A Study of Demerit-CUSUM Control Chart and Interpretation Method

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Journal of Korean Society for Quality Management > Volume 31(1); 2003 > Article

Journal of Korean Society for Quality Management 2003;31(1): 132-.

Demerit-CUSUM 관리도와 해석방법에 관한 연구

나상민¹, 강창욱², 심성보²

¹LG 실트론
²한양대학교 산업공학과

A Study of Demerit-CUSUM Control Chart and Interpretation Method

ABSTRACT

As the technology has improved and demands of customers have varied, a lot of products are getting diverse and intricate. Consequently, the enterprise that produce products have to simultaneously consider the various variables for the very products. There are some scheme, such as Multivariate control chart and Demerit control chart, designed to simultaneously monitor the variables in the process. In this paper, we present an effective method for process control using the Demerit-CUSUM control chart in the process where nonconforming units or nonconformities are occured by various types. In addition, we show interpretation method for abnormal signal in order to quickly detect the assignable causes as Demerit-CUSUM control chart signals abnormality. we compare performance of Demerit control chart and Demerit-CUSUM control chart using example again used in the existing studies, and present result of performance accoriding to changing sample size and parameter.

Key Words: SPC;Demerit Control Chart;Cusum Control Chart;Interpretation;