JP2020125923A - Indoor space work support system - Google Patents

Abstract

To provide an indoor space work support system capable of acquiring and accumulating biometric information and position information of a worker even in an indoor space by means of a wearable device worn by the worker.SOLUTION: An indoor space work support system 1 includes: at least three or more access points 2 that are installed at predetermined positions in an indoor space wirelessly communicably with each other; a wearable device 3 that is wirelessly communicable with the access points 2 and that is worn by a worker; and a server 4 connected to at least one of the access points. Each access point transmits a radio wave carrying each position information, the wearable device acquires biometric information of the worker and reception intensity and position information of the radio wave at each access point and transmits the same to the server, and the server stores the received biometric information and reception intensity and position information in association with a system time and calculates a position of the worker based on the reception intensity and the position information.SELECTED DRAWING: Figure 1

Description

The present invention relates to an indoor space work support system that uses a wearable device worn by a worker to improve work efficiency when working in an indoor space and assist the worker in safety management.

Sometimes work is done in an enclosed space indoors, such as underground, in a tunnel or in a ship. Worksites in such enclosed spaces are generally poorly ventilated, and are in a hot and humid environment.In addition, workers should wear protective clothing such as long-sleeved long pants and helmets for safety. In many cases, it is a harsh site where there is a high risk for safety and health, such as heat stroke due to inability to control body temperature due to perspiration and air convection. Further, in such a site, the environment may be harsh, and many workers are worried about lack of manpower due to aging of workers and decrease of skilled workers. Therefore, improvement of productivity and safety of workers has become an urgent issue.

On the other hand, in recent years, research and development of wearable devices have been actively conducted in various fields. The wearable device is a computer device that has various forms such as a wrist watch type, a spectacle type, and a clothes type, and can be worn by a user. Among them, wearable devices are expected to be applied to the health monitoring field because they can be worn at all times. Conventionally, when measuring biological information such as an electrocardiogram, it is common to attach a disposable electrode to the skin of the person to be measured with a gel or adhesive tape, etc. When the measurement is performed, it is difficult to measure biological information such as discomfort caused by sweating or a rash on the electrode sticking part or peeling off of the gel or the adhesive tape. For such conventional measurement of biological information, for example, in Patent Document 1, a wearer has an electrode inside a garment and wears the garment without using an adhesive member such as gel or adhesive tape. There is disclosed a clothes-type wearable device capable of measuring an electrocardiogram even during a walking motion or a motion motion such as a running motion, when the electrode comes into contact with the skin when the user wears it. By using the wearable device as described in Patent Document 1, it is possible to easily measure the biological information for a long time or during exercise. Further, Patent Document 1 suggests that position information can be obtained by combining with GPS (Global Positioning System, Global Positioning System).

JP, 2017-029692, A

As described above, at the work site of the indoor closed space, improvement of productivity and safety of workers has become a problem. As a means for solving this problem, by acquiring and accumulating biometric information and position information during the work of the worker, and analyzing the obtained data, the analysis result is the efficiency of the worker's action, risk avoidance, It may be used for prevention of poor physical condition. For example, by analyzing flow patterns such as movement distance, route, speed, and staying time from position information, it is possible to improve the work layout to avoid unnecessary movement and staying time, heart rate, body temperature, etc. Take a break before lowering work efficiency or falling into poor physical condition by performing trend analysis such as the relationship between changes in physical information of physical condition and physical condition change, and the relationship between biological information and work content or flow line pattern. It is thought that productivity and safety can be improved by issuing warnings as described above. For that purpose, first, it is necessary to acquire the biometric information and the position information of the worker.

In order to acquire the biometric information and the position information of the worker, it is considered effective to use the wearable device as described in Patent Document 1 so as not to interfere with the work even if the wearable device is worn for a long time. .. However, as for position information, conventionally, it is general to use GPS as suggested in Patent Document 1, and since GPS acquires position information by radio waves from satellites, there is a problem here. The location information could not be obtained indoors.

The present invention has been made in view of the above circumstances, and it is possible to acquire and store biometric information and position information of an operator even in an indoor space by using a wearable device worn by the operator. It is an object to provide an indoor space work support system that can perform.

