Koji EGUCHI

	Address:	2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
	Fax:	(+81)3-3556-1916
	E-mail:	eguchi (at) nii.ac.jp

• Research Interests:
  • Statistical Models for Information Retrieval:
    • Web Information Retrieval using Term Dependence Models
    • Sentiment Retrieval    (see also `Opinion Mining / Retrieval')
  • Opinion Mining / Retrieval:
    • Sentiment Retrieval    (see also `Statistical Models for Information Retrieval')
    • Interactive Clustering - Sentiment/Genre Clustering    (see also `Interactive Clustering / Retrieval')
    • Book Review Portal
  • Interactive Clustering / Retrieval:
    • Interactive Clustering - Sentiment/Genre Clustering    (see also `Opinion Mining / Retrieval')
    • Query-biased Document Clustering
    • Cluster-based Relevance Feedback (and others)
  • Text Summarization:
    • Subjectivity Summarization
    • Text Summarization using Stylistic Features
  • Evaluation Methodologies for Information Retrieval Systems:
    • Topic Difficulty Analysis in Information Retrieval
    • Evaluation Methodologies for Web Information Access Systems (cf., NTCIR-WEB)
    • Evaluation Methodologies for Mono-/Cross-lingual Information Retrieval Systems

• Selected Publications (Only papers written in English are listed.):
  • Web Information Retrieval using Term Dependence Models

    Koji Eguchi and W. Bruce Croft:

    ``Boosting Relevance Model Performance with Query Term Dependence'',

    Proceedings of the 15th ACM Conference on Information and Knowledge Management (CIKM 2006), Arlington, Virginia, USA, pp.792-793 (to appear in Nov. 2006). [pdf]

    Koji Eguchi and W. Bruce Croft,

    ``Query Structuring with Two-stage Term Dependence in the Japanese Language'',

    In Hwee Tou Ng, Mun-Kew Leong, Min-Yen Kan and Donghong Ji (eds.), Information Retrieval Technology: Third Asia Information Retrieval Symposium, Singapore, Lecture Notes in Computer Science, Vol.4182, pp.522-529, Springer, Berlin Heidelberg, Germany (Oct. 2006). ISBN 3-540-45780-0. [pdf] [further information]

    Koji Eguchi:

    ``NTCIR-5 Query Expansion Experiments using Term Dependence Models'',

    Proceedings of the Fifth NTCIR Workshop Meeting on Evaluation of Information Access Technologies: Information Retrieval, Question Answering and Cross-Lingual Information Access, Tokyo, Japan (Dec 2005). [pdf]

  • Sentiment Retrieval

    Koji Eguchi and Chirag Shah,

    ``Opinion Retrieval Experiments using Generative Models (Notebook Version)'',

    TREC 2006 Conference Notebook, Gaithersburg, Maryland, USA (to appear in Nov. 2006). [Selected as a speaker]

    Koji Eguchi and Victor Lavrenko:

    ``Sentiment Retrieval using Generative Models'',

    Proceedings of the 2006 Conference on Empirical Methods in Natural Language Processing (EMNLP 2006), Sydney, Australia, pp.345-354 (Jul 2006). [pdf] [pdf at ACL Anthology]

  • Interactive Clustering - Sentiment/Genre Clustering

    Ron Bekkerman, Hema Raghavan, James Allan, and Koji Eguchi,

    ``Interactive Clustering of Text Collections According to a User-Specified Criterion'',

    The 20th International Joint Conference on Artificial Intelligence (IJCAI-07), Hyderabad, India (to appear in Jan. 2007). [pdf]

    Ron Bekkerman, Koji Eguchi, and James Allan,

    ``Unsupervised Non-topical Classification of Documents'',

    UMass CIIR Technical Report, No.IR-472 (to appear in Nov. 2006). [pdf]

  • Book Review Portal

    Koji Eguchi and Shigeki Sugita:

