1. Department of Mechanical
Engineering, College of Science and Engineering, Ritsumeikan University, 1-1-1, Nojihigashi, Kusatsu, Shiga 525-8577, Japan
2. Kagami Memorial Institute for Materials
Science and Technology, Waseda University, 2-8-26, Nishi-waseda, Shinjuku-ku, Tokyo 169-0051, Japan