1. School
of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Republic of Korea
2. Department
of Biomedical Engineering, Yonsei University, Wonju 220-740, Republic of Korea
3. Department
of Radiology, YUMS-KRIBB Medical Convergence Center,
College of Medicine, Yonsei University, Seoul 120-752, Republic of Korea
4. Nanomedical
National Core Research Center, Yonsei University, Seoul 120-749, Republic of Korea
5. Department
of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Republic of Korea