840 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade Federal Rural de PernambucoBR89 papers
- Universidade Federal da ParaíbaBR67 papers
- Universidade Federal de AlagoasBR44 papers
- Universidade Federal de Santa MariaBR41 papers
- Universidade de São PauloBR37 papers
- Centre National de la Recherche ScientifiqueFR34 papers
- University of CalgaryCA31 papers
- Universidade de PernambucoBR26 papers
- University of AkronUS21 papers
- Universidade Federal do Rio Grande do NorteBR19 papers
- École de Technologie SupérieureCA17 papers
- Universidade Estadual de Campinas (UNICAMP)BR17 papers
78 papers · 1 filter
A simple light-trapping device from a hyperbolic metamaterial on a catenoid
Frankbelson dos Santos Azevedo, José Diêgo M. de Lima, Antônio de Pádua Santos +2
By using both ray and wave optics, we show that a simple device which consists on a film of hyperbolic metamaterial on the surface of a catenoid can be used to trap light. From the…
Multi-Cue Adaptive Emotion Recognition Network
Willams Costa, David Macêdo, Cleber Zanchettin +2
Expressing and identifying emotions through facial and physical expressions is a significant part of social interaction. Emotion recognition is an essential task in computer vision…
UrbanRama: Navigating Cities in Virtual Reality
Shaoyu Chen, Fabio Miranda, Nivan Ferreira +8
Exploring large virtual environments, such as cities, is a central task in several domains, such as gaming and urban planning. VR systems can greatly help this task by providing an…
Multistability, intermittency and hybrid transitions in social contagion models on hypergraphs
Guilherme Ferraz de Arruda, Giovanni Petri, Pablo Martín Rodriguez +1
Although ubiquitous, interactions of groups of individuals (e.g., modern messaging applications, group meetings, or even a parliament discussion) are not yet thoroughly studied. Fr…
Label noise detection under the Noise at Random model with ensemble filters
Kecia G. Moura, Ricardo B. C. Prudêncio, George D. C. Cavalcanti
Label noise detection has been widely studied in Machine Learning because of its importance in improving training data quality. Satisfactory noise detection has been achieved by ad…
Non-negative Ricci curvature and Minimal graphs with linear growth
Giulio Colombo, Eddygledson Souza Gama, Luciano Mari +1
We study minimal graphs with linear growth on complete manifolds with . Under the further assumption that the -th Ricci curvature in radial directi…
Internal nonlinear transmission in an Yb mode-locked fiber laser through bifurcations
Cecília L. A. V. Campos, Lucas B. A. Mélo, Hugo L. D. de S. Cavalcante +2
Mode-locked fiber lasers are rich dynamical systems that may present several different types of pulsed operating modes, depending on external control parameters such as pump power.…
Tailoring High-Frequency Magnonics in Monolayer Chromium Trihalides
Raí M. Menezes, Denis Šabani, Cihan Bacaksiz +2
Monolayer chromium trihalides, the archetypal two dimensional (2D) magnetic materials, are readily suggested as a promising platform for high frequency magnonics. Here we detail th…
Low-complexity Rounded KLT Approximation for Image Compression
A. P. Radünz, F. M. Bayer, R. J. Cintra
The Karhunen-Loève transform (KLT) is often used for data decorrelation and dimensionality reduction. Because its computation depends on the matrix of covariances of the input sign…
Data-independent Low-complexity KLT Approximations for Image and Video Coding
A. P. Radünz, T. L. T. da Silveira, F. M. Bayer +1
The Karhunen-Loève transform (KLT) is often used for data decorrelation and dimensionality reduction. The KLT is able to optimally retain the signal energy in only few transform co…
Multifractal Magnetoconductance Fluctuations in Mesoscopic Systems
N. L. Pessoa, A. L. R. Barbosa, G. L. Vasconcelos +1
We perform a multifractal detrended fluctuation analysis of the magnetoconductance data of two standard types of mesoscopic systems: a disordered nanowire and a ballistic chaotic b…
On the Hydrogen Atom in the Holographic Universe
