Relative efficiency of R&D activities: A cross-country study accounting for environmental factors in the DEA approach   总被引：1，自引：0，他引：1  

Eric C. Wang  Weichiao Huang 《Research Policy》2007,36(2):260-273

This paper applies the production framework associated with the data envelopment analysis (DEA) method to evaluate the relative efficiency of R&D activities across countries. R&D capital stocks and manpower are treated as inputs while patents and academic publications are considered as outputs. A three-stage approach, which involves using DEA for evaluating efficiency and using Tobit regressions for controlling the external environment, is applied to 30 countries in recent years. The results show that less than one-half of the countries are fully efficient in R&D activities and that more than two-thirds are at the stage of increasing returns to scale. Most countries have a more significant advantage in producing SCI cum EI publications than in generating patents.  相似文献   

APRIRIO算法的扩展算法的提出     

吴文兵  杨淑群  聂承启 《科技广场》2005,(8):67-68

进行数据处理的时候，总希望能在繁杂的海量数据中挖掘出有用的信息，因此就有了各种数据挖掘方法的产生，本文介绍一种APRIRIO算法的扩展算法，这种方法能够在众多数据中挖掘出反面规则来，从而得到更清晰的数据概念，方便得出更有用的信息。  相似文献   

基于MATLAB的数据线性化变换   总被引：1，自引：0，他引：1  

唐家德 《科技广场》2007,(5):44-48

在许多实际问题中,变量之间的关系并不简单地呈线性关系,但是许多曲线可以通过变换化为直线。本文应用MATLAB曲线拟合工具箱,探讨了曲线拟合中数据线性化的方法和步骤,分析了数据线性化变换的一般规律,介绍了上机求解拟合曲线的程序。  相似文献   

基于B/S模式的海量数据报表的实现     

阚洪亮  韩中华  郑君刚  石娜 《科技广场》2007,(5):60-62

本文基于海量数据和网络打印速度之间的矛盾问题,通过几种报表实施方案的对比,提出了利用操纵Excel引擎方式解决网络打印海量数据报表问题的方法。以某煤矿企业考勤综合管理系统的考勤报表为应用背景,研究了基于B/S模式的海量数据报表的实现过程,讨论了客户端与服务器端的设置方式。应用证明该方法切实可行,可以有效地解决网络打印海量数据报表效率低的问题。  相似文献   

New Media/Internet Research Topics of the Association of Internet Researchers     

Ronald E. Rice 《The Information Society》2005,21(4):285-299

This study summarizes prior reviews of new media and Internet research, and the growth of the term Internet in academic publications and online newsgroups. It then uses semantic network analysis to summarize the interests and concepts of an interdisciplinary group of Internet researchers, as represented by session titles and paper titles and abstracts from the 2003 and 2004 Association of Internet Researchers conferences. In both years, the most frequent words appearing in the paper abstracts included Internet, online, community, social, technology, and research. The 2003 papers emphasized topics such as the social analysis/research of online/Internet communication, community, and information, with particular coverage of access, individuals, groups, digital media, culture; role and process in e-organizations; and world development. The 2004 papers emphasized topics such as access; news and social issues; the role of individuals in communities; user-based studies; usage data; and blogs, women, and search policy, among others.  相似文献   

XML数据在浏览器端的动态关联显示处理研究     

何莹莹 《科技广场》2006,(1):10-12

  相似文献   

虚拟仪器中波形动态显示与丢点的矛盾     

陈朝霞 《科技广场》2006,(1):13-14

虚拟仪器开发中,采集数据的完整性至关重要,丢点现象是虚拟仪器的致命缺点。本文解释了由于波形动态显示而导致丢点现象的原因,并提出了解决波形动态显示与信号完整性的矛盾的方法。  相似文献   

Gaps and Bits: Conceptualizing Measurements for Digital Divide/s   总被引：1，自引：0，他引：1  

Karine Barzilai-Nahon 《The Information Society》2006,22(5):269-278

Three arguments are raised in this article with regard to the indices used to measure the digital divide. First, I criticize policymakers who rely on simplistic measures of the digital divide, at the expense of a thoughtful analysis of (1) the purpose of the tool, (2) the level of observation, and (3) the method of approaching the data. Second, I argue that networks and associated technologies are not neutral artifacts but are political and social spaces in their structure as well as in their content levels. Accordingly, we need to factor in the context as an important actor in conceptualizing and measuring the digital divide. Third, two general types of indices are used for the measurement of the digital divide(s): focused monotopical indices and comprehensive indices. Monotopical indices are more widely available, while comprehensive ones are rare. I argue that policymakers need to promote comprehensive indices over monotopical indices. Finally, I present a conceptual definition of the digital divide and a framework for developing a comprehensive index to measure it.  相似文献   

基于GML和空间数据仓库技术的GIG数据共享模式研究     

陈玮  冷丽  刘娟 《科技广场》2007,(7):84-86

传统的GIS系统缺乏统一的数据格式标准,不同应用系统之间由于文件存储格式不同而无法实现直接数据共享。空间数据仓库技术可以实现GIS数据存储的统一标准化和应用的深层化,而GML的空间数据转换技术可实现Web环境下GIS数据的高速传输和共享。在对现有GIS数据共享方案及其中的各种数据共享模式进行分析的基础上,指出其中的不足之处,然后提出了面向管理的GIS数据共享模式,并就其实施模式和特点进行了研究。  相似文献   

中外在线档案资源获取比较分析   总被引：2，自引：0，他引：2  

邓君  王强 《情报科学》2007,25(2):221-225

通过对国内外代表性档案网站的调查,对国内外在线档案资源获取进行了综合性比较。从档案网站主要内容、政府文件获取途径、站内信息检索方式以及档案资源获取权限设置等方面进行了共性分析;从档案资源获取模式、提供全文获取能力与档案资源丰富性以及辅助检索功能设置等方面进行了差异性分析,指出我国在线资源获取存在的问题与不足,有针对性地提出今后在线档案资源开发与获取的发展对策。  相似文献