1. Shinshu University, Tokida 3-15-1, Ueda-shi, Nagano-ken 386-8567, Japan
2. Mitsubishi Rayon Co., 10-1, Daikoku-cho, Tsurumi-ku, Yokohama 230-0053, Japan
3. Graduate School of Engineering, Kyoto University - Katsura, Nishikyo-ku, Kyoto, Kyoto 615-8530, Japan