摘要
针对用户获取事件类信息的需求,提出了一种基于局部分析面向事件LA-EO(localanalysis-eventoriented)的查询扩展方法,该方法将查询项区分为事件项和限定项两类分别处理。文章重点讨论了面向事件的查询项分析、事件项的扩展以及查询项与文本相似度的计算等问题。围绕突发事件领域,使用搜索引擎和定点采集相结合的方法收集了4011篇文本,设置了10个查询项对本文提出的方法进行了实验比较。结果表明:LA—EO与Rocchio机制(记作LA—Rocchio)和局部上下文分析(记作LA—LCA)扩展方法相比,对事件类信息的检索,LA—EO具有更优的检索性能。
Aiming at the demand for event information by users, we propose a method local analysis-based event- oriented (LA-EO) query expansion, which divides query terms into two categories:event terms and qualifying terms. The paper emphatically discusses the analysis of event-oriented query terms, the expansion of event terms and the computing between query terms and documents. We have collected 4011 documents and set ten query topics centering on emergency domain to evaluate our proposed methods. The results show that LA-EO query expansion offers more effective performances for retrieving events, compared with LA-Rocchio and LA-LCA.
出处
《情报学报》
CSSCI
北大核心
2012年第2期151-159,共9页
Journal of the China Society for Scientific and Technical Information
基金
基金项目:国家自然科学基金项目(60975033)、国家科技部项目(2009GJC10043).