Asynchronous Distributed Systems
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Proposal of a new approach for BER evaluation of multirate, multiservice OCDMA systems / Proposta de uma nova abordagem para o cálculo da BER de sistemas OCDMA de múltiplas taxas e multiserviços
The continuous evolution of the optical communication technology in the last few years has allowed the growing users demand for higher bandwidth to be satisfactorily attended. This new demand is mainly attributed to the growing popularity of bandwidth-intensive networking applications, such as Internet protocol television (IPTV), high-definition television (
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/08/2012
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2. Proposta de um procedimento para a modelagem de sistemas de controle de edifícios inteligentes utilizando a rede de Petri colorida. / A procedure for modelling the control system in intelligent buildings based on colored Petri nets.
Technological advances in recent decades have motivated the development of intelligent buildings, aimed at creating environments more productive for the occupants, economically advantageous for the owners and environmentally correct. New ways of interaction between users and the buildings systems are emerging from these kinds of systems, which are not adequa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/08/2011
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3. Redução dos efeitos negativos das suspeitas incorretas no algoritmo de consenso de Chandra e Toueg
Some protocols in distributed systems, such as atomic broadcast and semi-passive replication, are based on the consensus algorithm proposed by Chandra and Toueg. This algorithm is equipped with an unreliable failure detector. In asynchronous distributed systems, this type of detector can make mistakes by erroneously suspecting a process that is still running
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2011
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4. Avaliação dos detectores de defeitos e sua influência nas operações de consenso / On the evaluation of failure detectors and their influence on consensus operations
Este trabalho relata observações e analises sobre como os detectores de defeitos influenciam as operação de consenso. O conceito dos detectores de defeitos é essencial para as operações de consenso em sistemas distribuídos assíncronos, uma vez que esses representam uma das (micas formas de sobrepujar as limitações impostas pela chamada Impossibili
Publicado em: 2010
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5. Formal specification and verification of real-time systems using Graph Grammars
The importance of real-time systems has enormously increased in the last decade. Application areas that typically need real-time models include railroad systems, intelligent vehicle highway systems, avionics, multimedia and telephony. To assure that such systems are correct, additionally to prove that they provide the required functionality, time constraints
Journal of the Brazilian Computer Society. Publicado em: 2007-12
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6. A New Approach to Reduce Control Messages in Failure Detectors / UMA NOVA ABORDAGEM PARA REDUÇÃO DE MENSAGENS DE CONTROLE EM DETECTORES DE DEFEITOS
An unreliable failure detector is a basic building block widely used to implement fault tolerance techniques in asynchronous distributed systems. The use of failure detectors comes from the impossibility to implement deterministic agreement protocols in these environments, since it is not possible to distinguish a crashed process from a very slow process. Ho
Publicado em: 2006
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7. Efficient and robust adaptive consensus services based on oracles
Due to their fundamental role in the design of faulttolerant distributed systems, consensus protocols have been widely studied. Most of the research in this area has focused on providing ways for circumventing the impossibility of reaching consensus on a purely asynchronous system subject to failures. Of particular interest are the indulgent consensus protoc
Journal of the Brazilian Computer Society. Publicado em: 2005-04
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8. Um modelo hÃbrido e adaptativo para sistemas distribuÃdos tolerantes a falhas
A distributed system can be defined as a set of processes that communicate via communication channels. Models for such systems characterize its aspects, mainly in the temporal and reliability domains. Partially synchronous models have been successfully developed to circumvent the impossibility of achieving fault tolerant consensus in pure, time free, asynchr
Publicado em: 2005
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9. A COLLABORATIVE MODEL FOR EVENT SCHEDULING USING COROUTINES / UM MODELO DE ESCALONAMENTO COLABORATIVO DE EVENTOS BASEADO EM CORROTINAS
Event oriented systems are becoming present on many domains of applications. Distributed systems and graphical interactive systems are classical examples of environments that adapt well to the concept of event oriented programming. There are also emerging scenarios like cellphone runtime environments. Despite the growing presence on the computational systems
Publicado em: 2005
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10. A software development platform based on components for mobile devices / Plataforma de desenvolvimento de software baseado em componentes para dispositivos moveis
This work presents an infrastructure for supporting component-based software development for mobile devices with limited resources regarding processing power and storage. This infrastructure is based on a neutral component model in terms of technology and specified entirely in UML (Unified Modeling Language). The platform employs Web Services for synchronous
Publicado em: 2005
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11. Analysis of the vulnerability area and tension stability in electric systems with the insert of wind parks / Análise da área de vulnerabilidade e estabilidade de tensão em sistemas elétricos com a inserção de parques eólicos
The present dissertation evaluates the voltage sag and stability of the real electrical system with the insertion of wind farms. The voltage sags studies serve of base for determination of the vulnerability areas of the electrical system, in which, in turn, the aspects are investigated regarding the voltage instability caused by the integration of wind syste
Publicado em: 2005
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12. Metaheuristicas aplicadas ao planejamento da expansão da transmissão de energia eletrica em ambientes de processamento distribuido
In this work, several combinatorial metaheuristics are developed for solving the transmission expansion planning problem of electric power systems that is analysed considering the static and long-term approach, e.g. a parallel version of the simulated annealing methodology and several parallel versions of a genetic algorithms, besides an asynchronous team wh
Publicado em: 2004