1. Department of Systems and Control Engineering, School of Engineering, Tokyo Institute of Technology, Tokyo, Japan
2. Graduate School of Advanced Science and Engineering, Hiroshima University, Higashihiroshima, Japan
3. Department of Electrical Engineering and Bioscience, School of Advanced Science and Engineering, Faculty of Science and Engineering, Waseda University, Tokyo, Japan
4. Department of Electrical and Electronic Engineering, School of Engineering, University of Toyama, Toyama, Japan
5. Faculty of Economics and Business Administration, The University of Kitakyushu, Fukuoka, Japan
6. Graduate School of Economics, Kyoto University, Kyoto, Japan