Acknowledgement
First and foremost, we would like to show our gratitude to the lecturer, Aj.Athitaya Pathanfor the valuable advice and gave us a great opportunity to do this report in order to collect knowledge and information during internship period.
Besides, we would like to thank Mae Fah Luang University for providing us a nice environment and useful facilities to complete this report. In addition, we would also thank all of the textbooks that give us an information which related to the topic of our report.
Finally, an honorable mention goes to our families, job supervisors and group members for their supports. Without helps of the particular that mentioned above, we would face many problems while doing this report.