1. Senior Research Engineer, Dept. of Production Engineering, Building Research Institute, Tachihara-1, Tsukuba, Ibaraki 305-0802, Japan.
2. Associate Professor, International Cooperation Center of Engineering Education Development, Toyohashi Univ. of Technology, 1-1 Hibarigaoka, Tempaku, Toyohashi, Aichi 441-8580, Japan.
3. Professor, Dept. of Architecture, Chiba Univ., Yayoi, Inage, Chiba 263-0022, Japan.