1. R&D Budget Coordination Division, Korea Institute of Science and Technology Evaluation and Planning (KISTEP), 11F Dongwon Industry Bldg, 275, Yangjae-dong, Seocho-gu, Seoul 137-130, South Korea
2. Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, South Korea
3. Department of Civil, Environmental & Architectural Engineering, Korea University, 1, 5-ka, Anam-dong, Sungbuk-gu, Seoul 136-713, South Korea