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Mathematical Problems in Engineering
Volume 2015 (2015), Article ID 765985, 6 pages
Research Article

Identification of CTQs for Complex Products Based on Mutual Information and Improved Gravitational Search Algorithm

1Department of Industrial Engineering, Tianjin University, Tianjin 300072, China
2College of Management, Tianjin University of Traditional Chinese Medicine, Tianjin 300073, China

Received 31 July 2014; Revised 13 November 2014; Accepted 13 November 2014

Academic Editor: Shifei Ding

Copyright © 2015 Huaqiang Wang et al. 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.


The identification of CTQs for complex products is the first step to implement quality control. To improve the efficiency and accuracy of CTQs identification, we propose a novel hybrid approach based on mutual information and improved gravitational search algorithm, which has advantages of filter and wrapper. At first, the information relevance and redundancy are measured by mutual information. Then, the improved gravitational search algorithm is used to search the CTQs. Experimentation is carried out using 2 UCI data sets, and the classification capability of CTQs is tested by SVM and tenfold cross validation. The results show that the presented method is verified to be effective and practically applicable.