1. Department of Materials Science and Technology, Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka,
Niigata 940-2188, Japan
2. Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku,
Tokyo 152-8550, Japan
3. Department
of Mechanical Engineering, Gifu National College of Technology, Kamimakuwa 2236-2, Motosu, Gifu 501-0495, Japan