Search Results for author: Lorenzo Pareschi

Found 11 papers, 1 papers with code

Modelling contagious viral dynamics: a kinetic approach based on mutual utility

no code implementations31 Dec 2023 Giulia Bertaglia, Lorenzo Pareschi, Giuseppe Toscani

The temporal evolution of a contagious viral disease is modelled as the dynamic progression of different classes of population with individuals interacting pairwise.

The kinetic theory of mutation rates

no code implementations30 Nov 2022 Lorenzo Pareschi, Giuseppe Toscani

The Luria--Delbr\"uck mutation model is a cornerstone of evolution theory and has been mathematically formulated in a number of ways.

Asymptotic-Preserving Neural Networks for multiscale hyperbolic models of epidemic spread

no code implementations25 Jun 2022 Giulia Bertaglia, Chuan Lu, Lorenzo Pareschi, Xueyu Zhu

To allow the neural network to operate uniformly with respect to the small scales, it is desirable that the neural network satisfies an Asymptotic-Preservation (AP) property in the learning process.

Spatial spread of COVID-19 outbreak in Italy using multiscale kinetic transport equations with uncertainty

no code implementations14 Jun 2021 Giulia Bertaglia, Walter Boscheri, Giacomo Dimarco, Lorenzo Pareschi

Because of the high uncertainty in the data reported in the early phase of the epidemic, the presence of random inputs in both the initial data and the epidemic parameters is included in the model.

Uncertainty Quantification

Modelling lockdown measures in epidemic outbreaks using selective socio-economic containment with uncertainty

no code implementations9 Jun 2021 Giacomo Albi, Lorenzo Pareschi, Mattia Zanella

After the introduction of drastic containment measures aimed at stopping the epidemic contagion from SARS-CoV2, many governments have adopted a strategy based on a periodic relaxation of such measures in the face of a severe economic crisis caused by lockdowns.

Hyperbolic compartmental models for epidemic spread on networks with uncertain data: application to the emergence of Covid-19 in Italy

no code implementations29 May 2021 Giulia Bertaglia, Lorenzo Pareschi

The importance of spatial networks in the spread of an epidemic is an essential aspect in modeling the dynamics of an infectious disease.

Mean-field control variate methods for kinetic equations with uncertainties and applications to socio-economic sciences

no code implementations4 Feb 2021 Lorenzo Pareschi, Torsten Trimborn, Mattia Zanella

In this paper, we extend a recently introduced multi-fidelity control variate for the uncertainty quantification of the Boltzmann equation to the case of kinetic models arising in the study of multiagent systems.

Numerical Analysis Statistical Mechanics Numerical Analysis Adaptation and Self-Organizing Systems

From particle swarm optimization to consensus based optimization: stochastic modeling and mean-field limit

no code implementations10 Dec 2020 Sara Grassi, Lorenzo Pareschi

A regularization process for the global best permits to formally derive the respective mean-field description.

Position

Consensus-Based Optimization on the Sphere: Convergence to Global Minimizers and Machine Learning

1 code implementation31 Jan 2020 Massimo Fornasier, Hui Huang, Lorenzo Pareschi, Philippe Sünnen

To quantify the performances of the new approach, we show that the algorithm is able to perform essentially as good as ad hoc state of the art methods in challenging problems in signal processing and machine learning, namely the phase retrieval problem and the robust subspace detection.

BIG-bench Machine Learning Retrieval

Consensus-Based Optimization on Hypersurfaces: Well-Posedness and Mean-Field Limit

no code implementations31 Jan 2020 Massimo Fornasier, Hui Huang, Lorenzo Pareschi, Philippe Sünnen

We introduce a new stochastic differential model for global optimization of nonconvex functions on compact hypersurfaces.

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