公开(公告)号：JP2001312505A

公开(公告)日：2001-11-09

申请号：JP2000133323

申请日：2000-05-02

Applicant: IBM

Inventor： KOBAYASHI MEI ,  ROIKKU MARASHII ,  ROMANOS PIPERAKISU

IPC: G06F17/30

Abstract: PROBLEM TO BE SOLVED: To provide a method, a system and a recording medium that detect and trace new items and/or new classes of documents in a database afterward. SOLUTION: The method for detecting and tracing the new items and/or the new classes of documents in a database, to which the new items and/or the new classes are added and which contains the attribute data relating to a time parameter, gives a document vector using the attribute data including the time parameter, which are included in the document, detects and traces concurrently the new items and/or the new classes by using the vector.

公开(公告)号：JP2002024268A

公开(公告)日：2002-01-25

申请号：JP2000175848

申请日：2000-06-12

Applicant: IBM

Inventor： KOBAYASHI MEI ,  ROIKKU MARASHII ,  SAGAWA HIKARI

IPC: G06F17/30

Abstract: PROBLEM TO BE SOLVED: To retrieve and/or rank a document including attribute data in a database to which the document is added. SOLUTION: This method includes a step where a document matrix D including numeral elements derived from attribute data is generated from the document, a step where a covariance matrix K is formed from the document matrix D, a step where the covariance matrix K is decomposed into characteristic values, a step where the dimensions of a matrix V are decreased by using a specific number of characteristic vectors included in the matrix V and including the characteristic vector corresponding to the maximum characteristic value, a step where the dimensions of the document matrix D are decreased by using the matrix V having the dimensions decreased, and a step where documents in the database are retrieved and/or ranked by calculating the internal product of the document matrix D having the dimensions decreased and a query vector.