JP2005348011A - Drowning accident prevention system, sensor network device, drowning accident preventing method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To notify a monitoring center of the current position of a person swimming in the ocean even when transmission power of the center network device is made small in a drowning accident prevention system in which the person who swims in the ocean wears radio equipment (sensor network device) so as to notify the monitoring center of the current position of the person swimming in the ocean. <P>SOLUTION: Sensor network devices 1A to 1F are attached to caps 2A to 2F worn by respective persons A to F swimming in the ocean. The respective sensor network devices 1A to 1F detect the current position of an own device in each prescribed time and transmit the detected current position to a management terminal 3. However, when the current position can not be directly transmitted to the management terminal 3, the current position is transmitted to the management terminal 3 through another sensor network device 1C near the own sensor network device 1A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water accident prevention technique for preventing a water accident at a beach or a river, and more particularly, to a water accident prevention technique for preventing a water accident by constantly notifying a monitoring center or the like of the current position of a beach user by radio. .

  Summer is a fun beach, but there is no year without drowning news. There are many painful accidents around the world, such as accidents involving children whose parents have taken their eyes off, accidents that caused them to go offshore against the tide. In order to prevent such a water accident, a supervisor is assigned at a beach. If a large number of supervisors with excellent skills are arranged, it becomes possible to keep the rate of drowning accidents to a very low level, but this is difficult both in terms of cost and personnel.

  By the way, in the field of water rescue, conventionally, a user is equipped with a wireless device, and the current position of the user is wirelessly notified to a monitoring center or the like (for example, Patent Documents 1 and 2). reference).

  Patent Literature 1 discloses a water rescue device that outputs a distress signal including the current position when the water falls. By attaching such a water rescue device to an angler or the like, it is possible to quickly perform a rescue operation when an underwater fall accident occurs.

Patent Document 2 discloses a life-saving system that includes a portable transmitter worn by a passenger and a transceiver mounted on a ship. When a passenger falls, the portable transmitter transmits a water detection signal to the transceiver installed on the ship, and when the transceiver receives the water detection signal, the position of the waterfall and the current time are communicated in advance. Send it first or stop the engine. In Patent Document 2, the portable transmitter is suspended from the neck, but a method of attaching the portable wireless device to the cap is also known (see, for example, Patent Document 3).
JP 09-095298 A JP 2002-232303 A JP 2001-251404 A

  The techniques described in Patent Documents 1 and 2 described above are techniques for saving a fallen person from a ship, but it is conceivable to apply them to prevent a water accident at a beach. That is, a portable wireless device that transmits the current position is attached to a hat or the like worn by a beach bather, and the current position is constantly transmitted to a monitoring center or the like installed on the beach. In the monitoring center, the position of the bather is confirmed based on the current position sent from each portable wireless device, and if the bather in the dangerous water area is confirmed, the rescue operation is immediately performed. If such monitoring using a portable radio device and monitoring by a supervisor are used in combination, it is possible to extremely reduce the risk of a water accident.

  As described above, by using a portable wireless device, it is possible to make the accident rate of drought accidents extremely low, but the problem here is the power source of the portable wireless device. In other words, if the transmission power for transmitting the current position is increased, the current position of the bather can be notified even when the distance between the bather and the monitoring center is long. However, when the transmission power is increased, the power source size is increased, which causes a problem that the user feels uncomfortable at the time of wearing. On the other hand, if the transmission power at the current position is reduced, the power supply size can be reduced, so it is difficult for the user to feel uncomfortable, but if the distance between the beach visitor and the monitoring center is increased, The customer's current location cannot be notified.

  Accordingly, an object of the present invention is to monitor the current position of the user without increasing the transmission power of the portable wireless device (sensor network device) even when the user is away from the monitoring center. The purpose is to enable transmission to a management terminal installed in a center or the like.

The first water accident prevention system according to the present invention can transmit the current position of the user to a management terminal installed in a monitoring center or the like without increasing the transmission power of the sensor network device worn by the user. To
In a water accident prevention system that includes a sensor network machine that each user wears and a management terminal,
Each sensor network machine is
When the current position of the device itself cannot be transmitted directly to the management terminal, the current position is transmitted to the management terminal via another sensor network device that can communicate with the management terminal.
The management terminal is
Based on the received current position of the sensor network device, it is characterized by determining whether or not the user wearing the sensor network device is in a dangerous water area.

The second water accident prevention system according to the present invention achieves the same object as the first water accident prevention system,
In a water accident prevention system that includes a sensor network machine that each user wears and a management terminal,
Each sensor network machine is
When the current position of the own device cannot be directly transmitted to the management terminal, the current position is set to the sensor network device having the smallest number of hops to the management terminal among other sensor network devices that can communicate with the own device. It has a configuration to transmit, and when the current location is sent from another sensor network machine, has a configuration to relay the current location to the next hop,
The management terminal is
Based on the received current position of the sensor network device, the user wearing the sensor network device determines whether or not the user is in a dangerous water area.

