Hitachi, Ltd.

Nobuyoshi Ando

Katsumi Kawano

Takeiki Aizono

Hiroshi Wataya

Nobuhisa Kobayashi

Takamasa Kawaguchi

Takayoshi Fujioka

Mika Kasahara

Naoki Mitsuyoshi

Yoshihito Yoshikawa

Maki Nagano

A first server in a system includes confirmation requesting unitthat receives an authentication request from a predetermined apparatuscoupled through a public line and that sends a user confirmation request to a second server in the case where user authentication is successful. A second server includes a user facility identifying unitthat receives the user confirmation request from the first server and identifies location information of the user facility of the user and a confirmation result notifying unitthat receives a utilization request from a measuring apparatus linked through a dedicated line and identifies disposition location information of the measuring apparatus and that sends a notification of success of user confirmation including the identification information of the user to the first serverif the disposition location information of the measuring apparatus is identical to the user facility location information.

Data communication method and data communication system

A wireless device according to the present invention minimizes the need for changing a communication route in an ad hoc network including wireless devices used for base stations, fixed stations, and mobile stations that are turned on/off or moved, wherein, when wireless devices cannot directly send or receive radio waves, data can be transmitted between them by relaying data via other wireless devices that can directly send or receive radio waves (multi-hopping). In selecting a communication route, a communication route that includes wireless devices that are turned off or moved least frequently is selected.

Wireless device, method for wireless communication system, and wireless communication system

An appliance located states accumulating method includes the steps of, receiving state information indicating operating state changes of the appliances constituted of a distributed computer through a network, calculating an occurrence time difference from the state changes occurred in the appliances in accordance with occurrence time information indicative of occurrence times of the state changes included in the state information, and calculating the positional relation of the positions, where the appliances occur the state changes, from the calculated occurrence time difference, thereby accumulating the positional relation of the installed appliances.

Method of accumulating appliance located states and apparatus using the same

In a distributed processing system including a plurality of intelligent devices such as an optical sensor and a processing machine connected via a network to each other, when a first optical sensor is moved from a first section to a second section, if an identifier indicative of the second section is set, then the first optical sensor transmits a retrieve message containing this identifier via the network so as to seek a second optical sensor which is set to the same second section. Then, the first optical sensor acquires a setting parameter from the second optical sensor, and executes an operation in cooperation with the second optical sensor set in the same second section. As a result, in such a distributed processing system including a plurality of computers (intelligent devices) whose processing contents are different from each other, depending upon setting places thereof, workloads for changing the setting values of these computers can be reduced.

Distributed processing system and cooperating method

Growing community of inventors

Kawasaki, Japan

Nobuyoshi Ando