濒海战斗舰——美国海军新型装备

美国海军称濒海战斗舰（LCS）是一种适于近海复杂水情的快速、高度机动的水面作战平台。海湾战争之后,美军为了加强水面舰艇对地攻击、加强机动性和适应削减军费的形势,濒海战舰应运而生一跃成为当今世界武器的新宠。LCS具有单体和三体两种船体,根据三种作战任务实现模块化重构。尽管发展十多年来LCS在功能设计和火力配置上远远未达到军方的要求,被人指责为＂中看不中用＂,尽管LCS的费效比一直为美国国会所诟病,然而,LCS的建造代表着美国海军作战理念的战略转型。美海军在LCS的快速灵活、续航能力、武器装备方面不断寻求最优组合,以达到其控制亚太和世界海洋权的目的。文章较为系统地介绍美国LCS崛起的原因、发展历史、战术技术性能及近期发展动态。     

基于Arnold变换和图像梯度的水印算法

针对空间域水印嵌入算法鲁棒性不强的问题,利用Arnold变换的周期性,将其应用于水印图像的前期处理,然后再嵌入原始图像的内容(边缘)。使提取的水印图像的错误像素被分散到整个水印图像空间中,提高了人眼视觉系统对水印图像的辨识能力。从试验结果来看,该算法在一定程度上满足了数字水印的鲁棒性要求。     

The Peninsular War guerrilla and its antecedents: humiliation forgotten,disaster prefigured: the guerra fantástica of 1762

ABSTRACT

The brief war that took place between Spain and Portugal in 1762 is one of the least known episodes in the latter’s military history, whereas, thanks to Wellington’s construction of the Lines of Torres Vedras, the French invasion of 1810–11 is right at the other end of the spectrum. Yet the two episodes are closely linked to one another. At the very least, they are uncannily reminiscent in terms of their details – in both cases substantial foreign armies were vanquished through a combination of irregular resistance, scorched-earth tactics and the clever use of field fortifications – and the article therefore argues that Wellington based the plan that defeated the forces of Marshal Massena on the strategy used by the Portuguese half a century earlier.     

电磁发射用分段供电六相圆筒式直线感应电动机数学模型

为研究新型分段供电六相圆筒式直线感应电动机的运行规律，针对其不对称运行的特点，采用磁动势理论推导了气隙中与空间位置无关的脉振磁场的电感矩阵表达式，通过将其引入abc坐标系下对称的电机数学模型，从而构建了描述六相圆筒式直线感应电机不对称的数学模型。在Simulink环境下，采用隐式梯形法构建了该不对称模型的系统仿真模型。最后，对样机进行了仿真分析和实验验证，仿真结果与实验数据吻合良好，验证了模型的正确性。     

分段供电六相圆筒式直线感应电动机数学模型

为研究新型分段供电六相圆筒式直线感应电动机的运行规律,针对其不对称运行的特点,采用磁动势理论推导了气隙中与空间位置无关的脉振磁场的电感矩阵表达式,通过将其引入abc坐标系下对称的电机数学模型,从而构建描述六相圆筒式直线感应电机不对称的数学模型。在Simulink环境下,采用隐式梯形法构建该不对称模型的系统仿真模型。对样机进行仿真分析和实验验证,仿真结果与实验数据吻合良好,验证了模型的正确性。     

基于Multi—Agent仿真模型的非对称作战有效性分析

针对多要素在非对称作战中运用的复杂影响，建立了基于Multi-Agent的仿真模型，对非对称作战的有效性进行了数学解释；给出了Multi-Agent的系统结构，在EINsTein仿真平台中设置了指挥决策Agent、态势感知Agent、通信协作Agent和作战行动Agent，以此模拟作战要素在非对称作战中运用的主要功能，进而演示非对称作战的过程，获得非对称作战的仿真实验数据；仿真模型描述了多要素影响下作战体系的突变现象；通过作战目的的实现和高倍增的作战效果，实证了仿真模型的有效性和可行性。     

Trade credit contract in the presence of retailer investment opportunity

This paper presents a model for designing a trade credit contract between a supplier and a retailer that would coordinate a supply chain in the presence of investment opportunity for the retailer. Specifically, we study a newsvendor model where the supplier offers a trade credit contract to the retailer who, by delaying the payment, can invest the accounts payable amount and earn returns. We find that when the channel partners have symmetric information about the retailer's investment return, a conditionally concessional trade credit (CTC) contract, which includes a wholesale price, an interest‐free period, and a minimum order requirement, can achieve channel coordination. We then extend the model to the information asymmetry setting in which the retailer's investment return is unobservable by the supplier. We show that, although the CTC contract cannot achieve the coordination in this setting, it can effectively improve channel efficiency as well as profitability for individual partners.     

The ‘first’ surge: the repulse of the Easter Invasion in South Vietnam, 1972 – implications for Iraq and Afghanistan

In a military intervention, do surges work? I compare the failed ‘surge’ in Vietnam, the repulse of the Easter Invasion in 1972, as a means of assessing the more ambiguous surges in Iraq and Afghanistan. I identify four features of a surge for this analysis: the military dimensions and strategy of the surging forces, the military capabilities of the host forces, the political vitality and will of the host country, and the political commitment in the domestic politics of the intervener. I find that the last feature is the most critical; and, in all three surges, the American political commitment was lacking.     

基于兰彻斯特型方程的网络攻防行动分析

互联网的高速发展在带来社会发展与文明进步的同时，也让世界对网络更加依赖，随之而来的网络空间军备竞赛、网络犯罪和网络恐怖主义，使网络空间的攻防行动变得愈加频繁，网络空间安全形势愈发严峻。本文利用兰彻斯特型方程建立网络攻防模型来分析网络攻防行动，证明网络攻防行动是非对称的作战手段和新时代的游击战争，并得出对我国网络空间国防力量建设的启示。 