1. Project Assistant Professor, Institute of Industrial Science, Univ. of Tokyo, Tokyo 113-8654, Japan (corresponding author).
2. Engineer, Shimizu Corporation, 2 Chome-16-1 Kyobashi, Chūō, Tokyo 104-0031, Japan.
3. Master Course Student, Institute of Industrial Science, Univ. of Tokyo, Tokyo 113-8654, Japan.
4. Associate Professor, Institute of Industrial Science, Univ. of Tokyo, Tokyo 113-8654, Japan.
5. Professor, Nagaoka Univ. of Technology, Nagaoka 940-2188, Japan.