In the design of interlock loops for the signal exchange in machine protection systems, the choice of the hardware architecture impacts on machine safety and availability. The reliable performance of a machine stop (leaving the machine in a safe state) in case of an emergency, is an inherent requirement. The constraints in terms of machine availability on the other hand may differ from one faci...

Step-stress accelerated degradation test (SSADT) is a useful tool for assessing the lifetime distribution of highly reliable products (under a normal-use condition) when the available test items are very few. Recently, an optimal SSADT plan has been proposed in the literature which is based on the assumption that the underlying degradation path follows a Wiener process. However, the degradation...

In large-scale systems where number of components can approach a million a failure is a significant problem. In this paper authors have presented and analyzed failure data from different large systems. More than 100,000 disks with different interfaces which come from at least four different vendors have been investigated. According to information which one can find in datasheets the annual fail...

Disk arrays (RAID) have been proposed as a possible approach to solving the emerging I/O bottleneck problem. The performance of a RAID system when all disks are operational and the MTTF,,, (mean time to system failure) have been well studied. However, the performance of disk arrays in the presence of failed disks has not received much attention. The same techniques that provide the storage effi...

Software reliability is an important aspect in software engineering enviourment. Software reliability is introduced as failure free operation in specified enviourment. Various studies show that the software reliability is defined in three categories that are improvement, modelling and measurement. In this paper, we will study the reliability metrics to improve the software reliability. Reliabil...

Tidal forcing and its fortnightly variation are known to be one of the main regulating agents of physical and biogeochemical signatures in the Strait of Gibraltar and surrounding areas. Samples obtained during spring and neap tides in the region were analyzed to determine the influence of this tidal variation on the submesoscale distribution of water masses and biological elements. During sprin...

1 Motivation The compliant walking models are often used for reproducing characteristic gait dynamics [1]. However, since they require the touchdown angles to be chosen independently, there is a limited explanation for the foot placement selection in relation to the state of the body. In this study, it is hypothesized that the foot placement is indicated by progression of the center of pressure...

E ffective software can mean software that is low cost, reliable, rapidly developed, safe, or has some other relevant attribute. To determine whether a particular technique is effective, we need a way to measure it. Merely saying that a technique is effective conveys no real information. Instead, we need measurements applied to each software attribute so we can say one technique is more or less...

The National Air Traffic Services (NATS) in London require data on the performance likely to be achieved by the navigation system on board aircraft flying in UK airspace. To that end the performance of three different GPS receiver types (all designed for aviation use) has been examined. This paper details the result of that work. The achieved Mean Time Between Failures (referred to here as “Out...

Web Services are built on service-oriented architecture which is based on the notion of building applications by discovering and orchestrating services available on the web. Complex business processes can be realized by discovering and orchestrating already available services on the web. In order to make these orchestrated web services resilient to faults; we proposed a simple and elegant check...