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
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)
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
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
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)
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
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
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)
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
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 

UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

Citation Index includes data from a number of different sources. If you have questions about the sources of data in the Citation Index or need a set of data which is free to re-distribute, please contact us.

Certain data included herein are derived from the Web of Science© and InCites© (2025) of Clarivate Analytics. All rights reserved. You may not copy or re-distribute this material in whole or in part without the prior written consent of Clarivate Analytics.