate that many workers use for a break among the CD resting place candidates is a CD resting place. The CD resting place determination unit 173 stores the determined positions of the CD resting place candidates in the CD resting place DB 160.

The CD break state evaluation unit 174 collates the measured value with the position of the CD rest place, and evaluates whether or not the time of the CD break state is sufficient for each of the workers 31 to 34. For example, the CD break state evaluation unit 174 determines the CD break time required for the worker based on the WBGT value of the evaluation target period and the work intensity of the worker. Next, the CD break state evaluation unit 174 collates the measured value of the worker in the evaluation target period with the position of the CD rest place, calculates the time that the worker stays in the CD break place in the non-working state, and calculates the time. It is the CD break time of the worker. Then, when the CD break time of the worker is less than the CD break time required for the worker, the CD break state evaluation unit 174 determines that the break of the worker is insufficient. When the CD break state evaluation unit 174 detects a worker whose break is insufficient, the CD break state evaluation unit 174 transmits the identifier (worker ID) of the worker to the alert notification unit 175 as an alert notification target.

The alert notification unit 175 transmits an alert message to the mobile terminal possessed by the worker who is the target of the alert notification.
The line connecting each element shown in FIG. 4 indicates a part of the communication path, and a communication path other than the illustrated communication path can be set. Further, the function of each element shown in FIG. 4 can be realized, for example, by causing a computer to execute a program module corresponding to the element.

Next, the information stored in each DB will be described in detail with reference to FIGS. 5 to 10.
FIG. 5 is a diagram showing an example of the worker profile DB. In the worker profile DB 110, profiles 111, 112, ... For each worker 31 to 34 are stored. The profiles 111, 112, ... Include, for example, a worker ID, a device ID, a basic work intensity, a mobile terminal address, and the like. The worker ID is an identifier of the worker. The device ID is an identifier of the measuring instrument possessed by the operator. The basic work intensity is the intensity of the work assigned to the worker. The mobile terminal address is an e-mail address corresponding to the mobile terminal owned by the worker.

FIG. 6 is a diagram showing an example of the measured value history DB. In the measured value history DB 120, position information 121a, 121b, ... For each worker, METs information 122a, 122b, ... For each worker, and ambient temperature information 123a, 123b, ... For each worker, ... Is stored.

In the position information 121a, 121b, ... For each worker, a record indicating the position information collected from the measuring instrument of the corresponding worker is registered. The record showing the position information includes the device ID, the date and time, the latitude, and the longitude. The device ID is an identifier of the measuring instrument of the operator. The date and time are the date and time when the location information was acquired. Latitude is the latitude of the place where the worker was at the corresponding date and time. The longitude is the longitude of the place where the worker was at the corresponding date and time.

In the METs information 122a, 122b, ... For each worker, a record indicating the METs value collected from the measuring instrument of the corresponding worker is registered. The record indicating the METs value includes the device ID, the date and time, and the METs value. The device ID is an identifier of the measuring instrument of the operator. The date and time are the date and time when the location information was acquired. The METs value is a METs value indicating the exercise intensity of the worker at the corresponding date and time.

In the ambient temperature information 123a, 123b, ... For each worker, a record indicating the ambient temperature collected from the corresponding measuring instrument of the worker is registered. The record indicating the ambient temperature includes the device ID, the date and time, and the ambient temperature. The device ID is an identifier of the measuring instrument of the operator. The date and time are the date and time when the ambient temperature was acquired. The ambient temperature is the temperature around the worker at the corresponding date and time.

FIG. 7 is a diagram showing an example of the WBGT history DB. The WBGT history DB 130 stores the WBGT history 131 of the construction site. In the WBGT history 131, a record showing the WBGT value collected from the WBGT total 46 is registered. The record indicating the WBGT value includes the device ID, the date and time, and the WBGT value. The device ID is an identifier of the WBGT meter. The date and time are the date and time when the WBGT value was acquired. The WBGT value is the WBGT value of the construction site at the corresponding date and time.

FIG. 8 is a diagram showing an example of the worker state history DB. The worker status history DB 140 stores status histories 141, 142, ... For each worker.
Records indicating the status of the workers are registered in the status histories 141, 142, ... For each worker. The worker status record includes device ID, date and time, work / non-work status, and work intensity level. The device ID is an identifier of the measuring instrument of the operator. The date and time is a date and time indicating the end time of the time zone for which the state of the worker is determined. The work / non-work state is information indicating whether the worker is working (work state) or not (non-work state) in the time zone indicated by the corresponding date and time. The work intensity level is the work intensity of the worker in the time zone indicated by the corresponding date and time. The working intensity is expressed in three stages, for example, "mild: 1", "moderate: 2", and "severe: 3". When the worker is in a non-working state, the working intensity is "mild: 1".

FIG. 9 is a diagram showing an example of a CD resting place candidate DB. The CD resting place candidate DB 150 stores the CD resting place candidate lists 151, 152, ... For each worker. In the CD resting place candidate list 151,152, ..., Records indicating the specified CD resting place candidates based on the measured values of the corresponding workers are registered. The record indicating the CD resting place candidate includes the CD resting place ID, the position, and the length of stay. The CD resting place ID is an identifier of the CD resting place candidate. The position is the latitude and longitude indicating the position of the candidate CD resting place. The period of stay is the period during which the worker was staying at the CD rest area.

FIG. 10 is a diagram showing an example of a CD resting place DB. The CD resting place DB160 stores a list of CD resting places 161, 162, ... For each date and time, which is a reference for evaluation of the CD resting place. That is, in the CD rest area list 161, 162, ..., The places that were the CD rest areas during a predetermined period (for example, 2 hours) until the date and time as the evaluation reference are listed. In the CD resting place list 161, 162, ..., Records indicating the CD resting place determined based on the corresponding date and time are registered. The record indicating the CD resting place includes the CD resting place ID and the position. The CD resting place ID is an identifier of the CD resting place. The location is the latitude and longitude indicating the location of the CD rest area.

