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81.
宋敏 《吉林工程技术师范学院学报》2004,(12)
用MonteCarlo方法对事后可维修串联系统的可靠性进行了计算机模拟,讨论了元件的抽样方法,给出了事后维修的串联系统故障率与时间参数间的变化规律曲线。 相似文献
82.
网絡协議TCP/IP 总被引:1,自引:0,他引:1
网络协议TCP/IP,分别相当于ISO/OSI参考模式中的第四层和第三层,源于美国国防部ARPANET的协议标准.目前,在高档微机工程工作站中得到广泛的应用,并成为工业界的一个“公认”标准. 本文介绍TCP/IP协议,并结合对B-NET(运行于16位微机DUAL系统83和UNIX系统V)中的TCP/IP的提取和分析,着重说明它们的接口及其执行过程机理. 相似文献
83.
Dependent masking and system life data analysis: Bayesian inference for two-component systems 总被引:1,自引:0,他引:1
Data from field operations of a system is often used to estimate the reliability of components. Under ideal circumstances, this system field data contains the time to failure along with information on the exact component responsible for the system failure. However, in many cases, the exact component causing the failure of the system cannot be identified, and is considered to be masked. Previously developed models for estimation of component reliability from masked system life data have been based upon the assumption that masking occurs independently of the true cause of system failure. In this paper we develop a Bayesian methodology for estimating component reliabilities from masked system life data when the probability of masking is dependent upon the true cause of system failure. The Bayesian approach is illustrated for the case of a two-component system of exponentially distributed components. 相似文献
84.
85.
The two-parameter lognormal distribution with density function f(y: γ, σ2) = [(2πσ2)1/2y] 1exp[?(ln y ? γ)2/2σ2], y > 0, is important as a failure-time model in life testing. In this paper, Bayesian lower bounds for the reliability function R(t: γ, σ2) = ?[(γ ? ln t)/σ] are obtained for two cases. First, it is assumed that γ is known and σ2 has either an inverted gamma or “general uniform” prior distribution. Then, for the case that both γ and σ2 are unknown, the normal-gamma prior and Jeffreys' vague prior are considered. Some Monte Carlo simulations are given to indicate some of the properties of the Bayesian lower bounds. 相似文献
86.
Wulfert E Hartley J Lee M Wang N Franco C Sodano R 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2005,21(4):521-536
Gambling screening tools such as the South Oaks Gambling Screen (SOGS) and a DSM-IV Screen for Gambling Problems (NODS) developed
by the National Opinion Research Council have psychometrically validated lifetime and past-year versions. As research questions
often dictate shorter time intervals, researchers have adapted the time frames of these instruments to their specific purposes
without examining whether changing the time frame affects the psychometric properties. In this study, 3-month versions of
SOGS and NODS were administered to a sample of 80 pathological gamblers (59 men, 21 women, mean age 44) seeking treatment
at a state-funded facility. The 3-months versions had good internal consistency, good convergent validity with each other,
with gambling behaviors assessed via the timeline followback method, and with measures of impulsivity. The 3-month versions
also showed good discriminant validity with demographic variables and a measure of verbal IQ. Together the data indicate that
shortening the time frame to 3 months does not seem to have adverse effects on the psychometric properties of SOGS and NODS.
Thus these adapted versions could profitably be used for shorter time intervals, including as pre/post-treatment and follow-up
measures in treatment outcome studies. 相似文献
87.
概要论述了某型号遥控终端的故障模式、影响及危害性分析(FMECA),并指出如何根据FMECA的结果指导遥控终端可靠性设计 相似文献
88.
论客观语言测试的客观性和公正性 总被引:1,自引:0,他引:1
指出了客观题型和机器阅卷掩盖了客观语言测试题目对受试者造成的不公正现象.从试题的难易度和区分度、试题内容以及试题效度三个方面论述了客观题型对客观语言测试的客观性与公正性的影响;并且有针对性地提出四点策略,即不同考试不同对待,综合考虑各项语言技能, 提高试题效度,以及保证命题质量,旨在全面提高客观语言测试的客观性和公正性,有效地利用客观语言测试的特点,以适应语言测试不断发展的需要. 相似文献
89.
ABSTRACTThis paper studies a cold standby repairable system with two identical components and one repairman having multiple vacations applying matrix-analytic methods. The lifetime of the component follows a phase-type distribution. The repair times and the vacation times of the repairman are governed by different phase-type distributions, respectively. For this system, the Markov process governing the system is constructed. The system is studied in a transient and stationary regime, the availability, the reliability, the rates of occurrence of the different types of failures, and the working probability of the repairman are calculated, respectively. A numerical application is performed to illustrate the calculations. 相似文献
90.
Let X1,X2,…,Xp be p random variables with cdf's F1(x),F2(x),…,Fp(x)respectively. Let U = min(X1,X2,…,Xp) and V = max(X1,X2,…,Xp).In this paper we study the problem of uniquely determining and estimating the marginal distributions F1,F2,…,Fp given the distribution of U or of V. First the problem of competing and complementary risks are introduced with examples and the corresponding identification problems are considered when the X1's are independently distributed and U(V) is identified, as well as the case when U(V) is not identified. The case when the X1's are dependent is considered next. Finally the problem of estimation is considered. 相似文献