Buscar
Mostrando ítems 1-10 de 876
Monitoring the process mean with a side-sensitive synthetic- X¯ chart
(2013-01-01)
Control charts are designed to detect assignable causes that may occur in production processes. They are very simple operationally; however, this operational simplicity, that is, taking samples of fixed size n at regular ...
The use of principal components and univariate charts to control multivariate processes
(2008-01-01)
In this article, we evaluate the performance of the T2 chart based on the principal components (PC chart) and the simultaneous univariate control charts based on the original variables (SU X̄ charts) or based on the principal ...
The use of principal components and univariate charts to control multivariate processes
(2008-01-01)
In this article, we evaluate the performance of the T2 chart based on the principal components (PC chart) and the simultaneous univariate control charts based on the original variables (SU X̄ charts) or based on the principal ...
Monitoring the covariance matrix of bivariate processes with the DVMAX control charts
(2022-01-01)
Two versions of Phase II attribute+variable (DVMAX) control charts are investigated for monitoring the covariance matrix (Formula presented.) of bivariate processes. Monitoring always starts with an attribute chart employing ...
Design of the statistical control of low fraction nonconforming processes restricted to small samplesPlanejamento do controle estatístico de processos com baixa fração não conforme restrito a amostras pequenas
(2007-01-01)
We present the non-conventional design of no charts used for the surveillance of processes characterized by a very low fraction nonconforming, with a costly and/or time-consuming inspection procedure. which makes the ...
Economic design of two-stage (X)over-bar charts: the Markov chain approach
(Elsevier B.V., 2005-01-28)
When the (X) over bar chart is in use, samples are regularly taken from the process, and their means are plotted on the chart. In some cases, it is too expensive to obtain the X values, but not the values of a correlated ...
Economic design of two-stage (X)over-bar charts: the Markov chain approach
(Elsevier B.V., 2005-01-28)
When the (X) over bar chart is in use, samples are regularly taken from the process, and their means are plotted on the chart. In some cases, it is too expensive to obtain the X values, but not the values of a correlated ...
Erratum: Design of the statistical control of low fraction nonconforming processes restricted to small samples (Produçã (2007) vol. 17 (1) (139-150))
(2007-01-01)
We present the non-conventional design of np charts used for the surveillance of processes characterized by a very low fraction nonconforming, with a costly and/or time-consuming inspection procedure, which makes the ...
A synthetic control chart for monitoring the process mean and variance
(2006-04-10)
Purpose - The aim of this paper is to present a synthetic chart based on the non-central chi-square statistic that is operationally simpler and more effective than the joint X̄ and R chart in detecting assignable cause(s). ...
Synthetic control chart for monitoring the pprocess mean and variance
(Int Soc Sci Appl Technol, 2006-01-01)
In this article, we consider the synthetic control chart with two-stage sampling (SyTS chart) to control the process mean and variance. During the first stage, one item of the sample is inspected; if its value X, is close ...