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通过对知识函数、内生增长理论的研究,建立衡量高技术产业创新型的基本模型,将专利申请量、新产品产值和技术进步效率三个指标作为被解释变量衡量高技术产业的创新性.结果显示,在专利申请量和新产品产值作两个创新指标均显示研发费用与创新呈正向关系,新产品产值作为创新指标的情况下,FDI投入与正向影响创新性.专利申请量作为创新指标需限定范围后方能考查人力资本投入与FDI投入情况,技术进步效率不能被该模型解释. 相似文献
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Vasja Vehovar Pavle Sicherl Tobias Hüsing Vesna Dolnicar 《The Information Society》2013,29(5):279-290
The term “digital divide” has been used for almost a decade and typically relates to sociodemographic differences in the use of information and communication technology. However, the corresponding measurement is still relatively imprecise. Very often it is simply reduced to comparisons of Internet penetration rates. This article extends the measurements above the usual bivariate comparisons. Within this context, three essential approaches are presented and critically evaluated. First, loglinear modeling is used to address the interactions among the factors affecting the digital divide. Second, compound measures (i.e., the Digital Divide Index) that integrate a number of variables into a single indicator are discussed. Third, time-distance methodology is applied to analyze changes in the digital divide. The article argues that these approaches often yield entirely different conclusions compared to simple bivariate analysis. The examples are presented as a general warning against an oversimplified methodological approach to digital divide studies. 相似文献
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蒙古高原受自然与人为因素影响,生态环境面临严峻压力,研究气候变化特征及气候模式评估对该地区气候及生态环境等相关研究具有重要的参考意义。本研究以整个蒙古高原为研究区,研究蒙古高原气温与降水要素的变化趋势,对比研究中国内蒙古自治区与蒙古国地区气候变化特征,并评价了全球耦合模式比较计划第五阶段（CMIP5）模式输出的气温与降水序列在研究区的表现,利用一种改进的秩评分方法对CMIP5模式的模拟能力进行了综合评价。结果表明,蒙古高原过去几十年整体呈增温减湿的趋势,最低气温升温幅度明显大于最高气温升温幅度,中国内蒙古地区变暖趋势强于蒙古国地区;CMIP5模式模拟的平均气温普遍偏低,且低估了该区域的增温趋势,而模拟的降水量普遍偏高。不同要素间,CMIP5模式对平均气温的模拟能力最强,最高与最低气温次之,降水相对较差。模式评价结果对评价指标有较大的依赖性,因此,评估气候模式的区域效果时,建议使用多指标进行综合评价。 相似文献
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基于EC-EGARCH-M模型的沪深股市波动性研究 总被引：1，自引：0，他引：1
构建市场活跃度指数,并与上证综指和深证综指之间的协整残差项一起作为解释变量引入条件均值方程和条件方差方程,建立双元EC-EGARCH-M模型。利用上证综指和深证综指的日收盘数据进行实证分析,得到的主要结论为:市场活跃度指数和协整残差项对条件均值方程和条件方差方程有很好的解释力;两市之间存在双向波动溢出,并都呈现出波动的集聚性和非对称性特征。 相似文献
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We report a new Cretaceous multituberculate mammal with 3D auditory bones preserved. Along with other fossil and extant mammals, the unequivocal auditory bones display features potentially representing ancestral phenotypes of the mammalian middle ear. These phenotypes show that the ectotympanic and the malleus-incus complex changed notably during their retreating from the dentary at various evolutionary stages and suggest convergent evolution of some features to extant mammals. In contrast, the incudomalleolar joint was conservative in having a braced hinge configuration, which narrows the morphological gap between the quadroarticular jaw joint of non-mammalian cynodonts and the incudomalleolar articulations of extant mammals. The saddle-shaped and abutting malleus-incus complexes in therians and monotremes, respectively, could have evolved from the braced hinge joint independently. The evolutionary changes recorded in the Mesozoic mammals are largely consistent with the middle ear morphogenesis during the ontogeny of extant mammals, supporting the relation between evolution and development. 相似文献
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为研究科技创新的地区差距和影响因素,给政府决策提供参考。本文选取R&D经费、R&D人员全时当量、信息资源作为投入变量,论文、专利、技术市场成交额等7个科技产出指标经TOPSIS评价后作为产出变量,基于面板数据采用岭回归分析科技投入产出之间的关系,然后分析科技投入产出的地区差距及其变化。研究结果表明,R&D研发人员对科技产出的贡献最大,其次是R&D研发经费,信息资源的贡献最小。近年来,中国科技创新的地区差距虽然有所波动,但总体维持不变。R&D经费的地区差距基本不变,但由于R&D人员全时当量变化的地区差距拉大,从而稀释了信息资源地区差距缩小对减少地区科技产出差距的效果。 相似文献
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Methodological Challenges of Digital Divide Measurements 总被引：1，自引：0，他引：1
Vasja Vehovar Pavle Sicherl Tobias Hü sing Vesna Dolnicar 《The Information Society》2006,22(5):279-290