    ``Automatically Editing Book Reviews on the Web'',

    Proceedings of the 3rd International Workshop on Web Information and Data Management (WIDM'01), Atlanta, Georgia, USA, pp.76-81 (Nov. 2001). [postscript(gz)] [pdf]

  • Query-biased Document Clustering

    Koji Eguchi, Hidetaka Ito, Akira Kumamoto, and Yakichi Kanata:

    ``Adaptive Document Clustering Using Incrementally Expanded Queries'', Systems and Computers in Japan, Vol.32, No.2, pp.64-74, Scripta Technica (Feb. 2001). [abstract]

    Koji Eguchi:

    ``Adaptive Cluster-based Browsing using Incrementally Expanded Queries and Its Effects'' (abstract),

    Proceedings of the 22nd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (ACM-SIGIR'99), Berkeley, California, USA, pp.265-266 (Aug. 1999). [postscript(gz)]

  • Cluster-based Relevance Feedback (and others)

    Koji Eguchi:

    ``Incremental Query Expansion Using Local Information of Clusters'',

    Proceedings of the 4th World Multiconference on Systemics, Cybernetics and Informatics (SCI 2000), Vol.2, Orlando, Florida, USA, pp.310-316 (Jul. 2000). [postscript(gz)]

    Koji Eguchi, Hidetaka Ito, Akira Kumamoto, and Yakichi Kanata:

    ``Adaptive Query Expansion Based on Clustering Search Results'',

    Transactions of Information Processing Society of Japan, Vol.40, No.5, pp.2439-2449 (May 1999). [postscript(gz)] [pdf]

    Koji Eguchi, Hidetaka Ito, Akira Kumamoto, and Yakichi Kanata:

    ``Adaptive and Incremental Query Expansion for Cluster-based Browsing'',

    Proceedings of the 6th International Conference on Database Systems for Advanced Applications (DASFAA'99), Hsinchu, Taiwan, pp.25-34 (Apr. 1999). [postscript(gz)]

    Koji Eguchi, Hidetaka Ito, and Akira Kumamoto:

    ``Information Retrieval Considering Adaptation to User's Behaviors on the WWW'',

    Proceedings of the 2nd International Workshop on Information Retrieval with Asian Languages (IRAL'97), Tsukuba, Japan, pp.108-113 (Oct. 1997). [postscript(gz)]

  • Subjectivity Summarization

    Yohei Seki, Koji Eguchi, Noriko Kando, and Masaki Aono:

    ``Opinion-focused Summarization and its Analysis at DUC 2006''

    Proceedings of the Document Understanding Conference 2006 (DUC 2006), New York City, New York, USA, pp.122-130 (Jun. 2006). [pdf]

    Yohei Seki, Koji Eguchi, Noriko Kando, and Masaki Aono:

    ``Multi-Document Summarization Reflecting Information Needs on Subjectivity'',

    Proceedings of the Fifth NTCIR Workshop Meeting on Evaluation of Information Access Technologies: Information Retrieval, Question Answering and Cross-Lingual Information Access, Tokyo, Japan, pp.521-528 (Dec. 2005). [pdf]

    Yohei Seki, Koji Eguchi, Noriko Kando, and Masaki Aono:

    ``Multi-Document Summarization with Subjectivity Analysis at DUC 2005''

    Proceedings of the Document Understanding Conference 2005 (DUC 2005), Vancouver, B.C., Canada, pp.119-126, (Oct. 2005). [pdf]

  • Text Summarization using Stylistic Features

    Yohei Seki, Koji Eguchi, and Noriko Kando:

    ``Multi-Document Viewpoint Summarization Focused on Facts, Opinion and Knowledge'',

    In James G. Shanahan, Yan Qu, Janyce Wiebe (eds.), Computing Attitude and Affect in Text: Theory and Applications, Springer, Dordrecht, The Netherlands (Dec. 2005). [further information]

