Christoph Scherrer

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The paper analyzes the prerequisites for the determination of most efficient combinations of error detection mechanisms based on the results of fault injection experiments. Two crucial requirements are identified: (1) for the classification of the experiment outcome it is essential to observe whether a system failure actually occurs. Error detections should(More)
This paper analyzes the effect of dormant faults on the mean time to failure (MTTF) of highly reliable systems. The analysis is performed by means of Markov models that allow quantifying the effect of dormant faults and other vital reliability parameters. It turns out that the presence of dormant faults can drastically reduce the MTTF of a system,(More)
Composability and mixed criticality are concepts that promise an ease of development and certification for safety critical systems in all industrial domains. In this paper we define the necessary requirements, highlight issues and classify fault containment, when extending already existing triple modular redundant architectures with these concepts. We(More)
Many fault-tolerant architectures are based on the single fault assumption, hence accumulation of d o m n t faults represents a potential reliability hazard. Based on the example of the fail-silent “Time-Triggered Architecture” we study sources and effects of dormant faults. We identifl software as being more prone to dormant faults than hardware. By means(More)
The discussion paper discusses the macroeconomic argument of a New Economy that is characterized by higher non-inflationary economic growth due to increases in productivity caused by the digital revolution. Besides presenting evidence put forward by mainstream protagonists of the New Economy, it explores an interpretation of the New Economy inspired by(More)
49 All these systems have an important common feature: they are safety-critical and must therefore be developed according to the highest safety integrity level (SIL4), as defined in the standards applicable to the railway industry (CENELEC 50126, 50128, 50129, Railway Applications Standards [RAMS, software and electronics]). Apart from being suitable for(More)