1. Center for Superfunctional Materials,
Department of Chemistry, Pohang University of Science and Technology,
San 31, Hyojadong, Namgu, Pohang 790-784, Korea
2. Department of Cellular Molecular
Medicine, College of Medicine, Chosun University, Gwangju 501-759,
Republic of Korea
3. Department
of Applied Chemistry,
School of Applied Sciences, Kyung Hee University, Kyungki-Do 446-701,
Korea