A Look at the New Electrical Engineering Laboratory Program at the Hopkins

The undergraduate electrical engineering program at The Johns Hopkins University has undergone extensive revision. The most striking revision has been in the laboratory program. Laboratory courses which are distinct from the lecture courses have been developed. These laboratory courses embrace the fields of basic and advanced electrical measurements, transducers, passive circuits, active networks, communications, microwaves, materials, computers, servomechanisms, and energy conversion. The experiments in each one of these fields are designed to give the student insight into both the basic and advanced concepts involved. The sequence of presentation of the experiments is chosen to allow the most complete coverage of a subject as possible, based on the order in which the electrical engineering lecture courses are taken. The use of laboratory manuals, notebooks, reports, and examinations has been given careful thought and some significant ideas have been evolved with regard to their use in establishing a successful laboratory course.     

Circuit Theory in a Unified Curriculum

Conventional circuit analysis courses are generally taught by electrical engineering instructors in a proprietary fashion. The underlying reasons for this state of affairs are history and utility; circuit theory was developed from a consideration of electric circuits and found its most important area of application there. Intrinsically, however, circuit theory is no more "electrical" than arithmetic is "financial." This paper explains the basis for an abstract circuit course "abstract" in the sense that the circuit connotation is not necessarily electrical but may, with equal validity, be mechanical, acoustical, thermal, etc. Generalized circuit variables are classed as either potential or flow variables, and generalized circuit parameters are then categorized according to their behavioral equations (Hooke's Law, Ohm's Law, Fourier's Law, etc.). A simple systematic method of finding a circuit diagram for a system composed of such parameters is shown.     

Energy Conversion and Control at Berkeley

The recent developments in this area in terms of curricular changes in the Electrical Engineering program have been described and evaluated. A previous required course, which covered electric machinery in some detail, has been replaced by a more general course which studies the principles of electromechanical energy conversion and the control of the flow of electrical energy by both static and motional devices. In addition, a new experimental two-semester course has been developed which integrates the study of energy conversion and control devices into a study of systems and the role of these devices in meeting system specifications.     

Multisim8．0在电路分析中的应用

在电路分析课程中引入虚拟仿真软件,对一些较复杂的电路和定律进行虚拟仿真,既方便又直观,使学生更加容易理解这些抽象的理论内容,从而提高学生学习电路分析课程的兴趣和效果。     

EDA技术在数字集成电路后端实验教学改革中应用

集成电路技术的飞速发展,对数字集成电路后端课程的教学方法和手段提出新的要求。为适应这种要求,提出将现代电子设计自动化(EDA)技术纳入教学实践全过程的新思路。基于数字集成电路的理论和方法,针对集成电路后端设计及其工程实践课程前期教学存在的不足,通过引入EDA技术的方式对改善课程和实验教学效果进行探讨。近几年的教学实践表明,应用EDA技术对数字集成电路后端实验课程教学进行改革,对激发学生的学习兴趣起到积极作用,同时还可加深学生对基本概念的理解和提高学生集成电路设计的动手能力。     

Squishing Circuits: Circuitry Learning with Electronics and Playdough in Early Childhood

While circuitry lessons have traditionally been first introduced in late elementary school, they remain challenging conceptually for undergraduates in physics and engineering courses. Seeking to provide a higher quality and earlier introduction to circuitry learning for young children (ages 3–5), this paper investigates the affordances of utilizing the Squishy Circuits toolkit, a circuitry kit that combines circuit components and playdough, as a first introduction. Our study engaged 45 children across three nursery school classrooms in open-ended play with Squishy Circuits toolkits for seven sessions over a period of 2 weeks. Here, we focus on six children in one focal classroom in order to illustrate the concepts that children are developing during play and open exploration with the kits and a range of crafting materials. Findings indicated that the Squishy Circuits toolkit enabled children to explore concepts important to circuitry learning, including current flow, polarity, and connections. Additionally, analysis of whole class conversations before and after the circuitry explorations indicated significant gains in children’s ability to discuss circuitry concepts over the course of the study. Through individual case studies, we illustrate how children enacted these concepts through their play and how the transparency afforded by the toolkit make the big ideas of circuitry visible. This work serves to illustrate how very young children can successfully begin to engage with science topics commonly introduced in later elementary school when those topics are framed through play and discovery with transparent and malleable materials.