In order to solve the above-mentioned problems, an indoor space work support system according to the present invention performs work in the indoor space with at least three access points installed in a predetermined position of the indoor space so as to be capable of wireless communication with each other. A wearable device worn by an operator who performs wireless communication with each of the access points, and a server communicatively connected to at least one of the access points, the access point comprising: , Each of which is provided with a position information identifier indicating the position information of the installed position, transmits a radio wave carrying the position information identifier with a constant output intensity, the wearable device, the biological body to obtain the biometric information of the worker The wearable device includes an information acquisition unit and a reception intensity acquisition unit that acquires the reception intensity of the radio wave transmitted from the access point and the position information identifier, and the wearable device is the biological body obtained by the biometric information acquisition unit. The information and the reception intensity and the position information identifier for each access point acquired by the reception intensity acquisition means are transmitted to the server via the access point, and the server holds the system time. Clock means for clocking, storage means for storing the biological information sent from the wearable device, the reception intensity and the position information identifier for each access point, in association with the system time by the clock means Calculating an estimated distance from each access point based on the reception intensity and the output intensity associated with the same system time stored in the storage unit, and the position information identifier for each access point and the A position calculating unit that calculates the position of the wearable device based on the estimated distance.

Preferably, the indoor space work support system according to the present invention is characterized in that the wearable device is clothes-type smart wear worn on an upper half of a worker.

Preferably, the indoor space work support system according to the present invention is characterized in that the biological information includes at least heartbeat information.

Preferably, the indoor space work support system according to the present invention is characterized in that the access point and the wearable device perform wireless communication according to a wireless communication standard based on Bluetooth Low Energy (Bluetooth: registered trademark).

Preferably, in the indoor space work support system according to the present invention, the wearable device further includes an auxiliary device, the auxiliary device includes an auxiliary control unit, an auxiliary clock unit that holds an internal time and measures the time, and the living body. Auxiliary storage means for storing the biometric information acquired by the information acquisition means in association with the internal time by the auxiliary clock means, the auxiliary control means wirelessly communicating between the wearable device and the access point. Is disconnected, the biometric information is stored in the auxiliary storage unit in association with the internal time, and when the wireless communication between the wearable device and the access point is restored, the clock unit of the server A difference between a system time and the internal time of the auxiliary clock means is calculated, and based on the difference, at the time of obtaining the biometric information linked to the biometric information stored in the auxiliary storage means during the disconnection. It is characterized in that the internal time is corrected to the system time of the same time, and the biometric information associated with the corrected system time is transmitted to the server and stored in the storage means.

According to the indoor space work support system of the present invention, the wearable device is attached to the body of the worker who works in the indoor space, and the biometric information of the worker can be acquired by the biometric information acquisition means of the wearable device. it can. In the indoor space, at least three or more access points that are installed at predetermined positions and can wirelessly communicate with each other and also wirelessly communicate with a wearable device, and at least one of these access points can communicate with a server. It is connected to the. Each access point transmits a radio wave carrying a position information identifier indicating its own position information at a constant output intensity, and the wearable device acquires the reception intensity of the radio wave transmitted from each access point and the reception intensity of the position information identifier. Get by means. The biometric information of the worker acquired by the wearable device and the reception intensity and position information identifier for each access point are transmitted to the server via the access point and are linked to the system time of the clock means of the server. It is stored in the storage means. The position calculation means of the server calculates the estimated distance from the access point based on the reception intensity of the radio wave received from the access point stored in the storage means and the output intensity of the radio wave transmitted by the access point, and the same system time is calculated. The position information of the worker at the system time can be acquired by calculating the position of the wearable device based on the estimated distances calculated for the plurality of access points and the position information of the access point. As described above, the indoor space work support system according to the present invention can acquire and store the biometric information and the position information of the worker in the indoor space.

Preferably, the indoor space work support system according to the present invention, the wearable device is a clothing type smart wear to be worn on the upper body of the worker, so that the worker only wears the clothing type smart wear, Since the electrodes and sensors provided on the smart wear can be arranged at predetermined positions on the body of the worker, the worker does not need to have knowledge about the arrangement of the electrodes and the sensor, and can be simply and appropriately arranged. It is possible to measure biometric information and position information of an operator.

Preferably, in the indoor space work support system according to the present invention, since the biological information includes at least heartbeat information, it is possible to perform trend analysis of heartbeat variability. Heartbeat is considered to be affected by various factors such as the fatigue level and physical condition of the worker, the environment of the workplace and the work content.Therefore, by performing a trend analysis of these various factors and heartbeat variability, the results can be obtained. It may be used for improving work efficiency and predicting poor physical condition.

Preferably, in the indoor space work support system according to the present invention, the access point and the wearable device perform wireless communication according to a wireless communication standard conforming to Bluetooth Low Energy (Bluetooth: registered trademark). Since the electric power is extremely small, a large battery or the like is not required, and the access point and the wearable device can have a long life and can be miniaturized.

