Innovation, regional knowledge spillovers and R&D cooperation     

Michael Fritsch  Grit Franke 《Research Policy》2004,33(2):245-255

We investigate the impact of knowledge spillovers and R&D cooperation on innovation activities in three German regions. We begin by estimating the knowledge-production function in order to test for interregional difference with regard to the efficiency of innovation activities. In a second step, we analyze the contribution of spillovers from R&D effort of other private firms and of public research institutions to explain these differences. The inclusion of variables for R&D cooperation in the model indicates that R&D cooperation is only of relatively minor importance as a medium for knowledge spillover.  相似文献   

The structure and evolution of industrial clusters: Transactions, technology and knowledge spillovers   总被引：2，自引：0，他引：2  

Simona Iammarino  Philip McCann 《Research Policy》2006,35(7):1018-1036

In this paper, we investigate the relationship between location patterns, innovation processes and industrial clusters. In order to do this we extend a transactions costs-based classification into a knowledge-based taxonomy of clusters, along the lines suggested by a critical revision of the main assumptions underlying most of the existing literature on spatial clusters. Our arguments show that the transactions costs approach and the innovation and technological regimes framework are broadly consistent, and that real insights into the microfoundations, nature, and evolution of clusters can be provided by these classification systems.  相似文献   

The impact of cognitive communities on the diffusion of academic knowledge: Evidence from the networks of inventors of a French university     

Caroline Hussler  Patrick Rondé 《Research Policy》2007,36(2):288-302

Looking at micro-data on the networks of inventors of a French science university, we investigate whether the kind of cognitive relationships between researchers influences the geography of their collaborations.The hypothesis we test (and confirm empirically) is that academic knowledge diffuses in a restricted geographic area when the connected researchers belong to epistemic communities, whereas communities of practice entail less localised effects. We also show that institutionally mixed research teams do not impede large knowledge diffusion.  相似文献   

Do University policies make a difference?     

David B. Audretsch  Erik E. Lehmann 《Research Policy》2005,34(3):343-347

The purpose of this paper is to examine whether the technical universities have been more successful in facilitating the spillover and commercialization of knowledge. We compare the impact of technical and general universities on the performance of knowledge-based firms. Based on a unique data set consisting of publicly held high technology firms, the empirical evidence suggests that, in fact, firm performance is not influenced by the type of university. Technical universities do not have a differential impact on firm performance from more general universities.  相似文献   

试述教会学校在绥远地区的演变历程     

丁平 《内蒙古师范大学学报(哲学社会科学版)》2005,34(6):104-106

19世纪末20世纪初,教会学校在绥远地区的兴起和扩张,并非是一种偶然的历史现象,而是西方势力试图以基督教文化征服、改造绥远的历史产物。然其作为西方近代社会的教育模式,传播着西方近代科学文化,不仅造就出大量基督教信徒,也培养出掌握近代科学知识的新型知识分子,因而它在绥远地区近代教育发展史上具有十分特殊的地位和作用。  相似文献   

浅谈java与数据库的存取技术     

徐红梅 《四川职业技术学院学报》2006,16(2):117-118

数据库存取技术在计算机应用系统中涉及很广泛,本文主要阐述了在Java中用使用JDBC访问数据库的方法,连接数据及其主流存取技术。  相似文献   

基于LASSO-LARS的上市公司财务危机预警模型研究     

吴若唯  李凡群  廖国威 《安顺学院学报》2019,(2):130-135

目前,我国企业面临较大的竞争压力与风险。财务风险是影响企业经营的重要因素,故企业需要建立财务危机预警机制,对未来可能发生的风险进行管理和控制。文章从沪深A股市场中选取共80家ST与非ST上市公司的财务指标数据作为样本,运用机器学习LASSO-LARS算法提取样本中的特别变量,并求得特别变量的系数,最终形成上市公司财务危机预警模型,为上市公司决策者提供决策方向。  相似文献   

R(L)型诱导空间及连通性     

刘智斌 《宁夏师范学院学报》2003,24(6):1-6

用R(L)-值下半连续函数引入了R(L)型诱导空间的概念．讨论了它的一些基本性质．证明了R(L)型诱导空间保持笛卡尔积；(L^x，δ)是连通空间当且仅当其R(L)型诱导空间是连通空间，给出了LF拓扑空间集与R(L)型诱导空间集之间建立的映射和生成映射ω的可交换性．  相似文献   

Strengthening reinforced concrete beams using prestressed glass fiber-reinforced polymer-Part II:Analytical study     

HUNG Chien-hsing  YEN Tsong  WU Jong-hwei 《浙江大学学报(A卷英文版)》2005,(8)

INTRODUCTION When the flexural load-carrying capacities of existing R. C. or P. C. structures are not sufficient for the service loads, structural strengthening becomes necessary. Using steel plates to strengthen concrete members is a traditional method (Raithby, 1980) and is still an important and popular way at the present time. Fiber-reinforced polymer (FRP) sheets and plates have been used recently as an alternative to steel plates for strengthening concrete structures be-cause th…  相似文献   

What time-series designs may have to offer educational researchers     

Thomas R. Kratochwill  Joel R. Levin 《Contemporary educational psychology》1978,3(4):273-329

The promise of time-series designs for educational research and evaluation is reviewed. Ten time-series designs are presented and discussed in the context of threats to internal and external validity. The advantages and disadvantages of various visual and statistical data-analysis techniques are presented. It is argued that time-series research paradigms are useful when researchers (a) wish to involve a single subject in experimental research (individuals as units of analysis) or conduct program-evaluation studies (aggregates as units of analysis), (b) are interested in nearly continuous measurement, (c) cannot meet conventional design and statistical assumptions, or (d) wish to specify individual differences through N = 1 research strategies. It is also suggested that more research endeavors be devoted to combining unique characteristics of time-series research with conventional multi-unit paradigms.  相似文献