| Author | Ussanee Purintrapiban |
| Call Number | AIT Thesis no.ISE-99-28 |
| Subject(s) | Quality control.
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ISE-99-28 |
| Abstract | Six-Sigma concept is a relatively new way to measure how "good" a product is. When a
product is Six-Sigma compliant it tell us that product quality is excellent. The Six-Sigma
quality concept recognizes that a small amount of variation will be present as a result of slight
fluctuations in environmental conditions. Thus, we have to know as soon as possible when
small shifts occur. Two types of control charts, CUSUM and EWMA, are recommended for
this situation. Furthermore, X and R charts are also the good candidates. Which one is most
suitable for continuous and discrete type of processes? To answer this question, data are
collected from continuous and discrete processes. Data are analyzed by checking the
sufficiency of sample, the normal assumption, and randomness. Then three types of control
charts are applied and compared the performance. Based on the results, there is no strongly
conclusion to indicate the most suitable for continuous and discrete processes. However, when
small shifts are of interesting, the abilities of CUSUM and EWMA control charts are better
than the ability of X and R charts. On the contrary, X and R charts are the most effective
charts when large shifts are of interesting. |
| Year | 1999 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ISE-99-28 |
| Type | Thesis |
| School | School of Advanced Technologies (SAT) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Industrial Systems Engineering (ISE) |
| Chairperson(s) | Shanker, Kripa; |
| Examination Committee(s) | Nagarur, N. N.;Hasin, M.A.A.; |
| Scholarship Donor(s) | Partial Scholarship Asian Institute of Technology; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology |