Research of Query Reformulation in Digital Library
数字图书馆中的检索式扩展方法研究

This paper has studied several basic methods of automatic query reformulation,including pseudo relevance feedback,document clustering and term co-occurrences,then analysis these application feasibility in the environment of digital library.On this basis,recommends the method of query reformulation based on concept.Finally,recommends one method to transform knowledge organization tool(the classification,thesaurus) in the traditional library,constructs the knowledge network in order to support the method of query reformulation based on concept.