Although fault-tolerant implementations of CORBA have been available for several years, the standard specification of fault-tolerant CORBA (FT-CORBA) has been finalized only recently. This specification defines simple, minimal mechanisms for regular clients to deal with fault-tolerant servers, as well as a wide spectrum of services and APIs for implementing replicated, fault-tolerant servers. W...

Reeective systems can be used to ease the implementation of fault tolerance mechanisms in distributed applications as show in Anc95, Fab94]. In this paper we introduce a new model for reeective computations, and we show how it can be used for building up fault tolerant applications.

Today’s trends in control engineering and robotics are blending gradually into a slightly challenging area, the development of fault tolerant real-time applications. Hence, applications should timely deliver synchronized data-sets, minimize latency in their response and meet their performance specifications in the presence of disturbances and faults. The fault tolerant behavior in mobile robots...

Stimulated by the growing demand for improving system performance and reliability, fault-tolerant system design has been receiving significant attention. This paper proposes a new fault-tolerant control methodology using adaptive estimation and control approaches based on the learning capabilities of neural networks or fuzzy systems. On-line approximation-based stable adaptive neural/fuzzy cont...

The expanding application of computing systems and the continuing advances in semiconductor technology are forcing the on-chip inclusion of design for dependability features (concurrent fault tolerance). These features detect, log and provide recovery from errors induced by faults concurrently with the operation of the system. A very difficult task is the hardware validation of concurrent fault...

The reliability of a fault-tolerant circuit may be drastically impaired by the presence of maskable faults that never affect its functionality. Design for testability (DFT) techniques have to be applied to make maskable faults detectable. During the testing phase, traditional DFT schemes inhibit fault masking and/or activate additional observation/control paths through the circuit. Such schemes...

Although fault tolerant systems are badly needed, their development is not a trivial task. Considering fault tolerant distributed systems, this difficulty is even bigger, and any artifact that could make this task easier becomes highly valuable. In this paper, we propose and model a distributed consensus service and a f ault detection service, namely, DisCusS and FuSe, that can be used as build...

A theoretical framework for active fault-tolerant attitude stabilization control is developed and applied to flexible spacecraft. The proposed scheme solves a difficult problem of fault-tolerant controller design in the presence of severe partial loss of actuator effectiveness faults and external disturbances. This is accomplished by developing an observer-based fault detection and diagnosis me...

In this paper. we review the two existing methods of producing fault-tolerant software and the;r associated reliability models. A new approach to software fault-tolerance, the Consensus Recovery Block, is proposed. Its reliability model 1S used to demonstrate its superiority over the conventional methods.