The completion of this undertaking could not have been possible without the participation and assistance of so many people whose names may not all be enumerated. Their contributions are sincerely appreciated and gratefully acknowledged. However, I would like to express their deep appreciation and indebtedness particularly to the following.
Dr.Pitsutpong Endoo for him support, advices, guidance, valuable comment, suggestions, and provisions that benefited his much in the completion and success of this study, who gave him love, care, shelter in doing this research. Sharing his knowledge and helped in the analysis of data and its statistical computation. And last by giving an endless helped to finish this manuscript.
To all relatives, friends and others who in one way or another shared their support thank you
Above all, to the Great Almighty, the author of knowledge and wisdom, for his countless love.