Expansion of Chinese Words in Information Retrieval
Resource
資訊傳播與圖書館學 8(1)，2001年9月，59-75
Journal
資訊傳播與圖書館學
Pages
59-75
Date Issued
2001
Date
2001
Author(s)
莊雅蓁
Abstract
This thesis aims at three important
issues for query expansion: whether the automatic
constructed synonym dictionary could enhance the
retrieval effectiveness, which relationship of thesaurus
has the best performance, and the effectiveness of the
integration of synonym dictionary and thesaurus. In the
experiments of query expansion, the queries are
expanded in different models, including expanding by
either synonym dictionary or thesaurus or both. Finally,
performance is evaluated in precision. The results show
that query expansion using second level of synonym
dictionary has better performance. Though the effects of
different relationships prescribed in the thesaurus are
similar, expanding by union of all relationships shows
better performance. The model of first expanding query
by synonym dictionary then modifying it by thesaurus
has improved retrieval performance slightly, but the
performance is decreased in further expansion. We also
find that the correctness of word segmentation has a
great impact on the quality of synonym dictionary. The
mode of string mapping is another important factor.
Subjects
Information Retrieval
Query Expansion
Thesaurus
Synonym
Publisher
臺北市:國立臺灣大學圖書資訊學系
Type
journal article
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