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This paper is an overview of the runs carried out at TREC 2011 Session track, which proposes several approaches to improve the retrieval performance over one session including the search model based on user behavior, VSM_meta similarity model, optimization based on history ranked lists, optimization based on user"s attention time and anchor log. The evaluation results show that our implementations are effective.dblp:conf/trec/LiuZGXH11 fatcat:geabqvmllbawrjci3ksitgrxtm