1. Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, Aichi 456-8587, Japan
2. Advanced Material Engineering Division, Toyota Motor Corporation, Susono, Shizuoka 410-1193, Japan
3. Office of Society-Academia Collaboration for Innovation, Kyoto University, Uji, Kyoto 611-0011, Japan
4. Innovative Research Excellence, Honda R&D Co., Ltd., Haga, Tochigi 321-3393, Japan
5. Institute of Engineering Innovation, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
6. Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan