Themistoklis P Sapsis
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Explore the profile of Themistoklis P Sapsis including associated specialties, affiliations and a list of published articles.
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18
Citations
135
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Recent Articles
1.
Pickering E, Sapsis T
Entropy (Basel)
. 2024 Oct;
26(10).
PMID: 39451911
Misleading or unnecessary data can have out-sized impacts on the health or accuracy of Machine Learning (ML) models. We present a Bayesian sequential selection method, akin to Bayesian experimental design,...
2.
Pickering E, Guth S, Karniadakis G, Sapsis T
Nat Comput Sci
. 2024 Jan;
2(12):823-833.
PMID: 38177389
Extreme events in society and nature, such as pandemic spikes, rogue waves or structural failures, can have catastrophic consequences. Characterizing extremes is difficult, as they occur rarely, arise from seemingly...
3.
Sapsis T, Blanchard A
Philos Trans A Math Phys Eng Sci
. 2022 Jun;
380(2229):20210197.
PMID: 35719070
We derive criteria for the selection of datapoints used for data-driven reduced-order modelling and other areas of supervised learning based on Gaussian process regression (GPR). While this is a well-studied...
4.
Output-weighted optimal sampling for Bayesian regression and rare event statistics using few samples
Sapsis T
Proc Math Phys Eng Sci
. 2020 Mar;
476(2234):20190834.
PMID: 32201483
For many important problems the quantity of interest is an unknown function of the parameters, which is a random vector with known statistics. Since the dependence of the output on...
5.
6.
Blanchard A, Sapsis T
Chaos
. 2019 Nov;
29(11):113120.
PMID: 31779360
For a large class of dynamical systems, the optimally time-dependent (OTD) modes, a set of deformable orthonormal tangent vectors that track directions of instabilities along any trajectory, are known to...
7.
Farazmand M, Sapsis T
Phys Rev E
. 2019 Oct;
100(3-1):033110.
PMID: 31639920
Extreme events that arise spontaneously in chaotic dynamical systems often have an adverse impact on the system or the surrounding environment. As such, their mitigation is highly desirable. Here, we...
8.
Predicting ocean rogue waves from point measurements: An experimental study for unidirectional waves
Cousins W, Onorato M, Chabchoub A, Sapsis T
Phys Rev E
. 2019 Apr;
99(3-1):032201.
PMID: 30999506
Rogue waves are strong localizations of the wave field that can develop in different branches of physics and engineering, such as water or electromagnetic waves. Here, we experimentally quantify the...
9.
Mohamad M, Sapsis T
Proc Natl Acad Sci U S A
. 2018 Oct;
115(44):11138-11143.
PMID: 30327341
We develop a method for the evaluation of extreme event statistics associated with nonlinear dynamical systems from a small number of samples. From an initial dataset of design points, we...
10.
Sapsis T
Philos Trans A Math Phys Eng Sci
. 2018 Jul;
376(2127).
PMID: 30037931
We discuss extreme events as random occurrences of strongly transient dynamics that lead to nonlinear energy transfers within a chaotic attractor. These transient events are the result of finite-time instabilities...