Even though the crew is offered training on such systems, there will be situations where expert assistance is required. RDS reduces the need for such experts to travel to the vessel by providing remote access to the installed diagnostics and control systems. RDS aims to offer a service to ship owners and operators that will reduce the repair time of installations, hence improving the availabili...

We consider a two-unit cold standby system attended by two repairmen and subjected to a priority rule. In order to describe the random behavior of the twin system, we employ a stochastic process endowed with state probability functions satisfying coupled Hokstadtype differential equations. An explicit evaluation of the exact solution is in general quite intricate. Therefore, we propose a numeri...

Reliability is an important consideration in the planning, design and operation of engineeringsystems. As the size and complexity of mining equipment continue to increase, the implica-tions of equipment failure become ever more critical. One method to mitigate the impact offailures is to improve the reliability of the equipment. One of the purposes of system reliabil-ity analysi...

The Hadoop Distributed File System at Yahoo! stores 40 petabytes of application data across 30,000 nodes . The most conventional strategy for data protection—just make a copy somewhere else—is not practical for such large data sets . To be a good custodian of this much data, HDFS must continuously manage the number of replicas for each block, test the integrity of blocks, balance the usage of r...

Modern telecommunications systems are dependent on software for their successful operation. In many cases, the software operates on an established hardware platform and subsequent releases of the system differ primarily in the software component. Because of the increased dependence of the society on advanced telecommunications systems, the reliability and availability of network switching eleme...

This paper describes the network modeling techniques that were developed to assess the reliability and availability performance of the Combat Information Transport System (CITS). CITS is the backbone network that provides high-capacity transport of data, voice, and video for all active duty and reserve Air Force bases. The model includes the network topology, the configuration and interconnecti...

Device drivers are the most unreliable part of an operating system. In this paper, we propose a framework called nDriver. Based on the design diversity concept, it uses multiple implementations of a device driver to survive from driver faults. Once a fault happens in a driver, nDriver can dynamically replace the faulty driver with another implementation, instead of allowing the faulty driver to...

In this paper we analyze the interval availability of a two-echelon, multi-item spare part inventory system. We consider a scenario inspired by a situation that we encountered at Thales Netherlands, a manufacturer of naval sensors and naval command and control systems. Modeling the complete system as a Markov chain we analyze the interval availability. We compute in closed and exact form the ex...