筑波大学大学院ビジネス科学研究科;
九州工業大学情報工学部電子情報工学科;
KDDI研究所Graduate School of Business Science, University of Tsukuba,Otsuka 3-29-1, Bunkyo, Tokyo 112-0012Department of Computer Science and Electronics Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680-4, Kawazu, Iizuka, Fukuoka, 820-8502, JapanKDDI R&D Laboratories Inc.2-1-15 Ohara, Kamifukuoka, Saitama, 356-8502 Japan;