关于网络教学系统的一点认识

信息社会,教育进入了数字化时代,计算机辅助教学,网络教学,名声鹊起,发展迅速.就网络教学而言,网络通信技术、信息处理技术的飞速发展起了极大的推动作用.本文简要叙述网络教学的网络平台,介绍基于MPEG-4、MPEG-7标准和虚拟现实技术在网络教学系统的应用.     

七大联合政府主张的确证

联合政府是抗战胜利前后国共两党谈判的核心问题,也是中共七大的一个政治主张。中共七大提出联合政府主张既不是参加政府,也不是推翻政府,而是要通过改组后的联合政府实现各党派合作建国的愿望,使中国走上和平发展的道路。     

1938年七七献金评析

1938年七七献金是中国共产党在国统区发动的一次最大的献金运动。此次运动对中国抗战产生了广泛和深远的影响。     

论七世纪中后期唐朝与新罗关系演变及对东北亚政局的影响

唐朝与新罗联合灭亡百济、高句丽后,两国合作基础亦不复存在,为争夺对百济和高句丽故地的统治权,唐朝与新罗最终爆发战争。由于唐朝受西北吐蕃炽盛局势的影响,不得不对朝鲜半岛采取退守政策,以后新罗以统一国家面貌出现,七世纪中后期的东北亚政局从此进入和平稳定发展的新时期。     

Conditional inference for subject-specific and marginal agreement: Two families of agreement measures

A two-stage procedure is described for assessing subject-specific and marginal agreement for data from a test-retest reliability study of a binary classification procedure. Subject-specific agreement is parametrized through the log odds ratio, while marginal agreement is reflected by the log ratio of the off-diagonal Poisson means. A family of agreement measures in the interval [-1, 1] is presented for both types of agreement. The conditioning argument described facilitates exact inference. The proposed methodology is demonstrated by way of an example involving hypothetical data chosen for illustrative purposes, and data from a National Health Survey Study (Rogot and Goldberg 1966).     

Non‐dominated Time‐Window Policies in City Distribution

Urban freight contributes significantly to pollution, noise disturbance, traffic congestion, and safety problems in city centers. In many cities, local governments have introduced policy measures, in particular time‐access restrictions, to alleviate these problems. However, setting time windows is very challenging due to the conflicting interests and objectives of the stakeholders involved. In this article, we examine whether it is possible to develop time‐window policies that enhance environmental sustainability and distribution efficiencies, while meeting the objectives of the municipalities. We develop a framework for balancing retailer (costs), municipality (satisfaction), and environmental (emissions) objectives, using data envelopment analysis, under different urban time‐window policies. The approach is illustrated by a case study of three Dutch retail organizations, with a large number of stores affected by such time windows. On the basis of an evaluation of 99 different time‐window policies, our results show that harmonizing time windows between neighboring cities leads to the best overall performance. The currently used time‐window policy appears to perform reasonably well, but can be improved on all dimensions . However, harmonizing time‐window policies may be difficult to realize in practice.     

WEF全球竞争力评价体系下中美国家制度竞争力比较研究——基于WEF数据的实证分析

中国国家竞争力的提升与35年来改革开放即制度建设密不可分。改革极大地改变了我国宏观制度环境,也是促进我国制度竞争力提升进而提高我国国家竞争力水平的重要因素。文章以国家竞争力理论为基础,基于WEF建立的全球竞争力评价体系和相关数据,在对比分析中美制度竞争力发展现状和历史回顾的基础上,运用灰色关联度方法进一步对影响中美两国制度竞争力各因素的强弱、大小和次序进行实证分析,发现中国不仅在私人制度竞争力方面与美国相比差距明显,而且影响两国制度竞争力各因素的关联度也存在明显差异。     

Do greater amounts of FDI cause higher pollution levels? Evidence from OECD countries

Using an ARDL model for a panel of 15 OECD countries, this work analyses the impact that FDI, both jointly and by sector, has on CO₂ emissions. The findings reveal that these countries are yielding to the pressure on the trade sector. Unexpectedly, gross fixed capital formation shrink pollution, excluding in the mining sector. With findings supporting the Pollution Haven Hypothesis, policymakers must pay attention to FDI inflows, ensuring that FDI place high importance on the transfer of green technologies to improve the efficiency. These goals could be achieved through an increase in the stringency of environmental laws within the host countries, especially the ones related to FDI.     

有效应对公共危机事件的范式探析——以“7·5”事件为例

近年来我国公共危机事件频频发生,传统的范式又难以发挥有效作用,应对危机的效率以及效果难免受到影响。通过借鉴以往应对公共危机事件的应对范式,结合乌鲁木齐＂7.5＂事件,从微观领域针对有效应对公共危机范式的建构进行初步探讨,以致力于危机管理能力的提升。     

A note on Läuter-type robust design for polynomial regression models

In this paper, we consider the problem of model robust design for simultaneous parameter estimation among a class of polynomial regression models with degree up to k. A generalized D-optimality criterion, the Ψ_α‐optimality criterion, first introduced by Läuter (1974) is considered for this problem. By applying the theory of canonical moments and the technique of maximin principle, we derive a model robust optimal design in the sense of having highest minimum Ψ_α‐efficiency. Numerical comparison indicates that the proposed design has remarkable performance for parameter estimation in all of the considered rival models.