earticle

영어

The proposed design method minimizes bias, i.e., an average time to signal for the shift of process from the target value (ATS) curve, as well as it applies a VSI method to an attribute control chart for detecting a process shift efficiently. The results of the factorial experiment obtained by various parameter circumstances show that the VSI  control chart using nearly unbiased ATS design provides the smallest decreasing rate in ATS among other charts for all experimental cases. We present an optimization model that may efficiently provide optimal ATS values for process parameters in a steady state, and that may efficiently establish parameter correct control chart by supplying an optimization algorithm.