1. Department of Mechanical Engineering Korea Advanced Institute of Science and Technology 291 Daehak‐ro, Yuseong‐gu Daejeon 34141 South Korea
2. The 7th R&D Institute 3rd Directorate Agency for Defense Development Yuseong P.O. Box 35 Daejeon 34186 South Korea
3. Department of Material Science and Engineering UCLA 420 Westwood Plaza Los Angeles CA 90095 USA