1. Hirao Active Glass Project, ERATO, JST, Keihanna-Plaza, 2-6 Hikari-dai, Seika-cho, Kyoto 619-0237
2. Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502
3. Central Research Labs., Matsushita Electric Industrial Co., Ltd., Seika-cho, Kyoto 619-0237
4. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501