Reliability of a 2-Unit Standby Redundant System with Repair, Maintenance and Standby Failure

A repairable 2-unit warm-standby system with repair and preventive maintenance is discussed. Two models are presented. In each of the models the mean time to system failure and the steady state availability are calculated. Some numerical calculations illustrate the results.     

Reliability of a 2-Unit Standby Redundant System with Constrained Repair Time

This paper considers a 2-unit warm-standby redundant system with repair. The repair of a failed unit is constrained as follows: Associated with each failure of a unit is a random variable termed the Maximum-Repair-Time (MRT) of the failure. If the repair of a failed unit is not completed within the MRT, the unit is rejected for further use. Two types of failure stituations for the system are considered: 1) No allowed down time, and 2) Some allowed down time. Expressions for the Cdf of the Time to System Failure (TSF) and the mean TSF are derived by using Markov renewal processes.     

Time Dependent Solution of a Complex Standby Redundant System under Preemptive Repeat Repair Discipline

The system has two classes of components. Each component in one of the classes is essential to operation. Components in the other class are helpful but not essential. The Laplace transforms of various state probabilities have been obtained; a particular case has been derived.     

Analysis of 7 Models for the 2-Dissimilar-Unit, Warm Standby, Redundant System

The paper is in 2 parts. In all models the failure rates are constant, but repair rates need not be constant. The method of supplementary variables is used for solving the models. Part I considers the effect of priorities on reliability and availability for 4 basic models; 1) priority in both repair and operation; 2) priority in repair; 3) priority in operation; 4) no priority. Models 1 and 2 treat 2 repair disciplines: a) preemptive-repeat, b) preemptive-resume. We obtain 1) Laplace transforms of availability and reliability and 2) explicit expressions for steady state availability and for mean time to system failure. The effect of priority assignment to maximize steady state availability is discussed. Part II considers the effect of having different repair rates, depending on whether the failure was from standby or from operation. We obtain 1) Laplace transforms of availability and reliability and 2) explicit expressions for mean time to system failure.     

A Two-Unit Cold Standby Repairable System with One Replaceable Repair Facility and Delay Repair: Some Reliability Problems

1 Model and Assumption In reliability analysis of repairable systems, it is usually assumed that the repair facility neither fails nor deteriorates as well as the repairman is instantaneously available. So that the repair is started immediately upon the failure of a unit provided that he is not busily repairing another unit. However, in actual practice, the repair facility in a repairable system is subject to failure and can be replaced (or can be repaired) after it fails, and certain delay ac…     

洁净手术室使用中应注意的几个问题

结合医院外科手术室工作实践中出现的问题，根据国家相关标准和规范的要求，提出解决问题的具体措施和建议。     

Unreliability of a Standby System with Repair and Imperfect Switching

We evaluate and analyze a model of a 2-unit standby system with repair and imperfect switching. The model determines the cumulative probability that system failure occurs in a time interval 0 to T. In order to cope with arbitrary failure-time and repair-time distributions, a ``step by step' method is used which for practical purposes yields a sufficiently accurate result. The model results in explicit expressions which are very suitable for computer implementation. A simple illustrative example is given.     

Reliability Programs and the Problem of Attaining High Probabilities of Mission Success in Space Exploration

The major obstacles to attaining high probabilities of mission success in future space exploration are described to be as follows: dependence on large numbers of propulsive stages in a given vehicle development of relatively many more long-lived components and subsystems than has been possible to achieve to date heed to improve the development process so that a reletively much ower volume of ground and flight testing is needed than formerly to provide confidence in system reliability and fragmentation of responsibilities for flight tests and for technical direction of major programs. Moreover, it is suggested that several aspects of current approach to ``reliability' might be doing more harm than good, It is then argued that Broader and more uninhibited discussion of difficulties to attainment of high probabilities of mission success is much needed, as well as more widespread, systematic, and intense search for posible failure modes at the system, subsystem, component, and part levels; 3) general persuasion that when reduction in funds occur, that the must largely go into stretching out schedules and not into reducing the volume of ground and flight testing; integrity of communication throughout the mtitiplicity of participating elements and the conviction that, reliability engineering is an inseparable integral aspect of systems engineering.     

