Ricoh Company, Ltd.

Hiroshi Takegawa

Kensaku Yamamoto

Kazushige Asada

Tetsuya Ikeda

Takuya Hiraoka

Yasushi Ogawa

Katsumi Kanasaki

Futoshi Oseto

Atsushi Iizawa

Toshio Itoh

Susumu Kanemune

Kazutaka Furuse

Hideaki Nakayama

A communication management apparatus for performing access control over a plurality of terminal devices is provided. The communication management apparatus includes a registration unit that accepts registration of a group of terminal devices to be granted permission of access among the plurality of terminal devices; and an access control unit that performs access control, if authentication information is set in association with the group in group information having information about the group, to permit access from one terminal device of the group of the terminal devices that supplies an input that matches the authentication information.

Communication management apparatus, program, communication management method, and communication management system

When a number of document data registered in one of full-text index-for-registration/deletion storage parts reaches a predetermined number, or when a capacity of the full-text index-for-registration/deletion storage part reaches a predetermined capacity, a merge processing is performed for merging data from the full-text index-for-registration/deletion storage part to a full-text index-for-search storage part. While this merge processing is performed, a registration/deletion processing is performed by using another full-text index-for-registration/deletion storage part.

Full-text search device performing merge processing by using full-text index-for-registration/ deletion storage part with performing registration/deletion processing by using other full-text index-for-registration/deletion storage part

Full-text search device performing merge processing by using full-text index-for-registration/deletion storage part with performing registration/deletion processing by using other full-text index-for-registration/deletion storage part

There is provided a document retrieval apparatus in which signatures can be easily extracted from document data, and false drop probability is reduced even for a long document so as to reduce a burden of eliminating the false drop. A processing unit converts the document data and the character string into character codes, respectively. The processing unit extracts signatures from each of the character codes, and calculates a record identifier of the document data to be stored based on a storing position of the document data in a record file. A data storing unit stores the document data to be registered in the record file, and stores the signature corresponding to the document data to be registered in a signature file. The signature is stored in a storing position in the signature file, the storing position being designated by the record identifier of corresponding document data stored in the record file. The processing unit retrieves the document data containing a character string identical to the character string to be searched for by referring to a record identifier calculated based on a storing position of the signature in a signature file.

Document retrieval apparatus retrieving document data using calculated

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Tokyo, Japan

Hiroshi Takegawa