Homepage of Yoshiharu Ishikawa

Extraction of Mobility Statistics from Moving Object Trajectories (since 2003)

• Research Area: Spatio-temporal Databases
• Past Members: Yuichi Tsukamoto and Yoji Machida
• Selected Publications
1. Yoshiharu Ishikawa, Yuichi Tsukamoto, and Hiroyuki Kitagawa, "Extracting Mobility Statistics from Indexed Spatio-Temporal Datasets", Proc. 2nd Workshop on Spatio-Temporal Database Management (STDBM'04), Toronto, Canada, Aug. 2004.
2. Yoshiharu Ishikawa, Yoji Machida, and Hiroyuki Kitagawa, "A Dynamic Mobility Histogram Construction Method Based on Markov Chains", Proceedings of the 18th International Conference on Scientific and Statistical Database Management (SSDBM 2006), Vienna, Austria, pp. 359-368, July 2006.
3. Yoshiharu Ishikawa, Yoji Machida, and Hiroyuki Kitagawa, "A Dynamic Mobility Histogram Construction Method Based on Markov Chains", IEICE Transactions on Information and Systems (Japanese Edition), Vol. J90-D, No. 2, pp. 311-324, February 2007.
4. Yoshiharu Ishikawa, "Data Mining for Moving Object Databases", Laurence T. Yang (ed.), Mobile Intelligence: Mobile Computing and Computational Intelligence, John Wiley & Sons, 2010, Chapter 11. (to appear)

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Novelty-based Clustering of Online Documents (since 2000)

• Research Area: Information Retrieval, Digital Libraries
• Current Members: Sophoin Khy
• Past Members: Yibing Chen, Chiharu Kajinami, Yuya Sasaki, Mikine Hasegawa
• Selected Publications
1. Yoshiharu Ishikawa, Yibing Chen, and Hiroyuki Kitagawa, "An On-Line Document Clustering Method Based on Forgetting Factors", Proceedings of the 5th European Conference on Research and Advanced Technology for Digital Libraries (ECDL 2001), Vol. 2163 of Lecture Notes in Computer Science, pp. 332-339, Darmstadt, Germany, Springer-Verlag, September 2001.
2. Sophoin Khy, Yoshiharu Ishikawa, and Hiroyuki Kitagawa, "Novelty-based Incremental Document Clustering for On-line Documents", Proceedings of International Workshop on Challenges in Web Information Retrieval and Integration (WIRI 2006), Atlanta, Georgia, IEEE Computer Society Press, April 2006.
3. Yoshiharu Ishikawa and Mikine Hasegawa, "T-Scroll: Visualizing Trend of Time-series of Documents for Interactive User Exploration", Proceedings of 11th European Conference on Research and Advanced Technology for Digital Libraries (ECDL 2007), Vol. 4675 of Lecture Notes in Computer Science, pp. 235-246, Budapest, Hungary, September 2007.
4. Mikine Hasegawa and Yoshiharu Ishikawa, "T-Scroll: A Trend Visualization System Based on Clustering of a Time-series of Documents", IPSJ Transactions on Databases, Vol. 48, No. SIG 20(TOD 36), pp. 61-78, December 2007.
5. Sophoin Khy, Yoshiharu Ishikawa, and Hiroyuki Kitagawa, "A Novelty-based Clustering Method for On-line Documents", World Wide Web Journal, Vol. 11, No. 1, pp. 1-37, March 2008.
6. Sophoin Khy, Yoshiharu Ishikawa, and Hiroyuki Kitagawa,
   "A Query Language and Its Processing for Time-Series Document Clusters",
   Proceedings of the 11th International Conference on Asia-Pacific Digital Libraries (ICADL 2008), Vol. 5362 of Lecture Notes in Computer Science, pp. 82-92, Bali, Indonesia, December 2008.

