The Research Of Ontology-Based Professional Search Engine

Based on our in-depth research about basic principles and key technologies developing of the professional search engine, this paper shows a viewpoint that to develop a professional search engine based on the field ontology. The article describes the teaching computer knowledge base by a set of concepts and terminology that Ontology provided, and gains the basic concepts of the field and the relationship of these concepts. In this paper, the concept and the inter-relationship in the computer education field are defined precisely by the Ontology Language OWL standard which is recommended by the W3C. On the one hand, which promotes understanding of machines; on the other hand, it solves the issue of access to knowledge fundamentally. In addition, through researching and discussing how to construct domain-knowledge base, the paper gets a new method which is suitable for constructing domain ontology of the system and then applies this method into the construction of computer education resources ontology. The domain ontology provides theme description for the theme crawler of professional search engine, which helps crawler finishing web related calculation based on the semantic. Meanwhile, the domain ontology provides semantic retrieval for user.In professional search engine-developed technology field, the realization of the network crawler is essential. This paper focuses on Design and Implementation of domain Ontology-based crawler, and presents a hyperlinks value strategy right to professional search engine which can forecast URL relevance from web content, website class structure, Hyperlink as several. In addition, this paper proposes the new way of outline-style content extraction method by analyzing features of computer education website, and semanticizes content of the website by using the concepts of domain ontology, thereby to improve the speed and accuracy of relevant web calculation, and improve the efficiency and accuracy of crawling at last.This paper constructs the domain ontology of computer education resources by using protégé. Network Crawlers are developed by taking JAVA as programming language and SQL Server2000 is used as DBMS. It designs the framework of Ontology-based professional search engine.