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Information retrieval system, an information retrieval method, a program for executing information retrieval, and a storage medium wherein a program for executing information retrieval is stored

  • US 20030159106A1
  • Filed: 10/23/2002
  • Published: 08/21/2003
  • Est. Priority Date: 10/23/2001
  • Status: Active Grant
First Claim
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1. An information retrieval system for retrieving documents added to a database with respect to time, said documents being converted into document-attribute matrix and stored within said information retrieval system, and said document-attribute matrix being constituted by document-attribute submatrices added in order with respect to time, said information retrieval system comprising:

  • means for generating and storing a predetermined type matrix from said document-attribute matrix, means for generating said document-attribute submatrix from documents being added to said database during a specific time period, means for updating said predetermined type matrix using knowledge with respect to said document-attribute submatrix and for executing singular value decomposition on updated said predetermined type matrix to execute dimension reduction of all document-attribute matrices stored within said database, and means for retrieving information with respect to a user input query using said dimension reduced document-attribute matrix.

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