This paper deals with the condition-based maintenance of single-unit systems which are subject to the competing and dependent failures due deterioration and traumatic shock events. The main aim is to provide a model to assess the value of condition monitoring information for the maintenance decision-making. A condition-based periodic inspection/replacement policy is developed and compared with ...

Effectively analyzing failure mechanisms is critical for ensuring safety and reliability aspects in embedded systems. This requires close collaborations between the system engineers who design the system and the safety experts who analyze the failures. To support this process, we present an interactive visual environment, called ESSAVis++, that helps in extracting the required safety informatio...

  Background and Objective: Bacterial meningitis is an important cause of mortality and long-term neural morbidity. Immediate diagnosis and treatment are necessary in appropriate time. This study was designed in Afzalipour Hospital in Kerman to evaluate meningitis causes, frequency and CSF laboratory changes. Patients and Methods: In this retrograde descriptive study from September 2003 to Se...

Warranty data contain useful information about product quality and reliability, but they are usually coarse data because they may be aggregated, delayed, censored, missing or vague. They might, however, be the only forms of warranty data a manufacturer has, analysing such data are therefore needed and can also be of benefit to manufacturers in identifying early warnings of abnormalities in thei...

Considering a semicoherent system made up of n components having i.i.d. continuous lifetimes, Samaniego defined its structural signature as the n-tuple whose k-th coordinate is the probability that the k-th component failure causes the system to fail. This n-tuple, which depends only on the structure of the system and not on the distribution of the component lifetimes, is a very useful tool in ...

Abstract: The paper presents an example of qualitative and quantitative application of a method for assessing component importance of a reliability structure in the case of a complex technical system based on the example of the subsystem of a marine power plant, that is, a lube oil system for sealing a stern tube. An example of the importance of the analysis considered in terms of not only reli...

Measurement errors and other uncertainties place an interval of ambiguity around the mean value of system probability of failure and each path and component failure probability. Associated with a specified reliability R that a failure probability will lie within an interval is a confidence C in that reliability. The statement that the system probability of failure lies within a specified interv...

A reliable prognostics framework is essential to address failure mode mitigation and life cycle cost of aerospace systems. Metallic aircraft components are subject to a variety of inservice loading conditions and prediction of fatigue life remains a critical challenge. A hybrid prognostic model, which can accurately predict the crack growth regime and the residual useful life estimate (RULE) of...

Article history: Received 22 May 2015 Received in revised form 15 June 2015 Accepted 23 June 2015 Available online xxxx GaN-based LEDs often use polymermaterial as chip coating. The most used polymer coatings are siloxane-based materials such as poly(methyl-phenyl-silixane) – PMPS – or poly(dimethylsiloxane) — PDMS. Although their thermal properties offer great possibilities to justify their in...