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聂高辉 《科技广场》2004,(11):55-56
本文对非线性S曲线模型提出了它的一类线性化模型——增长率模型,并指出其参数估计的实现。  相似文献   
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The purpose of this article is to propose a fruitful analytical framework for data supposedly related to the concept of the so-called "digital divide." The extent and the nature of this divide depend on the kind of access defined. Considering the possession of hardware, growing divides among different categories of income, employment, education, age, and ethnicity can be proved to have existed in the 1980s and 1990s according to official American and Dutch statistics. If only by effects of saturation, these gaps will more or less close. However, it is shown that differential access of skills and usage is likely to increase. The growth of a usage gap is projected. Multivariate analyses of Dutch official statistics reveal the striking effect of age and gender as compared to education. The usage gap is related to the evolution of the information and network society. Finally, policy perspectives are discussed.  相似文献   
3.
基于我国制造业上市企业的样本数据,采用DEA和多元回归相结合的方法研究了企业国际化与绩效关系。结果表明,企业国际化程度与绩效呈水平S型曲线,企业技术效率和规模效率对国际化与绩效关系起到显著的正向调节作用。  相似文献   
4.
Many technology studies have conceptualized transitions between technological generations as a series of S-curve performance improvements over time. Surprisingly, the interregnum between successive generations has received little attention. To understand what happens in the interregnum, we study the transition from 2G to 3G in mobile communications. Our study identifies the presence of forces for both change and continuity across heterogeneous social and technical elements shaping an uneven transition between 2G and 3G mobile communications technology platforms. Unanticipated misalignments and asynchronies that emerged during the journey shifted the incentives of the various actors involved to participate. Based on these observations, we offer several conjectures as to the dynamics that can give rise to temporal discords during inter-generational technological transitions.  相似文献   
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我国钢铁工艺技术创新模式   总被引:3,自引:0,他引:3       下载免费PDF全文
  钢铁工业的创新过程是以工艺创新为先导,以装备创新为核心,带动钢铁产品创新的持续创新过程。技术“S”曲线已经成为思考技术创新模式的核心工具。本文首先探讨炼铁工艺技术“S”曲线,然后描述炼钢工艺技术“S”曲线,最后论述“十一五”期间我国钢铁工艺技术创新模式。  相似文献   
6.
3G技术市场快速推广是电信运营商目前需着力解决的现实问题.从技术扩散S曲线出发,通过问卷调查结果,分析论证我国3G技术扩散还处在初期阶段,需要精确定位初期阶段的目标用户并按照其特征来制定推广策略,指出运营商的现有推广策略针对性不强,并在此基础上对这些方案提出改进建议,为3G技术市场的发展提供参考借鉴.  相似文献   
7.
The Digital Divide as a Complex and Dynamic Phenomenon   总被引:9,自引:0,他引:9  
The purpose of this article is to propose a fruitful analytical framework for data supposedly related to the concept of the so-called "digital divide." The extent and the nature of this divide depend on the kind of access defined. Considering the possession of hardware, growing divides among different categories of income, employment, education, age, and ethnicity can be proved to have existed in the 1980s and 1990s according to official American and Dutch statistics. If only by effects of saturation, these gaps will more or less close. However, it is shown that differential access of skills and usage is likely to increase. The growth of a usage gap is projected. Multivariate analyses of Dutch official statistics reveal the striking effect of age and gender as compared to education. The usage gap is related to the evolution of the information and network society. Finally, policy perspectives are discussed.  相似文献   
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