基于小生境遗传算法的相控阵雷达任务调度

针对密集目标环境下相控阵雷达任务调度问题,分析了相控阵雷达工作任务特点、调度流程以及资源约束,建立了资源约束条件下的相控阵雷达调度模型。研究了传统遗传算法在相控阵雷达任务调度中收敛速度慢和早熟问题,提出了基于共享机制的自适应小生境技术的改进方法。仿真结果表明,基于小生境遗传算法的相控阵雷达任务调度方法能够有效地提高任务调度成功率,降低截止期错失率。     

带时间窗的相控阵雷达实时任务调度方法

为了解决传统相控阵雷达任务调度中采用基于工作方式优先级的方法而存在忽略任务时间紧迫性和重要性的问题,提出了一种基于任务自身工作方式优先级、截止期和空闲时间3个特征参数的相控阵雷达任务调度方法,通过调整参数的权重来适应调度器不同的负载情况,并采用时间窗处理发生冲突的任务请求,确保更多的高优先级任务在调度间隔内被调度。仿真结果表明,所提出的方法能够有效提高任务的调度成功率,明显改善调度器性能。     

基于最小时间窗的多功能雷达调度算法研究

雷达、电子战、通信等多功能电子系统一体化是雷达的发展方向之一,针对多功能雷达的资源管理与调度,基于孔径分割建立了多功能雷达系统的任务模型,根据任务作用距离确定了任务事件对孔径资源的占用率,并在此基础上给出了一种基于最小时间窗调度间隔的任务调度算法来解决多功能雷达的任务调度问题,通过仿真验证,证明该算法具有一定的有效性.     

相控阵雷达协同探测任务调度研究北大核心

针对相控阵雷达协同探测资源调度问题,提出了一种协同探测任务调度算法。首先介绍了相控阵雷达协同探测相关内容;接着给出了协同探测调度模型。针对多节点协同探测,提出一种优化模型,权衡时间偏移量和时间利用率2个因素,在不显著增大时间偏移量的前提下,提高时间利用率,提升探测性能。最后通过仿真验证了算法的有效性。     

相控阵雷达协同探测任务调度研究

针对相控阵雷达协同探测资源调度问题,提出了一种协同探测任务调度算法。首先介绍了相控阵雷达协同探测相关内容;接着给出了协同探测调度模型。针对多节点协同探测,提出一种优化模型,权衡时间偏移量和时间利用率2个因素,在不显著增大时间偏移量的前提下,提高时间利用率,提升探测性能。最后通过仿真验证了算法的有效性。     

基于目标威胁度的相控阵雷达自适应调度方法

对时间资源的合理安排是相控阵雷达发挥自身优势的关键。将目标威胁度引入调度算法中,与工作方式和任务截止期共同进行综合优先级规划。通过构建目标威胁度的量化模型,使雷达在调度跟踪任务时依目标威胁度大小分配时间。提出了修正价值率和执行威胁率的概念,完善了性能评估指标。通过仿真,全面评价了新算法性能,验证了引入目标威胁度的合理性。结果表明,新算法可以有效提升相控阵雷达对高威胁度目标的处理能力。     

一种基于反馈式结构的异步航迹融合算法

在实际的雷达网数据融合系统中,多数情况下各部雷达的采样时刻不同步,并且采样周期不一致,比如引导雷达和警戒雷达。本文提出了一种基于反馈式结构的异步航迹融合算法,即便在局部节点采样周期相差较大的情况下,仍能充分利用局部节点的信息。经仿真实验验证了该算法的优越性。     

改进遗传算法的相控阵雷达自适应调度算法及仿真

多功能相控阵雷达因其阵列天线的波束捷变能力,可执行对多个目标交替搜索、验证、跟踪等任务,而如何在时间约束下分配任务,对雷达性能有着决定性的影响。使用一种有效的调度算法能够使雷达资源合理分配,能够让雷达整体性能优化。在分析自适应调度算法的设计原则基础上,给出了具体的性能评估指标。针对多功能相控阵雷达,改进了传统的遗传算法作为调度算法。算法能够在雷达调度间隔约束下,选择综合效能最好的方案安排一个调度间隔内的雷达事件序列,并通过仿真结果验证了算法的有效性。     

多核系统中基于动态松弛时间回收的节能实时调度算法

许多嵌入式实时任务的实际执行时间往往小于最坏情况执行时间,因此可以产生大量的动态松弛时间.针对时限等于周期的偶发任务集,提出一种基于动态松弛时间回收的多核系统节能实时调度算法LRE-DVFS-ALL.该算法基于最优在线调度算法LRE-TL,利用TL面内节能实时调度思想,在每个TL面的提前完成时刻实现动态松弛时间回收,降...     

综合优先级的被动雷达任务自适应调度算法

综合考虑影响威胁度的5个参数,给出辐射源威胁度评估准则与方法。将辐射源威胁度参数融入被动雷达任务优先级的设计中,提出一种综合优先级算法(HTHPEDF),根据辐射源威胁度动态地调整任务优先级。运用该综合优先级算法实现任务自适应调度,设计调度收益与调度代价的评价函数。通过仿真验证了算法的有效性,该算法以较低的调度代价获得较高的调度收益,可有效提升任务综合调度能力。     

Helping hands: civil–military cooperation and Italy's military operation abroad

In the Post-Bipolar Era the growing complexity of the military operations requires a new approach for the resolution of international crises. Since the end of the Cold War, peace support operations (PSO) have become the mainstay and principal occupation of most Western armies. At the same time, Italy has been one of the most important actors in such an area. The article focuses on the cooperation between military and civil components (a process called CIMIC) as a key variable in the Italian PSOs. We will analyse in detail the main lessons learned from past military interventions as well as the general context in which new tendencies are taking place. The maintaining of a minimum security frame becomes essential to fulfil activities ‘collateral’ to the mission: reconstructing services and infrastructure, food distribution, water and medication, law and order, de-mining, training of local forces, and supporting local institutions. These are the main tasks to obtain thrust and support from the population.     

Terrorism,insurgency, kidnapping,and security in Africa's energy sector

Energy continues to serve as the bedrock of modern economies and the main driver of modern society. For Africa, the production and supply of energy resources such as crude oil, natural gas, uranium, coal, biomass, biofuels and other renewables are an important source of employment, rents, taxes, royalties and profits. This sector brings in several tens of billions of dollars of revenue annually. The production and delivery of such resources, however, depend on critical infrastructures such as pipelines, refineries, processing plants, terminals, rigs, electrical energy pylons, substations, pump stations, vessels, and tankers. These infrastructures have been attacked by terrorists, insurgents, vandals and saboteurs, all of whom see them as targets against which to register their grievances and extract concessions from the state. This paper is a chronological account of some of the documented incidents of terrorism, insurgency, kidnapping, destruction, sabotage, and human casualties suffered in the oil and gas sectors in Africa between 1999 and 2012. It is based on data extracted from the databases of the RAND Database of World Terrorism Incidents and the University of Maryland's Global Terrorism Database (GTD).     

A1 Qaeda and the radical Islamic challenge to western strategy

The September 11 global crisis prompted by the attacks on the World Trade Center and the Pentagon raises major questions concerning the nature and trajectory of terrorism in the post-Cold War global order. Hitherto, terrorism has been largely debated by analysts at the level of nation states. Terrorist and insurgent movements have also been largely anchored in nationalist and ethnic power bases even when they have sought to mobilise a transnational ideological appeal on religious or class grounds. There have been a few exceptions to this pattern such as the alliance between the German Baader-Meinhof group and the Japanese Red Army Faction, but even such international alliances as this did not, until at least the 1980s, presage anything like a global terrorist network necessitating a global strategic response. This study examines terrorism and global strategic responses.     