    Yohei Seki, Koji Eguchi, and Noriko Kando:

    ``User-focused Multi-document Summarization with Paragraph Clustering and Sentence-type Filtering'',

    Proceedings of the Fourth NTCIR Workshop on Research in Information Access Technologies: Information Retrieval, Question Answering and Summarization, Tokyo, Japan (Jun. 2004). [pdf]

    Yohei Seki, Koji Eguchi, and Noriko Kando:

    ``Analysis of Multi-Document Viewpoint Summarization Using Multi-Dimensional Genres'',

    Proceedings of AAAI Spring Symposium on Exploring Attitude and Affect in Text, AAAI Technical Report SS-04-07, AAAI Press, Menlo Park, California, USA, pp. 142-145 (Mar. 2004). [further information]

    Yohei Seki, Koji Eguchi, and Noriko Kando:

    ``Compact Summarization for Mobile Phones'',

    In Fabio Crestani, Mark D. Dunlop, Stefano Mizzaro (eds.), Mobile and Ubiquitous Information Access, Lecture Notes in Computer Science, Vol.2954, pp.172-186, Springer-Verlag (Jan. 2004). ISBN 3-540-21003-2. [further information]

  • Topic Difficulty Analysis in Information Retrieval

    Kazuaki Kishida, Kazuko Kuriyama, Noriko Kando, and Koji Eguchi:

    ``Prediction of Performance on Cross-lingual Information Retrieval by Regression Models'',

    Proceedings of the Fourth NTCIR Workshop on Research in Information Access Technologies: Information Retrieval, Question Answering and Summarization, Tokyo, Japan (Jun. 2004).

    Koji Eguchi, Kazuko Kuriyama, and Noriko Kando:

    ``Sensitivity of IR Systems Evaluation to Topic Difficulty'',

    Proceedings of the 3rd International Conference on Language Resources and Evaluation (LREC 2002), Vol.2, Las Palmas de Gran Canaria, Spain, pp.585-589 (May 2002). [postscript(gz)] [pdf]

    Koji Eguchi, Kazuko Kuriyama, and Noriko Kando:

    ``Analysis of the Topic Difficulty for NTCIR (NACSIS Test Collection for Information Retrieval Systems)'',

    Proceedings of the 3rd International Conference of Asian Digital Library (ICADL 2000), Seoul, Korea, pp.231-238 (Dec. 2000). [postscript(gz)] [pdf]

  • Evaluation Methodologies for Web Information Access Systems (cf., NTCIR-WEB)

    Koji Eguchi, Keizo Oyama, Akiko Aizawa, and Haruko Ishikawa:

    ``Overview of WEB Task at the Fourth NTCIR Workshop'',

    Proceedings of the Fourth NTCIR Workshop on Research in Information Access Technologies: Information Retrieval, Question Answering and Summarization, Tokyo, Japan (Jun. 2004).

    Koji Eguchi, Keizo Oyama, Emi Ishida, Noriko Kando, and Kazuko Kuriyama:

    ``An Evaluation of the Web Retrieval Task at the Third NTCIR Workshop'',

    ACM SIGIR Forum, Vol.38, No.1, pp.39-45 (Jun. 2004). [pdf]

    Koji Eguchi, Keizo Oyama, Emi Ishida, Noriko Kando, and Kazuko Kuriyama:

    ``Evaluation Methods for Web Retrieval Tasks Considering Hyperlink Structure'',

    IEICE Transactions on Information and Systems, Vol.E86-D, No.9, pp.1804-1813 (Sep. 2003). [abstract] [pdf]

    Koji Eguchi, Keizo Oyama, Emi Ishida, Noriko Kando, and Kazuko Kuriyama:

    ``System Evaluation Methods for Web Retrieval Tasks Considering Hyperlink Structure'' (abstract),

    The 12th International World Wide Web Conference (WWW2003), No.poster-344, Budapest, Hungary (May 2003). [abstract]

