惠普DesignJet Z6100大幅面打印机 为灾区绘出希望

抗震救灾,测绘先行!四川汶川地震发生后,在交通阻隔、通讯中断的情况下,一张张清晰而精准的地震灾区卫星遥感地图,成为了救援指挥人员及时了解受灾情况、解救受困人员、拯救生命的得力“助手”。为满足大量救援队伍对地震灾区基础地理数据的需求,国家某测绘单位在上级部门的统筹指挥下,充分发挥资源优势,克服重重困难,连续昼夜奋战,为抗震救灾工作提供了及时准确的测绘保障服务,确保了抗震救灾工作的顺利开展。     

求解柔性作业调度的共生进化算法

在柔性作业处理系统中,运行操作的机器、操作运行顺序及完成特定加工的操作集等均可含有柔性,作业调度的最优性依赖流程设计的结果。该文在共生遗传算法求解此问题的基础上,定义了一种新的适应度函数,将个体所参与的所有组合解的算术平均值作为此个体的适应度。引进较优的遗传交叉方法。仿真结果证明,新的适应度函数表现优异,对给定的复杂调度问题得到了更好的解。     

基于元数据的柔性信息系统建模与实现

介绍数据柔性、数据柔性分析等相关概念。通过引入元数据,提出并建立数据柔性的层次模型和柔性数据的访问模型,以解决用户数据结构如何适应转化的关键问题。在数据柔性分析与建模中,提出以元数据为核心的软件设计方法,并将该方法和所建立的数据柔性理论应用于柔性软件信息系统的开发和软件工程实践中。     

超级数据引擎Greenplum登陆中国市场

国内数据并行处理的行业应用开始崭露头角,信息技术基础建设较好的金融和电信行业需求依然强劲,政府、制造业和电力机构也逐渐成为数据仓库市场的新亮点。基于数据仓库的BI应用和数据挖掘正在成为市场新的投资热点。     

科华蝉联冠军 服务是基础

近日．中国工业和信息化部中国电子产业发展研究院赛迪顾问（CCID）正式发布了（2008—2009年中国UPS市场年度研究报告》。报告数据显示．厦门科华恒盛股份有限公司凭借良好的发展状态和合理的市场策略,2008年10KVA以上大功率UPS再次以超过10％的市场份额排名中国UPS整体市场前三甲,以绝对优势稳居国内大功率UPS市场第一．这也是科华年销售额连续11年蝉联国产UPS销售冠军。     

Sampled-data based average consensus with measurement noises: convergence analysis and uncertainty principle

In this paper, sampled-data based average-consensus control is considered for networks consisting of continuous-time first-order integrator agents in a noisy distributed communication environment. The impact of the sampling size and the number of network nodes on the system performances is analyzed. The control input of each agent can only use information measured at the sampling instants from its neighborhood rather than the complete continuous process, and the measurements of its neighbors’ states are corrupted by random noises. By probability limit theory and the property of graph Laplacian matrix, it is shown that for a connected network, the static mean square error between the individual state and the average of the initial states of all agents can be made arbitrarily small, provided the sampling size is sufficiently small. Furthermore, by properly choosing the consensus gains, almost sure consensus can be achieved. It is worth pointing out that an uncertainty principle of Gaussian networks is obtained, which implies that in the case of white Gaussian noises, no matter what the sampling size is, the product of the steady-state and transient performance indices is always equal to or larger than a constant depending on the noise intensity, network topology and the number of network nodes.     

关于计算机基础教育的研究与改革探讨

该文分析了当前计算机基础教学的现状以及存在的一些问题,进而从课程体系、课程内容、教学手段、教学方法、考核方式等环节进行了探讨,提出了高校计算机基础教育教学改革的思路和方法。     

Controllability of multi-agent systems based on agreement protocols

This paper investigates the controllability of multi-agent systems based on agreement protocols. First, for a group of single-integrator agents, the controllability is studied in a unified framework for both networks with leader-following structure and networks with undirected graph. Some new necessary/sufficient conditions for the controllability of networks of single-integrator agents are established. Second, we prove that, under the same topology and same prescribed leaders, a network of high-order dynamic agents is completely controllable if and only if so is a network of single-integrator agents. Third, how the selection of leaders and the coupling weights of graphs affect the controllability is analyzed. Finally, some numerical simulations are presented to demonstrate the effectiveness of the theoretical results.     

论高职高专医学类专业计算机基础教学改革与探讨

以计算机为基础的医学院校的教学和非计算机专业有共同点,但它有自身的特性。基于计算机的指令可以促进计算机知识的普及,作为正在形成,发展的人力资源市场,推动普及了计算机技术的应用。因此,加强计算机基础教学,学生实践能力的应用,特别是业务能力,已经成为所有学校的关注。在该文中,对医疗机构,教学基本电脑课程,内容,改革和创新考核方法进行了讨论。