Acknowledgements
First, I thank my advisor Assistant Professor Dr.Sompong Sirisophonsilp for his
continuous support throughout the thesis since starting creating an idea, raise the
proposal, implement the data and finalized the result. He always promptly listened
and gave me advice. He is expert in inventory management and has many experience
background knowledge in different kind of products in inventory management. He
guided me to have a right way thinking concept reasonably and how to approach a
research problem.