1. Professor, Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan, Telephone: +81 58 293 2419, Telefax: +81 58 293 2419, E-mail: yashima@gifu-u.ac.jp
2. Assistant Professor, Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan, Telephone: +81 58 293 2462, Telefax: +81 58 293 2462, E-mail: s_tsuji@gifu-u.ac.jp
3. Chief, Tokyo Sales Department, Maeda Kosen Co. Ltd, Hisamatsu-cho 9-9, Nihonbashi, Chuo-ku, Tokyo, 103-0005, Japan, Telephone: +81 3 3663 7897, Telefax: +81 3 3663 9930, E-mail: k_yoshida@mdk.co.jp
4. General Manager Corporate Officer, Development Product Department and Engineering Department, Maeda Kosen Co. Ltd, Hisamatsu-cho 9-9, Nihonbashi, Chuo-ku, Tokyo, 103-0005, Japan, Telephone: +81 3 3663 7897, Telefax: +81 3 3663 9930, E-mail: yokota@mdk.co.jp