A QA System that Can Answer Any Class of Japanese Non-Factoid Questions and its Application to CCLQA EN-JA Task: Yokohama National University at NTCIR-7 ACLIA CCLQA EN-JA

In this paper, we reported the evaluation results of our CCLQA system at NTCIR-7 ACLIA. We participated in the English-Japanese (EN-JA) cross-lingual task and the Japanese mono-lingual task. The system consists of a question translation module and a nonfactoid-type Japanese question-answering system. The question translation module was developed for NTCIR-6 CLQA, which is a combination of an off-theshelf machine-translation product and a noun phrase translation module using web documents in order to compensate the insufficiencies in the bilingual dictionary of the MT product. With regard to the nonfactoid-type Japanese question-answering system, we proposed a method of non-factoid question-answering that can uniformly deal with any class of Japanese non-factoid question by using a large number of example Q&A pairs.