1. Department of Systems and Applied Mathematics Kunming University of Science and Technology Kunming China
2. School of Mechanical and Mechatronic Engineering University of Technology Sydney Broadway Ultimo New South Wales Australia
3. College of Mathematics and Computer Science Changsha University Changsha China
4. School of Mathematics and Statistics Changsha University of Science and Technology Changsha China
5. Department of Information Technology Hunan Women's University Changsha China