1. School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
2. The 4th (Energetics and Defense Materials) R&D Institute-3, Agency for Defense Development, Yuseong P.O. Box 35, Daejeon 305-600, Republic of Korea
3. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Dayton, Ohio 45433, United States
4. Department of Electrical, Computer & Energy Engineering, University of Colorado, Boulder, Colorado 80309, United States