Preferably, in the indoor space work support system according to the present invention, the wearable device further includes an auxiliary device, and while the wearable device disconnects the wireless communication between the wearable device and the access point, the wearable device biometric The biometric information acquired by the information acquisition unit can be stored in the auxiliary storage unit of the auxiliary device. Then, when the wireless communication between the wearable device and the access point is restored, the biometric information acquired during disconnection and stored in the auxiliary device is associated with the time information corrected to the system time during disconnection and stored in the server. It can be stored in the means. Therefore, even when the worker wearing the wearable device goes out of the wireless communication range of the access point, the biometric information during that time can be seamlessly acquired and stored in the storage means of the server.

1 is a schematic configuration plan view of an indoor space work support system according to an embodiment of the present invention. The functional block diagram of the access point of the indoor space work support system which concerns on one Embodiment of this invention. 1 is a schematic configuration diagram of a wearable device of an indoor space work support system according to an embodiment of the present invention. 1 is a functional block diagram of a wearable device of an indoor space work support system according to an embodiment of the present invention. The functional block diagram of the server of the indoor space work support system concerning one embodiment of the present invention.

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the indoor space work support system 1 according to the present embodiment includes a plurality of access points 2 installed at predetermined positions in the indoor space S and an operator performing work in the indoor space S. It comprises a wearable device 3 to be worn and a server 4 communicatively connected to at least one access point 2. Since the indoor space work support system 1 can acquire and store the biometric information and the position information of the worker, by analyzing them, the productivity and safety of the worker W at the time of working in the indoor space S can be improved. It is possible to improve. Hereinafter, each component of the indoor space work support system 1 will be described in detail.

As shown in FIG. 2, the access point 2 includes a control unit 21, a BLE communication unit 22, and a wireless LAN communication unit 23, each of which is capable of communicating various data with each other via a bus 24. There is.

The control unit 21 controls the BLE communication unit 22 and the wireless LAN communication unit 23. The respective functions of the BLE communication unit 22 and the wireless LAN communication unit 23 are executed under the control of the control unit 21. The control unit 21 may be configured to include, for example, a CPU and a memory, and various programs stored in the memory may be arithmetically processed by the CPU to perform various controls according to the programs. The program stored in the memory can be input or rewritten via the BLE communication unit 22 or the wireless LAN communication unit 23, or via an external storage device or the like which is provided with a connector at the access point 2 and connected to the connector. It may be configured as follows. Further, similarly, the position information identifiers respectively provided in the access points 2 may be configured so that they can be input or rewritten in the memory.

The position information identifier indicates the position information of the position in the indoor space S where each access point 2 is installed. The position information indicated by the position information identifier is such that at least the position on the horizontal plane in the indoor space S can be known. For example, the coordinate system of two axes orthogonal to the horizontal plane of the indoor space S is set, and the coordinate system The coordinates at can be used. As the position information identifier, such coordinate data itself may be used, or character data such as alphabets or numbers that can be identified by each access point 2 may be assigned and used. When the character data is used as the position information identifier, data for associating the character data with the coordinate data is acquired in advance and stored in the storage means 43 of the server 4 described later, and the position calculation of the server 4 described later is performed. The means 44 may be capable of obtaining coordinate data from the character data. Any position calculation means 44 of the server 4 may be used as long as the position information can be known from the position information identifier of each access point 2.

The BLE communication unit 22 transmits and receives a radio wave that complies with the wireless communication standard of Bluetooth Low Energy (Bluetooth: registered trademark) (hereinafter referred to as BLE), and the access point 2 receives other radio waves via the BLE communication unit 22. It is configured such that various types of data can be wirelessly communicated with a BLE-compliant device. Each access point 2 is installed at a position where it can wirelessly communicate with at least one other access point 2 by the BLE communication means 22, so that the data received by a certain access point 2 can be transmitted to any access point 2. It has become. In addition, each access point 2 is configured to transmit, by the BLE communication unit 22, the BLE radio waves carrying the respective position information identifiers with a constant output intensity. The output intensity data can be used by the position calculating means 44 of the server 4, which will be described later.

