Keyword extracting system and text retrieval system using...

Details Keyword extracting system and text retrieval system using... Keyword extracting system and text retrieval system using...

1998-06-30

2001-04-03

Kulik, Paul V. (Department: 2177)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000

Reexamination Certificate

active

06212517

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a document retrieval system and more particularly to a subsystem of a document retrieval system for receiving a list of documents (or texts) selected from a text base and providing a list of keywords ranked in order of importance in the selected text group.
2. Description of the Prior Art
In order to retrieve one or more texts which best contain desired information in a conventional text retrieval system, the user has to input an appropriate query request by using keywords which best characterize the desired text(s). However, such keywords hardly occur to the user. It is especially true to those who are not familiar to the field of the desired text(s). For this purpose, various measures have been taken so far which help the user with his or her further searches by displaying related words associated through a kind of dictionary (e.g., a thesaurus, a synonym dictionary, etc.) with the keywords entered by the user. However, it is difficult to obtain related words responsive to characteristics of the desired text(s) because the obtained related words are dependent on a dictionary which has been statically prepared in advance. Further, making a query request by using the obtained related words not always results in a successful retrieval of at least one desired text.
It is therefore an object of the invention to provide a related keyword generating system, used in a document retrieval system, for receiving a list of documents (or texts) selected from a text base and providing a keyword list of words ranked in order of importance in the selected text group so as to facilitate an effective and quick document retrieval.
SUMMARY OF THE INVENTION
The above object is achieved by a method and system of assisting a user to search a text base in a text retrieval system having a function of receiving a query request and returning a list of text IDs of retrieved texts. The method comprises the steps of:
for each of texts constituting the text base, managing local statistical information on words, compound words and phrases (hereinafter, referred to en bloc as “words”) used in each said text,
managing global statistical information on words used in any of the texts constituting the text base;
the user selecting at least one desired text from the text base;
for each of words contained in the selected text(s), calculating a degree of importance by using the local statistical information for the selected text(s) and the global statistical information;
sorting the words contained in the selected texts in order of the degrees of importance;
displaying a predetermined number of the sorted words as related keywords; and
assisting the user to enter a query request by using the related keywords.


REFERENCES:
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G. Salton, “Automatic Text Processing,” 1989, pp. 229-371, Addison-Wesley, Reading, MA.*
Salton G. “Another Look At Automatic Text-Retrieval Systems”.
Salton G et al. “Term-Weighting Approaches In Automatic Text Retrieval”.
Gelbart D et al. “Beyond Boolean Search: Flexion, A Legal Text-Based Intelligent System”.

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