Yasushi Ogawa


1993

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Simple Word Strings as Compound Keywords: An Indexing and Ranking Method for Japanese Texts
Yasushi Ogawa | Ayako Bessho | Masako Hirose
Proceedings of the 16th Annual International ACM-SIGIR Conference on Research and Development in Information Retrieval. Pittsburgh, PA, USA, June 27 - July 1, 1993

1995

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A New Character-based Indexing Organization using Frequency Data for Japanese Documents
Yasushi Ogawa | Masajiro Iwasaki
SIGIR'95, Proceedings of the 18th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval. Seattle, Washington, USA, July 9-13, 1995 (Special Issue of the SIGIR Forum)

1998

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Lessons from BMIR-J2: A Test Collection for Japanese IR Systems
Tsuyoshi Kitani | Yasushi Ogawa | Tetsuya Ishikawa | Haruo Kimoto | Ikuo Keshi | Jun Toyoura | Toshikazu Fukushima | Kunio Matsui | Yoshihiro Ueda | Tetsuya Sakai | Takenobu Tokunaga | Hiroshi Tsuruoka | Hidekazu Nakawatase | Teru Agata
SIGIR '98: Proceedings of the 21st Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, August 24-28 1998, Melbourne, Australia

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Optimizing Query Evaluation in n-gram Indexing
Yasushi Ogawa | Toru Matsuda
SIGIR '98: Proceedings of the 21st Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, August 24-28 1998, Melbourne, Australia

1999

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Structuring and expanding queries in the probabilistic model
Yasushi Ogawa | Hiroko Mano | Masumi Narita | Sakiko Honma
Proceedings of The Eighth Text REtrieval Conference, TREC 1999, Gaithersburg, Maryland, USA, November 17-19, 1999

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NTCIR Advisor Report
Yasushi Ogawa
Proceedings of the First NTCIR Workshop on Research in Japanese Text Retrieval and Term Recognition, NTCIR-1, Tokyo, Japan, August 30 - September 1, 1999

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BMIR-J2: A Test Collection for Evaluation of Japanese Information Retrieval Systems
Tetsuya Sakai | Tsuyoshi Kitani | Yasushi Ogawa | Tetsuya Ishikawa | Haruo Kimoto | Ikuo Keshi | Jun Toyoura | Toshikazu Fukushima | Kunio Matsui | Yoshihiro Ueda | Takenobu Tokunaga | Hiroshi Tsuruoka | Hidekazu Nakawatase | Teru Agata | Noriko Kando
1999 Volume 33 Issue 1

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Overlapping statistical segmentation for effective indexing of Japanese text
Yasushi Ogawa | Toru Matsuda
1999 Volume 35 Issue 4

2000

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Structuring and Expanding Queries in the Probabilistic Model
Yasushi Ogawa | Hiroko Mano | Masumi Narita | Sakiko Honma
Proceedings of The Ninth Text REtrieval Conference, TREC 2000, Gaithersburg, Maryland, USA, November 13-16, 2000

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The use of phrases from query texts in information retrieval
Masumi Narita | Yasushi Ogawa
SIGIR 2000: Proceedings of the 23rd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, July 24-28, 2000, Athens, Greece

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Pseudo-frequency method: an efficient document ranking retrieval method for n-gram indexing
Yasushi Ogawa
SIGIR 2000: Proceedings of the 23rd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, July 24-28, 2000, Athens, Greece

2001

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RICOH at TREC-10: Web Track Ad-hoc Task
Hideo Itoh | Hiroko Mano | Yasushi Ogawa
Proceedings of The Tenth Text REtrieval Conference, TREC 2001, Gaithersburg, Maryland, USA, November 13-16, 2001

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Selecting Expansion Terms in Automatic Query Expansion
Hiroko Mano | Yasushi Ogawa
SIGIR 2001: Proceedings of the 24th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, September 9-13, 2001, New Orleans, Louisiana, USA

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RICOH at NTCIR-2
Yasushi Ogawa | Hiroko Mano
Proceedings of the Third Second Workshop Meeting on Evaluation of Chinese & Japanese Text Retrieval and Text Summarization, NTCIR-2, Tokyo, Japan, March 7-9, 2001

2002

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Term Distillation for Cross-DB Retrieval
Hideo Itoh | Hiroko Mano | Yasushi Ogawa
Proceedings of the Third NTCIR Workshop on Research in Information Retrieval, Automatic Text Summarization and Question Answering, NTCIR-3, Tokyo, Japan, October 8-10, 2002

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University of Tokyo/RICOH at NTCIR-3 Web Retrieval Task
Masashi Toyoda | Masaru Kitsuregawa | Hiroko Mano | Hideo Itoh | Yasushi Ogawa
Proceedings of the Third NTCIR Workshop on Research in Information Retrieval, Automatic Text Summarization and Question Answering, NTCIR-3, Tokyo, Japan, October 8-10, 2002

2003

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Ricoh at CLEF 2003
Yuichi Kojima | Hideo Itoh | Hiroko Mano | Yasushi Ogawa
Working Notes for CLEF 2003 Workshop co-located with the 7th European Conference on Digital Libraries (ECDL 2003), Trondheim, Norway, August 21-22, 2003

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Ricoh at CLEF 2003
Yuichi Kojima | Hideo Itoh | Hiroko Mano | Yasushi Ogawa
Comparative Evaluation of Multilingual Information Access Systems, 4th Workshop of the Cross-Language Evaluation Forum, CLEF 2003, Trondheim, Norway, August 21-22, 2003, Revised Selected Papers