The wireless LAN communication unit 23 transmits and receives radio waves that comply with the wireless communication standard of the wireless LAN, and the access point 2 communicates with other devices that comply with the same wireless LAN standard via the wireless LAN communication unit 23. It is configured such that various data can be wirelessly communicated between them. It is preferable that the wireless LAN standard conforms to Wi-Fi (registered trademark), for example. At least one access point 2 can transmit and receive various data to and from the server 4 via the wireless LAN communication means 23. In the example shown in FIG. 1, the server 4 is installed at a position where wireless communication is possible with the access point 2 installed near the entrance of the indoor space S, and is connected to the access point 2 so that wireless communication is possible. .. The wireless LAN communication unit 23 may be provided only at the access point 2 connected to the server 4. Further, in the present embodiment, the connection between the access point 2 and the server 4 is made by wireless communication by the wireless LAN communication means 23, but wired connection using a communication cable or the like may be used. In addition, in place of the server 4 in FIG. 1, a router connected to the Internet that can communicate with the access point 2 is installed in place of the server 4, and the server 4 is installed in another place. And may be configured to be communicatively connected via the Internet.

The access point 2 is configured using, for example, a Raspberry Pi Zero W, which is a single board computer equipped with the functions of Wi-Fi (registered trademark) and BLE, which is available from the Raspberry Pi Foundation in England or its agent. May be. The Raspberry Pi Zero W is available at a low price, has a size of 65 mm x 30 mm x 5 mm (catalog value), and can be driven by a mobile battery, etc. is there.

As shown in FIG. 3, the wearable device 3 includes wear 31, which is worn on the upper half of the body of an operator, two electrodes 32 and wirings 33, a main device 36, and an auxiliary device 37. The electrode 32, the wiring 33, and the main device 36 are attached to the wear 31. The auxiliary device 37 may be attached to the wear 31 or may be carried by an operator.

The wear 31 is a garment that, when worn by the worker, covers the trunk of the upper body of the worker, directly touches the worker's body, and adheres closely to the worker's body. It is made of a highly elastic material so that it can follow.

The electrode 32 is fixed to a predetermined position on the back side of the wear 31, and when the worker wears the wear 31, the electrode 32 comes into contact with a predetermined position on the body surface of the worker. The electrodes 32 are used to measure an electrical signal generated in the body of the worker, and in the present embodiment, since the heartbeat information regarding the heartbeat is acquired, the two electrodes 32 are worn by the worker on the wear 31. The wear 31 is provided so as to contact the left and right positions of the chest of the operator such that the heart is sandwiched between the two electrodes 32. Thereby, the state of electrical activity of the worker's heart is observed via the electrodes 32 on the body surface. The electrode 32 is a dry electrode, and is not attached to the body surface of the worker by using an adhesive member such as gel or adhesive tape. The fixed electrode 32 also comes into contact with the operator's body. Therefore, even if it is worn for a long time, skin irritation and discomfort are less likely to occur. The electrode 32 comes into contact with the body of the worker when the wear 31 is in close contact with the body of the worker. Therefore, the electrode 32 moves in accordance with the expansion and contraction of the wear 31 due to the body movement of the worker. It is preferably made of a material having elasticity so that it can follow and expand and contract, and conductivity so that an electric signal can be measured even during expansion.

The wiring 33 is fixed to the wear 31 and connects the electrode 32 and the main device 36. The electrical signal obtained by the electrode 32 is sent to the main device 36 via the wiring 33. Since the wiring 33 is also fixed to the wear 31 like the electrode 32, it is preferable that the wiring 33 is formed of a material having elasticity and conductivity according to the expansion and contraction of the wear 31.

The electrodes 32 and the wirings 33 can be configured using, for example, COCOMI (registered trademark) manufactured by Toyobo Co., Ltd. COCOMI (registered trademark) is a thin film functional material having high elasticity and conductivity, and has a three-layer structure in which both sides of a conductive sheet are covered with an insulating sheet, and is easily attached to a cloth by thermocompression bonding. Can be pasted. By attaching COCOMI (registered trademark) to the back side of the wear 31 and peeling off the insulating sheet of the portion used as the electrode 32 to expose the conductive sheet, the exposed conductive portion of the conductive sheet is covered with the electrode 32 and the insulating sheet. The electrode 32 and the wiring 33 can be integrally formed by using the insulating portion as the wiring 33. When the electrode 32 and the wiring 33 are integrally formed in this way, a step or the like does not occur at the connecting portion between the electrode 32 and the wiring 33, so that the connecting portion impairs the comfort of wearing, and the connecting portion gets distracted during work. It is possible to reduce the possibility of being caught.

As shown in FIG. 4, the main device 36 includes a control unit 361, a biological information acquisition unit 362, a reception intensity acquisition unit 363, an input/output unit 364, and a BLE communication unit 365, each of which has a bus 366. Various data can be communicated with each other via the.