The management device 100 uses the above data to determine the CD rest area and evaluate whether each worker is taking a sufficient break.
First, the CD resting place determination process will be described in detail.

FIG. 11 is a flowchart showing an example of the procedure for determining the CD rest area. Hereinafter, the process shown in FIG. 11 will be described along with the step numbers.
[Step S101] The CD rest area determination unit 173 sets the initial value of the evaluation reference time T. For example, the CD resting place determination unit 173 sets the time after a predetermined time has elapsed (for example, 2 hours) from the work start time of the day at the construction site as the initial value of the evaluation reference time T.

[Step S102] The CD resting place determination unit 173 selects one of the workers who have not evaluated the evaluation reference time T from the worker profile DB 110 as the worker to be evaluated.

[Step S103] From the measured value history DB 120, the CD resting place determination unit 173 determines the position information, the METs value, and the ambient temperature of the worker to be evaluated for the latest predetermined period (for example, 2 hours) of the evaluation reference time T. Get history.

[Step S104] The CD resting place determination unit 173 specifies the non-working state period of the worker to be evaluated. The non-working state period is a period in which the non-working state of the worker to be evaluated continues for a predetermined time or longer. The non-working state period may include a predetermined period before and after the period in which the non-working state of the worker to be evaluated continues for a predetermined time or longer. For example, the transition period from the working state to the non-working state and the transition period from the non-working state to the working state may be included in the non-working state period. Whether or not it is in a non-working state is determined based on the METs value. For example, if the METs value of the worker to be evaluated is equal to or less than a predetermined value, the CD resting place determination unit 173 determines that the worker is in a non-working state at the time of acquiring the METs value.

[Step S105] The CD resting place determination unit 173 identifies a point where the worker to be evaluated stayed during the non-working state period and a staying period. Staying means that the worker to be evaluated stays around a certain point (within a predetermined range) for a predetermined time or longer.

[Step S106] The CD resting place determination unit 173 determines whether or not the ambient temperature of the worker whose stay period is to be evaluated at the place where he / she was staying during the non-working state period is lower than that before the stay period. judge. For example, the CD resting place determination unit 173 determines that there is a temperature decrease when the ambient temperature during the stay period is lower than a predetermined value (for example, 2 degrees Celsius) or more with respect to the ambient temperature immediately before the stay period.

[Step S107] The CD resting place determination unit 173 registers the staying point during the stay period in which the decrease in ambient temperature was confirmed in step S106 in the CD resting place candidate DB 150 as a CD resting place candidate. That is, if the worker to be evaluated stays at a certain point during the non-working state period and the ambient temperature drops during the staying period, the staying point is determined to be a candidate for a CD resting place.

[Step S108] The CD rest area determination unit 173 determines whether or not all the workers have been selected as evaluation targets with respect to the evaluation reference time T. If there is an unselected worker, the CD resting place determination unit 173 proceeds to step S102. If all the workers have already been selected, the CD resting place determination unit 173 proceeds to step S109.

[Step S109] The CD resting place determination unit 173 identifies the CD resting place based on the CD resting place candidates of each worker. For example, the CD resting place determination unit 173 specifies a place where the distribution of the positions of the CD resting place candidates is concentrated at a predetermined frequency or more as a CD resting place. The CD resting place determination unit 173 registers the specified CD resting place in the CD resting place DB160.

[Step S110] The CD resting place determination unit 173 determines whether or not the end condition of the CD resting place determination process is satisfied. For example, when the evaluation reference time T is later than the predetermined time, the CD resting place determination unit 173 determines that the end condition of the CD resting place determination process is satisfied. The CD resting place determination unit 173 ends the CD resting place determination process when the end condition is satisfied. If the end condition is not satisfied, the CD resting place determination unit 173 proceeds to step S111.

[Step S111] The CD resting place determination unit 173 adds a predetermined value ΔT (for example, 1 hour) to the value of the evaluation reference time T, and proceeds to the process in step S102.
In this way, the CD rest area can be determined. Hereinafter, an example of determining the CD resting place will be described with reference to FIGS. 12 to 15.

FIG. 12 is a diagram showing changes in measured values collected from a measuring instrument of one worker. As shown in FIG. 12, the movement locus of the worker is obtained based on the position of the worker at each time. In addition, the time-series change of the METs value of the worker and the time-series change of the ambient temperature can be obtained.

Among these measured values, the time-series change of the METs value is used to determine whether the worker is in a working state or a non-working state. At this time, depending on the work content, there are cases where the difference in fluctuation of the METs value during work / non-work is clear and it is easy to identify the work state / non-work state, and there are cases where it is not. For example, a light worker tends to have difficulty in understanding changes in METs values and difficult to distinguish between a working state and a non-working state.

For example, the METs value is "1" when the worker is sitting quietly. Even during a break, the movement of standing up quietly may be performed, and the METs value becomes about "1.2" when the movement of standing up quietly. A METs value of about "1.2" can be regarded as a non-working state. On the other hand, in the case of light work such as assembling small parts, the METs value may be only about "1.5", for example. Further, depending on the measurement accuracy of the measuring instrument and the mounting position, the METs value may exceed "1.5" even during a break.

Therefore, the CD rest area determination unit 173 discretizes the METs value into several stages from low to high, for example, based on the time-series change of the METs value. Next, the CD resting place determination unit 173 has a "working state estimation accuracy" (0) based on the idea that "the more the METs value higher than the predetermined value continues for a while, the higher the possibility of the working state" at each time point. ~ 1 value) is calculated at regular time intervals. The working state estimation accuracy becomes higher as the period during which the METs values higher than the predetermined values continue is longer. As the predetermined value for determining whether or not the METs value is high, a representative value such as the average or median of the METs values within the predetermined period of the worker is used. As a result, even if the worker is performing light work, the METs value higher than the predetermined value continues for a while during the work, and the work state estimation accuracy becomes high. That is, even if the METs value during work is about "1.5", if the state continues, the work state estimation accuracy becomes high, and it is possible to distinguish between the work state and the non-work state. Become. Then, the CD resting place determination unit 173 estimates, for example, "working state" when the working state estimation probability ≥ 0.5, and "non-working state" when the working state estimation probability <0.5.

