工业控制系统可靠性设计与测试评估技术研究

目前我国的工业控制系统发展迅速,但其可信性较低,为解决这一问题,我们开展了工业控制系统的可靠性设计和测试评估技术研究。研究形成了工业控制系统可靠性设计规范和工业控制系统可靠性测试评估规范,另外还生成了工业控制系统可靠性设计和测试评估的软件操作平台。     

可靠性增长管理探讨

可靠性增长管理的目的就是要尽可能地利用产品研制过程中各项试验的资源与信息,把非可靠性试验与可靠性试验结合起来,都纳入到以可靠性增长为目的的综合管理之下,经济地、高效率地促使产品达到预定的可靠性目标。本文对可靠性增长管理的基本内容进行了介绍。     

并行VOD系统的可靠性研究与实现

首先介绍了并行VOD系统,通过对当前流行的双机热备份方案的分析比较,提出了一种主从式总控技术,并以并行VOD系统为背景,阐述了其实现过程。     

Multi-Agent系统中Agent通信可靠性的研究

简要介绍了Agent的概念,及Multi-Agent系统通信的方式。提出Multi-Agent通信可靠度的概念。由系统可靠性理论导出Multi-Agent间通信的可靠度,为多Agent间通信建立了定量分析方法。     

FIFO可靠性设计与研究

FIFO(First In First Out先进先出队列)通常用于数据的缓存和适配不同时钟域之间的相位差和频率飘移,保证数据安全可靠地传输。通过系统地分析影响同步FIFO和异步FIFO可靠性的各个重要因素,提出了具体的解决方案。重点介绍了亚稳态问题及解决方案和空满标志的产生方法。     

供电可靠性系统与营配一体化平台集成设计与实现

中电联版供电可靠性管理系统,对基础数据和运行数据的录入要求很高,由于电网变化很频繁,靠管理人员手工维护数据,工作量非常大且容易出错,数据录入不及时或不准确都会直接影响到指标计算的准确性,给供电可靠性管理工作带来极大的不便,甚至会影响到供电企业的辅助决策。重点介绍广州供电局如何利用信息集成技术,实现供电可靠性系统与营配一体化平台的数据交换及信息共享,并对实践过程中发现的问题及处理办法进行探讨与研究。     

关于仿真可信度评估及仿真VV＆A的探讨

根据国内外仿真可信度及仿真系统的校核、验证与确认(VerificationValidationandAccreditation,VV&A)的研究现状,探讨了仿真可信度评估理论,重点研究了仿真可信度的概念和性质,仿真系统可信度评估的原则以及仿真可信度与仿真系统的校核、验证与确认(VV&A)之间的关系。同时,该文还运用一个简单的例子就仿真系统可信度评估与仿真系统的校核、验证与确认(VV&A)之间的关系作了一个简单、明确的阐述,使大家对仿真系统可信度评估与仿真系统的校核、验证与确认(VV&A)有一个更加清楚的认识。     

提高软件可靠性的跟踪技术研究

在一个大型的电子信息系统设计中,既要满足用户的需求,努力使功能更加完善,同时也要满足系统的可靠性要求。在系统可靠性设计中,除了选择稳定的硬件和UNIX操作系统外,应用软件的健壮性和可靠性更加重要。详细介绍了在SolarisUnix系统下,通过几种高效的程序跟踪技术,来提高应用软件的可靠性。     

一种软件可靠性增长模型选择与综合方法

软件可靠性增长模型可以预测软件在将来某个时刻的可靠性,以此作为软件是否发布的依据.而目前常见的各种模型对不同失效数据集的预测能力并不一致.提出了一种软件可靠性增长模型选择和应用的框架,利用可靠性模型评价准则,对特定的失效数据集选择优选模型集,根据优选模型集利用神经网络较好的学习预测能力计算可靠性.利用此方法对实际软件项目中的失效数据进行了分析,并验证了它的有效性.     

提高单片机应用系统可靠性的软件技术

软件抗干扰技术是抑制电磁干扰的重要手段。首先分析了电磁干扰对单片机应用系统造成干扰的主要后果，然后分别介绍了提高单片机应用系统可靠性的各种软件抗干扰技术。     

Substar Reliability Analysis in Star Networks

In this paper, we derive an upper bound on the (n − 1)-star reliability in an S_n using the probability fault model. Approximate (n − 1)-star reliability results are also obtained using the fixed partitioning. The numerical results show that the (n − 1)-star reliabilities under the probability fault model and the fixed partitioning are in good agreement especially for the low value of the node reliability. The numerical results are also shown to be consistent with and close to the simulation results. Conservative comparisons are made where possible between the reliability of similar size star graphs and hypercubes.     

