NTCIR-6 CLIR Experiments at Osaka Kyoiku University - Term Expansion Using Online Dictionaries and Weighting Score by Term Variety

This paper describes experimental results of J-J subtask of NTCIR-6 CLIR. We expanded query term using online dictionaries in a WEB. It was effective for some topics of which average precision was low. Probabilistic model were employed for scoring, and we modified this score multiplying by the number of varieties of query terms, also. In most cases this works well. Query term reduction should be considered if this modified scoring fails.