1. Department of Computer Science, Dongshin University, Naju, Chonnam, Korea
2. Department of Children Welfare, Woosuk University, Wanju-gun, Jeonbuk, Korea
3. Department of Statistics and Information Science, Dongguk University, Gyeongju, Gyeongbuk, Korea
4. Statistics Discipline, Division of Science and Mathematics, University of Minnesota – Morris, Morris, MN, USA