异构数据集成技术的发展和现状

该文对异构数据集成技术的产生、发展及目前的最新情况进行了介绍。文章首先介绍了这一技术产生的背景和研究目的。然后介绍了相关的概念、技术及开发工具。随后对现有的异构数据集成系统进行了简单的介绍,并对其中很有代表性的Lore系统进行了着重介绍。在文章的最后,介绍了笔者所做的研究工作和下一步的工作目标。     

基于GPIB的电源测试系统

介绍了基于GPIB总线技术的电源测试系统;详细介绍了系统的硬件组成;详细介绍了软件的用户界面及功用。     

实时监控系统中的新技术--OPC标准

简要介绍了实时监控系统中的一种新技术-OPC标准，介绍了该标准产生的背景及优点，对OPC接口的结构体系进行了简要介绍，详细介绍了OPC数据访问自动化接口，给出了VB程序连接OPC服务器的详细代码。     

基于WebServices的基建项目管理系统的研究与实现

本文首先介绍了软件系统的开发背景和预期要达到的目标,然后在系统的体系结构上进行了简单的分析,在使用的关键技术进行了简单的介绍,对系统在系统安全方面进行了详细的介绍,最后介绍了整个软件系统的特点.     

异构数据库中的数据类型转换

简要介绍了异构数据库系统的基本概念以及对异构数据库数据类型转换的需求分析;重点介绍了异构数据库数据类型转换所面临的主要技术问题及解决方案;并介绍了XML在异构数据库系统中的应用;最后,简要介绍了异构数据库系统的应用领域及展望。     

基于BEOWULF的PC集群系统设计及并行编程的研究

介绍了机群的概念,重点介绍了Beowulf集群。在此基础上,构建了BeowulfPC集群,并详细介绍其软硬件的配置.最后,通过对MPI的介绍,结合实例,对系统进行了性能评测。此系统已运用于实际工作中,取得了良好的效果。     

利用xml语言创建简单留言的C#程序设计

介绍了XML的主要特点。介绍了利用XML特点创建简单留言的c#程序设计,通过实例重点介绍了其设计方法及应用情况。     

关于80X86保护模式下任务切换的实现

首先简要介绍了 80X86保护模式的特点 ,然后介绍了该模式下相关的数据结构和任务切换的途径 ,最后介绍了任务切换的实现过程     

LAMP主机的架构

文章首先介绍了当前主流WEB技术的特点及其在各行业的应用。然后介绍了成功架构LAMP主机的方法并介绍了使用phpBB2论坛进行整体测试看安装是否成功的方法,最后介绍了LAMP主机在架构中应该注意的问题。     

Photoshop色彩模式浅探

首先介绍了Photoshop色彩模式的种类,然后详细介绍了常用的一般色彩模式的特点、用法和注意事项,最后介绍了不同色模式之间的转换方法。     

Assessing the computer attitudes of students: An Asian perspective

Research has found that computer attitudes play a key role in influencing the extent to which students accept the computer as a learning tool and in determining the likelihood that computer will be used in the future for learning and study. A sample of 183 students reported their computer attitudes using a Likert-type questionnaire with three subscales, computer importance, computer enjoyment, and computer anxiety. One-way MANOVA revealed no significant differences in computer attitudes by gender although male students reported more positive towards the computer than female students. There were significant differences between students who own computers at home and those who do not and students who own a computer at home also reported a lower level of computer anxiety compared to those who do not.     

浅析计算机网络中硬件的故障与维护

计算机网络已普及到大部分企业,如何保养和维护好企业的计算机网络硬件,并且及时地解决计算机网络硬件故障,最大限度地保证企业计算机网络的高效和安全,成为了每个计算机网络硬件管理者关心的问题。本文将从计算机网络硬件的基本常识入手,论述了计算机网络常见的硬件故障,最后提出了计算机网络硬件维护的常用方法。     

壁面爬行遥控检查机器人控制系统的研制

本文介绍壁面爬行遥控检查机器人控制系统，该控制系统采用二级计算机控制。二极计算机之间采用光缆进行通讯，主计算机采有工业级ＰＣ总线计算机，从计算机采用ＳＴＤ总线计算机，主计算机能够对控制系统中的其他部分及视觉系统，检查系统和支持系统的行为进行协调和管理。     

计算机信息安全技术及防护

随着计算机技术的飞速发展,计算机信息安全问题越来越受关注。各种计算机病毒的泛滥,各种木马猖獗,各种黑客事件曝光等等问题。可以说互联网的计算机都是不安全的,这些计算机可以被网上的任一台计算机攻击,即使不联网,也可能被强行插入的物理设备携带的病毒攻击。如何保护我们计算机的信息安全不被侵犯是我们目前面临的问题。本文介绍了计算机信息安全技术的概要,并详细探讨了目前计算机的各种信息安全防护技术。告诉读者如何才能通过各种方式保护计算机信息,营造一个安全的计算机防护系统。     

Development and validation of a computer expertise questionnaire for older adults

Prior computer expertise represents one of the most important predictors of performance when interacting with ICT (Information and Communication Technologies) and acquiring computer skills. Due to demographic changes, the older adult will become increasingly important as a potential user. However, there is a lack of instruments for the assessment of computer expertise in older adults, especially for novice users with restricted prior computer knowledge. A computer expertise (CE) questionnaire for older adults was developed, analysed (Study I) and validated (Study II). Item-analysis showed that the CE-questionnaire is particularly appropriate for the computer knowledge level of older adults and measures computer expertise sufficiently. Furthermore, it was found that computer experience (in terms of frequency of computer usage) is a poor predictor of actual computer performance, which has important implications for the theoretical conceptualization of computer expertise and its assessment.     

Development and validation of a computer expertise questionnaire for older adults

Prior computer expertise represents one of the most important predictors of performance when interacting with ICT (Information and Communication Technologies) and acquiring computer skills. Due to demographic changes, the older adult will become increasingly important as a potential user. However, there is a lack of instruments for the assessment of computer expertise in older adults, especially for novice users with restricted prior computer knowledge. A computer expertise (CE) questionnaire for older adults was developed, analysed (Study I) and validated (Study II). Item-analysis showed that the CE-questionnaire is particularly appropriate for the computer knowledge level of older adults and measures computer expertise sufficiently. Furthermore, it was found that computer experience (in terms of frequency of computer usage) is a poor predictor of actual computer performance, which has important implications for the theoretical conceptualization of computer expertise and its assessment.     

新型联动报警系统

提出对传统报警系统改进的办法:用PC机作为主机,用AT89S52单片机作为从机,采用RS485总线型网络系统。该系统的特点:(1)不仅主机可以呼叫从机,从机在必要时可以主动呼叫主机,避免了从机只能等待主机轮询访问的弊端,从而提高了系统实时性和可靠性;(2)由于报警的时间毕竟很少,因此没有必要让主机无休止地轮询访问各个从机。而且轮询的方式效率很低,主机未必能从多台从机中立刻定位到报警的那台从机。