ขอขอบคุณทุกท่าน

Acknowledgement

Successful completion of this thesis would not have been possible without the assistance, encouragement and the gracefulness of many people. I would like to express my deepest thanks and gratitude to them.

Firstly and foremost, I am grateful to Assoc. Prof. Niramon Sutummakid, my advisor who has not only inspired me to select the environmental topic, but also provided invaluable suggestion, comprehension, encouragement, concentration, and untiring supervision throughout every chapter of my thesis. I also would like to thank my thesis committee, Assoc. Prof. Yuavares Tubpun and Asst. Prof. Euamporn Phijaisanit who gave helpful comments and suggestions.

I would like to show appreciation to the Diethelm Co., Ltd. for granting me two-year scholarship throughout the course of the MA Program.

I would like to thanks for great facilitate of Mr. Buncha Wisatemongkolchai, Deputy Director of Mahachai Hospital; Mr. Rungsun and Mrs. Supranee Intarachathorn; Mr. Chartchai and Mrs. Chumsri Kanatiyanont; Archan Kanlaya Sakunkeaw of Nawamintrachinutit Bodindecha School; Dr.Napat Noinamsai of Nakhon Ratchasima Rajabhat University; Mr. Noi; Mr. Singtoh and his basset hound.

I am very thankful to Muang Nakhon Ratchasima Municipality officers: Mayor; Director of Waterworks Office; Ms.Wantanee Himman-ngan; Mr. Rachan Teerapittayatrakul for great help in data collection.

I would like to give thankfulness to Director of Maharat Hospital; Mr. Mungkorn Ungsanant, Head of Social Welfare Department; Ms. Mathuros Chaiworaporn, Head of Clinical Pathology Department; Ms. Ajchara, Head of CCU ward; and Ms. Temsiri. I also thank to Director of Sikhiu Hospital; Ms. Warunee Eawchai; and all officers of Nakhon Ratchasima Public Health Office, especially, Khun Poo.

Special thanks to Mr. Prasert Karnchanakiartkul, researcher of Nakhon Ratchasima Agricultural Office, who recommended me to use the GIS. And thanks to all of the villagers for your kindness in survey.

Thanks to my helpful and lovely friends who always give me a cheerfulness: P’Tao, P’Kai, P’Air, P’Witt, P’Ton, P’Pui, BoBo, P’Pick, P’Mai, P’9, Archan Chol, Namtip, Golf, Poon, Aim, Champ, Lop, Him, Jeaw, Am, Rung, Lotto, Pan, and all members of Kor1 Family, especially, Netty.

I deepest indebted my beloved family: my dad and my mom for their love and money supporting. Thanks to my sister (Jung) and all of my relatives for their warm welcome in weekly activities.

Last but not least, there are other people who have contributed to this work whom I cannot mention here. I would like to thanks to all of them.

Finally, any deficiencies in this thesis are my responsibility.

Thammasat University Supawat Sukhaparamate

Bangkok, Thailand May 2008