网站更新，跟踪到底

现在很多新闻网站都支持RSS，这样你不用开网页也能查看到订阅网站的更新内容。但如果你常去的网站没有RSS功能怎么办呢？其实一样能随时知晓网页的更新，下面就跟我一起来动手试试吧。[编者按]     

网页更新查看器页面升级Email立即通知

虽然现在许多的网站提供有RSS feed订阅功能,能让用户了解网站更新的内容。但仍有大部分网站没有此功能,那么该如何了解其更新情况呢？“ChangeDetection”（http：//www．ChangeDetection．com）站点就能为用户监控网站的变化。一旦页面上有所变化,即可发送电子邮件通知用户。更难得的是。程序还能够记录下页面的变化,提供给用户参考。     

不登录也能及时知道网站是否更新

为了及时掌握最新信息,我们需要不断登录网站去查看内容是否已经更新。不过,每次都要登录显然很麻烦,有时会因为登录的时间太早或太晚,导致网站没有更新或早已更新,信息已经过时。难道就没有办法在不登录的情况下,及时得知网站是否已经更新?当然有! WebSite-Watcher(以下简称WeW)就能满足我们的这个愿望。     

抓虾——抓下网络新信息

是不是烦透了每天打开多个让人眼花缭乱的网站,查看内容是否有更新,艰难地搜索需要的信息?最倒霉的是好不容易打开了网站,却没有可看的更新内容,头疼吧?“抓虾”网能按照用户希望的格式,将经常访问网站的最新内     

盘点遭受最多误解的网站优化常识

正以下是一些被站长和seo们误解最多的几点,看看你有没有中招。百度快照时间和网站权重没有直接关系网页权重对网站快照更新时间有辅助作用,但网站快照更新时间是根据网站历史更新频率和内容质量来决定的,更新频率越快,蜘蛛抓取就越频繁。另外内容页更新频率是很小     

基于大型网站的搜索引擎网页更新方法研究

大型网站是网络信息的核心,其信息规模之大,更新速度之快是中小型网站不可比拟的,对大型网站网页搜索的好坏直接影响搜索引擎的整体性能。本文在分析分类网页更新策略的基础上,根据大型网站本身的特点提出了一种增量式信息更新方法。实验分析表明,这种增量式信息更新方法很大程度上提高了大型网站搜索引擎网页的更新效率。     

连接家校的桥梁

史小教育在线在建站伊始就明确了网站的宗旨。那就是为学生服务，为家长服务。为了让家长们能及时了解学校的各种动态，网站的更新速度是关键。史家胡同小学在北京乃至全国来说都是一所知名的学校。学校经常有一些重要的活动，如领导调研参观，接待外宾等重要活动，类似这样的新闻，总是第一时间出现在学校网站上。由于网站的更新速度快．家长和学生们都愿意通过网站了解学校的一举一动。     

基于Web挖掘的主页多主题更新模型

针对改善网站主页中多个主题更新的合理性问题,提出了一种新颖的基于Web数据挖掘技术的主页主题更新模型.对当前主页主题更新方法进行分析,指出目前一些大学校园网站主页主题更新的不合理性,然后通过数据挖掘,从安徽理工大学网站Web日志中提取有效数据,分析各个主题的点击率随时间的变化趋势,进而提出基于点击率的网站主页主题更新模型.实验结果证明,模型能够实现对主页主题的合理更新,有效提高网站主页的受欢迎程度.     

基于大型网站的搜索引擎网页更新方法研究

大型网站是网络信息的核心,其信息规模之大,更新速度之快是中小型网站不可比拟的,对大型网站网页搜索的好坏直接影响搜索引擎的整体性能.本文在分析分类网页更新策略的基础上,根据大型网站本身的特点提出了一种增量式信息更新方法.实验分析表明,这种增量式信息更新方法很大程度上提高了大型网站搜索引擎网页的更新效率.     

SERFing the web: The Re-Web approach for web re-structuring

In our emerging digital paper-less society, massive amount of information is being maintained in on-line repositories and diverse web site representations of this information must be served over the Internet to different user groups. E-commerce and digital libraries are two representative sample applications with such needs. In this paper we present a database-centric approach called Re-Web that addresses this need for flexible web site generation, re-structuring, and maintenance. Re-Web is based on two key ideas. First, we exploit the web site structure by associating web semantics (XML equivalents) with the modeling constructs of the ODMG object model to aid the web site generation process. By capturing the logical structure of web views within the OODB system, we can efficiently maintain the web views using standard database techniques. Secondly, to ease the process of specification and construction of multiple customized web view sites, we also propose the notion of generic web view transformations that are encapsulated into re-usable templates. Thus desired new web view sites can be generated simply by applying the corresponding transformations on the underlying database to produce web view classes and then by applying the web semantics on the newly built view classes. The Re-Web system has been implemented using PSE by Object Design Inc. as object repository, ODMG as object model, OQL as transformation language, SERF as OODB evolution facility and IBM XML parser and LotusXSL processor to aid the web site generation. A case study using Re-Web is also presented to illustrate the working of the system. To the best of our knowledge, Re-Web is the first web site management system focusing on the issue of re-usable view generation templates at the content and not at the presentation style level of abstraction. This revised version was published online in August 2006 with corrections to the Cover Date.     

