Affiliation: | a Research and Development Center, Stanley Electric Corporation, 1-3-1 Eda-nishi, Aoba-ku, Yokohama 225-0014, Japan b Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan c Frontier Collaborative Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan |