Search Results for author: Sascha Ranftl

Found 4 papers, 0 papers with code

Robust Bayesian Target Value Optimization

no code implementations11 Jan 2023 Johannes G. Hoffer, Sascha Ranftl, Bernhard C. Geiger

We consider the problem of finding an input to a stochastic black box function such that the scalar output of the black box function is as close as possible to a target value in the sense of the expected squared error.

Bayesian Optimization Gaussian Processes

A connection between probability, physics and neural networks

no code implementations26 Sep 2022 Sascha Ranftl

The central limit theorem then suggests that NNs can be constructed to obey a physical law by choosing the activation functions such that they match a particular kernel in the infinite-width limit.

Stochastic Modeling of Inhomogeneities in the Aortic Wall and Uncertainty Quantification using a Bayesian Encoder-Decoder Surrogate

no code implementations21 Feb 2022 Sascha Ranftl, Malte Rolf-Pissarczyk, Gloria Wolkerstorfer, Antonio Pepe, Jan Egger, Wolfgang von der Linden, Gerhard A. Holzapfel

Then to assess the uncertainty in the output stress distribution due to this stochastic constitutive model, a convolutional neural network, specifically a Bayesian encoder-decoder, was used as a surrogate model that maps the random input fields to the output stress distribution obtained from the FE analysis.

Decoder Uncertainty Quantification

Bayesian Surrogate Analysis and Uncertainty Propagation

no code implementations11 Jan 2021 Sascha Ranftl, Wolfgang von der Linden

In the process, the contribution of the uncertainties of the surrogate itself to the simulation output uncertainties are usually neglected.

Methodology Data Analysis, Statistics and Probability

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