Telecommunication System
Mostrando 1-12 de 56 artigos, teses e dissertações.
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1. Analytical determination of the vibration frequencies and buckling loads of slender reinforced concrete towers
Abstract This study focused on improving the design of slender structures with reinforced concrete (RC) telecommunication towers as the main application. Analytical procedure based on Rayleigh’s method to compute the first natural vibration frequency and the critical buckling load was development. All the nonlinearities present in the system were considere
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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2. Study and Optimization of Raman Amplifiers in Tellurite-Based Optical Fibers for Wide-Band Telecommunication Systems
Abstract Here we present a numerical analysis and the optimization of a multi-pump discrete Raman amplification system based on the use of a Tellurite optical fiber as the gain media. By using previously reported optimization techniques we were able to exploit the high Raman gain of Tellurite optical fibers and its multipeak spectrum to achieve amplification
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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3. Estudo comparativo de métodos para calcular pontos ionosféricos e descrever o trajeto do sinal GNSS
Resumo: Muitos esforços foram feitos nas últimas décadas para aprimorar a formulação de modelos ionosféricos baseados em dados derivados do Global Navigation Satellite System (GNSS). No entanto, apesar de significativos avanços na estimação da densidade eletrônica contida no trajeto do sinal GNSS, pouca atenção vem sendo dada à precisão geomét
Bol. Ciênc. Geod.. Publicado em: 2017-12
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4. 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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5. Numerical Simulations to Assess ART and MART Performance for Ionospheric Tomography of Chapman Profiles
ABSTRACT The incomplete geometrical coverage of the Global Navigation Satellite System (GNSS) makes the ionospheric tomographic system an ill-conditioned problem for ionospheric imaging. In order to detect the principal limitations of the ill-conditioned tomographic solutions, numerical simulations of the ionosphere are under constant investigation. In this
An. Acad. Bras. Ciênc.. Publicado em: 31/07/2017
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6. Modelo distribuído para agregação de armazenamento em redes de sensores sem fio=Distributed model for storage aggregation in wireless sensor networks / Distributed model for storage aggregation in wireless sensor networks
Storage management of Wireless Sensor Networks (WSN) is a very critical issue in terms of system s lifetime. While WSNs host a vast storage capacity on the aggregate, that capacity cannot be used entirely. Eventually, the entire network may fail when the first sensor has its own storage capacity depleted, leaving behind a large amount of unutilized storage c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2011
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7. NCL-INSPECTOR. UMA FERRAMENTA PARA INSPEÇÃO DE APLICAÇÕES NCL / NCL INSPECTOR. A NCL CODE INSPECTION TOOL
Ginga-NCL and the NCL language were selected as a recommendation as the interactive multimedia environment and language for IPTV by the International Telecommunication Union (ITU). In order to promote the use of these technologies, it is necessary to create tools to help developing applications using NCL. At present, the support provided by tools for NCL dev
Publicado em: 2010
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8. Identificação dos parâmetros necessários para análise de rede de estrutura múltipla com base na análise por simulação de fluxo TCP por vazão de fluidos
The major worldwide operators of transport in telecommunication networks have sought tools that, together with traffic statistics, allow their infrastructure to be enabled such that there is no rejection or delay of traffic due to transport capacity. Observing a private network with a considerable geographic size and, for a private high-density network with
Publicado em: 2010
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9. Estimation of the interval availability for protected optical connections for SLA formulation / Estimação da disponibilidade de intervalo em conexões opticas protegidas para a formulação de SLAs
The relation between telecommunication system operators and their customers is guided by a service level agreement (SLA) set by both sides, and the non-attendance to some clauses is punishable by a fine. Among the responsibilities set out in this agreement, usually, availability is considered, once that to the customers what matters are warranties that their
Publicado em: 2009
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10. IPTV architecture with time-shift support based on peer-to-peer distribution. / Arquitetura de IPTV com suporte à apresentação deslocada no tempo baseada em distribuição peer-to-peer.
Telecommunication companies are suffering from the increasing offer of cheap and reliable voice over IP services, being forced to diversify their services looking for new revenue possibilities. Since these companies have a vast infrastructure, they are now providing TV services through the same telephony and data infrastructure, using their IP networks to of
Publicado em: 2009
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11. Fault detection in communication systems / Detecção de falhas em sistemas de comunicações
The present work is focused in the area of fault detection in communications systems using billing tickets archives as base of information. In most of the cases, these archives are used by the telecommunication carriers only for billing purposes. The thesis presents algorithms for fault detection and consequence alarms generation. The algorithms are analyzed
Publicado em: 2008
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12. Microrregional single frequency network / Redes de freqüência única microrregionais
In broad terms, this work suggests a new premise for the planning of channels of digital TV that focuses on optimizing spectrum. It made a contextualization on the decrees, laws and regulations concerning the Digital TV in Brazil. It presents the most relevant technical aspects of the Brazilian System of Digital Terrestrial Television (SBTVD-T), particularly
Publicado em: 2008