CTW: an integrated computer and telephone‐accessed WWW system

This work presents the development of an integrated computer and telephone‐accessed WWW system (CTW) to provide a ubiquitous web access service. The CTW system serves as an intermediary between the telephone user and web sites. The CTW system retrieves and then converts the proposed Hyper Phone Markup Language (HPML) specified web pages into speech patterns. Telephone users can access information, including form‐based transaction services, on HPML‐specified web pages using a telephone set anywhere in the world by connecting to the CTW system. Another feature of CTW is that HPML‐ specified web pages stored in cyberspace can also be accessed via regular browsers, including the current Netscape Navigator and Microsoft Internet Explorer. The CTW system provides a ubiquitous web access service for users at any degree of web‐literacy by integrating well‐installed telephone networks and the Internet. Copyright © 2000 John Wiley & Sons, Ltd.     

基于XML的Web内容管理及在线编辑/审核系统

为了解决企业更新和维护Web站点的成本和工作量过大的问题,论文实现了一个完整的基于XML的Web内容管理及在线编辑/审核系统,通过将内容与表现分离以及运用各种快速编辑技术,大大提高了更新和维护Web站点的效率、降低了对IT专业人员的依赖,并且通过提供内容审核工作流,保证了站点内容的质量。此外,由于实现了内容与表现的分离,能很方便地使站点支持移动设备的访问。     

基于多粒度树模型的Web站点描述及挖掘算法

随着Web所拥有的信息量和信息种类的急剧增长,Web站点挖掘对于自动实现特定主题的Web资源发现和分类具有重要的意义.然而现有的Web站点分类或挖掘算法在利用上下文语义信息、去除噪声信息以进一步提高分类准确率等方面还缺乏深入研究.从站点的采样尺寸、分析粒度和描述结构3个方面分析了设计高效的Web站点挖掘算法所需要解决的问题.在此基础上,提出了一种新的Web站点多粒度树描述模型,并描述了包括基于隐Markov树的两阶段分类算法、粒度间上下文融合算法、两阶段去噪程序以及基于熵的动态剪枝策略在内的多粒度Web站点挖掘算法.站点的多粒度描述方法及挖掘算法为多站点查询优化、Web效用挖掘等的深入研究奠定了基础.实验表明,该算法相对于基线系统平均可以提高16%的分类准确率,并减少了34.5%的处理时间.     

Improving web accessibility: a study of webmaster perceptions

Large percentages of web sites continue to be inaccessible to people with disabilities. Since tools and guidelines are available to help designers and webmasters in making their web sites accessible, it is unclear why so many sites continue to be inaccessible. In this paper, we present the “Web Accessibility Integration Model,” which highlights the multiple points within web development where accessibility can be incorporated or forgotten. It is uncertain why webmasters do not use the various tools and guidelines that currently are available for making web sites accessible. A survey was created, and data was collected from 175 webmasters, indicating their knowledge on the topic of web accessibility and the reasons for their actions related to web accessibility. Findings and future directions for research are discussed.     

基于SAML和XACML的Web服务访问控制模型

Web服务采用了通用的协议和技术,便于用户访问,已成为了分布式计算的研究热点,但这种方便也带来了安全性的隐患。提出了一个基于SAML和XACML的Web服务访问控制模型,利用SAML协议实现单点登录,采用XACML策略描述语言对用户进行访问控制。模型在扩展SAML协议的基础上,把XACML引入Web服务能够更好地对服务端受保护资源进行控制,从而实现Web服务的安全访问控制。     

互联网化学信息资源查询系统的设计与制作

在化学的研究和学习中为了更好地查询和利用互联网上的化学资源，需要提供一个方便、快捷的离线搜索软件。我们设计制作了“化学舵手”（Chemical Wheelman）查询系统。系统对Internet网上的化学网站进行了收索、筛选，建立了300多个国内外化学网站的离线查询系统。系统设计为全中文界面，并对国外英文化学网站进行了二级汉化与引导，达到使用方便、查询快捷、准确的目的。     

分布式系统下挖掘关联规则的两种方案

对关联规则的分布式挖掘问题进行了探讨,给出了两种实现方案。一是采用局部－局部的通信模式,各个站点的通信负载比较均衡;二是采用局部－全局的通信模式,减少了各局部站点的通信负荷,实现了各局部站点的完全异步,但对全局站点的性能要求较高。     

Iconic hyperlinks on e-commerce websites

The proper use of iconic interfaces reduces system complexity and helps users interact with systems more easily. However, due to carelessness, inadequate research, and the web's relatively short history, the icons used on web sites often are ambiguous. Because non-identifiable icons may convey meanings other than those intended, designers must consider whether icons are easily identifiable when creating web sites. In this study, visual icons used on e-business web sites were examined by population stereotypy and categorized into three groups: identifiable, medium, and vague. Representative icons from each group were tested by comparing selection performance in groups of student volunteers, with identifiable and medium icons improving performance. We found that only easily identifiable icons can reduce complexity and increase system usability.     

A group-decision approach for evaluating educational web sites

With the advent of network technologies, many educational web sites have been developed to assist students in the learning of subjects on computer networks. However, without proper aid, students may have difficulty in selecting appropriate web sites, that are of benefit to them; hence, studying, evaluating and recommending educational web sites has become an important and challenging issue. In this paper, a group-decision approach is proposed for evaluating educational web sites. Several soft computing technologies have been employed in the approach, including fuzzy theory, grey system and group decision method. A computer-assisted web site evaluation system, EWSE (Educational Web Site Evaluator), has been developed, based on an experimental approach, which is capable of selecting the proper criteria for an individual web site and achieves greater accuracy when evaluating results.