1. Polymer Science and Engineering Program, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemistry and School of Molecular Science (BK21), Active Polymer Center for Pattern Integration, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Applied Chemistry, Kumoh National Institute of Technology, Gumi 730-701, Korea and IT Convergence & Components Lab., Electronics and Telecommunications Research Institute, Daejeon 305-350, Korea