FIR CV-EWMA 관리도

• 영문명: FIR CV-EWMA Control Chart
• 발행기관: 한국산업경영시스템학회
• 저자명: 홍의표(Eui-Pyo Hong) 강해운(Hae-Woon Kang) 강창욱(Chang-Wook Kang) 백재원(Jae-Won Baek)
• 간행물 정보: 『산업경영시스템학회지』제33권 제3호, 146~153쪽, 전체 8쪽
• 주제분류: 경제경영 > 경영학
• 파일형태: PDF
• 발행일자: 2010.09.30

영문 초록

When the production run is short and process parameters change frequently, it is difficult to monitor the process using traditional control charts. In such a case, the coefficient of variation (CV) is very useful for monitoring the process variability. The CV control chart is an effective tool to control the mean and variability of process simultaneously. The CV control chart, however, is not sensitive at small shifts in the magnitude of CV. The CV-EWMA(exponentially weighted moving average) control chart which was developed recently is effective in detecting a small shifts of CV. Since the CV-EWMA control chart scheme can be viewed as a weighted average of all past and current CV values, it is very sensitive to small change of mean and variability of the process. In this paper, we propose an FIR(Fast initial response) CV-EWMA control chart to improve the sensitivity of a CV-EWMA scheme at process start-up or out-of-control process. Moreover, we suggest the values of design parameters and show the results of the performance study of FIR CV-EWMA control chart by the use of average run length(). Also, we compared the performance of FIR CV-EWMA control chart with that of the CV-EWMA control chart and we found that the CV-EWMA control chart gives longer in-control ARL and much shorter out-of-control ARL.

목차

1. 서 론

2. 변동계수의 통계적 특성과 확률분포

3. CV 관리도와 CV-EWMA 관리도

4. FIR을 이용한 CV-EWMA 관리도

5. 관리도들의 수행도 분석과 평가

6. 결 론

키워드

Control chart Coefficient of variation EWMA Fast Initial Response