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| 多关键字查询中LCA剪枝概念树的查询扩展技术研究 | |
| 引用本文： | 王昭龙,李霞,许瑞芳. 多关键字查询中LCA剪枝概念树的查询扩展技术研究[J]. 计算机科学, 2010, 37(4): 132 |
| 作者姓名： | 王昭龙 李霞 许瑞芳 |
| 作者单位： | 1. 中国航空计算技术研究所,西安,710068 2. 西北工业大学计算机学院,西安,710072 3. 中国电子科技集团公司第二十八研究所,南京,210007 |
| 基金项目： | 国家自然科学基金(No.60803043);;国家高技术研究发展计划(863)(No.2009AA1Z134)资助 |
| 摘 要： | 语义查询扩展中,关键一步是扩展词的选择方法和扩展词权重的计算。提出一种改进的LCA(局部上下文分析法):OLCA(Optimize Local Context Analysis)。OLCA应用于分权重的多关键字查询中,结合WordNet概念树,从语义和实际查询语料两方面对初始查询词进行扩展,并根据初始查询词中多个关键词的位置,结合扩展候选集中词间关系计算修正各扩展词的权重。实验证明,与单独基于统计或基于语义的查询扩展方法相比,其查准率和查全率均有较大提高。 |
| 关 键 词： | 多关键字 查询扩展 概念树 局部上下文分析法 |
| 收稿时间： | 2009-10-09 |
| 修稿时间： | 2009-12-10 |
Multi-keywords Query Expansion with OLCA Based Concept Tree Pruning |
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| WANG Zhao-long,LI Xi,XU Rui-fang. Multi-keywords Query Expansion with OLCA Based Concept Tree Pruning[J]. Computer Science, 2010, 37(4): 132 | |
| Authors: | WANG Zhao-long LI Xi XU Rui-fang |
| Affiliation: | China Aeronautics Computing Technique Research Institute/a>;Xi'an 710068/a>;China;School of Computer Science/a>;NorthWestern Polytechnical University/a>;Xi'an 710072/a>;China;No.28 Institute of China Electronic Technology Corporation/a>;Nanjing 210007/a>;China |
| Abstract: | In semantic-based query expansion,computing expansion words and its weight is a key step to describe the needed query.We proposed a method called OLCA(keyword to concept method),the idea comes from LCA(Local context analysis).We made some i mprovement and applied it to multi-keywords query with different weight according to their attribute to the query.Combined with concept tree based on WordNet,we made the query expansion performed fromboth semantic and the real query documents aspects,and calculated the w... |
| Keywords: | Multi-keywords Query expansion Concept tree Local context analysis |
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