Firstly, I would like to express my sincere gratitude to my advisor, Assistant Professor
Dr.Supaporn Suksern, for the continuous support of my study and related research, for
her patience, motivation and immense knowledge. I would not have achieved this far and
this thesis would not have been completed without all the support that I have always
received from her.
Besides my advisor, I would like to thank the rest of my thesis committee Assistant
Professor Dr.Sopita Khamrod and Dr.Jakkrid Sompong for their insightful comments and
encouragement
I want to thank Department of Mathematics, Faculty of Science at Naresuan University,
for helpful in providing facilities and materials for my project experiment.
I thank my fellow for the stimulating discussions, for the sleepless nights we were
working together before deadlines, and I also thank my friends in Department of Mathematics,
Faculty of Science at Naresuan University, for all the fun we had in the last four
years. And special thanks goes to tooktic and pla for enlightening me the first glance of
research.