DUTIR at TREC 2011 Microblog Track

In TREC 2011 Microblog Track, we explore the use of pseudo relevance feedback to expand original query terms in topics. Hyperlink is used to enhance the performance of the retrieval results. And we set a threshold of entropy to filter retrieval results. Microblog is a Realtime Adhoc Task, so we make use of average querytweettime that comes from pseudo relevance feedback to change retrieval score. We combine two models to improve retrieval results. The results show that our model is effective at realtime relevance retrieval