[1] Dept. of Production Engineering, Building Research Institute, Tachihara-1, Tsukuba, Ibaraki 305-0802, Japan
[2] International Cooperation, Ctr. of Eng. Education Development, Toyohashi Univ. of Technology, 1-1 Hibari-gaoka, Tempaku, Toyohashi, Aichi 441-8580, Japan
[3] Dept. of Architecture, Chiba Univ., Yayoi, Inage, Chiba 263-0022, Japan