AVAILABILITY ANALYSIS OF A TWO-UNIT SERIES SYSTEM WITH SHUT-OFF RULE AND “FIRST-FAIL,FIRST-REPAIRED”

Ⅰ.Intreduction It is Well known that series system is one of the most essential and important medels in reliability theory and application.A series system of twe units operates if and only if both units operate.However,in practice,unit 1 upon failure may shut off unit 2 but not vice versa.For example,failure of the power supply may shut down an electronic device but not vice versa.Barlow and Hudes first discussed the asymptotic measures of such a system performance.Next Khalil reviewed the results on availability of series systems with various shut-off rules,introduced combination concepts of shut-off rules,and extended the results     

故障树的对偶树和成功树

本文给出了故障树的对偶树和成功树是等同的解释。     

具有随机N—策略的M／G／1排队系统

本文讨论具有随机N-策略的M/G/1排队系统,采用向量Markov过程方法得到该系统有关的排队指标。上述结果可以看作是普通的和N-策略的M/G/1排队系统的推广。     

两部件并行系统可靠性分析的某些新推进

两个不同部件的并行系统是可靠性数学研究的最典型模型之一。有许多作者曾采用不同的方法研究过这个系统。例如,Nakagawa和Osaki用Markov更新过程的理论研究了两部件寿命分布均为负指数分布的特殊情形。程侃和曹晋华用Markov更新过程和交替更新过程的理论研究了其中一个部件的寿命分布和修理时间分布为负指数分布的特殊情形。Linton用补充变量方法研究了其中一个部件的寿命分布和修理时间分布     

Affine Transformation in Random Iterated Function Systems

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ON THE SPH-DISTRIBUTION CLASS

Following up Neuts‘ idea, the SPH-distribution class associated with bounded Q matrices for infinite Markov chains is defined. The main result in this paper is to characterize the SPH class through the derivatives of the distribution functions. Based on the characterization theorem, closure properties, the expansion, uniform approximation,and the matrix representations of the SPH class are also discussed by the derivatives of the distribution functions at origin.Key words Phase type distribution, absorbing Markov chain, operator theory, SPH- distribution, properties     

T-QBD过程水平和位相的独立性

研究了三对角无限位相拟生灭过程(T-QBD过程)平稳分布水平与位相的独立性.首先,给出了水平和位相相互独立并且两个边缘分布都为几何分布的充要条件,得到了过程平稳分布的解析形式;其次,提出了验证水平和位相独立性条件的具体方法,说明了如何把得到的结果应用于实际模型,最后,讨论了一种广义独立性,并对水平和位相独立时率算子的性质做了某些讨论.     

一类修正Cooper-Frieze网络的稳定性研究

基于Markov链理论,研究了一类修正Cooper-Frieze模型的稳定性.通过将模型中节点度与Markov链建立联系,利用Markov理论中首达概率的思想为稳态度分布的存在性提供了证明,并从数学上推导出度分布的具体表达式.最后,对该模型的度分布和聚集性提供了仿真分析,并与BA模型作了相应的对比.     

基于知识神经网络的大肠杆菌启动子识别算法的改进及C++实现

本文简要介绍了基于知识神经网络算法在启动子识别中的应用以及对该算法的若干改进,并通过C 实现.对86个启动子与82个非启动子样本,利用改进算法并通过交叉验证,其预测结果显示误分类样本个数仅为2个,达到了更高的准确率.