Search Results for author: Matthew P. Juniper

Found 7 papers, 1 papers with code

Rapid Bayesian identification of sparse nonlinear dynamics from scarce and noisy data

no code implementations23 Feb 2024 Lloyd Fung, Urban Fasel, Matthew P. Juniper

We propose a fast probabilistic framework for identifying differential equations governing the dynamics of observed data.

Active Learning

Physics-informed compressed sensing for PC-MRI: an inverse Navier-Stokes problem

no code implementations4 Jul 2022 Alexandros Kontogiannis, Matthew P. Juniper

This prior information is updated using the Navier-Stokes problem, an energy-based segmentation functional, and by requiring that the reconstruction is consistent with the $k$-space signals.

Simultaneous boundary shape estimation and velocity field de-noising in Magnetic Resonance Velocimetry using Physics-informed Neural Networks

no code implementations16 Jul 2021 Ushnish Sengupta, Alexandros Kontogiannis, Matthew P. Juniper

In this paper, we present a physics-informed neural network that instead uses the noisy MRV data alone to simultaneously infer the most likely boundary shape and de-noised velocity field.

Forecasting Thermoacoustic Instabilities in Liquid Propellant Rocket Engines Using Multimodal Bayesian Deep Learning

no code implementations1 Jul 2021 Ushnish Sengupta, Günther Waxenegger-Wilfing, Jan Martin, Justin Hardi, Matthew P. Juniper

The 100 MW cryogenic liquid oxygen/hydrogen multi-injector combustor BKD operated by the DLR Institute of Space Propulsion is a research platform that allows the study of thermoacoustic instabilities under realistic conditions, representative of small upper stage rocket engines.

Time Series Analysis

Online parameter inference for the simulation of a Bunsen flame using heteroscedastic Bayesian neural network ensembles

1 code implementation26 Apr 2021 Maximilian L. Croci, Ushnish Sengupta, Matthew P. Juniper

Heteroscedastic Bayesian neural network ensembles are trained on a library of 1. 7 million flame fronts simulated in LSGEN2D, a G-equation solver, to learn the Bayesian posterior distribution of the model parameters given observations.

Real-time parameter inference in reduced-order flame models with heteroscedastic Bayesian neural network ensembles

no code implementations11 Oct 2020 Ushnish Sengupta, Maximilian L. Croci, Matthew P. Juniper

The trained neural networks are then used to infer model parameters from real videos of a premixed Bunsen flame captured using a high-speed camera in our lab.

Combined State and Parameter Estimation in Level-Set Methods

no code implementations1 Mar 2019 Hans Yu, Matthew P. Juniper, Luca Magri

Reduced-order models based on level-set methods are widely used tools to qualitatively capture and track the nonlinear dynamics of an interface.

Uncertainty Quantification

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