1. LMIB of the Ministry of Education, School of Mathematical Sciences Beihang University Beijing People's Republic of China
2. School of Mathematics and Statistics Beijing Jiaotong University Beijing People's Republic of China
3. Department of Applied Mathematics The Hong Kong Polytechnic University Kowloon Hong Kong
4. Center for Intelligent Multidimensional Data Analysis Science Park Shatin Hong Kong
5. Department of Electrical Engineering City University of Hong Kong Kowloon Hong Kong