Hitachi, Ltd.

Takaaki Yayoi

Yoshitaka Sato

Makoto Takahashi

Shinichi Takahashi

Kei Takeda

Tadataka Matsubayashi

Yasuhiko Inaba

Shinya Yamamoto

Yuichi Ogawa

Tomoko Susaki

Masayuki Hamakawa

An 'inter-reader rule extracting portion' is provided to extract rules existing among the sets of ID acquired by the respective readers. In addition, the state in which a predetermined number of rules are invalid is defined as the time to change the service, and at the time of changing the service, the latest rules produced by an 'inter-reader rule re-constructing portion' that reconstructs rules are used to monitor a system.

Sensor device management system and method

A personal digital assistant includes an input section for designating, when a user requests information based on positional information, whether user desires to acquire wide-area information or narrow-area information. If acquisition of narrow-area information is desired, a managing server removes noise by a noise removal processing section which makes a check to determine whether or not the wide-area information is noise. Hence, information desired by the user is preferentially displayed.

Information delivery system and method using positional information

A method for retrieving information from a computer system including a user terminal and a storage area, includes retrieving first information from the storage area using a first search query, the first search query having a first element and a first weight that is associated with the first element. The first search query has been formulated to retrieve target information. The first information includes at least a first data block. Second information is retrieved from the storage area using a second search query. The second search query has the first element, and a second weight that is associated with the first element. The second search query is derived from a relevance feedback provided on the first data block of the first information. An end-search criterion is provided to the user terminal. The end-search criterion provides information as to whether or not to end a first retrieval procedure for the target information. The first retrieval procedure being associated with a search query set, the search query set including a plurality of search queries, each having the first element.

Similarity-based search method by relevance feedback

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Yokohama, Japan

Takaaki Yayoi