Melbourne University 2005: Enterprise and Terabyte Tracks


Vo Ngoc Anh
Department of Computer Science and Software Engineering, The University of Melbourne, Victoria 3010, Australia.

William Webber
Department of Computer Science and Software Engineering, The University of Melbourne, Victoria 3010, Australia.

Alistair Moffat
Department of Computer Science and Software Engineering, The University of Melbourne, Victoria 3010, Australia.


Status

To appear in the 2005 TREC Notebook Proceedings.

Abstract

Ths report describes the work done at The University of Melbourne for the TREC-2005 Enterprise and Terabyte Tracks. In the Enterprise track, we participated in the discussion task. We tried a number of different methods to make use of special features of mailing lists to improve retrieval effectiveness, and found the use of thread context to be promising. In the Terabyte track, we continued our work with impact-based ranking and sought to reduce indexing as well as query time. A new retrieval system has been developed for this purpose and has shown several improvements over our system from last year.