ELVIS在实验教学中的应用

本文主要介绍ELVIS在理工科院校信息类专业实验教学中的应用,探讨以虚拟仪器为核心的数据采集系统及其实现信号检测技术的设计方案.实验效果表明,ELVIS平台比传统实验教学装置更具创新性、实践性,充分调动了学生对实验内容的创造性.     

NI ELVIS在数字电子技术实验中的应用

为开拓学生在专业领域的创新发展,将在传统实验箱上进行的数字电子技术实验移植到ELVIS平台。首先介绍了美国国家仪器公司（NI）的虚拟仪器教学实验平台（education laboratory virtual instrumentation suit,ELVIS）,给出了一个利用ELVIS平台完成数字电子技术实验的实例,根据实验开发了基于LabVIEW编程的“软”仪器SFP以及对已有的“软”仪器的功能进行了部分扩展。     

基于ELVIS的模块化网络教学实验系统开发

为了构建一个基于虚拟仪器技术的网络化虚拟实验室,首先利用NI ELVIS教学平台设计了一套实验教学系统,然后提出了网络化教学实验系统的软件设计及实现方法.该实验系统采用模块化的设计思想,充分利用了ELVIS的软硬件资源.在现行局域网构架之上,以电工电子教学实验为例,采用LabVIEW程序设计方法,通过LabVIEW服务器端软件本身的Web Server网络通信功能,将实验结果发布到网上,实现了数据的远程访问和共享,达到了构架虚拟实验室的目的.     

NI拓展动手课程中使用的设计、原型平台——最新NI ELVIS Ⅱ＋配备100MS／s示波器和新款附加板卡

美国国家仪器有限公司（National Instruments,简称NI）发布了最新NI ELVIS Ⅱ＋设计与原型平台,作为一款简单、集成的系统,它可以将理论与实际应用相联系,这对于实验室和院校教学来说是理想的选择。新款NI ELVIS系列集成了一款板载100MS／s示波器,并配备一系列的新款附加板卡,拓展了仪器和电路应用。教授电路理论和电子学课程的老师可以使用该系统,有效地调动学生积极性,     

优化NI教学实验室共享平台，构建ELVIS课程实验资源生态系统

面对工科院校实验室设备更新与整合的需求以及实验课教学方法创新的趋势，提出了基于NI ELVIS（模块化工程教学实验平台），设计了一套覆盖工科主干专业课的资源型实验支撑平台，用于日常的本科实验教学。实现ELVIS效益最大化，构建并完善了适合中国国情的虚拟仪器课程实验资源生态系统。     

计算机辅助测试动态电路响应

本文叙述了利用研制的《计算机辅助电路实验系统》对动态电路响应特性的计算机测试、硬件的组成、软件的应用和测试误差的分析。使“电路分析基础”教学实验与计算机实测相结合，为一阶、二阶电路响应及一阶电路脉冲序列响应的观察提供了一种新的测量手段。     

设计型实验教学改革的探索

针对现阶段电工电子实验教学中存在的问题,阐述了设计实验教学原则、组织实施过程以及注意的问题。通过对Rc一阶二阶电路暂态响应设计实验实例分析,最终效果表明,设计型实验有利于增强学生主动探究、创新意识和工程实践能力,有利于学生受到科学方法论和科学态度的教育,有利于教师拓展思路、更新知识,实现教学相长。     

基于FPGA的瞬态响应测试仪

设计一种基于FPGA的瞬态响应测试系统,对二阶系统瞬态响应进行测试。该系统采用FPGA芯片XC3S400为控制核心,外部包括直流稳压电源供电、功能选择、信号调理、A/D转换和VGA显示等电路,运用硬件描述语言VHDL对FPGA进行编程,实现了测量二阶系统的瞬态响应参数的功能,瞬态响应波形以及测量结果等信息VGA显示,垂直灵敏度和扫描速度的挡位可以设置。和响应的理论值进行比较后,测试结果在误差范围内,整体指标良好,还实现了曲线的存储回放功能。     

设计型实验教学改革的探索

针对现阶段电工电子实验教学中存在的问题,阐述了设计实验教学原则、组织实施过程以及注意的问题.通过对RC一阶、二阶电路暂态响应设计实验实例分析,最终效果表明,设计型实验有利于增强学生主动探完、创新意识和工程实践能力,有利于学生受到科学方法论和科学态度的教育,有利于教师拓展思路、更新知识,实现教学相长.     

被测量系统畸变的高压冲击波的数值校正

在冲击电压测量中,利用测到的输出电压波形和测量系统的方波响应来重建高压侧的输入电压波形是有价值的。本文采用曲线拟合的方法得到方波响应的方程,并采用三弯矩样条函数求得输出电压波形的一阶、二阶导数,从而提高了数值校正的准确度。本文还给出了一些例子,包括一个1.2MV冲击电阻分压器系统的实验和计算结果比较。它们表明重建的吻合程度是令人满意的。     

System Design Projects for Seniors

The use of system design projects in the education of senior engineering students is discussed. In an experiment with such a project at the University of Iowa, students learned many technical and human lessons by partitioning the assigned class project into small subsystem problems, designing and building the subsystems, solving the interface problems, and testing the overall project. This kind of system experience is a natural extension of the typical freshman design course in which students learn to solve problems in groups. Here the more sophistocated skills of the seniors are incorporated into the individual group designs, and there is the additional incentive of maidng the individual projects work together to achieve a goal common to the entire class.     

