Search Results for author: Xiu Yang

Found 10 papers, 0 papers with code

Gaussian Process Regression with Soft Inequality and Monotonicity Constraints

no code implementations3 Apr 2024 Didem Kochan, Xiu Yang

Introducing the QHMC method to the inequality and monotonicity constrained GP regression in the probabilistic sense, our approach improves the accuracy and reduces the variance in the resulting GP model.

regression

Solving Seismic Wave Equations on Variable Velocity Models with Fourier Neural Operator

no code implementations25 Sep 2022 Bian Li, Hanchen Wang, Xiu Yang, Youzuo Lin

Previous works that concentrate on solving the wave equation by neural networks consider either a single velocity model or multiple simple velocity models, which is restricted in practice.

Computational Efficiency Operator learning +1

Graphical Gaussian Process Regression Model for Aqueous Solvation Free Energy Prediction of Organic Molecules in Redox Flow Battery

no code implementations15 Jun 2021 Peiyuan Gao, Xiu Yang, Yu-Hang Tang, Muqing Zheng, Amity Anderson, Vijayakumar Murugesan, Aaron Hollas, Wei Wang

The solvation free energy of organic molecules is a critical parameter in determining emergent properties such as solubility, liquid-phase equilibrium constants, and pKa and redox potentials in an organic redox flow battery.

Dimensionality Reduction

A Physics-Informed Neural Network Framework For Partial Differential Equations on 3D Surfaces: Time-Dependent Problems

no code implementations19 Mar 2021 Zhiwei Fang, Justin Zhang, Xiu Yang

In this paper, we show a physics-informed neural network solver for the time-dependent surface PDEs.

Augmented Gaussian Random Field: Theory and Computation

no code implementations3 Sep 2020 Sheng Zhang, Xiu Yang, Samy Tindel, Guang Lin

We prove that under certain conditions, the observable and its derivatives of any order are governed by a single Gaussian random field, which is the aforementioned AGRF.

Statistics Theory Probability Statistics Theory

Multifidelity Data Fusion via Gradient-Enhanced Gaussian Process Regression

no code implementations3 Aug 2020 Yixiang Deng, Guang Lin, Xiu Yang

We compare this method with the conventional multi-fidelity Cokriging method that does not use gradients information, and the result suggests that GE-Cokriging has a better performance in predicting both QoI and its gradients.

GPR regression

Nonnegativity-Enforced Gaussian Process Regression

no code implementations7 Apr 2020 Andrew Pensoneault, Xiu Yang, Xueyu Zhu

Gaussian Process (GP) regression is a flexible non-parametric approach to approximate complex models.

regression

When Bifidelity Meets CoKriging: An Efficient Physics-Informed Multifidelity Method

no code implementations7 Dec 2018 Xiu Yang, Xueyu Zhu, Jing Li

In this work, we propose a framework that combines the approximation-theory-based multifidelity method and Gaussian-process-regression-based multifidelity method to achieve data-model convergence when stochastic simulation models and sparse accurate observation data are available.

Physics-Information-Aided Kriging: Constructing Covariance Functions using Stochastic Simulation Models

no code implementations10 Sep 2018 Xiu Yang, Guzel Tartakovsky, Alexandre Tartakovsky

We also provide an error estimate in preserving the physical constraints when errors are included in the stochastic model realizations.

Active Learning GPR

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