Automatic Thesaurus Extraction for Thai Text Retrieval Enhancement

Thesaurus is one of the most important components for information retrieval (IR) systems. A thesaurus provides a precise and controlled vocabulary that serves to coordinate document indexing and retrieval then it improves the retrieval effectiveness. However the major problem with the manual thesaurus is a laborintensive task and therefore also expensive to build and hard to update in timely manner. Consequently, this paper proposes one approach to construct Thai thesaurus automatically, called a Thai association thesaurus, based on the statistical technique and natural language processing technique.