基于分数阶傅立叶变换的ARM检测技术

分数阶傅立叶变换(FRFT)是傅立叶变换的广义形式,对线性调频(LFM)信号具有很好的能量积累作用.针对反辐射导弹(ARM)雷达回波信号的线性调频特性,提出了一种基于FRFT的反辐射导弹检测方法,并根据ARM信号的调频特性将FRFF局域化,缩小了峰值搜索区域,提高了检测效率.仿真实验表明该方法能够在高斯、非高斯分布杂波环境下有效地检测ARM信号.     

机动目标一维距离像RAT法线性化补偿

研究了机动目标宽带线性调频脉冲回波全去斜率信号模型,根据速度和加速度的调频频谱展宽特点,提出了机动目标宽带一维距离像线性化调频回波模型,给出了Radon模糊图转换(RAT)法线性参数估计与运动补偿方法,并进一步分析了测速和测距误差.仿真实验验证了RAT法一维距离像线性化参数估计与补偿,表明该方法很好地解决了运动参数未知情况下机动目标的一维距离像频谱展宽问题.     

大规模代谢网络分解的生物信息学研究

随着大规模分子相互作用数据的不断涌现,生物学网络方面的研究正日益得到重视.代谢网络处于生物体的功能执行阶段,其结构组成方式不仅反映了生物体的功能构成,也直接影响代谢工程中的途径分析和研究.作为代谢网络研究的重要环节,实现网络的合理分解不仅对于基因组范围内分子网络的结构和功能研究具有重要意义,也是代谢工程的途径分析和优化得以顺利进行的前提之一.在回顾代谢网络宏观结构和拓扑特征研究成果的基础上,通过对现有分解方法的深入分析,指出缺乏合理且有针对性的模型评估准则是目前网络分解研究中亟待解决的问题之一.今后的研究趋势在于如何整合更多的信息和发展更先进的分析方法,建立更合理的模型,并进一步拓展网络分解的应用范围.     

超低照度下微光图像增强神经网络损失函数设计分析

超低照度下(环境照度小于2×10~(-3)lux)微光图像具有低信噪比、低对比度等特点,使目标难以辨识,严重影响观察效果。为了提高超低照度下微光图像质量,设计了一种用于微光图像增强的卷积自编码深度神经网络,并针对传统的均方误差损失函数不符合人类视觉感知特性等问题,结合现有的全参考图像质量评价指标,研究了包括感知损失在内的几种损失函数,并提出了一种新的可微分损失函数。实验结果表明,在网络结构不发生改变的情况下,所提损失函数具有更好的性能,在提高微光图像信噪比和对比度的同时,能够有效地增强图像内部细节信息。     

携带诱骗信息的多层网络隐写方法

为了提升网络隐写方法中秘密信息隐蔽传输的安全性,研究了携带诱骗信息的多层网络隐写方法。方法分为两层,高层方法用于携带诱骗信息欺骗检测者,低层方法利用网络协议栈纵向多协议之间的关系编码秘密信息,实现隐蔽通信。实验结果表明,该方法能够在保证隐写带宽的同时,确保了秘密信息传输的安全性。     

Bringing Military Conduct out of the Shadow of Law: Towards a Holistic Understanding of Rules of Engagement

In this article, I outline a holistic approach to the military concept of “Rules of Engagement” (ROE), which complements the legal aspects of ROE with considerations of operational and political requirements for the use of military force. Drawing upon two illustrative cases from the US military experience with the use of ROE, I demonstrate that ROE for any particular military operation should be formulated to balance optimally, if not harmonize fully, the legal, operational and political concerns related to the use of force. In this task, political decision-makers and military practitioners alike are confronted with unavoidable and real-life dilemmas. How these dilemmas are handled has significant implications for how legal requirements concerning accountability and concerns for civilian lives in military combat can be preserved through ROE.     

网络谣言的心理分析与管控

近年来,随着智能移动终端和互联网技术的结合,上网变得十分便利。网民数量激增的同时,网络谣言层出不穷,给社会安全与稳定造成不良影响。文章从心理学角度深入分析助推网络谣言的原因,并基于心理规律提出网络谣言的管控措施。     

The fateful phoenix: the revival of Al-Qa’ida in Iraq

Although the Islamic State in Iraq and al-Sham (ISIS) is seen as a novel manifestation of Islamic extremism, it is in fact the latest, albeit perhaps the most effective, of a long line of revivalist movements in the Islamic and the Arab worlds. Its motivations – hisba and jihad – differ little from its predecessors and its ambitions – to create a state organised in accordance with the precepts of the Islamic caliphate – reflect a long-standing Islamic ambition. It differs, of course, in terms of the sophistication of its political and military strategies, which mirror the contemporary complexities of the world in which it operates, but its objectives recall long-standing Islamic ideals, even if articulated in radically brutal and extremist ways. More importantly, perhaps, ISIS or Da’ish, to give it its Arabic sobriquet, reflects the enormous degree of resentment inside the Middle East at the ways in which Western powers have intervened in regional affairs over recent years, particularly their support for regimes and economic systems there that have betrayed, in the popular imaginary, the essential principles of social justice that lie at the root of Islamic vision of ideal social order. Indeed, in many respects, its analysis of the world in which it operates and of the objectives it seeks differ little in essence from those any other resistance and rejectionist movement, whether religious or sectarian. More specifically, it has been the sectarian conflict that resulted from the reversal of political order in Iraq as a result of the 2003 American-led invasion that has driven the success of the movement in capturing widespread Sunni support. Whether it can manage the complexities of the administration of a state remains open to question.     

Merely ‘Docile Self-Deception’? German Experiences with Nuclear Consultation in NATO

ABSTRACT

Recent nuclear-weapons-related consultation in NATO within the framework of the Defence and Deterrence Posture Review sheds light on historical experiences with nuclear consultation in NATO. In the early years of the Nuclear Planning Group (NPG), which became the main forum for multilateral nuclear consultation in the alliance, developing a nuclear weapons first use doctrine was of particular importance. This process led to the adoption of the Provisional Political Guidelines (PPGs) on the threat to initiate the use of nuclear weapons. With a focus on West Germany as the primary addressee of the NPG, it will be postulated that nuclear consultation functioned and may still be seen as an essential tool to manage the credibility of US extended nuclear deterrence in the framework of NATO.     

基于优先权的分布式网络设备智能轮询策略研究

针对大型网络其地域分布广,监测对象较多,监测周期过长,实时性较差且管理流量负载较大等问题,提出一种分布式网络设备智能轮询策略。在域内,针对轮询周期调整问题,通过构造体现管理者意志的评判矩阵和求解反映数据特征的DFT(离散傅立叶变换)确定轮询优先级和轮询周期取值范围,提出了基于变化率的轮询周期调整算法;在域间,通过触发和查询实现对特殊事件的采集。最后进行了仿真,表明该策略能够在减轻网络负载的同时,准确刻画网络的状态。