Institution: | a Department of Material and Lifescience, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan b The Univ. of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan c Nara National College of Technology, 22 Yatamachi, Yamatokoriyama, Nara 639-1080, Japan |