A Definitional Question Answering System Based on Phrase Extraction Using Syntactic Patterns

Kyoung-Soo HAN  Young-In SONG  Sang-Bum KIM  Hae-Chang RIM  

IEICE TRANSACTIONS on Information and Systems   Vol.E89-D   No.4   pp.1601-1605
Publication Date: 2006/04/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e89-d.4.1601
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Natural Language Processing
definitional question answering,  phrase extraction,  

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We propose a definitional question answering system that extracts phrases using syntactic patterns which are easily constructed manually and can reduce the coverage problem. Experimental results show that our phrase extraction system outperforms a sentence extraction system, especially for selecting concise answers, in terms of recall and precision, and indicate that the proper text unit of answer candidates and the final answer has a significant effect on the system performance.