JQuery Ajax异步处理JSON数据实现气象图片的显示

气象资料复杂多样,如何在气象信息网上快速显示气象资料图片,是气象开发工作者的重要工作之一。针对这种需求,提出在页面无刷新的情况下实现气象图片分类显示的效果。前台页面通过Ajax向后台的Servlet发出请求,后台Servlet处理用户请求后返回JSON格式的数据给请求页面,请求页面利用JQuery处理返回的JSON格式的数据,将结果呈献给用户。实验结果表明利用这种j Query Ajax异步处理JSON数据的方法很好地实现了页面对后台数据的数据无刷新访问,达到多种气象图片分类显示效果。     

Web日志挖掘中的会话识别算法

会话识别是Web日志挖掘的关键步骤,然而很多方法所得到的会话不够精确.针对Web日志挖掘中的会话识别问题,在最常用的Timeout方法的基础上,提出了一种改进的基于平均时间阈值的识别方法.通过动态计算会话中请求记录间的平均时间间隔,个性化地调整页面的时间阈值,相对于传统的对所有用户页面使用单一的先验阈值,该方法能够更准确地识别出长对话.最后对生成的侯选会话集进行二次识别,使识别出的会话更为合理有效.实验结果表明,会话质量得到了提高.     

采用异步技术动态显示服务器当前系统时间

文章介绍采用异步技术在客户端Web页面上动态显示服务器当前系统时间的方法。在客户端每隔一时间间隔通过XML-HttpRequest对象向服务器发出异步请求,获取并显示服务器系统时钟的当前时间。在服务器端采用异步页面模式由一线程来产生基于系统时钟的当前时间,而接受客户端请求的组件则可直接读出该时间并返回客户端。     

基于Ajax的ASP分销平台的实现

AJAX(Asynchronous JavaScript and XML)是一种客户端异步提交技术,以其强大的无刷新与服务器端进行交互的能力著称.在原mvc构下,使用ajax请求代替了页面刷新请求,并将业务逻辑中对规范客户端操作的约束放到了客户端,提出了一种新的实现模式OPOB.本文主要描述了一种使用ajax技术进行异步提交的,结合多种技术实现的web应用程序的具体实现.     

.NET架构下页面间跳转及数据传递的实现

探讨了.NET设计中Web页面跳转及数据传递的实现方式,分析了各种页面问跳转及数据传递方式的使用方法、使用场合及优缺点,对开发基于web的数据传递有很好的借鉴之处.     

优化的Web日志会话识别方法

关于Web使用挖掘中的会话识别问题,提出了一种改进的会话识别方法.统计每个页面的访问时间,并结合页面内容及站点结构生成页面访问时间阀值,再用页面访问时间阁值划分会话,然后对产生的会话集使用会话重组,即合并与断开的方法,对生成的会话集进行进一步地优化.通过实验结果表明,该方法所得到的会话集更具有真实性.     

ASP/ASP.NET中超链接带参数的方法

在网页中超链接的方法有两种,即在本页面内部跳转和跳转到另外一个页面。这两种超链接带参数的方法都是在文件名后通过＂？＂加上参数值,然后使用request.querystring方法获取参数值。不过在本页面内部跳转时,需先设置锚点,然后在超链接地址中加上锚点。     

基于DataSocket技术的远程风机检测系统设计

本文基于了DataSocket协议。服务器端同时运行基于Server2003服务器的web技术,也运行用LabWindows/CVI开发的数据采集程序及DSTP协议,同时在所请求的数据传输页面(asp页面)下是通过VB6.0开发的一插件。在客户机端可以通过浏览器去访问使用MD5加密技术的用户认证页面,认证后跳转至数据传输页面,将采集到的风力发电机的振动动信息传输至客户机浏览器。这样将md5技术、Web技术、Polling Queue技术、ActiveX技术诸多优点的结合使得数据传输更安全、准确、简便。     

Web日志预处理中优化的会话识别方法

针对Web日志数据预处理中会话识别这一重要环节,提出一种优化的会话识别算法。在用户识别后,通过过滤框架页面大幅度减少实验产生的有效页面数,为每个页面设置访问时间阈值,并根据页面重要程度对该阈值进行调整,页面的重要性由页面内容及站点结构确定。实验数据显示,与对所有页面使用单一的先验阈值进行会话识别的方法相比较,该方法得到了真实性更强的会话集。     

基于相邻请求的动态时间阈值会话识别算法

在大数据平台的异常检测分析中,为提高会话序列建模的效率,提出一种基于相邻请求的动态调整时间间隔阈值的会话识别算法——DAITS算法。首先同时结合站点页面因子和用户访问页面时间的平均因子;然后在两者间加入合适的权重因子对时间阈值进行动态调整;最后根据判断是否超过该时间阈值来划分会话。实验结果表明,DAITS算法比传统使用固定阈值的方法在会话识别的精确率和查全率上提高了14.8%和13.2%,比动态调整阈值的方法在精确率和查全率上提高了6.2%和3.2%。     

一种结合Web内容主题的会话识别及切分方法

通过Web日志文件,识别用户及用户会话序列,然后提取会话序列所对应的Web页面内容,得到Web页面内容的核心概念,用核心概念描述会话主题,基于会话主题实现会话的切分。最后结合一个消费平台消费者的会话记录及Web内容,验证了该方法的准确性。     

面向异步通讯机制的网页分类研究

针对目前异步通信技术的广泛使用,提出了一种基于支持向量机（SVM）的网页分类模型。该模型根据异步通信技术反映在页面上的特点,确定特征向量元素,结合SVM分类算法,建立基于SVM的页面分类。实验表明,它不仅具有较高的训练效率,同时能得到很高的分类精确率。     

A note on on-line broadcast scheduling with deadlines

In this paper, we study an on-line broadcast scheduling problem with deadlines, in which the requests asking for the same page can be satisfied simultaneously by broadcasting this page, and every request is associated with a release time, deadline and a required page with a unit size. The objective is to maximize the number of requests satisfied by the schedule. In this paper, we focus on an important special case where all the requests have their spans (the difference between release time and deadline) less than 2. We give an optimal online algorithm, i.e., its competitive ratio matches the lower bound of the problem.     

Temporal pre-fetching of dynamic web pages

Although caching has been shown as an efficient technique to reduce the delay in generating web pages to meet the page requests from web users, it becomes less effective if the pages are dynamic and contain dynamic contents. In this paper, instead of using caching, we study the effectiveness of using pre-fetching to resolve the problems in handling dynamic web pages. Pre-fetching is a proactive caching scheme since a page is cached before the receipt of any page request for the page. In addition to the problem of which pages to be pre-fetched, another equally important question is when to perform the pre-fetching. To resolve the prediction and timing problems, we explore the temporal properties of the dynamic web pages and the timing issues in accessing the pages to determine which pages to be pre-fetched and the best time to pre-fetch the pages to maximize the cache hit probability of the pre-fetched page. If the required pages can be found in the cache validly, the response times of the requests can be greatly reduced. The proposed scheme is called temporal pre-fetching (TPF) in which we prioritize pre-fetching requests based on the predicted usability of the to-be pre-fetched pages. To minimize the impact of incorrect prediction in pre-fetching on processing of on-demand page requests, a qualifying examination is performed to remove unnecessary and low usability pre-fetching requests while they are waiting to be processed and just before their processing. We have implemented the proposed TPF scheme in a web server system and experiments have been performed to study its performance characteristics compared with conventional cache-only scheme using a benchmark auction application under different system and application settings. As shown in the experiment results, the overall system performance, i.e., response time, is improved as more page requests can be served immediately using pre-fetched pages.     

改进的Web访问日志会话识别算法

针对Web日志挖掘中的会话识别问题,分别对Timeout方法、参引长度法进行改进,提出了一种改进的会话识别方法.该方法运用网站的拓扑结构信息,动态设定各页面的时间间隔阀值,使页面时间间隔阀值同页面的重要程度结合起来.同时通过灵活界定内容页,并针对内容页,提出了一些启发式规则,突破了"参引长度法"所固有的一个会话中只包含一个内容页的瓶颈.该方法提高了会话识别的准确度,实验结果表明是有效的.     

基于扩展状态观测器的随机隐Markov正跳变系统有限时间异步控制

针对一类含不匹配扰动的随机隐Markov跳变系统, 本文研究了基于扩展状态观测器(ESO)的有限时间异步 控制问题. 首先, 引入一组扩展变量将隐Markov跳变系统转换成一组新的随机扩展系统, 补偿不匹配扰动对系统控 制输出的影响. 基于Lyapunov–Krasovskii泛函方法, 给出使得基于ESO的闭环随机隐Markov增广跳变系统是正系 统, 且有限时间有界的充分条件. 进而得到直接求解观测器增益和控制器增益的线性矩阵不等式. 最后, 通过仿真结 果验证了本文所设计的异步状态反馈控制器和观测器的有效性和可行性.     

提高网页浏览速度的探讨

通过HTTP协议分析了影响网页浏览速度的因素,并提出了提高网页浏览速度的解决办法,采用DIV+CSS布局方式和减少HTTP请求量,并在实验中验证了DIV布局方式较传统的TABLE布局方式网页浏览速度有了很大提高。     

The Library Course Page and Instruction: Perceived Helpfulness and Use among Students

Research guides can be divided largely into guides on particular subjects—subject guides—and guides tailored to the specific needs of courses—course pages. Recent studies indicate that online research guides are generally not helpful to college students unless the guides are linked to a course, either by being a course page or by being accompanied by an instruction session with the librarian. In this article, we report the findings of a study where students in a medium–sized (25 student), upper–division business course were asked about the helpfulness of a course page, the helpfulness of the librarian's accompanying instruction session, and how much they used the page. The student survey used mostly Likert scale questions. The study also reports on the course page's link traffic. Our results confirm earlier findings that a course page used in conjunction with librarian instruction is an effective tool to enhance student research. There were no control groups, and all respondents received both course page and instruction session. Seventy–one percent of the respondents indicated that the course page helpfulness ranged between “somewhat” and “very helpful,” and less than 10% of respondents said that they would not recommend a course page to other classes. Link traffic results indicate that neither a business subject guide nor a legal subject guide would have been as helpful to the respondents. These results support the argument that course pages should be preferred to subject guides when feasible.