Research And Design Of Vertical Search Engine Based On Semantic Expansion Of Keywords

With rapid development of internet, too much information coming with it causes a problem--information overload. The emergence of search engines makes it possible to resolve the issue. In a short period of more than ten years, the search engine technology has been tremendously developed, at the same time, many outstanding search engine products have been invented and been widely used in our life and work, such as Google, Baidu and so on.From the develop situation of today's internet , the general search engines have been unable to meet some of the user's fields of expertise requirement, and then the vertical search engines come out. Vertical search engines are search engine technology apply to the professional domains. To different area, the design of the vertical search engine may be different.Traditional retrieval strategy based on keyword-matching is facing unavoidable bottleneck because of mechanical characters matching and synonym problems. To improve the recall ratio and precision ratio, a retrieval strategy based on domain ontology and semantic expansion of keywords is proposed. With the retrieval strategy, a vertical search engineer about military filed is designed.