A systematic approach to the implementation of final year projectin an electrical engineering undergraduate course

This paper describes a computerized management system for the processing of a final year project in an electrical engineering undergraduate course including a structured project allocation to students, a comprehensive assessment procedure, an automated processing of marks, and a management supporting system. An optical reader is used to scan the project selection made by all the students, and the allocation algorithm allocates as many projects as possible in meeting the students' preferences. A new attempt using a grading category index for each assessment criterion is implemented and the assessment of the student's performance is evaluated through five main components with 31 assessment criteria. The marks for each student are scanned by an optical reader and calculated by a weighted linear conversion of all the grading category indexes. The assessment system is more valid as it has many specific criteria and is more reliable as the process is consistent. The management supporting tools and experiences in handling very large groups of students especially in the maintenance of a uniform marking standard to all the students are highlighted. It is hoped that some of our approaches can be selectively adopted for undergraduate course work on continuous assessment even for a smaller student population     

Noise and Interferences in Electrical Networks-An Undergraduate Experiment

The topic of noise and interferences in electrical networks is seldom discussed at the sophomore or junior levels. Electrical Engineering students, however, may encounter interference problems in their first laboratory course. Practical techniques of noise minimization in measurement setups are usually considered a work of art rather than a topic that can be methodically introduced. This paper describes a laboratory experiment investigating noise sources and their elimination that requires only inexpensive and generally available instrumentation. Background material is presented in a simplified manner taking into consideration the fact that the students at this level have not been exposed to probability and advanced electromagnetic theories. The experiment concentrates on the environmental noise and the various techniques to reduce the coupling between the system and noise sources. A brief introduction to noisy signal detection techniques is also included.     

Development of a 16-bit microprogrammable computer as a seniorcourse project: a teamwork approach to engineering education

The authors describe an educational experiment in computer engineering at the University of Washington. Eight senior students work together to design and fabricate a 16-bit general-purpose microprogrammable computer system and support software. The project was developed in a capstone hardware design course in electrical engineering. In parallel with other demands of the course, students collaborated on such tasks as architectural specification and research, design and wirewrapping, and testing of the system     

An Attempt to Establish and Maintain Standards in a Large Course

This paper describes an experiment in establishing and maintaining standards for a large course and assigning grades based on those standards The continuing experiment began in the spring of 1971 and has included some thirty instructors and more than 4000 students in an introductory computer science course. Some of the experience, both positive and negative, is reported for those interested in trying such a scheme.     

基于虚拟仪器技术的工频X线机单元电路实验系统的设计

为了提高工频X线机电路实验教学的开放性和解决实验设备费用高、易损坏、更新慢等问题,研究并开发一套教学使用的工频X线机单元电路实验仿真系统,可以完成工频X线机电路实验课程的基本教学任务。结合工频X线机电路实验教学课程的需求,以工频X线机典型的单元电路为例,采用电路仿真软件Multisim仿真实验电路,虚拟仪器开发软件LabVIEW进行实验系统界面设计,并利用接口技术实现二者之间的通信联结,完成工频X线机单元电路实验系统的构建。设计完成后的实验系统能够仿真实际X线机单元电路的工作过程,学生可以在理论学习的基础上,利用此套系统进行X线机整流电路、限时电路、空间电荷补偿电路、容量保护电路、旋转阳极启动、延时及保护电路的实验。测试结果表明,该实验系统可以完成工频X线机单元电路实验课程中的电路参数测量、电路信号测试及参数显示任务,通过与真实单元电路实验箱的对比,证明了实验结果可以反映出真实的X线机球管电气特性。该实验系统有效地增加了学生的动手实践机会,可扩展性强,有利于探究性电路实验的进行,因此,将虚拟仪器技术用于设计和实现工频X线机单元电路实验系统是一种非常有效的方式,既解决了实验设备不足的问题,也为其他医学影像设备电路实验仪器的设计和研制提供新的思路。     

Introducing software engineering developments to a classical operating systems course

An operating system course draws from a well-defined fundamental theory, but one needs to consider how more recent advances, not necessarily in the theory itself, can be applied to improve the course and the general body of knowledge of the student. The goal of This work is to show how recent software engineering developments can be introduced to such a course to not only satisfy the theory requirements, but also make the theory more understandable. In particular, This work focuses on how students can effectively learn the Unified Modeling Language, the object-oriented methodology, and the Java programming language in the context of an operating systems course. The goal is to form a systematic software engineering process for operating system design and implementation.     

C语言实验教学环节的改进与探索

C语言程序设计是一门实践性较强的课程,实验教学是其教学中的重要组成部分,目的是让学生在实验中动脑动手、积极练习,领悟编程精髓,提高分析问题、解决问题的能力。本文在总结了目前高校C语言实验教学中普遍存在的问题的基础上,提出了适合当前教学环境的、更为合理的C语言实验教学环节的改进方案,对解决实验教学中存在的问题、提高教学效果有着重要的意义。