Tacit support for terrorism: The rapprochement between the USSR and Palestinian guerrilla organizations following the 1967 war

This article demonstrates the inconsistent and wavering Soviet attitude towards national liberation movements in general and the Palestinian organizations in particular. Until the late 1960s, the Soviets viewed these organizations with suspicion, hesitating to engage in political dialogue with them. However, in the 1970s, political and military events in the region, as well as modifications in the Kremlin's Cold War strategies, led to a general shift towards the Middle East in Soviet foreign policy. Soviet leaders showed increased willingness to provide certain Palestinian organizations with arms with which to conduct terrorist activities against Israeli, pro-Israeli, Jewish and Western targets. The article explores the complex relations between Palestinian organizations and the USSR in the field of international terror. The study also exposes and analyzes the nature and content of Soviet–Palestinian arms dialogues and transactions. It provides clear evidence that Soviet policymakers and other luminaries were fully informed of, and sometimes directly involved in, these transactions and dialogues at the highest levels.     

Helping hands: external support for the KNU insurgency in Burma

This article analyses to what extent the Burmese KNU insurgency made use of external support from states, refugees, and diasporas. Based on extensive fieldwork it is concluded that support from neighbouring states and refugees has for years kept the Karen rebellion alive. Western countries perceived forms of resistance to the illegitimate Burmese regime as just and have therefore played a crucial role in the continuation of conflict in Karen State. It is important that policymakers and donors as well as executing organizations continue to reflect critically on the way they exercise their work.     

基于GTST-DMLD-ESD的装备RMS建模仿真

装备的RMS是装备的重要设计参数,是影响战备完好和保障能力的关键因素.引入GTST-DMLD作为主要建模工具,建立起装备系统的RMS描述模型,以ESD为补充和扩展,对维修过程进行建模.并以GTST-DMLD-ESD模型作为装备RMS仿真的核心,对装备RMS仿真模型的总体框架进行了研究,并对各模块进行了较为详细的探讨.     

Cyber sheiks and grassroots jihadis: the war in Syria and the devolution of the Bosnian Salafi communities

ABSTRACT

What was the scope of the Bosnian jihadi participation in the war in Syria? Did the Bosnian volunteers tend to join one particular faction? Why did the Bosnian youngsters decide to join the holy war in the Levant? Was this an organized and hierarchical process or was this a grassroots movement? Last, were all the Salafis in Bosnia supportive of this dynamic or did this process cause internal frictions? These are some of the questions that this research will try to answer.     

Country survey XVI the defence sector in the economy of a declining superpower: Soviet Union and Russia, 1965-2001

The Soviet Union was able to develop a large military-industrial complex and become the world's second superpower despite deficiencies in its centrally planned economy because defence was given high priority status and special planning, rationing and administrative mechanisms were used to attain national security objectives. However, in the period 1976-85 the effectiveness of priority protection diminished and defence institutions experienced more of the problems typical of the shortage economic system. The heavy defence burden also created growing difficulties for the civilian economy. The attempts by the Gorbachev government to reform the defence sector and improve defence-economic relationships during perestroika (1985-91) uniformly failed. For most of the transition period, the Russian military-industrial complex has been adversely affected by its low priority status, cuts in defence spending, instability of the hybrid politico-economic system, and negative growth of the economy. The armed forces and defence industry have been reduced in size and their outputs of military services and equipment have fallen to low levels. Nevertheless, the Russian armed forces still have over one million troops, significant stocks of sophisticated conventional weapons, and a large nuclear arsenal. The government of President Putin has raised the priority of the defence sector, increased real defence spending, and adopted ambitious plans to revive Russian military power. It is likely, though, that tight resource constraints will hamper efforts to reform the armed forces and to upgrade weapons. By 2010 Russia will be an important, but not dominant, military power in Eurasia.     

Traffickers,terrorists, and a ‘new security challenge’: Russian counternarcotics strategy and the Federal Service for the Control of the Drugs Trade

The collapse of the Soviet Union precipitated the massive expansion of drug use and trade in Russia. The country now has one of the largest populations of injecting drug users in the world and has become the largest single-country market for Afghan heroin. In 2003 the Federal Service for the Control of the Drugs Trade was created to coordinate a comprehensive counternarcotics strategy appropriate to the scale of this threat. The service continues to face a number of challenges in its early stages of development. However, it has made considerable advances in improving responses to large-scale organised crime and in building international cooperation.