1. Professor of Civil Engineering and Director, International Centre for Urban Safety Engineering, Institute of Industrial Science, Univ. of Tokyo, Meguro Ku 4-6-1, Tokyo.
2. Professor of Civil and Environmental Engineering, Faculty of Engineering, Saitama Univ., Saitama-shi, Shimo-ohkubo 255, Saitama.
3. Assistant Professor of Civil Engineering, Shibaura Institute of Technology, Minato-ku Shibaura 3-9-14, Tokyo.
4. Associate Professor, Dept. of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur-208 016, India.