1. Department of Mathematics, Harbin University of Science and Technology, Harbin, China
2. School of Engineering, University of South Wales, Pontypridd, UK
3. School of Measurement and Communication, Harbin University of Science and Technology, Harbin, China
4. The Higher Educational Key Laboratory for Measuring & Control Technology and Instrumentations of Heilongjiang Province, Harbin University of Science and Technology, Harbin, China