The Z-CUSUM Control Chart for the Process with Recurring Cycles or Frequent Small Shifts

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Journal of Korean Society for Quality Management > Volume 32(2); 2004 > Article

Journal of Korean Society for Quality Management 2004;32(2): 132-.

순환주기나 빈번한 작은 이동이 발생하는 공정관리틀 위한 Z-CUSUM 관리도

강해운¹, 강창욱², 백재원¹

¹한양대학교 산업공학과
²한양대학교 산업공학

The Z-CUSUM Control Chart for the Process with Recurring Cycles or Frequent Small Shifts

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.

Key Words: recurring cycle;small shifts;Z -CUSUM control chart;