Christwardana, Marcelinus, Graduate School of Energy and Environment, Department of New Energy Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811 Center of Biomass and Renewable Energy (C-BIORE), Department of Chemical Engineering, Diponegoro University, Jl Prof. H. Soedarto, SH, Tembalang, Semarang 50275, Indonesia, Korea, Democratic People's Republic of