System for processing natural language including identifying grammatical rule and semantic concept of an undefined word

Patent 5109509 Issued on April 28, 1992. Estimated Expiration Date:

April 28, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Hitachi, Ltd.

Application

No. 277526 filed on 11/28/1988

US Classes:

704/9Natural language

Examiners

Primary: Lee, Thomas C.
Assistant: Mohamed, Ayni

Attorney, Agent or Firm

Antonelli, Terry, Stout & Kraus

Foreign Patent References

2014765 GB 08/13/1979
1596411 GB. 08/13/1981
2122782 GB. 01/13/1984

International Class

G06F 015/38

Foreign Application Priority Data

1984-10-29 JP

Abstract

A natural language including Japanese, Korean, Chinese, etc., is suitably processed when an undefined word which is not registered in a dictionary appears in an input character train. When the undefined word appears, a semantic analysis processor decides a semantic concept of the undefined word by using a case dictionary. Further, by using a vocabulary hierarchy dictionary, which registers vocabularies in a hierarchy structure, the semantic analysis processor extracts a group of vocabularies (synonyms) corresponding to a lower concept of the semantic concept of the undefined word. The natural language processing can be achieved practically and efficiently with dictionaries of a limited storage capacity.