1. Department of Statistics, Univ. of Georgia, Athens, GA, USA
2. Department of Mathematical Sciences, KAIST, Daejeon, The Republic of Korea
3. Department of Mathematics Education, Korea National Univ. of Education, Cheongju, The Republic of Korea
4. Department of Statistics, University of Seoul, Seoul, The Republic of Korea
5. Department of Mathematics, Ajou University, Suwon, The Republic of Korea
6. Graduate School, Department of Urban Big Data Convergence, University of Seoul, Seoul, The Republic of Korea