순환주기나 빈번한 작은 이동이 발생하는 공정관리를 위한 Z-CUSUM 관리도

Abstract

CUSUM control charts are widely used to monitor processes with small shifts. CUSUM control charts are,however, less effective in detecting for recurring cycles or frequent small shifts in the processes. With Shewhart control charts, we have applied the variety of run rules to check the stability of process in addition to the situations that some points fall outside the control limits. In this paper, we propose the Z-CUSUM control chart for monitoring the process with recurring cycles or frequent small shifts by use of the zone concept as like the Shewhart control charts.