利用Proxy Server实现Intranet与Internet互联的方案

目前,国内许多单位所建立的计算机网络基本都是局域网。以局域网为通信媒介采用万维网相似的技术构筑企业“内部”的计算机网络,形成内联网,即Intranet。 如何既经济又有效地将这些Intranet接入Internet呢?其中Proxy代理服务器起着“桥梁”的关键作用。     

通过代理服务器实现多机单线上网

介绍了小型局域网访问 Internet的两种常用方法 :Internet共享法和 Wingate共享法。它可以实现局域网中的全部用户只利用一个 Modem都能轻松上网 ,从而达到节省费用、增加用户的目的。     

无线局域网挑战3G

如果无线局域网的便携移动终端既能高速上网,又能打电话,还需要3G吗?     

通信局域网安全策略浅析

由于上网的数据遭到不同程度的破坏,被删除或被复制,数据的安全性和自身的利益受到严重威胁.因此,不论在局域网还是在广域网中,网络的安全措施应是能全方位地针对各种不同的威胁和脆弱性,这样才能确保网络信息的保密性、完整性和可用性.     

浅析局域网病毒的特点及防范策略

随着我国科技的进步,信息技术在人们生活中的应用更加广泛。在实际工作中,随着局域网使用频率的增加,也会带来较多的安全问题和隐患,病毒便是局域网安全防控中较大的威胁,也阻碍了计算机的正常运行。鉴于此,本文分析了局域网病毒的种类和特征,简述了病毒的传播方式,在此基础上重点提出了相关防范策略,以期让局域网维持较高的安全等级,更好地为用户服务。     

如何接通国际互联网?(下)

三、通过专线接入国际互联网 简单地说,通过电话拨号上网方式不能满足需要的话,就可能要采用专线上网方式了。有四种因素决定用户必须采用专线上网方式： 1．希望与 ISP保持永久的通信连接; 2．希望在国际互联网上提供信息发布服务; 3．希望在单位或区域的局域网中设置与国际互联网相连接的电子邮件服务器; 4．希望通过国际互联网实现内部异地网络间的互连。 目前国内数据网络提供的常见专线有： DDN（数字数据网）,提供专用的数字电路服务业务; DDN上开设的 X． 25的 PVC（永久虚电路）业务; DDN上开设的帧中继 PVC业务;…     

WAPI闯关，WiFi解禁

在北京公主坟的协亨手机卖场里,大喇叭正在反复播放着摩托罗拉A3100手机的促销广告,“A3100具备强大的无线上网功能”,这是国内上市的第一款同时支持WAPI和WiFi两种WLAN（无线局域网）的手机。此后不久,具备同样功能的诺基亚5530XM也将在国内上市。     

Linux和Windows之间的文件共享

一个局域网内常常存在着多种操作系统,在这些操作系统中比较流行的就是Windows和Linux操作系统。局域网中往往需要在这2种操作系统之间实现文件的双向共享,使用Samba软件包就可以很容易地实现这一目的。本文首先介绍了SMB协议、Samba的配置,然后通过实例详细介绍了如何利用Samba实现Linux和Windows之间文件的双向共享,并说明了Windows98和Windows2000与Linux共享文件资源时的区别。     

基于局域网的实时语音通信时延研究

在局域网中语音通信时延是影响语音质量的重要因素。为了最大限度地降低局域网中语音通信时延,提高语音质量,以采用低阶音频函数和UDP协议实现语音传输系统为基础,通过实验并分析了造成局域网中语音通信时延的主要因素,提出了在局域网中最大限度地降低实时语音通信时延的解决策略,实验数据证明,时延的分析是正确的,降低时延的策略是有效的。     

厂网分开与电价管制

我国厂网分开后的电价管制包括上网电价、输电价、配电价和终端销售电价的管制,由于终端销售电价将与上网电价实行联动,终端销售电价又是在上网电价、输配电价的基础上形成,所以电价管制的重点是上网电价和输配电价的管制。上网电价实行两部制电价,容量电价由政府制定,电量电价在竞争中产生,所以上网电价管制的重点是容量电价的确定、以及容量电价与电量电价的综合优化问题。本文将主要对我国现有上网电价形成机制中存在的问题、我国厂网分开后的上网电价的管制、西方国家输配电价管制的主要方式、我国厂网分开后输配电价的管制方式等问题展开论述。     

网络防火墙技术浅析

介绍了企业网络的安全屏障——防火墙的概念、作用、体系结构。互联网的资源共享与开放模式容易使网络受到黑客攻击,对于防范黑客入侵采取的主要措施是安装网络防火墙。防火墙的作用是防止不希望的、未授权的通信进出被保护的网络。任何关键性的服务器,都应放在防火墙之后。防火墙内外的计算机通信是通过代理服务器来中转实现的。本文给定了代理服务器、屏蔽路由器、双穴主机网关、被屏蔽主机网关、被屏蔽子网在防火墙内的具体实现,并对现代防火墙技术的局限性做了揭示。     

利用ASP实现Web数据库的访问

介绍了在Internet/Intranet网页设计中被广泛使用的ASP的基本概念和运行机制,ASP,ADO,ODBC和数据库之间的关系,以及ADO实现对数据库访问的具体方法和步骤。重点讨论了在利用IIS所含的ASP和ADO实现Web数据库访问时,如何明显提高Web数据库的执行效率,有效地节省数据库服务器的存储资源,提高网页浏览速度。通过示例说明数据库操作的方法。     