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Integration of Web and Spatial Information / Database-oriented Web Mining (since 2004)

• Research Area: Web Mining, Text Mining, and Spatial Databases
• Current Members: Jianwei Zhang and Sayumi Kurokawa
• Selected Publications
1. Jianwei Zhang, Yoshiharu Ishikawa, and Hiroyuki Kitagawa, "Extended Link Analysis for Extracting Spatial Information Hubs", Proceedings of International Workshop on Challenges in Web Information Retrieval and Integration (WIRI 2005), pp. 17-22, Tokyo, Japan, IEEE Computer Society Press, April 2005.
2. Jianwei Zhang, Yoshiharu Ishikawa, Sayumi Kurokawa, and Hiroyuki Kitagawa, "LocalRank: Ranking Web Pages Considering Geographical Locality by Integrating Web and Databases", Proceedings of the 16th International Conference on Database and Expert Systems Applicatioins (DEXA 2005), Vol. 3588 of Lecture Notes in Computer Science, pp. 145-155, Copenhagen, Denmark, Springer-Verlag, August 2005.
3. Jianwei Zhang, Yoshiharu Ishikawa, Sayumi Kurokawa, and Hiroyuki Kitagawa, "LocalRank: A Prototype for Ranking Web Pages with Database Considering Geographical Locality", Proceedings of the Eighth Asia Pacific Web Conference (APWeb 2006), Vol. 3841 of Lecture Notes in Computer Science, pp. 1209-1213, Harbin, China, Springer-Verlag, January 2006. (demo)
4. Jianwei Zhang, Yoshiharu Ishikawa, and Hiroyuki Kitagawa, "Record Extraction Based on User Feedback and Document Selection",
   Proceedings of the Joint Conference of the 9th Asia-Pacific Web Conference and the 8th International Conference on Web-Age Information Management (APWeb/WAIM07), Vol. 4505 of Lecture Notes in Computer Science, pp. 574-585, Huang Shan (Yellow Mountains), China, June 2007.
5. Jianwei Zhang, Yoshiharu Ishikawa, and Hiroyuki Kitagawa, "Record Extraction from Large-scale Text Resources Considering Topics", IPSJ Transactions on Databases, Vol. 48, No. SIG 14(TOD 35), pp. 107-123, September 2007.

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Providing Traceability for Reliable P2P Data Exchange (since 2005)

• Research Area: P2P Computing, Integration of Distributed Heterogeneous Information
• Current Members: Fengrong Li and Takuya Iida
• Past Members: Yoshiyuki Nagamoto
• Selected Publications
  1. Fengrong Li and Yoshiharu Ishikawa, "Traceable P2P Record Exchange Based on Database Technologies", Proceedings of the 10th Asia Pacific Web Conference (APWeb 2008), Vol. 4976 of Lecture Notes in Computer Science, pp. 475-486, Shenyang, China, April 2008.
  2. Fengrong Li, Takuya Iida, and Yoshiharu Ishikawa, "Traceable P2P Record Exchange: A Database-Oriented Approach", Frontiers of Computer Science in China, Vol. 2, No. 3, pp. 257-267, September 2008.
  3. Fengrong Li, Takuya Iida, and Yoshiharu Ishikawa, "`Pay-as-you-go' Processing for Tracing Queries in a P2P Record Exchange System", Proceedings of the 14th International Conference on Database Systems for Advanced Applications (DASFAA 2009), Vol. 5463 of Lecture Notes in Computer Science, pp. 323-327, Brisbane, Australia, April 2009. (short paper)

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Development Adaptive Query Processing Technologies for Sensor Databases (since 2007)

• Research Area: Sensor Databases
• Project Homepage is here (under construction)
• Selected Publications
  1. Yoshiharu Ishikawa,
     "Data Mining for Moving Object Databases"
     Laurence T. Yang (ed.), Research in Mobile Intelligence, John Wiley & Sons, 2010, Chapter 11.
  2. Yoshiharu Ishikawa, Yuichi Iijima, and Jeffrey Xu Yu, "Spatial Range Querying for Gaussian-Based Imprecise Query Objects", Proceedings of the International Conference on Data Engineering (ICDE 2009), pp. 676-687, Shanghai, China, March-April 2009, IEEE Computer Society Press.
  3. Yuichi Iijima and Yoshiharu Ishikawa, "Finding Probabilistic Nearest Neighbors for Query Objects with Imprecise Locations", Proceedings of the 10th International Conference on Mobile Data Management (MDM 2009), pp. 52-61, Taipei, Taiwan, May 2009.
  4. Yoshiharu ishikawa,
     "Spatial Query Processing Based on Uncertain Location Information",
     6th International Workshop on Databases in Networked Information Systems (DNIS 2010), Vol. 5999 of Lecture Notes in Computer Science, pp. 311-316, Aizu, Fukushima, Japan, March 2010. (invited talk)