我国城市交通可持续发展初探

本文首先给出了城市交通发展与城市交通环境影响互动机理的计算公式 ,在此基础上提出了城市交通环境损害治理的完整逻辑体系 ,然后结合我国的实际情况 ,从环境经济与技术经济的角度出发 ,就我国城市交通的可持续发展发表了相关看法。     

网络化的课程CAI设计开发

介绍素质教育带给教育改革和课程改革巨大影响的基础上 ,详细地论述网络课程设计与开发的意义、基本过程及关键环节 ,文章认为具备了易用性、高效性、专业性及可扩充性等特点的网络课程对于实现自主创新性教育有极大的推进作用。     

数字图书馆的属性范畴及相关词义分析

分析了数字图书馆的本质属性 ,认为具有图书馆功能 ,以比特做为信息资源的载体是数字图书馆的基本特征 ,在此基础上给出简明定义。同时讨论数字图书馆的类型、范围以及同电子图书馆、网上图书馆、虚拟图书馆等相关词义的联系与区别。     

ELICITING A DIRECTED ACYCLIC GRAPH FOR A MULTIVARIATE TIME SERIES OF VEHICLE COUNTS IN A TRAFFIC NETWORK

The problem of modelling multivariate time series of vehicle counts in traffic networks is considered. It is proposed to use a model called the linear multiregression dynamic model (LMDM). The LMDM is a multivariate Bayesian dynamic model which uses any conditional independence and causal structure across the time series to break down the complex multivariate model into simpler univariate dynamic linear models. The conditional independence and causal structure in the time series can be represented by a directed acyclic graph (DAG). The DAG not only gives a useful pictorial representation of the multivariate structure, but it is also used to build the LMDM. Therefore, eliciting a DAG which gives a realistic representation of the series is a crucial part of the modelling process. A DAG is elicited for the multivariate time series of hourly vehicle counts at the junction of three major roads in the UK. A flow diagram is introduced to give a pictorial representation of the possible vehicle routes through the network. It is shown how this flow diagram, together with a map of the network, can suggest a DAG for the time series suitable for use with an LMDM.     

EFFECTS OF INTERNET USE AND SOCIAL RESOURCES ON CHANGES IN DEPRESSION

We examine how people's different uses of the Internet predict their later scores on a standard measure of depression, and how their existing social resources moderate these effects. In a longitudinal US survey conducted in 2001 and 2002, almost all respondents reported using the Internet for information, and entertainment and escape; these uses of the Internet had no impact on changes in respondents' level of depression. Almost all respondents also used the Internet for communicating with friends and family, and they showed lower depression scores six months later. Only about 20 percent of this sample reported using the Internet to meet new people and talk in online groups. Doing so changed their depression scores depending on their initial levels of social support. Those having high or medium levels of social support showed higher depression scores; those with low levels of social support did not experience these increases in depression. Our results suggest that individual differences in social resources and people's choices of how they use the Internet may account for the different outcomes reported in the literature.     

Communicating Global Activism

Many observers doubt the capacity of digital media to change the political game. The rise of a transnational activism that is aimed beyond states and directly at corporations, trade and development regimes offers a fruitful area for understanding how communication practices can help create a new politics. The Internet is implicated in the new global activism far beyond merely reducing the costs of communication, or transcending the geographical and temporal barriers associated with other communication media. Various uses of the Internet and digital media facilitate the loosely structured networks, the weak identity ties, and the patterns of issue and demonstration organizing that define a new global protest politics. Analysis of various cases shows how digital network configurations can facilitate: permanent campaigns; the growth of broad networks despite relatively weak social identity and ideology ties; transformation of individual member organizations and whole networks; and the capacity to communicate messages from desktops to television screens. The same qualities that make these communication-based politics durable also make them vulnerable to problems of control, decision-making and collective identity.     

论国际互联网对旅行社业的冲击

进入 2 1世纪以后 ,旅游越来越被普通老百姓所接受 ,旅行社作为旅游业的三大支柱之一 ,前景光明。但随着国际互联网的出现和广泛使用 ,给传统旅行社带来了巨大威胁。本文在详细论述互联网给旅行社带来冲击的基础上 ,指出在互联网影响下旅行社存在发展的机遇 ,提出旅行社生存发展的具体对策。     

海南省大学生网络成瘾和心理健康水平研究

以海南省3所高校的421名在校非体育专业本科生为研究对象，并与体育专业本科生的网络成瘾情况进行对比研究，所有数据均采用SPSS11软件进行统计分析。结果表明：体育生的网络成瘾现象均高于文科生和理科生，而文科生又高于理科生；理科生网络成瘾者的心理健康水平均高于体育生和文科生，体育生则高于文科生。     

Internet环境下的网络教学

Internet环境下的网络教学已成为人类进行终身教育和创新教育的最佳平台。文章着重论述了Internet环境下的多模式教学———讲授模式、个别辅导模式、讨论学习模式、探索学习模式、协作学习模式     

网络条件下高校学生思想教育工作的现状及对策

网络由于其特有的传播方式 ,对高校学生的思想观念和精神世界产生了巨大影响。它既为高校学生思想教育工作提供了新的方式、手段和方法 ,同时也对其提出了严峻的挑战。应适时抓住时机、更新观念、转变角色 ,重视建立网上学生思想教育工作阵地 ,加强思想教育工作者的素质建设 ,并采取有效措施加强网上信息的管理和监控 ,在网上唱好主旋律 ,打好主动仗