Fault Tolerant System
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Reducing the Effects of Inaccurate Fault Estimation in Spacecraft Stabilization
ABSTRACT Reference Governor is an important component of Active Fault Tolerant Control. One of the main reasons for using Reference Governor is to adjust/modify the reference trajectories to maintain the stability of the post-fault system, especially when a series of actuator faults occur and the faulty system can not retain the pre-fault performance. Fault
J. Aerosp. Technol. Manag.. Publicado em: 2017-12
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2. An Asynchronous Interface with Robust Control for Globally-Asynchronous Locally-Synchronous Systems
ABSTRACT: Contemporary digital systems must necessarily be based on the "System-on-Chip" (SoC) concept. Especially in relation to the aerospace industry, these systems must overcome some additional engineering challenges concerning reliability, safety and low power. An interesting style for aerospace SoC design is the GALS (Globally Asynchronous, Locally Syn
J. Aerosp. Technol. Manag.. Publicado em: 2013-03
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3. Fault-tolerant state estimation of linear Gaussian systems subject to additive faults
Owing to the need for the satisfaction of attributes such as safety, maintainability, and reliability in modern critical engineering devices, the design of automatic feedback control systems has increasingly demanding fault-tolerant methods. In particular, if the system states cannot directly be measured by the available suite of sensors, a fault-tolerant st
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2011
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4. Avaliação comparativa entre técnicas de programação defensiva aplicadas a um sistema crítico simulado. / Comparative evaluation among defensive programming techniques applied in a critical system simulated.
The introduction of software systems for critical applications raises safety issues that have long fell predominantly on the development of the hardware composing such systems. Currently, standards related to safety software qualitatively assess the impact of their use on systems sensitive to random errors. The research developed here seeks, in addition to o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/05/2011
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5. New techniques for improving the performance of the lockstep architecture for SEEs mitigation in FPGA embedded processors
The growing availability of embedded processors inside FPGAs provides unprecedented flexibility for system designers. The use of such devices for space or mission critical applications, however, is being delayed by the lack of effective low cost techniques to mitigate radiation induced errors. In this paper a non invasive approach for the implementation of f
Publicado em: 2011
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6. A FAULT TOLERANT MECHANISM FOR WORKFLOW MANAGEMENT SYSTEMS / UM MECANISMO DE TOLERÂNCIA A FALHAS PARA SISTEMA DE GERENCIAMENTO DE WORKFLOW
In this work we propose a mechanism for failure detection, group management and service replication, providing fault tolerance for workflow management systems. Workflow management systems require specific replication features, since such systems deal with non-deterministic operations and update their s internal state without any external calls. As a case stu
Publicado em: 2010
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7. TSADA - SISTEMA DE TELEMETRIA REDUNDANTE E TOLERANTE A FALHAS UTILIZANDO TECNOLOGIA GSM/GPRS E ZIGBEE / TSADA - REDUNDANT AND FAULT-TOLERANT TELEMETRY SYSTEM TECHNOLOGIES USING GSM / GPRS AND ZIGBEE
This work deals with a telemetry system for agricultural mechanization, using GSM / GPRS and ZigBee Radio Frequency. The whole system is a mechanism for collecting and transmitting data at one point moving to a fixed basis, with a system integration and validation. The system gives priority to transmit GSM / GPRS, permitting as an alternative transmission ov
Publicado em: 2010
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8. Uma abordagem arquitetural para o desenvolvimento rigoroso de sistemas confiáveis baseados em componentes / A rigorous architectural approach to development component-based software systems
The incorporation of fault tolerance into systems normally increases their complexity, which consequently makes their analysis more difficult. Moreover, the use of exception handling mechanisms to develop robust software systems in a non-systematic manner can be a source of many design faults. This thesis presents a rigorous and architecture-centric developm
Publicado em: 2009
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9. AvaliaÃÃo e modelagem de desempenho para planejamento de capacidade de sistema de transferÃncia eletrÃnica de fundos utilizando trÃfego em rajada
Over the last years, reliability and availability have become a crucial factor in designing computer systems, especially fault-tolerant ones. In such systems, redundant components are added to the system that continues to function uninterruptedly despite the occurrence of failures. Some well-known techniques to operate spare modules include hot standby, cold
Publicado em: 2009
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10. Um framework para coordenação do tratamento de exceções em sistemas tolerantes a falhas / A framework for exception handling coordination in fault-tolerant systems
The widespread scale adoption of computer networks and database management systems has contributed to the arising of complex information systems. Nowadays, these systems have become essential aspects in the everyday life, supporting business processes and indispensable enterprise services to society such as banking automation and telephony. The usage of comp
Publicado em: 2007
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11. AvaliaÃÃo de dependabilidade de sistemas com mecanismos tolerantes a falha: desenvolvimento de um mÃtodo hÃbrido baseado em EDSPN e diagrama de blocos
In current days, we observe a vertiginous advance of technology and a larger dependence of the society on computational systems. A massive use of computerized devices, fixed and mobile, inside a concept of ubiquitous computation, and the increasing pervasiveness of computers and services networks, have been turning systems extremely complex and dynamic. This
Publicado em: 2007
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12. A policy-based architecture for fault management in optical networks / Uma arquitetura baseada em politicas para gerencia de falhas em redes opticas
In these last few years, optical networking technology has been considered as a solution for bottlenecks found in today s networks. Each optical fiber is capable to have from ten to hundreds of optical channels that operate at rates from 51 Mb/s to ten of terabits per second. These channels are important elements in the composition of lightpaths, the default
Publicado em: 2006