电子战训练仿真系统开发方法研究

为了提高电子战训练仿真系统开发的效率和质量,参照建模与仿真领域和软件工程领域中的模型开发与运行过程模型,提出了一个基本开发过程,将基于高层体系结构HLA电子战训练仿真系统的开发划分为相互关联的9个阶段,规定了每个阶段的开发活动。展示了联邦成员软件自动生成工具KD-FedWizard在基于HLA电子战训练仿真系统分析、设计和实现中的应用。     

The Taliban's ‘military courts’

The Taliban's ‘code of conduct’, which lists rules of discipline for the fighters, has been widely discussed, but do the Taliban try to implement it? This article discusses the structures that the Taliban have put in place for this purpose and their evolution over the years. It assesses that while the Taliban's ‘military justice’ system is still work in progress, the fact that it has attracted a significant investment in human resources bears witness to a serious intent of the leadership. However, the Taliban's concern with the behaviour of their fighting force is driven by their own political calculus, not by any sympathy for the international law of conflict.     

信道带宽对CCRW算法码跟踪精度的影响分析

码相关参考波形(CCRW)技术能够适应复杂的电磁环境和实现优异的多径抑制性能,是目前卫星导航多径抑制研究的热点。相关文献对CCRW算法码跟踪精度的研究,主要是针对无限信道带宽条件下,仿真分析闸宽参数对码跟踪精度的影响,并未分析信道带宽影响。论文推导了CCRW算法码跟踪精度表达式,分析了信道带宽对CCRW算法跟踪精度的影响并进行了仿真验证。结论表明,在无限带宽下,减小闸波宽度可提高码跟踪精度,但是在带限条件下,闸波宽度存在最优值。该结论可用于指导卫星导航接收机的CCRW算法设计。     

谈利用网络资源提高办刊质量的方法与途径

在信息化技术迅猛发展的背景下,如何利用网络资源加强学报建设与发展,成为编辑工作者普遍关注的问题之一。组稿和审稿在期刊编辑工作中具有举足轻重的作用。针对当前公安院校学报在组稿和审稿工作中存在的问题,提出利用网络资源解决问题的途径。     

认知建构理论及其对语言教学的启示

第二语言习得的研究出现多元化现象，研究者从不同的角度、不同的侧面进行深入的研究，提出了许多新的观点。随着这一领域研究的深入，研究学习者外语学习的心理一认知过程逐渐成为第二语言习得领域学者关注的热点。本文认为学习者坚持语言学习不仅仅是习惯的养成，而是一种语言习得、脑力劳动和认知发展过程，强调学习者在语言学习过程中的积极作用，有利于促进第二语言的获得。     

Timing of information acquisition in a competitive environment

This article investigates the impact of timing on sellers' information acquisition strategies in a duopoly setting. Market uncertainty is captured by a representative consumer who has a private taste for the product's horizontal attribute, and both sellers can acquire this information either before (ex‐ante acquisition) or after (ex‐post acquisition) observing their own product qualities. We identify several conflicting effects of information acquisition that vary significantly in its timing and market characteristics. In the monopoly scenario, information acquisition is unambiguously beneficial and ex‐ante acquisition is the dominant option, because it helps a seller not only design the proper product but also craft better pricing strategy. By contrast, when there is competition, information acquisition eliminates the buffer role of market uncertainty and leads to the fiercest production or pricing competition, which makes the subsequent effects of acquisition detrimental, and a seller's payoff is nonmonotonic in terms of its acquisition cost. Moreover, compared with the ex‐ante information acquisition, ex‐post information acquisition normally generates higher sellers' equilibrium payoffs by postponing the timing of acquisition and maintaining product differentiation. Nonetheless, ex‐post information acquisition also provides the seller with greater acquisition incentive and occasionally makes him worse off than that in the ex‐ante scenario. Thus, in a competitive environment, having the option of information acquisition and flexibility in its timing can be both detrimental and irresistible. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 3–22, 2016     

数据和导频通道的功率加权联合捕获算法

下一代全球导航卫星系统将采用数据和导频通道功率不等的调制方式,而传统算法多采用数据和导频通道的等权重加权联合进行捕获。当二者功率不相等时,等权重加权联合不能获得最优的捕获性能。因此提出功率加权联合的改进捕获算法,在数据和导频通道的功率分配不等的情况下,进行不同加权系数的联合捕获,并且利用最小二乘的方法进行最优加权系数的拟合估计。利用捕获判决量的特征函数推导检测和虚警概率。仿真实验验证了当数据和导频功率比为1∶3、检测概率为0.8、虚警概率为10-3时,所提出的改进算法能提升0.4 d B的捕获灵敏度。     

铁路区间信号系统测试评估平台——自动闭塞移频信号的数据采集及验证

铁路区间信号系统测试评估平台中数据采集和验证子系统研究移频信号的数据采集、A/D转换和信号显示,移频信号的处理是对被测系统发送和接收的移频信号的载频和调制低频鉴频鉴幅,进行验证,为测试评估平台对被测系统的功能、可靠性和安全性评估作必要的数据准备.     

基于程序特征分析的流处理器VLIW压缩技术与解压实现

代码体积和代码稀疏是VLIW处理器一直存在的问题.通过对一系列典型应用在流处理器上的程序特征进行分析,提出了一种新的VLIW分域压缩技术,剔除各个子域中的空操作,并设计了分布式指令存储器对压缩后的代码进行解压缩执行.实验证明,该技术能够减少MASA流处理器中近39％的片外指令访存,降低约65％的片上指令存储器空间需求;同时使得指令存储器面积和系统面积分别减少了约37％和8.9％.     

高动态环境下BFSK信号的快速解调算法

提出了一种适用于高动态环境下,BFSK信号的快速解调算法。该算法基于FFT频率引导和改进的正交锁相环,利用FFT实现对接收信号的快速捕获,利用改进的正交锁相环对接收信号进行动态跟踪。仿真结果表明在高动态环境中该算法可以快速、准确解调BFSK信号。