Even if the third water accident prevention system according to the present invention is not able to communicate with other sensor network devices, in order to be able to transmit the current position to the management terminal,
A fixed repeater fixed at a predetermined position for relaying the received current position to the management terminal; and
Each sensor network machine is
When the current position of the own device cannot be directly transmitted to the management terminal, the present position is transmitted to the fixed repeater as long as communication with the fixed repeater is possible.

In order to enable the fourth water disaster prevention system according to the present invention to transmit the current position of the user to the management terminal without increasing the transmission power of the sensor network device worn by the user,
In the second water accident prevention system,
Each sensor network machine is
Position detecting means for detecting the current position of the own device;
If the current position detected by the position detecting means cannot be transmitted directly to the management terminal, the sensor network machine having the smallest number of hops with the management terminal among other sensor network machines capable of communicating with the own device. Current position notifying means for transmitting the current position to,
Relay means for relaying the current position sent from another sensor network machine to the next hop,
The management terminal is
It is characterized by comprising determination means for determining whether or not a user wearing the sensor network device is in a dangerous water area based on the received current position of the sensor network device.

In order to enable the fifth water accident prevention system of the present invention to transmit the current position of the user to the management terminal more reliably, in the fourth water accident prevention system,
Each sensor network machine is
When there is no sensor network device that can communicate with its own device, it is provided with power supply control means for increasing transmission power when transmitting the current position.

In order to enable a sixth water accident prevention system according to the present invention to issue a warning to a user in a dangerous water area, in the fourth water accident prevention system,
The management terminal is
The determination means comprises an alarm transmission means for transmitting an alarm signal to the sensor network device of the user who is determined to be in a dangerous water area,
Each sensor network machine is
When an alarm signal addressed to the own device is sent from the management terminal, an alarm means for issuing an alarm to a user wearing the own device is provided.

In order to allow the user to determine whether or not the user is in a dangerous water area in consideration of the tide, the fourth water accident prevention system according to the present invention is as follows.
The determination means has a configuration for changing a dangerous water area based on tide level data indicating tide fullness.

In the fourth water accident prevention system, the eighth water accident prevention system according to the present invention can set an appropriate dangerous water area for each user.
The determination means is
It has the structure which determines whether the said user exists in the dangerous water area according to the water depth declared by the user.

A ninth water disaster prevention system according to the present invention is the fourth water accident prevention system in order to notify the current position of the user (for example, a child) to a portable terminal carried by a parent or the like. ,
A portable notification means is provided for notifying the mobile terminal declared by the user of the current location of the user.

The tenth water accident prevention system according to the present invention is the first to ninth water accident prevention systems,
The sensor network device is fixed to a hat worn by the user.

The sensor network device according to the present invention can transmit the current position of the user to the management terminal without increasing the transmission power of the sensor network device worn by the user.
A sensor network machine installed on a user,
When the current position of the own device cannot be directly transmitted to the management terminal, the current position is set to the sensor network device having the smallest number of hops to the management terminal among other sensor network devices that can communicate with the own device. It has a configuration for transmitting, and when the current location is sent from another sensor network device, it has a configuration for relaying the current location to the next hop.

The water accident prevention method according to the present invention enables the user's current location to be transmitted to the management terminal without increasing the transmission power of the sensor network device worn by the user.
If the specific sensor network device attached to the user cannot directly transmit the current position of the own device to the management terminal, the hop between the sensor network device capable of communicating with the own device and the management terminal Send the current position to the smallest sensor network machine,
The sensor network machine from which the current position is sent from another sensor network machine transmits the current position to the next hop,
The management terminal determines whether or not the user is in a dangerous water area based on the received current position of the specific sensor network device.

The program according to the present invention enables the user's current location to be transmitted to the management terminal without increasing the transmission power of the sensor network device worn by the user.
A program for causing a computer having a position detection means for detecting a current position to function as a sensor network machine,
The computer,
When the current position detected by the position detection means cannot be transmitted directly to the management terminal, among other sensor network machines that can communicate with the own device, for the sensor network machine with the smallest number of hops to the management terminal Current position notification means for transmitting the current position,
It is characterized by functioning as a relay means for relaying the current position sent from another sensor network machine to the next hop.

  According to the first, second, and fourth water accident prevention systems, sensor network devices, water accident prevention methods, and programs according to the present invention, use without increasing the transmission power of the sensor network device worn by the user. It is possible to transmit the current position of the person to the management terminal. This is because the current position is transmitted to the management terminal via another sensor network device.

  According to the third water accident prevention system according to the present invention, the current position can be transmitted to the management terminal even when communication with other sensor network devices is not possible. The reason is that a fixed repeater fixed at a predetermined position for relaying the received current position to the management terminal is provided.

