Pickands型推广估计量的渐近正态性

极值指数在许多实际领域广泛应用:如组合投资、风险值的计算、预报地震等, 估计极值指数γ以及它的性质的研究近年来成为极值统计理论的基本问题。主要研究极值指数γ的一个估计量:Pickands型推广估计量的渐近正态性质。首先研究由Pickands型推广估计量构成的一随机过程,得到了该过程的渐近分布;然后利用研究结果证明了Pickands 型推广估计量的渐近正态性,得到其渐近方差;最后对提出的Pickands型推广估计的平滑估计量进行了相应研究。     

On lifetimes in random environments

For a component operating in random environment, whose hazard rate is assumed to be the realization of a suitable increasing stochastic process, conditions are found such that its lifetime is increasing in likelihood ratio (ILR). For the lifetimes of two components of the same kind some comparisons based on partial stochastic orders are presented. Some applications to the case of repairable components are finally provided. © 1998 John Wiley & Sons, Inc. Naval Research Logistics 45: 365–375, 1998     

关于稳定 p 型 Banach 空间中有界 Borel测度的一个定理

本文推广了Ｅ．Ｄｅｔｔｗｅｉｌｅｒ［１］关于ｐ型Ｂａｎａｃｈ空间的结论,得到了在稳定ｐ型Ｂａｎａｃｈ空间上,有界Ｂｏｒｅｌ测度为某个无穷可分ｐ稳定测度的Ｌｅｖｙ测度的一个充分条件。     

舰船航行监控变量的微机产生方法研究

通过建立舰船航行监控变量的数学模型,提出了一种基于微机的产生舰船航行监控变量的实现方法,经过实际运用表明,能有效地监视和实时控制舰船航行．     

一种新型的P2P Tracker实现方法

流媒体数据已经在互联网流量中占据极高的比例,P2P是目前支撑互联网流媒体数据分发的重要手段。本文提出一种新型的P2P Tracker实现方法——eTracker。该方法通过网络边缘的eTracker分布实现peer列表的保存,不但消除传统集中式Tracker的性能瓶颈,而且通过eTracker对本地peer的识别,优化了P2P系统的peer选择。     

Emotions,Risk Perceptions and Precautionary Actions of Citizens During a Military Operation Using a New Defence Technology: The Israeli Case of the Iron Dome

Abstract

The current field study used unique data collected in Israel in July 2014, during a military operation that the Israel Defence Forces (I.D.F.) conducted in the Gaza Strip, in reaction to the thousands of missiles launched from there into Israel. During this operation, the new Iron Dome anti-missile defence system was used to protect Israelis exposed to missile attacks. The study examined factors that correlate with decisions to comply with I.D.F. defence instructions regarding behaviour during missile attacks. In addition, the study examined the relationship between attitudes towards the Iron Dome technology and emotions, risk perceptions, and the decision to comply with I.D.F. defence instructions. The results indicate that stronger positive opinions towards Iron Dome were correlated with lower levels of fear and anger, and beliefs that participant’s chances of being injured by a missile were lower than they had been during previous military operation. In addition, better compliance with I.D.F. defence instructions correlated with being more fearful, angrier at Hamas, living closer to Gaza Strip, and having more positive opinions about Iron Dome. The findings also indicate gender differences with respect to factors correlated with risk perceptions, opinions regarding Iron Dome, and precautionary actions during attacks.     

基于改进CS的随机PRI雷达精确测速及杂波抑制算法

传统的脉冲多普勒雷达存在严重的测距测速模糊和盲区效应。考虑在正常脉冲重复间隔(PRI)上叠加一个随机扰动,并把PRI的随机变化巧妙转化为稀疏观测矩阵的受限等距性质,提出的基于压缩感知的随机脉冲重复间隔雷达为全相参动目标检测提供了一种新思路。针对其在实际应用中存在的粗糙损失和杂波干扰两个问题,分别提出了基于局部词典细化的精确测速算法和基于改进优化模型的杂波抑制方法。仿真实验结果表明该方案具有较高的测速精度和较强的杂波抑制性能。     

多点源交叉波束干涉效应特征分析

介绍多点源交叉波束通过干涉效应实现交汇空间功率合成的基本原理,根据空间功率合成机理,建立对功率合成效率、同相叠加点间距的计算机仿真,完成多点源交叉波束干涉效应特征分析,以此作为多点源交叉波束空间功率合成的评估依据。     

任意分布随机数的FPGA实现

为了满足数字电路板的随机测试需求,在Simulink/DSP Builder中建立了产生任意分布随机数的模型,并在FPGA上进行了半实物仿真和性能分析,结果表明该模型达到了设计要求,具有实用价值。     

How and why Boko Haram blossomed: examining the fatal consequences of treating a purposive terrorist organisation as less so

Boko Haram (BH) is an insurgent group that operates mainly in northeastern Nigeria. Its stated aim is to establish an Islamic state, and it employs terrorism as its strategy. Earlier interests of security analysts centred on the drivers of BH uprising and the possibility of its internationalisation. Today's concerns relate more to why the rebellion has lasted this long. In toeing the same line, this article demonstrates that BH is a purposive terror group against which the government has evolved no viable strategy. It examines some gains of BH over the past six years and how it benefitted from the government's underestimation of its capacity and determination. It concludes that to effectively engage BH, the Nigerian government must revaluate its threat and sincerely pursue an expanded strategy beyond the current military-centric approach. To be effective, government's response must be packaged in such a way as to enhance human security in the region.