Fujitsu Laboratories TREC2001 Report

This year a Fujitsu Laboratory team participated in web tracks. Both for ad hoc task, and entry point search task, we combined the score of normal ranking search and that of page ranking techniques. For ad hoc style task, the e ect of page ranking was very limitted. We only got very little improvement for title eld search, and the page rank was not e ective for description, and narrative eld search. For entry point search task, we compared three heuristics. The rst heuristics supposed that entry point page contains key word and had high page rank score. The second heuristics supposed that entry point page contains key word in its head part and had high page ran score. The third heuristics supposes that entry point is pointed by the pages whose anchor string contains key word, and has high page rank score. The page rank improved the result of entry point search about 20-30% in rather small VLC10 test set, and the rst heuristics got the best result because of its high recall. 1 System Description For TREC2001, we added the new functions to trec exec for entry point search. The functions includes score merging, evaluation of reciprocal rankand so on. We usedWeb Recommener Agent to get pag