FIG. 13 is a diagram showing an estimation example of a working state / non-working state. In FIG. 13, the time-series change of the METs value is shown by a solid line, and the time-series change of the working state estimation accuracy is shown by a dotted line. In FIG. 13, the horizontal axis represents time, and the vertical axis represents METs values and working state estimation accuracy. The value of the METs value is shown on the left axis, and the value of the working state estimation accuracy is shown on the right axis. The period in which the working state estimation accuracy is equal to or higher than the threshold value (for example, 0.5) is the working state period, and the period in which the working state estimation probability is less than the threshold value is the non-working state period.

In this way, the working state and the non-working state of the worker are estimated. By estimating the working state after calculating the working state estimation accuracy from the METs value, the accuracy of determining whether or not the working state is working is improved. For example, even during work, the METs value may be low for a short period of time, such as when taking a picture with a camera for work recording. Even if the METs value is low for a short period of time, the working state estimation accuracy is not lowered, and it is possible to prevent erroneous estimation as a non-working state.

It is not known whether or not the person is taking a break at the CD resting place just because he / she is not working. Therefore, the CD resting place determination unit 173 specifies the position of the CD resting place candidate by combining the METs value of the worker, the fluctuation method of the ambient temperature, and the position information.

For example, the CD resting place determination unit 173 records the position of the worker to be evaluated as a CD resting place candidate each time an event that satisfies all of the following conditions occurs.
(Condition 1) The worker has been in a non-working state for 5 minutes or more.
(Condition 2) Immediately after entering the non-working period, the ambient temperature of the worker drops by 2 degrees Celsius or more within a predetermined short period, and the ambient temperature remains low for a predetermined period.
(Condition 3) The worker stays at almost the same position during the non-working state. For example, the CD resting place determination unit 173 determines that the movement of the position during the non-working state period is within a predetermined rectangular area, the CD resting place determination unit 173 stays at substantially the same position.

FIG. 14 is a diagram showing a determination example of conditions relating to the length of the non-working state period and the decreasing tendency of the ambient temperature. In the example of FIG. 14, the period during which the worker stayed at the position C is in a non-working state, but the staying time is less than 5 minutes. Further, the ambient temperature of the worker during the period of staying at the position C is higher than the ambient temperature before that. Therefore, it is determined that the position C does not satisfy the above conditions 1 and 2 and is not a CD resting place.

The period during which the worker stayed at position A is in a non-working state, and the period of stay is 5 minutes or more. Further, the ambient temperature of the worker during the period of staying at the position A is lower than the ambient temperature before that by 2 degrees or more. Therefore, the position C is determined to be a CD rest area if the above conditions 1 and 2 are satisfied and the condition 3 is further satisfied.

FIG. 15 is a diagram showing an example of determining whether or not they are staying at the same position. For example, the CD resting place determination unit 173 shifts the position (latitude / longitude) of each worker's non-working state period in chronological order at 1-minute intervals and sets a partial section having a length of 5 minutes. create. The CD resting place determination unit 173 calculates from where to where the point clouds indicating the positions in the partial section are scattered (the longest distance) in the east-west direction and the north-south direction. Then, when the calculated distance is within the range of a rectangle of a predetermined size (for example, 5 m east-west and 5 m north-south), the CD rest area determination unit 173 determines that the start time of the partial section is "at the start of the stay state". To do.

In the example of FIG. 15, the positions of the workers in the partial section for 5 minutes are indicated by the numbers “1” to “5”. The rectangular region 51 shown by the broken line in FIG. 15 indicates the range of the point cloud indicating the position in the partial section in the east-west direction and the north-south direction. This rectangular area 51 does not fit in the range of the area of 5 m × 5 m. Therefore, it is determined that the partial sections that have moved within the rectangular region 51 do not stay at the same position.

On the other hand, within the solid rectangular area 52, five or more points indicating the positions of the operator are continuously included. The rectangular area 52 fits in the area of 5 m × 5 m. Therefore, it is determined that the partial sections that have moved within the rectangular region 52 stay at the same position.

When the partial section staying at the same position is detected, the CD resting place determination unit 173 determines the length of the partial section (as long as the position of the worker thereafter is within the rectangular range of the predetermined size). Extend (in the direction of time). When the position of the worker deviates from the range of the rectangle of the predetermined size, the CD resting place determination unit 173 sets the time immediately before that as "at the end of the stay state". Then, the CD resting place determination unit 173 sets the period from the start of the stay to the end of the stay as the period of stay as a candidate for the CD resting place. Further, the CD resting place determination unit 173 sets the representative position (for example, the center of gravity) of the point cloud indicating the position of the worker during the stay period as the position of the CD resting place candidate.

As described above, the CD resting place determination unit 173 sets the position where the person stayed during the period when the above three conditions are satisfied as the CD resting place candidate. The information on the ambient temperature for identifying the candidate CD resting place is used to determine whether or not the ambient temperature has a downward tendency. That is, if the presence or absence of the downward tendency of the ambient temperature is correctly measured, the accuracy of the absolute temperature value can be low. While working under harsh working conditions such as working in the hot summer sun, it is difficult to measure the ambient temperature with high accuracy using a measuring instrument worn by the operator, but it detects whether the ambient temperature tends to decrease. If you just do, you can measure with a simple thermometer.

Candidates for CD rest areas are identified for each worker. Even when a plurality of workers take a break at the same CD resting place, the positions of the specified CD resting place candidates are slightly deviated. Therefore, the CD resting place determination unit 173 identifies the CD resting place candidates whose positions are close to each other within a certain range, and makes one CD resting place candidate.

In order to identify the position of the CD resting place candidate, for example, the CD resting place determination unit 173 performs density-based clustering on the point cloud indicating the position of the CD resting place candidate identified from the measured value of each worker. Use to find the location (cluster) where the distribution is concentrated. Then, the CD resting place determination unit 173 determines that the CD resting place candidates corresponding to the point cloud within the range of one cluster are the same CD resting place candidates.

