Search Results for author: Alexander Mitsos

Found 20 papers, 2 papers with code

Predicting the Temperature Dependence of Surfactant CMCs Using Graph Neural Networks

1 code implementation6 Mar 2024 Christoforos Brozos, Jan G. Rittig, Sandip Bhattacharya, Elie Akanny, Christina Kohlmann, Alexander Mitsos

We test the predictive quality of the model for following scenarios: i) when CMC data for surfactants are present in the training of the model in at least one different temperature, and ii) CMC data for surfactants are not present in the training, i. e., generalizing to unseen surfactants.

Data-Driven Model Reduction and Nonlinear Model Predictive Control of an Air Separation Unit by Applied Koopman Theory

no code implementations11 Sep 2023 Jan C. Schulze, Danimir T. Doncevic, Nils Erwes, Alexander Mitsos

Further, we present an NMPC implementation that uses derivative computation tailored to the fixed block structure of reduced Koopman models.

Model Predictive Control

End-to-End Reinforcement Learning of Koopman Models for Economic Nonlinear Model Predictive Control

no code implementations3 Aug 2023 Daniel Mayfrank, Alexander Mitsos, Manuel Dahmen

(Economic) nonlinear model predictive control ((e)NMPC) requires dynamic models that are sufficiently accurate and computationally tractable.

Model Predictive Control reinforcement-learning

Gibbs-Duhem-Informed Neural Networks for Binary Activity Coefficient Prediction

no code implementations31 May 2023 Jan G. Rittig, Kobi C. Felton, Alexei A. Lapkin, Alexander Mitsos

In contrast to recent hybrid ML approaches, our approach does not rely on embedding a specific thermodynamic model inside the neural network and corresponding prediction limitations.

Matrix Completion

A Recursively Recurrent Neural Network (R2N2) Architecture for Learning Iterative Algorithms

no code implementations22 Nov 2022 Danimir T. Doncevic, Alexander Mitsos, Yue Guo, Qianxiao Li, Felix Dietrich, Manuel Dahmen, Ioannis G. Kevrekidis

Meta-learning of numerical algorithms for a given task consists of the data-driven identification and adaptation of an algorithmic structure and the associated hyperparameters.

Inductive Bias Meta-Learning

Physical Pooling Functions in Graph Neural Networks for Molecular Property Prediction

no code implementations27 Jul 2022 Artur M. Schweidtmann, Jan G. Rittig, Jana M. Weber, Martin Grohe, Manuel Dahmen, Kai Leonhard, Alexander Mitsos

We recommend using sum pooling for the prediction of properties that depend on molecular size and compare pooling functions for properties that are molecular size-independent.

Molecular Property Prediction Property Prediction

Graph neural networks for the prediction of molecular structure-property relationships

no code implementations25 Jul 2022 Jan G. Rittig, Qinghe Gao, Manuel Dahmen, Alexander Mitsos, Artur M. Schweidtmann

Molecular property prediction is of crucial importance in many disciplines such as drug discovery, molecular biology, or material and process design.

Drug Discovery Molecular Property Prediction +1

Graph Machine Learning for Design of High-Octane Fuels

no code implementations1 Jun 2022 Jan G. Rittig, Martin Ritzert, Artur M. Schweidtmann, Stefanie Winkler, Jana M. Weber, Philipp Morsch, K. Alexander Heufer, Martin Grohe, Alexander Mitsos, Manuel Dahmen

We propose a modular graph-ML CAMD framework that integrates generative graph-ML models with graph neural networks and optimization, enabling the design of molecules with desired ignition properties in a continuous molecular space.

Bayesian Optimization BIG-bench Machine Learning +1

Normalizing Flow-based Day-Ahead Wind Power Scenario Generation for Profitable and Reliable Delivery Commitments by Wind Farm Operators

no code implementations5 Apr 2022 Eike Cramer, Leonard Paeleke, Alexander Mitsos, Manuel Dahmen

We present a specialized scenario generation method that utilizes forecast information to generate scenarios for day-ahead scheduling problems.

Scheduling

Nonlinear Isometric Manifold Learning for Injective Normalizing Flows

no code implementations8 Mar 2022 Eike Cramer, Felix Rauh, Alexander Mitsos, Raúl Tempone, Manuel Dahmen

To model manifold data using normalizing flows, we employ isometric autoencoders to design embeddings with explicit inverses that do not distort the probability distribution.

Density Estimation Model Selection

Validation Methods for Energy Time Series Scenarios from Deep Generative Models

no code implementations27 Oct 2021 Eike Cramer, Leonardo Rydin Gorjão, Alexander Mitsos, Benjamin Schäfer, Dirk Witthaut, Manuel Dahmen

The design and operation of modern energy systems are heavily influenced by time-dependent and uncertain parameters, e. g., renewable electricity generation, load-demand, and electricity prices.

Time Series Time Series Analysis

Principal Component Density Estimation for Scenario Generation Using Normalizing Flows

no code implementations21 Apr 2021 Eike Cramer, Alexander Mitsos, Raul Tempone, Manuel Dahmen

We train the resulting principal component flow (PCF) on data of PV and wind power generation as well as load demand in Germany in the years 2013 to 2015.

Density Estimation Image Generation +2

Using Gaussian Processes to Design Dynamic Experiments for Black-Box Model Discrimination under Uncertainty

no code implementations7 Feb 2021 Simon Olofsson, Eduardo S. Schultz, Adel Mhamdi, Alexander Mitsos, Marc Peter Deisenroth, Ruth Misener

Typically, several rival mechanistic models can explain the available data, so design of dynamic experiments for model discrimination helps optimally collect additional data by finding experimental settings that maximise model prediction divergence.

Gaussian Processes

Global Optimization of Gaussian processes

no code implementations21 May 2020 Artur M. Schweidtmann, Dominik Bongartz, Daniel Grothe, Tim Kerkenhoff, Xiaopeng Lin, Jaromil Najman, Alexander Mitsos

Often, Gaussian processes are trained on datasets and are subsequently embedded as surrogate models in optimization problems.

Bayesian Optimization Gaussian Processes

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