Concept Based Query Expansion

Concept based search is a method that enhances information retrieval systems using semantic relationships. The recall in concept based search is relatively low. That low recall comes from the fact that it is not easy to represent a concept completely. Query expansion intends to fill a gap because concept representation is always partial. Query expansion improves the recall. In this paper we present an expansion method for a concept based information retrieval. Our method uses semantic relatedness to extend user query through an undirected graph of concepts.