k/N系统的多阶段任务可靠度模型

k／N热备份冗余系统已被广泛应用在现代高科技装备中．而对于某些k／N系统的k并不是一成不变的．而是根据实际任务而变化的．并且某些系统还存在一定数量的冷备份冗余部件。给出一种存在冷备份冗余部件且k随阶段变化而变化的k／N系统的多阶段任务可靠度模型，通过该模型可以为确定系统在完成特定任务情况下的热、冷备份部件数量提供决策依据．为该类系统的设计提供决策支持。     

New model for load-sharing k-out-of-n:G system with different components

On the basis of capacity flow model,a new model is developed for a load-sharing k-out-of-n:G system consisting of different components,to describe the increase of the same component's failure rates under different loads.All components have exponential life distributions and are nonrepairable in the system.Reliability of load sharing 2-out-of-3:G system is calculated and some special cases for the system are discussed.The calculation and discussions show that the model is right and practical.     

STRONG LAWS OF LIFETIME FOR A CONSECUTIVE K-OUT-OF-N: F SYSTEM

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Importance measure of system reliability upgrade for multi-state consecutive k-out-of-n systems

Importance measures in reliability systems are used to identify weak components in contributing to a proper function of the system. Traditional importance measures mainly concerned the changing value of the system reliability caused by the change of the reliability of the component, and seldom considered the joint effect of the probability distribution, improvement rate of the object component. This paper studies the rate of the system reliability upgrading with an improvement of the component reliability for the multi-state consecutive k-out-of-n system. To verify the multi-state consecutive k-out-of-n system reliability upgrading by improving one component based on its improvement rate, an increasing potential importance (IPI) and its physical meaning are described at first. Secondly, the relationship between the IPI and Birnbaum importance measures are discussed. And the IPI for some different improvement actions of the component is further discussed. Thirdly, the characteristics of the IPI are analyzed. Finally, an application to an oil pipeline system is given.     

基于马尔可夫过程的k/n(G)系统共因失效分析

利用马尔可夫过程研究了发生共因失效的k/n(G)系统可靠度计算方法。建立了共因失效时部件全部失效和共因失效时多个部件失效这两种情况下,不可修系统和可修系统的马尔可夫模型。分析了系统部分部件属于共因失效组的可靠度计算方法。利用算例验证了所建立的模型的有效性,结果显示,所建立的马尔可夫模型适用范围广,计算方便。     

软件可靠性与费用权衡

软件可靠性与费用的关系是辩证的 :一方面增加可靠性可以减少软件的维修费用 ,避免软件因可靠性低不能使用所造成的开发费用的浪费 ;另一方面增加软件可靠性 ,大都以增加软件开发费用为代价 ,而软件成本的提高又制约了软件的销售和推广。对软件可靠性分配和软件测试终止时间的确定进行了深入分析 ,通过这两条途径实现了软件可靠性和费用的权衡。在此基础上 ,给出了在软件工程中权衡软件可靠性与费用的其它方法。     

多机场网络系统流量分配策略

为有效减少机场交通拥挤、降低航班延误,从系统角度研究战略层面的机场交通供需平衡问题.通过考虑单机场进场和离场间的相关性以及多机场联程航班间的关联性,提出了开放式多机场有向网络交通流系统;基于多元容量受限约束和联程航班约束,以最小化网络系统内所有航班的总延误为目标,建立了开放式多机场网络配流模型.结合国内三大机场的实际航班数据,对模型进行了仿真验证.仿真结果表明:所建模型可以对多机场网络系统流量与容量进行协调优化匹配,充分利用系统容量最小化系统航班延误;可为空管部门提供流量调配优化策略、为民航部门制定航班计划提供辅助决策依据.     

产值优化模型与技术进步测算研究

生产函数与Ｌｅｏｎｔｉｅｆ投入产出模型是目前测算技术进步方法的理论基础，但它们必须在满足各自的经济假设下才能成立，导致测算技术进步方法的局限性，在实际应用中存在一系列的问题。本文从产值优化角度探讨技术进步的测算，提出了技术进步产值优化模型分析法。这种新方法没有任何经济假设，不仅能从产出总量上分析技术进步，而且能测算体现技术进步各个因素的作用。在大冶有色金属公司应用的实证研究，说明这是一种行之有效的     

发射场供配电系统可靠性分析

航天发射场的供配电系统是给发射场提供动力的关键设备 ,直接影响发射场的可靠性。采用可靠性框图分析方法 ,根据系统正常工作状态和故障状态的定义 ,提出了发射场供配电系统的可靠性模型和可靠性分析方法。提出的分析方法 ,可用于航空、航天、机械等领域的双电源、双回路供配电方式的可靠性建模和可靠性分析 ,以及复杂的单输入、多输出系统的可靠性分析     

