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Query expansion has been considered as an effective technique for dealing with the fundamental issue of word mismatch in information retrieval for a long time. So far researchers solve this major problem through a wide variety of query expansion techniques. We primarily discuss the query expansion based on local analysis. It includes local feedback, local context analysis (LCA) and local clustering. What's more, we briefly analyze the merits, demerits and other related issues among these techniques. Finally, we present some suggestions and pave the way for promising directions for future research.
Date of Conference: 1-3 Nov. 2011