3GPP W-CDMA systems: design and testing

Newly emerging wireless signal formats can present significant design challenges to the system design engineer. Wideband code division multiple access (W-CDMA) can present many engineering design and verification challenges, due to its physical layer complexity as well as complexities that can arise when integrating RF and baseband designs to achieve a working system. System design engineers typically have the task of interpreting standards specifications, first for partitioning subsystem requirements, then verifying that the end-to-end system design (typically including both baseband and RF designs) will meet specifications when they are finally integrated. This article considers a case study that illustrates the importance of simulating baseband and RF designs together to accomplish this task. Specifically, a conceptual system design that includes system models, a fixed-point finite impulse response filter, and transistor-level circuit design is simulated and verified together against measurements defined in the third-generation partnership project (3GPP) W-CDMA standards specifications. Tradeoffs between improving either the RF or baseband design to meet overall system specifications will be discussed. Finally, design verification using "connected solutions," or connectivity between, electronic design automation software and test equipment will be described, illustrating how verification testing can be started earlier to help reduce risk by identifying performance issues early in the design cycle, when they are potentially easier and costly to implement     

继电器的集成式智能化设计系统的研究

将人工智能技术、专家系统技术、CAD技术、三维造型技术、工程分析技术、优化技术等现代设计技术集于一体,开发了继电器产品的集成式智能化设计系统。该系统可根据用户要求,完成产品的概念设计、结构设计、特性分析、电磁场分析计算和结构优化等不同设计阶段的设计任务,并对设计方案给予综合评价。着重研究了用于描述继电器总体结构和零部件已知结构的知识表示方法。     

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.     

工程图形多媒体教学软件的研究与开发

针对目前工程制图教学和学习过程界存在的问题,提出利用多媒体技术制作和开发工程图形的多媒体CAI课件的方法,并设计了一个基于网络的多媒体练习系统。文中介绍了课件的内容选择、脚本的设计思想和多媒体素材的采集工作。     

Free- and Open-Source Software for a Course on Network Management: Authoring and Enactment of Scripts Based on Collaborative Learning Strategies

This paper describes a computer-supported collaborative learning (CSCL) case study in engineering education carried out within the context of a network management course. The case study shows that the use of two computing tools developed by the authors and based on free-and open-source software (FOSS) provide significant educational benefits over traditional engineering pedagogical approaches in terms of both concepts and engineering competencies acquisition. The Collage authoring tool guides and supports the course teacher in the process of authoring computer-interpretable representations (using the IMS learning design standard notation) of effective collaborative pedagogical designs. Besides, the Gridcole system supports the enactment of that design by guiding the students throughout the prescribed sequence of learning activities. The paper introduces the goals and context of the case study, elaborates on how Collage and Gridcole were employed, describes the applied evaluation methodology, and discusses the most significant findings derived from the case study.     

高压架空输电线路自动巡线机器人的研制

介绍了自行研制的110kV高压架空输电线路巡线机器人。该机器人机械结构设计合理、巧妙;控制系统采用两级分布式计算机控制结构,规划级用于机器人管理和路径规划,直接控制级用于机器人的姿态和运动控制。实验线路上的运行表明,较好地解决了自主越障问题,可以完成规定的巡检任务,具有非常广泛的应用前景。     

高速DSP系统PCB板可靠性设计

本文介绍了高速DSP系统PCB板的特点以及可靠性设计应注意的几个问题,包括电源设计、软硬件抗干扰设计、电磁兼容性设计、散热设计以及高速电路重要信号线的布线方法,使各项设计更加合理,易于工程实现。     

一种基于Avalon总线PCI从设备IP核设计

在工程实践中,如何实现上位机与Qsys系统之间的无缝链接,一直是设计中的重点。针对以上问题,本文提出了基于Avalon总线的PCI从设备IP核的设计方法,以嵌入式IP软核的形式取代原有专用接口芯片。设计按照自顶而下设计流程,首先给出了PCI从设备的RTL级模块划分,并详细设计了其mealy型状态机,然后将Avalon总线与PCI总线实现片内互联,最终开发了一个具有自主知识产权的IP软核。该IP核符合PCI 2.2标准,可进行资源自动配置,实现数据正确读写,还实现了PCI总线与Nios II处理器之间的数据传输,验证了该设计的正确性和可行性。     

An electrical engineering design course sequence using a top-downdesign methodology

A sequence of two courses (second term of third (junior) year and both terms of fourth (senior) year) has been developed to introduce students to a structured approach to design. The first course includes lecture-style presentation of the top-down, step-wise refinement, design methodology. Realistic documentation and client/consultant communication is fostered as well as the design, fabrication, and testing of a prototype. In the senior-year course, students divide into teams of three members to undertake a single design problem, with individual faculty members acting as “clients”. A more complete sequence of the top-down design process is undertaken in these senior-year projects. Documentation is required at each stage of the design sequence to ensure compliance with the client/team “contract”. Introduction of a formal design process, including time management, has resulted in an increased “success” rate in the final designs and in more complex problems being proposed by the “clients” than had previously been experienced     

