1. a Department of Chemistry , College of Natural Science, Changwon National University , Changwon, Kyungnam , 641-773 , Korea
2. b Department of Chemistry-Biology , College of Natural Science, Kyungnam University , Masan, Kyungnam , 631-701 , Korea
3. c Department of Physics , College of Natural Science, Changwon National University , Changwon, Kyungnam , 641-773 , Korea
4. d Department of Polymer Physics , National Institute of Materials and Chemical Research , 1-1 Higashi, Tsukuba, Ibaraki , 305-8565 , Japan