1. Department
of Chemical and Biological Engineering, Hanbat National University, 125, Dongseo-daero, Yuseong-gu, Daejeon 305-719, Republic of Korea
2. Intelligent Polymer Research Institute, ARC Centre of Excellence
for Electromaterials Science, AIIM Facility, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
3. Division of Advanced
Materials Engineering, Kongju National University, 275, Budae-dong, Cheonan, Chungnam 331-717, Republic of Korea