ACKNOWLEDGEMENT
Sincere thanks are due to all people who have directly or indirectly influenced and contributed to my research. The thesis fund was supported by The 90th Anniversary of Chulalongkorn University Fund (Ratchadaphiseksomphot Endownment Fund) and Integrated Innovation Academic Center: IIAC Chulalongkorn University Centenary Academic Development Project (CU56-AS06). The researcher is especially indebted to Assistance Professor Dr. Sujitra Boonyong, Associate Profesor Dr. Sompoch Iamsupasit, Assistance Professor Dr. Nitima Purepong and Dr.Surasak Bamrungwong for their valuable advice, and measurement tools supportive. This publication was possible with partial support provided by the funds made available under the Higher Education Research Promotion and National Research University Project of Thailand, office of the Higher Education Commission (Project no. AS1148A-55).