Filibustering from Africa to the Americas: non-state actors and empire

This article looks at dominant definitions of empire, in particular those emphasizing large polities as the sole agents of imperial expansion. By doing so, it draws attention to the overlooked role of filibusters: private, non-state actors who initiate unauthorized military endeavours, either in an attempt to carve out empires for themselves or for their home state. It demonstrates that filibustering is not a practice unique only to the Americas or to the nineteenth century as so much of the literature suggests. Lastly, it scrutinizes the cultural and historical impact of the phenomenon. In terms of the former, it argues that filibustering had an important literary and filmic influence. Regarding the latter, it advocates that it frequently led to further violent intercessions in many of the countries occupied and influenced a particular style of proto-fascistic and charismatic militarism.     

Escalation and de-escalation of violence in insurgencies: Insights from Northeast India

Insurgencies in the Northeast of India have been a recurring phenomenon since India's independence in 1947. One of the most significant aspects of the multiple insurgencies has been the use of violence for political goals. By drawing upon three cases of insurgencies in Northeast India, the article offers a conceptual framework on escalation and de-escalation of violence in insurgencies. The article argues that the most critical variables which have a direct bearing on the levels of insurgent violence are: popular support, loss of legitimacy and the state's counter-response.     

手绘非规则军标图形的结构化识别方法

在基于草图的态势标绘系统中,线状和面状军标图形通常是依具体地形、战况、意图等标绘的,没有规则的形状,难以采用基于表观的方法进行识别。针对这类手绘非规则军标图形提出了一种结构化识别方法,基于非规则军标图形集的特点定义了9种图元和4种图元间空间结构关系,将图形表示为图元向量和图元结构关系矩阵,通过匹配图元向量和图元结构关系矩阵来识别图形类别,并估计未知图形与模板图形之间的图元对应关系。实验结果表明:本文方法能有效克服图形形状变化的影响,对手绘的常用非规则军标图形的类别和图元对应关系具有较高的识别正确率和识别速度。     

Counterinsurgency or irregular warfare? Historiography and the study of ‘small wars’

This article argues that the history of irregular warfare provides a valuable analytical and critical perspective for the study of counterinsurgency campaigns and counterinsurgency doctrine. A focus on the history of irregular warfare highlights the close relationship between warfare in Europe and in the colonies. Moreover, it enables us to identify more exactly the intersection of multiple factors that lead to an escalation of violence in small wars. Finally, it also sheds light on the lack of strategic reflection on the use of irregular auxiliaries that is characteristic for many counterinsurgency campaigns.     

面向GPU的5G新型无线电的高吞吐率LDPC译码器

提出了一种基于图形处理单元(graphic processing unit, GPU)的5G软件无线电准循环低密度奇偶校验(low density parity check, LDPC)码译码器,为了节省片上和片下带宽,采用码字缩短和打孔技术、两级量化和数据打包方案,以提升数据带宽的利用率。实验基于Nvidia RTX 2080Ti GPU平台实现了高码率情况下的最小和近似译码算法的并行译码,通过分析GPU上的最优线程设置,将码率为5/6的(2 080,1 760) LDPC算法的译码吞吐率提升至1.38 Gbit/s,译码吞吐率性能优于现有其他基于GPU的LDPC译码器。     

基于变量节点串行消息传递的LDPC码译码研究

针对标准LDPC码译码中洪水消息传递机制的不足,提出以串行机制进行消息传递,按照变量节点的顺序进行消息处理和传递,对每个变量节点同时接收校验消息和发送变量消息。该方法使更新的消息能够很快进入当前迭代计算,改善了LDPC迭代译码的收敛性能。通过对几种常用译码算法的仿真比较,验证了在复杂度不增加的情况下,该方法性能优于其它几种最大后验概率准则的译码方法,且算法收敛快,是一种能较好兼顾性能与实现复杂度的译码方法。     

光纤通信系统用减反膜的研究

针对WDM光纤通信系统对具有极高透过率的光学薄膜元件的需要,系统地研究了增透膜的设计与镀制.采用统计实验求总极值法和Powell最小二乘法相结合的多级优化方法编制程序,完成了以BK7玻璃为基底的增透膜的膜系设计,采用多种监控方法完成了此类非规整膜系的镀制实验.测试结果表明,采用变过正量极值法监控非规整膜系的镀制,可精确控制各层膜的光学厚度,获得在1550nm波段附近具有很高透过率的光学薄膜元件.     

基于节点选择更新的简化LDPC译码算法

文中通过分析信息在短环中传递的特性,提出了一种基于节点选择更新的简化LDPC译码算法。该算法可以通过在一定程度上避免短环对译码的影响来降低译码运算复杂度。仿真结果表明对于二元以及多元LDPC码,该算法相对于BP算法只有少量性能损失。     

LDPC编码跳频通信系统中的迭代抗干扰抑制算法研究

文中讨论 LDPC 码在抗干扰跳频通信中的应用问题。在接收机几乎没有任何信道先验知识(包括信噪比/信干扰比,部分频带干扰信息等)的假设下,推导了一种新的鲁棒检测算法。该鲁棒检测算法与最小和迭代解码算法结合可成功用于 LDPC 码的有效接收,性能逼近理想不可实现条件下的最佳检测算法。     

基于条件矩阵的LDPC码构造及其在MBC系统中的应用

根据流星余迹信道的特点,在分析LDPC编译码算法的基础上,提出在流星余迹通信(MBC)中使用基于条件矩阵的LDPC编码,使其适应流星信道特点,提高系统性能。仿真结果表明,这种LDPC编码较RS码和Mackay随机构造的LDPC编码有更优的性能。