[1
]Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook
National University, Daegu 700-422, South Korea
[2
]Molecular
Imaging Research Center, Korea Institute of Radiological and Medical Sciences,
Seoul 139-706, South Korea
[3
]Department
of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science &
Technology, Daegu 711-873, South Korea
[4
]Western Seoul Center, Korea Basic Science Institute, Seoul 120-140, Korea