1. Interdisciplinary Graduate School of Medicine and Engineering and Clean Energy Research Center, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan, Hitachi High-Technologies Corporation, 11-1 Ishikawa-cho, Hitachi-naka 312-0057, Japan, and Department of Electrical Engineering, Kogakuin University, Nakano-cho, Hachioji 192-0015, Japan