简单实用的近程双机通讯技术

应用互连技术连接两台计算机，不仅可以实现双机通讯，而且可以实现近程计算机之间系统资源的共享．本着降低设计成本，缩短设计周期，便捷实用的原则，介绍了Windows 98本身所具有的进行双机通讯的3种方法．     

简单实用的近程双机通讯技术

应用互连技术连接两台计算机，不仅可以实现双机通讯，而且可以实现近程计算机之间系统资源的共享。本着降低设计成本、缩短设计周期、便捷实用的原则，文章介绍了Windows98本身所具有的进行双机通讯的三种方法。     

基于RS232/485的智能仪表远程监控系统的设计与实现

针对计算机与智能仪表间的通讯进行研究,讨论基于VB6.0的串行通讯控件与RS232/485的通讯技术,开发计算机与智能仪表之间的程序,实现计算机与智能仪表的远程通讯,可以较好的实现现场数据的采集与监控.     

AVR单片机TWI双机通讯

叙述了AVR单片机TWI双机通讯的端口连接,控制寄存器TWCR的设置,并给出了实用的示例程序.     

AVR单片机SPI双机通讯

叙述了AVR单片机SPI双机通讯的端口连接,控制寄存器SPCR的设置,并给出了实用的示例程序.     

基于VB6．0液晶显示系统的设计

设计利用VB提供的MSComm通讯控件完成PC机与单片机的串行通讯,由单片机控制液晶显示模块,实现通过计算机输入字符直接显示在液晶显示屏的控制系统。     

可扩展计算机网络设计软件系统的开发设计研究

文章旨在顺应人们对智能化通讯越来越高的要求,将计算机网络应用的效能提高,设计合理的计算机网络应用本系统.通过提出一种可扩展的计算机网络设计软件系统,对计算机网络设计软件系统知识结构进行分析,并指出面向对象方法的一种网络设计过程.基于可扩展计算机网络设计软件系统的开发设计,满足了人们越来越高的智能化通讯要求,提高了计算机网络应用效能,系统有着稳定的运行,促进了计算机网络技术更加完善成熟的发展,为我国计算机网络的合理利用提供了便利条件.     

端口的设置和利用

讨论了如何对IBMPC机的串、并口进行设置及利用并行打印口进行高速信号采集,双机通讯,I／O控制以及通过软、硬件的方法实现信息的并行输入输出和进行多种功能扩展的实用方法。     

高可靠的双机热备控制系统

运行相同控制程序的配量相同的控制主机,通过实时数据交换模块形成互为热备份的冗余结构,利用可以自动切换的冗余配置的通讯网络以及冗余的现场控制单元,构成完整的双机热备控制,可极大提高控制系统的可靠性和安全性,满足如大型火电站、核电站、易燃易爆等特殊场合的控制要求.     

AVR单片机USART双机通讯

叙述了AVR单片机USART双机通讯的端口连接、控制寄存器UCSRB的设置,并给出了实用的示例程序．     

Optical computing

Optics has been used in computing for a number of years but the main emphasis has been and continues to be to link portions of computers, for communications, or more intrinsically in devices that have some optical application or component (optical pattern recognition, etc). Optical digital computers are still some years away, however a number of devices that can ultimately lead to real optical computers have already been manufactured, including optical logic gates, optical switches, optical interconnections, and optical memory. The most likely near-term optical computer will really be a hybrid composed of traditional architectural design along with some portions that can perform some functional operations in optical mode.     

浅析移动计算机网络中的通信技术问题

移动计算机通信网络是通信技术在计算机网络中充分应用的成果.它以固定有线的计算机网络为基础,充分应用通信技术进行改造来实现计算机的移动通信,最终建立移动计算机通信网络.     

基于VMware、GNS3实现虚拟网络实验室

VMware、GNS3可以分别虚拟计算机与网络设备,它们能各自单独构建子网,完成网络实验.在分析了它们相互连接的原理后,提出一种在单机上实现虚拟网络实验室的方案,该方案通过和宿主机中的虚拟网卡桥接,间接实现GNS3和VMware之间的通信,并构建了1个典型的网络拓扑结构.在该虚拟网络环境下测试了Zebra路由软件包,实现了Linux主机和GNS3虚拟路由器之间的动态路由,验证了利用VMware、GNS3构建虚拟网络实验室的可行性.     

量子计算与量子几何位相

从量子力学原理出发,说明量子计算是量子计算机的理论基础。量子计算机拥有比经典计算机更为强大的计算能力。而实现量子计算机的关键之一是使用量子几何相位来实现高保真度的普适量子逻辑门。先简要介绍量子计算的基本原理和量子计算机实现所存在的困难以及所采用的方案,然后重点讨论与实现量子计算机方案有关如核磁共振、腔量子电动力学(C-QED)和超导约瑟夫森隧结中的量子几何相位。     

计算机网络协议浅探

计算机的诞生和人们对信息需求的不断扩大,推动了计算机网络的发展,在通信网络中,由于挂接到网上的计算机软、硬件资料的差异给通信带来困难,所以通信网络的全体“成员“必须共同遵守网络协议,以便实现彼此通信和资源共享.     

Editorial

The preparation of science teachers to integrate computers in their teaching seems to be a challenging task, and teacher educators need to undertake systematic and coordinated efforts for effectively preparing teachers to teach with computers. The present study implemented a professional development approach for in‐service science teachers regarding the pedagogical uses of computers in teaching and learning, and examined its effectiveness. The results showed that the approach was effective in adequately preparing science teachers to design computer‐enhanced learning with various computer applications. Specifically, the majority of the teachers who participated in the study selected appropriate science topics to be taught with computers, transformed science content with appropriate computer tools and computer‐supported representations, identified computer‐supported teaching tactics, and integrated their computer‐enhanced activities in the classroom with inquiry‐based pedagogy. The results of the study provide baseline data about the effectiveness of the approach, and they can be used for comparison purposes in future studies, which may be conducted with the intention of further validating or even improving the suggested professional development approach.     

Computer Anxiety,Computer Self-efficacy and Attitudes towards the Internet of First Year Students at a South African University of Technology

Notwithstanding the benefits that information and communications technology (ICT) offers to learning processes, the majority of learners in rural and township areas in South Africa either do not have access to computers and the internet, or they lack sufficient skills to exploit the benefits of ICT. This lack of skills and access to computers may lead to computer anxiety and low computer self-efficacy among undergraduates entering higher education. Low computer anxiety and high computer self-efficacy levels are important factors in assisting students to be academically successful in the present technological era. This article reports on a study that assessed the computer anxiety, computer self-efficacy and attitude towards the internet among first year students at a South African university of technology. Data collection was done through a five section survey. The research revealed that students suffer from moderate computer anxiety; they have a moderate compute self-efficacy; and their attitude towards the internet is positive. The results, research contributions, and limitations are discussed, and implications for future studies are suggested.     

量子几何相位在量子计算机中的应用

量子计算机具有比经典计算机更为强大的计算能力．而实现量子计算机的关键之一是使用量子几何相位来实现高保真度的普适量子逻辑门．文章先简要介绍量子计算机的基本原理和它的实现所存在的困难以及所采用的方案,然后重点讨论与实现量子计算机方案有关如核磁共振、腔量子电动力学（C—ED）和超导约瑟夫森隧结中的量子几何相位．