Bibliometric maps of field of science   总被引：2，自引：1，他引：2  

Irina Marshakova-Shaikevich 《Information processing & management》2005,41(6):1534-1547

The present paper is devoted to two directions in algorithmic classificatory procedures: the journal co-citation analysis as an example of citation networks and lexical analysis of keywords in the titles and texts. What is common to those approaches is the general idea of normalization of deviations of the observed data from the mathematical expectation. The application of the same formula leads to discovery of statistically significant links between objects (journals in one case, keywords — in the other). The results of the journal co-citation analysis are reflected in tables and map for field “Women’s Studies” and for field “Information Science and Library Science”. An experimental attempt at establishing textual links between words was carried out on two samples from SSCI Data base: (1) EDUCATION and (2) ETHICS. The EDUCATION file included 2180 documents (of which 751 had abstracts); the ETHICS file included 807 documents (289 abstracts). Some examples of the results of this pilot study are given in tabular form . The binary links between words discovered in this way may form triplets or other groups with more than two member words.  相似文献   

Stability and dissipative analysis for a class of stochastic system with time-delay     

Hao Zhang  Huaicheng Yan 《Journal of The Franklin Institute》2010,347(5):882-3355

This paper deals with the stability and dissipative problem of a class of stochastic hybrid system. The system under study involves Markovian jump, impulsive effects and time delay, which are often encountered in practice and are the sources of instability. Our attention is focused on analysis of whether the stochastic hybrid system with time-delay is stochastically asymptotically stable and strictly (Q, S, R) dissipative. By introducing an extra artificial time instance, the equivalent system is obtained and the sufficient conditions are derived by using linear matrix inequality (LMI) techniques. The main results of this paper unify the existing results on H_∞ control.  相似文献   

The expanding role of university patenting in the life sciences: assessing the importance of experience and connectivity     

Jason Owen-Smith 《Research Policy》2003,32(9):1695-1711

We extend debates about the sources of university capabilities at research commercialization. Drawing upon quantitative data for a panel of 89 research-intensive US universities and interview data from two academic licensing offices, we model the relationship between technology transfer experience, embeddedness in biotechnology industry networks, basic science quality and capacity, and citation impact measures of university life science patents. Technology licensing officers draw upon the expertise of corporate partners to evaluate the potential impact of invention disclosures. The information gleaned through network ties to industry enables well-connected institutions to develop higher impact patent portfolios. Reaping the benefits of such connections, however, requires experience in balancing academic and corporate priorities to avoid the danger of ‘capture’ by industrial interests as overly tight connections limit patent impact. This pattern of diminishing returns to connectivity is robust across multiple citation measures of patent quality.  相似文献   

Design of a fast real-time LPV model predictive control system for semi-active suspension control of a full vehicle     

Marcelo Menezes Morato  Manh Quan Nguyen  Olivier Sename  Luc Dugard 《Journal of The Franklin Institute》2019,356(3):1196-1224

This article is concerned with the control of a Semi-Active suspension system of a 7DOF Full Vehicle model, equipped with four Electro Rheological (ER) dampers, taking into account their incipient dissipativity constraints. Herein, a real-time, fast, advanced control structure is presented within the Model Predictive Control framework for Linear Parameter Varying (LPV) systems. The control algorithm is developed to provide a suitable trade-off between comfort and handling performances of the vehicle in a very limited sampling period ($T_s=5\text{ms}$), in view of a possible realtime implementation on a real vehicle. The control structure is tested and compared to other standard fast control approaches. Full nonlinear realistic simulation results illustrate the overall good operation and behaviour of the proposed control approach.  相似文献   

Patenting and US academic research in the 20th century: The world before and after Bayh-Dole   总被引：2，自引：0，他引：2  

Bhaven N. Sampat 《Research Policy》2006,35(6):772-789

The dramatic growth of patenting and licensing of publicly funded research by American research universities in the closing quarter of the 20th century has stimulated some of the highest-profile debates in science and technology policy today. The issue of what aspects of academic research should be public - and what private - lies at the heart of each of these debates. The movement of academic scientists into commercialisation of discoveries and inventions has been extolled by some as a new model of academic research, one which facilitates economic and social returns from universities. At the same time, this trend has been criticised by others as representing a socially inefficient ‘privatisation’ of academic research and as a threat to the ethos of science itself. This paper places these debates in historical context, with a review of changes in American universities’ patenting policies, procedures and practices throughout the 20th century, an assessment of the logic underlying the passage of the Bayh-Dole Act of 1980, and an overview of its effects on economic returns from university research.  相似文献   

我国近年来耕地资源动态变化的区域特征及对策分析   总被引：10，自引：0，他引：10  

陈利顶 《资源科学》1996,18(5):1-8

我国耕地资源的减少已经成为目前面临的主要问题之一，并随着经济的进一步发展，耕地资源减少的现状还将持续下去。本文根据1987-1994年我国耕地面积的总减少、净减少、损失率和变化率分析了耕地动态变化的区域特征，并依次将我国大陆30个省（区）分为不同的类型，提出了不同类(耕地资源、总减少、净  相似文献   

我国各地区农村基础教育财政投入的比较分析   总被引：9，自引：0，他引：9  

李斌 《中国软科学》2004,(9):140-144

本文对于农村基础教育财政投入进行比较分析。用舒尔兹系数、基尼系数等描述并分析全国各地区农村基础教育的财政投入。从公平和效益两个方面比较客观地评价我国农村基础教育的实际。对于分析结果的经济、社会意义给予一种科学的解决,进而对于国家的财政政策、基础教育政策提出建议,为政府有关部门决策提供有益的参考。  相似文献   

在.NET上创建、部署和访问XML Web services     

谢军  李姗  郑超美  江耘  熊炜 《科技广场》2004,(8):16-18

简述了随着Internet的发展而呈现出的不同的平台技术。介绍了Internet新阶段的平台．NET和新一代的分布式计算技术XML Web services，以及如何在．NET上创建、部署和访问XML Web services，  相似文献   

关于科研单位参与市场竞争的几点认识     

刘伟才  何连贵 《科研管理》1996,17(4):53-55

本文就科研单位适应市场经济，实现战略转变，总结了实践经验，讨论了几点认识。提出科研单位不能仅以科技成果转让为目标，应加速发展科技产业；不应仅满足于出成果，而应重视并着力于科技成果的转化，才能在社会主义市场经济条件下实现其价值和形成自我积累、自我发展的能力。  相似文献   

Attendance, schooling quality, and the demand for education of Mexican Americans, African Americans, and non-Hispanic whites     

Marie T. Mora 《Economics of Education Review》1997,16(4):407-418

This study examines the influence of the opportunity costs of school attendance, educational quality attributes, and household socioeconomic status on the educational demand of Mexican Americans, African Americans, and non-Hispanic whites using the 1988–1990 surveys of the National Education Longitudinal Study. Implementing a utility-maximizing framework, educational demand assumes the form of schools' average daily attendance rates and student dropout decisions between the 8th and 10th grades. The basic results suggest that a school's attendance rate is sensitive to educational quality and student characteristics. Moreover, the demand for education measured by student attrition inversely relates to unexplained school attendance, and is positively affected by household socioeconomic status. Some policy recommendations based on the results are discussed.  相似文献