1. Ceramic Physics Laboratory; Kyoto Institute of Technology; Matsugasaki Sakyo-ku Kyoto 606-8585 Japan
2. Department of Advanced Fibro-Science; Kyoto Institute of Technology; Matsugasaki Sakyo-ku Kyoto 606-8585 Japan
3. Department of Mechanical and System Engineering; Kyoto Institute of Technology; Matsugasaki Sakyo-ku Kyoto 606-8585 Japan