基于熵权的机械传动系统方案评价的模糊AHP法

针对机械传动系统涉及因素较多且各因素具有不同程度的模糊性的特点,分析了机械传动系统方案的评价指标,建立了方案评价指标体系,并运用基于熵权的模糊层次分析法(AHP)建立了机械传动系统方案评价模型.以一个带式输送机的传动方案为例,成功选出了适合已知工况的最佳方案,验证了方法的有效性.     

基于熵权的导弹型号论证方案评价模型

针对导弹型号论证决策中的部分属性信息具有模糊性,给出了一种基于熵权的模糊信息多目标决策方案评估方法。该方法在只有模糊判断矩阵而没有专家权重的情况下,通过多指标的模糊评价矩阵的熵权计算,得到各属性信息提供的有用信息量的程度;再通过各方案与理想点的距离,得出了可信度较高的优选方案。     

Capacitated warehouse location model with risk pooling

In this article, we introduce the capacitated warehouse location model with risk pooling (CLMRP), which captures the interdependence between capacity issues and the inventory management at the warehouses. The CLMRP models a logistics system in which a single plant ships one type of product to a set of retailers, each with an uncertain demand. Warehouses serve as the direct intermediary between the plant and the retailers for the shipment of the product and also retain safety stock to provide appropriate service levels to the retailers. The CLMRP minimizes the sum of the fixed facility location, transportation, and inventory carrying costs. The model simultaneously determines warehouse locations, shipment sizes from the plant to the warehouses, the working inventory, and safety stock levels at the warehouses and the assignment of retailers to the warehouses. The costs at each warehouse exhibit initially economies of scale and then an exponential increase due to the capacity limitations. We show that this problem can be formulated as a nonlinear integer program in which the objective function is neither concave nor convex. A Lagrangian relaxation solution algorithm is proposed. The Lagrangian subproblem is also a nonlinear integer program. An efficient algorithm is developed for the linear relaxation of this subproblem. The Lagrangian relaxation algorithm provides near‐optimal solutions with reasonable computational requirements for large problem instances. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

基于熵权多目标决策的雷达网战损装备抢修排序方法

分析了熵权的理论基础,给出了一种基于熵权多目标决策的雷达网战损装备抢修排序方法。其中,采用熵权与决策者的主观权重相结合的方法确定综合权重,使权重的确定更加合理。最后通过实例对该方法的可行性和实用性进行了说明。     

基于熵权的舰炮武器系统维修保障能力模糊综合评判

针对现有装备维修保障体制的特点,建立起舰炮武器系统维修保障指标体系,综合运用熵权和模糊综合评判法对某型舰炮武器系统维修保障能力进行评估。该方法用熵权确定权重,加重了评价体系本身的重要程度,充分利用了被评判指标的信息量,并且根据模糊评判的需要构造了评分隶属函数,使定性分析和定量分析很好的相互融合。仿真结果表明该方法可行,对科学、客观地评估舰炮武器系统维修保障能力有一定的应用价值。     

基于神经网络的超精密机床伺服进给非线性模型辨识

以双轴Ｔ型结构的超精密金刚石车床的伺服进给系统为研究对象,采用自构造神经网络技术,建立了系统的非线性动态数学模型,为系统非线性控制与补偿提供参考模型     

DES密码旁路立方体分析

将立方体分析和旁路攻击结合,基于8位汉明重泄露模型,首次对DES分组密码抗旁路立方体攻击安全性进行了评估．在黑盒攻击场景下,攻击者首先按照一定规则生成立方体和超多项式,然后利用不同选择明文,计算其在加密过程某比特的高阶差分,判断该立方体对应的超多项式是否合法．对DES加密输出第l轮输出不同字节进行了黑盒旁路立方体攻击实验,结果表明：未经防护的DES密码易遭黑盒旁路立方体攻击;如果攻击者能够精确获取加密第1轮输出某一字节的汉明重泄露,最好的攻击结果为2＾9.35个选择明文可将DES主密钥搜索空间降至2＾15．     

Allocating the U.S. Department of Defense Budget: Revisiting the ‘Incremental/Fair Share Model’

Abstract

This article examines the ‘incremental/fair share model’ that was proposed by Alex Mintz in 1988 concerning the budget allocation of the U.S. Department of Defense. Although Mintz was unable to confirm the correctness of his model, this study demonstrated it to be statistically significant. In the statistical analyses, I used the two-stage least squares method and Durbin’s h-test to better scrutinize the model’s adequacy. Few previous studies have addressed the allocation of the U.S. defence budget; consequently, the incremental/fair-share model should constitute a starting point for further research on the U.S. defence budget allocation.     

STCN的对岸打击时间协同冲突消解研究

为验证航空兵对岸打击中时间协同计划的可行性以及快速地调整时间协同计划,建立了任务间的简单时间约束网络(STCN),并转化成权值矩阵的形式.根据权值矩阵特点,提出了一种检测STCN一致性的权值矩阵法,大大降低了算法复杂度.为加快时间协同计划的调整速度,基于检测结果,提出了一种代价最小的冲突消解方法,避免了消解过程中的重复检测问题,提高了效率,使计划调整更加快捷高效.     

基于四元模糊数的鱼雷作战效能评估权重分析

权重计算是鱼雷作战效能评估中的一个关键问题,通常采用层次分析法计算指标权重.作为一种主观赋权方法,层次分析法忽略了专家经验的模糊性,基于此,提出了四元模糊数层次分析法确定指标权重.该方法将传统层次分析法判断矩阵的元素由一个确定的数推广到含有模糊信息的四元模糊数,并给出了方法模型和计算步骤.采用所提方法进行了鱼雷作战效能评估指标权重应用实例的计算,结果表明该方法是一种行之有效的权重计算方法.