Software for Learning and for Doing Statistics

The community of statisticians and statistics educators should take responsibility for the evaluation and improvement of software quality from the perspective of education. The paper will develop a perspective, an ideal system of requirements to critically evaluate existing software and to produce future software more adequate both for learning and doing statistics in introductory courses. Different kinds of tools and microworlds are needed. After discussing general requirements for such programs, a prototypical ideal software system will be presented in detail. It will be illustrated how such a system could be used to construct learning environments and to support elementary data analysis with exploratory working style.     

论生态经济系统稳态

本文论述了生态经济系统非平衡稳定态的概念、特性及其实现的途径。指出生态经济系统稳态,是非平衡的,对外全面开放、激烈竞争、充分利用涨落作用,对内协同、有序、自组织、自适应、自催化、且有非线性作用和支配性、良性运转、进展演替的耗散结构状态。生态经济系统平衡的提法应被生态经济系统稳态的概念所取代。     

精馏过程的节能和优化设计的探讨

精馏过程的节能,对于减少能源消耗,降低生产成本和保护环境具有十分重要的意义.在精馏过程中可以采用最适宜回流比操作和最佳进料状态,使用中间冷凝器和中间再沸器,高效精馏、热泵精馏.合理安排多组分物料分离流程,直接利用过程热量及开发应用高效换热器等措施.本文从最佳回流比R的选择、进料温度及进料状态的确定等方面,详细的分析了在精馏塔的设计过程中,如何实现设计的优化问题,以实现节能降耗.     

东部地区农业结构变动与政策变量之间的相关性研究

本文通过农民收入变量、农民受教育程度、农村人均固定资产投资额、政府用于农村人均文教娱乐用品及服务支出和政府用于农村财政支出等政策变量与东部地区农业结构变动的相关性分析,再根据未来若干年我国及东部地区农业政策变化趋势,从而预测未来我国东部地区农业结构的变化趋势。     

Learning in Design and Technology: The Impact of Social and Cultural Influences on Modelling

The paper introduces the highly problematic nature of modelling in design and technology education and examines the relationship between cognitive and concrete modelling. Its aim is to gain insight into what learners do, rather than what others say they ought to do in their learning activities. The variety of purposes that educators have for learners’ modelling are discussed through examining the contested curriculum justification for design and technology education itself. The paper proposes that learners’ modelling cannot be extracted from the social milieu in which they act and it provides some insights of these social influences through the analysis of two case studies. Their settings are a girls’ secondary school and a college of higher education. Each case study is presented independently but organised with a common format to consider a) the impact of assessment on learning intentions and outcomes; b) cultural influences on learning and modelling; c) social influences on learning and modelling. A discussion of the emergent themes considers implications for teachers. This revised version was published online in July 2006 with corrections to the Cover Date.     

技术站运输分析管理信息系统设计

在对我国铁路技术站运输分析手段和管理信息资源进行分析的基础上,提出技术站运输分析管理信息系统的设计,充分利用和整合技术站铁路运输管理信息系统(TMIS)和办公自动化网络等信息资源,实现统计工作自动化、分析工作网络化和车站作业组织的动态模拟,准确、即时地分析车站运输生产情况,挖掘潜能,为决策提供适时、可靠的依据,适应运输市场的快速变化。     

QUADRATIC TERM STRUCTURE MODELS FOR RISK-FREE AND DEFAULTABLE RATES

In this paper, quadratic term structure models (QTSMs) are analyzed and characterized in a general Markovian setting. The primary motivation for this work is to find a useful extension of the traditional QTSM, which is based on an Ornstein–Uhlenbeck (OU) state process, while maintaining the analytical tractability of the model. To accomplish this, the class of quadratic processes, consisting of those Markov state processes that yield QTSM, is introduced. The main result states that OU processes are the only conservative quadratic processes. In general, however, a quadratic potential can be added to allow QTSMs to model default risk. It is further shown that the exponent functions that are inherent in the definition of the quadratic property can be determined by a system of Riccati equations with a unique admissible parameter set. The implications of these results for modeling the term structure of risk-free and defaultable rates are discussed.     

WebGIS技术在物流配送系统中的应用

万维网地理信息系统（WebGIS)是Internet技术和地理信息系统技术相结合的产物。在分析WebGIS实现技术的基础上，探讨了基于WebGIS的物流配送系统设计，提出了一个以SuperMap IS平台为基础，基于组件和Java Applet技术，利用ASP来实现界面的显示和交互，体现Brower/Serser三层体系结构的系统解决方案。     

Construct measurement in strategic management research: illusion or reality?

Strategic management research has been characterized as placing less emphasis on construct measurement than other management subfields. In this work, we document the state of the art of measurement in strategic management research, and discuss the implications for interpreting the results of research in this field. To assess the breadth of measurement issues in the discipline, we conducted a content analysis of empirical strategic management articles published in leading journals in the period of 1998–2000. We found that few studies discuss reliability and validity issues, and empirical research in the field commonly relies on single‐indicator measures. Additionally, studies rarely address the problems of attenuation due to measurement error. We close with a discussion of the implications for future research and for interpreting prior work in strategic management. Copyright © 2004 John Wiley & Sons, Ltd.     

日本泡沫经济制度性原因分析及启示

20世纪90年代被称为日本经济“失去的10年”。日本经济一蹶不振,丧失了整整10年的发展。不少学者认为,90年代日本经济萧条意味着日本“又一次战败”即在经济战场上的“战败”。日本经济战败是败在了“制度”或“体制”方面,败给了成功地实行了“制度创新”或“体制创新”的美国。分析引发日本泡沫经济的制度性原因、探索日本经济走出衰退的途径,从中可寻找出对我国经济发展的有益启示。