1. School of Chemical and Biological Engineering; Institute of Chemical Processes; Seoul National University; 1, Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea
2. Department of Energy and Materials Engineering; Dongguk University-Seoul; 26 Pil-dong, 3 ga Jung-gu Seoul 100-715 Republic of Korea
3. Department of Physics; Pukyong National University; Busan 48513 Republic of Korea