An Integrated Model of SPC and EPC with Second-order Autoregressed Disturbance for the Process with Trend

추세가 있는 공정에서 이계자기회귀 각란 모형을 고려한 EPC와 SPC의 통합시스템

EPC seeks to minimize variability by transferring the output variable to a related process input(controllable) variable, while SPC seeks to reduce variability by detecting and eliminating assignable causes of variation. In the case of product control, a very reasonable objective is to try to minimize the variance of the output deviations from the target or set point. We consider an alternative EPC model with second-order autoregressive disturbance. We compare three control systems； EPC, EPC combined with EWMA, and Shewhart. This paper shows through simulation that the performance of the integrated model of EPC and SPC is more preferable than that of EPC.