When the CD resting place candidate is obtained from the measured value of each worker, the CD resting place determination unit 173 determines the CD resting place candidate having a high frequency of stay of the worker as the CD resting place from the CD resting place candidates. ..
FIG. 16 is a diagram showing a determination example of a CD resting place candidate. In the example of FIG. 16, it is assumed that the CD rest area has moved to different positions in the morning and the afternoon. The CD rest area is in position A in the morning and moves to position B in the afternoon.

In FIG. 16, the time change of the ambient temperature (upper line) and the time change of the working condition accuracy (lower line) of the four workers are shown separately in the morning and the afternoon. Then, the identifier of the CD resting place candidate specified from the ambient temperature of each worker and the working condition accuracy is shown above the period of stay in the CD resting place candidate.

Since the position A is repeatedly used by a plurality of workers for breaks in the morning, it is determined that the CD resting place existed at the position A in the morning. Further, since the position B is repeatedly used by a plurality of workers for breaks in the afternoon, it is determined that the CD resting place has moved to the position B in the afternoon.

Regarding the worker s, a non-working state and a decrease in the ambient temperature are observed while staying at the position C, but this tendency is not seen in other workers. Therefore, it is presumed that position C is not a CD resting place.

In this way, the CD resting place is determined by collating the CD resting place candidates identified from the measured values of the plurality of workers. As a result, the CD resting place can be accurately determined. That is, it is difficult to accurately determine whether or not it is a CD resting place due to the small number of breaks at the CD resting place and the shortage of statistical samples based only on the measured values of individual workers. Especially when the CD resting place is not fixed and moves, if the CD resting place is judged from the long-term measurement value of one worker in order to secure the statistical sample number, for example, one CD resting place becomes It may be determined that there are CD rest areas in multiple locations even though they are moving. On the other hand, by using the CD resting place candidates obtained from the measured values of a plurality of workers, a large number of CD resting place candidates can be identified from the measured values for an appropriate period, and the correct CD resting place is determined from them. can do.

Next, the CD break state evaluation process for each worker will be described in detail.
FIG. 17 is a flowchart showing an example of the procedure of the CD break state evaluation process. Hereinafter, the process shown in FIG. 17 will be described along with the step numbers.

[Step S201] The CD break state evaluation unit 174 sets the initial value of the evaluation reference time T. For example, the CD break state evaluation unit 174 sets the time after a predetermined time has elapsed (for example, 2 hours) from the work start time of the day at the construction site as the initial value of the evaluation reference time T.

[Step S202] The CD break state evaluation unit 174 selects one of the workers who have not evaluated the evaluation reference time T from the worker profile DB 110 as the worker to be evaluated.

[Step S203] The CD break state evaluation unit 174 acquires the position information and the METs value history of the worker to be evaluated for the latest predetermined period (for example, 2 hours) of the evaluation reference time T from the measurement value history DB 120. To do.

[Step S204] The CD break state evaluation unit 174 specifies the period of stay of the worker to be evaluated at the CD rest area. For example, the CD rest state evaluation unit 174 refers to the CD rest place DB 160 and acquires a list of CD rest places at the evaluation reference time T. Then, the CD break state evaluation unit 174 compares the position information of the worker to be evaluated with the position of the CD rest place shown in the CD rest place list, and the evaluation target worker is near the position of the CD rest place. Find the length of stay (for example, within 5m).

The range of the CD resting place may be determined based on the cluster of the point cloud indicating the position of the CD resting place candidate corresponding to the CD resting place when the CD resting place is determined. For example, the CD rest state evaluation unit 174 calculates the distance between the position of the CD rest place, the farthest position, and the position of the CD rest place among the point groups indicating the positions of the CD rest place candidates corresponding to the CD rest place. .. Then, the CD rest state evaluation unit 174 sets the inside of the circular region having the calculated distance as the radius around the position of the CD rest area as the CD rest area.

[Step S205] The CD break state evaluation unit 174 determines whether or not the working state of the worker to be evaluated while staying at the CD resting place is a non-working state. For example, the CD break state evaluation unit 174 refers to the work / non-work state information of the worker to be evaluated during the stay period at the CD rest area, which is set in the worker state history DB 140, so that the non-work state Judge whether or not.

[Step S206] The CD break state evaluation unit 174 calculates the working time rate. The worker's working time rate is the ratio of the time that is the working state per unit time. For example, the CD break state evaluation unit 174 divides the total length of the periods determined to be non-working at the CD break by the length of the entire period for which the period of stay at the CD break is specified. Let be the CD break time rate. Then, the CD break state evaluation unit 174 uses a value obtained by subtracting the CD break time rate from "1" as the work time rate.

[Step S207] The CD break state evaluation unit 174 evaluates whether or not the break time of the worker to be evaluated at the CD rest area is appropriate. For example, the CD break state evaluation unit 174 sets a reference value of the work time rate for optimizing the accumulation of heat stress for each worker based on the WBGT value of the work site and the work intensity of the worker. Keep it. Then, when the work time rate exceeds the reference value, the CD break state evaluation unit 174 determines that the break at the CD rest area of the worker to be evaluated is insufficient.

The CD break state evaluation unit 174 transmits the identifier of the worker to the alert notification unit 175 when the worker's break at the CD rest area is insufficient. The alert notification unit 175 acquires, for example, the e-mail address of the corresponding worker from the worker profile DB 110, and transmits alert information including a message that the break at the CD rest area is insufficient to the e-mail address. .. The worker receives an e-mail showing the alert information by the mobile terminal and recognizes the content of the alert.

[Step S208] The CD break state evaluation unit 174 determines whether or not all the workers have been selected as evaluation targets with respect to the evaluation reference time T. If there is an unselected worker, the CD break state evaluation unit 174 advances the process to step S202. Further, if all the workers have been selected, the CD break state evaluation unit 174 proceeds to the process in step S209.