在PC机上架设个人Internet服务器

介绍了在基于Windows2000Professional平台的PC机上,采用动态域名解析技术架设个人Internet服务器。通过安装Apache,Serv＿UFTPserver等软件并进行正确设置,可以提供www服务和FTP服务。因此使自己或他人可以远程访问个人PC机中的数据,实现信息交流与共享。同时克服了专业Internet服务器所提供的免费空间的各种限制,从而可以采用最新的网络编程技术,在PC机上来构建自己的Internet动态网站。     

浅谈虚拟服装店铺的创建

网络是当今世界的发展潮流,网上购物从本质上给人类生活带来了深刻变化。本文阐述如何将现实的服装商店搬至虚拟的网络世界,建立虚拟服装店铺,使消费者能在家中通过鼠标来实现逛服装商店的目的,从而轻松完成其购置。     

实用校园网的建设

以建设中共河北省委党校校园网为例 ,介绍了一个校园网的完整实施方案。对校园网建设的实施目标和原则、校园网的功能需求作了详细分析 ,重点论述了校园网的拓扑结构、网络设备的选择 ,尤其是交换机和服务器的选择与安装、网络系统的配置 ,包括代理服务器与防火墙的安装与设置作了详细说明。最后介绍了通过微波通信方式接入Internet,该网的建成实现了校园网内的计算机快速的访问 Internet     

Obtaining indirect internet access: An examination how reasons for internet non-use relate to proxy internet use

Internet non-use is increasingly concentrated in vulnerable groups of people, especially among ageing populations and those with low socio-economic status. As participation in society becomes largely dependent on use of internet-enabled technologies, internet non-users may seek alternative ways of using the internet. Proxy internet use (PIU), where internet non-users ask internet users to perform online activities on their behalf, is a strategy for obtaining (indirect) internet access. This study examines factors for engagement in PIU, focusing specifically on how non-users’ reasons for disengagement relate to their engagement in PIU. The results from multivariate analyses of survey data from a nation-wide representative sample show that 47% of internet non-users in Slovenia who report having someone available for PIU in fact engage in PIU. In analysing four types of reasons for internet non-use—those related to interest, access, costs and skills—the results show that access issues are negatively related to engagement in PIU. Conversely, reasons related to skills issues are positively related to engagement in PIU. Considering that access to online services through PIU offers an important degree of digital inclusion, the results of this study have important policy implications. Policy initiatives tackling digital inequalities should be sensible to access and skills issues resulting in disengagement. For example, policies directed at providing and maintaining internet access at a household level may result in non-users’ increased opportunities for PIU. In contrast, skills policies should be directed at creating opportunities for informal and person-centred learning of digital skills, considering that non-users who are more aware of their deficiency in skills might be more aware of online opportunities.     

基于B/S的中小型酒店预订房间系统的设计与实现

针对目前中小型酒店预订房间所采用的基于C/S结构的MIS系统时所遇到的一些问题,设计和实现基于B/S的中小型酒店预订系统。采用UML对系统进行建模,选用Eclipse开发工具作为开发平台,采用基于MVC模式的STRUTS框架结构对Web系统进行设计,应用TOMCAT架设了Web服务器,在应用中取得了良好效果。     

互联网条件下企业边界及其战略选择

互联网的出现改变了人们的工作和生活方式,同时也对企业的经营带来影响.企业的边界在互联网条件下呈现出新的交化特点。互联网通过对企业价值链、管理成本、交易成本以及使用互联网成本的作用,改变着企业的边界。通过构建互联网条件下企业边界变化的模型,把握企业边界可能变化的方向,进而提出了对应的四种战略,分别是专业化战略、并购与被并购战略、外包战略以及竞合战略。企业应根据所处的内外部具体条件。选择相匹配的战略。以适应新经济条件下的竞争。     

The geopolitics of digital rights activism: Evaluating civil society's role in the promises of multistakeholder internet governance

Multistakeholderism is thought to play an important role in democratizing internet governance institutions and processes by including civil society. Therefore, scholars have studied the participation of civil society organizations, from the first phase of the World Summit on the Information Society through to the most recent Internet Governance Forum, to understand how they engage in and shape internet governance. However, this category is not well defined; therefore, it is not always clear whose interests are being advanced by civil society organizations. This study evaluates representation in civil society by examining the annual RightsCon conference as an ideal site of civil society engagement in internet governance in order to evaluate the potential of multistakeholderism to achieve the goals of democratization, representation, and inclusion. Through a meso-level analysis of discursive production at RightsCon that operationalizes a critical geopolitical rubric, this study finds that organizations that represent interests from the Global North and West are highly over-represented in three ways: in leading overall discourse, in claiming authority over global issues, and in driving specific topics such as misinformation, privacy, and internet shutdowns. These findings offer an empirical evaluation of global representation in internet governance, raising the stakes for further study about why and how the category of civil society meets expectations. Finally, conceptual implications are discussed, including evaluating earlier critiques of multistakeholderism as less democratizing in reality than in theory, affirming the analytic value of civil society discourse to policy research, and opening up questions about how a more precise understanding of civil society can contribute to multistakeholderism in internet governance.     

Hedonic Property Valuation Models: Are Subjective Measures of Neighborhood Amenities Needed?

Common applications of hedonic residential property valuation models have relied on proxy measures of neighborhood amenities rather than directly measured subjective evaluations. While this approach simplifies data collection, there is reason to suspect that the use of proxy measures has degraded the accuracy of hedonic valuation models. The extent to which the use of proxy measures may decrease predictive accuracy, and fail to capture the effect of neighborhood amenities, has not been reported previously. The results presented here show that direct subjective measures yield only modest improvements in price prediction. Careful use of proxy measures for neighborhood amenities appears to be cost efficient for large-scale appraisal work.