Constrained Networks
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Algoritmos de autenticação de mensagens para redes de sensores. / Message authentication algorithms for wireless sensor networks.
Security is an important concern in any modern network. However, networks that are highly dependent on constrained devices (such as sensors, tokens and smart cards) impose a difficult challenge: their reduced availability of memory, processing power and (specially) energy hinders the deployment of many modern cryptographic algorithms known to be secure. This
Publicado em: 2010
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2. Adaptive Nonlinear H controllers applied to constrained manipulators / Controladores adaptativos não-lineares com critério H aplicados a manipuladores com restrições de força e posição
Neste trabalho é apresentado um estudo comparativo entre quatro controladores H não lineares aplicados a um manipulador robótico com restrições de força e posição. Para estudar o comportamento de cada controlador as seguintes estratégias foram adotadas: (1) o modelo nominal do robô é considerado conhecido e são utilizadas técnicas inteligentes p
Publicado em: 2009
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3. Cryptographic algorithms for sensor networks. / Algoritmos criptográficos para redes de sensores.
The need for security is a great concern in any modern network. However, networks that are highly dependent of constrained devices (such as sensors, tokens and smart cards) impose a difficult challenge: their reduced availability of memory, processing power and (more importantly) energy hinders the deployment of many important cryptographic algorithms known
Publicado em: 2008
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4. Algebraic formulation for modeling hop-by-hop multi-constrained routing algorithms. / Formulação algébrica para a modelagem de algoritmos de roteamento multi-restritivo hop-by-hop.
This work presents a new mathematical structure for paths algebra that allows the convergence analysis of hop-by-hop multi-constrained routing algorithms and, under the traffic engineering and quality of service perspectives in the Generalized Multiprotocol Label Switching (GMPLS) architecture, trustily ensures the aggregation of new routing metrics in a con
Publicado em: 2008
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5. Modelos computacionais para o escalonamento de tarefas em redes de dutos / Computational models for task scheduling in pipeline networks
This dissertation deals with a very difficult overly-constrained scheduling challenge: how to operate a large pipeline network in order to adequately transport oil derivatives and biofuels from refineries to local markets. Pipeline network systems are considered the major option for transporting these product types, in view of their many economic and environ
Publicado em: 2008
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6. Proposta e avaliação: algoritmos para gerência de banda e seleção de caminhos em redes MPLS (DS-TE)
Este trabalho tem como objetivo propor e avaliar algoritmos para a gerência de banda compartilhada entre tipos de classes e a seleção de caminhos em redes DS-TE (DiffServ Aware MPLS Traffic Engineering) configurada com o modelo de restrição de banda RDM (Russian Doll Model). A dissertação introduz inicialmente as tecnologias que suportam a Qualidade d
Publicado em: 2008
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7. Uma arquitetura neuro-genética para otimização não-linear restrita / Neuro-genetic architecture for constrained nonlinear optimization
Systems based on artificial neural networks and genetic algorithms are an alternative method for solving systems optimization problems. The genetic algorithms must its popularity to make possible cover nonlinear and extensive search spaces. Artificial neural networks have high processing rates due to the use of a massive number of simple processing elements
Publicado em: 2007
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8. Um mecanismo de processamento de consultas distribuído em redes de sensores sem fio
Resumo: Uma rede de sensores sem fio (RSSF) consiste de grupos de sensores em rede, distribuídos espacialmente e enviando dados a um nó sumidouro, denominado estação base. Estes sensores em geral são fortemente limitados em recursos. Em uma RSSF os dados coletados são passados de sensor a sensor até que a estação base seja alcançada. Considerando a
Publicado em: 2007
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9. Identificação de sistemas "on-line", otimização e controle avançado com o filtro de Kalman estendido / On line system identification, advanced control and optimization with the (Extended) Kalman filter
In the continuing competition between it will be more and more necessary to optimize current chemical processes in real time. To be able to optimize a plant in real time, there have to be various aspects to be fulfilled, such as measurement, reliability of the measurement and prediction of the process behaviour. In this work some of the aspects of such an ad
Publicado em: 2006
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10. Um estudo algorítmico de problemas logísticos na indústria de petróleo e gás natural / An algorithmic study of logistic problems on petroleum and natural gas industry
This work consists on the study of two important problems arising from the operations of petroleum and natural gas industries. The first problem the pipe dimensioning problem on constrained gas distribution networks consists in finding the least cost combination of diameters from a discrete set of commercially available ones for the pipes of a given gas netw
Publicado em: 2006
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11. LINDAX: UMA LINGUAGEM DE DESCRIÇÃO DE SISTEMAS DE COMUNICAÇÃO ADAPTÁVEIS / LINDAX.: A LANGUAGE FOR DESCRIBING ADAPTABLE COMMUNICATION SYSTEMS
It is increasingly noticeable, in the current telecommunications market, a trend towards using communication systems that allow rapid and cheap deployment of new services. In pursuit of network architectures that keep up with such trend, significant research has been carried out on programmable networks. This field is set to gain further impetus from develop
Publicado em: 2005
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12. STRUCTURES AND ALGORITHMS FOR MULTIUSER DETECTION AND INTERFERENCE SUPRESSION IN DS-CDMA SYSTEMS / ESTRUTURAS E ALGORITMOS PARA DETECÇÃO MULTIUSUÁRIO E SUPRESSÃO DE INTERFERÊNCIA EM SISTEMAS DS-CDMA
This thesis presents new structures and algorithms for multiuser detection and interference suppression in DS-CDMA systems. Structures based on recurrent neural networks are investigated for decision feedback receivers and adaptive algorithms are developed for combatting multiple access interference and intersymbol interference. New algorithms based on the m
Publicado em: 2004