Search Results - subject:"PROCESS CONTROL"

Scaled critical factor index for optimal resource allocation in service and lean construction

Belay, Alemu Moges; Takala, Josu; Toshev, Rayko; … - In: International Journal of Sustainable Economy 5 (2013) 3, pp. 286-306

and the response rate was 48%. Different statistical process control charts were incorporated in the analysis to avoid …

Persistent link: https://www.econbiz.de/10011130047

Sequential monitoring of a Bernoulli sequence when the pre-change parameter is unknown

Ross, Gordon; Tasoulis, Dimitris; Adams, Niall - In: Computational Statistics 28 (2013) 2, pp. 463-479

The task of monitoring for a change in the mean of a sequence of Bernoulli random variables has been widely studied. However most existing approaches make at least one of the following assumptions, which may be violated in many real-world situations: (1) the pre-change value of the Bernoulli...

Persistent link: https://www.econbiz.de/10010847999

A CUSUM scheme for event monitoring

Qu, Liang; Wu, Zhang; Khoo, Michael B.C.; Castagliola, … - In: International Journal of Production Economics 145 (2013) 1, pp. 268-280

This article presents a single CUSUM scheme (called the GCUSUM chart) for simultaneously monitoring the time interval T and magnitude X of an event. For example, a traffic accident may be considered as an event, and the total loss in dollars in each case is the event magnitude. Since the GCUSUM...

Persistent link: https://www.econbiz.de/10010869111

Joint optimization of X¯ control chart and preventive maintenance policies: A discrete-time Markov chain approach

Xiang, Yisha - In: European Journal of Operational Research 229 (2013) 2, pp. 382-390

Statistical process control and maintenance planning have long been treated as two separate problems. The …. Information obtained in the course of statistical process control signals the need for possible maintenance actions, and thus … deterioration and improve product quality in conjunction with statistical process control. This paper presents an integrated model …

Persistent link: https://www.econbiz.de/10011052789

X̅ Charts with Variable Control and Warning Limits

Mahadik Shashibhushan B. - In: Economic Quality Control 28 (2013) 2, pp. 8-8

Adaptive control charts deliver significantly better performances than that of static control charts. However, the frequent switches between sampling interval lengths and/or between sample sizes can be a complicating factor in the administration of these charts. This factor is totally absent...

Persistent link: https://www.econbiz.de/10011015803

The median chart with estimated parameters

Castagliola, Philippe; Figueiredo, Fernanda Otilia - In: European Journal of Industrial Engineering 7 (2013) 5, pp. 594-614

A modified median chart with estimated control limits is proposed for monitoring the mean value of a normal process. The estimates for the nominal process parameters used to set up the control limits in Phase I are the average of the sample medians and the average of the sample ranges of m...

Persistent link: https://www.econbiz.de/10010722756

Monitoring kth order runs in binary processes

Weiß, Christian - In: Computational Statistics 28 (2013) 2, pp. 541-562

Procedures for continuously monitoring binary attribute data processes are of utmost relevance for fields like electrical engineering, chemical production, software quality engineering, healthcare monitoring, and many more. In this article, new approaches are proposed, where kth order runs in a...

Persistent link: https://www.econbiz.de/10010998502

Robust quality controlling: SPC with box plots and runs test

Besseris, George J. - In: The TQM Journal 25 (2013) 1, pp. 89-102

Purpose – The purpose of this paper is to propose a methodology that may assist quality professionals in assessing process variation with a combination of tools based on simple robust statistics. The technique targets alternative way of screening and detection of common and special causes in...

Persistent link: https://www.econbiz.de/10015032018

Minimal Euclidean distance chart based on support vector regression for monitoring mean shifts of auto-correlated processes

Du, Shichang; Lv, Jun - In: International Journal of Production Economics 141 (2013) 1, pp. 377-387

Though traditional control charts have been widely used as effective tools in statistical process control (SPC), they …

Persistent link: https://www.econbiz.de/10010594389

An optimisation design of the combined np-CUSUM scheme for attributes

Haridy, Salah; Wu, Zhang; Yu, Fong-Jung; Shamsuzzaman, … - In: European Journal of Industrial Engineering 7 (2013) 1, pp. 16-37

The np chart and the binomial cumulative sum (CUSUM) chart are attribute charts that monitor the fraction non-conforming p. While the np chart is effective for detecting large process shifts in p, the CUSUM chart is more powerful for detecting small and moderate p shifts. This article presents...

Persistent link: https://www.econbiz.de/10010670130