1. School of Electronic Engineering, Kumoh National Institute of Technology, Gumi-si, Gyeongbuk, Republic of Korea
2. Department of Computer Science and Engineering, Seoul National University of Science and Technology (SEOULTECH), Nowon-gu, Seoul, Republic of Korea
3. Mobility Robot Research Division, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Republic of Korea