1. National Creative Research Center for Block Copolymer Self-Assembly,
Department of Chemical Engineering, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
2. Department of Materials Chemistry
and Engineering, Japan Science and Technology Agency, ERATO, Takahara
Soft Interfaces Project, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
3. Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu,
Seoul 120-749, Korea