College of Computer Science and Technology, Jilin University, Changchun, China.|Department of Mathematics and Statistics, South Dakota State University, Brookings, SD, USA.|Department of Mathematics and Statistics, South Dakota State University, Brookings, SD, USA.|Department of Agronomy, Horticulture and Plant Science, South Dakota State University, Brookings, SD, USA.|Center for Computational Biology and Bioinformatics and Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA.|Department of Mathematics and Statistics, South Dakota State University, Brookings, SD, USA.