一种基于相位校正的InISAR图像配准新方法

针对InlSAR三维成像中的图像配准问题进行研究,从理论上推导了同一基线上两干涉天线之间图像失配准的原因,并定量分析了图像失配准量对后续干涉处理的影响.研究表明,初始时刻同一基线上两干涉天线间的波程差引起两幅ISAR图像距离方向的亚像素级失配,而成像积累时间内两干涉天线波程差的变化量则引起两幅ISAR图像多普勒方向的像...     

基于作战能力图的兵力部署评估仿真

运用电子地图的发展成果和技术,通过将联合作战兵力转化为具有一定属性值的作战能力像素点,以点阵图形式来显示和研究兵力部署,实现对联合作战兵力部署的评估,为定量化研究联合作战兵力运用提供一种辅助决策的新方法.     

基于LS-SVM的飞机保障性预测评估建模

针对飞机保障性预测评估建模难的问题,基于统计学习理论,采用LS-SVM方法,建立了飞机保障性的预测模型。仿真试验结果表明,LS-SVM具有很高的建模精度和较强的泛化能力,从而验证了该方法的有效性和先进性。     

Polaris,East of Suez: British Plans for a Nuclear Force in the Indo-Pacific, 1964–1968

This article investigates the little-known plans formulated by Harold Wilson's Labour government to deploy Polaris submarines in the Indo-Pacific region. The scheme was first proposed in 1965 as a response to several problems faced by British policy-makers, including China's acquisition of a nuclear capability, Britain's wish to maintain a meaningful position ‘East of Suez’ at reduced cost, and German pressure for equal treatment within NATO on nuclear matters. Despite extensive high-level discussion, the plans were finally abandoned in mid-1968, as Labour moved more decisively to forsake the world role.     

China's Global Equity Oil Investments: Economic and Geopolitical Influences

In this article, we construct and analyze an original database of overseas Chinese equity oil investments (EOI) in order to assess the relative importance of economic and geopolitical factors in determining the type of countries that are most likely to receive those investments. We find that China's national oil companies (NOCs) choose to make considerable investments in certain oil rich countries while ignoring others. We develop and examine ‘economic opportunity’ and ‘geopolitical relevance’ explanations of Chinese EOI. The economic explanation assumes that Chinese oil companies operate autonomously despite the fact that they are state owned, and that they seek international experience in countries offering less competition but more risk. The geopolitical explanation suggests that Chinese equity oil investments are developed and coordinated by the central government as part of a geopolitical strategy that is designed to bypass the so-called ‘Malacca Dilemma’ and deepen security ties with oil-rich states through the conduct of oil diplomacy. We argue that Chinese EOI tends to reflect both corporate interests and government priorities, and that it generates more liabilities rather than benefits for China.     

The Zimbabwe people’s revolutionary army military operations in Makonde district and the attack on Salisbury’s fuel storage tanks, 1965-1979

ABSTRACT

This article analyses the Zimbabwe People’s Revolutionary Army operations in Mashonaland West province with particular reference to Makonde District during the country’s war of liberation. Despite the growing literature on ZAPU and ZPRA in Zimbabwe’s war of liberation there is little that has been written concerning the operations of ZPRA guerrillas in Mashonaland provinces. Guided by evidence drawn from secondary and primary sources the article further asserts that ZPRA adopted a four pronged strategy in Makonde District. This strategy in part was hinged on the politicization of the population on the one hand and annihilation of the enemy forces, attrition and manoeuvre warfare on the other. Again, the article argues that ZPRA guerrillas attempted to capture Salisbury (Harare) in order to conquer the Rhodesian Security Forces’ centre of gravity. It was hoped that the capture of the capital city would Makoni District was of strategic significance to the conduct of ZPRA operations and arguably hastened Ian Smith’s decision to attend the Lancaster House Conference negotiations that led to the independence of Zimbabwe in 1980.     

Past failures and future problems: the psychology of irregular war

Personal cognitive processes inform how individuals understand their environment. Cultural variation, fundamental attribution error, causal attribution, and durability bias create obstacles to Western understanding of irregular war and have created a significant institutional bias in how the US military perceives its enemies- a perception only somewhat softened after a decade of irregular war. United Special Operations Command (USSOCOM) is in a better position to overcome these problems through persistent engagement. In the event of major conflict, environmentally sensitized military planners will be better able to achieve military and policy objectives.     

基于云分类器的液体火箭发动机故障诊断方法

本文首先将液体火箭发动机故障诊断问题转化为故障特征的模式分类问题,然后针对当前模式分类方法难以处理不确定性信息、属性特征空间的划分过硬等缺陷,结合云模型和云变换研究,提出了一种基于云分类器的液体火箭发动机起动过程故障诊断方法。历次试车数据的验证结果表明,该方法能够及时准确识别发动机起动工作过程中的故障模式。     

封装对螺旋线圈发射器互感梯度的影响

互感梯度是决定线圈炮加速力的主要因素。本文以螺旋线圈炮为例,建立了计算互感梯度的二维有限元模型,对四种不同属性的封装材料和封装尺寸对互感梯度的影响做出了分析和比较,并给出了不同的封装材料及尺寸下封装的电流密度和磁场分布图。分析表明,互感梯度受到封装材料电导率和磁导率的双重制约。电导率决定了封装中感应涡流的大小;磁导率决定了对磁场的加强程度。减小封装与线圈的间距,导磁材料的磁场加强效果更好,而导电材料的涡流效应也更明显;增加封装的厚度,导磁材料可以更好地增强磁场,但导电材料由于电阻更小涡流效应更明显。为了实现互感梯度的最大化,可以在减小封装与驱动线圈间距并增加封装厚度的情况下使用高磁导率的硅钢片制作封装,硅钢片的厚度应该尽量小从而削弱涡流效应。     

French war plans, 1914: The ‘Balance of Power Paradox’

Historians have noted that both German and French war preparation in 1914 fell victim to the inadequacies of traditional threat-based planning: vulnerability to ‘threat deception’ which caused each to underestimate or mischaracterize the threat; a tendency to ‘mirror-image’ by fitting intelligence into preconceived notions of how the enemy was expected to behave; and ‘group think’ that discouraged a serious consideration of alternative scenarios. This article applies the ‘Balance of Power Paradox’ to explain why, at the dawn of the twentieth century, war planning in both Germany and France was driven by an acute sense of weakness which encouraged each side to fashion highly ‘risk acceptant’ strategies. In particular, he examines why and how French commander-in-chief General Joseph Joffre evolved and rationalized his audacious, and disastrous, Plan XVII to leverage French weaknesses and prevent the stronger German Army from bringing the full weight of its military strength to bear against France. The potential implication of this historical vignette is that leaders, and by extension military planners, of both strong and weak states focus on the constraints faced by their opponents, and assume that they can avoid the limitations of their position, while their opponent cannot.