Initial Provisioning of a Standby System with Deteriorating and Repairable Spares

A technique is developed for finding the time dependent operating probabilities used by reliability systems designers for provisioning a system with N + k identical units, k of which are called spares and N called operating units, and s repair facilities. System failure occurs when less than N units are operational. Units fail with exponential interfailure times and are repaired with exponential service time. Idle spares fail due to deterioration at a rate possibly different from that of the operating units. Graphs are presented which show the minimum numbers of spares needed to achieve system reliabilities of 0.90 and 0.99 as a function of time. The technique is applicable for finding, numerically, the first passage time distribution for any system modeled by birth and death processes.     

新建煤矿监测监控系统中值得注意的几个问题

论述了建设煤矿监测监控系统的意义，计算机控制系统的一般构成和分类，提出了在新建煤矿监测监控系统时应该注意的几个问题。     

TDMoIP关键问题的研究与系统实现

随着传统TDM信息流向高性能分组主干网迁移成为潮流，TDMoIP技术由于其优势所在，发展日新月异。针对国内研究尚处起步阶段的现状，对TDMoIP关键问题进行分析和研究，并提出新颖的解决方案。最后给出用于IP和以太网环境下的E14路TDMover IP转换器的设计方案，具有一定的实践指导意义。     

一个微内核操作系统的设计与实现

设计并实现了一个运行在Bochs虚拟机上的微内核结构的操作系统,详细描述了系统中进程管理、进程间通讯、基本内存管理、磁盘服务器以及文件服务器的设计和实现。并将实现的系统应用于安全路由器的开发中。本系统的实现将有利于从微观上观察操作系统的行为特征,更好地学习、理解和实践微内核机制。同时,也为面向特定应用开发嵌入式操作系统提供了实践经验。     

数据中心供电系统规划设计中的若干问题

规划设计是机房基础设施建设中最重要的环节。各种规模的数据中心运行实践表明,科学的规划设计是数据中心各种预期功能能否实现的关键,数据中心运行后的绝大多数问题也都起源于规划设计。文中根据当前数据中心供电系统建设和运行的情况,提出并分析了供电系统在规划设计阶段普遍存在的1O个问题,内容的重点在于提出问题,仅供数据中心用户信息主管和设计院工程设计人员参考。     

CATV网络设计与施工应重点把握的几个问题

针对CATV网络设计、施工中防雷击、抗风吹、易维护等问题，分析了在CATV网络中容易遭受雷击、风吹的关键部位和部件，并提出解决办法。     

VC5416的几点问题及其与FLASH的引导系统的设计

文中介绍了TMS320VC5416在实际应用中的几个值得注意的问题.同时也介绍了VC5416与存储器FLASH构成的DSP引导系统的具体连接方式与操作方法,通过例子详细地说明了如何通过DSP芯片将程序烧写入FLASH,使FLASH与DSP芯片构成独立系统的步骤和方法,具有较强的实用性.     

双机冷备计算机信号切换的设计与实现

双机冗余冷备份足提高计算机系统可靠性的冗余设计方式之一,而信号切换作为双机冗余冷备份计算机系统实现的关键功能,承担着两套巨为冷备的计算机I/O接口的正确、可靠的选择与切换,是影响整个系统可靠性的重要环节.本文介绍了一种信号切换模块的设计原理和实现方法,该信号切换模块已经实际使用验证,性能和可靠性满足预期目标.     

定期预防维修是提高无人值守冗余系统可靠性的新途径

可靠性是无人值守系统的关键难点，通过对冗余没施可靠性变化特性的讨论，提出并证明了预防维修是解决无人值守系统可靠性设计的有效途径。     

在初步使用DSP的CCS系统时所遇问题的解答

本论文为初学DSP数字信号处理器的读者提供了一些在刚刚使用D印时,经常遇到的一些问题的解决方法.     

一种基于VME总线双余度容错处理系统的设计与实现

VME总线是具有高可靠性的并行总线,在机载嵌入式系统领域受到广泛应用。文章首先对VME总线结构进行了分析,然后描述了用双机数据处理系统的组成与工作原理,最后重点说明了双机数据处理系统VME总线接口逻辑与系统容错设计方法。