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1.	Baptista, Marcia Lourenco, et al. (författare) A self-organizing map and a normalizing multi-layer perceptron approach to baselining in prognostics under dynamic regimes 2021 Ingår i: Neurocomputing. - : Elsevier. - 0925-2312 .- 1872-8286. ; 456, s. 268-287 Tidskriftsartikel (refereegranskat)abstract When the influence of changing operational and environmental conditions is not factored out, it can be dificult to observe a clear deterioration path. This can significantly affect the task of prognostics and other analytic operations. To address this issue, it is necessary to baseline the data, typically by first finding the operating regimes and then normalizing the data within each regime. In this paper, we propose the use of machine learning techniques to perform baselining. A self-organizing map identifies the regimes, and a multi-layer perceptron normalizes the data based on the detected regimes. Tests are performed on the C-MAPSS data. The approach is capable of producing similar results to classical methods without the need to specify in advance the number of regimes and the explicit computation of the statistical properties of a hold-out dataset. Importantly, the techniques can be integrated into a deep learning system to perform prognostics in a single pass.

Baptista, Marcia Lourenco, et al. (författare)
A self-organizing map and a normalizing multi-layer perceptron approach to baselining in prognostics under dynamic regimes
2021
Ingår i: Neurocomputing. - : Elsevier. - 0925-2312 .- 1872-8286. ; 456, s. 268-287
Tidskriftsartikel (refereegranskat)abstract
- When the influence of changing operational and environmental conditions is not factored out, it can be dificult to observe a clear deterioration path. This can significantly affect the task of prognostics and other analytic operations. To address this issue, it is necessary to baseline the data, typically by first finding the operating regimes and then normalizing the data within each regime. In this paper, we propose the use of machine learning techniques to perform baselining. A self-organizing map identifies the regimes, and a multi-layer perceptron normalizes the data based on the detected regimes. Tests are performed on the C-MAPSS data. The approach is capable of producing similar results to classical methods without the need to specify in advance the number of regimes and the explicit computation of the statistical properties of a hold-out dataset. Importantly, the techniques can be integrated into a deep learning system to perform prognostics in a single pass.

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