CEDA Currents

This newsletter covers news, research, and events related to the IEEE Council on Electronic Design Automation.     

CEDA Currents

This newsletter covers news, research, and events related to the IEEE Council on Electronic Design Automation.     

CEDA Currents

Among this month's CEDA Currents newsletter items are awards—the EDAC Kaufman Award, ICCAD and VLSI-SoC Best Paper Awards, and Early Career Award—the IEEE Embedded Systems Letters' most-accessed articles, and upcoming CEDA events.     

CEDA Currents [includes new IEEE Fellows]

This newsletter covers news, research, and events related to the IEEE Council on Electronic Design Automation. One item announces that two people nominated by CEDA were part of the 2009 class of IEEE fellows.     

Currents

The Google Web Toolkit's public debut and rapid maturing have brought attention to the myriad tools and frameworks for facilitating Web applications, particularly those written with Ajax Asynchronous JavaScript and XML. GWT's debut had significance for the industry far beyond Google itself. It was a lot like what Google Maps did for Ajax technology in general; it legitimized the idea of an Ajax component framework and made Ajax frameworks more visible. It is widely believed that GWT's debut signals a new era of visibility for Ajax frameworks     

Currents in connectionism

This paper reviews four significant advances on the feedforward architecture that has dominated discussions of connectionism. The first involves introducing modularity into networks by employing procedures whereby different networks learn to perform different components of a task, and a Gating Network determines which network is best equiped to respond to a given input. The second consists in the use of recurrent inputs whereby information from a previous cycle of processing is made available on later cycles. The third development involves developing compressed representations of strings in which there is no longer an explicit encoding of the components but where information about the structure of the original string can be recovered and so is present functionally. The final advance entails using connectionist learning procedures not just to change weights in networks but to change the patterns used as inputs to the network. These advances significantly increase the usefulness of connectionist networks for modeling human cognitive performance by, among other things, providing tools for explaining the productivity and systematicity of some mental activities, and developing representations that are sensitive to the content they are to represent.A version of this paper was the invited address at the first annual conference of the Society for Machines and Mentality in December, 1991. A related version was presented at the Computers and Philosophy Conference in August, 1992. I am extremely grateful to Adele Abrahamsen for her numerous suggestions and comments on various drafts of this paper.     

Currents: Trends, People, Projects

Along with the more public debate about the benefits the Semantic Web is - or isn't - delivering to the Internet, a related undercurrent of discussion is growing about software engineering's future. In the vanguard of this discussion, some researchers and software engineers are advocating that Semantic Web technologies should be key components of the next paradigm of software development. These advocates, however, are discovering that the ongoing debate about the Semantic Web's ultimate usefulness is being fought over the user experience - whether or not the principles behind the Semantic Web are just too complex to be truly useful to the bulk of Internet users.     

网络化杂散电流检测仪设计

针对杂散电流的产生、危害及其检测原理的分析,提出了以单片机为核心的网络化杂散电流检测仪的设计。详细讨论了检测仪的信号调理电路、存储和显示电路、时钟电路及CAN总线接口电路设计和软件设计。该系统通过CAN总线,实现对杂散电流的网络化检测。     

PWM整流器电流控制策略仿真比较

通过分析三相电压型PWM整流器的数学模型,建立了PWM整流器的数学模型,根据同步电动机励磁系统主回路中PWM整流电路不同的调制方法,介绍了SPWM电流控制,滞环电流控制和空间矢量控制的基本原理和三种不同控制方法下的触发方式。在MATLAB的SIUMLINK环境下对三种控制方法建立仿真模型,并对仿真结果进行了分析比较,结果表明,在空间矢量控制方法下整流器直流侧电压利用率高,降低了谐波污染,使系统更接近单位功率因数运行,从而使电机运行更加稳定,运行精度更高。     

谐波电流检测电路的仿真研究

分析了基于瞬时无功功率理论的谐波电流检测原理 ,用LabVIEW虚拟仪器建立了相应的仿真电路 ,并对其检测结果进行分析研究。     

水下滑翔机海洋环境深平均流估计方法

提出了水下滑翔机海洋环境深平均流估计方法．首先,基于水下滑翔机稳态运动模型,研究海水密度差异和耐压舱体压缩变形对水下滑翔机运动速度的影响,建立水下滑翔机运动速度快速计算模型,并证明了该模型的正确性及有效性．然后,利用得到的水下滑翔机运动速度和船位推算方法结合,给出了海洋环境深平均流估算方法．利用该深平均流估算方法对3台水下滑翔机海上试验过程中的深平均流进行估算,并分析了估算结果的有效性．实验结果证明利用本文得到的深平均流可以提高水下滑翔机船位推算中的定位精度．     

利用霍尔传感器设计直流电流检测电路

利用集成UGN-350lM霍尔传感器和集成AD522型双端差动输入测量放大嚣设计出了直流电流检测电路．该电路具有良好的线性度(绝对线性度为1．4％)和高精度(最大相对误差为0．53％)；电路结构简单等特点。实验结果令人满意。     

Modeling Rogowski Coils for Monitoring Surge Arrester Discharge Currents

Rogowski coils (RCs) are widely used to measure power or high frequency currents based on their design. In this paper, two types of RCs that are circular (traditional) and cylindrical shapes wound using wire covered by varnish are constructed. This construction is carried out to be suitable for monitoring the discharge current of the surge arrester installed in the distribution system. Concerning high frequency RC modeling for both types considering transfer function is introduced. Self-integrating for both types is attained. Therefore, the experimental tests using function generator for both coils are carried out to identify the parameters of the transfer function representing the introduced model. The measured signals for current and induced voltages are denoised for the parameter identification process. The denoised process is achieved using the MATLAB code ‘wdenoise’ while the parameters are estimated using the system identification toolbox. Verification of the proposed model is achieved using experimental results for the two coils. The sensitivity of the two coils is investigated based on the induced output voltage. The application concerning the two coils for monitoring the discharge current of the surge arrester is done. The results confirm the accuracy of the introduced RC model, as well as the performance of the cylindrical shape, is better than the traditional one. The simulation is carried out using MATLAB and ATPDraw programs.     

硅整流装置均流的分析与探讨

本文从理论上通过分析晶闸管的物理机理，再通过采用脉冲工作方式进行试验分析，时额定通态电流状态下的均流系数进行冷、热态的对比分析与探讨。最后针时电力机车硅整流装置均流系数的测试提出一补偿方案。     

无刷励磁发电机转子电流及温度监测装置

介绍了一个新颖的无刷励磁发电机转子电流及温度监测装置的总体结构、设计思想和关键技术。该装置对发电机转子运行状态的在线监测和故障诊断具有重要作用。模拟试验表明 ,该装置运行安全可靠 ,性能优良