     

System Theory in a Unified Curriculum

The incessant search for unifying concepts in engineering education has, in recent times, stepped up its pace to match the tempo of our scientific and technological progress. Although a single unified curriculum for all engineering problems would indeed be a utopia, there is hope, nevertheless, that certain apparently diverse areas of engineering can be regrouped with emphasis on the basic disciplines underlying them. System theory, which is briefly exposed here, is one such fundamental discipline with its mainsprings in the mathematical model of linear-graph theory. The chief assertion of this paper is that system theory could very well serve as a basis for unifying the areas of 1) circuit theory, 2) circuit aspects of electronics, 3) rotating machinery, 4) elementary statics and dynamics, and 5) system analysis. The ideas presented here are sufficiently supported by the authors' classroom experiences. In the light of the curriculum proposed, certain of the inevitable implications for Canadian electrical engineering are discussed.     

集成运放线性应用电路分析方法的研究

集成运放的线性应用在电子工程系统电路中经常被使用,掌握运放线性应用电路的分析方法十分重要。通过研究运放线性应用电路的常用分析方法,即基本分析法、叠加原理分析法、灵活分析法等,并加以运用,可以很容易的对各种复杂运放线性应用电路进行分析,从而得知电路的功能。     

THE EQUIVALENT CIRCUIT AND CONTROL SYSTEM OF TRAVELLING WAVE TYPE ULTRASONIC MOTOR

从压电振子的等效电路出发，得到了行波型超声波电动机定子环乃至整个电动机的等效电路．分别对电机控制系统各组成部分进行了分析，并利用电机等效电路达到简化控制系统的目的．实验对研究结果进行了验证．     

面向未来的“电路”课程教学改革与实践

在创新教育的背景下,针对高等教育面临的共性矛盾,中国矿业大学电路课程教学改革基于系统分析法的教学思想,深化与工程背景和工程实践的结合,促进电路理论课程教学的多样化,加强计算机仿真技术在电路教学中的应用,构建了全方位的面向未来的电路课程教学改革与实践。     

模拟电子技术实验中的几个误区与问题分析

提出了电子技术基础实验过程中出现的一些误区，分析了实验中的一些实际问题。学生在初做实验阶段往往由于对设备和实际电路不熟，理论与实际不能很好地联系，实验中会出现一些误区，导致结果错误，甚至烧毁元件和电路，使实验无法进行。元器件的应用若不联系实际情况，电路也会出现异常。各种潜在因素都在影响着每个实验。分析和处理好这些误区和问题，才能使学生用好理论知识，不断提高实际动手能力。     

Being constructive: An alternative approach to the teaching of introductory ideas in electricity

This paper reports on the development and implementation of an introductory course on electric circuits based on a constructivist model of curriculum development and teaching. Pupil interviews before instruction explored and clarified the range of children's existing ideas and conceptions. A teaching sequence was designed to elicit pupils’ ideas, to challenge these experimentally where they differed from accepted scientific ideas and to encourage discussion and reformulation of ideas. Post‐instruction interviews showed improved pupil understanding of several important basic concepts. The constructivist approach appeared to provide a viable and satisfactory basis for teachers’ classroom decision‐making and for the structuring and sequencing of activities as the course progressed.     

