1. Hoseo University, Department of Defense Science and Technology, 79-20 Hoseoro Babang-eup, Asan, Choongnam 336-795, Republic of Korea
2. Hoseo University, Department of Robotics Engineering, 79-20 Hoseoro Babang-eup, Asan, Choongnam 336-795, Republic of Korea
3. Korea Advanced Institute of Science and Technology, Department of Electrical Engineering, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea