高精度有限体积格式在三维曲线坐标系下的应用

为了构造在光滑区具有较高分辨率并且可以无振荡捕捉激波的高精度有限体积格式,同时降低格式在模板选择上遇到的困难,基于逐维重构方法,发展了结构网格下的高精度有限体积格式,并将这一格式推广到三维曲线坐标系下,从而可以适应相对复杂外形下的计算。为充分验证格式的有效性,选取一系列典型算例进行计算:在等熵涡输运和二维喷管流动中验证了格式的精度可以达到设计精度;在双马赫反射问题中格式也表现出良好的捕捉激波的能力。数值计算表明,上述格式在曲线网格上具有较高的数值精度和鲁棒的激波捕捉能力,适用于流体力学方程的计算。     

红外成像导引头抗干扰性能评估方法

给出了一种对地面复杂干扰环境的红外成像导引头抗干扰性能评估方法,分析了红外成像导引头所面临的干扰因素,结合实际战场情况对干扰环境的等级进行了划分,并详细设计了红外成像导引头抗干扰性能仿真测试方案。采用半实物仿真方法得到红外成像导引头在不同干扰环境下的实验数据,运用bayes估计的方法建立红外成像导引头抗干扰概率计算模型。结合某实物红外成像导引头开展抗干扰性能半实物仿真测试,实验结果验证了该方法的合理性和有效性。     

A mean cost approximation for transportation problems with stochastic demand

Among the many tools of the operations researcher is the transportation algorithm which has been used to solve a variety of problems ranging from shipping plans to plant location. An important variation of the basic transportation problem is the transportation problem with stochastic demand or stochastic supply. This paper presents a simple approximation technique which may be used as a starting solution for algorithms that determine exact solutions. The paper indicates that the approximation technique offered here is superior to a starting solution obtained by substituting expected demand for the random variables.     

军用雷达成本波动的源头探索与关键控制

根据军用雷达成本涉及的各个方面,建立雷达成本波动评价指标体系,运用主成分分析法确定其重要影响因子及权重,构造具有望小特性的评价函数可用于竞标决策选优,为军用雷达成本控制提供即时管理。     

基于ANN的高炮火力单元射击有利度评估

采用ANN(人工神经网络)方法对高炮火力单元射击有利度进行评估是一种新的尝试。在对各影响因素进行分析与量化处理的基础上,建立了基于ANN的高炮火力单元射击有利度评估网络模型,并提供了网络的解算方法。通过某型高炮对不同目标射击的已知有利度评估值对网络进行的训练,确定了网络的各权值,并使学习误差达到了预先规定的标准,实现了对该型高炮对空射击有利度的评估。     

粗糙模糊C均值融合聚类

提出一种新的粗糙模糊C均值融合聚类算法,该算法通过粗糙集上、下近似的引入改变了模糊C均值算法中隶属度函数的分布情况,修正了类心的更新公式和模糊隶属度计算公式,降低了计算复杂度,在改变模糊隶属度分布的同时,通过使得每一类总的隶属度变化保持最小,进一步提出了边界调节参数的自适应选择算法,实验结果表明,粗糙模糊C均值融合算法...     

双线性表面建模电大目标RCS仿真

目标的电磁散射特性研究对于实现雷达探测、识别、跟踪目标起着至关重要的作用,而雷达散射截面(Radar Cross Section,RCS)又是体现目标电磁散射特性的一个重要方面.参数曲面能精确模拟目标的几何外形,提高计算精度.采用参数曲面——双线性表面建模,运用物理光学(Physical Optics,PO)法计算电大...     

Grammar but No Logic: Technique is Not Enough – A Response to Nagl and Burton

Abstract

In issue 33/1 of The Journal of Strategic Studies, John Nagl and Brian Burton were provided with the opportunity to respond to the observations we made in our article, ‘Whose Hearts and Whose Minds? The Curious Case of Global Counter-Insurgency’, which appeared in the same issue. Nagl and Burton's reply, however, did not overtly address the points raised in our article, but instead offered a re-statement of the precepts of classical counter-insurgency (COIN). While we certainly recognise the value of counter-insurgency methods in conflicts such as those in Iraq and Afghanistan, Nagl and Burton's reply overlooks our original concerns about the limited utility of neo-counter-insurgency thinking outside these environments and the dangerous political implications it contains. They further ignore our core contention that a narrow preoccupation with theatre-specific technique has profound limitations when offered as a universal panacea to address complex transnational threats.     

关于译者对意识形态控制的探讨——《论语心得》翻译的案例研究

Martin J.R.的评价理论,与品鉴译者的意识形态控制的联系十分紧密。通过对《论语心得》翻译的举例分析,揭示了Esther Tyldesley总结的关于意识形态控制的重点和理论的适用性。