[Step S209] The CD break state evaluation unit 174 determines whether or not the end condition of the CD break state evaluation process is satisfied. For example, when the evaluation reference time T is later than the predetermined time, the CD break state evaluation unit 174 determines that the end condition of the CD break state evaluation process is satisfied. When the end condition is satisfied, the CD break state evaluation unit 174 ends the CD break state evaluation process. If the end condition is not satisfied, the CD break state evaluation unit 174 proceeds to step S210.

[Step S210] The CD break state evaluation unit 174 adds a predetermined value ΔT (for example, 1 hour) to the value of the evaluation reference time T, and proceeds to step S202.
In this way, the CD break state of each worker can be evaluated.

As shown in step S207 of FIG. 17, the CD break state evaluation unit 174 compares the reference value of the work time rate of the worker to be evaluated with the work time rate of the worker to obtain the CD. Judging whether the break time at the rest area is appropriate. The working time rate of workers changes with time.

FIG. 18 is a diagram showing an example of time-series changes in the working time rate. Since the working time rate is represented by the ratio of the working state time per unit time, the CD break state evaluation unit 174, for example, assuming that the unit time is 2 hours, during the latest 2 hours of the evaluation reference time, The time when the work state estimation accuracy exceeds the threshold value (work state time) is totaled. Then, the CD break state evaluation unit 174 obtains the work time rate of the evaluation reference time by dividing the total time of the work state by the unit time. As shown by the solid line curve in FIG. 18, the working time rate changes with time.

The reference value of the working time rate is calculated based on the working intensity level of the worker and the WBGT value of the construction site. That is, the standard value of the work time rate represents the work time per unit time allowed for the worker, but the worker who is performing heavy labor can shorten the work time per unit time by that amount. Desired. In addition, even when working in a harsh environment such as working in the hot summer sun, it is required to shorten the working time per unit time.

FIG. 19 is a diagram showing an example of calculating the working intensity level. The working intensity level can be calculated based on the METs value indicating the exercise intensity. For example, if the METs value is less than "3.0", the working intensity level is set to "1 (light)". If the METs value is "3.0" or more and less than "6.5", the working intensity level is set to "2 (medium)". Further, if the METs value is “6.5” or more, the working intensity level is set to “3 (strong)”. The graph at the bottom of FIG. 19 shows the work intensity level obtained from the time-series change of the METs value of the worker.

Guidance is provided by various organizations regarding the appropriate work time rate according to the work intensity. For example, the ACGIH guidelines divide work intensity into mild / moderate / severe levels and provide guidelines for metabolic energy at each level and examples of work content. The CD break state evaluation unit 174 sets an appropriate work time rate for the work intensity of the worker and the WBGT measurement value at the work site, based on the guideline of the work environment allowance regarding heat stress by ACGIH and the knowledge at the work site. calculate.

FIG. 20 is a diagram showing the relationship between the work intensity level, the work time rate, and the WBGT value. The work environment allowance guideline for heat stress indicates work / break patterns and the allowable WBGT value for each work intensity. For example, when performing continuous work without taking a break, a WBGT value of "30.0" can be tolerated for light work, but only a WBGT value of "26.7" can be tolerated for moderate work, which is severe. In the case of the work, only the WBGT value "25.0" can be tolerated. On the other hand, when working for 75% of the time and taking a break for 25% of the time, a WBGT value of "30.6" can be tolerated for light work, and a WBGT value of "28.0" for moderate work. Up to WBGT value "25.9" is acceptable for heavy work.

As shown in the guideline for narrow working environment, the heavier the working intensity, the lower the allowable WBGT value. Further, the larger the ratio of the break time, the higher the allowable WBGT value.

By connecting the permissible WBGT values in the work / break pattern shown in the guideline of the work environment allowance with spline complementation, the permissible WBGT value can be estimated even for the work time rate not shown in the guideline. The estimation results are shown in the graph below FIG.

The graph shown in FIG. 20 shows the threshold value of the WBGT value according to the work intensity level and the work time rate. The WBGT value threshold is the maximum value of the WBGT value at the construction site where it is permissible to work at the corresponding work intensity level and work time rate.

Further, the CD break state evaluation unit 174 obtains a reference value of the work time rate at predetermined time intervals for each worker based on the latest work intensity level.
FIG. 21 is a diagram showing an example of calculating a reference value of the working time rate. The CD break state evaluation unit 174 obtains the work intensity level at predetermined time intervals (for example, every minute) from the time-series change of the work intensity level of the worker to be evaluated. Further, the CD break state evaluation unit 174 smoothes the measured WBGT value to the average value for the last 5 minutes at the time of measurement, and obtains the WBGT value for each treatment time. Then, the CD break state evaluation unit 174 calculates the work time rate at which the WBGT value at that date and time becomes the threshold value of the WBGT value at the work intensity level at each date and time, based on the graph shown in FIG.

For example, the CD break state evaluation unit 174 holds in advance a table of WBGT thresholds (WBGT threshold table 61) corresponding to the work time rate for each work intensity level, which corresponds to the graph of the WBGT threshold value for the work intensity level and the work time rate. To do. Then, the CD break state evaluation unit 174 obtains the work time rate corresponding to the work intensity level of the worker at a certain date and time and the WBGT value at that date and time from the work time rate conversion table. The CD break state evaluation unit 174 uses the obtained work time rate as a reference value for the work time rate on that date and time.

Here, a case where the reference value of the working time rate of the date and time "2016/6/8 13:47" is obtained will be described. The work intensity level of the date and time "2016/6/8 13:47" is "1", and the WBGT value is "31.33". In this case, the column of work intensity level light (1) in the WBGT threshold table 61 is referred to. The CD break state evaluation unit 174 obtains the minimum value of the WBGT threshold value larger than the measured WBGT value "31.33", and acquires the working time rate corresponding to the corresponding WBGT threshold value. In the example of FIG. 21, the working time rate “0.5” corresponding to the WBGT threshold value “31.4000” is acquired, but if a more detailed WBGT threshold value table is used, a more accurate working time rate can be obtained. You can ask. For example, it is assumed that the working time rate "0.53" is obtained by using a detailed WBGT threshold table. The CD break state evaluation unit 174 uses the acquired work time rate "0.53" as a reference value for the work time rate on the corresponding date and time.

