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   simultaneous monitoring of multivariate-attribute process mean and variability using artificial neural networks  
   
نویسنده maleki mohammad reza ,amiri amirhossein
منبع journal of quality engineering and production optimization - 2015 - دوره : 1 - شماره : 1 - صفحه:43 -54
چکیده    In some statistical process control applications, the quality of the product is characterized by the combination of both correlated variable and attributes quality characteristics. in this paper, we propose a novel control scheme based on the combination of two multi-layer perceptron neural networks for simultaneous monitoring of mean vector as well as the covariance matrix in multivariate-attribute processes whose quality characteristics are correlated. the proposed neural network-based methodology not only detects separate mean and variance shifts, but also can efficiently detect simultaneous changes in mean vector and covariance matrix of multivariate-attribute processes. the performance of the proposed neural network-based methodology in detecting separate as well as simultaneous changes in the process is evaluated thorough a numerical example based on simulation in terms of average run length criterion and the results are compared with a statistical method based on the combination of two control charts that are developed for monitoring the mean vector and covariance matrix of multivariate-attribute processes, respectively. the results of model implementation on numerical example show the superior detection performance of the proposed nn-based methodology rather than the developed combined statistical control charts.
کلیدواژه average run length ,covariance matrix ,mean vector ,multilayer perceptron neural network ,multivariate-attribute process
آدرس shahed university, industrial engineering department, ایران, shahed university, industrial engineering department, ایران
پست الکترونیکی amiri@shahed.ac.ir
 
     
   
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