基于粗糙集理论的一种综合定权法

基于粗糙集理论中信息量的概念提出了一种新的主观定权法,再以优化理论为依据建立了综合定权的优化模型,并给出了模型的精确解,据此推导出了一种兼顾主观偏好和客观信息的综合权重赋值法,最后给出了一个应用实例说明了这种定权方法的有效性.     

Drone usage by militant groups: exploring variation in adoption

Judging by recent media reporting and pronouncements by senior US military and security officials, the use of drones by militant groups is both reshaping conflict between armed non-state actors and state parties and now presents a grave and direct threat to nations in the West and elsewhere. But does this threat warrant the attention it is currently receiving? To answer this question, this article surveys how various militant groups have used drones both tactically on the battlefield and for wider strategic purposes. Closely examining how drones have been employed and by whom provides a basis for understanding variation in adoption. The article shows how drone usage or non-usage is highly contingent on the setting of the conflict, the aims of different groups, and the capacity of groups to adopt the technology. Though advances in drone technology could make the use-case more appealing for militant groups, drones will be subject to the same back-and-forth, techno-tactical adaptation dynamic between adversaries that have accompanied prior military innovations.     

Competitive location and capacity decisions for firms serving time‐sensitive customers

In this article we explore how two competing firms locate and set capacities to serve time‐sensitive customers. Because customers are time‐sensitive, they may decline to place an order from either competitor if their expected waiting time is large. We develop a two‐stage game where firms set capacities and then locations, and show that three types of subgame perfect equilibria are possible: local monopoly (in which each customer is served by a single firm, but some customers may be left unserved), constrained local monopoly (in which firms serve the entire interval of customers but do not compete with each other), and constrained competition (in which firms also serve the entire interval of customers, but now compete for some customers). We perform a comparative statics analysis to illustrate differences in the equilibrium behavior of a duopolist and a coordinated monopolist. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

轻集料钢筋混凝土梁受弯性能试验研究

轻集料混凝土应用于港口工程是一个待研究的课题.通过对4根轻集料钢筋混凝土梁和2根普通混凝土梁进行的抗弯对比试验,研究了轻集料钢筋混凝土粱的抗弯力学性能.结果表明,轻集料钢筋混凝土梁在承受正常荷载时,其力学性能与普通混凝土梁相比无明显差异;在破坏时脆性较同等级普通混凝土粱略大,延性略差.但考虑到轻集料混凝土的优点,在实际工程中可代替普通混凝土受弯构件工作.     

Revenue management with aircraft reassignment flexibility

A well‐studied problem in airline revenue management is the optimal allocation of seat inventory among different fare‐classes, given a capacity for the flight and a demand distribution for each class. In practice, capacity on a flight does not have to be fixed; airlines can exercise some flexibility on the supply side by swapping aircraft of different capacities between flights as partial booking information is gathered. This provides the airline with the capability to more effectively match their supply and demand. In this paper, we study the seat inventory control problem considering the aircraft swapping option. For theoretical and practical purposes, we restrict our attention to the class of booking limit policies. Our analytical results demonstrate that booking limits considering the swapping option can be considerably different from those under fixed capacity. We also show that principles on the relationship between the optimal booking limits and demand characteristics (size and risk) developed for the fixed‐capacity problem no longer hold when swapping is an option. We develop new principles and insights on how demand characteristics affect the optimal booking limits under the swapping possibility. We also develop an easy to implement heuristic for determining the booking limits under the swapping option and show, through a numerical study, that the heuristic generates revenues close to those under the optimal booking limits. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

无标度网络上的队列资源重分配策略

在实际的通信系统中,由于物理条件的限制,每个节点都具有有限长度的队列。研究了在有限队列资源的条件下,队列资源对无标度数据流动力学的影响。提出了一种队列资源重分配策略,策略中节点的队列长度与节点的介数成正比。仿真结果表明,在无标度网络中使用最短路径路由的条件下,所提出的重分配策略可以有效地改进网络的容量。同时对有限队列资源条件下的网络容量进行了理论分析。     

武警部队重大改革必须向“能打胜仗”的战斗力聚焦

从关于国防和军队重大改革的重要论述入手,系统地阐述了武警部队重大改革必须向“能打胜仗”的战斗力聚焦。主要从三个层面进行分析：一是向提高部队整体素质及优化规模结构聚焦;二是向提高部队武器装备保障效能聚焦;三是向增强部队以执勤处突为中心的军事能力聚焦。     

带运力限制及单边时变约束下多出发机场航空战略投送兵力分配模型研究

利用民航力量由多个机场向一个目标机场实施航空战略投送时,由于各民航机场都具有运力限制约束,不可能无限制地快速投送兵力,因此,考虑了在多个出发机场存在运力限制约束的情况下,构建了"投送时间最短,动员机场最少"多目标决策模型,并给出了优化算法和算例.     

大容量数据下基于DTN的链路中断优化传输技术

激光或GHz以上的高频链路的应用将导致DTN(Delay Tolerant Network)网络链路数据容量的增大,大容量数据链路的间歇性中断将严重影响数据的传输效率。针对DTN网络中大容量数据链路频繁中断和节点的剩余缓存空间剧烈变化的问题,提出在DTN路由算法上增加拥塞状态预测机制和易中断链路判定机制,根据节点的拥塞程度定义惩罚函数,缓解链路中断和节点资源受限导致的拥塞。仿真结果表明,该机制可以有效提高DTN网络的传输性能。     

弹药生产响应能力综合评价指标权重组合方法

针对战时弹药需求的不确定性而造成对生产能力冲击的特点,为科学地确定综合评价指标权重,评价军工企业弹药生产响应能力,运用基于偏差平方和最小的综合评价指标粗糙集与网络分析法的权重组合算法,将定性与定量评价方法相结合,为客观评价企业弹药生产响应能力提供了科学的依据,对提高弹药生产决策的军事经济效益具有重要的意义。