The control unit 361 controls the biometric information acquisition unit 362, the reception intensity acquisition unit 363, the input/output unit 364, and the BLE communication unit 365. The functions of the biometric information acquisition unit 362, the reception intensity acquisition unit 363, the input/output unit 364, and the BLE communication unit 365 are executed under the control of the control unit 361. The control unit 361 may be configured to include, for example, a CPU and a memory, and the CPU may perform arithmetic processing on various programs stored in the memory to perform various controls according to the programs. The program stored in the memory may be configured to be rewritable or rewritable via the BLE communication unit 365 or an external storage device connected to the input/output unit 364.

The biological information acquisition unit 362 includes a heartbeat sensor 3621, a temperature sensor 3622, and an acceleration sensor 3623. The biometric information acquisition unit 362 acquires the heartbeat information of the worker by the heartbeat sensor 3621, the body surface temperature information of the worker by the temperature sensor 3622, and the posture information of the worker by the acceleration sensor 3623, respectively, as biometric information.

The heartbeat sensor 3621 acquires the potential difference between the two electrodes 32 as heartbeat information based on the electrical signal input from the two electrodes 32 to the main device 36. The heart beats when an electrical signal of an action potential generated in a sinoatrial node located near the right atrium is sequentially transmitted to the entire heart by the stimulus conduction system, and the myocardium contracts due to the electrical signal. Therefore, the heartbeat information, which is the information regarding the pulsation of the heart, can be acquired by observing the fluctuation of the electric potential of the heart caused by the conduction of the electric signal. Since the two electrodes 32 are in contact with the left and right sides of the chest of the worker so as to sandwich the heart, the potential difference between the two electrodes 32 is acquired to observe the fluctuation of the heart potential from the body surface. .. From the potential difference between the two electrodes 32 acquired by the heartbeat sensor 3621, information regarding the heartbeat such as the heartbeat rate and the heartbeat waveform can be obtained.

The temperature sensor 3622 acquires the body surface temperature of the worker. For example, a general temperature sensor such as an IC temperature sensor that outputs a change in resistance value due to a change in temperature as a voltage can be used.

The acceleration sensor 3623 acquires, as posture information, accelerations with respect to the three axes of the Cartesian coordinate system set in the main device 36. Since the orientation of the main device 36 can be calculated based on the triaxial acceleration obtained by the acceleration sensor 3623, it is possible to obtain information on the posture of the worker who wears the wearable device 3 including the main device 36. it can.

The reception strength acquisition unit 363 detects the BLE radio waves carrying the respective position information identifiers transmitted by the BLE communication unit 22 of each access point with a constant output intensity, and the reception intensity and position information of each radio wave. Get the identifier and.

The input/output unit 364 includes a connector to which an external device is connected, and the main device 36 is configured to be able to transmit/receive various data to/from the external device connected to the input/output unit 364. .. The input/output unit 364 includes a connector to which the two wires 33 are connected. Each of the wirings 33 has a connector that can be connected to the input/output unit 364 at the end opposite to the electrode 32. When the main device 36 is attached to the wear 31, the wiring 33 is connected to the input/output unit 364. ing.

The BLE communication unit 365 transmits and receives radio waves conforming to BLE, and the main device 36 can perform wireless communication of various data with other BLE-compliant devices via the BLE communication unit 365. Configured to be able to. Each access point 2 includes a BLE communication unit 22, and the main device 36 can transmit and receive various data to and from each access point 2 via the BLE communication unit 365. Further, the auxiliary device 37 includes a BLE communication unit 374 described later, and the main device 36 can transmit and receive various data to and from the auxiliary device 37 via the BLE communication unit 365.

The main device 36 may be configured using, for example, a heart rate sensor WHS-2 (WHS: registered trademark) manufactured by Union Tool Corporation. Since the WHS-2 has a function of measuring heartbeat information, body surface temperature and triaxial acceleration, and a wireless communication function by BLE, the main device 36 can be easily configured by using the WHS-2.

The auxiliary device 37 includes an auxiliary control unit 371, an auxiliary clock unit 372, an auxiliary storage unit 373, and a BLE communication unit 374, each of which is capable of communicating various data with each other via a bus 375. ..

The auxiliary control unit 371 controls the auxiliary clock unit 372, the auxiliary storage unit 373, and the BLE communication unit 374. The functions of the auxiliary clock means 372, the auxiliary storage means 373, and the BLE communication means 374 are executed under the control of the auxiliary control means 371. The auxiliary control unit 371 may be configured to include, for example, a CPU and a memory, and various types of control according to the program may be performed by the CPU performing arithmetic processing on various programs stored in the memory. The program stored in the memory may be configured to be input or rewritable via the BLE communication unit 374.

