Allison L. Lewis

Works (4)

Updated: July 5th, 2023 15:38

2019 article

Gradient-Free Construction of Active Subspaces for Dimension Reduction in Complex Models with Applications to Neutronics

Coleman, K. D., Lewis, A., Smith, R. C., Williams, B., Morris, M., & Khuwaileh, B. (2019, January 1). SIAM/ASA Journal on Uncertainty Quantification, Vol. 7, pp. 117–142.

By: K. Coleman n, A. Lewis*, R. Smith n , B. Williams *, M. Morris * & B. Khuwaileh *

author keywords: gradient-free active subspaces; neutronics applications
topics (OpenAlex): Model Reduction and Neural Networks; Probabilistic and Robust Engineering Design; Advanced Numerical Methods in Computational Mathematics
TL;DR: This paper aims to demonstrate the ability to efficiently approximate complex models by constructing low-overtime subspace models using a simple model-to-model comparison procedure. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries
Added: April 9, 2019

2016 article

An information theoretic approach to use high-fidelity codes to calibrate low-fidelity codes

Lewis, A., Smith, R., Williams, B., & Figueroa, V. (2016, August 6). Journal of Computational Physics, Vol. 324, pp. 24–43.

By: A. Lewis n, R. Smith n , B. Williams * & V. Figueroa*

author keywords: Model calibration; Bayesian experimental design; Optimal evaluation; Mutual information
topics (OpenAlex): Probabilistic and Robust Engineering Design; Nuclear Engineering Thermal-Hydraulics; Model Reduction and Neural Networks
TL;DR: An information-theoretic framework is employed to determine the reduction in parameter uncertainty that is obtained by evaluating the high-fidelity code at a specific set of design conditions, which are chosen sequentially, based on the amount of information that they contribute to the low-f fidelity model parameters. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2016 article

Gradient free active subspace construction using Morris screening elementary effects

Lewis, A., Smith, R., & Williams, B. (2016, August 11). Computers & Mathematics with Applications, Vol. 72, pp. 1603–1615.

By: A. Lewis n, R. Smith n  & B. Williams *

author keywords: Active subspace construction; Reduced-order modeling; Morris screening
topics (OpenAlex): Probabilistic and Robust Engineering Design; Model Reduction and Neural Networks; Advanced Numerical Methods in Computational Mathematics
TL;DR: This work introduces a gradient-free active subspace construction method that avoids the need to sample from the gradient, which may not be available, via construction of a coarse approximation to the gradient matrix by employing the concept of "elementary effects" from Morris screening procedures. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2014 article

Model Calibration for Beam Models in the Presence of Model Discrepancy

Lewis, A. L., McMahan, J. A., & Smith, R. C. (2014, September 8). Proceedings of the ASME Conference on Smart Materials, Adaptive Structures and Intelligent Systems, 2014, Vol 1.

By: A. Lewis n, J. McMahan n & R. Smith n 

topics (OpenAlex): Shape Memory Alloy Transformations; Piezoelectric Actuators and Control; Topology Optimization in Engineering
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Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

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