In this article, we discuss the optimal and robust designs for accelerated life testing (ALT) when a step-stress plan is performed. It is assumed that the time to failure of a product has a Weibull distribution with a log-linear life-stress relationship. We adopt a generalized Khamis-Higgins model for the effect of changing stress levels. Taking into account that the assumed life-stress relatio...

In This Paper, we focus on estimating the expected total cost and expected cost rate for age replacement under warranty policy. We describe how to use design of Accelerated life testing (ALT) plans by assuming constant stress and life times are independently distributed as Exponentiated Pareto Distribution (EP) for predicting the cost of age replacement under warranty policy. This problem is st...

Abstract: This paper presents the optimal design for accelerated life testing (ALT) experiments when step-stress plans with Type I censoring are performed. We adopt a generalized Khamis-Higgins model for the effect of changing stress levels. It is assumed that the lifetime of a test unit follows a Weibull distribution, and both its shape and scale parameters are functions of the stress level. T...

Özet. NATO güçleri 2002 yılından beri Amerika’nın Afganistan üzerinde başlatmış olduğu bölgede kalıcı barışı sağlama amaçlı mücadelesine destek vermektedir. Bölgede devam eden mücadele öncelikli olarak her ne kadar asker gücü ile devam ettirilse de arka planda karar ve destek verme amaçlı çalışan bir çok yazılım sistemi bulunmaktadır. Bu yazılım sistemleri farklı zamanlarda farklı taraflar tara...

Due to undecidability and complexity of first-order logic, SMT solvers may not terminate on some problems or require a very long time. When this happens, one would like to find the reasons why the solver fails. To this end, we have designed AltGr-Ergo, an interactive graphical interface for the SMT solver Alt-Ergo which allows users and tool developers to help the solver finish some proofs. Alt...

objectives: diabetes mellitus is associated with biochemical, physiological and pathological alterations in the liver. the aim of this study was to investigate the effects of hydroalcoholic extract of prangos ferulacea (l.) lindle (p.f) on changes in rats´ liver structure and serum activities of alanin and aspartate aminotransferases after alloxan injection. materials and methods: in this study...