A5060125158- Advanced DC-DC Converters
- GaN-based semiconductor devices and materials
- Impact of Light on Environment and Health
- Multilevel Inverters and Converters
- Silicon Carbide Semiconductor Technologies
- Optical Wireless Communication Technologies
- Semiconductor Lasers and Optical Devices
- Wireless Power Transfer Systems
- Power Line Communications and Noise
- Traffic control and management
- Transportation Planning and Optimization
- Mobile Agent-Based Network Management
- Mosquito-borne diseases and control
- solar cell performance optimization
- Microgrid Control and Optimization
- Zoonotic diseases and public health
- Advanced Battery Technologies Research
- Semiconductor materials and devices
- Real-time simulation and control systems
- Power Quality and Harmonics
- Electromagnetic Compatibility and Noise Suppression
- Advancements in Semiconductor Devices and Circuit Design
- Water Systems and Optimization
- Multi-Agent Systems and Negotiation
- Vehicular Ad Hoc Networks (VANETs)
Universidade Federal de Viçosa
2024-2025
Universidade Federal de Juiz de Fora
2015-2024
King Abdullah University of Science and Technology
2024
Universidade Federal de Santa Maria
2024
Universidade Federal do Rio Grande do Sul
2023
Fundação Carlos Chagas
2023
Universidade Federal de Santa Catarina
2022
University of Coimbra
1999-2020
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2020
Universidade Federal do Recôncavo da Bahia
2019
Este artigo tem como objetivo analisar as dinâmicas da desinformação que circula nas redes sociais sobre universidades a fim de identificar os métodos utilizados (Melquiades Silva; Valadares Cendón, 2022). Para tal, partimos seguinte questão: quais são empregados relacionadas às universidades? Nesse sentido, delimitamos nosso corpus para desinformações checadas por duas agências fact-checking – Lupa e Boatos.org no período janeiro 2018 novembro 2023. Assim, este estudo, selecionou-se 4...
This work deals with the analysis and photometric comparison between different systems concepts for public lighting, hence solid state lighting (SSL) employing LED luminaires electronic drivers conventional high pressure sodium (HPS) lamp based along electromagnetic ballasts. The study raise question on relative perception of human eye to light sources spectral distributions, devoting special attention low luminance conditions (scotopic) such as those present roadway lighting. Different...
In this work, a new topology of integrated converter is proposed to be used as an off-line LED driver. The two stages the are made up by front-end SEPIC power factor corrector and buck-boost for current regulation, both sharing same switch. It demonstrated that when work in DCM, less low-frequency ripple transmitted from bus capacitor output, allowing decreasing amount filtering needed eliminating electrolytic capacitors circuitry. Photometric data size maximum permissible at LEDs, further...
This study proposes a novel approach for low-frequency output current ripple minimization in offline light-emitting diode (LED) drivers. strategy is based on the large-signal modulation of LED converter duty-cycle so that can be reduced and, consequently, required filtering capacitances somehow decreased. technique devised to used converters which single control loop employed, such as integrated converters, where responsible while maintaining high power factor at input (mains). The change...
Esta pesquisa tem como objetivo analisar a abordagem utilizada pela plataforma Geekie One para o ensino de língua espanhola, por meio das atividades, sob perspectiva da complexidade. Para tanto, partimos seguinte questão: De que forma ocorre espanhola na One, complexidade? À luz teoria complexidade, observamos uma língua, considerado aqui um sistema adaptativo complexo, envolve série fatores (agentes) interagem dinâmica e aleatória (Larsen-Freeman, 1997). Entre esses fatores, destacam-se uso...
Traffic congestion affects not only the economic activity of cities but is also responsible for air quality and global warming problems. The employment electric buses in metropolitan transportation as an alternative to internal combustion engine appears be a promising eco-sustainable solution. However, important aspect evaluating performance adequateness such vehicles fact they are immersed urban context. This work follows HLA-based distributed architecture bus powertrain simulation within...
This paper presents the study of an offline flyback-based light-emitting diode (LED) driver with reduced storage capacitance. An approach called active ripple compensation was used for minimizing converter bulk technique is oriented to voltage-controlled pulse width modulation converters and based on duty cycle, which allows reduction filtering capacitance by increasing harmonic content input current up limits established standards. By means design procedure presented in this paper, amount...
This paper proposes a visible light communication (VLC) system consisting of single-stage buck- boost power factor correction converter operating in the discontinuous conduction mode with dimming capability. Additionally, this ON-OFF M-frequency shift keying modulation for VLC system. allows transmission more than single bit each switching period without affecting characteristics light-emitting diode luminaire. The design whole is discussed detail, including both transmitter and receiver...
This work proposes an off-line LED driver, based on the Cuk converter operating in discontinuous conduction mode. Complete analysis of is carried out and a design methodology presented, focused reducing output filtering capacitance, still achieving acceptable current ripple eliminating need for electrolytic capacitors. Photometric data gathered fed into order to optimize selection capacitor reduction. Experimental results were obtained from high power factor efficiency prototype feeding 56...
Smart lighting applications are designed to provide management and control of the whole interconnected system, ensuring reliability, cost saving high efficiency. In this work is proposed a simple intelligent module be connected in street system order simultaneously measure lamp's parameters. All data transmission procedure was developed based on mesh network topology. By taking advantage communication structure used for smart coupling sensors module, it's possible gather regarding power grid...
In this paper, we enhanced the capability of Aimsun simulation including signal timing optimization traffic control with real-time information on network dynamics. The problem is formulated so as to find duration maximum green time for each stage in response recurrent flow fluctuation at an intersection. approach used a simple version Webster method determining cycle length and split. resulting algorithm was coded Java TraSMAPI dynamically link it Aimsun's API, which allows user change...
This paper focuses on the problem of driving parallel strings LEDs while ensuring current equalization between them. issue is addressed in terms proposing a small and simple linear topology that can be used number series-associated LEDs, working as constant source for each string. Such employs four-component circuit, with low dependence transistor parameters, easy repeatability good regulation. Mathematical description circuit experimental results are provided.
In this work, an off-line flyback converter with PWM dimming function employing a single active power switch is proposed for LED lighting. The slightly modified topology which enables the main to be used both factor correction and high-frequency constant peak current on LEDs, in order conserve chromatic characteristics of light emitted. control scheme uses duty-cycle level, while switching frequency varied along adjust input level maintain LEDs. Mathematical description, simulation...
Abstract Despite the considerable morbidity and mortality of Yellow fever virus (YFV) infections in Brazil, as well its widespread presence non-human primate host, our understanding disease outbreaks is hampered by limited viral genomic data. Determining timing spatial corridors YFV spread, geographic hotspots that link endemic north country with epidemic extra-Amazonian regions, are central to predicting preventing future outbreak events epidemics. Here, we tracked recent spread integrating...
Mobile code is a promising model for distributed computing and it has been exploited in several areas of applications. One the that may benefit from use mobile agent technology parallel processing. This paper describes Java-based platform, called JAMES, provides support computing. We have implemented software module supports well-known master/worker we some tasks. present experimental results compare with usual migratory agents. Then, agents two other solutions computing: MPI JET. The are...