Affiliation: | a Research Institute of Energy and Resources, Seoul National University, San 56-1, Shinlimdong, Kwanakgu, Seoul 151-742, Republic of Korea b School of Civil, Urban and Geosystem Engineering, Seoul National University, San 56-1, Shinlimdong, Kwanakgu, Seoul 151-742, Republic of Korea c Korea National Oil Corporation, 1588-14, Gwanyang-dong, Dongan-gu, Anyang, Gyeonggi-do, 431-711, Republic of Korea |