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Allison L. Lewis

Works (4)

Updated: July 5th, 2023 15:38

2019 journal article

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

SIAM-ASA JOURNAL ON UNCERTAINTY QUANTIFICATION, 7(1), 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 journal article

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

JOURNAL OF COMPUTATIONAL PHYSICS, 324, 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 journal article

Gradient free active subspace construction using Morris screening elementary effects

COMPUTERS & MATHEMATICS WITH APPLICATIONS, 72(6), 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 conference paper

Model calibration for beam models in the presence of model discrepancy

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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