1. Department of Polymer Science and Engineering, Faculty of Textile Science, Kyoto Institute of Technology, Sakyo-ku, Kyoto 606
2. Tokyo Research Center, Central Glass, LTD., Imafuku-Nakadai, Kawagoe, Saitama 356
3. Department of Materials Science, Faculty of Engineering, Shizuoka University, Johoku, Hamamatsu, Shizuoka 432