1. Department of Automation, BNRist, Tsinghua University, Beijing, China
2. Department of Computer Science, Brunel University London, Uxbridge, U.K.
3. Department of Mathematics, Heilongjiang Provincial Key Laboratory of Optimization Control and Intelligent Analysis for Complex Systems, Harbin University of Science and Technology, Harbin, China
4. Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, U.K.