云理论在作战飞机可靠性评估中的应用

传统的作战飞机可靠性评估一般采用定性评估方法,而对于精确的定量评估,目前尚缺有效的方法。云理论是一种用于处理不确定性和含糊性知识的数学工具,可实现概念与数据之间的相互转换。论文在云理论的基础上,建立了综合能力模型以及可靠性评估云模型,提出了一种新的具有可操作性的作战飞机可靠性评估方法,解决了可靠性评估中定性语言到定量的转化问题,使评估结果除了保留传统定性划分所具有的优点以外,也更加符合实际的数据分布和人的思维方式。论文最后给出了一个作战飞机可靠性评估的算例。     

大型网络系统可靠度计算软件的空间可压缩性理念及相应处理技术

针对用最小路集法求解网络系统可靠度这一问题阐述了大型网络系统可靠度计算软件设计中的空间可压缩性理念,同时介绍相应的空间压缩处理技术,从而指出大型网络系统可靠度计算软件优化设计的发展趋势。     

Reliability estimation in Lindley distribution with progressively type II right censored sample

In this paper we discuss one parameter Lindley distribution. It is suggested that it may serve as a useful reliability model. The model properties and reliability measures are derived and studied in detail. For the estimation purposes of the parameter and other reliability characteristics maximum likelihood and Bayes approaches are used. Interval estimation and coverage probability for the parameter are obtained based on maximum likelihood estimation. Monte Carlo simulation study is conducted to compare the performance of the various estimates developed. In view of cost and time constraints, progressively Type II censored sample data are used in estimation. A real data example is given for illustration.     

Reliability of the vertical spinal creep response measured in sitting (asymptomatic and low-back pain subjects)

Vertical spinal creep (or change in stature) has been used as an index of spinal loading, yet reliability of the testing protocol has not been fully examined. This study investigated the reliability of a vertical spinal creep response in 10 asymptomatic and five low-back pain subjects. Each subject performed the 25-min testing protocol, which consisted of three phases (5-min preload, 10-min loaded and 10-min unloaded), at the same time on two separate days. Good reliabilities in vertical spinal creep response between two days of testing were demonstrated for both asymptomatic and low-back pain subjects.     

大规模发布／订阅系统中的可靠性模型

大多数Internet上的大规模发布/订阅系统,其覆盖网络是不可靠的,系统的可靠性和处理故障的能力是一个挑战性的问题.基于轨迹序列和线性时态逻辑定义系统的可靠性条件,是路由算法可靠性分析的基础.设计了崩溃/恢复模式的路由协议,维持一致的、共享的系统状态,有效地处理具有局部性、临时性的路由器故障和链路故障.     

核电系统的故障树可靠性定量分析数字仿真

故障树分析是核电站概率安全评价的重要方法,该文在介绍利用蒙特卡罗方法进行故障树定量分析仿真建模原理后,根据故障树所表示的系统模型的特点,绘制了故障树定量分析的程序框图,并根据框图编写了MATLAB程序.通过实例开发运用,证实该方法的有效性和可操作性.同时,我们还发现运用该方法计算可靠性,可以观察到系统中的各底事件对整个系统的影响程度,这对核电设备的设计、维修和改造具有很大的指导意义.     

Reliability of myoelectric trapezius muscle activity in repetitive light work

The aim of this study was to evaluate the reliability of selected electromyographic (EMG) parameters describing the muscle activity in repetitive light work. EMG from the trapezius muscle of twelve female workers were recorded during a 20-min work session, morning and afternoon; Monday, Wednesday, Friday and the following Monday. The estimated reliability coefficient was 0·59 for static muscle activity and 0·85 for short interruptions in muscle activity (EMG gaps) during work. The reliability coefficient was 0·94 for the EMG signal's average median frequency of test contractions associated with the work session. The median frequency declined significantly during the work session. No time trend was found during the day or the week for these parameters. Consequently, it is possible to get representative measurements of the mentioned EMG parameters during repetitive light work by a recording taken at any time of the day or week.     

通用即插即用(UPnP)体系架构在可靠性方面的改进与实现

对目前较新颖的开放标准,通用即插即用(Universal Plug and Play,UPnP)体系架构进行研究并提出改进可靠性的思路。对通用即 插即用体系的术语、网络协议的交互使用以及工作流程做了研究。提出实际应用中存在的可靠性问题,并给出状态服务器的网络逻辑模型以 维护通用即插即用网络上的设备可用信息。     

Lifetime analysis based on the generalized Birnbaum-Saunders distribution

In this paper, we consider a family of generalized Birnbaum-Saunders distributions and present a lifetime analysis based mainly on the hazard function of this model. In addition, we carry out maximum likelihood estimation by using an iterative algorithm, which produces robust estimates. Asymptotic inference is also presented. Next, the quality of the estimation method is examined by means of Monte Carlo simulations. We then provide a practical example to illustrate the obtained results. From this example and based on goodness-of-fit methods, we show that the GBS distribution results in a more appropriate model for modeling fatigue data than other models commonly used to model this type of data. Finally, we estimate the hazard function and the critical point of this function.