我国移动通信发展现状

2012²013年,3G、4G竞相争辉,我国移动通信事业的发展即将迎来再一次的飞跃.文章分析我国3G、4G的发展现状,剖析当前3G、4G网络发展存在的问题,说明3G与4G的相互关系和发展的趋势,最后对4G发展作出展望.     

University licensing and the flow of scientific knowledge

As university involvement in technology transfer and entrepreneurship has increased, concerns over the patenting and licensing of scientific discoveries have grown. This paper examines the effect that the licensing of academic patents has on journal citations to academic publications covering the same scientific research. We analyze data on invention disclosures, patents, and licenses from the University of California, a leading U.S. academic patenter and licensor, between 1997 and 2007. We also develop a novel “inventor-based” maximum-likelihood matching technique to automate and generalize Murray's (2002) “patent-paper pairs” methodology. We use this methodology to identify the scientific publications associated with University of California patents and licenses.Based on a “difference-in-differences” analysis, we find that within our sample of patented academic discoveries, citations to licensed patent-linked publications are higher in the three years after the license, although this difference is not statistically significant. We then disaggregate our sample into (a) patented discoveries that are likely to be used as “research tools” by other researchers (based on the presence of material transfer agreements (MTAs) that cover them) and (b) patented discoveries not covered by MTAs. Citations to publications linked to licensed patents in the latter subset (not covered by MTAs) are higher for publications linked to licensed patents, and this difference is statistically significant. In contrast, licensing of patented discoveries that are also research tools is associated with a reduction in citations to papers linked to these research advances, raising the possibility that licensing may restrict the flow of inputs to “follow-on” scientific research.     

"反思实践"思想及其在教师教育中的争议--来自舍恩、舒尔曼和范斯特马切尔的争论

本文在陈述舍恩的以"反思实践"为根基的教师教育思想的基础上,展示了西方教师教育领域围绕这一概念所展开的争议,指出这种争论有利于深化教师教育的学理探讨,有助于教师教育实践的健康发展.     

实现Authorware与MCS-51系列单片机的多机通讯

通过实例详细介绍了Authorware与单片机进行多机通讯的原理和方法，既有硬件原理图，又有程序清单，具有一定的实用价值．     

PXE在高校机房中的应用

结合GhostCast Server和Tftpd32程序,讨论PXE工作原理,实现基于PXE的网络克隆的功能.     

A comparative evaluation of regional subsidies for collaborative and individual R&D in small and medium-sized enterprises

We analyse whether public subsidies supporting collaborative research and development (R&D) projects in small and medium-sized enterprises (SMEs) are able to encourage persistent R&D investment and interorganisational networking more than subsidies supporting individual R&D projects. Adopting a counterfactual approach to policy evaluation, we compare subsidies for collaborative R&D and for individual R&D implemented in the same Italian region in the same period. Our findings suggest that, once public support is no longer available, the two subsidies have different effects on different types of SMEs. If the policymakers’ objective is to increase the number of R&D-performing SMEs over time, they should provide subsidies for collaborative R&D to firms with modest R&D experience. If their objective is to increase the amount of spontaneous R&D investment over time, they should target SMEs with some prior R&D experience, using either subsidy. Finally, if their objective is to induce SMEs to network with external organisations, subsidies for collaborative R&D projects should be preferred to subsidies for individual R&D projects.     

新兴技术生命周期中的“峡谷”跨越——3G技术的市场发展研究

 基于技术采用生命周期研究中的技术“峡谷”概念及特征,以及“峡谷”跨越的相关理论,对通过官方统计及问卷调查获取的数据进行分析,论证我国3G技术在目前的市场应用过程中正面临着“峡谷”跨越问题,并通过对3G技术潜在使用者的心理特征的分析,说明他们与“峡谷”对岸的消费者——实用主义者相一致,跨越3G技术“峡谷”的关键是找准实用主义者心理特征的影响因素并制定相应策略,在此基础上为电信企业提出了对策建议,以期为3G技术的市场发展提供参考借鉴。     

基于WiMAX和Wi-Fi以及3G网络融合技术的研究

文章在分析ViMAX技术特点的基础上,结合现有的Wi-Fi和3G网络各自的特点,给出了相应的混合组网模式,融合三网各自的技术优势,将更有利于宽带无线业务的发展。     

PDA设备的串行通信程序设计

讨论了基于WindowsCE的PDA设备串行通信程序的设计方法 ,介绍了与串行通信有关的部分Win32API函数 ,并给出具体的例子描述怎样使用API函数对串口进行操作