Search Results for author: Eleni Chatzi

Found 15 papers, 9 papers with code

NNG-Mix: Improving Semi-supervised Anomaly Detection with Pseudo-anomaly Generation

1 code implementation20 Nov 2023 Hao Dong, Gaëtan Frusque, Yue Zhao, Eleni Chatzi, Olga Fink

While AD is typically treated as an unsupervised learning task due to the high cost of label annotation, it is more practical to assume access to a small set of labeled anomaly samples from domain experts, as is the case for semi-supervised anomaly detection.

Data Augmentation Fault Detection +4

Discussing the Spectrum of Physics-Enhanced Machine Learning; a Survey on Structural Mechanics Applications

no code implementations31 Oct 2023 Marcus Haywood-Alexander, Wei Liu, Kiran Bacsa, Zhilu Lai, Eleni Chatzi

The intersection of physics and machine learning has given rise to the physics-enhanced machine learning (PEML) paradigm, aiming to improve the capabilities and reduce the individual shortcomings of data- or physics-only methods.

SimMMDG: A Simple and Effective Framework for Multi-modal Domain Generalization

1 code implementation NeurIPS 2023 Hao Dong, Ismail Nejjar, Han Sun, Eleni Chatzi, Olga Fink

In real-world scenarios, achieving domain generalization (DG) presents significant challenges as models are required to generalize to unknown target distributions.

Contrastive Learning Domain Generalization

Knowledge Engineering for Wind Energy

no code implementations1 Oct 2023 Yuriy Marykovskiy, Thomas Clark, Justin Day, Marcus Wiens, Charles Henderson, Julian Quick, Imad Abdallah, Anna Maria Sempreviva, Jean-Paul Calbimonte, Eleni Chatzi, Sarah Barber

It presents the main concepts underpinning Knowledge-Based Systems and summarises previous work in the areas of knowledge engineering and knowledge representation in a manner that is relevant and accessible to domain experts.

POMDP inference and robust solution via deep reinforcement learning: An application to railway optimal maintenance

1 code implementation16 Jul 2023 Giacomo Arcieri, Cyprien Hoelzl, Oliver Schwery, Daniel Straub, Konstantinos G. Papakonstantinou, Eleni Chatzi

The POMDP with uncertain parameters is then solved via deep RL techniques with the parameter distributions incorporated into the solution via domain randomization, in order to develop solutions that are robust to model uncertainty.

Decision Making Reinforcement Learning (RL)

Bridging POMDPs and Bayesian decision making for robust maintenance planning under model uncertainty: An application to railway systems

1 code implementation15 Dec 2022 Giacomo Arcieri, Cyprien Hoelzl, Oliver Schwery, Daniel Straub, Konstantinos G. Papakonstantinou, Eleni Chatzi

We present a framework to estimate POMDP transition and observation model parameters directly from available data, via Markov Chain Monte Carlo (MCMC) sampling of a Hidden Markov Model (HMM) conditioned on actions.

Decision Making

Neural Extended Kalman Filters for Learning and Predicting Dynamics of Structural Systems

1 code implementation9 Oct 2022 Wei Liu, Zhilu Lai, Kiran Bacsa, Eleni Chatzi

Typically, conventional variational inference models are parameterized by neural networks independent of the latent dynamics models.

Variational Inference

Vold-Kalman Filter Order tracking of Axle Box Accelerations for Railway Stiffness Assessment

no code implementations26 Sep 2022 Cyprien Amadis Hoelzl, Vasilis Dertimanis, Lucian Ancu, Aurelia Kollros, Eleni Chatzi

Intelligent data-driven monitoring procedures hold enormous potential for ensuring safe operation and optimal management of the railway infrastructure in the face of increasing demands on cost and efficiency.

Management

Neural modal ordinary differential equations: Integrating physics-based modeling with neural ordinary differential equations for modeling high-dimensional monitored structures

1 code implementation16 Jul 2022 Zhilu Lai, Wei Liu, Xudong Jian, Kiran Bacsa, Limin Sun, Eleni Chatzi

In the scope of physics-informed machine learning, this paper proposes a framework -- termed Neural Modal ODEs -- to integrate physics-based modeling with deep learning for modeling the dynamics of monitored and high-dimensional engineered systems.

Physics-informed machine learning

Physics-guided Deep Markov Models for Learning Nonlinear Dynamical Systems with Uncertainty

1 code implementation16 Oct 2021 Wei Liu, Zhilu Lai, Kiran Bacsa, Eleni Chatzi

To address this, we bridge physics-based state space models with Deep Markov Models, thus delivering a hybrid modeling framework for unsupervised learning and identification of nonlinear dynamical systems.

Variational Inference

Value of information from vibration-based structural health monitoring extracted via Bayesian model updating

no code implementations12 Mar 2021 Antonios Kamariotis, Eleni Chatzi, Daniel Straub

We quantify this value by adaptation of the Bayesian decision analysis framework.

Applications Systems and Control Systems and Control

Foundations of Population-Based SHM, Part IV: The Geometry of Spaces of Structures and their Feature Spaces

no code implementations5 Mar 2021 George Tsialiamanis, Charilaos Mylonas, Eleni Chatzi, Nikolaos Dervilis, David J. Wagg, Keith Worden

One of the requirements of the population-based approach to Structural Health Monitoring (SHM) proposed in the earlier papers in this sequence, is that structures be represented by points in an abstract space.

Remaining Useful Life Estimation Under Uncertainty with Causal GraphNets

1 code implementation23 Nov 2020 Charilaos Mylonas, Eleni Chatzi

In this work, a novel approach for the construction and training of time series models is presented that deals with the problem of learning on large time series with non-equispaced observations, which at the same time may possess features of interest that span multiple scales.

Time Series Time Series Analysis

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