نوع مقاله : پژوهشی
تازه های تحقیق
عنوان مقاله English
نویسندگان English
This fully connected neural network-based control chart is developed for monitoring the dispersion of multivariate processes with two important features: (1) the ability to be used for monitoring the dispersion of processes with high-dimensional data streams, and (2) the absence of the need to establish restrictive statistical assumptions, such as normality of the quality characteristics under study and the independence of observations in the samples taken. An important challenge that we usually face in training neural networks is overfitting or generalization failure. In this study, two tools of dropout layer and weight regularization are used in network design to face the mentioned challenge. In addition, in order to better train the neural network and unlike most control charts based on learning tools that use a two-class pattern of zero and one as target values, in this study the target values are determined based on the size and number of shifted components, so that as the shift size and the number of shifted components increase, the target values also increase. Next, in order to increase the power of the developed control chart in detecting disturbances in the covariance matrix elements, an improved version is presented with the help of two sensitizing rules 2 out of 3 and 4 out of 5. The performance of the proposed approaches is compared with two control charts ATL and RPLR using a numerical example. The results show that the approach equipped with sensitizing rules performs better than the competing charts in terms of two indices ARL and SDRL.
کلیدواژهها English
Copyright © Mir Milad Ghazvini, Ali Salmasnia
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