Automated integration of real-time and non-real-time defense systems

Various application domains require the integration of distributed real-time or near-real-time systems with non-real-time systems.Smart cities,smart homes,ambient intelligent systems,or network-centric defense systems are among these application domains.Data Distribution Service(DDS)is a communi-cation mechanism based on Data-Centric Publish-Subscribe(DCPS)model.It is used for distributed systems with real-time operational constraints.Java Message Service(JMS)is a messaging standard for enterprise systems using Service Oriented Architecture(SOA)for non-real-time operations.JMS allows Java programs to exchange messages in a loosely coupled fashion.JMS also supports sending and receiving messages using a messaging queue and a publish-subscribe interface.In this article,we pro-pose an architecture enabling the automated integration of distributed real-time and non-real-time systems.We test our proposed architecture using a distributed Command,Control,Communications,Computers,and Intelligence(C4I)system.The system has DDS-based real-time Combat Management System components deployed to naval warships,and SOA-based non-real-time Command and Control components used at headquarters.The proposed solution enables the exchange of data between these two systems efficiently.We compare the proposed solution with a similar study.Our solution is superior in terms of automation support,ease of implementation,scalability,and performance.     

A novel DOA estimation algorithm using directional antennas in cylindrical conformal arrays

In this paper, a novel direction of arrival (DOA) estimation algorithm using directional antennas in cy-lindrical conformal arrays (CCAs) is proposed. To eliminate the shadow effect, we divide the CCAs into several subarrays to obtain the complete output vector. Considering the anisotropic radiation pattern of a CCA, which cannot be separated from the manifold matrix, an improved interpolation method is investigated to transform the directional subarray into omnidirectional virtual nested arrays without non-orthogonal perturbation on the noise vector. Then, the cross-correlation matrix (CCM) of the sub-arrays is used to generate the consecutive co-arrays without redundant elements and eliminate the noise vector. Finally, the full-rank equivalent covariance matrix is constructed using the output of co-arrays, and the unitary estimation of the signal parameters via rotational invariance techniques (ESPRIT) is performed on the equivalent covariance matrix to estimate the DOAs with low computational complexity. Numerical simulations verify the superior performance of the proposed algorithm, especially under a low signal-to-noise ratio (SNR) environment.     

家庭教育四题

教人做人是家庭教育的根本职能,教育引导与顺其自然相结合是家庭教育的基本原则,心理健康教育是家庭教育的重要内容,提高家长素质和育人水平是搞好家庭教育的关键。     

解读《史记》中“发奋自强”之精神

本文通过条析《史记》历史人物的兴衰成败及论赞司马迁的人生价值观,反复强调发奋自强精神的重要性。发奋自强的民族精神是我们取胜的法宝之一。     

枪械产品可靠性建模方法研究

选择适当的建模方法, 并在分析枪械产品可靠性试验特点的基础上提出了相应的假设, 讨论了确定具体模型类型的方法及不同类型数据的参数估计和检验手段。借鉴电子产品可靠性建模方法提出了针对枪械产品可靠性模型的建立步骤, 并结合某型自动步枪寿命试验数据给出计算实例。     

自润滑弹带挤进过程中渗出油量的对比计算

从弹带的作用及特性出发, 通过数值计算和统计计算 2种方法计算了自润滑弹带挤进过程中的渗出油量,初步得出了渗出油量和行程之间的关系。这一问题的解决为自润滑弹带材料的选择提供了理论依据。通过对 2种算法的比较可知, 数值计算误差更小一些, 而统计计算对数学条件要求不太苛刻。     

扭杆式坦克悬挂系统的强度分析

针对目前悬挂系统设计理论的不足,运用工程力学中的卡氏第二定理和莫尔法求出负重轮行程与所受载荷之间的理论关系,并考虑了平衡肘的变截面对应力状态的影响,进而得到系统内关键点处的应力值;在理论分析的基础上,由简单到复杂,分别建立了初步模型、修正模型和最终的实体模型.应用有限元软件对悬挂系统进行三维数值模拟,计算了悬挂系统的应力场和位移场.理论分析和数值模拟的结果表明:悬挂系统力学模型较好地描述了悬挂系统的实际情况;有限元计算模型对于扭杆式悬挂系统强度计算非常有效,所得应力集中区与实际失效情况基本一致;应用本研究结果,可对悬挂系统作进一步的疲劳分析.     

两栖装备乘员可靠性影响因素分析

人的可靠性指的是人在规定的时间内、规定的条件下、完成规定任务的能力,它是整个系统可靠性一个重要的组成部分,作为装甲装备而言,乘员可靠性的高低直接影响到整个装备作战系统可靠性.针对两栖装备的使用环境和使用特点,对影响乘员可靠性的因素进行了分析,得出了结论,对于如何提高两栖装备乘员可靠性有一定的指导意义.     

论工程款和民工工资拖欠问题产生的原因及对策

文章就工程款和民工工资拖欠问题产生的原因及对策作了系统分析,认为从源头上抓起和管起、从环节上把关控制、从全过程监督和防范、从企业自身规避和降低风险、从法律上寻求保障和途径,来有效解决工程款和农民工工资的拖欠问题。     

论几种特殊的文言修辞方式

文章针对文言中几种特殊的修辞方式进行了较为深入的探讨和分析,从阅读、理解和欣赏的角度阐述了几种文言修辞的规律,着重分析了这几种文言修辞的特点,有助于提高读者的文言阅读水平和培养良好的语言素养。