Abstract:

Since the keyword-based search engine can not meet the needs of users and the traditional way of query expansion brings out the errors of semantic understanding, this paper proposes an ontology-based conceptual model of vertical search engines, and sets up a two-tier index structure based on keywords and concept. Taking advantage of industry domain ontology, it operates semantic query expansion to the key words which is submitted by the user, and optimizes the sorting of documents marked by ontology, then raises rate of precision and recall of the system.

Key words: vertical search, semantic query expansion, ontology, concept

摘要：

基于关键词的搜索引擎无法满足用户需求，传统查询扩展方式又会带来许多语义理解错误，针对该问题，提出一种基于本体的垂直搜索引擎概念模型，建立基于关键词和基于概念的两层索引结构，利用行业领域本体对用户提交的关键词进行语义查询扩展，并对按照本体标注的文档进行排序优化，提高查询的查全率和查准率。

关键词: 垂直搜索, 语义查询扩展, 本体, 概念

CLC Number: 

• TP311.12