雷达检测概率的计算

雷达检测概率是评估雷达系统效能的重要指标,一般分为单脉冲检测概率和多脉冲检测概率.单脉冲检测概率的计算常用方法有两种,对这两种计算方法进行了验证,得出了两种计算方法相一致的结论.多脉冲的计算比较复杂,在原公式推导的基础上改进了多脉冲检测概率的计算模型,解决了原计算公式中脉冲积累数条件较难满足和虚警概率固定的问题.     

改进非凸估计与非对称时空正则化的红外小目标检测方法

针对复杂背景下的红外小目标检测,在非对称时空正则化约束的非凸张量低秩估计算法基础上,提出了一种新的核范数估计方法代替原算法中的估计方法。提出基于结构张量与多结构元顶帽(Top-Hat)滤波的自适应权重张量对目标张量进行约束,增强目标张量稀疏性的同时抑制其中残存的强边缘结构。实验结果表明,所提改进算法能够更好地消除图像中强边缘结构对检测结果的影响,在保证检测率的情况下,较原算法具有更低的虚警率。     

一种基于观测器的自修复飞行控制系统设计

故障检测与隔离(FDI)、控制律重构是自修复飞行控制系统设计的重要内容.在自修复飞行控制系统设计中,利用观测器,设计了针对传感器的故障进行检测的方法,可使检测效果在一定的条件下,对系统参数变化不敏感,具有较好的鲁棒性;此外,当飞机操纵机构发生故障时,利用观测器,设计了基于线性模型跟随控制进行飞行重构控制的方法,使得当状态变量不能测量时的控制系统得以物理实现.最后,给出了仿真实例,结果表明了该方法的可行性和有效性.     

Power and influence in post-secession South Sudan: A leadership perspective on nation-building

ABSTRACT

Following South Sudan's secession in 2011, the country faced significant political, social and economic challenges. The country emerged from a long andarduous nation-building journey, including almost 50 years of violent conflict, that would continue after declaring independence. This nation-building process would suffer a significant set-back in December 2013 when the most recent civil war broke out. This article provides a new perspective on South Sudan's nation-building trajectory that tends towards violence and complicates peace-building. It does so by utilising the leadership process approach from the Leadership Studies literature. While popular literature and commentary tends to fault the South Sudanese elite for the current crisis, there has not been a systematic effort to understand the leadership challenge and its role in conflict, peace and nation-building in South Sudan. In this article, South Sudan's nation-building process and its three primary components of (a) identity construction, (b) statehood and (c) collective will and responsibility, are analysed from a leadership perspective, focusing on issues of power and influence. The conclusion is reached that South Sudan's nation-building has been and will likely continue to trend towards a violent process due to a leadership process that lacks mutuality and is founded on insufficient sources of power.     

一种复合模式的人脸识别系统设计

通过综合考察红外 可见光图像人脸识别的优缺点,利用红外温谱图进行人脸检测与识别的优势,在研究可见光和红外人脸温谱图识别技术以及两者融合技术的基础上,提出和设计了一种新的红外 可见光复合模式的人脸识别系统。初步实验结果表明,这种识别方法不论从理论上还是从实验上都是可行的,系统具有良好的识别能力。     

The ligaments of counter-terrorism regime: sexual violence and the vicarious traumatisation of female non-governmental organisation workers: evidence from Nigeria

ABSTRACT

There is a dearth of studies on indirect victims of sexual violence in counter-terrorism efforts. Using Nigeria as a case study, this paper argues that global and state-level counter-terrorism policies have generally failed to account for the psychological effects of the engagement of female NGO workers in counter-terrorism operations or mitigating the effects of terrorism in conflict zones. Specifically, there has been an increase in sexual violence perpetrated by some members of the security agencies involved in counter-terrorism operations in North-eastern Nigeria. As a result, female NGO workers carry out Medicare, psychosocial counselling and advocacy for these victims. Female NGO workers become exposed to the trauma of victims of sexual violence, which affects their mental health and thus performances in counter-terrorism activities in the country. This altered their worldview on issues of safety even among secured locations or among the presence of security agents and reinforced feelings of powerlessness.     

The Ethics of Cyber Attack: Pursuing Legitimate Security and the Common Good in Contemporary Conflict Scenarios

ABSTRACT

Cyber attack against Critical National Infrastructure is a developing capability in state arsenals. The onset of this new instrument in national security has implications for conflict thresholds and military ethics. To serve as a legitimate tool of policy, cyber attack must operate in accordance with moral concerns. To test the viability of cyber attack, this paper provides a new perspective on cyber ethics. Cyber attack is tested against the criteria of the common good. This involves identifying the four core components of the common good from a conflict perspective: respect for the person; social wellbeing; peace and security; and solidarity. The fate of these components is assessed in relation to the six key characteristics of cyber attack from a moral standpoint: security; the role or absence of violence; discrimination; proportionality; cyberharm; and the threshold of conflict. It is concluded that the common good must be incorporated into developing state cyber strategies.     

Understanding women at war: a mixed-methods exploration of leadership in non-state armed groups

ABSTRACT

Recent efforts aimed at understanding women’s contributions to nonstate armed groups have produced large-scale data sets on female combatants (Wood and Thomas 2017) and more limited data on women’s roles as supporters and leaders in armed groups (Henshaw 2016; 2017, Loken 2018). The present study aims to build on this literature by providing new data on the scope of women’s leadership in insurgent groups. While existing quantitative literature has focused mostly on the experience of female combatants, we argue that the presence of women in leadership roles is crucial to understanding how gender might influence the outcomes of insurgency. We introduce new data on over 200 insurgent groups active since World War II. While our analysis confirms earlier small-sample work demonstrating women’s presence in leadership roles, a qualitative analysis reveals that leadership is often gendered–revealing patterns of tokenization and tracking women to low-prestige leadership roles. At the same time, our findings challenge past research on jihadist organizations, showing limited expansion in the authority of women.