1. Department of Materials Processing Graduate School of Engineering Tohoku University Aoba-yama 6-6-02 Sendai 980-8579 Japan
2. Department of Mechanical Systems Engineering College of Engineering Ibaraki University Nakanarusawa-cho 4-12-1 Hitachi 316-8511 Japan
3. Department of Frontier Sciences for Advanced Environment Graduate School of Environmental Studies Tohoku University Aoba-yama 6-6-02 Sendai 980-8579 Japan