超级电容器提供重要的高功率特性

当今的便携式电子产品是科学技术的一个奇迹,它们具有各种各样的功能,而这些功能在几年前只是设想.有了它们,我们可以将照相机功能、电视功能、高保真收音机功能、GPS导航功能和无线通信功能全部放入我们的口袋.所有这些功能都可以在如今的商用产品中找到,体积不会大过一盒香烟.由于所有这些能力,你一定会认为这些产品会成为需要经常在外的人最好的帮手,但实际上它们却常常成为纯粹的玩具,因为它们的电池不能负担这些功能.当移动相机电机、录制图像到闪存、在无线系统上发送突发信息时,都需要大功率脉冲,所有这些过程都过度要求现有的电池技术,严格限制了它们充电期间的实际寿命.     

关于强制性产品认证问答(二)

一、政策与规则 1、如何划定强制性产品认证工厂,即其划定原则是什么? 笞:1.相同的产品大类; 2.相同的检测标准系列;     

GPRS工作状态实例分析(下)

图１３手机接入ＧＰＲＳ业务的信令流程 (图１４手机协议层的状态迁移(流程５)８问题解释以下问题的解释是针对目前ＧＰＲＳ网络设置。先将各种状态的组合关系归纳如下 ,分析解答问题时 ,就可以找到具体的组合关系进行入手。如图１５所示。８．１ＧＰＲＳ手机上网期间 ,有时能打通电话 ,有时却不能用户反映有时在ＧＰＲＳ上网期间不能接收到电话 ,不符合ＧＰＲＳ具有数据传输与话音传输同时进行的宣传 ;呼叫正在上网的用户 ,有时得到该用户不在服务区的通知音。上述两个问题实际就是一个问题。由于ＭＡＣ／ＲＬＣ资源是动态分配的 ,需要传输…     

GPRS工作状态实例分析(上)

广东移动GPRS网络已经正式开始商用,新网络的引入必然在实际运行维护中产生各种疑问。文章从分析GPRS协议层工作状态入手,在阐述各种状态的相互关系基础上,结合实际信令数据,分析并解释了实际遇到的一些问题。     

基于Web的个人知识管理（PKM）系统的开发与研究

21世纪是知识经济时代，随着“知识爆炸”的到来，个人知识管理越来越体现出其重要性。从个人知识管理的概念出发，着重介绍了个人知识管理系统功能模块及其关键技术，最后探讨了个人知识管理的前景和面临的挑战。     

诊所

老狼啊!最近我遇到一个特别郁闷的事，我和我朋友同时购买了行货索爱W800c手机，在进行电话簿的联系人查找时，我朋友的就能够使用首字声母进行查询，而我的W800c按照相同的方法却不能进行查询。这是怎么回事呢？而且两个手机的软件版本都是一样的，快帮帮我啊!     

一个基于Web的可扩展工作流工具

在企业内部有许多异构工作流程,它们具有一定的通用性,但没有统一的方式来设计或管理。我们迫切希望能有一个通用的工作流工具,它可以共享资源并适应异构工作流程。考虑到项目特点以及企业需求,我们提出了一个基于Web的可扩展的工作流模型。此外,我们结合了系统结构和功能的例子分析和阐述了这个新模型。     

基于Web的会员管理系统

介绍了陕西省电子学会会员管理系统的设计与实现。选题从电子学会目前的会员管理方法出发,设计并实现了基于Web的会员管理系统。介绍了系统所使用的开发技术,给出了系统的架构模型和各功能模块,提出了进一步的改进方向。该系统的建立有助于学会日常工作的开展和提升。     

A Web-based collaboration teaching environment

This article presents a collaborative teaching environment that lets students work through lab-based tutorials with access to a remotely located lecturer via Webcams, email, discussion forums, and chat rooms. Remote-control software also lets lecturers take control of the students' lab computers to troubleshoot problems. This project aims to facilitate knowledge transfer between students and lecturers.     

基于Web的体育场馆预约系统

为提高体育场馆预约效率,文中开发了一种基于Web的体育场馆预约系统,为用户提供了一个方便快捷的网络预约方式。预约系统包含场馆信息展示、用户注册登录、提交预定信息、预定状态图与后台管理等功能。该系统采用HTML、CSS、JavaScript (JQuery)等技术实现Web前端界面交互,服务器端使用了PHP语言以及ThinkPHP框架和MySQL数据库来开发。测试结果表明,系统使用方便、界面友好,实用价值较高。     

The Active3D-Build: a Web-based civil engineering platform

We developed the Active3D-Build to improve civil engineering project management. This Web-based platform lets geographically dispersed project participants-from architects to electricians to plumbers-directly use and exchange project documents in a centralized virtual environment using a simple Web browser. A 3D visualization lets participants move around in the building being designed and obtain information about the objects that compose it. The Active3D-Lab is the software development arm of the Archimede Group, a civil engineering and facility management firm. The Active3DLab team includes three administrative staff members, eight developers, and three University of Bourgogne researchers. We're already marketing this product, and several enterprises use it in their civil engineering projects     

