Radio Systems
Mostrando 1-12 de 144 artigos, teses e dissertações.
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1. Single Port Multimode Reconfigurable UWB-NB Antenna for Cognitive Radio Applications
Abstract In this paper, a compact, single port, multimode reconfigurable UWB-NB antenna with a novel feeding network is presented. The proposed antenna consists of a pentagonal-shaped monopole radiator, a beveled-shaped partial defected ground plane with a rectangular slot, and a reconfigurable bypass feeding network. The antenna realizes a wideband frequenc
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Multi-Step-Ahead Spectrum Prediction for Cognitive Radio in Fading Scenarios
Abstract This paper analyzes multi-step-ahead spectrum prediction for Cognitive Radio (CR) systems using several future states. A slot-based scenario is used, and prediction is based on the Support Vector Machine (SVM) algorithm. The aim is to determine whether multi-step-ahead spectrum prediction has gains in terms of reduced channel-switching and increased
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-12
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3. Fish news: perceptual skills, technique and distributed cognition in mullet fishing
Resumo Apresenta-se uma investigação sobre percepção, técnica, e cognição distribuída envolvendo coletivos de pescadores e peixes durante temporadas de pesca da tainha, no litoral de Santa Catarina, sul do Brasil. Discute-se o engajamento das técnicas de pesquisa, envolvendo a produção de imagens e sons, com as técnicas corporais e cadeias operat
Vibrant, Virtual Braz. Anthr.. Publicado em: 28/11/2019
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4. Vegetation Image as Bayesian Predictor for Radio Propagation in Complex Environments Using Unscented Transform
Abstract Vegetation is considered a complex environment for analysis of scattering and attenuation in radio propagation phenomena. Satellite image processing can improve planning of radio systems with a vegetation attenuation predictor. In this research, the prediction is based on the correlation of more than 56% between RGB pixel values and vegetation atten
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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5. ELECTRONIC MONITORING SYSTEM FOR MEASURING HEART RATE AND SKIN TEMPERATURE IN SMALL RUMINANTS
Abstract The electronic monitoring of physiological responses is essential for managing animal production systems considering market demands for animal welfare. The objective of this study was to design, build, and test an electronic monitoring system, with recording and wireless transmission capability, for measuring the heart rate and skin temperature in s
Eng. Agríc.. Publicado em: 2018-04
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6. Study of Coffee Grounds Oil Action in PVC Matrix Exposed to Gamma Radiation: Comparison of Systems in Film and Specimen Forms
The poly (vinyl chloride), PVC, undergoes changes in its physicochemical properties when it is exposed to gamma radiation. Thus, the radiolytic stabilization of PVC is one way for obtain a material with radiation resistance. In this work, we studied the coffee grounds oil as PVC radiolytic protection in two systems forms: PVC film and PVC specimen. The syste
Mat. Res.. Publicado em: 18/12/2017
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7. Heuristics for the optimized deployment of small cells in next-generation networks
Abstract Heterogeneous Networks (HetNets) have been introduced as an alternative means of improving the overall network capacity. However, HetNets increase the complexity and cost of transport due to the large number of smallcells (SCs) that have to be connected, and hence, it is essential to investigate the best way to plan the joint deployment of radio and
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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8. Wireless microsystems for biomedical applications
This paper presents a review with the state-of-the-art of wireless microsystems for biomedical applications. Aspects including the radio-frequency systems, data acquisition, application specificities (especially those in the context of implantable devices), power consumption and issues associated to their integration are presented. A review of COTS (Commerci
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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9. Marabaixo, ladrão, gengibirra e rádio: traduções de linguagens de textos culturais
Men, women and children movements decorating the flagpole, it was Holy Spirit Saturday, boxes, players, women, flowery, swirly skirts, thief etc., drinking ginger beer, purifying the throat for taking the thief. The host offered soup, energy for the revelry. This is marabaixo, the main cultural expression of Amapá, originated from the different relations of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2012
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10. Arquitetura escalável de alto desempenho para atualização, acesso e recuperação de informações em bancos de dados de aplicações embarcadas
O gerenciamento remoto de múltiplos sistemas tais como máquinas operatrizes, veículos, aviões, dentre outros, demanda um fluxo bastante intenso de dados entre eles e o sistema gerenciador. Pesquisas têm sido desenvolvidas na concepção e implementação de arquiteturas escaláveis que atendam essas demandas levando a questões interessantes de desempen
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2012
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11. Metodologia para aplicação de RFID em automação : estudo de caso em um sistema de gestão / Methodology for RFID implementation in automation : case study in a management system
Radio-frequency identification (RFID) is an emerging technology with enormous potential for application. It can be used where there is a need to identify distant objects, wirelessly, with data transmission via radio signals, followed by its storage and process on computer systems, making them available for future use. As its applications permeates many busin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/07/2012
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12. As estações rádio base na cidade de São Paulo: uma aboradagem sobre os riscos e uma contribuição para os sistemas de gerenciamento / RADIO BASE STATIONS IN THE CITY OF SÃO PAULO: a discussion of risks and a contribution to the management systems
O desenvolvimento da tecnologia de telecomunicação móvel ensejou a implantação massiva de ERBs (Estações rádio base) para o atendimento da crescente demanda ocorrida na última década. As ERBs, por sua vez, constituem fontes emissoras de radiação não ionizante. Os estudos científicos concluídos nos últimos anos indicam que a exposição à rad
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/06/2012