Document retrieval system

Details Document retrieval system Document retrieval system

1997-05-29

2000-11-28

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707 5, 707 6, G06F 1730

Patent

active

061547379

ABSTRACT:
A document retrieval system for searching a document coinciding with a retrieval request the user inputs and further ranking the document in accordance with the degree of coincidence between the document and the retrieval request. In the document retrieval system, a word frequency calculating section finds out the number of documents where a word appears, a frequency of occurrence of the word in a document and obtains a weighting parameter for the word, and a frequency score calculating section obtains a frequency score on the basis of the output of the word frequency calculating section. In addition, a word cooccurrence relation checking section checks word cooccurrence relations of the retrieval request and the document, and a cooccurrence score calculating section calculates a cooccurrence score from the degree of coincidence therebetween. A document score calculating section calculates a document score on the basis of the frequency score and the cooccurrence score. The documents are ranked in order of document score and displayed to the user.

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"Wordij: A Word-Pair Approach to Information Retrieval" Danowski J A: NIST Special Publication, Mar. 1993.
"Use of Subject Field Codes From a Machine-Readable Dictionary for Automatic Classificationof Documents" Liddy E D et al., No Date.

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