The CD break state evaluation unit 174 obtains the reference value of the working time rate at each date and time, and then smoothes the reference value to the average value of the latest 5 minutes of the corresponding date and time. Smoothing prevents erroneous evaluation due to peculiar values in a short period of time.

FIG. 22 is a diagram showing a comparison example between the reference value of the working time rate and the measured value of the working time rate of the worker. By smoothing the reference value of the working time rate obtained from the WBGT threshold table and the working intensity level and the WBGT value at each time point, the time change of the working time rate becomes smooth.

The reference value of the working time rate after smoothing is compared with the measured value of the working time rate of the worker, and the period during which the measured value exceeds the reference value is the target period of the alert.
Next, with reference to FIGS. 23 to 27, for the sake of simplicity, assuming that the work intensity level of each worker is almost constant throughout the day, the CD rest area was determined and the CD rest state was evaluated. A specific example of the case will be described.

FIG. 23 is a first diagram showing an example of determination of a CD resting place and evaluation of a CD resting state. For example, it is assumed that four workers are working. The work intensity level of the worker p, the worker q, and the worker r is “heavy (3)”. The work intensity level of the worker s is "light (1)".

First, the CD resting place determination unit 173 acquires the measured values of each worker in the morning, and obtains the time-series change of the ambient temperature and the time-series conversion of the working state estimation accuracy. Next, the CD resting place determination unit 173 identifies the staying point and the staying period in the non-working state period.

Then, the CD resting place determination unit 173 identifies a position where the ambient temperature is sufficiently lower than before staying at that position among the positions where each worker stayed in the non-working state period as a CD resting place candidate. To do. In the example of FIG. 23, among the characters "A", "B", and "C" indicating the positions, the characters surrounded by the dotted circles represent the CD resting place candidates.

FIG. 24 is a second diagram showing an example of determination of the CD resting place and evaluation of the CD resting state. When the CD resting place candidate can be identified, the CD resting place determination unit 173 determines whether or not the CD resting place candidate is a CD resting place. For example, the CD resting place determination unit 173 determines a position that is a candidate for a CD resting place with the number of workers × 1.5 times or more in the last 2 hours of the evaluation reference time T as a CD resting place.

In the example of FIG. 24, 10:00 am is set as the evaluation reference time. In this case, the CD resting place determination unit 173 counts the number of times the CD resting place candidate is nominated for the position that became the CD resting place candidate from 8:00 to 10:00. Then, the position A is specified as a CD resting place candidate eight times. The number of times the position B is specified as a candidate for a CD resting place is 0 times. Position C has been identified as a candidate for a CD resting place twice. Since there are four workers, a position that has been a candidate for a CD rest area six or more times is determined to be a CD rest area. In the example of FIG. 24, the position A is determined to be a CD rest area.

When the position of the CD resting place is determined, the CD resting state evaluation unit 174 evaluates the CD resting state of each worker. For example, it is assumed that the break time at the CD resting place required for a worker with a heavy work intensity level is 20 minutes, and the break time at a CD resting place required for a worker with a light work intensity level is 10 minutes. .. Worker p is resting for 25 minutes at the CD rest area during the two hours until 10 o'clock. Worker q is resting for 30 minutes at the CD rest area during the two hours until 10 o'clock. The worker r is resting for 30 minutes at the CD resting place during the two hours until 10 o'clock. Workers are resting for 12 minutes at the CD rest area during the two hours until 10 o'clock. Therefore, it can be seen that all the workers are taking sufficient breaks at the CD rest area.

The same process is repeatedly executed while shifting the evaluation reference time T.
FIG. 25 is a third diagram showing an example of determination of a CD resting place and evaluation of a CD resting state. In the example of FIG. 25, the evaluation reference time T is set to 11:00. The position A is determined to be the CD rest area by the determination of the CD rest area from the measured values of the last 2 hours until 11:00. And the worker p is resting for 15 minutes at the CD resting place during the two hours until 11:00. Worker q is resting for 25 minutes at the CD rest area during the two hours until 11:00. Worker r is resting for 30 minutes at the CD rest area during the two hours until 11:00. Workers are resting for 12 minutes at the CD rest area during the two hours until 11:00.

In this case, the worker p, whose work intensity level is heavy, has a break time at the CD rest area that is less than the required break time (20 minutes) at the CD rest area. Therefore, an alert for the worker p is notified.

After that, for the work in the afternoon, the CD resting place shall be judged and the CD resting state shall be evaluated.
FIG. 26 is a fourth diagram showing an example of determination of a CD resting place and evaluation of a CD resting state. The CD resting place determination unit 173 acquires the measured values of each worker in the afternoon, and obtains the time-series change of the ambient temperature and the time-series conversion of the working state estimation accuracy. Next, the CD resting place determination unit 173 identifies the staying point and the staying period in the non-working state period.

Then, the CD resting place determination unit 173 identifies a position where the ambient temperature is sufficiently lower than before staying at that position among the positions where each worker stayed in the non-working state period as a CD resting place candidate. To do. In the example of FIG. 23, among the characters (A, B, C) indicating the position, the characters surrounded by the dotted circles represent the candidates for the CD resting place.

FIG. 27 is a fifth diagram showing an example of determination of a CD resting place and evaluation of a CD resting state. When the CD resting place candidate can be identified, the CD resting place determination unit 173 determines whether or not the CD resting place candidate is a CD resting place. In the example of FIG. 27, 15:00 (3:00 pm) is set as the evaluation reference time. In this case, the CD resting place determination unit 173 counts the number of times the CD resting place candidate is nominated for the position that became the CD resting place candidate from 13:00 to 15:00. Then, the position A is specified as a CD resting place candidate once. Position B has been identified as a candidate for a CD resting place seven times. Position C has been identified as a candidate for a CD resting place three times. Since there are four workers, a position that has been a candidate for a CD rest area six or more times is determined to be a CD rest area. In the example of FIG. 27, the position B is determined to be a CD rest area.

