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III


               This is to certify that the work here submitted is the result of the candidate’s own investigations.

               Due acknowledgement has been made of any assistance received.







                                                                                                                 ………………………. Signature

                                                                              (Dr.Prawit   Kongjan)

                                                                                                              Major Advisor





                                                                             ………………………. Signature
                                                                                                                 (Mr.Kullachat   Sama)

                                                                                                                      Candidate
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