1. Hokkai Gakuen University, 1-1 Nishi 11-chome, Minami 26-jo, Chuo-ku, Sapporo, Hokkaido, Japan.
2. Public Works Research Institute, Civil Engineering Research Institute for Cold Region, 3-1-34 Ichi-jo, Hiragishi, Toyohira-ku, Sapporo, Hokkaido, Japan.
3. HRC Research Institute, 4-7 Tsukisamu-Chuo 7, Toyohira-ku, Sapporo, Hokkaido, Japan.
4. JIP Techno Science Corporation, 3-1 Kudan-minami 1, Chiyoda-ku, Tokyo, Japan.