1. School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea; School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technology, Gumi 730-701, Republic of Korea; Hyperstructured Organic Materials Research Center and School of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea; and Pohang Accelerator Laboratory, Pohang 790-784, Republic of Korea