Research of the conceptual representing of documents based on light ontology

The traditional method of presenting a document in an Information Retrieval(IR) system is based on terms. As the the new words appear dramatically in the Internet era, this kind of method draws back the IR system´s performance. This paper puts forward an approach by using the concepts of the ontology to present the documents. Constructing the Word-Concept(W-C) model and Concept-Document(C-D) model, we compute the relevance of word-word , word-concept and concept-document. They are used to determine which page is most relevant to the query. It is proofed to be more effective than prevenient.