基于组合媒质通道模型的地下目标成像

由于电磁波在穿越不同介质时会出现折射现象,因此在地下目标成像过程中,电磁波信号穿越从雷达到地下目标的组合通道的路径不是直线而是折线,此时利用常规的自由空间中的合成孔径成像方法已经不能对目标进行成像。基于电磁波的传播规律和地层有耗媒质的特性,提出了电磁波传输的组合通道模型,并将其应用到地下目标成像中。通过仿真比较可以看出,使用组合通道模型对地下目标成像效果有明显的改善,组合通道模型适用于对分层土壤中的地下目标成像。     

基于小波变换的海面红外弱小目标检测中实时性研究

针对凝视型红外预警系统在复杂海面背景下对弱小信号检测的实时性问题,提出了压缩监测区域、危险度分级、舍弃小波变换后的低频分量部分和检测图像中的零信号4种优化型算法,减少了系统的运算量,提高了系统的运算速度,满足了系统实时性的要求,并且降低了系统的虚警率,保证了系统对强起伏背景的抑制效果。     

基于生物视觉原理的图像结构信息变化检测方法

为克服多时相遥感图像变化检测中照度差异和配准误差的影响,采用边缘结构信息进行变化检测。利用多方向Gabor函数从图像梯度强度图中提取边缘结构信息,称之为边缘标记(Edge Tag,ET),通过比较多时相遥感图像中ET的互相关系数实现变化检测。为减小差异较小的边缘对检测结果的影响,在相关系数的计算中引入抑制因子。仿真图像和真实图像的实验结果表明,该方法能克服图像照度差异和配准误差对变化检测的影响,取得了较好的检测效果。     

建筑火灾烟气蔓延规律对火灾探测系统的影响

分析了烟在建筑物内部的蔓延规律,讨论了烟气的蔓延规律、气流速度、障碍物及房间高度对火灾探测系统的影响,得出研究火灾烟气蔓延规律对火灾探测系统的可靠性具有重要意义的结论。     

一种多级式带反馈的混合系统检测融合算法

为提高分布式检测系统的性能,提出了一种多级式带反馈的混合检测系统结构,系统第一级检测采用并行结构,第二级检测采取带反馈的串行结构。根据此系统结构,分析了在N-P准则下,各局部融合中心的融合规则和门限的确定,仿真结果表明,系统的检测性有明显改善。     

A stochastic model for burn‐in procedures in accelerated environment

Burn‐in procedure is a manufacturing technique that is intended to eliminate early failures of system or product. Burning‐in a component or system means to subject it to a period of use prior to being used in field. Generally, burn‐in is considered expensive and so the length of burn‐in is typically limited. Thus, burn‐in is most often accomplished in an accelerated environment in order to shorten the burn‐in process. A new failure rate model for an accelerated burn‐in procedure, which incorporates the accelerated ageing process induced by the accelerated environmental stress, is proposed. Under a more general assumption on the shape of failure rate function of products, which includes the traditional bathtub‐shaped failure rate function as a special case, upper bounds for optimal burn‐in time will be derived. A numerical example will also be given for illustration. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

TIME-VARYING CHARACTERISTICS OF SOUTH KOREA-UNITED STATES AND JAPAN-UNITED STATES MILITARY ALLIANCES UNDER CHINESE THREAT: A PUBLIC GOOD APPROACH

This paper investigates the nature of two military alliances under Chinese threat. The findings are as follows: First, South Korea does not consider China a significant threat while Japan and the United States have recognized China as a serious threat since the 1990s and the 2000s, respectively. Second, the relationship between South Korea and the United States is a true military alliance for all time periods, but the nature of the alliance has changed since the 1970s. Third, although Japan began to form an alliance relationship with the United States in the 1990s, Japan is considered a more significant ally by the United States. This paper implies that, should China provoke a military confrontation, it might be difficult to deduce a common solution among the three countries because of the different response to military threats from China.     

Strategic defense and attack for series and parallel reliability systems: reply 1 to comment 1

Kovenock and Roberson's [2011] comment provides initial work which has the potential, when suitably extended, to advance the research frontier. Kovenock and Roberson's paper consists of three sections. The first section is an interesting introduction. The second section, titled ‘Model and Main Result,’ provides no contribution beyond Hausken [2008a]. It consists of Equations (1)–(10) which are equivalent to equations developed by Hausken, and Equation (11) which is equivalent to the utility requirements u???0 and U???0 provided after Equation (17) in Hausken. The third section provides interesting ideas about mixed-strategy equilibria that can be extended in future research.     

PEACEKEEPERS AS PERPETRATORS OF ABUSE

I am afraid there is clear evidence that acts of gross misconduct have taken place. This is a shameful thing for the United Nations to have to say, and I am absolutely outraged by it.

—Kofi Annan, United Nations Secretary-General

Despite promulgating a comprehensive set of guidelines to deter UN personnel from committing acts of sexual misconduct, allegations of sexual exploitation and abuse have become widespread within United Nations peacekeeping missions. The policy of zero-tolerance for peacekeeper misconduct has not been matched by strong disciplinary measures, and crimes are often ignored and rarely punished: absentee fathers, rapists and murderers simply disappear back in their home countries. In countries where women and children rarely have the same economic resources, political rights and authority or control over their environment—or their bodies—they easily become prey for those in perceived positions of power and authority. By failing to hold those responsible to account, the UN may in fact be fuelling even greater discrimination and violence against women and children. In order to ensure those who are mandated to protect to do not become perpetrators of abuse, the UN must take a stronger stand against those who commit acts of sexual misconduct, and must ensure that victims see that their abuser is brought to justice and that reparation is offered. A recent report submitted by the Secretary-General's Special Envoy on Sexual Exploitation and Sexual Abuse makes a comprehensive set of recommendations to prevent, detect, and respond to these allegations. The aim of this essay is to highlight some of the main points of the Special Envoy's report, and to examine the practical challenges the UN and troop/police contributing countries will face when attempting to implement these recommendations.     

位置随动系统动态性能自动检测研究

通过分析某型位置随动系统的组成和动态技术指标,提出了位置随动系统动态性能自动检测的设计方案和测试方法,利用信号仿真模块和基于DSP的高速数据采集与处理模块,建立了自动检测的硬件电路和软件结构,确定了测试位置随动系统的动态性能指标、测试方法和软件功能,实现了对某型位置随动系统动态性能的自动检测．