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, Republic of Korea 151-744, Department of Polymer Science and Technology, Inha University, Yonghyun4dong, Namku, Inchon, Republic of Korea, 402-751, and School of Advanced Materials Engineering, Kookmin University, Chongnungdong, Sungbukku, Seoul, Republic of Korea 133-791