关键词:
检索系统
领域本体
设计
信息检索技术
扩展算法
查询扩展
计算机技术
网络资源
摘要:
Rapid developing information retrieval technology has become one of the most important means of obtaining useful information from massive web resources. However, traditional keyword-based information retrieval has encountered several major bottlenecks, such as theme drift, low recall and meaning lacking. Combining topic information retrieval with ontology-based semantic technology is one of those effective methods to improve above mentioned shortages. To prove the idea, this paper tries to design and implement a retrieval system based on the computer technology domain ontology, which is constructed on basis of the existing ontology theory. For better effect, this paper makes some improvements to the existing semantic similarity algorithms and designs a new query expansion algorithm. Results show that the prototype system acts efficiently on query extension and topic information search. To certain extent, it improves the recall and precision of keyword based retrieval system.