VXI bus数据采集系统的研究与开发

VXI bus是继GPIB总线之后,在PC机广泛应用的基础上,融合了VME bus和GPIB而产生的新一代模块式仪器总线。本文讨论了怎样在GPIB环境下采用VXI bus标准组建新型的自动测试系统,并结合一个基于VXI bus数据采集系统的设计实践,探讨了选用VXI bus标准需要考虑的若干重要技术问题。该系统作为机电部“七五”重点军事预研项目“计算机辅助测试(CAT)工作站”的一个重要应用子系统,于1992年元月在北京通过了部级技术鉴定,并引起了有关部门的高度重视。     

基于GPU的北斗B1宽带复合信号实时发生器设计

为了实现北斗B1C+B1I信号的联合生成,提出一种基于软件无线电和图形处理器(graphics processing unit, GPU)加速的北斗B1宽带复合信号的实时生成方法,该方法针对单边带复数二进制偏移载波(single-sideband complex binary offset carrier, SCBOC)调制方式的信号体制进行设计,系统根据用户配置的接收机运动轨迹和星历文件,生成中频信号并通过射频端发射。为了进一步提升GPU并行运算速度,从优化设备内存结构、设计并行线程架构和统一计算设备架构流(compute unified device architecture stream, CUDA)加速3个方面,设计了基于异步运算的加速采样点数据计算的CUDA优化实现方案。测试结果证明,优化后的算法可以基于SCBOC调制实时生成北斗B1I+B1C信号,基于GTX3060的GPU平台,信号90 M采样率下能实现8颗卫星复合信号的实时生成。     

基于VXI总线的某型飞行器自动测控系统研制与应用

VXI总线作为一种新型的模块化测量仪器标准总线,适用于航天领域,包括各种飞行器的综合测试.本文介绍一种用于某型飞行器综合测试的自动测控系统,是按某类飞行器综合测试系统的基本型概念,以VXI总线技术为基础设计的.该系统已于1994年研制成功,并已投入实际使用两年,效果很好,具有在本领域内推广应用的价值.     

可叠加的ATM接口交换板的设计与实现

提出了一种可叠加的新型ATM接口交换板,由ATM物理层接口、ATM层翻译逻辑、共享存储器交换网络、ATM信令处理单元以及计算机控制与管理系统等组成,具有在板交换、信令插入/提取,以及本地CPU信令分析处理功能.折叠式交换单元通过背板混洗总线进行互连,构成分布式ATM交换机,扩容简单且性能/价格比高.描述了新型接口交换板的系统结构、各部分组成和具体实现.     

现场测控网络总线与以太网互联系统设计

针对控制网络与信息网络互联及设备远程控制的应用场合,提出了一种基于微控制器的ControlAreaNet现场总线(CAN总线)与以太网互联方案。该方案采用微控制器作为异构网络互联的网关,直接驱动IEEE802.3以太网和CAN数据链路层协议芯片并解析TCP/IP和CAN应用的上层协议,因而在无需大量资源的情况下,可获得一种高效、可靠和廉价的互联网关。通过系统扩展,可形成一个完整的CAN总线与以太网互联控制系统,实现设备远程控制和资源统一管理。给出了一个完整的CAN总线与以太网互联控制系统,实现设备远程控制和资源统一管理。给出了方案实现的具体设计思想并通过实验证明该互联方案的可靠性和有效性。     

基于CAN总线的分布式无人机实时仿真设备研究

CAN总线在汽车与工业过程控制领域应用广泛,并扩展到航空航天领域.设计了一种基于CAN总线的小型分布式实时仿真设备,用于在外场开展无人机半物理实时飞行仿真试验.根据实时仿真设备对CAN的实时性需求,提出了一种基于时间触发的,并充分发挥了CAN本身位仲裁机制优点的CAN总线高层协议.实验表明该协议完全满足实时仿真设备的实时性要求;同时也表明其提高了总线的带宽利用率达80%以上,适合于需要在较短周期内传输大量数据的应用.     

