1. a Department of Electronics and Computer Science , Faculty of Science and Engineering, Science University of Tokyo in Yamaguchi , 1-1-1 Daigaku-Dori, Onoda, Yamaguchi , 756 , Japan
2. b Division of Electronic and Information Engineering , Graduate School of Technology, Tokyo University of Agriculture & Technology , 2-24-16 Nakamachi, Koganei, Tokyo , 184 , Japan
3. c Dainippon Ink & Chemicals, Inc. , 4472-1 Komuro, ha-machi, Kitaadachi-gun, Saitama , 362 , Japan