USC/ISI at TREC 2011: Microblog Track

PKU_ICST at TREC 2011 Microblog Track

This paper describes the PKU_ICST participation in the TREC 2011 Microblog track. In the first year of Microblog track, we designed a group of experiments to verify whether external resources and future resources would improve the performance of our system. Moreover, given that microblog track is a real-­‐‐time adhoc task, we explored an ap...

University of Lugano at TREC 2011 Microblog Track

In this document we present the participation of University of Lugano in the Microblog track of TREC 2011. We describe our approach based on a time-based filtering algorithm of retrieved documents. We highlight the results and the possible improvement of the described technique.

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 scor...

HIT_LTRC at TREC 2011 Microblog Track

This paper describes our entry into the TREC 2011 Microblog track. We submitted two runs in this year’s track, both in real-time fashion and without any external resources. The runs were generated through a three-step procedure, including scoring, threshold selection and re-ranking. The evaluation results of our submitted runs significantly outperform the disjunctive baseline run. We conducted ...

Yandex at TREC 2011 Microblog Track