Scientific data centers comprised of high-powered computing equipment and large capacity disk storage systems consume considerable amount of energy. Dynamic power management techniques (DPM) are commonly used for saving energy in disk systems. These involve powering down disks that exhibit long idle periods and placing them in standby mode. A file request from a disk in standby mode will incur ...

The reliability of repairable stand by systems is investigated using semi-Markov processes. The systems are composed of n units having general failure time distribution with mean 1/). and of r repair facilities having exponential repair time distribution with mean l/p. For these systems, the Laplace-Stieltjes transform (LST) of the system failure time distribution is derived in the form of a ge...

High availability (HA) is critical for many stream processing applications such as financial data analysis and disaster response. Existing HA schemes use either active standby or passive standby to guard the system against unexpected failures such as machine crash. Despite previous efforts of simulation-based studies that report active standby is superior, there is a lack of in-depth understand...

the long term goal attaining of economic system management requires the establishment of a dynamic framework to integrate multiple perspectives. this article considers the problem of economic development in macro level. as economic systems are complex adaptive systems composed of numerous numbers of components of dynamic and multidimensional nature, dynamics method is applied in this research. ...

Increased leakage current and device variability are the major challenges with CMOS technology scaling. Since Static Random Accessed Memory (SRAM) is often the largest component in the embedded digital systems or System-on-Chip (SoC), it is more vulnerable to those challenges. To effectively reduce SRAM leakage and/or active power, supply voltage (VDD) is often scaled down during standby and/or...

This paper deals with a stochastic model for a two-unit hot standby combined hardware-software system in which one unit is operative and the other is hot standby. The operative unit may have hardware or software failures and goes to repair. This leads to degradation of the system and then hot standby unit is under operation. Further on hardware or software failures of the hot standby unit the s...

In this study, we consider the stress-strength reliability and mean remaining strength of a series system with cold standby redundancy at component levels. Classical Bayesian approaches are studied in order to obtain estimates when underlying stress, components follow exponential distribution different parameters. Bayes approximated by using Lindley’s approximation Markov Chain Monte Carlo meth...