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621.
Stephen M. Scariano 《统计学通讯:模拟与计算》2013,42(1):255-261
This paper introduces a new biostatistical approach to the problems of estimating true values and approximating the distribution of true values from unreliable data.We present the basic rationale for the unmixing method and report on a simulation study of its properties in estimating the centiles of a skewed, outlier-prone class of distributions.We also present an application to highly skewed USDA vitamin A intake data, and a pseudo-code version of the unmixing algorithm that we hope will allow other researchers to experiment with it 相似文献
622.
This paper is concerned with classifying k Weibull populations by their reliabilities with respect to a control population. He have proposed procedures which can be used for maximum likelihood estimators or simplified linear estimators of the parameters. Estimators are based on type II censored data. The cases considered include unknown shape parameters being equal or unequal. In selected cases, the constants needed for the procedures are tabulated using Monte Carlo methods. 相似文献
623.
624.
Task Analysis for Industrial Work Process from Aspects of Human Reliability and System Safety 总被引:2,自引:0,他引:2
In the design, development, and manufacturing stage of industrial products, engineers usually focus on the problems caused by hardware or software, but pay less attention to problems caused by human error, which may significantly affect system reliability and safety. Although operating procedures are strictly followed, human error still may occur occasionally. Among the influencing factors, the inappropriate design of standard operation procedure (SOP) or standard assembly procedure (SAP) is an important and latent reason for unexpected results found during human operation. To reduce the error probability and error effects of these unexpected behaviors in the industrial work process, overall evaluation of SOP or SAP quality has become an essential task. The human error criticality analysis (HECA) method was developed to identify the potentially critical problems caused by human error in the human operation system. This method performs task analysis on the basis of operation procedure. For example, SOP, analyzes the human error probability (HEP) for each human operation step, and assesses its error effects to the whole system. The results of the analysis will show the interrelationship that exists between critical human tasks, critical human error modes, and human reliability information of the human operation system. To identify the robustness of the model, a case study of initiator assembly tasks was conducted. Results show that the HECA method is practicable in evaluating the operation procedure, and the information is valuable in identifying the means to upgrade human reliability and system safety for human tasks. 相似文献
625.
David D. Hanagal 《Statistical Papers》1999,40(1):99-106
In this paper, we estimate the reliability of a system with k components. The system functions when at least s (1≤s≤k) components survive a common random stress. We assume that the strengths of these k components are subjected to a common
stress which is independent of the strengths of these k components. If (X
1,X
2,…,X
k
) are strengths of k components subjected to a common stress (Y), then the reliability of the system or system reliability
is given byR=P[Y<X
(k−s+1)] whereX
(k−s+1) is (k−s+1)-th order statistic of (X
1,…,X
k
). We estimate R when (X
1,…,X
k
) follow an absolutely continuous multivariate exponential (ACMVE) distribution of Hanagal (1993) which is the submodel of
Block (1975) and Y follows an independent exponential distribution. We also obtain the asymptotic normal (AN) distribution
of the proposed estimator. 相似文献
626.
627.
针对复杂边坡结构,将多个参数考虑成随机变量,利用矩阵理论推导了结构安全系数K和可靠指标β的矩阵通用计算公式,以及均质边坡结构对应的特例公式.结果表明,这些公式反映边坡稳定性的规律性,可为有限层边坡结构可靠性分析方法在实际工程中的推广使用提供方便,并为其模块化编程提供了理论依据. 相似文献
628.
通过对单层结构和多层结构的磁光记录介质TbFeCo在常温环境气氛条件和高温加速应力条件下的可靠性对比实验,以及对组成元素的XPS光电子能谱分析,证明了只有经过多层结构保护处理的磁光记录介质才具有高的稳定性。 相似文献
629.
夏铭 《长沙理工大学学报(社会科学版)》2001,16(3):107-108,119
多项选择题因具有较高信度而被广泛采用 ,但也因不能检测学生语言产出能力、效度较低而备受批评。为此提出一些提高多项选择题效度的方法 ,供测试命题者参考。 相似文献
630.
自组网可靠性评价方法 总被引:5,自引:1,他引:4
网络可靠性是网络性能评估指标的一个方面,对于网络系统级的性能评估有重要意义。该文通过构建随时间变化的表征网络节点连通性状态的关联矩阵,在节点故障和移动性变化的情况下,对自组网网络可靠性进行了研究,提供了一种自组网可靠性定量评价方法。通过大量的随机试验表明,该方法能有效验证自组网的可靠性。 相似文献