S. Jalalzadeh, S. Abarghouei Nejad, P. V. Moniz
We investigate the holographic bound utilizing a homogeneous, isotropic, and non-relativistic neutral hydrogen gas present in the de Sitter space. Concretely, we propose to employ…
Harmonic oscillator kicked by spin measurements: a Floquet-like system without classical analogous
Bento Montenegro, Nadja K. Bernardes, Fernando Parisio
We present a kicked harmonic oscillator where the impulsive driving is provided by stroboscopic measurements on an ancillary degree of freedom and not by the canonical quantization…
Low-rank quantum state preparation
Israel F. Araujo, Carsten Blank, Ismael C. S. Araújo +1
Ubiquitous in quantum computing is the step to encode data into a quantum state. This process is called quantum state preparation, and its complexity for non-structured data is exp…
Approximating Invertible Maps by Recovery Channels: Optimality and an Application to Non-Markovian Dynamics
Lea Lautenbacher, Fernando de Melo, Nadja K. Bernardes
We investigate the problem of reversing quantum dynamics, specifically via optimal Petz recovery maps. We focus on typical decoherence channels, such as dephasing, depolarizing and…
Transportation Scenario Planning with Graph Neural Networks
Ana Alice Peregrino, Soham Pradhan, Zhicheng Liu +2
Providing efficient human mobility services and infrastructure is one of the major concerns of most mid-sized to large cities around the world. A proper understanding of the dynami…
On the Deduction of the Carathéodory's Axiom of the Second Law of Thermodynamics from the Clausius and Kelvin Principles
Pedro F. da Silva Júnior
Carathéodory's formalism for classical thermodynamics is a rich alternative approach to this theory, although unpopular with students and physics professors. This approach dispense…
Evaluating Code Readability and Legibility: An Examination of Human-centric Studies
Delano Oliveira, Reydne Bruno, Fernanda Madeiral +1
Reading code is an essential activity in software maintenance and evolution. Several studies with human subjects have investigated how different factors, such as the employed progr…
Control of Kawahara equation with overdetermination condition: The unbounded cases
Roberto de A. Capistrano Filho, Luan S. de Sousa, Fernando A. Gallego
In this manuscript we consider the internal control problem for the fifth order KdV type equation, commonly called the Kawahara equation, on unbounded domains. Precisely, under cer…
On the control issues for higher-order nonlinear dispersive equations on the circle
Roberto de A. Capistrano-Filho, Chulkwang Kwak, Francisco J. Vielma Leal
The local and global control results for a general higher-order KdV-type operator posed on the unit circle are presented. Using spectral analysis, we are able to prove local result…
Controllability for Schrödinger type system with mixed dispersion on compact star graphs
Roberto de A. Capistrano-Filho, Márcio Cavalcante, Fernando Gallego
In this work we are concerned with solutions to the linear Schrödinger type system with mixed dispersion, the so-called biharmonic Schrödinger equation. Precisely, we are able to p…
Stochastic rumors on random trees
Valdivino V. Junior, Pablo M. Rodriguez, Adalto Speroto
The Maki-Thompson rumor model is defined by assuming that a population represented by a graph is subdivided into three classes of individuals; namely, ignorants, spreaders and stif…
Meta-aprendizado para otimizacao de parametros de redes neurais
Tarsicio Lucas, Teresa Ludermir, Ricardo Prudencio +1
The optimization of Artificial Neural Networks (ANNs) is an important task to the success of using these models in real-world applications. The solutions adopted to this task are e…
Scalar/Dirac perturbations of the Reissner-Nordström black hole and Painlevé transcendents
João Paulo Cavalcante, Bruno Carneiro da Cunha
We investigate spin- and spin- perturbations for non-extremal and extremal Reissner-Nordström backgrounds using the isomonodromic method. We calculate the fundament…