1. Cutting Tool R&D Division, Kyocera Corporation, Kagoshima Sendai Plant, 1810 Taki-cho, Satsumasendai, Kagoshima 895-0292, Japan
2. Department of Chemical Engineering, Hiroshima University, 1-4-1 Kagamiyama, Hiroshima 739-8527, Japan
3. Department of Physics, Institute of Technology Bandung, Ganesha 10, Bandung 40132, West Java, Indonesia