1. Department of Mechanical Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
2. Department of Mechanical Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
3. Department of Mechanical Engineering and Metallurgy, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
4. Tire Technical Center, Toyo Tire Corporation, 2-13, Fujinoki 2-chome, Itami City, Hyogo 664-0847, Japan