1. Associate Professor, Dept. of Architecture, Seoul National Univ., San 56-1, Shinlim-Dong, Kwanak-Gu, Seoul 151-744, South Korea. E-mail: parkhg@snu.ac.kr
2. Senior Researcher, Research Institute of Industrial Science and Technology, 79-5, Yongcheon, Dongtan, Hwasung, Kyungi-do 445-810, South Korea. E-mail: macraian@snu.ac.kr