1. National Institute of TechnologyAsahikawa College 2-2-1-6 Shunkodai, Asahikawa Hokkaido 071-8142 Japan
2. Graduate School of Environmental ScienceHokkaido University, N10 W5, Kita, Sapporo Hokkaido 060-0810 Japan
3. School of Engineering ScienceOsaka University 1-3 Machikaneyama, Toyonaka Osaka 560-8531 Japan
4. Department of Materials Science and TechnologyFaculty of EngineeringNagaoka University of Technology 1603-1 Kamitomioka, Nagaoka Niigata 940-2188 Japan