  According to the fifth water accident prevention system according to the present invention, the current position of the user can be more reliably transmitted to the management terminal. The reason is that when there is no communicable sensor network device, power supply control means for increasing the transmission power when transmitting the current position is provided.

  According to the sixth water disaster prevention system according to the present invention, it is possible to issue a warning to a user in a dangerous water area. The reason is that the management terminal includes an alarm transmission means for transmitting an alarm signal to the sensor network device of the user in the dangerous water area.

  According to the seventh water accident prevention system according to the present invention, it is possible to determine whether or not the user is in a dangerous water area in consideration of tides. The reason is that the determination means has a configuration that changes the dangerous water area based on tide level data indicating tide fullness.

  According to the eighth water accident prevention system according to the present invention, an appropriate dangerous water area can be set for each user. The reason is that the determination means determines whether or not there is a user in the dangerous water area according to the water depth reported by the user.

  According to the ninth water accident prevention system according to the present invention, the current position of a user (for example, a child) can be notified to a portable terminal carried by parents or the like. The reason is that the mobile terminal is provided with mobile notification means for notifying the mobile terminal reported by the user of the current location of the user.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration example of a first embodiment of a water accident prevention system according to the present invention. Referring to the figure, the water accident prevention system according to the present embodiment includes the sensor network machines 1A to 1F attached to the hats 2A to 2F of the bathers A to F and the coast monitoring operated by the service provider. It is comprised from the management terminal 3 installed in the center (not shown) etc. In the following description, addresses “AddA to AddF” and device names “IdA to IdF” are assigned to the sensor network devices 1A to 1F, respectively, and the address “Add0” and the device name “Id0” are assigned to the management terminal 3. "Is given. In this embodiment, the sensor network machine is attached to the hat, but it may be attached to a belt or suspended from the neck.

  Each of the sensor network devices 1A to 1F has a function of detecting the current position of its own device and notifying the management center 3 of the detected current position. However, when the current position cannot be transmitted directly to the management center 3, it has a function of transmitting the current position to the management terminal 3 via another sensor network device. Furthermore, each sensor network machine 1A-1F has a function etc. which issue a warning to the bathers A-F, when the warning signal addressed to its own device is received from the management terminal 3.

  FIG. 2 shows a configuration example of the sensor network machine 1A. The other sensor network machines have the same configuration.

  As shown in FIG. 2, the sensor network machine 1A includes an antenna unit 10A, a transmission / reception unit 11A, a GPS (Global Positioning System) unit 12A, a control unit 13A, a route information storage unit 14A, an alarm unit 15A, a power source 16A.

  The antenna unit 10A includes an antenna for use in communication with the sensor network device and the management terminal 3, and an antenna for receiving a signal from a GPS satellite.

  The transmission / reception unit 11A has a function of exchanging data with the sensor network machine and the management terminal 3 via the antenna unit 10A.

  The GPS unit 12A has a function of detecting the current position of the sensor network device 1A based on a signal transmitted from a GPS satellite.

  In the route information storage unit 14A, the destination address when transmitting the current position of the own device and the number of hops from the own device to the management terminal 3 are registered. FIG. 3 shows an example of the contents of the route information storage unit 14A. In this example, the destination address is the address “AddC” of the sensor network device 1C, and the hop count is “2”.

  The alarm unit 15A is realized by a speaker, a vibrator, or the like, and outputs an alarm message or vibrates according to the control of the alarm unit 134A.

  The power supply unit 16A is realized by a storage battery, a solar cell, a fuel cell, or a combination thereof, and supplies operating power to each unit of the sensor network machine 1A.

  The control unit 13A includes route information management means 131A, current position notification means 132A, relay means 133A, alarm means 134A, and power supply control means 135A.

  The route information management unit 131A has the following functions.

-An inquiry message is transmitted every time the route information update timing comes.
If a response message from the management terminal 3 (a response message including the transmission source address “Add0” and the hop number “0”) exists in the response message to the inquiry message, it is stored in the path information storage unit 14A. The address “Add0” of the management terminal 3 is stored as the destination address, and the hop number “1” obtained by adding “1” to the hop number in the response message is stored as the hop number.
If there is no response message from the management terminal 3 in the response message to the inquiry message, the response message including the smallest hop number is selected, and the route information is stored with the source address of the selected response message as the destination address The number of hops obtained by adding “1” to the number of hops is stored in the path information storage unit 14A.
If no response message for the inquiry message has been received, the power supply control means 135A is instructed to increase the transmission power level by one level, and then the inquiry message is transmitted again.
When an inquiry message from another sensor network device is received, a response message including the number of hops stored in the path information storage unit 14A and the transmission source address as the address “AddA” of the own device is used as the inquiry source. return.

  The current position notification unit 132A has a function of transmitting a current position notification including the current position detected using the GPS unit 12A to the destination address registered in the route information storage unit 14A every time the position transmission timing comes. Have.

  The relay unit 133A has a function of transmitting the current position to a destination address registered in the path information storage unit 14A when the current position is sent from another sensor network device.

