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Service availability and QoS, in terms of customer affecting performance metrics, is crucial for service systems. However, the increasing complexity in distributed service systems introduce hidden space for software faults, which undermine system availability, leading to fault or even down time. In this paper, we introduce a composition technique, Coordinated Selective Rejuvenation, to automate the...
Condition based maintenance (CBM) aims to balance two extreme sides (i.e., corrective maintenance (CM), and preventive maintenance (PM)) by observing and forecasting the real time health of machines. Recent developments in CBM revealed promising technologies for advanced fault detection, and forecasting. Traditional maintenance scheduling in CBM is based on the threshold setting on forecasted failure...
Effective distribution outage cause identification can help expedite the restoration procedure and improve the system availability. The fuzzy classification E-algorithm and the immune system inspired classification algorithm, artificial immune recognition system (AIRS), have demonstrated good capabilities in outage cause identification, especially with the existence of imbalanced data. E-algorithm...
The use of fault tolerant drives is a way to achieve reliability and high system availability in airplanes. To isolate electrical fault it has been proposed to use concentrated coils around stator teeth with spacer teeth in between the coils. The space harmonic content of the air gap flux density in this type of machine is high. During normal operation certain harmonics are cancelled. This paper investigates...
The fault restoration technique based on n:m scheme can improve system availability with small cost increases for WDM networks, where it is possible that n faults occur synchronously in a protection domain or a protection entity, but it has rarely been implemented or standardized. In this paper, an analytical model for mean restoration time of restoration mechanism based on n:m scheme is developed...
This paper describes a testability analysis methodology that improves efficiency in maintainability and availability of a system, provides improvements in the overall capabilities of this system, and has historical verifiable data to compare the testability analysis metrics to the observed discrepancy reports. Here is a methodology that illustrates the use of a testability analysis tool to aid in...
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