Web网上电子书店的分析与实现

介绍了基于Web网站的网上电子书店的分析与实现的方法，其中主要介绍了利用PHP访问网络数据库MySQL实现网上购物的流程以及服务器端数据的处理过程。文中介绍的方法对于建立中小型电子商务网站也具有一定的借鉴意义。     

基于WEB的集群监控系统的研究与实现:WBCMon

文章在现有集群监控系统的基础上,提出了一种新的集群监控系统的实现方案———WBCMon。采用关系数据库代替以前的文件方式来存储性能数据,便于数据的索引和处理,增强了可扩展性。基于WEB的图形界面增加了使用的方便性和灵活性。面向对象的设计方法使系统更容易扩展和移植。     

Web-based surveys for corporate information gathering: a bias-reducing design framework

The cost effectiveness of Internet-based communications in the ever more fully networked business environment continues to drive the use of Web surveys for corporate information gathering. However, simply applying traditional survey techniques to the Web can result in significant shortcomings in the data so gathered. Recent research has been directed at these issues, within the context of Web surveys as a general research tool. We discuss the application of that research to the narrower organizational context. This article synthesizes from the literature on Web-based surveying and from the authors' own experiences. It suggests a design framework for managers and communications professionals interested in increasing the statistical validity of Web surveys deployed in an organizational context. The results of a recent organizational Web survey developed and administered within the framework guidelines support the efficacy of the framework.     

基于Web的IPTV实验平台系统设计

阐述了基于Web的IPTV系统的整体架构,说明了系统设计的基本思路,通过3部分展示了以Windows Media Server作为流媒体服务器,具有视频点播和直播功能的IPTV实验平台系统的搭建过程。用户通过的计算机终端连接系统,不仅实现了电视节目直播、视频点播,还可作为各种学术报告、大型活动现场直播的平台,具有较高的实用价值。     

Web E-speak: facilitating Web-based e-services

E-Speak, Hewlett-Packard's e-services initiative, is an open, distributed platform that lets e-services dynamically and securely advertise, discover, and interoperate with each other. Web E-Speak, the gateway to E-Speak on the Web, facilitates engineering Web-based e-services by taking into account their requirements for dynamic ad-hoc discovery, secure interaction, and global accessibility     

Comments on “Orthogonal Subspace Projection (OSP) Revisited: A Comprehensive Study and Analysis”

A recent paper discussed the orthogonal subspace projection (OSP) algorithm. That paper advocated the use of OSP for target detection and material abundance estimation for mixed pixels in hyperspectral images. However, it was proved in an older paper that an algorithm called the constrained signal detector (CSD) generally outperforms the OSP for the applications of target detection and abundance estimation. The purpose of this correspondence is to review the differences in detection and estimation performance between OSP and CSD     

A Web-based TelePACS using an asymmetric satellite system

We have developed a WWW-based TelePACS that can access every permitted PACS server via the Internet. Java programming techniques were used to implement the system, which can access and retrieve medical information and images through Web browsers such as netscape without specific tools. We also have developed a consolidator that performs as a manager to connect a conventional PACS server to a Web-based TelePACS server. We have developed the asymmetric satellite data communication system (ASDCS) as a fast communication system. The ASDCS uses a receive-only satellite link for data delivery and a terrestrial network for control communication. In conclusion, we were able to develop a cost-effective and fast PACS using Web technology. Web technology expanded the scope of use for a dedicated PACS from intrahospital to public use     

基于Web的计算机等级考试报名系统设计与实现

为了提高全国计算机等级考试考点考务管理的信息化水平,设计实现了一个基于Web的计算机等级考试报名系统,作为官方系统的辅助子系统,为考生提供了基于web的访问方式,减轻了考务管理的工作量,也提高了管理的效率和信息化水平。     

A Java-based enterprise system architecture for implementing a continuously supported and entirely Web-based exercise solution.

Since machine-based exercise still uses local facilities, it is affected by time and place. We designed a web-based system architecture based on the Java 2 Enterprise Edition that can accomplish continuously supported machine-based exercise. In this system, exercise programs and machines are loosely coupled and dynamically integrated on the site of exercise via the Internet. We then extended the conventional health promotion model, which contains three types of players (users, exercise trainers, and manufacturers), by adding a new player: exercise program creators. Moreover, we developed a self-describing strategy to accommodate a variety of exercise programs and provide ease of use to users on the web. We illustrate our novel design with examples taken from our feasibility study on a web-based cycle ergometer exercise system. A biosignal-based workload control approach was introduced to ensure that users performed appropriate exercise alone.