  The alarm unit 134A has a function of operating the alarm unit 15A when an alarm signal is received.

  The power control unit 135A has a function of controlling the transmission power level.

  The control unit 13A is realized by, for example, a CPU (computer). When realized by a computer, the control unit 13A is as follows. A disk, a semiconductor memory, and other recording media recording a program for causing the computer to function as the control unit 13A are prepared, and the computer reads the program. The computer realizes path information management means 131A, current position notification means 132A, relay means 133A, alarm means 134A, and power supply control means 135A on its own computer by controlling its own operation according to the read program.

  Although the configuration of the sensor network machine 1A has been described above, other sensor network machines have the same configuration. In the following description, when components of the other sensor network devices 1B to 1F are represented, for example, the antenna units 10B to 10F are denoted by B to F instead of A.

  The management terminal 3 is arranged at a monitoring center (not shown) installed on the coast, for example, and is currently sent from the sensor network machines 1A to 1F attached to each of the bathers A to F. A function to display the current location of each beach visitor A to F on the map based on the location, a function to determine whether each beach visitor A to F is in a dangerous water area, or a beach bather in the dangerous water area A function of transmitting an alarm signal to the sensor network device.

  FIG. 4 is a block diagram illustrating a configuration example of the management terminal 3, and includes an antenna unit 31, a first transmission / reception unit 32, a second transmission / reception unit 33, a control unit 34, a storage device 35, a keyboard, and the like. An input unit 36 and a display unit 37 such as an LCD are provided.

  The antenna unit 31 includes an antenna for communicating with the sensor network device and an antenna for transmitting mail to a mobile device such as a mobile phone designated by the user.

  The first transmission / reception unit 32 has a function of exchanging data with the sensor network device. The second transmission / reception unit 33 has a function of transmitting mail to a mobile device designated by the user.

  The storage device 35 is provided with a sensor network device management information storage unit 351, a map data storage unit 352, and a tide level data storage unit 353.

  The sensor network machine management information storage unit 351 indicates the current position of the sensor network machine and whether it is rented or not in association with the device name and address of each sensor network machine targeted for rental in the monitoring center. A rental flag ("1" = rented), a warning flag indicating whether the user wearing the sensor network device is in a dangerous water area ("1" = assumed to be in a dangerous water area), User information is registered. In this embodiment, as the user information, the e-mail address declared by the user and the water depth are registered, but other information may be registered.

  FIG. 5 is a diagram showing an example of the contents of the sensor network device management information storage unit 351. In the example of the figure, for example, in the second entry # 2, the sensor network machine 1B having the device name IdB and the address AddB is currently being rented, and the bather B who rented this sensor network machine 1B is currently in danger. It is in a water area, and its position is latitude XB and longitude YB. For example, the seventh entry # 7 indicates that the sensor network device 1G having the device name IdG and the address AddG is not currently rented.

  In the map data storage unit 352, map data for displaying a coast and a sea area to be monitored are recorded. The map data also includes the water depth at each point at the reference tide level.

  In the tide level data storage unit 353, the difference between the reference tide level and the tide level at each time is recorded.

  The control unit 34 includes response means 341, current position management means 342, determination means 343, alarm transmission means 344, display control means 345, user information registration means 346, and mail transmission means 347. Yes.

  The response means 341 has a function of transmitting a response message to the inquiring sensor network device when receiving an inquiry message from the sensor network device. The response message transmitted by the response unit 341 includes the hop number “0”.

  The current position management unit 342 has a function of managing the current position of each sensor network machine being rented. Specifically, when the current position is sent from the sensor network machine, the sent current position is registered in the entry corresponding to the sensor network machine in the sensor network machine management information storage unit 351.

  The determination means 343 has a function of determining whether or not each of the bathers renting the sensor network machine is in a dangerous water area.

  The alarm transmission unit 344 has a function of transmitting an alarm signal to a sensor network machine that is rented to a beach bather who is determined to be in a dangerous water area by the determination unit 343.

  The display control means 345 displays a map of the monitoring target area on the display unit 37 according to the map data stored in the map data storage unit 352, and each sensor network machine stored in the sensor network machine management information storage unit 351. The function of displaying the position of each sea bath on the map based on the current position of the seawater.

  The user information registration means 346 has a function of registering user information input from the input unit 36 in a corresponding entry of the sensor network device management information storage unit 351.

  The e-mail transmission unit 347 has a function of transmitting a map indicating the current position of the user to the e-mail address specified by the user information of the bather who is determined to be in the dangerous water area by the determination unit 343.

  The control unit 34 can be realized by a computer, and when realized by a computer, for example, is as follows. A disk, a semiconductor memory, and other recording media recording a program for causing the computer to function as the control unit 34 are prepared, and the computer is caused to read the program. The computer controls its own operation according to the read program, so that the response unit 341, the current position management unit 342, the determination unit 343, the alarm transmission unit 344, the display control unit 345, the user information registration unit are provided on the computer. 346, the mail transmission means 347 is realized.

