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SAFETY & SECURITY


a Keep a door closed Room 3


Room 2


Room 1


Sound wave transmitter


b Keep a door open Room 3


Room 2


Room 1


Sound wave transmitter


Receive


Sometimes receive


Not receive Figure 5: Sound wave reception status at each measurement point.


Room 19


Room 20


Room 21


Room 22


Room 23


Room 24


Room 25


Room 26


Room 17


Room 18


Room 13


Room 12


Radio wave transmitter (beacon)


Room 11


Room 10


Room 9


Room 8


Room 7


Sound wave transmitter Figure 6: Sound and radio waves transmitters were installed on one floor.


that the sound waves are blocked by closing the door.


Ability to detect the positions Sound wave transmitters and radio wave transmitters were installed on one floor of the building, and the ability to detect the positions of people carrying smartphones was examined using the constructed location management system. Sound wave transmitters and radio wave transmitters on the ceiling at locations indicated by the red and blue squares shown in Figure 6. The radio wave transmitters were installed at the branching location of a hallway, and the


a b


sound wave transmitters were installed at the doorways of two adjoining rooms. Also, at the computer of the location management system, the radio wave detection sensitivity was set to –80 dbm or greater. With these conditions, a person carrying a smartphone walked in the order of the numbers 1 to 5 shown in Figure 6 and it was confirmed whether or not the movement history could be viewed from the client computer. Screens obtained by accessing the


location management system from the client computer are shown in Figure 7. When the targetted person is selected from the screen shown in Figure 7a the


Room 16


Room 15


Room 14


Room 6


Room 5


Room 4


Room 3


Room 2


Room 1


Sound waves do not pass through the structural materials of buildings, and so make it possible to accurately identify the location of a person even in a narrow space


order of movement of that person, or in other words, the movement history, is shown on a floor plan as shown in Figure 7b. When the movement history was confirmed, it was possible to confirm that the person moved in the order of numbers 1 to 5 shown in Figure 6. Accordingly, it was possible to correctly detect the position of a person using the constructed location management system.


Summary When only radio waves are used for location management of people in a building such as a hospital, which is filled with rooms of different sizes, the radio waves could pass through the structural materials of the building, making it difficult to correctly identify the location of the person. The use of both sound waves and radio waves for location management was trialled as a solution. Sound waves do not pass through the structural materials of buildings, and so make it possible to accurately identify the location of a person even in a narrow space. Radio wave and sound wave signals


from transmitters are received by smartphones, and data are then transmitted to a cloud based server using a carrier network circuit. Accordingly, there is no need to build a network for location management. The obtained data are processed by the location management computer, and can be viewed as the movement history on the client computer. Location management of the medical


Figure 7: Viewing of movement history of person carrying smartphone from client computer.


40


staff within a hospital is useful to manage the flow of medical treatment tasks to identify staff that have come into contact with an infected person when an infectious outbreak occurs, etc. This system, which accurately determines positions using both sound waves and radio waves, and can lead to more efficient operations by the medical staff as well as the safety management thereof. It was concluded that the system can be used for various types of management within a hospital.


IFHE IFHE DIGEST 2017


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