1. Computer Science, George Mason University, Fairfax, VA 22030, USA
2. Department of Computer Engineering, Chungnam National University, Yuseong-gu, Daejeon 34134, Republic of Korea
3. Artificial Intelligence and Big Data Department, Endicott College, Woosong University, Daejeon 34606, Republic of Korea
4. Department of Information and Communication Engineering, Yeungnam University, Gyeongsan-si 38541, Gyeongsangbuk-do, Republic of Korea