CloudSim中基于优先级的轮询服务代理算法     

刘君玲 《莆田学院学报》2014,(5):58-60

针对服务代理采用的现有数据中心选择算法存在系统性能低和总体成本高等问题,提出一种基于优先级的轮询服务代理算法。该算法对数据中心的优先级进行定义,并根据数据中心的优先级选择数据中心。通过基于CloudSim仿真器的实验,结果证明该算法比现有数据中心选择算法拥有更好的性能。  相似文献   

R&D co-operation and innovation a microeconometric study on French firms     

S. Negassi 《Research Policy》2004,33(3):365-384

The scope of this paper is to report new empirical evidence on the determinants of R&D co-operation. Indeed, the literature on the capabilities of firms emphasises the role of knowledge in the performance and evolution of firms who use knowledge developed in others to build their own knowledge capital. R&D co-operation between firms is one of the many strategies by which this knowledge may be transmitted. Several theoretical models have stressed that R&D co-operation is more likely when the level of spillovers is high. While this supposition is used in many theoretical models, it has rarely been tested before. Our results do not lend strong support to this intuition. Indeed, our spillover variables (national pure spillovers, national rent spillovers and imports of machine tools), which were supposed to match the theoretical notion of spillovers used in these theoretical models have a positive but not a significant role when explaining R&D co-operation. The R&D co-operation increases with size and with R&D intensity, but not with market share. It also increases with the budget spent on paying license fees and on acquiring patents and labour from foreign firms. In this study, we also analyse the determinants of innovation. In more precise terms, we compare the effects of R&D co-operation to those played by traditional internal factors and those exerted by external, pure and rent spillovers on the innovation capacity of the firms. Our results show that the commercial success of innovations of French firms depends mainly on size, market share, R&D intensity and human capital. Inward FDI from industrialised countries exerts a positive and significant effect. The finding highlights the important role of the absorptive capacity of firms. Spillover measurements, such as the acquisition of machine tools, foreign patents, licenses, and technological opportunities have a positive impact on innovation.  相似文献   

中国兰科植物一新种——云南巾唇兰     

陈心启  罗毅波 《中国科学院研究生院学报》2004,42(5):457-459

对中国兰科植物新种云南巾唇兰Pennilabium yunnanense S.C.Chen&Y.B.Luo作了 描述和绘图。该新种与P.acuminatum（Ridley）Holttum较为接近，区别点在于具较小的花朵 ，直径仅3cm;花瓣白色且上面有深紫色斑点，以及唇瓣侧裂片顶端有流苏。  相似文献   

我国C2C市场状况的实证研究   总被引：3，自引：0，他引：3  

周欢怀 《未来与发展》2007,28(11):27-31

本文主要针对CNNC2006年3月对我国C2C市场所作的市场调研报告,分析了我国当前C2C市场的状况和存在问题,并就这些问题提出了解决措施.  相似文献   

藤麻(荨麻科)的一个新异名     

林祁  陈家瑞 《中国科学院研究生院学报》2005,1(1):79-81

根据对Elatostema gagnepainianum H. Schröter模式材料的研究,为它指定了后选模式,并将其处理为藤麻Procris crenata C. B. Robinson的新异名。  相似文献   

安徽铁线莲属一新种     

薛兆文  王学文 《中国科学院研究生院学报》1986,24(5):406-407

  相似文献   

USB接口在数据采集系统中的应用   总被引：2，自引：0，他引：2  

唐祎玲 《科技广场》2005,(12):67-69

通用串行总线（USB）作为一种标准的计算机可以支持快速、双向、同步传输及热插拔，使用灵活、方便。本文介绍了一个USB数据采集系统的设计过程，重点阐述了USB通信接口和USB设备软件设计两个部分。  相似文献   

SPC控制图制作及运用中的注意点     

殷彩红 《黑龙江科技信息》2007,(1):7

随着自动化程度的不断提高,数据的信息量逐渐加大,数据的统计与分析在日常报表中占据重要部分,然而怎样制作合理的控制图来反应数据的信息量,文章从SPC控制图制作中常出现的错误,来强调怎样做好SPC控制图。  相似文献   

广东苏铁及中国东南部几种苏铁的研究     

K. D. 希尔  陈家瑞 《中国科学院研究生院学报》1994,32(6):538-548

本文对华东南(台湾，广东，海南)产的广东苏铁、台东苏铁及海南苏铁的形态学、解剖学和分类学问题、以及这几种苏铁的亲缘关系进行了讨论。本文附有检索表及图。  相似文献   

单片机AT89C52扩展USB接口实现     

廖颀  刘良福  肖士斌 《科技广场》2006,(8):109-110

本文在介绍USB接口基础上,提出一种AT89C52扩展USB接口的实现方法。并指出由于USB接口使用方便、支持热插热拔,AT89C52扩展了USB功能有利于进一步拓展其应用,因而具有广阔的应用前景。  相似文献