1. info Powered Energy System Research Center, The University of Electro-Communications, Tokyo 182-8585, Japan
2. Department of Mechanical Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka 804-8550, Japan
3. Faculty of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
4. Department of Advanced Materials Science and Engineering, Faculty of Engineering Sciences, Kyushu University, Fukuoka 819-0395, Japan