Full-text retrieval system and method

A retrieval system and full-text technology, applied in the fields of instruments, calculations, electrical digital data processing, etc., can solve problems such as lack of full-text retrieval
CN100412864CActive Publication Date: 2008-08-20KK TOSHIBA +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
KK TOSHIBA
Publication Date
2008-08-20

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Abstract

A first search unit (13) executes a search based on an N-gram index (14) by using a first search according to searching condition sentences and a secondary search aiming at the results of the first search. A morpheme analysis unit (15) can conduct the morpheme analysis on the searching condition sentences. A second search unit (16) executes a morpheme search based on a morpheme index (17) according to the analysis results of the morpheme analysis unit (15). An approximation-degree decision unit (183) can decide the approximation degree between the first hit value of the hit values of the first search based on the N-gram index (14) and the second hit value of the hit values of the morpheme search based on the morpheme index. A full-text search executes a control unit (18), and the secondary search based on the N-gram index can be omitted, and the first search unit (13) can be controlled when the first hit value is approximate to the second hit value; and the results of the first search or the results of the morpheme search can be taken as search results.
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Description

technical field

[0001] The invention relates to a full-text retrieval system and method suitable for rapidly searching documents meeting specified retrieval conditions by using a full-text retrieval technology from huge electronic document information. Background technique

[0002] Many kinds of retrieval systems have been developed to retrieve documents that meet specified retrieval conditions from among electronically huge document information. As a typical retrieval method for document retrieval applied to such a retrieval system, a retrieval method based on an N-gram (N-hyphenate) index or a retrieval method based on a morpheme index is known. The retrieval method based on N-gram index is used in full-text retrieval. On the other hand, a retrieval method based on a morpheme index is used in natural language retrieval (concept retrieval). An outline of these search methods is as follows.

[0003] <Retrieval method based on N-gram index>

[0004] A character stri...

Claims

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