ACKNOWLEDGEMENTS
I wish to express my gratitude to all those who have given me assistance, help and
support during the completion of my Ph.D. in Division of Spatial and Information
Science (SIS), Graduate School of Life and Environment Sciences, University of
Tsukuba, Japan.
Foremost, I would like to express my deep and sincere gratitude to my academic
advisor, Prof. Yuji Murayama, for his continuous support to successfully completing my
thesis, and for his kind assistance, insightful comments and knowledge that added
considerably to my academic experience. I appreciate for his assistance in this matter.
My research would not have succeeded without his helps and support.
Equally, I would like to express my sincere gratitude to my thesis committee members,
Prof. Tabayashi Akira, Prof. Kiyomi Yamashita, Prof. Masaaki Kureha, and Assist.
Prof. Takehiro Morimoto for their encouragement and assistance they provided during
the thesis period. I am very grateful for support and cooperation of my thesis committee.
In addition, I would like to thank Dr. Rajesh Buhadur Thapa, Dr. Ko Ko Lwin, and
Mr. Estoque Ronald C. for taking time to guide us to streamline our theses since the
beginning and all former teachers and everyone who have taught me.
Very special thanks go out to the Royal Thai government for financial support and gave
me an opportunity to complete my Ph.D. study in Japan and all concerned personality
for giving me the academic direction, technical support as well as every means to