• Project Researcher, Department of Materials and Environmental Science, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan, September 2006 to December 2009 • Post-doctoral Researcher, Division of Advanced Chemical Technology, Korea Research Institute of Chemical Technology, Yuseoung, Daejeon 305-600, Korea, August 2004 to August 2005 • Post-doctoral Fellow, Lab of Environment and Energy, Department of Environmental and Chemical Engineering, Chonbuk National University, Chonju 561-756, South Korea, May 2003 to May 2004