1. Advanced Engineering Course, National Institute of Technology, Ariake College, Omuta 836-8585, Fukuoka, Japan
2. Architecture Course, National Institute of Technology, Ariake College, Omuta 836-8585, Fukuoka, Japan
3. Department of Architecture and Civil Engineering, National Institute of Technology, Kumamoto College, Koshi 861-1102, Kumamoto, Japan
4. Former Professor, Kumamoto University, Kumamoto 860-8555, Kumamoto, Japan