1. Department of Mathematics, Pusan National University, Busan 46241, Republic of Korea
2. Department of Cogno-Mechatronics, Pusan National University, Busan 46241, Republic of Korea
3. School of Allied Health Sciences, Griffith University, Gold Coast, Australia
4. Finance Fishery Manufacture Industrial Mathematics Center on Big Data, Pusan National University, Busan 46241, Republic of Korea