We would like to express we sincere thanks to we report advisor, Ms.Wanwimol Chutworakitpanich for her invaluable help, gave appreciate suggestion, checked and corrected the fault of this report and constant encouragement throughout the course of this report since start until successful. We are 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 this report would not have been completed without all the support that We have always received from her.