The term “digital divide” has been used for almost a decade and typically relates to sociodemographic differences in the use of information and communication technology. However, the corresponding measurement is still relatively imprecise. Very often it is simply reduced to comparisons of Internet penetration rates. This article extends the measurements above the usual bivariate comparisons. Within this context, three essential approaches are presented and critically evaluated. First, loglinear modeling is used to address the interactions among the factors affecting the digital divide. Second, compound measures (i.e., the Digital Divide Index) that integrate a number of variables into a single indicator are discussed. Third, time-distance methodology is applied to analyze changes in the digital divide. The article argues that these approaches often yield entirely different conclusions compared to simple bivariate analysis. The examples are presented as a general warning against an oversimplified methodological approach to digital divide studies. 相似文献
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本文提出了一种基于知识网络的技术预见方法。以2011-2015年间的1101项与纳米技术相关的专利数据为例,以专利所包含知识的组合潜力、组合机会、多样性和独特性为指标,使用K均值聚类法把专利聚成两类。通过对组合潜力、组合机会、多样性和独特性高的一类专利的内容分析,挖掘出纳米技术研究的热门领域和发展趋势。以2017年的纳米技术相关专利数据验证了该方法的有效性。 相似文献
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在相关研究的基础上,将营销创新作为中介变量,将环境作为调节变量,并将营销创新划分为渐进式营销创新和突破式营销创新,构建了公司创业导向对组织绩效影响的概念模型,并以中东部八省市242家企业为样本进行了实证检验.研究发现,公司创业导向对组织绩效有正向积极影响,突破式营销创新在其间发挥了完全的中介作用,且环境在其中起着调节作用,而渐进式营销创新却没有发挥中介作用.该结论进一步丰富了创业导向理论,为企业创业导向的实施提供了一种新思路.
相似文献
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选取的沪深两市2009年68家上市公司进行实证研究。并且针股权分置改革之后对上市公司的股权价值的进行讨论。选取13个财务指标进行分析,选取5个为主要的解释变量,建立logistic回归模型。并且将logistic回归模型与KMV模型进行结合,通过实证分析发现,混合模型能取得更好的评价结果。 相似文献
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[目的/意义]期刊学术影响力是学术界和期刊界关注的热点,已有许多学者对其测度指标结构关系进行了分析,但缺少从整体上对测度指标间相互作用关系的研究。[方法/过程]以632种"综合性人文、社会科学"类期刊为研究样本,构建期刊学术影响力的测度指标体系,运用BP神经网络DEMATEL模型计算各测度指标的中心度与原因度,并结合原因—结果图分析各测度指标的重要性及相互作用关系。[结果/结论]研究结果表明,该模型能较准确地反映出测度指标间的结构关系,他引影响因子和复合总被引为强驱动型指标;平均引文数和影响因子是排名前两位的驱动型指标;5年影响因子为最显著的特征型指标。 相似文献
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This study contributes to the extant literature on information management by investigating the interrelationships between information systems (IS)-related capabilities and their effects on firm performance. Using the resource-based view (RBV), a set of hypotheses is formulated to examine these links, considering the role that may be played by decision-making performance and business-process performance as mediating variables. Structural equation modeling (SEM) has been applied to a sample of 204 firms in Turkey. The test results obtained confirm the proposed serially mediating model according to which decision-making performance and business-process performance play a critical mediating role in the human resource and administrative-related IS capabilities, and firm-performance relationships. No support, however, has been found concerning the serial mediation effect between infrastructure-related IS capabilities and firm performance. 相似文献
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Pavle Sicherl 《The Information Society》2019,35(3):143-157
Simultaneous two-dimensional comparisons of time series data—vertically (static difference) and horizontally (Sicherl-time-distance)—for numerous ITU and Eurostat datasets show that estimates of the magnitude of digital divide can differ substantially between conventional static measures and Sicherl-time-distance, a dynamic measure of disparity. Comparing digital divide indicators with other indicators of social inequality (life expectancy, infant mortality), the analysis shows that high ICT growth rate improved well-being in developing countries and reduced some world inequalities. This methodology enables researchers, policy makers, and business managers how to draw new insights from existing data, including monitoring the attainment of targets. 相似文献
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我国数字鸿沟的社会效应分析 总被引：3，自引：0，他引：3
数字技术在给我们带来诸多便利的同时,也带来了新的不平等和新的社会分化,这就是数字鸿沟.数字鸿沟对社会产生的影响即是数字鸿沟的社会效应.教育鸿沟、性别鸿沟、城乡鸿沟是其3个主要方面.直接影响着经济社会的和谐发展. 相似文献
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综合指数评价法与科技文献计量指标——中国高校科技文献统计比较 总被引：2，自引：0，他引：2
科技文献计量指标从评价期刊入手,评价期刊的指标来自该刊全部论文的统计数据,因此评价期刊的质量指标值——“综合指数”,也是该刊论文的平均指标值,采用“综合指数”作为科技文献的计量指标,可以反映科技文献的质量水平。 相似文献