1. Samsung Advanced Institute of Technology, San 14−1, Nong-Seo Ri, Ki-Hung Eub, Yong-In Gun, Kyung-Ki
Do 449-900, South Korea
2. Department of Chemistry and WCU Department of Biophysics and Chemical
Biology, Seoul National University, Seoul
151-747, South Korea
3. Department
of Physics, Dongguk University, Seoul 100-715,
South Korea