When the position of the CD resting place is determined, the CD resting state evaluation unit 174 evaluates the CD resting state of each worker. Worker p is resting for 20 minutes at the CD rest area during the two hours until 15:00. Worker q is resting for 15 minutes at the CD rest area during the two hours until 15:00. The worker r is resting for 30 minutes at the CD resting place during the two hours until 15:00. The worker s did not take a rest at the CD resting place during the two hours until 15:00.

For the worker s, the break time at the CD rest area is less than the required break time (10 minutes) at the CD rest area. Therefore, an alert for the worker s is notified.
In this way, even if the CD resting place moves to a place different from the morning in the afternoon, the position of the CD resting place can be correctly determined. As a result, it can be correctly determined whether each worker is taking an appropriate break at the CD rest area.

[Other embodiments]
In the second embodiment, the alert information is transmitted to the mobile terminal owned by the worker, but if the measuring instrument has an alert display function, the alert information can also be transmitted to the measuring instrument. ..

Further, in the second embodiment, the work intensity level of each worker is determined from the METs value, but when the work intensity level of the worker is known in advance and almost the same work is performed, it is set in the profile. The basic work strength of the worker may be used as the work strength level of the worker.

Although the embodiment has been illustrated above, the configuration of each part shown in the embodiment can be replaced with another having the same function. Moreover, other arbitrary components and processes may be added. Further, any two or more configurations (features) of the above-described embodiments may be combined.

The following additional notes will be further disclosed with respect to the above embodiments.
(Appendix 1) To the computer
Acquire a measurement history showing the results of periodically measuring the exercise intensity, location, and ambient temperature of multiple workers.
Each of the plurality of workers is selected as a different observation target worker,
Based on the time-series change of the exercise intensity of the observation target worker, the non-working state period in which the observation target worker is in the non-working state is specified.
Based on the time-series change of the location position of the observation target worker, the stay position indicating the position of the area where the observation target worker has stayed continuously for a predetermined time or more within the non-working state period is specified.
Based on the time-series change of the ambient temperature of the observation target worker, the presence or absence of a temperature decrease tendency that the ambient temperature during the stay is lowered by a predetermined temperature or more as compared with that before the observation target worker stays in the region. Judge,
The position of the region determined to have a tendency to decrease in temperature is specified as a resting place candidate according to the operator to be observed.
As a result of each of the plurality of workers being selected as the observation target and specifying the resting place candidate according to each of the plurality of workers, the position specified as the resting place candidate more than a predetermined number of times is appropriately selected. Judging as the location of a break,
A judgment program that executes processing.

(Appendix 2) In the determination of the position of the resting place, each of a plurality of times at a predetermined time interval is set as an evaluation reference time, and the exercise intensity measured within a predetermined period up to the evaluation reference time for each evaluation reference time. And the position of the resting place within a predetermined period up to the evaluation reference time is determined from the resting place candidates specified based on the location position and the ambient temperature.
Judgment program described in Appendix 1.

(Appendix 3) In addition to the computer
Select the evaluation target worker to be evaluated from the plurality of workers, and select the evaluation target worker.
Based on the time-series change of the location position of the evaluation target worker, the evaluation target per unit time when the period during which the evaluation target worker is not staying at the resting place is defined as the working time. Calculate the work time rate indicating the ratio of the work time of the worker,
When the work time rate exceeds the work time rate reference value indicating the ratio of the work time allowed to the evaluation target worker per unit time, alert information is output.
The determination program according to Appendix 1 or 2.

(Appendix 4) In addition to the computer
Based on the time-series change of the exercise intensity of the evaluation target worker, the time-series change of the work intensity level indicating the work strength of the evaluation target worker was calculated.
Based on the time-series change of the work intensity level, the time-series change of the work time rate reference value is calculated.
In the calculation of the work time rate, the time series change of the work time rate is calculated based on the time series change of the location position of the worker to be evaluated.
In the output of the alert information, the time-series change of the working time rate and the time-series change of the working time rate reference value are compared, and when there is a period in which the working time rate exceeds the working time rate reference value. , Output the alert information,
Judgment program described in Appendix 3.

(Appendix 5) The computer
Acquire a measurement history showing the results of periodically measuring the exercise intensity, location, and ambient temperature of multiple workers.
Each of the plurality of workers is selected as a different observation target worker,
Based on the time-series change of the exercise intensity of the observation target worker, the non-working state period in which the observation target worker is in the non-working state is specified.
Based on the time-series change of the location position of the observation target worker, the stay position indicating the position of the area where the observation target worker has stayed continuously for a predetermined time or more within the non-working state period is specified.
Based on the time-series change of the ambient temperature of the observation target worker, the presence or absence of a temperature decrease tendency that the ambient temperature during the stay is lowered by a predetermined temperature or more as compared with that before the observation target worker stays in the region. Judge,
The position of the region determined to have a tendency to decrease in temperature is specified as a resting place candidate according to the operator to be observed.
As a result of each of the plurality of workers being selected as the observation target and specifying the resting place candidate according to each of the plurality of workers, the position specified as the resting place candidate more than a predetermined number of times is appropriately selected. Judging as the location of a break,
Judgment method.

(Appendix 6) A storage unit that stores measurement history showing the results of periodic measurement of exercise intensity, location, and ambient temperature of multiple workers.
Each of the plurality of workers is selected as a different observation target worker, and the observation target worker is in a non-working state based on a time-series change in the exercise intensity of the observation target worker. A stay position indicating the position of an area in which the observation target worker has continuously stayed for a predetermined time or longer within the non-working state period based on the time-series change of the location position of the observation target worker. Is specified, and based on the time-series change of the ambient temperature of the observation target worker, the ambient temperature during the stay is lowered by a predetermined temperature or more as compared with that before the observation target worker stays in the region. The presence or absence of a tendency is determined, the position of the region determined to have a tendency to decrease in temperature is specified as a resting place candidate according to the observation target worker, and each of the plurality of workers is the observation target person. As a result of identifying the resting place candidate according to each of the plurality of workers, a processing unit that determines a position specified as the resting place candidate more than a predetermined number of times as an appropriate resting place position.
Judgment device having.