[Description of Operation of Embodiment]
Next, the operation of the present embodiment will be described in detail.

  When using a water accident prevention service using the water accident prevention system of the present invention, a user (such as a parent who led a child) goes to a monitoring center operated by a service provider and applies for the use of the service. The service provider gives the user a hat to which the sensor network device is attached in exchange for the price, and the user wears the hat on his / her child, for example. In addition, the user instructs the service provider about the depth of the dangerous water area and the e-mail address to be contacted when the child enters the dangerous water area. Thereafter, the service provider inputs the device name (for example, IdA) of the sensor network machine rented to the user from the input unit 36, the water depth and the mail address instructed by the user. As a result, the user information registering unit 346 sets the rental flag of the first entry # 1 (entry corresponding to the device name IdA) in the sensor network management information storage unit 351 to “1”, and instructs the user The water depth and mail address (user information) are stored in the first entry # 1. Through the above procedure, the user can use the water accident prevention service using the water accident prevention system of the present invention. When the sensor network device is returned, the service provider changes the rental flag in the entry corresponding to the returned sensor network device to “0”.

  Now, for example, it is assumed that the beach bathers A to F shown in FIG. 1 perform the above-described procedure, wear the hats 2A to 2F to which the sensor network machines 1A to 1F are attached, and enjoy the beach.

  Since each of the sensor network devices 1A to 1F keeps the transmission power low, there are cases where the current position cannot be transmitted directly to the management terminal 3. In such a case, in order to be able to transmit the current position to the management terminal 3 via another sensor network machine, each sensor network machine 1A to 1F has a diagram every predetermined time (each time the route information is updated). 6 is performed, and the destination address and the number of hops stored in the route information storage units 14A to 14F are updated.

  Now, for example, if the sensor network device 1A has reached the route information update timing, the route information management means 131A in the sensor network device 1A transmits an inquiry message via the transmission / reception unit 11A and the antenna unit 10A (step S61). . The transmission power level at this time is the first level (the level with the lowest transmission power). Further, the inquiry message includes the address AddA of the sensor network device 1A as a transmission source address, and also includes a transmission power level. Thereafter, the path information management unit 131A performs a response message reception process for a predetermined time (step S62). Specifically, when a response message addressed to the own apparatus is received via the antenna unit 10A and the transmission / reception unit 11A during the predetermined time, a process of holding the response message is performed.

  On the other hand, the route information management means 131B to 131F in the other sensor network devices 1B to 1F perform the process shown in the flowchart of FIG. 7 when receiving the inquiry message from the sensor network device 1A. Now, for example, if the sensor network devices 1B and 1C have received an inquiry message from the sensor network device 1A, the route information management means 131B and 131C first count the number of hops stored in the route information storage units 14B and 14C. Is input (step S71). At this time, it is assumed that the hop counts stored in the path information storage units 14B and 14C are “1” and “2”, respectively. Thereafter, the route information management means 131B and 131C transmit response messages including the hop numbers “1” and “2” and the transmission source addresses “AddB and AddC” to the inquiry source sensor network device 1A ( Step S72). When transmitting the response message, the route information management means 131B and 131C control the power supply control means 135B and 135C to set the transmission power level to the transmission power level included in the inquiry message.

  Also, when the response means 341 in the management terminal 3 receives the inquiry message from the sensor network machine 1A, the response means 341 includes a response message including the number of hops “0” and the transmission source address “Add0”. It is assumed that the inquiry message transmitted from the sensor network machine 1A this time cannot be received.

  When the response message reception process in step S62 is completed, the route information management unit 131A checks whether the response message has been received (step S63 in FIG. 6). In this example, since the response messages from the sensor network devices 1B and 1C are received, the determination result in step S63 is YES.

  Thereafter, the route information management means 131A checks whether or not the received response message includes a response message from the management terminal 3 (step S64). In the case of this example, since the response message from the management terminal 3 has not been received, the determination result of step S64 is NO, and the process of step S66 is performed. In step S66, a response message with the smallest number of hops included in the received response message is selected, and the transmission source address of the selected response message is stored in the path information storage unit 14A as a destination address. Then, the number of hops obtained by adding “1” to the number of hops in the response message is stored in the route information storage unit 14A (step S66). In step S66, a process of notifying the current position notification means 132A of the transmission power level when the latest inquiry message is transmitted is also performed. In this example, the hop counts in the response messages sent from the sensor network devices 1B and 1C are “1” and “2”, respectively, so the route information management means 131A sets the address AddB of the sensor network device 1B. While storing the destination address in the path information storage unit 14A, the hop number “2” obtained by adding “1” to the hop number “1” in the response message is registered in the path information storage unit 14A.