基于指派模型的导弹装备体系弹种优化设计

针对体系作战中多弹种协同完成多类型作战任务的需求, 建立了以导弹装备体系效能为引导的弹种优化设计结构框架, 以综合考虑任务、成本和风险影响因素的装备体系效能最优为目标, 构建了指派模型, 并给出了该模型的约束条件。针对该优化问题的可行解空间较大、计算时间较长的特点, 设计了基于作战环的模型快速求解方法, 以加快设计过程。算例分析结果表明: 该指派模型能够实现导弹装备体系中最优弹种设计方案的求解, 同时引入作战环可以极大地缩小可行域, 从而显著提高设计计算效率。     

武器-目标分配问题的粒子群优化算法

建立了武器-目标分配问题的优化模型,分析了各种解决此模型的方法的优缺点。经典的粒子群是一个有效的寻找连续函数极值的方法,结合遗传算法的思想提出粒子群算法来解决武器-目标分配问题。经过比较测试,4种粒子群算法的效果都比较好,特别交叉策略A和变异策略B的混合粒子群算法是最好的且简单有效的算法。     

OPTIMAL IMPULSIVE HARVESTING FOR FISH POPULATIONS

In this paper the management model a two-species fishery involving impulses is investigated by using optimal impulsive control theorem. Optimal impulsive harrowing times and the corresponding optimal harvesting population levels in different cases are obtained.     

Weapon target assignment problem satisfying expected damage probabilities based on ant colony algorithm

A weapon target assignment （WTA） model satisfying expected damage probabilities with an ant colony algorithm is proposed. In order to save armament resource and attack the targets effectively, the strategy of the weapon assignment is that the target with greater threat degree has higher priority to be intercepted. The effect of this WTA model is not maximizing the damage probability but satisfying the whole assignment result. Ant colony algorithm has been successfully used in many fields, especially in combination optimization. The ant colony algorithm for this WTA problem is described by analyzing path selection, pheromone update, and tabu table update. The effectiveness of the model and the algorithm is demonstrated with an example.     

遗传思想在最优控制动态交通分配中的应用

以遗传思想为基础设计了模拟优化算法,大幅度降低了优化计算时间,大大提高了动态交通分配模型的实用价值。     

OPTIMAL ADAPTIVE CONTROL WITH CONSTRAINT FOR ARMAX MODEL

For the ARMAX system with unknown coefficients the optimal adaptive control isdesigned so that the following requirements are met simultaneously:1)the transfer function from areference signal to the system output in the closed loop equals a prescribed rational function;2)under the constraint mentioned in 1)a quadratic loss function is minimized;3)the parameterestimate is strongly consistent.     

一种新的优化方法:β算法

提出了一种新的求解全局最优问题的算法。该算法适合求解非线性、非凸、包含多个局部最优解的最优化问题,且对所求解的问题没有很强的前提条件,适用范围宽广,该算法利用了目标函数超曲面在可行域中的起伏,对可行域进行分割压缩,并最终收敛于某个全局最优解。最后通过实例与模拟退火算法进行了比较,检验了其优异的鲁棒性和收敛速度。     

ON A PROPERTY OF SOLUTIONS OF M-MATRIXEQUATIONS

1.IntroductionConsideringthefollowingsystemoflinearequationsAx~b(l.1)whereAisannxnM-matrix,bisanndimensionalvectorandbeRang(A).Theresearchonthesolutionofequation(1.1)isveryimportantinLeontiefmodelofinput-outputanalysis(see[1,2]).G.St..k.ma[Zjstudiestheabo…     

Survey of the research on dynamic weapon-target assignment problem

1 .INTRODUCTIONThe nature of modern war has been changed withthe advent of long-range and precision weapons ,together with advanced sensors and informationsystems[1].Compared with the traditional warfareinindustrial age , great revolution has taken placein the modern war in the information age ,in suchfields as the operational theory ,structure of armyand the way of command and control (C2) . Withthe development of newtechnology ,the operationstyle of modern warfare has been changing from…     

A POLYNOMIAL ALGORITHM FOR FINDING A BUMP OPTIMAL EXTENSION OF AN ORDERED SET

A polynomial algorithm for finding a linear extension of an ordered set which has theminimum bumps is presented.     

武器系统贮存可靠性的三种预测模型的比较

本文参照可靠性增长模型的思想，建立了三种贮存可靠性预测模型。应用已往的评估数据，对模型进行检验。结果表明，这三种模型基本可用。