1. Intellectual Textile System Research Center (ITRC) and School of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim9dong 56-1, Kwanakgu, Seoul, Korea 151-744, Department of Polymer Science and Technology, Inha University, Yonghyun4dong, Namku, Inchon, Korea, 402-751, and Hybrid Materials Research Center, Korea Institute of Science and Technology, Hawolgokdong 391-1, Sungbukku, Seoul, Korea 136-701