In this paper, we consider the problem of modeling machine availability in enterprise-area and wide-area distributed computing settings. Using availability data gathered from three different environments, we detail the suitability of four potential statistical distributions for each data set: exponential, Pareto, Weibull, and hyperexponential. In each case, we use software we have developed to ...

This paper presents our analysis of the failure behavior of large scale systems using the failure logs collected by Los Alamos National Laboratory on 22 of their computing clusters.We note that not all nodes show similar failure behavior in the systems. Our objective, therefore, was to arrive at an ordering of nodes to be incrementally (one by one) selected for duplication so as to achieve a ta...

This paper turns the concept of input distributions on its head to exploit inverse input distributions Al though such distributions are not always true math ematical inverses they do capture an intuitive prop erty inputs that have high frequencies in the original distribution will have low frequencies in the inverse distribution and vice versa We can use the inverse distribution in several di e...

this paper considers the job scheduling problem in virtual manufacturing cells (vmcs) with the goal of minimizing two objectives namely, makespan and total travelling distance. to solve this problem two algorithms are proposed: traditional non-dominated sorting genetic algorithm (nsga-ii) and knowledge-based non-dominated sorting genetic algorithm (kbnsga-ii). the difference between these algor...

purpose: to compare orbscan ii (o ii) and ultrasound (us) pachymetry in normal and post-lasik eyes. methods: in a comparative prospective study, central corneal thickness (cct) was measured in 168 eyes of 84 normal subjects and 42 eyes without corneal opacity of 21 post-lasik patients by o ii and us. paired t test was used to identify significant differences between the two methods and pearson ...

Some theoretical evaluation methods of mean time to failure (MTTF) in 2-component standby redundant system with priority have been suggested under the prerequisite that the probability distributions of failure and repair times in each component are respectively specified by the explicit functions. However, this prerequisite might be considerably strict in practical scenes. If we cannot identify...

The response of the water table of an intertidal salt marsh in NW England has been investigated. During neap tides, water seeps upward from the underlying sand-silt-clay interface. This effect continues as the marsh is overtopped during spring tides but is then dwarfed by penetration of water downward from the surface. Under “typical conditions” the delay between high water in the river and max...

The paper was conducted to assess the importance and challenges encountered in the current machine evaluation system in an electronics company as perceived by the respondents. In addition, it also sought to understand the acceptability of the new developed Real-Time Auto-locked Software for Electronics Company (RT-ASEC). The new automated machine evaluation software can detect any irregular mac...

Today the Chaumian Mix idea is not only an academic approach for anonymous communication, it is also a practical system with many variants used in real-world scenarios. It is therefore important to find an appropriate measure for the anonymity provided by these approaches. Many measurement approaches have been proposed that consider only the static state of the system without accounting for pas...