  If it is determined in step S64 that the response message from the management terminal 3 is present in the received response message, the address Add0 of the management terminal 3 is stored in the path information storage unit 14A as the destination address, and The hop number “1” obtained by adding “1” to the hop number “0” in the response message is stored in the route information storage unit 14A (step S65). In step S65, the current position notification unit 132A is also notified of the transmission power level when the latest inquiry message is transmitted.

  If no response message is received in step S63, the power supply control means 135A is controlled to increase the transmission power level by one level (step S67), and the inquiry message transmission process is performed again (step S67). Step S61). When the transmission power is set to the maximum level, the maximum level is determined so that the sensor network device 1A can directly communicate with the management terminal 3 even when the sensor network device 1A exists in the dangerous water area.

  Further, the current position notification means 132A in the sensor network machine 1A executes the flowchart of FIG. 8 at regular time intervals (every time the position transmission timing is reached), and transmits the current position of its own device to the management terminal 3. .

  The current position notification means 132A in the sensor network device 1A obtains the current position from the GPS unit 12A and the destination address (address AddC) from the route information storage unit 14A at the position transmission timing (step S81). , S82). Next, the current position notification unit 132 controls the power supply control unit 135A to set the transmission power level to the latest transmission power level notified from the path information management unit 131A, and then transmits the current position notification (step S83). . This current position notification includes the current position (latitude XA, longitude YA) acquired in step S81 and the device name IdA of the sensor network device 1A. The destination address is the address AddC (address of the sensor network device 1C) acquired in step S82.

  When the current location notification means 132A in the sensor network device 1C receives the current location notification from the sensor network device 1A whose destination address is “AddC”, as shown in the flowchart of FIG. 9, the route information storage unit 14C Is input (address Add0; address of the management terminal 3) (step S91). Thereafter, the current position notification is transmitted to the address Add (management terminal 3) at the latest transmission power level notified from the route information management means 131C (step S92).

  When receiving the current location notification including the device name IdA and the current location (XA, YA), the current location management means 342 in the management terminal 3 receives the device name IdA from the current location notification as shown in the flowchart of FIG. The current position (XA, YA) is extracted. Thereafter, the current position (XA, YA) is stored in the entry corresponding to the device name IdA among the entries in the sensor network management information storage unit 351 (steps S101 and S102).

  The determination means 343 in the management terminal 3 determines whether or not each of the bathers A to F renting out the sensor network devices 1A to 1F is in a dangerous water area by performing the processing shown in the flowchart of FIG.

  The determination unit 343 pays attention to one of the entries in the sensor network device management information storage unit 351, and checks whether the rental flag in the entry is “1”, that is, whether the rental is in progress. (Steps S111 and S112).

  When the rental flag is “0” (NO in step S112), attention is paid to the next entry (step S111). On the other hand, when the rental flag is “1” (YES in step S112), the water depth at the current position stored in the entry of interest is obtained (step S113). That is, the difference between the reference tide level and the actual tide level at the current time stored in the tide level data storage unit 353 is added to the water depth at the reference tide level of the current position stored in the map data storage unit 352. Thus, the water depth at the current time of the current position is obtained.

  Thereafter, the determination unit 343 compares the water depth obtained in step S113 with the water depth (user information) stored in the entry of interest, thereby bathing in the sea bath equipped with the sensor network device corresponding to the entry of interest. It is determined whether the customer is in a dangerous water area (step S114). If the water depth is not registered in the entry of interest, a comparison is made between the fixed value (for example, water depth of 1.5 m) and the water depth obtained in step S113 to determine whether or not the corresponding bather is in a dangerous water area. judge.

  If it is determined that the water is not in the dangerous water area (NO in step S114), the alarm flag in the entry of interest is set to “0” (step S115), and the next entry is noted (step S111).

  On the other hand, if it is determined that the vehicle is in the dangerous water area (YES in step S114), the alarm flag in the entry of interest is changed to “1” (step S116), and then the sensor network device stored in the entry of interest is stored. Is sent to the alarm transmission means 344, and the mail address stored in the entry of interest is passed to the mail transmission means 347 (steps S117 and S118). Thereafter, the determination unit 343 pays attention to the next entry (step S111). In addition, when step S114 becomes YES, you may make it output the voice message to the effect that there is a sea bath in a dangerous water area from the speaker which abbreviate | omitted illustration. Furthermore, the police and the rescue team may be notified of the current location of the bather in the dangerous water area and requested to be dispatched.

  When the address of the sensor network device is passed, the alarm transmission unit 344 transmits an alarm signal having the address as a destination address via the first transmission / reception unit 32 and the antenna unit 31. The alarm means 134A to 134F in the sensor network machines 1A to 1F control the alarm units 15A to 15F when the alarm signals with the addresses AddA to AddF of their own devices as destination addresses are received, Raise an alarm. For example, when the alarm units 15A to 15F are configured by speakers, a voice message such as “do not go further in that direction” is output. In the present embodiment, the alarm signal is directly transmitted from the management terminal 3 to the sensor network machine installed by the bather in the dangerous water area. However, the alarm signal is transmitted via another sensor network machine. May be.

