RSS 1.0Departamento de Estatística, Matemática Aplicada e Computação
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Recent Submissions
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Guidelines for the Application of Data Mining to the Problem of School Dropout
de Carvalho, Veronica Oliveira
; ; de Sousa, Leandro Rondado ; Affonso, Frank José (Communications in Computer and Information Science, 2022) [Trabalho apresentado em evento]
Dropout is a complex phenomenon based on interrelated factors such as personal, institutional, structural, sociocultural, among other ones. It represents a waste of resources for students, their families, schools and ... -
Single-averaged model for analysis of frozen orbits around planets and moons
; Yokoyama, Tadashi; Mourão, Daniela C. (Celestial Mechanics and Dynamical Astronomy, 2022) [Artigo]
Let us consider the restricted three-body problem. Analysis of the orbital motion of a spacecraft around planets or moons is presented taking into account the nonsphericity of the primaries and the perturbations coming ... -
On the reduction of nonlinear electromechanical systems
; ; ; ; Balthazar, José Manoel (Meccanica, 2022) [Artigo]
The present work revisits the reduction of the nonlinear dynamics of an electromechanical system through a quasi-steady state hypothesis, discussing the fundamental aspects of this type of approach and clarifying some ... -
COVID-19 detection on Chest X-ray images: A comparison of CNN architectures and ensembles[Formula presented]
Breve, Fabricio Aparecido (Expert Systems with Applications, 2022) [Artigo]
COVID-19 quickly became a global pandemic after only four months of its first detection. It is crucial to detect this disease as soon as possible to decrease its spread. The use of chest X-ray (CXR) images became an effective ... -
RaDE+: A semantic rank-based graph embedding algorithm
de Fernando, Filipe Alves; Pedronette, Daniel Carlos Guimarães ; de Sousa, Gustavo José ; Valem, Lucas Pascotti ; Guilherme, Ivan Rizzo (International Journal of Information Management Data Insights, 2022) [Artigo]
Due to the possibility of capturing complex relationships existing between nodes, many applications benefit from being modeled with graphs. However, performance issues can be observed in large-scale networks, making it ... -
Formative Context of Robotic-Mathematical Invention:Computational Thinking and Critical Mathematics
de Azevedo, Greiton Toledo; Maltempi, Marcus Vinicius ; (Bolema - Mathematics Education Bulletin, 2022) [Artigo]
In this article, we identify and understand the characteristics of a mathematics educational context in which students produce digital games and robotic devices to treat symptoms of Parkinson's disease. Using a qualitative ... -
Preface
Balthazar, Jose Manoel (Mechanisms and Machine Science, 2022) [Editorial]
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Nonlinear Control Applied in Jump Attenuation of a Non-ideal System
; Kossoski, A.; Bueno, A. M. ; Balthazar, Jose Manoel ; ; ; (Mechanisms and Machine Science, 2022) [Capítulo de livro]
This work proposes the attenuation of the Sommerfeld effect (jump phenomenon) present in a non-ideal oscillator thought the use of different nonlinear controllers. The non-ideal system is composed of a beam-like mechanical ... -
A Tutorial on the Simplification of Electromechanical Dynamic Models
; ; ; ; Balthazar, Jose Manoel (Mechanisms and Machine Science, 2022) [Capítulo de livro]
DC motors are electromechanical systems designed to convert electric power to mechanical power. Their dynamics depend on the features of the motor and the load which they move. The dynamics of the motor is influenced by ... -
A Hybrid PID-LQR Control Applied in Positioning Control of Robotic Manipulators Subject to Excitation from Non-ideal Sources
; ; ; ; Junior, J. A. G. Luz; Balthazar, Jose Manoel ; Kossoski, A. (Mechanisms and Machine Science, 2022) [Capítulo de livro]
This paper proposes the use of a hybrid controller that combines concepts of the Proportional-Integral-Derivative (PID) controller with the Linear-Quadratic-Regulator (LQR) and a Feedforward gain to control the positioning ... -
Piezoelectric Energy Harvesting from a Non-ideal Portal Frame System Including Shape Memory Alloy Effect
; ; ; ; ; Balthazar, Jose Manoel; ; (Mechanisms and Machine Science, 2022) [Capítulo de livro]
In this work, the investigation of energy harvesting for a U-frame-type (portal frame) structure is presented. The structure is considered as a composite made out of a Shape Memory Alloy (SMA), accounting for a non-ideal ... -
Nonlinear Modal Analysis of Vibrating Systems with Limited Power Supply
; ; Balthazar, Jose Manoel; (Mechanisms and Machine Science, 2022) [Capítulo de livro]
Nonlinear modal analysis is a powerful technique that allows a better understanding of the nonlinear dynamic behavior of mathematical models with few degrees of freedom. Nonlinear modes have emerged as a natural extension ... -
Dynamic Analysis and PID Control of a Double Pendulum Arm Excited by a Nonideal Source
; ; ; ; Balthazar, Jose Manoel; ; (Mechanisms and Machine Science, 2022) [Capítulo de livro]
In this paper the dynamics of a double pendulum arm coupled through a magnetic field to a nonlinear RLC based shaker circuit is presented and will be studied numerically. This kind of electromechanical system is often found ... -
Chaos Control in a Nonideal Vibrating Systems
; ; ; ; Balthazar, Jose Manoel; ; ; (Mechanisms and Machine Science, 2022) [Capítulo de livro]
This paper presents two control techniques for a non-ideal system with chaotic behavior. To place and maintain the system in a periodic orbit, the techniques of Time Delayed Feedback Control and Continuous-Delay Control ... -
A preliminary analysis of the phase Portrait's structure of a nonlinear pendulum-mechanical system using the perturbed hamiltonian formulation
; ; Balthazar, Jose Manoel (Dynamical Systems and Control, 2016) [Capítulo de livro]
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A review of new vibration issues due to non-ideal energy sources
Balthazar, J. M.; ; ; ; ; ; (Dynamical Systems and Control, 2016) [Capítulo de livro]
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Transport barriers for two modes drift wave map
Bernardi de Souza, L. F.; Egydio de Carvalho, R. ; (Physics Letters, Section A: General, Atomic and Solid State Physics, 2022) [Artigo]
Shearless barrier improves the plasma confinement and can be created by the application of a bias. Previously, they were identified with a 2D map of charged particle motion in one drift mode. Now, we add a second drift ... -
Person Re-ID through unsupervised hypergraph rank selection and fusion
Valem, Lucas Pascotti; Pedronette, Daniel Carlos Guimarães (Image and Vision Computing, 2022) [Artigo]
Person Re-ID has been gaining a lot of attention and nowadays is of fundamental importance in many camera surveillance applications. The task consists of identifying individuals across multiple cameras that have no overlapping ... -
Dropout through Extended Association Rule Netwoks: A Complementary View
Dall'Agnol, Maicon; Souza, Leandro Rondado de ; ; Carvalho, Veronica Oliveira de ; ; ; ; (Proceedings Of The 12th International Conference On Computer Supported Education (csedu), Vol 1, 2020) [Trabalho apresentado em evento]
Dropout is a critical problem that has been studied by data mining methods. The most widely used algorithm in this context is C4.5. However, the understanding of the reasons why a student dropout is a result of its ... -
Using Barrier Elision to Improve Transactional Code Generation
; ; ; Baldassin, Alexandro; (Acm Transactions On Architecture And Code Optimization, 2022) [Artigo]
With chip manufacturers such as Intel, IBM, and ARM offering native support for transactional memory in their instruction set architectures, memory transactions are on the verge of being considered a genuine application ...