基于建构主义的数学概念转变学习

概念转变学习是学生原有概念的改变、发展和重建,是学生的前概念向科学概念的转变.日常概念、概念意象、迁移等因素是数学概念转变学习中产生错误概念的主要原因.根据概念转变的途径、机制和条件理论,概念转变学习的教学策略:(1)了解学生已有知识经验,促进日常概念向科学的数学概念转变;(2)引发认知冲突,辨清新旧界限以实现数学概念转变学习;(3)重视概念生成的凝聚,构建概念网络.     

基于ARM9和CS8900A的网络通信电路的设计及实现

介绍一种基于ARM9微处理器s3C2440A的嵌入式网络通信接口电路,该电路采用以太网控制芯片cs8900A实现了网络的互联。给出了硬件电路的设计和软件的设计思路,该设计方案具有硬件电路简捷、成本低、性能可靠等特点。     

Teaching Design in Middle-School: Instructors’ Concerns and Scaffolding Strategies

This study deals with engineering education in the middle-school level. Its focus is instructors’ concerns in teaching design, as well as scaffolding strategies that can help teachers deal with these concerns. Through participatory action research, nine instructors engaged in a process of development and instruction of a curriculum about energy along with engineering design. A 50-h curriculum was piloted during a summer camp for 38 middle-school students. Data was collected through instructors’ materials: observation field notes, daily reflections and post-camp discussions. In addition, students’ artifacts and planning graphical models were collected in order to explore how instructors’ concerns were aligned with students’ learning. Findings indicate three main tensions that reflect instructors’ main concerns: how to provide sufficient scaffolding yet encourage creativity, how to scaffold hands-on experiences that promote mindful planning, and how to scaffold students’ modeling practices. Pedagogical strategies for teaching design that developed through this work are described, as well as the ways they address the National Research Council (A framework for K-12 science education: practices, crosscutting concepts, and core ideas. National Academies Press, Washington, DC, 2011) core ideas of engineering education and the International Technological Literacy standards (ITEA in Standards for technological literacy, 3rd edn. International Technology education Association, Reston, VA, 2007).     

基于Matlab的电工电子技术虚拟实验仿真平台

本文将Matlab引入电工电子技术课程的教学和实验中,通过Matlab软件提供的电气系统工具箱,可以对直流电路进行稳态分析、暂态分析;同时该软件也可以对交流电路进行分析。通过教学实践表明,基于Matlab的电工电子技术虚拟实验仿真平台的建立和应用,改革了电工电子技术课程实验教学的形式和内容,培养了学生的兴趣和实践能力,提高了课堂教学的效率。     

自动装配生产线教学演示系统设计研制

在对国内外同类系统进行分析研究的基础上，结合自动化装配实际工程设计方法，设计研制了一套集多种自动化装配过程于一体的自动化生产线教学演示系统，可用于机电类专业多门课程的教学与实训，为后序开发生产机电一体化，自动装配生产线等领域的教学系统奠定了基础。     

协作式网络课程设计

随着计算机网络等通信技术的发展和教育观念的革新,网络教育已经成为当代教育领域中的一个研究热点。网络课程作为网络教育的核心资源也取得了不少成就,但网络课程并没有实现预期的效果,究其原因主要是忽视了社会性交往因素的设计。以协作学习理论为指导,探讨协作式网络课程理念及设计原则,可以对网络课程设计起到指导作用。     

面向工程教育的电工学实验教学改革方法初探

利用工程教育平台,结合虚拟现实技术对电工学实验教学进行了有益的探索实践研究。该方法编程简单,直观性强,通过编程实例来引导学生进行电工学实验。经过课堂实训,最后学生可以独立自主开展课外课程设计。实践证明,该方法是一种有效的电工学教学辅助手段。     

信号与系统分析课程实验教学改革探索

依托电子电路国家级实验教学示范中心平台,从优化实验内容、创新教学方法、推行综合评价、开发网络学习平台等方面对该课程的实验教学进行改革探索,促进学生对课程概念、原理和分析方法的理解和应用,增强学生的实践动手能力和创新能力.