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De-Equivariantization of Hopf Algebras
(Springer, 2014-02)
We study the de-equivariantization of a Hopf algebra by an affine group scheme and we apply Tannakian techniques in order to realize it as the tensor category of comodules over a coquasi-bialgebra. As an application we ...
Comparison of industrial tomography algorithms for gamma scanning 2-D reconstruction
(International Society for Industrial Process Tomography, 2020)
Algebraic Reconstruction of Source and Attenuation in SPECT Using First Scattering Measurements
(Springer, 2018)
Here we present an Algebraic Reconstruction Technique (ART) for solving the identification problem in Single Photon Emission Computed Tomography (SPECT). Traditional reconstruction for SPECT is done by finding the radiation ...
Ionospheric tomography using GNSS: multiplicative algebraic reconstruction technique applied to the area of Brazil
(2016-10-01)
Experimental analysis was performed using multiplicative algebraic reconstruction technique (MART) to map the ionosphere over Brazil. Code and phase observations from the global navigation satellite system (GNSS) together ...
A row-action alternative to the EM algorithm for maximizing likelihoods in emission tomography
(Ieee-inst Electrical Electronics Engineers IncNew York, 1996)
Tomographic imaging of ionospheric plasma bubbles based on GNSS and radio occultation measurements
(2018-10-01)
Total electron content measurements given by the global navigation satellite system (GNSS) have successfully presented results to capture the signatures of equatorial plasma bubbles. In contrast, the correct reproduction ...
A New Method for Ionospheric Tomography and Its Assessment by Ionosonde Electron Density, GPS TEC, and Single-Frequency PPP
(Ieee-inst Electrical Electronics Engineers Inc, 2019-05-01)
A new tomographic method was developed with the main goal of mapping the ionosphere in the region of Brazil. The ionospheric background was estimated based on ionosonde and radio-occultation measurements to overcome the ...
Reconstrução tomográfica de imagens utilizando técnicas POCS seqüenciais e paralelas.
(Universidade Federal de São CarlosBRUFSCarPrograma de Pós-Graduação em Ciência da Computação - PPGCC, 2001-08-31)
In this dissertation four algorithms are presented for the tomographic reconstruction of images using methods denominated POCS - Projections onto Convex Sets, which are the ART - Algebraic Reconstruction Technique, the ...
Parametric Curve Reconstruction from Point Clouds using Minimization Techniques
(SCITEPRESS, 2013)
Smooth (C1-, C2-,...) curve reconstruction from noisy point samples is central to reverse engineering, medical imaging, etc -- Unresolved issues in this problem are (1) high computational expenses, (2) presence of artifacts ...
A m-dimensional stochastic estimatorA m-dimensional stochastic estimator
(Revista Mexicana de Física, 2012)