Document similarity calculation apparatus, clustering...

Data processing: database and file management or data structures – Database design – Data structure types

Reexamination Certificate

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C707S793000, C707S793000, C707S793000

Reexamination Certificate

active

07451139

ABSTRACT:
An input section inputs a document set. A normalization section calculates a similarity as a relative value between documents, with respect to combinations of a plurality of documents, in the document set. The normalization section employs the tf·idf method. In tf·idf method, a document vector and a significance of a word included in the document is used to perform normalization to convert each similarity to an absolute value.

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patent: 2002/0156760 (2002-10-01), Lawrence et al.
patent: 2002/0184267 (2002-12-01), Nakao
patent: 2000-250925 (2000-09-01), None
patent: 2001-067364 (2001-03-01), None
patent: 2002-041573 (2002-02-01), None
Maarek, Fagin, Gen-Shau and Pelleg, “Ephemeral Document Clustering for Web Applications”, IBM Research Report, RJ 10186, Apr. 2000.
Japanese Office Action for corresponding Japanese Patent Application No. 2002-062239 dated Sep. 25, 2007.

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