1. a School of Information and Mechatronics, Gwangju Institute of Science and Technology 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Korea
2. b Department of Mechanical Engineering, College of Industrial Technology, Nihon University, 1-2-1 Izumi-cho, Narashino-shi, Chiba 275-8575, Japan
3. c The 1st PGM R&D Center, Agency for Defense Development, Jochiwon-gil 462, Yuseong, Daejeon, 305-152, Korea;, Email: sehlee13@gmail.com