一种DSM系统中主控结点的设计与实现

介绍了一种适应雷达信号处理的DSM系统的核心控制者(主控结点)的设计与实现。基于PentiumⅡ300工业级单板计算机的主控结点为操作系统的引入提供了硬件平台，提高了系统的可编程性、可扩展性。主控结点建立结点映射表的机制提高了系统的可重构性、可扩展性。主控结点利用基于PCI总线的控制芯片实现它与系统总线间的通信，从而提高了指令传输速率，满足了雷达信号处理实时性的要求。     

火控系统综合仿真作战飞行软件研究与设计

本文介绍一种基于１５５３８总线的分布式火控系统地面综合仿真系统中作战飞行软件设计。首先对综合仿真系统的功能和组成作了简要介绍，然后给出了作战飞行软件的设计思想和框图。该设计成果已做为主机厂研制新一代战斗机的实验仿真     

基于子带信号的MPSK载频估计算法

均匀子带技术是宽带信道化中经常采用的数据处理方法。针对均匀子带信道化易造成信号频谱割裂的问题,建立了M进制移相键控(M phase-shift-keying,MPSK)信号子带信道化输出的数学模型。将目标信号的频谱损失转化为码元成型函数的变化,证明子带信号保留了原信号码元成型函数所带来的循环平稳特性,提出了一种新的基于子带信号M次方谱的载频估计算法。该方法无需合并子带就可进行目标信号的参数估计,提高了宽带处理的效率。仿真分析了算法在不同带宽覆盖比和不同信噪比下的估计性能。理论分析和仿真结果证明了算法的有效性和可靠性。     

一种实时信号处理平台的实现及其应用

结合高分辨率测深侧扫声纳(HRBSSS)的研制和应用过程,提出了一种基于PC104-Plus总线的小型实时信号处理平台。该平台根据系统对控制和运算的需求选择了CPU-T6VEF型PC104-Plus总线CPU板,加装Hammerhead-PC/104-Plus DSP板,采用Linux操作系统,可以方便地进行软件开发,具有很高的灵活性和实用性。实验表明,该平台可以完成HRBSSS中数据的实时信号处理任务,可广泛应用于通信、图像处理、语音处理、雷达、医疗等领域。     

The 12th International Conference on Service Systems and Service Management ICSSSM'15

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Enterprise resource planning implementation decision & optimization models

To study the uncertain optimization problems on implementation schedule, time-cost trade-off and quality in enterprise resource planning (ERP) implementation, combined with program evaluation and review technique (PERT), some optimization models are proposed, which include the implementation schedule model, the timecost trade-off model, the quality model, and the implementation time-cost-quality synthetic optimization model. A PERT-embedded genetic algorithm (GA) based on stochastic simulation technique is introduced to the optimization models solution. Finally, an example is presented to show that the models and algorithm are reasonable and effective, which can offer a reliable quantitative decision method for ERP implementation.     

A calculus for services innovation

Innovation in the services area - especially in the electronic services （e-services） domain - can be systematically developed by first considering the strategic drivers and foci, then the tactical principles and enablers, and finally the operational decision attributes, all of which constitute a process or calculus of services innovation. More specifically, there are four customer drivers （i.e., collaboration, customization, integration and adaptation）, three business foci （i.e., creation-focused, solution-focused and competition-focused）, six business principles （i.e., reconstruct market boundaries, focus on the big picture not numbers, reach beyond existing demand, get strategic sequence right, overcome organizational hurdles and build execution into strategy）, eight technical enablers （i.e., software algorithms, automation, telecommunication, collaboration, standardization, customization, organization, and globalization）, and six attributes of decision informatics （i.e., decision-driven, information-based, real-time, continuously-adaptive, customer-centric and computationally-intensive）. It should be noted that the four customer drivers are all directed at empowering the individual - that is, at recognizing that the individual can, respectively, contribute in a collaborative situation, receive customized or personalized attention, access an integrated system or process, and obtain adaptive real-time or just-in-time input. The developed process or calculus serves to identify the potential white spaces or blue oceans for innovation. In addition to expanding on current innovations in services and related experiences, white spaces are identified for possible future innovations; they include those that can mitigate the unforeseen consequences or abuses of earlier innovations, safeguard our rights to privacy, protect us from the always-on, interconnected world, provide us with an authoritative search engine, and generate a GDP metric that can adequately measure the growing knowledge economy,     

