Acknowledgment
The success of this study has completed without the dedication
and support from many people. Frist of all, We would like to express
our sincere thanks to our research advisor, Dr. Varunee Surayotee for
her invaluable help and constant encouragement throughout the course
of this research. We most grateful for her teaching and advice, not only
the research methodologies but also many other methodologies in life.
We would not have achieved this far and would not have been
completed without all the support that We have always received from
her. We most gratefully acknowledge my parents and my friends for all
their support throughout the period of this research.