1. Graduate School of Maritime Transportation System, Mokpo National Maritime University, 91, Haeyangdaehak-ro, Mokpo-si 58628, Jeollanam-do, Republic of Korea
2. Division of Navigation Science, Mokpo National Maritime University, 91, Haeyangdaehak-ro, Mokpo-si 58628, Jeollanam-do, Republic of Korea