1. Department of Mechanical Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
2. Department of Electrical Engineering, Tokyo University of Science, Katsushika-ku, Tokyo 125-8585, Japan
3. Division of Energy and Environmental Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
4. Department of Liberal Arts (Physics), Tokyo University of Science, Katsushika-ku, Tokyo 125-8585, Japan