1. Faculty of Science and Technology, Ryukoku University, 1-5 Yokotani, Setaoe-cho, Otsu 520-2194, Japan
2. Graduate School of Science and Technology, Ryukoku University, 1-5 Yokotani, Setaoe-cho, Otsu 520-2194, Japan
3. De Nora Permelec Ltd, 24-6 Higashitakasaki, Tamamo 706-0134, Japan