
[iii]
Acknowledgements
There are many people who supported and encouraged me throughout the completion of my
thesis during this long period of my study in a PhD program. They have to be acknowledged.
I would like to thank all of them and express my deepest gratitude for all of their support
towards the completion of my study.
I would like to express my deepest gratitude to my supervisors for their assistance, guidance,
time, constructive criticism, and discussion at every stage throughout my PhD study;
Professor Brian Corbitt, Dr Konrad Peszynski and Dr Theerasak Thanasankit. Professor Brian
Corbitt has been a great supervisor providing his wisdom, guidance, and great supervision
over the past five years. He has worked with me days and nights; especially during in the final
stages to complete this thesis. He was not only a supervisor, but he also has been a great
supporter through the completion of my final thesis.
I would also like to deeply thank Dr Konrad Peszynski and Dr Theerasak Thanasankit for
their supervision that guided my research background. They offered invaluable comments
throughout my full thesis as well as providing full support and feedback. Their supervision
encouraged me to conduct research in the right direction. Konrad also worked very hard with
me days and nights during my final stage, something I will never forget. Our good
relationship will remain the same forever.
To my parents (Mr Jessada and Mrs Siriwan Dejsakulrit) who always supported, encouraged
and blessed me to graduate and to be successful, I would like to thank them for their
understanding, and comfort when I was in many difficult situations during my study. They
always have good words of support. Also, the moment that I could not forget, Mrs Siriwan
Dejsakulrit always cheered me up when I worked on my thesis late at night.
I would like to thank Dr Phoommhiphat Mingmalairaks who had brought me to RMIT
University, introduced me to all his good friends at RMIT, and provided comments on my
writing before submission to supervisors, especially in the final year of my PhD. His feedback
on my writing made me feel more comfortable and helped me shape my writing in the right
direction. Special thanks are due to Dr Sriprai Sakrungpongsakul for her comments on the
context of my thesis. Dr Phoommhiphat Mingmalairaks and Dr Sriprai Sakrungpongsakul
have been a great resource for me to improve my academic writing skills. To my dear friends,