1. School of Materials Science and Engineering
2. Gwangju Institute of Science and Technology
3. Gwangju 61005
4. Republic of Korea
5. Research Division for Industry & Environment
6. Department of Biologic and Materials Science
7. University of Michigan
8. Ann Arbor
9. USA
10. Advanced Radiation Technology Institute
11. Korea Atomic Energy Research Institute (KAERI)
12. Jeongeup