(Appendix 7) Multiple measuring instruments, each of which is worn by each of a plurality of workers, periodically measures the exercise intensity, location, and ambient temperature of the wearing worker.
The measurement results of the exercise intensity, the location position, and the ambient temperature are collected from each of the plurality of measuring instruments, and each of the plurality of workers is selected as a different observation target worker, and the observation target work is performed. Based on the time-series change of the exercise intensity of the person, the non-working state period in which the observed worker is in the non-working state is specified, and based on the time-series change of the location position of the observed worker, the said The stay position indicating the position of the area where the observation target worker stayed continuously for a predetermined time or more within the non-working state period is specified, and the observation is performed based on the time-series change of the ambient temperature of the observation target worker. It is determined whether or not the ambient temperature during the stay of the target worker tends to decrease by a predetermined temperature or more as compared with before the stay in the area, and the position of the area determined to have the tendency to decrease is determined. As a result of specifying as a resting place candidate according to the observation target worker, each of the plurality of workers is selected as the observation target person, and the resting place candidate corresponding to each of the plurality of workers is specified. A determination device that determines the position identified as the resting place candidate more than a predetermined number of times as an appropriate resting place position.
Judgment system with.

1a, 1b, 1c, 1d Worker 2a, 2b, 2c, 2d Measuring instrument 10 Judgment device 11 Storage unit 12 Processing unit

Claims (6)

On the computer
Acquire a measurement history showing the results of periodically measuring the exercise intensity, location, and ambient temperature of multiple workers.
Each of the plurality of workers is selected as a different observation target worker,
Based on the time-series change of the exercise intensity of the observation target worker, the non-working state period in which the observation target worker is in the non-working state is specified.
Based on the time-series change of the location position of the observation target worker, the stay position indicating the position of the area where the observation target worker has stayed continuously for a predetermined time or more within the non-working state period is specified.
Based on the time-series change of the ambient temperature of the observation target worker, the presence or absence of a temperature decrease tendency that the ambient temperature during the stay is lowered by a predetermined temperature or more as compared with that before the observation target worker stays in the region. Judge,
The position of the region determined to have a tendency to decrease in temperature is specified as a resting place candidate according to the operator to be observed.
As a result of each of the plurality of workers being selected as the observation target worker and specifying the resting place candidate according to each of the plurality of workers, the position specified as the resting place candidate more than a predetermined number of times is determined. Judge as an appropriate resting place position,
A judgment program that executes processing. In the determination of the position of the resting place, each of a plurality of times at a predetermined time interval is set as an evaluation reference time, and the exercise intensity and the location position measured within a predetermined period up to the evaluation reference time for each evaluation reference time. The position of the resting place within the predetermined period up to the evaluation reference time is determined from the resting place candidates specified based on the ambient temperature.
The determination program according to claim 1. On the computer,
Select the evaluation target worker to be evaluated from the plurality of workers, and select the evaluation target worker.
Based on the time-series change of the location position of the evaluation target worker, the evaluation target per unit time when the period during which the evaluation target worker is not staying at the resting place is defined as the working time. Calculate the work time rate indicating the ratio of the work time of the worker,
When the work time rate exceeds the work time rate reference value indicating the ratio of the work time allowed to the evaluation target worker per unit time, alert information is output.
The determination program according to claim 1 or 2. On the computer,
Based on the time-series change of the exercise intensity of the evaluation target worker, the time-series change of the work intensity level indicating the work strength of the evaluation target worker was calculated.
Based on the time-series change of the work intensity level, the time-series change of the work time rate reference value is calculated.
In the calculation of the work time rate, the time series change of the work time rate is calculated based on the time series change of the location position of the worker to be evaluated.
In the output of the alert information, the time-series change of the working time rate and the time-series change of the working time rate reference value are compared, and when there is a period in which the working time rate exceeds the working time rate reference value. , Output the alert information,
The determination program according to claim 3. The computer
Acquire a measurement history showing the results of periodically measuring the exercise intensity, location, and ambient temperature of multiple workers.
Each of the plurality of workers is selected as a different observation target worker,
Based on the time-series change of the exercise intensity of the observation target worker, the non-working state period in which the observation target worker is in the non-working state is specified.
Based on the time-series change of the location position of the observation target worker, the stay position indicating the position of the area where the observation target worker has stayed continuously for a predetermined time or more within the non-working state period is specified.
Based on the time-series change of the ambient temperature of the observation target worker, the presence or absence of a temperature decrease tendency that the ambient temperature during the stay is lowered by a predetermined temperature or more as compared with that before the observation target worker stays in the region. Judge,
The position of the region determined to have a tendency to decrease in temperature is specified as a resting place candidate according to the operator to be observed.
As a result of each of the plurality of workers being selected as the observation target worker and specifying the resting place candidate according to each of the plurality of workers, the position specified as the resting place candidate more than a predetermined number of times is determined. Judge as an appropriate resting place position,
Judgment method. A storage unit that stores measurement history that shows the results of periodic measurement of exercise intensity, location position, and ambient temperature of multiple workers.
Each of the plurality of workers is selected as a different observation target worker, and the observation target worker is in a non-working state based on a time-series change in the exercise intensity of the observation target worker. A stay position indicating the position of an area in which the observation target worker has continuously stayed for a predetermined time or longer within the non-working state period based on the time-series change of the location position of the observation target worker. Is specified, and based on the time-series change of the ambient temperature of the observation target worker, the ambient temperature during the stay is lowered by a predetermined temperature or more as compared with that before the observation target worker stays in the region. The presence or absence of a tendency is determined, the position of the region determined to have a tendency to decrease in temperature is specified as a resting place candidate according to the observation target worker, and each of the plurality of workers is assigned to the observation target work. As a result of identifying the resting place candidate according to each of the plurality of workers selected as a person, a processing unit that determines a position identified as the resting place candidate more than a predetermined number of times as an appropriate resting place position. ,
Judgment device having.

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