Data Network Communications
Mostrando 1-12 de 37 artigos, teses e dissertações.
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1. MIMO-PLC Communications in an Experimental Medium Voltage Network: Measurement and Analysis
Abstract This paper presents measurements at a mock-up medium voltage network to verify the feasibility of Broadband Power Line Communication (BPLC). We use the data extracted within the frequency range 2 − 30 MHz to characterize a MIMO PLC network using different phase combinations, defining the best and worst use case scenarios. The empirical data shows
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. A Performance Evaluation of WLAN-Femtocell-LTE beyond the Capacity Crunch. Does Femtocell have to overcome WLAN or can they coexist in HetNets?
Abstract This paper originates from a practical experiment based on Mesh Networks. The promising results obtained from this experiment prompted us to discuss in greater depth whether Wireless Local Area Networks (WLAN) are still useful for current communications. This means that on the one hand femtocells can be defined as small base stations that use the sa
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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3. Estudos de sistemas OFDM para comunicações ópticas / Studies OFDM systems for optical communications
The development of digital modulation formats in optical communications systems is considered to be a promising way to increase the spectral efficiency and to combat the effects of signal degradation in optical fiber without changing the infrastructure already deployed. In this context, the technique called OFDM (orthogonal frequency division multiplexing) e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/10/2012
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4. O trabalho do assistente social no contexto hospitalar: uma análise na perspectiva do trabalho em equipe
This thesis constitutes a qualitative study about the work involved in the social worker in the hospital, and is anchored in research that is based on the theory and historical-dialectical materialist method. The problem part of the following research question: "how the social workers to the hospital system develop its work in teams where they live?" In orde
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/01/2012
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5. Sistema de comunicação de dados pela rede elétrica, de baixo custo, aplicado a uma rede de medidores individuais de energia elétrica residencial : concepção do circuito, protótipo e testes / Communication system to the AC power, low cost, applied to a network of individual meters for residential electricity, circuit design, prototyping and testing
Este trabalho é parte de um projeto de pesquisa e desenvolvimento de uma rede de mini-medidores de energia, de baixíssimo custo, que se comunica com uma central, que armazena todas as informações relativas ao consumo de energia elétrica, de cada um dos pontos de consumo de uma residência. Ao fim de um período, fornece ao consumidor condições de anal
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/10/2011
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6. Estratégias de controle dinâmico de caminhos ópticos sobre redes fotônicas WDM utilizando inteligência de enxame. / Strategies for dynamic lightpath control in WDM photonic networks using swarm intelligence.
A fundamental aspect of photonic networks based on wavelength division multiplexing (WDM) technology is the control of optical paths. An optical path, or lightpath, is a purely optical connection established between two network nodes, which can pass through several intermediate nodes. To efficiently support the demands required from a WDM network that runs h
Publicado em: 2011
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7. Uma arquitetura de comunicação oportunística
Mobile computing devices often present high processing power and include several wireless network interfaces. 4G networks promise to provide a unified IP based infrastructure with QoS and security support for the communications using such devices. Transmission delays, and network disruptions, however, are often common when considering the current transmissio
Publicado em: 2010
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8. Specification of a data processing core for an optical burst switching network / Especificação do nucleo de processamento para rede de chaveamento de rajadas opticas
Este trabalho apresenta as especificações arquitetônicas e funcionais de uma rede ótica avançada, fundamentada na comutação óptica de rajadas e que objetiva um melhor aproveitamento dos enlaces ópticos e a redução do gargalo eletrônico decorrente das conversões eletro-ópticas. Uma proposta de concepção do núcleo de processamento de dados bas
Publicado em: 2009
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9. Estimativa do número de estações de rádio base para a implantação do WIMAX no Distrito Federal
During the past years, the video, voice and data services available in the fixed communications networks have been requested by users in mobility. This fact has motivated the development of technologies that allow traffic of a lot of information in cellular telephone networks. WiMAX e UMTS are technologies that can help the traffic flow. The WiMAX, known as
Publicado em: 2009
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10. Protocolo ISO 11783: procedimentos para comunicação serial de dados do controlador de tarefa / ISO 11783 protocol: procedures for serial data communication with the task controller
The recent growth of automation technology and embedded electronic in agricultural machinery has established a new practice in agriculture. These new practices related to precision agriculture (PA) have demanded the use of sensors and communications embedded networks for data acquisition and control devices in the farm field. The incompatibility between hard
Publicado em: 2009
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11. Strategy of monitoring and automation in irrigation systems using communication devices in wireless sensor network / Estratégia de monitoramento e automação em sistemas de irrigação utilizando dispositivos de comunicação em redes de sensores sem fio
The goal of this study was to develop strategies for monitoring and automated irrigation systems using FDR capacitance sensors to collect data of water content in the soil through Wireless Sensor Network (WSN). The FDR capacitance sensors were developed in the Department of Agricultural Engineering (DENA) pertain UFC. Were used 14 FDR capacitance sensors and
Publicado em: 2009
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12. FATORES SOCIODEMOGRÁFICOS E CLÍNICOS DE INTERNAÇÕES PSIQUIÁTRICAS VOLUNTÁRIAS E INVOLUNTÁRIAS EM FORTALEZA CEARÁ FORTALEZA - CEARÁ 2009
The objective of this research is to evaluate social-demographic and clinical factors of involuntary psychiatric internments (IPI s) and voluntary (VPI s), in psychiatric hospitals, arrangements with the Unified Health System (SUS), Fortaleza, Ceará, in 2007. This is a case study, of transversal nature, with use of documents, which studied the descriptive a
Publicado em: 2009