... of the Association for Computational Linguistics, pages 1367–1375,Uppsala, Sweden, 11-16 July 2010.c2010 Association for Computational LinguisticsA Unified Graph Model for Sentence-based ... relevant to the target concerned. Therefore, we argue that existing information representation i.e. bag-of-word, cannot satisfy the information needs for opinion retrieval. In this paper, ... and Ounis, 2006). Therefore, in this paper we regard the information needs for opinion retrieval as relevant opinion. 2.2 Motivation of Our Approach In traditional information retrieval (IR)...