Add to ORKGSincere gratitude is expressed to my supervising professor Dr. Wei-Jen Lee, who has been so generous with his time in support, guidance, patience, and advice throughout the thesis and research. Without his guidance and patience, the thesis would not be finished. It is my honor to be his student and get sources of knowledge and inspiration from him over the past two years. His virtue of diligence, enthusiastic, patience and perseverance is to be greatly admired in my life. Besides, I would express particular gratitude to Dr.Rasool Kenarangui and Dr. Kai Yeung for their instruction, serving on my thesis committee, valuable suggestions and reviewing my thesis. Finally, but not the least, I would dedicate my thesis to my parents, parents-in-law...