1. Department of Chemical Engineering, Kyoto University - Katsura, Nishikyo-ku, Kyoto, Kyoto 615-8510, Japan
2. Shinshu University, Tokida 3-15-1, Ueda-shi, Nagano-ken 386-8567, Japan
3. Mitsubishi Rayon Co., 10-1, Daikoku-cho, Tsurumi-ku, Yokohama, 230-0053, Japan