The auxiliary clock means 372 holds the internal time and measures the time. The internal time of the auxiliary clock means 372 is clocked independently of the system time by the clock means 42 of the server 4 described later.

The auxiliary storage unit 373 can store various data and is configured by, for example, a flash memory or the like. The auxiliary storage unit 373 assists the biometric information acquired by the biometric information acquisition unit 362 sent from the main device 36 to the auxiliary device 37 when the main device 36 cannot perform wireless communication with any access point 2. The internal time of the clock means 372 can be linked and stored.

The BLE communication unit 374 performs transmission/reception of BLE-compliant radio waves, and the auxiliary device 37 can perform wireless communication of various data with other BLE-compliant devices via the BLE communication unit 374. Configured to be able to. The main device 36 includes a BLE communication unit 365, and the auxiliary device 37 can transmit and receive various data to and from the main device 36 via the BLE communication unit 374.

The server 4 includes a control unit 41, a clock unit 42, a storage unit 43, a position calculation unit 44, and a wireless LAN communication unit 45, each of which is capable of communicating various data with each other via a bus 46. Has been done.

The control unit 41 controls the clock unit 42, the storage unit 43, the position calculation unit 44, and the wireless LAN communication unit 45. The functions of the clock means 42, the storage means 43, the position calculation means 44, and the wireless LAN communication means 45 are executed under the control of the control means 41. The control unit 41 may be configured to include, for example, a CPU and a memory, and various types of control according to the program may be performed by the CPU processing various programs stored in the memory. The program stored in the memory may be input or rewritten via the wireless LAN communication unit 45, or via an external storage device or the like provided with a connector on the server 4 and connected to the connector. Good.

The clock means 42 holds the system time and measures the time. The system time of the clock means 42 may be, for example, the standard time of the area where the indoor space S exists. The system time of the clock means 42 may be configured such that the server 4 is connected to the Internet and is regularly calibrated by NTP (Network Time Protocol) based on Coordinated Universal Time (UTC).

The storage unit 43 can store various data, and is configured by using a general storage device such as an HDD (Hard Dis Drive) or a flash memory. The storage unit 43 stores the biometric information of the worker acquired by the biometric information acquisition unit 362 sent from the wearable device 3, and the reception intensity and position information identifier of each access point 2 acquired by the reception intensity acquisition unit 363. Is stored in association with the system time of the clock means 42 at the time of reception. Since it can be considered that data is sent from the wearable device 3 to the server 4 without delay, the system time when the data is stored in the storage unit 43 can be regarded as the time when various data is acquired by the wearable device 3. .. If the data transmission/reception delay is large, the delay may be corrected accordingly.

The position calculation means 44 calculates the position of the worker wearing the wearable device 3 in the indoor space S. The position calculation means 44 calculates an estimated distance from each access point 2 to the wearable device 3 from the reception intensity of each access point 2 stored in the storage means 43. This estimated distance can be calculated by the Friis transmission formula of the following equation (1).
Pr/Pt=GtGr(λ/4πd) ² ... Formula (1)
Here, Pr is the reception power (reception intensity), Pt is the transmission power (output intensity), Gt is the gain of the transmission antenna, Gr is the gain of the reception antenna, λ is the wavelength of the radio wave, and d is the estimated distance. Gt and Gr are known values unique to each device. The wavelength and output intensity of the radio wave transmitted by the BLE communication unit 22 are used for λ and Pt, respectively, and the reception intensity stored in the storage unit 43 is used for Pr. By substituting these values into the equation (1), the estimated distance of d can be calculated. The position calculation means 44 stores the estimated distance calculated in this way in the storage means 43 in association with the reception intensity stored in the storage means 43 used for calculating the estimated distance.

Next, the position calculation means 44 calculates the position of the wearable device 3 based on the estimated distances of the plurality of access points 2 stored in the storage means 43 and associated with the same system time. A position information identifier is associated with the estimated distance, and the position information at which the access point 2 having the position information identifier is installed is known from the position information identifier. The position of the intersection of a circle having the estimated distance centered at the position indicated by as a radius can be calculated as the position of the wearable device 3 at the system time. At this time, if there are three or more circles, the intersection can be determined as one point, so it is preferable that at least three or more access points 2 are installed. The calculated position information is stored in the storage unit 43 in association with the system time. In this way, the position calculation means 44 acquires and stores the position information of the worker.

The wireless LAN communication unit 45 transmits and receives radio waves conforming to the wireless LAN wireless communication standard, and the server 4 communicates with another device conforming to the same wireless LAN standard via the wireless LAN communication unit 45. Is configured so that various data can be wirelessly communicated. At least one access point 2 is provided with a wireless LAN communication unit 23, and the server 4 can transmit and receive various data to and from at least one access point 2 via the wireless LAN communication unit 45. Has become.