A novel course on microwave monolithic integrated circuit design, theory, and characterization

A novel course conducted for the past three years at the National University of Singapore is described. The course design projects introduce students to microwave monolithic integrated circuit (MMIC) component and subsystem design and expose them to modern computer-aided design (CAD) tools, industry standard test equipment, and procedures. In addition, since the proposed topics are industry-collaborated research projects, students gain new enthusiasm for the circuit design and directly see the importance and relevance in the engineering field. In contrast to the available MMIC courses conducted in the other universities or organizations, these students are given the complete freedom to implement the hardware within a fixed time frame. Implementation of these MMIC circuitries using external foundries, such as United Monolithic Semi-conductor (UMS), Philips Microwave Limeil (PML), and Triquint, has proven to be highly motivational and educational and, eventually, has led to increased enrollments in other higher level electromagnetic and microwave circuit modules.     

Development of a mobile spreadsheet-based PID control simulation system

The use of the electronic spreadsheet as a modeling and simulation tool in the engineering fields is increasingly popular with an increasing number of tertiary institutions, including spreadsheet as a teaching resource in the core curriculum of these fields. Concurrently, the dramatic improvement in Internet speed allows certain course material to be delivered online, facilitating electronic-learning (E-learning). E-learning frees students from the restriction of time, although they are still largely constrained by space to the nearest wired computer. However, the boundary of computing has expanded with the advance in wireless communication; now numerous handheld mobile devices (e.g., personal digital assistants (PDAs) and cellular phones) are available that will allow computing to be accomplished on the move. In turn, this wireless trend has contributed to move E-learning toward mobile learning (M-learning). Based on the previously mentioned trends, this paper presents the development, implementation, and evaluation of a mobile spreadsheet-based Proportional, Integral, Derivative (PID) control simulation system that aims to enhance the learning of the student in the field of control engineering. The system has been used in an industrial control system course at the National University of Singapore (NUS), Singapore. The mobile spreadsheet system developed is able to work with most handheld mobile devices, including the cellular phone. The methods and difficulties (e.g., limited storage space and small screen display of a cellular phone) involved in the development of the system will be duly discussed. Feedback from students that is used to assess the usefulness of the system will be released to share the benefits of such an M-learning system.     

Team Design in the Classroom-A Case Study

This paper describes how the team approach has been applied to a design course taken by electrical engineering juniors. Course mechanics, project selection, team organization, system itnplementation, problems, and outcome are discussed.     

万家寨大坝变形监测改造设计

介绍了万家寨水库大坝变形监测改造项目的设置、变形监测改造的思路及过程、自动化监测系统的设计等。改造后的变形监测子系统形成完整统一的系统。     

双电源复合励磁稀土永磁同步发电系统的研究

研究了一种新型双电源输出的复合励磁稀土永磁同步发电系统.该系统包括双电源发电机子系统、励磁调节子系统和保护及监控子系统.重点论述系统的运行原理及软、硬件设计,并通过实验表明,该发电系统具有稳定性好和可靠性高等特点.     

基于GPRS的机车实时监测系统

GPRS(通用分组无线电业务)由于其流量计费、高速传输等特点,正越来越广泛地用于车载监控、电力抄表、气象监测等行业的远程数据传输.本文介绍一种基于GPRS无线通信网络的机车实时监测系统,给出该系统的总体结构以及各单元的主要功能,阐述GPRS在机车无线监测系统中的优势.通过GPRS网络实现车载子系统与地面监测中心之间的通信.该系统已投入实际运行,并取得了良好的效果.     

基于蓝牙通讯的智能家居红外控制系统的实现

蓝牙技术作为一种在2.4GHz无线基础上新发展起来的电缆置换技术,由于其全球统一的标准性、数据传输方面的优越性、自动组网能力、低功耗、低成本和高安全性等特点,已经得到广泛认同.使用蓝牙技术实现家中各个房间之间的通讯,用红外技术实现对家中各种红外家电的统一红外控制,两种技术相结合构建智能家电控制系统,通过蓝牙红外中继器控...     

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.     

基于GSM无线通信系统提高通信成功率的途径

以负荷控制系统通信子系统的开发成果为基础,概要介绍了电力抄表/负荷控制系统所使用的GSM通信网络,针对当前抄表/负荷控制无线通信成功率不高的情况,从产品设计、工程施工和售后维护3个方面提供了完整的解决方案.