1. School
of Integrated Design Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama-shi, Kanagawa-ken 223-8522, Japan
2. Department
of Advanced Ceramic Material Engineering, Gangneung-Wonju National University, 7 Jukheon-gil, Gangneung, Gangwon-do 210-702, Korea