National Taiwan University at Terabyte Track of TREC 2005

There are three tasks in the Terabyte track of TREC 2005, i.e. Efficiency, Ad hoc and Named page finding. We participated in all the tasks and use different retrieval methods to deal with each task, aiming to vary the retrieval method according to the different characteristics of different tasks. In Ah hoc task, we adopt the technique of query-specific clustering. In Named page finding task, we cared more about the information of document title and anchor text of out-links.