1. Graduate Student, Harbin Institute of Technology, Heilongjiang 150001, People’s Republic of China.
2. Lecturer, Harbin Institute of Technology, Heilongjiang 150001, People’s Republic of China (corresponding author).
3. Professor, Harbin Institute of Technology, Heilongjiang 150001, People’s Republic of China.
4. Professor, Univ. of Glamorgan, Pontypridd CF37 1DL, U.K., and Professor, Victoria Univ., Melbourne 8001, Australia.