Paper Information

Journal:   JOURNAL OF INDUSTRIAL ENGINEERING INTERNATIONAL   DECEMBER 2015 , Volume 11 , Number 4; Page(s) 505 To 515.
 
Paper: 

STEP CHANGE POINT ESTIMATION IN THE MULTIVARIATE-ATTRIBUTE PROCESS VARIABILITY USING ARTIFICIAL NEURAL NETWORKS AND MAXIMUM LIKELIHOOD ESTIMATION

 
 
Author(s):  MALEKI MOHAMMAD REZA, AMIRI AMIR HOSSEIN*, MOUSAVI SEYED MEYSAM
 
* DEPARTMENT OF INDUSTRIAL ENGINEERING, FACULTY OF ENGINEERING, SHAHED UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

In some statistical process control applications, the combination of both variable and attribute quality characteristics which are correlated represents the quality of the product or the process. In such processes, identification the time of manifesting the out-of-control states can help the quality engineers to eliminate the assignable causes through proper corrective actions. In this paper, first we use an artificial neural network (ANN) -based method in the literature for detecting the variance shifts as well as diagnosing the sources of variation in the multivariate-attribute processes. Then, based on the quality characteristics responsible for the out-of-control state, we propose a modular model based on the ANN for estimating the time of step change in the multivariate-attribute process variability.
We also compare the performance of the ANNbased estimator with the estimator based on maximum likelihood method (MLE). A numerical example based on simulation study is used to evaluate the performance of the estimators in terms of the accuracy and precision criteria.
The results of the simulation study show that the proposed ANN-based estimator outperforms the MLE estimator under different out-of-control scenarios where different shift magnitudes in the covariance matrix of multivariate attribute quality characteristics are manifested.

 
Keyword(s): CHANGE POINT ESTIMATION, COVARIANCE MATRIX, MULTILAYERED PERCEPTRON NEURAL NETWORK, MULTIVARIATE, ATTRIBUTE PROCESSES, PHASE II
 
References: 
 
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