Yasushi Ogawa

2003

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

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.

2002

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

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

2001

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

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

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

2000

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

Pseudo-frequency method: an efficient document ranking retrieval method for n-gram indexing.

SIGIR 2000: Proceedings of the 23rd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, July 24-28, 2000, Athens, Greece

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

1999

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

SIGIR Forum 1999 Volume 33 Issue 1

Overlapping statistical segmentation for effective indexing of Japanese text.

Yasushi Ogawa|Toru Matsuda

Information Processing and Management 1999 Volume 35 Issue 4

NTCIR Advisor Report.

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

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

1998

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

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

1995

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)

1993

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