1. Senior Researcher, Construction Safety Research Group, National Institute of Industrial Safety (NIIS), 1-4-6 Umezono, Kiyose, Tokyo 204-0024, Japan.
2. Associate Professor, Dept. of Civil Engineering, Faculty of Engineering, Musashi Institute of Technology, 1-28-1 Tamazutsumi, Setagaya-ku, Tokyo 158-8557, Japan.
3. Professor, Dept. of Civil Engineering, Faculty of Engineering, Musashi Institute of Technology, 1-28-1 Tamazutsumi, Setagaya-ku, Tokyo 158-8557, Japan.