A high performance computing module, containing a combination of DSP processor, FPGA, memory and interface circuits will be used to enhance the performance of a lowearth orbit satellite, FedSat-1, which will be operational in 2001. The high performance computer will provide additional hardware redundancy, on-board data processing, data filtering and data compression for scientific data, as well...

Redundancy is a critical component to the design of fault tolerant systems; both hardware and software. This paper explores the possibilities of using evolutionary techniques to first produce a processing system that will perform a required function, and then consider its applicability for producing useful redundancy that can be made use of in the presence of faults, ie is it fault tolerant? Re...

Abstract: Fault-tolerant design concepts, such as self purging, sift-out modular redundancy, overlapping parity, and cyclic duplication coding, are presented. In most of these methods, fault location can be identified and even possibly be isolated or corrected. Practical case studies involving these methodologies are presented. In addition, methodologies to test the voter circuit for possible m...

This paper presents a software architecture for hardware fault tolerance based on loosely-synchronized, redundant virtual machines (LSRVM). LSRVM will provide high levels of reliability by tolerating hardware faults at all levels of the system. Historically, such hardware fault tolerance has only been achievable using customdesigned hardware and proprietary operating systems. Today, however, te...

With continued CMOS scaling, future shipped hardware will be increasingly vulnerable to in-the-field faults. To be broadly deployable, the hardware reliability solution must incur low overheads, precluding use of excessive redundancy. We explore a co-designed hardwaresoftware solution that treats most hardware faults as software bugs and leverages common mechanisms for hardware and software rel...

With continued CMOS scaling, future shipped hardware will be increasingly vulnerable to in-the-field faults. To be broadly deployable, the hardware reliability solution must incur low overheads, precluding use of expensive redundancy. We explore a co-designed hardware-software solution that treats most hardware faults as software bugs and leverages common mechanisms for hardware and software re...

Smaller feature sizes, lower voltage levels, and reduced noise margins have helped improve the performance and lower the power consumption of modern microprocessors. These same advances have made processors more susceptible to transient faults that can corrupt data and make systems unavailable. Designers often compensate for transient faults by adding hardware redundancy and making circuitand p...

numerous and varied but which usually combine those of school psychologist, social worker and any other which may arise. The visiting teacher by the method of individual treatment offers an opportunity for the development of those phases of education which have been neglected. This book contains five case histories written from the point of view of the visiting teacher and they are good example...

Recent models for the failure behaviour of systems involving redundancy and diversity have shown that common mode failures can be accounted for in terms of the variability of the failure probability of components over operational environments. Whenever such variability is present, we can expect that the overall system reliability will be less than we could have expected if the components could ...