1. College of Environmental Technology, Muroran Institute of Technology, Mizumoto 27-1, Muroran, Hokkaido, Japan.
2. College of Design and Manufacturing Technology, Muroran Institute of Technology, Mizumoto 27-1, Muroran, Hokkaido, Japan.
3. Research and Development Department, TOBISHIMA CORPORATION, Kimagase 5472, Noda, Chiba, Japan.
4. Sales Engineering Division, Hilti Japan Ltd., Chigasakiminami 2-6-20, Tsuzuki-ku, Yokohama, Kanagawa, Japan.