We consider the simulation of transient performance measures of high reliable faulttolerant computer Systems. The most widely used mathematical tools to model the behavior of these Systems are Markov processes. Here, we deal basically with the simulation ofthe mean time tofailure (MTTF) and the reliability, R(t), ofthe system at time t Some variance réduction techniques are used to reduce the s...

~MTTF)2X, with X=PF6, exhibits, at Tsp, a spin-Peierls transition. Below Tsp elastic neutron scattering measurements performed on large protonated and deuterated samples reveal the formation of very weak superstructure reflections at the (1/2,1/2,1/2) reduced wave vector. Upon deuteration Tsp decreases by 30% while the charge ordering (CO) transition increases by 25%. In this framework we stres...

In this paper, we focus on the reliability and performance analysis of Computer Centre (CC) at Yobe State University, Damaturu, Nigeria. The CC consists of three servers: one database mail server, one redundant and one for sharing with the client computers in the CC (called as a local server). Observing the different possibilities of the functioning of the CC, the analysis has been done to eval...

We propose a novel two-layer error control code, combining error detection capability of rectangular codes and error correction capability of Hamming product codes in an efficient way, in order to increase cache error resilience for many core systems, while maintaining low power, area and latency overhead. Based on the fact of low latency and overhead of rectangular codes and high error control...

One of the most important problems of reliability analysis is to estimate the mean lifetime of the item under study. In technical applications this parameter is also called the mean time to failure (MTTF) and is often included in the specification of a product. For example, producers are interested whether this time is sufficiently large, as a large MTTF allows them to extend a warranty time. C...

As machines increase in scale, it is predicted that failure rates of supercomputers will correspondingly increase. Even though the mean time to failure (MTTF) of individual component is high, the large number of components significantly decreases the system MTTF. Meanwhile, the decreasing size of transistors has been critical to the increase in capacity of supercomputers. The smaller the transi...

Conducting a Reliability Demonstration Test (RDT) is a crucial step in production. Products are tested under certain schemes to demonstrate whether their reliability indices reach pre-specified thresholds. Test schemes for RDT have been studied in different situations, e.g., lifetime testing, degradation testing and accelerated testing. Systems designed with several structures are also investig...

Very complex systems occur nowadays quite frequently in many technological areas and they are often required to comply with high dependability standards. To study their availability and reliability characteristics, Markovian models are commonly used. Due to the size and complexity of the systems, and due to the rarity of system failures, both analytical solutions and \crude" simulation can be i...

17 The pattern of failures of many classes of hosts were clearly not exponential. This is not surprising when the data contains points that are obviously invalid, but many classes still failed the test for exponentiality even when such noise is factored out. It is generally true that larger sample sizes provide more evidence against the exponential hypothesis. Massive amounts of data can more e...

In practice, the performance of structure is studied based on a seismic scenario composed independent single earthquakes. But in real life, subjected to multiple earthquakes during its typical design working which will produce an evolution damage with time.The main purpose this paper quantify liquefaction-induced embankment due sequential defined life. Moreover, non-parametric survival analysis...