一种抗比例变化的影像图与矢量数据匹配方法

由于矢量图匹配中涉及比例变化的匹配算法较少,提出了一种抗小比例变化的影像图与矢量图匹配方法。该方法先对遥感影像进行特征提取,然后与GIS矢量数据进行由局部到整体的动态规划匹配。具体过程为先进行点匹配,寻求坐标变换,再进行线匹配,求得线间Hausdorff距离最小为最优匹配。仿真实例表明该方法能够准确地匹配,并抗比例变化,可行性高。     

NATO AS AN EXTERNAL DRIVER OF INSTITUTIONAL CHANGE IN POST‐COMMUNIST COUNTRIES

So far, economic analyses of NATO enlargement have been restricted to aspects of regional security while political analyses focused on indirect peace‐building effects on democracy in the first place. Our panel regressions for 25 post‐communist countries for the period from 1996 to 2008 reveal that direct incentives provided by NATO pre‐accession are important for broad‐based institutional development. Results are even more robust than for variables measuring EU pre‐accession or NATO membership effects. This supports the argument that NATO can act as a transformative power and should strengthen its political agenda.     

新疆生产建设兵团教师教育的变迁与发展

新疆生产建设兵团成立以来,不仅担负着国家赋予的屯垦戍边职责,也担负着沉重的文化教育使命。回顾兵团教师教育30年的发展历程,兵团教师教育先后历经了初创期、成长期和发展期三个阶段。当前,兵团教师教育在办学指导思想,师资队伍建设、课程设置、人才培养模式上存在一系列问题。根据当前高等教育的发展趋势,今后兵团教师教育应坚持“师范性”与“学术性”并重的原则,走内涵发展之路,加强特色学科和专业建设,优化人才优化培养模式,改革教师教育课程体系,打造教师教育专业团队,推动兵团教师教育事业更好更快地发展。     

基于线特征的多时相遥感图像变化检测

多时相遥感图像中利用线特征可以感知道路等线形地物的变化。论文提出一种新的基于边缘特征描述的线特征变化检测算法,首先根据边缘的梯度信息得到变化边缘,并对变化边缘进行编组,形成变化边缘的直线支撑区域,然后通过最小二乘拟合方法从直线支撑区域中提取出变化直线。提出的线特征变化检测算法把边缘的相位和幅度信息作为变化检测的判定依据,从而避免了线的匹配与比较工作,降低了变化检测的算法复杂度,具有很强的实用性。将提出的方法用于多时相遥感图像变化检测,实验结果显示该方法的有效性。     

基于天线阵方位变化的相位双差GNSS欺骗干扰检测算法研究*

GNSS欺骗干扰通常由单个天线发射,各个欺骗干扰信号到达接收机的角度相同,采用阵列天线接收时欺骗信号达到不同阵元的相位差包含了其角度信息,故可利用信号载波相位差进行欺骗干扰检测。相位双差检测算法通过比较不同卫星信号到达天线阵两阵元的相位差实现欺骗干扰的判别,但对于二元天线阵,其载波相位双差存在角度模糊,导致虚警概率较高,限制了算法的应用。针对这一问题,本文提出了基于天线阵方位变化的欺骗干扰检测算法,通过二元天线阵在不同方位估计信号的载波相位双差,进行多次判决,有效消除了角度模糊,降低检测的虚警概率,实现二元天线的载波相位双差检测。建立了仿真模型,并通过仿真计算分析验证了该方法的有效性。     

星载干涉仪无源定位新方法及其误差分析

针对传统单星二维干涉仪测向定位存在的设备量大、易受通道间幅度/相位不一致性影响等缺点,提出了在单颗自旋卫星上只安装两个接收通道构成一维干涉仪,测量相位差变化率的无源定位新方法,采用了基于粒子群优化(PSO)的定位算法,分析了干涉仪转速以及旋转平面对定位性能的影响.结果表明,增大干涉仪转速有利于提高定位精度,为了使星下点周围各个方向上都有较好的定位精度,干涉仪旋转平面应与初始观测时刻卫星位置矢量垂直,PS0算法的定位精度能够接近定位误差的克拉美罗下限(CRLB).     

低熔点石蜡微胶囊的中试及热性能

为寻找能适应环境温度的相变材料,选择低熔点石蜡作为芯材,制备微胶囊并进行中试生产。对同一样品进行了26次DSC热循环测试和TGA热失重测试,结果表明：中试产品的相变温度始终保持在25~60℃,相变极值和相变热焓均未发生明显变化,分别为42℃和72 J/g;产品能耐受150℃以内的高温而不分解,且在相变温度范围内基本无失重。证明低熔点石蜡微胶囊能在环境温度内发挥调节作用,同时具备较长的热循环寿命和较好的热稳定性,是一种具备良好应用前景的相变材料。     

From one exceptionalism to another: France’s strategic relations with the United States and the United Kingdom in the post-Cold War era

ABSTRACT

The failed expedition of Suez in 1956 and France’s subsequent strategic ‘divorce’ from the United Kingdom and the United States lies at the heart of a policy paradigm that has dictated France’s defence posture from de Gaulle’s presidency to the end of the Cold War. Some crucial features of the Gaullist posture remain today enduring references for French presidents in the definition of France’s exceptionalism. While it is so, there have been significant changes since the 1990s when it comes to France’s strategic relations with the United States and the United Kingdom. This article demonstrates the extent and mechanisms of this rapprochement by analysing it through three dimensions of policy change: modes of action, institutional commitments and discourses. The article demonstrates the dimensions’ mutually reinforcing effects and argues that France’s exceptional posture has de facto been reversed.     

‘Innovate or die’: Organizational culture and the origins of maneuver warfare in the United States Marine Corps

The purpose of this article is twofold. First, this article contributes to the understanding of the origins of maneuver warfare as the capstone doctrine of the Marine Corps. It does so by identifying a second source that fostered change in the Marine Corps – one in addition to disquiet about the conduct of the war in Vietnam – which stemmed from the challenges posed by the United States' post-Vietnam strategic and military reorientation. And second, this article examines the influence of organizational culture, or identity, on innovation in the Marine Corps. A critical strand in the growing literature on military innovation focuses on organizational culture and how it influences the behavior and responses of particular military organizations. This article contributes to this literature by analyzing the influence of the organizational culture of the Marine Corps in shaping what was deemed an appropriate response to the challenges it confronted in the 1970s.