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Sensors 2015, 15(5), 10180-10193; doi:10.3390/s150510180

Metal Oxide Gas Sensor Drift Compensation Using a Two-Dimensional Classifier Ensemble

College of Electronic Science and Technology, Dalian University of Technology, No. 2 Linggong Road, Dalian 116023, China
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Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 25 February 2015 / Revised: 25 April 2015 / Accepted: 28 April 2015 / Published: 30 April 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
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Abstract

Sensor drift is the most challenging problem in gas sensing at present. We propose a novel two-dimensional classifier ensemble strategy to solve the gas discrimination problem, regardless of the gas concentration, with high accuracy over extended periods of time. This strategy is appropriate for multi-class classifiers that consist of combinations of pairwise classifiers, such as support vector machines. We compare the performance of the strategy with those of competing methods in an experiment based on a public dataset that was compiled over a period of three years. The experimental results demonstrate that the two-dimensional ensemble outperforms the other methods considered. Furthermore, we propose a pre-aging process inspired by that applied to the sensors to improve the stability of the classifier ensemble. The experimental results demonstrate that the weight of each multi-class classifier model in the ensemble remains fairly static before and after the addition of new classifier models to the ensemble, when a pre-aging procedure is applied. View Full-Text
Keywords: sensor drift; metal oxide sensors; classifier ensemble; support vector machines sensor drift; metal oxide sensors; classifier ensemble; support vector machines
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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. (CC BY 4.0).

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Liu, H.; Chu, R.; Tang, Z. Metal Oxide Gas Sensor Drift Compensation Using a Two-Dimensional Classifier Ensemble. Sensors 2015, 15, 10180-10193.

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