02968nas|a2200385 i 4500 20260818085650.0 210400s1999 th uzm rtt 00| a1eng d .b11785986 AIT Thesis no.ISE-99-28 Ussanee Purintrapiban CUSUM and EWMA control charts for process control to approach Six-Sigma quality : a case study of continuous and discrete processes Bangkok : Asian Institute of Technology, 1999 184 p.: ill. Thesis ; no. ISE-99-28 Thesis (M.Eng.) - Asian Institute of Technology A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies 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. Quality control Shanker, Kripa, Chairperson Nagarur, Nagendra N., Examination Committee Hasin, M.A.A., Examination committee Partial Scholarship Asian Institute of Technology, Scholarship donor Asian Institute of Technology. Thesis ; no. ISE-99-28 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B12303 .b11785986 mnait u 240330 0 000421 m a u 0 mnait mnarc 22 40 Barcode : 30050120814578 CREATED : 2014-03-31 RECORD # : i12782701 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160099569 CREATED : 2016-04-27 RECORD # : i12958761 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 25235 25235 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.ISE-99-28 30050120814578 2026-08-18 08:56:50 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.ISE-99-28 30050160099569 2026-08-18 08:56:50 1 2026-08-18 40