Telecommunications Systems
Mostrando 13-24 de 63 artigos, teses e dissertações.
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13. Relationship between physical properties convective clouds and cloud-ground lightining / Relações das propriedades físicas das nuvens convectivas com as descargas elétricas
The knowledge of physical and microphysical properties associated to cloud-ground lightning occurrence is very important for determination of potential forecast parameters of electrical discharges activity. The identification of these parameters could give valuable contribution for different segments of society, such as the sectors of electric energy distrib
Publicado em: 2009
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14. Convergência digital e a telefonia móvel: implicações à gestão estratégica e à inovação. / Digital convergence and mobile telecommunications: Implications toward strategic management and innovation.
Telecommunications industry faces fierce competition both locally and globally, in which innovation plays a significant role for companies competitiveness and prosperity. In addition, a variety of technological solutions brings up uncertainty about users embracing to new technologies and about businesses models profitability. One element that enables mobile
Publicado em: 2008
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15. MÃtodos justos de alocaÃÃo dinÃmica de recursos em sistemas de transmissÃo baseados em OFDM com modulaÃÃo adaptativa
The growth of the telecommunications systems utilization and the introduction of the Third Generation Cell-Phone technologies motivate the industry to search for new alternatives to manage the traditional radio infrastructure, allowing so the offering of new business models and applications. In order to satisfactorily supply the demand generated this growth,
Publicado em: 2008
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16. Criptografia quântica em redes de informação crítica - aplicação a telecomunicações aeronáuticas. / Quantum cryptography in critical information networks - application to aeronautical telecommunications.
The importance of security maintenance in critical information networks has been rising in recent times. Over the past decades, the utilization of cryptography tools, mainly those based on computationally intractable problems, was enough to ensure the security of communications systems. The development of the new information processing technique known as qua
Publicado em: 2008
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17. Call center own or outsourced : comparative using systems dynamics / Call center próprio ou terceirizado : comparações utilizando simulações com sistemas dinâmicos
It is increasingly evident the need for companies to seek closer to its customers, due to fierce competition and challenges ahead to technological changes. One such challenge is the relationship between company and customers, whose number grew as much as the provision of products and competition. And one of the ways advanced to operationalise this relationsh
Publicado em: 2008
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18. Particionamento Temporal Acoplado a Escolha de Componentes para AplicaÃÃes de ComputaÃÃo ReconfigurÃvel
Publicado em: 2008
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19. Longa distância : a evolução dos sistemas nacionais de telecomunicações da Argentina e do Brasil em conexão com as telecomunicações internacionais (1808-2003)
This dissertation sustains that, in broad lines, telecommunications have gone through three large historical phases since its beginning, little more than 200 years ago. After a pre-history where technologies were developed with governmental support or control, telecommunication services were commercially exploited in a competitive manner, virtually without s
Publicado em: 2007
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20. Aplicação de modelos de engenharia para a identificação dos custos de universalização nas telecomunicações / Aplication of engineering models for universalization costs identification in telecommunications
This study presents a methodology to calculate the net costs resulting from telecommunications universal services, in accordance with Brazilian legislation. Such a concept is based on the estimation of the avoidable costs due to universal obligations. In order to proceed with the calculations, the costs attributed to these obligations should be allocated to
Publicado em: 2007
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21. Analysis and synthesis of multiplexed systems: an approach of reliability and operational maintainability. / Análise e síntese de sistemas multiplexados: uma abordagem de confiabilidade e manutenabilidade operacional.
The work presented under the heading "Analysis and Synthesis of Multiplexed Systems: An Approach of Reliability and Operational Maintainability" has as objective to consider a practical model for the maintenance, based on the reliability and maintainability of components. The data of this work had been gotten through management reports of the Company of Tele
Publicado em: 2007
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22. Amplificadores Ãpticos, estudos de polarizaÃÃo e geraÃÃo de pulso usando processos paramÃtricos em fibras Ãpticas
The recent telecommunication development can be, to a large extent, attributed to the capacity of transmitting information (video, sound and data) at high transmission rates (Tbits/s) through the optical fiber. The constant advances in the technological development of active and passive devices based on optical fibers have enabled a steady increase in commun
Publicado em: 2007
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23. Análise técnico-econômica da introdução de serviços IPTV por operadoras de telecomunicações. / Techno-economic analysis of IPTV services introduction by telecommunications service providers.
A evolução do portfolio de serviços das operadoras em direção a ofertas convergentes que combinam serviços de voz, dados e vídeo é uma tendência do setor de telecomunicações. É neste contexto que o conceito de Internet Protocol Television (IPTV) ganha um papel relevante, pois permite às operadoras oferecerem serviços de vídeo utilizando como b
Publicado em: 2007
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24. Mutually connected DPLL networks: modelling, simulation and optimization. / Redes mutuamente conectadas de DPLLs: modelagem, simulação e otimização.
Clock-distribution is an essential feature in many engineering applications as, for example, telecommunications networks and digital integrated circuits. In the last few decades this problem was predominantly addressed using master-slave strategies. In this type of strategy there are precise reference oscillators in the network called masters and their signa
Publicado em: 2007