Abstract: A service providing device includes a storage unit configured to store driver management information including at least driver identification information, a reception unit configured to receive the driver identification information from the in-vehicle device, a determination unit configured to determine whether the driver management information including the driver identification information received by the reception unit is stored in the storage unit, an acquisition unit configured to acquire the driver management information from one or more other service providing devices connected to the service providing device over a network the determination unit determines that the driver management information is not stored in the storage unit, an authentication unit configured to authenticate the in-vehicle device based on the acquired driver management information, and a providing unit configured to provide the service to the in-vehicle device when the authentication has been successful.

Abstract: A service providing device includes a storage unit configured to store driver management information including at least driver identification information, a reception unit configured to receive the driver identification information from the in-vehicle device, a determination unit configured to determine whether the driver management information including the driver identification information received by the reception unit is stored in the storage unit, an acquisition unit configured to acquire the driver management information from one or more other service providing devices connected to the service providing device over a network the determination unit determines that the driver management information is not stored in the storage unit, an authentication unit configured to authenticate the in-vehicle device based on the acquired driver management information, and a providing unit configured to provide the service to the in-vehicle device when the authentication has been successful.

Abstract: A multi-cavity klystron device having a plurality of resonance cavities, comprising a plurality of movable elements, each of which is mounted on each of said resonance cavities and which is adapted to change the resonance frequency in each cavity, a plurality of tuning means for giving a reciprocal movement to each movable element against a resilient member provided therefor, a plurality of pulse motors coupled to the tuning means, and a preset means for controlling pulse supply to each pulse motor, wherein a predetermined number of pulses stored in the memory units of the preset means are selectively applied to the pulse motors to rotate each pulse motor in correspondence with the number of pulses, thereby changing each resonance frequency of each cavity.

Abstract: A cavity resonator having adjustably tunable resonant frequency in which tuning of the resonant frequency is carried out by means of a movable side plate, characterized in that contactor pieces supported by the edges of said movable side plate for realizing high frequency short-circuiting to a cavity wall, consist of metallic wires, each of which is wound in a coil shape preferably having a diameter that is no greater than the distance between the opposite side plate edges in which the coils are mounted.