Abstract: The flight control part 201 makes the unmanned aerial vehicle fly along a flight path in a predetermined area. The radio wave acquisition part 202 acquires radio wave information including a radio wave intensity when the radio unit of the unmanned aerial vehicle detects a short-distance radio wave of the user terminal during the flight of the unmanned aerial vehicle. The flight position acquisition part 203 acquires GPS position information of the unmanned aerial vehicle when the radio unit detected the short-distance radio wave, as a flight position of the unmanned aerial vehicle based on a GPS unit of the unmanned aerial vehicle. The terminal position calculation part 204 calculates a presence position of the user terminal in the area based on a radio wave intensity of the acquired radio wave information, and the acquired flight position of the unmanned aerial vehicle.

Abstract: The flight control part 201 makes the unmanned aerial vehicle fly along a flight path in a predetermined area. The radio wave acquisition part 202 acquires radio wave information including a radio wave intensity when the radio unit of the unmanned aerial vehicle detects a short-distance radio wave of the user terminal during the flight of the unmanned aerial vehicle. The flight position acquisition part 203 acquires GPS position information of the unmanned aerial vehicle when the radio unit detected the short-distance radio wave, as a flight position of the unmanned aerial vehicle based on a GPS unit of the unmanned aerial vehicle. The terminal position calculation part 204 calculates a presence position of the user terminal in the area based on a radio wave intensity of the acquired radio wave information, and the acquired flight position of the unmanned aerial vehicle.

Abstract: First, a terminal device (1) transmits a connection request to a server device (2) (step S1). When receiving this connection request, the server device (2) selects a single piece of cipher key data (71) from a cipher key data set (62) corresponding to the terminal device 1 (step S2), and transmits a key identifier (72) of the selected cipher key data (71) to the terminal device (1) (step S3). When receiving the key identifier (72), the terminal device (1) reads a key identifier (52) identical with the key identifier (72) from key list data (21), enciphers the received key identifier (72) with cipher key data (51) corresponding thereto (step S4), and transmits it to the server device (2) (step S5). When receiving the enciphered key identifier (72), the server device (2) deciphers it (step S6), and compares the deciphered key identifier (72) and the key identifier (72) of the cipher key data selected before(step S7).

Abstract: In a flow meter, a cylindrical member containing therein a vane wheel is fitted in a measuring chamber of a casing so as to be closely in contact with the peripheral wall of the casing, and a cover is put on the cylindrical member. Rectangular inlet and outlet nozzles in a side wall portion of the cylindrical member communicate with inlet and outlet ports of the casing, respectively. A pivot supporting the vane wheel is replaceably attached to a bottom portion of the cylindrical member. A supporting shaft of the vane wheel extends upward through a center opening in the cover to be connected to a measuring mechanism.