IFRA*to元件关于可靠性运算的封闭性

对一个较IFRA更为广泛的元件IFRA to 关于可靠性运算的封闭性进行了讨论 ,得出了IFRA to 元件关于协同系统运算是封闭的     

从IFRA Expo看报纸制作技术新动向（下）

4 CTP部分展出情况 1）总体动向 与欧洲报社设备更新相对应,各厂商;隹备了大量的输出设备、印版、工作流程和图像处理解决方案。印版输出设备利用紫激光和热成像新产品,致力于高速化和自动化。     

Bayesian Analysis of Zero-failure Data Based on IFRA Distribution

For many products, distributions of their life mostly comply with increasing failure rates in average （IFRA）. Aiming to these distributions, using properties of IFRA classification, this paper gives a non-parametric method for processing zero-failure data. Estimations of reliabilities in any time are first obtained, and based on a regression model of failure rates, estimations of reliability indexes are given. Finally, a practical example is processed with this method.     

A flexible Weibull extension

We propose a new two-parameter ageing distribution which is a generalization of the Weibull and study its properties. It has a simple failure rate (hazard rate) function. With appropriate choice of parameter values, it is able to model various ageing classes of life distributions including IFR, IFRA and modified bathtub (MBT). The ranges of the two parameters are clearly demarcated to separate these classes. It thus provides an alternative to many existing life distributions. Details of parameter estimation are provided through a Weibull-type probability plot and maximum likelihood. We also derive explicit formulas for the turning points of the failure rate function in terms of its parameters. This, combined with the parameter estimation procedures, will allow empirical estimation of the turning points for real data sets, which provides useful information for reliability policies.