自适应运动矢量精度在插值算法中的应用

根据对H.26L视频图像编码算法的研究,提出了一些新的有效的编码方法.在运动估值和运动补偿方面,采用立方卷积插值算法替代双线性插值以获得更高的估值精度,并提出混合插值与自适应运动矢量精度(AMVA)相结合的算法,着重就平均峰值信噪比、压缩效率和主观图像质量做了分析和比较.从实验结果看,算法获得了满意的效果,实现的H.26L软件编解码器在压缩比方面较H.263软件编解码器有明显提高,具有较大的实用价值.相信所做的工作对甚低码率视频图像编码的实际应用和推广将起到一定作用.     

Toward a taxonomy of entrepreneurship education research literature: A bibliometric mapping and visualization

The retrospective amount of research literature dedicated to entrepreneurship education (EE) is overwhelming, which makes producing an overview difficult. However, advanced bibliometric mapping and clustering techniques can help visualize and structure complex research literature. Thus, the objective of this mapping study is to systematically explore and cluster the EE research literature to deliver a taxonomic scheme that can serve as a basis for future research. The analyzed data, which were drawn from the Web of Science and Scopus, consist of 1773 peer-reviewed documents published between 1975 and 2014. On the one hand, this taxonomy should create stronger ties to educational research; on the other, it can foster international research collaboration to boost both interdisciplinary EE and its impact on a global basis. This work reinforces our understanding of current EE research by identifying and distilling the most powerful intellectual relationships among its contributions and contributors. Consequently, this study addresses not only the academic community but also entrepreneurship educators and policymakers in an effort to boost entrepreneurial spirit, design effective policy instruments, and, ultimately, improve societal welfare.     

一种机载重轨InSAR高精度三维定位方法

在重轨干涉实际测量中,两次飞行航迹难以保持高度重合,飞行高度和姿态不稳定,干涉图像对存在明显不规则的相对形变,难以进行三维定位。通过分析重轨机载InSAR图像对的几何形变和形成原因,提出一种从精准的InSAR成像几何关系出发,通过修正成像参数,实现机载重轨InSAR高精度三维定位的方法。该方法通过引入地面控制点,实现干涉图像对精准的相对定位,生成高精度DEM;并利用高精度DEM,实现机载重轨InSAR高精度三维定位。对比检查点实测结果和定位结果,表明该方法可有效地解决机载重轨InSAR的三维定位困难的问题。     

Cooperative R&D and firm performance

We analyse the impact of R&D cooperation on firm performance differentiating between four types of R&D partners (competitors, suppliers, customers, and universities and research institutes), and considering two performance measures: labour productivity and productivity in innovative (new to the market) sales. Using data on a large sample of Dutch innovating firms in two waves of the Community Innovation Survey (1996, 1998), we examine the impact of R&D cooperation in 1996 on subsequent productivity growth in 1996–1998. The results confirm a major heterogeneity in the rationales and goals of R&D cooperation. Competitor and supplier cooperation focus on incremental innovations, improving the productivity performance of firms. University cooperation and again competitor cooperation are instrumental in creating innovations generating sales of products that are novel to the market, improving the growth performance of firms. Furthermore, customers and universities are important sources of knowledge for firms pursuing radical innovations, which facilitate growth in innovative sales in the absence of formal R&D cooperation.     

The discrete charm of the bourgeoisie: quantum and continuous perspectives on innovation and growth

This paper discusses the relative merits of discrete versus continuous perspectives on innovation, technical change, and economic growth. It discusses the innovation time series literature in some detail to extract the continuous and clustering properties of the historical record on innovation. It then proposes a mosaic/avalanche model based on percolation theory and self-organized criticality to address this question.     

The ex ante assessment of knowledge spillovers: Government R&D policy, economic incentives and private firm behavior

This paper investigates the role of government R&D subsidy programs in stimulating knowledge spillovers. R&D subsidies are an effective public policy instrument when knowledge spillovers exist yet ex ante it is difficult to identify projects that have the greatest potential to increase innovation and economic growth. This paper derives a set of project and firm attributes that the literature finds generate knowledge spillovers and uses data on project proposals to estimate the degree to which a government R&D program conforms. We find that projects that were awarded R&D subsidies were more likely to have attributes such as participation in new research joint ventures and connections to universities and other firms. Following the post-award activities of firm, we find that receipt of a government R&D subsidy increased the funding from other sources when compared to firms that were not awarded funding.     

第26届男篮亚锦赛攻防能力解析

运用文献资料法、录像观察法、数理统计法、比较分析等方法,以参加第26届亚洲男篮锦标赛的中国男子篮球队为主要研究对象,研究结果发现:中国男篮在身高指标上已经达到世界优秀球队水平,体重高于亚洲平均水平;进攻能力方面:中国队进攻篮板、助攻能力方面明显强于预赛对手,被犯规次数、失误与对手相当;防守能力方面:中国队防守篮板、抢断能力、封盖能力优于亚洲其它球队,犯规能力与其它球队相当。提出对策和建议,希望为中国队备战伦敦奥运会提供理论参考,为中国队今后训练所用。     

基于MTK平台的RFID射频手持设备的设计

提出一种基于MTK手机平台的RFID射频手持设备的设计方案．系统以MTK手机平台为主体,外部扩展RFID射频模块,MTK手机平台以MT6255为核心处理单元;RFID模块采用STC89LE516RD作为独立CPU控制,使用MFRC500对射频卡进行读写,通过UART接口将数据送入MTK平台处理．本方案采用外部扩展模块的设计思想,对RFID模块电路及其接口进行了硬件电路设计,对RFID模块和MTK手机平台进行了程序设计,可以完成对射频卡的读写,可对射频卡上的数据进行重置、加减等处理,具有一定的应用价值．     

Academic spin-off’s transfer speed—Analyzing the time from leaving university to venture

For academic spin-offs I analyze the length of the time period between the founder’s leaving of academia and the establishment of her firm. A duration analysis reveals that a longer time-lag is caused by the necessity of assembling complementary skills, either by acquisition by a single founder or by searching for suitable team members. Furthermore, new ventures are established faster if there has been high-level technology transfer, if the founders have access to university infrastructure, or if they receive informal support by former colleagues.