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Computational Intelligence and Neuroscience
Volume 2015, Article ID 939248, 9 pages
http://dx.doi.org/10.1155/2015/939248
Research Article

An Effective and Novel Neural Network Ensemble for Shift Pattern Detection in Control Charts

IE Department, The University of Jordan, Amman 11942, Jordan

Received 7 May 2015; Accepted 6 July 2015

Academic Editor: José David Martín-Guerrero

Copyright © 2015 Mahmoud Barghash. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Pattern recognition in control charts is critical to make a balance between discovering faults as early as possible and reducing the number of false alarms. This work is devoted to designing a multistage neural network ensemble that achieves this balance which reduces rework and scrape without reducing productivity. The ensemble under focus is composed of a series of neural network stages and a series of decision points. Initially, this work compared using multidecision points and single-decision point on the performance of the ANN which showed that multidecision points are highly preferable to single-decision points. This work also tested the effect of population percentages on the ANN and used this to optimize the ANN’s performance. Also this work used optimized and nonoptimized ANNs in an ensemble and proved that using nonoptimized ANN may reduce the performance of the ensemble. The ensemble that used only optimized ANNs has improved performance over individual ANNs and three-sigma level rule. In that respect using the designed ensemble can help in reducing the number of false stops and increasing productivity. It also can be used to discover even small shifts in the mean as early as possible.