两次世界大战之间英法德三国装甲部队建设思想与实践之比较(一)

装甲部队的创建是军队建设史上的重大军事创新成果,它引发了第二次世界大战中的陆战变革,并戍为机械化军事革命的重要组成部分.由于建军指导思想的巨大差异,两次世界大战之间英法德三国装甲部队的建设走过了不同的道路,表现出不同的特点,产生了不同的经验和教训.对第二次世界大战的初期战局产生了重大影响,给后人以重要启示:军事改革与创新的先决条件之一,是建立一种适合于改革与创新的组织环境与军事文化氛围.     

基于LUT的射频预失真技术

分析了当前文献中几种主要的预失真结构,发现这些预失真结构均不适用于多通道宽频带短波通信中高功率放大器的线性化.提出了一种新的数字射频预失真方案,该方案能够完全适应短波宽频通信的高精度、多通道、宽频带的要求,而且不需要使用射频非线性有源器件.仿真结果表明,在短波通信系统采用这种方案,可以在很大程度上改善功率放大器的线性度.     

军用电传动车辆混合动力系统能量管理技术

混合动力系统是军用电传动车辆具有优越性能的基础,能量管理技术则负责实现负载需求在系统中各动力源间的合理分流及部件的优化控制,是军用车辆混合动力系统研究的关键技术之一。分析了军用车辆混合动力系统的特点,研究了其对系统能量管理的影响,总结了当前能量管理技术研究现状,最终,针对当前能量管理技术存在的问题提出了相应的解决方案。     

Fulfillment by Amazon versus fulfillment by seller: An interpretable risk-adjusted fulfillment model

With dual-channel choices, E-retailers fulfill their demands by either the inventory stored in third-party distribution centers, or by in-house inventory. In this article, using data from a wedding gown E-retailer in China, we analyze the differences between two fulfillment choices—fulfillment by Amazon (FBA) and fulfillment by seller (FBS). In particular, we want to understand the impact of FBA that will bring to sales and profit, compared to FBS, and how the impact is related to product features such as sizes and colors. We develop a risk-adjusted fulfillment model to address this problem, where the E-retailer's risk attitude to FBA is incorporated. We denote the profit gaps between FBA and FBS as the rewards for this E-retailer fulfilling products using FBA, our goal is to maximize the E-retailer's total rewards using predictive analytics. We adopt the generalized linear model to predict the expected rewards, while controlling for the variability of the reward distribution. We apply our model on a set of real data, and develop an explicit decision rule that can be easily implemented in practice. The numerical experiments show that our interpretable decision rule can improve the E-retailer's total rewards by more than 35%.     

基于SOPC技术的战车综合显控终端设计

通过战车乘员综合显控终端,战车成员可以快速准确地获取战车的各种状态信息,从而大大提高指挥员的判断能力。基于SOPC技术的战车综合显控终端,在单片FPGA内部集成了微理器系统、各种接口控制器、DSP协处理器以及用于液晶显示控制的液晶屏硬件控制器等,具有集成度高、处理能力强、可靠性高、设计灵活、硬件可在系统升级等众多优点。     

基于功能部件的指挥控制系统软件设计

传统的基于嵌入式的指挥控制系统软件按照面向过程进行设计，模块化程度低、复用性差，维护、移植困难。提出了功能软件的部件化设计方法，建立了嵌入式实时系统下基于功能部件的软件体系结构，并简要给出了基于功能部件的软件开发流程。实际应用表明：功能部件具有低耦合、高内聚等优点，且易于实现并行开发、调试；基于部件的软件体系结构清晰，具有较好的健壮性、开放性和移植性，可快速构建面向不同任务的指挥控制系统，显著缩短系统的开发时间、降低系统开发成本、提高系统开发效率。     

四川震区重建中的建筑环境创造初探

汶川大地震对灾区人民造成了物质和精神上的双重伤害，物质上的损失可以逐渐恢复，但心理上的伤害是持久的。震后的生活环境会对人的感知、体验与理解产生全方位的影响，并且这个影响是长期而持续的。根据“汶川地震灾区居民需求快速调查”的数据和震后一年来灾区人民的心理行为特征，利用环境心理学的相关知识对部分重建实例进行分析，从居住环境、公共环境、纪念环境三个方面对震后重建的环境创造进行探讨。     

一种改进型PSO-BP算法在红外目标中的应用

为了降低伪目标引起的误检,提高系统在复杂环境中的目标识别能力,设计了一种改进型粒子群优化BP神经网络算法。改进型PSO-BP算法利用红外目标光谱特性设置粒子变异规则,从而调整粒子位置与速度,提高目标特征提取性能。同时,算法将权值变为权值可调函数,降低局部极值收敛的风险。实验采用Model-102F型成像光谱仪采集的目标区域图像作为样本与检测数据,与传统BP算法作对比,分别选取对不同特征波长位置及个数的形式对目标和伪目标进行识别分析。结果显示,改进型PSO-BP算法可以有效消除伪目标干扰,同时,其收敛速度明显优于传统算法。由此可见,该设计在复杂背景红外目标识别方面具有一定的应用价值。     

Purchase and retrieval competition for seasonal produce

We study the competition problem of purchase and multiretrieval of perishable seasonal produce, where wholesalers purchase and stock their products in the first period, and then retrieve and sell them in subsequent periods. We first consider the duopoly case and assume that the prices are exogenous and fluctuate. In each period, after the price realization, the wholesalers retrieve some stock from their warehouses to satisfy their demands. One wholesaler's unsatisfied customers can switch to another and be satisfied by its left retrieved products. Any unsold retrieved stock has no salvage value and any unsatisfied demand is lost. The unretrieved stock is carried to the next period at a perishable rate. The wholesalers compete for the substitute demand by determining their own purchase and retrieval quantities. We show the existence and uniqueness of a pure-strategy Nash equilibrium, and that the Nash equilibrium strategy has the simple “sell-down-to” structure. We also consider the general N-person game and show the existence of the Nash equilibrium, and characterize the structure of the equilibrium strategy for the symmetric case. In addition, we consider the case with endogenous prices, and show that the problem reduces to a repeated newsvendor game with price and inventory competition. We derive the conditions under which a unique Nash equilibrium exists and characterize the equilibrium strategy. Finally, we conduct numerical studies to examine the impacts of the model parameters on the equilibrium outcomes and to generate managerial insights.