An example of a series of operations for acquiring and accumulating biometric information and position information of a worker who works in the indoor space S by the indoor space work support system 1 configured as described above will be described below.

A plurality of access points 2 are installed at predetermined positions in the indoor space S, and each access point 2 can communicate with at least one other access point 2 by the BLE communication means 22. At least one of the points 2 is communicatively connected to the wireless LAN communication means 45 of the server 4 by the wireless LAN communication means 23. Each access point 2 has a position information identifier indicating the position information of the installed position, and transmits a radio wave carrying the position information identifier from the BLE communication means 22 with a constant output intensity. The wearable device 3 is attached to the worker who works in such an indoor space S, and the reception intensity acquisition unit 363 of the main device 36 included in the wearable device 3 causes the BLE communication unit 22 of each access point 2 to operate. Acquires the reception strength and position information identifier of the transmitted radio wave. The data of the reception intensity and the position information identifier acquired by the reception intensity acquisition unit 363 are transmitted to the access point 2 having the highest reception intensity at that time via the BLE communication unit 365 of the main device 36. The access point 2 that receives the data from the wearable device 3 transmits the data to the access point 2 communicatively connected to the server 4 by passing through some access points 2 on the way. The data is sent from the access point 2 communicatively connected to the server 4 to the server 4, and is stored in the storage unit 43 in association with the system time measured by the clock unit 42. The wearable device 3 sequentially transmits the reception intensity and position information identifier data to the server 4 each time the reception intensity acquisition unit 363 acquires the reception intensity and position information identifier data, and causes the storage unit 43 to store the data. As for the frequency with which the reception intensity acquisition unit 363 acquires the reception intensity and the position information identifier, if the interval is too short, the communication amount and the data capacity increase, and if the interval is too long, the interval of the worker position information obtained is also large. Therefore, it may be set as appropriate according to the expected moving speed of the worker. The position calculation means 44 of the server 4 receives the radio wave reception intensity and the position information identifier of each access point 2 stored in the storage means 43 in association with the same system time, and the output intensity of the radio wave transmitted by the access point 2. Based on the above, the estimated distance from each access point 2 to the wearable device 3 at that system time is calculated, and from the intersection of the circles whose radius is the estimated distance centered on the position of each access point 2, the wearable device 3 The position is calculated, and the position information and the system time are associated and stored in the storage unit 43. In this way, the indoor space work support system 1 can acquire and store the position information of the worker.

The wearable device 3 also acquires biometric information of the worker who is worn by the biometric information acquisition unit 362 of the main device 36. The biological information acquisition means 362 uses the heartbeat sensor 3621 to obtain heartbeat information from the electric signals of the two electrodes 32 that contact the body of the worker, the temperature sensor 3622 to obtain the body surface temperature information of the worker, and the acceleration sensor 3623 to detect the worker's body surface temperature. The posture information is acquired at a constant frequency. The biometric information acquired by the biometric information acquisition unit 362 is accessed from the BLE communication unit 365 of the main device 36 each time the biometric information is acquired, like the reception intensity and position information identifier acquired by the reception intensity acquisition unit 363. It is transmitted to the server 4 via the point 2 and stored in the storage means 43 in association with the system time of the clock means 42. In this way, the indoor space work support system 1 can acquire and store the biometric information of the worker.

If the main device 36 of the wearable device 3 cannot transmit/receive data to/from the access point 2 because the worker goes out of the wireless communication range of the access point 2 or the like, The control unit 361 notifies the auxiliary control unit 371 of the auxiliary device 37 that is wirelessly communicable with the main device 36 that the wireless communication is disabled, and assists the biometric information acquired by the biometric information acquisition unit 362. Send to device 37. To determine whether or not wireless communication between the main device 36 and the access point 2 is possible, for example, the control unit 361 of the main device 36 sets a reference value for the reception intensity acquired by the reception intensity acquisition unit 363, and If it is below the reference value, wireless communication is not possible, and if it is above the reference value, wireless communication is possible. The auxiliary control unit 371 of the auxiliary device 37 stores the received biometric information in the auxiliary storage unit 373 in association with the internal time of the auxiliary clock unit 372. When the worker returns to the wireless communication range of the access point 2 and the wireless communication between the wearable device 3 and the access point 2 is restored and data transmission/reception becomes possible, the control unit 361 of the main device 36 operates as usual. The biometric information acquired by the information acquisition unit 362 is returned so as to be transmitted to the server 4 via the access point 2, and the auxiliary control unit 371 of the auxiliary device 37 is notified that the wireless communication has been restored. When the recovery of wireless communication is notified, the auxiliary control unit 371 acquires the system time from the clock unit 42 of the server 4, calculates the difference from the internal time of the auxiliary clock unit 372, and based on the difference, the auxiliary control unit 371. The internal time at the time of acquisition of the biometric information associated with the biometric information stored in the storage unit 373 is corrected to the same system time, and the biometric information associated with the corrected system time is transmitted to the server 4. Then, it is stored in the storage means 43. As described above, according to the indoor space work support system 1, even when the worker wearing the wearable device 3 goes out of the communication range of the access point 2, the biometric information of the worker while it goes out of the communication range. Can be acquired and accumulated seamlessly.

