NTT DATA: Overview of system approach at TREC-8 ad-hoc and question answering

We submitted ve results as o cial runs. Two kinds of results, long query results (title, description and narrative) and short query results (title and description), were submitted. Another kind of result that applied query expansion technique or not applied was also submitted. In our work at TREC-8, we concentrated our interest on extraction of the query terms. Speci cally, we applied a removal technique of negative information in topics and speci cation of multiword phrases.