Models of sensor operations for border surveillance

This article is motivated by the diverse array of border threats, ranging from terrorists to arms dealers and human traffickers. We consider a moving sensor that patrols a certain section of a border with the objective to detect infiltrators who attempt to penetrate that section. Infiltrators arrive according to a Poisson process along the border with a specified distribution of arrival location, and disappear a random amount of time after their arrival. The measures of effectiveness are the target (infiltrator) detection rate and the time elapsed from target arrival to target detection. We study two types of sensor trajectories that have constant endpoints, are periodic, and maintain constant speed: (1) a sensor that jumps instantaneously from the endpoint back to the starting‐point, and (2) a sensor that moves continuously back and forth. The controlled parameters (decision variables) are the starting and end points of the patrolled sector and the velocity of the sensor. General properties of these trajectories are investigated. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

一类新的优美树

Rosa 等人于1966年提出了著名的优美树猜想,即任何树都是优美图.该猜想至今没有得到证明或否定,仅有一些特殊树类被证明是优美图.通过构造路Pn=v0v1…vm的平衡标号f使f(v0)=k,其中k为任意不大于n的非负整数,且4k≠n,3n,进而给出一种新的优美树的构造方法,使已知的优美树大大增加.     

运载器牵制释放结构动力响应数值模拟方法研究

将运载器牵制释放垂直发射的过程依次分为静态、牵制、释放三个阶段.利用MSC.Patran/Nastran的场功能和分组分析功能,将前一个阶段的计算结果场向后一个阶段的初始条件场传递,提出了一种分析运载器牵制释放全过程结构动力响应的分阶段计算新方法.解决了牵制释放过程中由于出现运载器-发射台分离面给结构动力响应计算带来的困难.采用该方法计算了几个运载器牵制释放的算例,分析了牵制阶段牵制力的变化、释放阶段运载器结构动力响应的特点、不同释放时间对结构动力响应的影响.算例表明:该方法实施简便、精度较高,还可拓展用于不同时刻释放、释放不同步、施加缓释力等条件下运载器结构动力响应的分析,为牵制释放系统的研制提供参考.     

全局仿射变换条件下图像不变量提取新方法

从仿射几何理论出发,提出了一种全局仿射变换条件下图像特征不变量构造的新方法.利用仿射区域划分获取一组扩展质心集合作为图像特征点集;求解特征点集的凸包,根据扩展质心的性质将凸包顶点均匀组合成若干特征区域;利用仿射几何性质构造了有效的仿射不变量.实验对该方法进行了全面的比较分析,以验证所构造的不变量更具稳定性和高时效性.     

Reluctant guerrillas in early nineteenth century China: the White Lotus insurgents and their suppressors

ABSTRACT

At the turn of the nineteenth century, China’s Qing dynasty (1644–1912) was hit by a sectarian rebellion. Commonly considered a breakpoint marking the end of the dynasty’s golden age spanning most of the eighteenth century, the war to suppress the rebels, referred to as the White Lotus War (1796–1804) in this article (‘White Lotus’ was the umbrella name used by both the authorities and some sectarians for their teaching), exposed many structural drawbacks of the Qing political and military systems and depleted the dynasty’s financial resources, which had never been recovered. Reluctant in embracing guerrilla warfare in the beginning, the insurgents quickly turned themselves into master guerrillas. Shuttling in two massive mountain ranges in central China, they managed to prolong their rebellion and fought some successful battles against their suppressors. Superior in manpower, weaponry, and logistical support, the government forces had to adapt to guerrilla warfare, albeit passively and ineptly. This article gives a brief introduction to this little-known episode of guerrilla war at the turn of the nineteenth century in Qing China, expounds the strengths and weaknesses of both sides, and sheds light on the roots of the war’s long duration and the grim consequences to the Qing state.     

网络舆论智能引导仿真推演模型与系统构建

传统马甲机械发帖的网络舆论引导方式存在智能水平不高、效果不佳的缺点。人工智能的快速发展为网络舆论智能引导奠定了坚实的理论与技术基础。本文突破新闻传播学的思维定式，利用智能体、系统建模与仿真等理论技术，研究网络舆论智能引导，提出“态势感知-仿真推演-舆论引导”的网络舆论智能引导思路，构建网络舆论智能引导仿真推演模型，明确仿真推演工具，进而构建网络舆论智能引导系统，在仿真推演的基础上实施网络舆论引导，从而颠覆传统马甲的机械式发帖引导方式，破解难以在真实网络环境中直接尝试各种引导策略的困局。本文的研究成果对于丰富网络舆论斗争理论，占领网络舆论制高点，具有重要理论意义和参考价值。