    Koji Eguchi, Keizo Oyama, Emi Ishida, Noriko Kando, and Kazuko Kuriyama,

    ``Overview of the Web Retrieval Task at the Third NTCIR Workshop'',

    Proceedings of the Third NTCIR Workshop on Research in Information Retrieval, Automatic Text Summarization and Question Answering, Tokyo, Japan (Mar. 2003). [pdf]

    Koji Eguchi, Keizo Oyama, Emi Ishida, Kazuko Kuriyama, and Noriko Kando:

    ``The Web Retrieval Task and its Evaluation in the Third NTCIR Workshop'' (abstract),

    Proceedings of the 25nd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2002), Tampere, Finland, pp.375-376 (Aug. 2002). [postscript(gz)]

    Koji Eguchi, Keizo Oyama, Emi Ishida, Kazuko Kuriyama, and Noriko Kando:

    ``Evaluation Design of Web Retrieval Task in the Third NTCIR Workshop'' (abstract),

    The 11th International World Wide Web Conference (WWW2002), No.poster-22, Honolulu, Hawaii, USA (May 2002). [abstract]

  • Evaluation Methodologies for Mono-/Cross-lingual Information Retrieval Systems

    Kazuaki Kishida, Kuang-hua Chen, Sukhoon Lee, Kazuko Kuriyama, Noriko Kando, Hsin-Hsi Chen, Sung Hyon Myaeng, and Koji Eguchi:

    ``Overview of CLIR Task at the Fourth NTCIR Workshop'',

    Proceedings of the Fourth NTCIR Workshop on Research in Information Access Technologies: Information Retrieval, Question Answering and Summarization, Tokyo, Japan (Jun. 2004).

    Kazuaki Kishida, Kuang-hua Chen, Sukhoon Lee, Hsin-Hsi Chen, Noriko Kando, Kazuko Kuriyama, Sung Hyon Myaeng, and Koji Eguchi:

    ``Cross-Lingual Information Retrieval (CLIR) Task at the NTCIR Workshop 3'',

    ACM SIGIR Forum, Vol.38, No.1, pp.17-20 (Jun. 2004).

    Kuang-hua Chen, Hsin-Hsi Chen, Noriko Kando, Kazuko Kuriyama, Sukhoon Lee, Sung Hyon Myaeng, Kazuaki Kishida, Koji Eguchi, and Hyeon Kim:

    ``Overview of CLIR Task at the Third NTCIR Workshop'',

    Proceedings of the Third NTCIR Workshop on Research in Information Retrieval, Automatic Text Summarization and Question Answering, Tokyo, Japan (Mar. 2003).

    Kazuko Kuriyama, Noriko Kando, Toshihiko Nozue, and Koji Eguchi

    ``Pooling for a Large-Scale Test Collection : An Analysis of the Search Results from the First NTCIR Workshop'',

    Information Retrieval, Vol.5, No.1, pp.41-59, Kluwer Academic Publishers (Jan. 2002). [abstract]

    Noriko Kando, Kazuko Kuriyama, Toshihiko Nozue, Koji Eguchi, Hiroyuki Kato, Soichiro Hidaka, and Jun Adachi:

    ``The NTCIR Workshop: the First Evaluation Workshop on Japanese Text Retrieval and Cross-Lingual Information Retrieval'',

    Proceedings of the 4th International Workshop on Information Retrieval with Asian Languages (IRAL'99), Taipei, Taiwan, pp.Inv1-Inv7 (Nov. 1999).

    Noriko Kando, Kazuko Kuriyama, Toshihiko Nozue, Koji Eguchi, Hiroyuki Kato, and Soichiro Hidaka:

    ``Overview of IR Tasks at the First NTCIR Workshop'',

    Proceedings of the First NTCIR Workshop on Research in Japanese Text Retrieval and Term Recognition, Tokyo, Japan, pp.11-44 (Aug. 1999).