离散作战模型的连续化兰切斯特模型研究

通过兰切斯特方程的分析,定义了作战力量变换系数概念,推导出作战力量变换系数的兰切斯特方程,得到了衡量交战双方作战力量等效值,而作战力量变换系数的兰切斯特方程正是适用于离散型作战的兰切斯特作战模型,使具有深刻影响力的兰切斯特方程适用范围扩大到了交战双方离散数量型的作战领域,从而赋予兰切斯特方程新的生命,为复杂的格斗作战分析提供了新的工具。     

磁致伸缩作动器的位置跟踪补偿控制

为提高磁致伸缩作动器控制精度,以 Jiles-Atherton 磁滞和动力学模型为基础,通过优化偏执磁场和预紧力来提高作动器线性度,并基于前馈控制、PID 反馈控制及柔性神经网络理论,提出了前馈补偿 PID 及柔性神经网络前馈补偿 PID 控制策略。同时,以偏置正弦和阶跃为指令信号,研究作动器的位置跟踪和补偿控制。仿真表明：相比常规 PID 控制和前馈补偿 PID 控制,柔性神经网络前馈补偿 PID 控制具有更好的位置跟踪效果和抗干扰能力,具有无振荡、无超调、响应速度快的特点。     

变距离静电电位检测研究

针对现有非接触式静电检测装置存在检测距离近且距离固定等问题,提出了对电位测量进行距离补偿的变距离静电电位检测方案。首先,从电位测量的基本原理出发,分析了距离测量误差与电位测量误差的关系,验证了精确测距的重要性,即要满足电位测量相对误差σV≤±10%,所选测距方式的距离测量相对误差-4.65%≤σd0≤5.41%的技术指标。然后,通过实验研究了检测距离与感应电位的关系,验证了0.5 m内对静电电位变距离测量的可行性,得到了对电位测量进行距离补偿的公式雏形Vs(V a,d)=Va(a+bd)c。依据此公式雏形以及大量的重复实验,可以得到公式中的各项参数值,编入单片机可实现对静电电位的变距离检测。     

任职教育背景下推进教育教学转型的思考

推进院校教育教学转型是新形势下新的课题,也是一项复杂的系统工程。到底“怎么转”、“转什么”,是关系院校建设发展一个重大而现实的课题。从确立转型理念、把握转型规律、聚合转型力量三个方面进行了探析和阐述,力求为推进转型发展提供借鉴与参考。     

一种SAR图像特征提取和目标分类的新方法

提出了一种利用二维离散小波变换与核主成分分析结合对SAR图像进行特征提取的新方法.该方法对SAR图像进行三层小波分解后提取低频子带图像的核主成分分量作为目标的分类特征,利用支持向量机完成目标分类.采用MSTAR实测SAR目标数据集进行特征提取和分类实验,实验结果表明:该方法可以有效提高目标的正确识别率.     

Book review

La Conversion économique du secteur militaire, J. FONTANEL, Economica, Paris, 1994, pp. 112. Paperback. ISBN 2–7178–2650–5.     

Modelling international conflict under conditions of state level economic and political uncertainty

Formal models of international conflict have tended to concentrate on change across the security dimension, assuming that the state level economic and political dimensions are constant. However, the conclusion of the Cold War suggests that over the long run these dimensions are not constant; indeed, the development of economic power, state level limits on defence expenditures, structural impediments to economic change, and several other ‘constants’ clearly do have an endogenous role in international conflict. This paper suggests one strategy for their inclusion as a causal factor in conflict modelling.     

FOOD AID

Abstract

This paper seeks to critically appraise Africa's position within the United Nations Security Council from the inception of the UN in 1945 until the end of 2010, spanning the entire history of the world body. A few factors make such an appraisal a useful exercise. These include the ongoing debates about the reform of the Council in particular and the UN as a whole, and the growing interest that many African students and observers of and actors in international relations seem to have developed in recent years in the working of the world body. In this appraisal, emphasis will be placed on the origin and rationale behind the establishment of the Security Council as well as the use of the veto power by its permanent members, with a special reference to Africa.     

Does Health Spending Crowd out Defense in the United States? Evidence from Wavelet Multiresolution Analysis

Abstract

This study investigates the association between defense and health spending using multi-resolution analysis incorporating the structural change model. Our empirical results suggested that a negative correlation between defense and health spending persists over the entire period of 1941–2013 in the very long-run (over 16 years cycle), but there is a change in correlation between defense and health spending in the short-run (2–4 years cycle), medium-run (4–8 years cycle), and long-run (8–16 years cycle) during the same period. In particular, there appears to have been a trade-off relationship between defense and health spending during the ex-Korean War period, but there was a complementary relationship between defense and health spending during the post-Korean War period. The crowding-out effect of health spending on defense spending during the period when the Affordable Care Act was put into effect relies on the strength of the positive correlation in the long-run (8–16 years cycle) and negative correlation in the short-run (2–4 years cycle) and very long-run (over 16 years cycle).     

EXTRAORDINARY VISITS

North Korea has the bomb but not much of a nuclear arsenal. For fifty years, it pursued the plutonium path to the bomb in parallel with its pursuit of nuclear electricity. My visits to North Korea's Yongbyon nuclear complex provided a window to its plutonium capabilities. After having made six visits to North Korea, Pyongyang surprised me during my seventh visit last November by showing me a small, modern uranium enrichment plant, which I was told was needed for its new indigenous light water reactor program. However, the same capabilities can be used to produce highly enriched uranium bomb fuel. Following a pattern of having made poor risk-management decisions during much of the past twenty years of diplomacy dealing with the North Korean nuclear threat, Washington remains in a standoff with Pyongyang.