  When the mail address is passed, the mail transmission means 347 displays a management screen similar to the management screen shown in FIG. 12 displayed on the display unit 37 via the second transmission / reception unit 33 and the antenna unit 31. To the above e-mail address. By looking at this management screen, the parents of a beach bather (for example, a child) in a dangerous water area can confirm the position of the child and take measures to return the child to a safe place.

  The display control unit 345 displays a map of the monitoring target area on the display unit 37 in accordance with the map data stored in the map data storage unit 352. Also, based on the current position stored in the entry whose rental flag is “1” among the entries in the sensor network management information storage unit 351, the location of the bather on the map is shown. In addition, for the current position in the entry for which the alarm flag is “1”, ★ is flashed and the display color is different from other ★. Make it different.

[Other Embodiments of the Invention]
Next, a second embodiment of the present invention will be described. The present embodiment is characterized in that in addition to the sensor network machines 1A to 1F and the management terminal 3, a fixed repeater fixed at a predetermined position in the monitoring target area is provided.

  In the first embodiment, the current position of the bather is surely transmitted to the management terminal 3 by increasing the stepwise transmission power level until communication with other sensor network machines and management terminals becomes possible. ing. However, when the transmission power level is increased, the usable time is shortened. In the present embodiment, as shown in FIG. 13, a fixed number of fixed repeaters 1300 are arranged at predetermined positions in the monitoring target area, thereby eliminating the above-described disadvantages.

  Referring to FIG. 13, the fixed repeater 1300 includes an antenna unit 1301, a transmission / reception unit 1302, a control unit 1304 having a response unit 1305 and a relay unit 1306, a power source unit 1307, and a power cable 1308.

  Operating power is supplied to the power supply unit 1307 from a monitoring center or the like via a submarine cable 1308. For this reason, in the fixed repeater 1300, the transmission power level can be increased.

  The transmission / reception unit 1302 has a function of exchanging data with the sensor network devices 1A to 1F and the management terminal 3 via the antenna unit 1301.

  When receiving the inquiry message from the sensor network devices 1A to 1F, the response unit 1305 transmits the response message to the inquiring sensor network devices 1A to 1F. The response message includes the number of hops “1”, and the address AddK assigned to the fixed repeater 1300 is set as the source address.

  The route information management means 131A in each of the sensor network devices 1A to 1F handles the response message from the fixed repeater 1300 in the same manner as the response message sent from the sensor network device (see FIG. 6). However, when there is a response message from the fixed repeater 1300 (the number of hops included in this response message is “1”) and a response message from the sensor network device including the number of hops “1” in step S66. The fixed repeater 1300 may be prioritized. That is, the address AddK of the fixed repeater 1300 may be preferentially stored in the route information storage unit as the destination address.

  When receiving the current position notification addressed to the fixed repeater 1300, the relay unit 1306 transmits the current position notification to the management terminal 3.

  FIG. 14 is a diagram illustrating an example of a fixing method of the fixed repeater 1300. In the example of the figure, the fixed repeater 1300 is fixed to the buoy 1400, and the buoy 1400 is fixed to the seabed by a rope 1401.

It is a block diagram which shows the structural example of 1st Embodiment of the drought accident prevention system concerning this invention. It is a block diagram which shows the structural example of 1 A of sensor network machines. It is a figure which shows the example of the content of the path | route information storage part 14A. 3 is a block diagram illustrating a configuration example of a management terminal 3. FIG. It is a figure which shows the example of the content of the sensor network machine management information storage part 351. FIG. It is a flowchart which shows the process example of a process performed when the route information management means 131A-131F becomes route information update timing. It is a flowchart which shows the process example of a process performed when the route information management means 131A-131F receives an inquiry message. It is a flowchart which shows the process example of the process performed when present position notification means 132A-132F comes to a position transmission timing. It is a flowchart which shows the process example of a process performed when present position notification means 132A-132F receives present position notification. It is a flowchart which shows the process example of the process performed when the present position management means 342 receives a present position notification. It is a flowchart which shows the process example of the determination means 343. 6 is a diagram illustrating an example of a management screen displayed on a display unit 37. FIG. FIG. 11 is a block diagram showing a configuration example of a fixed repeater 1300. 6 is a diagram illustrating an example of a fixing method of the fixed repeater 1300. FIG.

