信息化条件装备战场维修资源保障问题研究

战场维修资源是实施战场抢修最重要的物质条件,借鉴美军装备"精确保障"理念思想,对信息化条件下装备战场维修资源保障问题进行了研究.通过分析信息、资源、效能三者关联关系和维修资源保障指挥管理过程,确定装备保障指挥管理系统功能模型.最后对支持战场维修资源保障系统的关键技术和相应建设对策展开探讨.     

硼介质／石墨水泥基材料电磁屏蔽性能实验研究

为增强水泥基材料的电磁屏蔽性能,通过混凝土骨料替换的方法,实验研究了碳化硼、硼砂及石墨组合对复合材料电磁屏蔽效能的影响规律。实验结果表明单纯的碳化硼或碳化硼一硼砂作为水泥基材料骨料时,样品电磁屏蔽性能提升有限,但在添加硼介质时引入适当比例的石墨能有效改善材料的电磁屏蔽性能;另外,硼砂的添加会造成样品明显的缓凝现象,并且会对石墨导电吸波机制产生负面影响。     

Locational tying of complementary retail items

We study a selling practice that we refer to as locational tying (LT), which seems to be gaining wide popularity among retailers. Under this strategy, a retailer “locationally ties” two complementary items that we denote by “primary” and “secondary.” The retailer sells the primary item in an appropriate “department” of his or her store. To stimulate demand, the secondary item is offered in the primary item's department, where it is displayed in very close proximity to the primary item. We consider two variations of LT: In the multilocation tying strategy (LT‐M), the secondary item is offered in its appropriate department in addition to the primary item's department, whereas in the single‐location tying strategy (LT‐S), it is offered only in the primary item's location. We compare these LT strategies to the traditional independent components (IC) strategy, in which the two items are sold independently (each in its own department), but the pricing/inventory decisions can be centralized (IC‐C) or decentralized (IC‐D). Assuming ample inventory, we compare and provide a ranking of the optimal prices of the four strategies. The main insight from this comparison is that relative to IC‐D, LT decreases the price of the primary item and adjusts the price of the secondary item up or down depending on its popularity in the primary item's department. We also perform a comparative statics analysis on the effect of demand and cost parameters on the optimal prices of various strategies, and identify the conditions that favor one strategy over others in terms of profitability. Then we study inventory decisions in LT under exogenous pricing by developing a model that accounts for the effect of the primary item's stock‐outs on the secondary item's demand. We find that, relative to IC‐D, LT increases the inventory level of the primary item. We also link the profitability of different strategies to the trade‐off between the increase in demand volume of the secondary item as a result of LT and the potential increase in inventory costs due to decentralizing the inventory of the secondary item. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009     

基于仿真的C~4ISR系统需求开发

C4ISR系统需求开发足系统开发的一项重要内容.提出基于仿真的C4ISR系统需求开发的方法,分析了面向仿真的C4ISR系统需求体系并给出了其构成,提出基于仿真的C4ISR系统需求开发过程,重点探讨了基于仿真的C4HSR系统需求验证支持技术,分析了需求验证仿真建模技术和基于需求描述生成需求验证仿真模型技术的实现途径,为基于仿真的C4SR系统需求开发提供了方法基础.     

应用中间件的C~4ISR系统关键技术

提出了基于中间件技术的C4ISR系统的体系结构,着重研究了中间件应用服务器的结构和关键技术实现,分别说明了通信中间件,消息中间件和数据库中间件的工作原理与方法,进行中间件的有效集成,讨论了中间件上的信息发布/订阅模型,举例说明了具体模块在中间件系统中的工作过程.     

196单片机在火控计算机中的应用

火控输出机是介于雷达和火炮之间的重要环节,在系统规定周期内,通过共享存贮器接收主机送来的位置和速度以及加速度数字量.完成数据插值、粗精分离.输出机在插值输出时与主机同步,并设计两种复位信号标志,手动复位和加电复位,使软件根据复位标志判断是否使火炮归零.火控输出机在火控系统中担当重要角色,它可根据火控主机解算后传输来的数据准确将火炮定位.     

C~4ISR系统任务实时性的评价方法

提出一种定量评价C4ISR(Command Control Communication Computer Intelligence Surveillance and Reconnaissance)系统任务实时性方法--时序着色模糊时间Petri网(TCFTPN)方法.用时序逻辑公式来限制着色Petri网的变迁引发行为,用模糊时间来表示各工作过程的时延特性和降级工作问题.通过估计在规定的时间内标识从任务开始状态到达任务完成状态的概率来确定C4ISR系统的任务实时性.     

气动力/推力矢量复合控制空空导弹最佳转弯规律

针对气动力/推力矢量复合控制空空导弹大离轴角发射的快速转弯问题,根据bang-bang控制理论,给出了导弹终端弹道角受限情况下,以最大末速为性能指标的最佳转弯规律.针对空空导弹纯气动力控制和复合控制两种情况,分别进行了初制导弹道的设计和仿真.结果显示,在中空低速发射时,采用后者转弯性能明显高于纯气动力控制导弹,而当初速高于1.2 Ma时,二者转弯性能非常接近.     

基于粗糙集理论的防空C~3I系统目标威胁度综合评判

目标威胁度的估计是防空C3I系统中辅助决策的基础,各个威胁因素权系数的确定历来缺乏严格的数学基础。针对此问题,提出应用粗糙集理论,对空防对抗中各种威胁因素的原始数据进行挖掘,利用其求得各项威胁因素的属性的重要度,进行权值化处理,使得各项威胁因素权系数的确定有效克服了传统方法的主观性,使得各项权系数的确定更具客观性,提高威胁度估计的准确性。     

警戒雷达情报数据模拟器的设计与实现

针对C3I系统中警戒雷达的扫描跟踪和雷达情报数据录取仪的数据处理以及有线传输功能进行模拟.该模拟系统包括两部分,目标情报数据的产生与数据的调制和输出.应用EVC编程实现了目标情报数据的生成和系统控制,系统数据调制采用2FSK,由FPGA编程实现.应用PC104总线和FPGA技术构建了硬件平台.