Qiang Pu

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Pseudo relevance feedback has demonstrated to be in general an effective technique for improving retrieval effectiveness, but the noise in the top retrieved documents still can cause topic drift problem that affects the performance of certain topics. By viewing a document as an interaction of a set of independent hidden topics, we propose a novel semantic(More)
This paper reports University of Pittsburgh's participation in GeoCLEF 2008. As the first time participants, we only worked on the monolingual GeoCLEF task and submitted four runs under two different methods. Our GCEC method aims to test the effectiveness of our online geographic coordinate extraction and clustering algorithm, and our WIKIGEO method wants(More)
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