xxiii Acknowledgment I would like to thank the chapters' authors. It is them that make the book a reality. I would also like to take this opportunity to thank the National Natural Science Foundation of China and the Suzhou Science and Technology Bureau for their supports under Grant Number 60975080 and SYJG0919, respectively. Finally, I am grateful to the team at IGI Global Publishers who worked diligently with me throughout the process of editing and production. Working with Heather Probst, Jamie Wilson, and Jan Travers has been a pleasure and a learning experience. Yuhui Shi Xi'an Jiaotong-Liverpool University, China December 30, 2011