论生物系统中的功能不守恒性

根据能量守恒定律，能量一次转换所做的总功应等于输入的总能量。但在生物系统中，能量的转换是多次的，其总功之和大于系统输入的总能量，此现象称之为功能不守恒性。能量转换效率越高，功能差别越大。能量通过细胞水平的多次转换，总功可提高至2倍左右。能量通过生态系统水平多次转换，总功可提高至1．4倍左右。通过系统内各子系统能流之和称为序能，反映了系统有序性大小，它取决于系统输入总能量和能量转换效率。根据序能原理，用GDP^2／9(GDP为国内生产总值，Q为能量总输入)反映人类社会功能和效率，要比单纯用GDP更客观。绿色GDP应同时考虑使GDP^2／Q增长最大和使自然生态系统的序能最大。人的经济行为和动物的行为对策也符合序能原理。     

Dealing with Human Relations in Chinese Systems Practice

This paper is about the Wuli, Shili, Renli (WSR) systems methodology. An important concept within this, Renli, has been developed from Confucian philosophy to clarify to Chinese researchers the necessity of dealing with human relations in systems practice. At present, the only formal means of operationalizing Renli that people are exploring in China is to import from the West methods for organizing debate. However, the concept of Renli suggests that more is needed than methods alone. In particular, facilitation skills are required. It is argued that the development of facilitation skills can be enhanced if researchers can gain both theoretical and practical knowledge of group dynamics, and engage in activities of self-reflection to look at, and alter, their own roles in these dynamics and the wider sociopolitical system. There are therefore three aspects to Renli: the use of systems methods for organizing debate, the acquisition of facilitation skills, and self-reflection geared toward the development of facilitation skills and enhanced critical awareness of the politics of intervention.     

云环境中邮件服务器面向传输的优化设计

随着云计算的发展,新的应用不断涌现,但电子邮件服务依然占有着重要的地位.邮件服务器是一种I/O密集的应用.在云计算时代,越来越多的用户邮件保存在服务器端,邮件在从客户端传输到服务器端之前,邮件或者邮件的部分内容在服务器端可能已经存在.基于这种现象,提出了一种方案,通过引入计算的代价来降低通信量,从而提高邮件服务器的处理能力.对电子邮件的格式和SMTP协议进行了扩充,引入了附件和正文分离传输的模式.在邮件传输时,客户端先计算附件的散列值,并作为正文的一部分传输到服务器端,服务器端再根据散列值来判断附件是否需要传输.     

金工工艺的优化设计

运用价值工程与运筹工程理论, 在金工工艺单项设计指标优化的基础上, 对其设计指标也进行了全面优化。     

THE 8~(th) INTERNATIONAL CONGRESS ON INDUSTRIAL AND APPLIED MATHEMATICS

正August 10-14,2015Beijing,China The International Congress on Industrial and Applied Mathematics(IClAM)is the premier international congress in the field ofapplied mathematics held every four years under the auspices ofthe International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists and entrepreneurs fiom around the world will gather in Beijing,China for the 8th IClAM to be held at     

基于动力学仿真的多管火箭多因素分析

多管火箭武器的系统效能有多个指标,而每个指标又受到多个因素复合影响。按照武器系统效能分析的递阶层次,梳理了多管火箭性能分析的多因素问题。提出了基于虚拟样机动力学仿真过程多因素问题的数据挖掘方法及分析手段,弥补了传统方法对多因素问题决策分析的不足。并以多管火箭系统效能第四级指标起始扰动的三种影响因素为例进行了研究和验证。