Výsledky vyhledávání - "Liliana Borcea"

Waveform inversion via reduced order modeling

Autor: Liliana Borcea, Josselin Garnier, Alexander V. Mamonov, Jörn Zimmerling

We introduce a novel approach to waveform inversion based on a data-driven reduced order model (ROM) of the wave operator. The presentation is for the acoustic wave equation, but the approach can be extended to elastic or electromagnetic waves. The d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5fa75c3ad1aa7cf21f41aa22f5de451d
http://arxiv.org/abs/2202.01824

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Waveform inversion with a data driven estimate of the internal wave

Autor: Liliana Borcea, Josselin Garnier, Alexander V. Mamonov, Jörn Zimmerling

We study an inverse problem for the wave equation, concerned with estimating the wave speed, aka velocity, from data gathered by an array of sources and receivers that emit probing signals and measure the resulting waves. The typical mathematical for

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3003bf6cc60a2337ccd4cca6d4277a24

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Paraxial wave propagation in random media with long-range correlations

Autor: Liliana Borcea, Josselin Garnier, Knut Sølna

We study the paraxial wave equation with a randomly perturbed index of refraction, which can model the propagation of a wave beam in a turbulent medium. The random perturbation is a stationary and isotropic process with a general form of the covarian

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cea2a00e0c7d93043431a01f2ff24ae9

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Reduced order model approach for imaging with waves

Autor: Liliana Borcea, Josselin Garnier, Alexander V Mamonov, Jörn Zimmerling

Publikováno v: Inverse Problems
Inverse Problems, 2021, 38 (2), pp.025004. ⟨10.1088/1361-6420/ac41d0⟩

We introduce a novel, computationally inexpensive approach for imaging with an active array of sensors, which probe an unknown medium with a pulse and measure the resulting waves. The imaging function is based on the principle of time reversal in non

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d64c052f0b366265365c4ed4de3c6ec6
http://arxiv.org/abs/2108.01609

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A direct approach to imaging in a waveguide with perturbed geometry

Autor: Fioralba Cakoni, Shixu Meng, Liliana Borcea

Publikováno v: Journal of Computational Physics. 392:556-577

We introduce a direct, linear sampling approach to imaging in an acoustic waveguide with sound hard walls. The waveguide terminates at one end and has unknown geometry due to compactly supported wall deformations. The goal of imaging is to determine

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::336e597b6c6db316fd1abf021615098a
https://doi.org/10.1016/j.jcp.2019.04.072

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Onset of energy equipartition among surface and body waves

Autor: K. Slna, Liliana Borcea, Josselin Garnier

Publikováno v: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Royal Society, The, 2021, 477 (2246), pp.20200775. ⟨10.1098/rspa.2020.0775⟩
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2021, 477 (2246), pp.20200775. ⟨10.1098/rspa.2020.0775⟩

International audience; We derive a radiative transfer equation that accountsfor coupling from surface waves to body waves and the other way around. The model is the acoustic wave equation in a two-dimensional waveguide with reflecting boundary. The

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a9c254514d0d53b68899b7399d2becd
https://hal.archives-ouvertes.fr/hal-03147615

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Imaging in Random Media by Two-Point Coherent Interferometry

Autor: Liliana Borcea, Josselin Garnier

Publikováno v: SIAM Journal on Imaging Sciences
SIAM Journal on Imaging Sciences, Society for Industrial and Applied Mathematics, 2021, 14 (4), pp.1635-1668. ⟨10.1137/21M142068X⟩
SIAM Journal on Imaging Sciences, 2021, 14 (4), pp.1635-1668. ⟨10.1137/21M142068X⟩

This paper considers wave-based imaging through a heterogeneous (random) scattering medium. The goal is to estimate the support of the reflectivity function of a remote scene from measurements of the backscattered wave field. The proposed imaging met

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ace397963edd65d3a611bedd2d973ff0
https://hal.archives-ouvertes.fr/hal-03510682

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Incoherent source localization in random acoustic waveguides

Autor: Liliana Borcea, E. Karasmani, Chrysoula Tsogka

Publikováno v: Waves in Random and Complex Media, vol 30, iss 1
WAVES IN RANDOM AND COMPLEX MEDIA, vol 30, iss 1

We consider the problem of localizing one or more sources in a two-dimensional waveguide with horizontal flat boundaries and random sound speed fluctuations. Our data are the acoustic press...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d006a4a2c0d04feb30b23f38336bcf9c
https://escholarship.org/uc/item/0zx338j4

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