Keiichiro Fukazawa, Kyoto University, Kyoto, Japan, Tomoki Kimura, Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai, Japan, Terumasa Tokunaga, 6., Department of Systems Design and Informatics, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Kawasaki-City, Kanag, Japan and Shinya Nakano, The Inst of Statistical Math, Tachikawa, Japan