Explanation of symbols

A to F ... beach bathers 1A to 1F ... sensor network machine 10A ... antenna unit 11A ... transmission / reception unit 12A ... GPS unit 13A ... control unit 131A ... route information management means 132A ... current position notification means 133A ... relay means 134A ... alarm means 135A ... power supply control means 14A ... route information storage unit 15A ... alarm unit 16A ... power supply unit 2A-2F ... hat 3 ... management terminal 31 ... antenna unit 32 ... first transmission / reception unit 33 ... second transmission / reception unit 34 ... control unit 341 ... Response means 342 ... Current position management means 343 ... Determination means 344 ... Alarm transmission means 345 ... Display control means 346 ... User information registration means 347 ... Mail transmission means 35 ... Storage device 351 ... Sensor network device information storage section 352 ... Map Data storage unit 353 ... Tide level data storage unit 36 ... Input unit 37 ... Display unit
1300 ... Fixed repeater
1301 ... Antenna part
1302: Transmitter / receiver
1304 ... Control unit
1305 ... Response means
1306 ... Relay means
1307… Power supply
1308 ... Power cable
1400 ... Buoy
1401 ... Rope

Claims (13)

In a water accident prevention system that includes a sensor network machine that each user wears and a management terminal,
Each sensor network machine is
When the current position of the device itself cannot be transmitted directly to the management terminal, the current position is transmitted to the management terminal via another sensor network device that can communicate with the management terminal.
The management terminal is
A water accident prevention system characterized by having a configuration for determining whether a user wearing the sensor network device is in a dangerous water area based on the received current position of the sensor network device. In a water accident prevention system that includes a sensor network machine that each user wears and a management terminal,
Each sensor network machine is
When the current position of the own device cannot be directly transmitted to the management terminal, the current position is set to the sensor network device having the smallest number of hops to the management terminal among other sensor network devices that can communicate with the own device. It has a configuration to transmit, and when the current location is sent from another sensor network machine, has a configuration to relay the current location to the next hop,
The management terminal is
A water accident prevention system characterized by having a configuration for determining whether a user wearing the sensor network device is in a dangerous water area based on the received current position of the sensor network device. In the water accident prevention system according to claim 2,
A fixed repeater fixed at a predetermined position for relaying the received current position to the management terminal; and
Each sensor network machine is
When the current position of the device itself cannot be transmitted directly to the management terminal, the water accident prevention system is configured to transmit the current position to the fixed repeater if communication with the fixed repeater is possible. . In the water accident prevention system according to claim 2,
Each sensor network machine is
Position detecting means for detecting the current position of the own device;
If the current position detected by the position detecting means cannot be transmitted directly to the management terminal, the sensor network machine having the smallest number of hops with the management terminal among other sensor network machines capable of communicating with the own device. Current position notifying means for transmitting the current position to,
Relay means for relaying the current position sent from another sensor network machine to the next hop,
The management terminal is
A water accident prevention system comprising: determination means for determining whether a user wearing the sensor network device is in a dangerous water area based on the received current position of the sensor network device. In the water accident prevention system according to claim 4,
Each sensor network machine is
A water accident prevention system comprising power control means for increasing transmission power when transmitting a current position when there is no sensor network device capable of communicating with the device itself. In the water accident prevention system according to claim 4,
The management terminal is
The determination means comprises an alarm transmission means for transmitting an alarm signal to the sensor network device of the user who is determined to be in a dangerous water area,
Each sensor network machine is
A water accident prevention system comprising alarm means for issuing an alarm to a user wearing the apparatus when an alarm signal addressed to the apparatus is sent from the management terminal. In the water accident prevention system according to claim 4,
A water accident prevention system characterized in that the determination means has a configuration for changing a dangerous water area based on tide level data indicating tide fullness. In the water accident prevention system according to claim 4,
The determination means is
A water accident prevention system characterized by having a configuration for determining whether or not the user is in a dangerous water area according to the water depth declared by the user. In the water accident prevention system according to claim 4,
A water accident prevention system comprising portable notification means for notifying a portable terminal declared by a user of the current position of the user. The water accident prevention system according to any one of claims 1 to 9,
A water accident prevention system, wherein the sensor network device is fixed to a hat worn by the user. A sensor network machine installed on a user,
When the current position of the own device cannot be directly transmitted to the management terminal, the current position is set to the sensor network device having the smallest number of hops to the management terminal among other sensor network devices that can communicate with the own device. A sensor network device having a configuration for transmitting and having a configuration for relaying the current location to the next hop when the current location is sent from another sensor network device. If the specific sensor network device attached to the user cannot directly transmit the current position of the own device to the management terminal, the hop between the sensor network device capable of communicating with the own device and the management terminal Send the current position to the smallest sensor network machine,
The sensor network machine from which the current position is sent from another sensor network machine transmits the current position to the next hop,
A water accident prevention method, wherein the management terminal determines whether the user is in a dangerous water area based on the received current position of the specific sensor network device. A program for causing a computer having a position detection means for detecting a current position to function as a sensor network machine,
The computer,
When the current position detected by the position detection means cannot be transmitted directly to the management terminal, among other sensor network machines that can communicate with the own device, for the sensor network machine with the smallest number of hops to the management terminal Current position notification means for transmitting the current position,
A program for functioning as relay means for relaying the current position sent from another sensor network machine to the next hop.

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