松原靖子，櫻井保志，吉川正俊，隠れマルコフモデルに基づくストリーム処理，情報処理学会論文誌:データベース, 情報処理学会論文誌:データベース(TOD), Vol.4 No.4, pp. 48-62, 2011年12月．
Yasuko Matsubara, Yasushi Sakurai and Masatoshi Yoshikawa: “D-Search: An Efficient and Exact Search Algorithm for Large Distribution Sets”, Knowledge and Information Systems (KAIS), Springer, Vol.29, No.1, pp.131-157, October, 2011 (Invited to best papers of ICDM 2009 issue).
Jiyi Li, Qiang Ma, Yasuhito Asano, Masatoshi Yoshikawa, “Ranking Content-Based Social Images Search Results with Social Tags,” The Seventh Asia Information Retrieval Societies Conference (AIRS 2011), pp.147-156, Dubai, UAE, December 18-20, 2011.
Junpei Kawamoto and Masatoshi Yoshikawa, “Private Range Query by Perturbation and Matrix Based Encryption,” the Sixth International Conference on Digital Information Management (ICDIM 2011), pp.211-216, Melbourne, Australia, September, 2011. (Best paper)
Ling Xu, Qiang Ma, and Masatoshi Yoshikawa, “Credibility-Oriented Ranking of Multimedia News Based on a Material-Opinion Model,” The 12th International Conference on Web-Age Information Management (WAIM 2011), Wuhan, China, September 15, 2011.
Tetsutaro Motomura, Toshiyuki Shimizu, and Masatoshi Yoshikawa, “Alternative Query Generation for XML Keyword Search and Its Optimization,” 22nd International Conference on Database and Expert Systems Applications (DEXA 2011), Toulouse, France, August 30, 2011.
Kazuki Tawaramoto, Junpei Kawamoto, Yasuhito Asano, and Masatoshi Yoshikawa, “A Bipartite Graph Model and Mutually Reinforcing Analysis for Review Sites,” the 22nd International Conference on Database and Expert Systems Applications (DEXA 2011), Toulouse, France, August 31, 2011.
Ryo Aoto, Toshiyuki Shimizu, and Masatoshi Yoshikawa, “Propagation of Multi-granularity Annotations,” 22nd International Conference on Database and Expert Systems Applications (DEXA 2011), Toulouse, France, September 2, 2011.
Xinpeng Zhang, Yasuhito Asano, Masatoshi Yoshikawa, “Towards Improving Wikipedia as an Image-rich Encyclopaedia through Analyzing Appropriateness of Images for an Article”, The 13th Asia-Pacific Web Conference (APWeb)，Beijing, China, April 18-20, 2011.