This study attempts to propose an availability optimization decision support design system for repairable n-stage mixed systems, in which different combinations of subsystems, such as parallel, standby, and k-out-of-q, are connected series configuration. The enumeration method, tabu search, simulated annealing, non-equilibrium the modified redundancy allocation heuristic combined with a genetic...

This paper presents dynamic standby control (DSC) with voltage keeper for further standby power reduction. As compared to the reported DSC, the new modified DSC can be kept deeply cut-off with negative overdrive voltage as well. Besides, a bootstrapped voltage keeper directly recharges the boosted node of power gate, which prevents leakage current during the recharging period. However, total st...

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Disaster recovery planning and securing business processes against outtakes have been essential parts of running a company for decades. As IT systems became more important, and especially since more and more revenue is generated over the Internet, securing the IT systems that support the business processes against outages is essential. Using fully operational standby sites with periodically upd...

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...

There are generally considered to be four major types of digital circuit redundancy techniques in use today. They are the Shannon-Moore component redundancy method, the "quadded logic" approach suggested by Tryon,von Neumann's triplication and majority-voting technique, and the basic standby redundancy systems. When viewed in the light of design criteria which are based upon the requirements of...

Sterk, M. M. 2018. Ribosome standby sites and other structural aspects of translation initiation regions in Escherichia coli . Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1636. 58 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0249-2. Translation initiation, which is rate-limiting in protein synthesis, is often the step at wh...

In the IT field the term “fault tolerance” is often widely used as “reliability improvement”. The question to be clarified is the relationship between reliability and fault tolerance. In a general sense reliability will be understood as ability of a component/system to function correctly over a specified period of time, mostly under predefined conditions. Fault tolerance is defined as the abili...

In a server power system, a standby converter is required in order to provide the standby output, monitor the system’s status, and communicate with the server power system. Since these functions are always required, losses from the standby converter are produced even though the system operates in normal mode. For these reasons, the losses deteriorate the total efficiency of the system. In this ...