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순환 주기나 Small Shifts의 빠른 변화를 갖는 Cumulative Sum 관리도
강해운(Hae Woon Kang),강창욱(Chang Wook Kang) 한국산업경영시스템학회 2002 한국산업경영시스템학회 학술대회 Vol.2002 No.추계
Cusum control chart are widely used in process with small shifts. Because of cusum control chart has reasonable detection capability for small shifts. But Cusum control chart has unreasonable detection capability for recurring cycles or quickly change of small shifts In Shewhart control charts with recurring cycles or quickly change of small shifts, when a point falls outside Shewhart control limits, the process is out of control. But, if assignable causes occur in process and the points falls inside its control limits, process can be considered in-control. For this situations, Shewhart control charts are used zones method ( ex> A, B, C ... ). ( We say ‘runs rules’ ) This paper investigated cumulative sum control chart for this some situations.
FIR을 이용한 Demerit-CUSUM 관리도의 수행도 평가
강해운(Hae-Woon Kang),강창욱(Chang-Wook Kang),백재원(Jae-Won Baik),남성호(Sung-Ho Nam) 한국산업경영시스템학회 2009 한국산업경영시스템학회지 Vol.32 No.1
Complex Products may present more than one type of defects and these defects are not always of equal severity. These defects are classified according to their seriousness and effect on product quality and performance. Demerit systems are very effective systems to monitoring the different types of defects. So, classical demerit control chart used to monitor counts of several different types of defects simultaneously in complex products. S.M. Na et al.(2003) proposed the Demerit-CUSUM for the improvement of the demerit control chart performance and Nembhard, D. A. et al.(2001) and G.Y. Cho et al.(2004) developed a Demerit control chart using the EWMA technique and evaluated the performance of the control chart. In this paper, we present an effective method for process control using the Demerit-CUSUM with fast initial response. Moreover, we evaluate exact performance of the Demerit-CUSUM control chart with fast initial response, Demerit-CUSUM and Demerit-EWMA according to changing sample size or parameters.
두 가지 복합 이상원인 영향이 있는 공정에 대한 VSS$\bar{x}$관리도의 경제적 설계
심성보,강창욱,강해운,Sim Seong-Bo,Kang Chang-Wook,Kang Hae-Woon 한국산업경영시스템학회 2004 한국산업경영시스템학회지 Vol.27 No.2
In statistical process control applications, variable sample size (VSS) $\bar{X}$ chart is often used to detect the assignable cause quickly. However, it is usually assumed that only one assignable cause results in the out-of-control in the process. In this paper, we propose the algorithm to minimize the function of cost per unit time and compare the economic design and the statistical design by use of the value of cost per unit time. We consider double assignable causes to occur with compound in the process and adopt the Markov chain approach to investigate the statistical properties of VSS $\bar{X}$ chart. A procedure that can calculate the control chart's parameters is proposed by the economic design.
강창욱(Chang Wook Kang),심성보(Seong Bo Sim),백재원(Jae Won Paik),강해운(Hae Woon Kang) 한국산업경영시스템학회 2002 한국산업경영시스템학회 학술대회 Vol.2002 No.추계
We developed the software named as Management Quality Renovation Software in 2002 as a government project supported by the Korean Standards Association. In this paper, we present our ways to help small and medium sized industries improve quality by Management Quality Renovation software.
변압기 권선공정에서의 수주 제작품의 단위공정 일정관리 시스템 개발과 다중회귀분석을 이용한 계획 리드타임 산출 및 관리 방안
강대완(Dae-Wan Kang),강창욱(Chang-Wook Kang),강해운(Hae-Woon Kang) 한국산업경영시스템학회 2008 한국산업경영시스템학회 학술대회 Vol.2008 No.하계
Extra-high voltage transformer industry has characteristic of small quantity batch production system by other order processing unlike general mass production system. In this industry, observance of time deadline is very important in market competitive power security and company continued existence. The transformer winding is a process that rolls a coil is coated with an electric insulation material in order to generate the required voltage using the voltage fluctuation. The winding process is very important production process in the extra-high voltage transformer manufacturing industry because winding process is core process that occupy weight about half of whole process and is process that decide current ratio of transformer. This paper proposes a statistical calculation and control method of planned leadtime on the basis of real data and informations for the A company in transformer winding process. Moreover, we develop unit process scheduling system.
이정훈 ( Jung Hoon Lee ),강해운 ( Hae Woon Kang ),홍의표 ( Eui Pyo Hong ),강창욱 ( Chang Wook Kang ) 한국품질경영학회 2010 품질경영학회지 Vol.38 No.3
The coefficient of variation represents the ratio of the standard deviation to the mean, and it is a useful statistic for comparing the degree of variation from one data series to another, even if the means are drastically different from each other. Recently, the CV control chart is developed for monitoring processes in such situations. However, the CV control chart has low performance in detecting small shift. Due to the development of equipment and technique, currently, small shift of process occurs more frequently than large shift. In this paper, we proposes the CV-CUSUM control chart using CUSUM scheme which is cumulative sum of the deviations between each data point and a target value to detect a small shift in the process. We also found that the FIR(fast initial response) CUSUM control chart is especially valuable at start-up or after a CV-CUSUM control chart has signaled out-of-control.
홍의표(Eui-Pyo Hong),강해운(Hae-Woon Kang),강창욱(Chang-Wook Kang),백재원(Jae-Won Baek) 한국산업경영시스템학회 2010 한국산업경영시스템학회 학술대회 Vol.2 No.-
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(ARL). 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.
변압기 권선공정에서의 수주 제작품의 단위공정 일정관리 시스템 개발과 다중회귀분석을 이용한 계획 리드타임 산출 및 관리 방안
강대완(Dae-Wan Kang),강창욱(Chang-Wook Kang),강해운(Hae-Woon Kang) 한국산업경영시스템학회 2008 한국산업경영시스템학회지 Vol.31 No.3
Ultra-high voltage transformer industry has characteristic of small quantity batch production system by other order processing unlike general mass production systems. In this industry, observance of time deadline is very important in market competitive power security and company continued existence. The transformer winding is a process that rolls a coil is coated with an electric insulation material in order to generate the required voltage using the voltage fluctuation.<BR> The winding process is very important production process in the extra-high voltage transformer manufacturing industry because winding process is core process that occupy weight about half of whole process and is process that decide current ratio of transformer. This paper proposes a statistical calculation and control method of planned leadtime on the basis of real data and informations for the A company in transformer winding process. Moreover, we develop unit process scheduling system.
두 가지 복합 이상원인 영향이 있는 공정에 대한 VSS관리도의 경제적 설계
심성보(Seong-Bo Sim),강창욱(Chang-Wook Kang),강해운(Hae-Woon Kang) 한국산업경영시스템학회 2004 한국산업경영시스템학회지 Vol.27 No.2
In statistical process control applications, variable sample size (VSS) chart is often used to detect the assignable cause quickly. However, it is usually assumed that only one assignable cause results in the out-of-control in the process. In this paper, we propose the algorithm to minimize the function of cost per unit time and compare the economic design and the statistical design by use of the value of cost per unit time. We consider double assignable causes to occur with compound in the process and adopt the Markov chain approach to investigate the statistical properties of VSS chart. A procedure that can calculate the control chart's parameters is proposed by the economic design.