As described above, according to the indoor space work support system 1 according to the present embodiment, it is possible to acquire and store biometric information and position information of a worker who works in an indoor space S where GPS does not reach. From these data, it is possible to analyze the flow line pattern of the worker, the biometric information pattern such as heartbeat, etc., and use the analysis results to improve the efficiency of the worker's actions, avoid danger, and feel unwell. It is possible to improve productivity and safety of workers in indoor spaces such as prevention.

The above is merely an exemplification of one embodiment of the present invention, and therefore, the scope of the present invention is not limited to the above embodiment and can be appropriately changed without departing from the spirit of the present invention. is there.

DESCRIPTION OF SYMBOLS 1 Indoor space work support system 2 Access point 22 BLE communication means 23 Wireless LAN communication means 3 Wearable device 31 Wear 32 Electrode 33 Wiring 36 Main device 362 Biological information acquisition means 3621 Heartbeat sensor 363 Reception intensity acquisition means 365 BLE communication means 37 Auxiliary device 371 Auxiliary control means 372 Auxiliary clock means 373 Auxiliary storage means 374 BLE communication means 4 Server 42 Clock means 43 Storage means 44 Position calculation means 45 Wireless LAN communication means S Indoor space

Claims (5)

At least three or more access points installed in a predetermined position in the indoor space so as to be capable of wireless communication with each other;
A wearable device worn by a worker who works in the indoor space and capable of wireless communication with each of the access points,
A server communicatively connected to at least one said access point,
A system comprising
Each of the access points includes a position information identifier indicating the position information of the position where each is installed, and transmits a radio wave carrying the position information identifier at a constant output intensity,
The wearable device is
Biometric information acquisition means for acquiring biometric information of the worker,
Reception intensity acquisition means for acquiring the reception intensity of the radio wave transmitted from the access point and the position information identifier,
Equipped with
The wearable device, via the access point, the biometric information acquired by the biometric information acquisition unit, the reception intensity and the position information identifier for each access point acquired by the reception intensity acquisition unit, Send to the server,
The server is
Clock means to hold the system time and keep time,
Storage means for storing the biometric information sent from the wearable device, the reception intensity and the position information identifier for each of the access points in association with the system time by the clock means,
An estimated distance from each access point is calculated based on the reception intensity and the output intensity associated with the same system time stored in the storage unit, and the position information identifier and the estimation for each access point are calculated. Position calculating means for calculating the position of the wearable device based on the distance,
An indoor space work support system comprising: The indoor space work support system according to claim 1, wherein the wearable device is clothes-type smart wear worn on the upper half of the worker. The indoor space work support system according to claim 1, wherein the biological information includes at least heartbeat information. The indoor space according to any one of claims 1 to 3, wherein the access point and the wearable device perform wireless communication according to a wireless communication standard based on Bluetooth Low Energy (Bluetooth: registered trademark). Work support system. The wearable device further comprises an auxiliary device,
The auxiliary device is
Auxiliary control means,
Auxiliary clock means that holds the internal time and measures time,
Auxiliary storage means for storing the biological information acquired by the biological information acquisition means in association with the internal time by the auxiliary clock means,
Equipped with
When the wireless communication between the wearable device and the access point is disconnected, the auxiliary control unit stores the biometric information in the auxiliary storage unit in association with the internal time, and the wearable device and the access point. When the wireless communication of the server is restored, the difference between the system time of the clock means of the server and the internal time of the auxiliary clock means is calculated, and based on the difference, the auxiliary storage means stores the difference during the disconnection. The internal time at the time of acquisition of the biometric information linked to the stored biometric information is corrected to the system time of the same time, and the biometric information linked to the corrected system time is stored in the server. The indoor space work support system according to any one of claims 1 to 4, wherein the system is transmitted and stored in the storage means.

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