Proceedings of the 1990 IEEE Colloquium in South America

Aug. 31 1990-Sept. 15 1990

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  • Proceedings of the 1990 IEEE Colloquium in South America (Cat. No.90TH0344-2)

    Publication Year: 1990
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    Freely Available from IEEE
  • Biomechanical assessment techniques in rehabilitation

    Publication Year: 1990, Page(s):31 - 34
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A set of quantitative instruments has been developed for monitoring the surgical and rehabilitative progress of children and adolescents with cerebral palsy. The set includes biomechanical devices, electrophysiological equipment, and automated clinical test series, and functional assessment instrumentation. Data from the multiple tests is accessed through a centralized data base management system.... View full abstract»

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  • Microelectrode arrays: structures and applications

    Publication Year: 1990, Page(s):28 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The rapidly advancing technology of microelectronics is being employed by several research groups to develop microelectrode arrays for use in life science research. The authors review the development of microelectrodes using silicon-based technology over the last decade. Silicon-based technology is applied to micromachine structures that are used as substrates for electrode arrays. The resulting m... View full abstract»

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  • Maximum likelihood estimator image reconstruction for emission tomography in nuclear medicine

    Publication Year: 1990, Page(s):119 - 125
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Emission tomography is a technique which allows the three-dimensional representation of radioisotope labelled chemical compounds that have been inroduced into the human body for the purpose of studying metabolic processes, for the detection of tumors and/or the diagnosis of a variety of diseases. There are two principal methodologies: single photon emission tomography (SPET) and positron emission ... View full abstract»

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  • A microcomputer-based system for mapping EEG signals after source derivation

    Publication Year: 1990, Page(s):22 - 27
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    The EEG (electroencephalogram) data are obtained as a set of up to 16 unipolar derivations, sampled and displayed in real time, before storing on disk. The source derivation technique counteracts the smearing of the electrical fields as measured on the scalp and thus improves the spatial selectivity of mapping. It is calculated using the finite difference method, assuming a uniform grid of electro... View full abstract»

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  • Pre-reconstruction restoration versus post-reconstruction restoration of single photon emission computed tomography images

    Publication Year: 1990, Page(s):115 - 118
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    Restoration of single photon emission computer tomography (SPECT) images may be performed either before reconstruction (pre-reconstruction restoration) or after reconstruction (post-reconstruction restoration) from planar (projection) images. The authors present a comparison of results obtained by these two methods. The filters investigated in this study are the Wiener and power spectrum equalizat... View full abstract»

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  • Engineering project management system for large and/or many small projects

    Publication Year: 1990, Page(s):93 - 95
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A special software package to manage the engineering staff of a project of 500 technical persons and additional smaller projects totalling an additional 500 engineering persons was put in place at a large defense manufacturer's plant manufacturing military vehicles. The manufacturing art of the project was not originally included in the system. The theory of the management system and the events oc... View full abstract»

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  • Introduction to neutral networks and their application to control systems

    Publication Year: 1990, Page(s):213 - 216
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The author presents an introduction to the use of artificial neural networks and gives some explanations of how they might be applied to control systems View full abstract»

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  • Permutation codes, (d,k) codes and magnetic recording

    Publication Year: 1990, Page(s):59 - 61
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    Permutation codes are a class of error correction codes which have been suggested for use on the Gaussian channel. Runlength limited (d,k) codes, a class of modulation codes, are used to decrease intersymbol interference in a peak detection recording channel. The author suggests a method whereby these two classes of codes can be combined to improve the reliability (or density) in a peak detection ... View full abstract»

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  • `Excellence against all odds'-Canada's electric utilities triumph over distance, topography and weather

    Publication Year: 1990, Page(s):137 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Canada is the second largest country in the world in terms of geographical boundaries. Located between latitude 49° north and the North Pole, Canada stretches from east to west, across 5 1/2 time zones, a distance of 7500 kilometers. These tremendous distances and the variations in topography and weather have provided a formidable challenge for Canadian electric power utilities as they seek to... View full abstract»

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  • The use of neural networks in optimization problems in communication networks

    Publication Year: 1990, Page(s):66 - 67
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The authors outline how Hopfield Neural Networks can be used to solve combinatorial optimization problems that arise in the design of radio networks View full abstract»

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  • Signal averaging in stress test and Holter systems

    Publication Year: 1990, Page(s):16 - 21
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A signal averaging technique is presented as a high quality alternative for filtering and cleaning ECG signals. A basic mathematical approach is first presented, with emphasis on the bandwidth reduction due to imperfect synchronism, when the QRS complex and R wave peak are used for synchronizing and alignment. A very reliable method is presented, especially designed for noisy ECG signals; in this ... View full abstract»

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  • Emitter drive: a technique to drive a bipolar power transistor switching at 100 kHz

    Publication Year: 1990, Page(s):188 - 192
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Theoretical support and experimental results concerning the application of an emitter driven bipolar power transistor to a 400 V 10 A power switch are presented. The central idea of the emitter drive is to turn off and on the bipolar transistor controlling the flow of the emitter current, using another switch. This switch was implemented with a low voltage power MOSFET. In this way it is possible ... View full abstract»

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  • Six models for technology managers

    Publication Year: 1990, Page(s):107 - 112
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    The author gives six perspectives on the environment of engineering management. It is addressed to engineers seeking to make the transition to management, whether as entrepreneurs or as members of structured organizations, and to managers at all levels who want to gt the job done effectively. The first model describes the evolution of a manager from an engineer; the second, the evolution of a tech... View full abstract»

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  • Recent trends in reliability of large industrial power systems

    Publication Year: 1990, Page(s):145 - 149
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The author stresses the challenges and complexities facing an engineer when designing a new facility or retrofitting an existing industrial power system. Industrial facilities are making more efficient use of their energy from all sources, with cogeneration being prevalent, as plants generate electricity for self-consumption and for sale to utilities. Inverter systems for uninterruptible power sup... View full abstract»

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  • Using computer-generated graphics to make engineering documents and presentations more effective

    Publication Year: 1990, Page(s):89 - 90
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    The author explains how computer-generated graphics can be integrated into text to produce effective and persuasive technical reports and presentations. Integrating graphics into text allows the graphics to be proportioned so that the illustration appears on the same page with the text describing the graphics. When text and graphics appear on the same page, the reader follows the explanation of th... View full abstract»

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  • Task planning for flexible manufacturing systems

    Publication Year: 1990, Page(s):209 - 212
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The design and implementation of flexible manufacturing systems require the planning of task requirements to meet standards of reliability, cost, and throughput over a family of products. Tools for computer-aided engineering of manufacturing systems utilize automated planning and representation methods to enhance the capability of engineers to design better systems. Automated assembly sequence pla... View full abstract»

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  • Applications of neural networks in biomedical engineering

    Publication Year: 1990, Page(s):7 - 12
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The author presents an iterative optimization procedure to achieve the goals of furthering the understanding of brain functions so that an artificial visual system can be built. The applications of these algorithms are almost unlimited. Examples are presented in visual evoked potentials, pattern recognition and real time reduction of motion artifacts View full abstract»

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  • Asynchronous bidirectional direct frequency converter controlled by space vectors

    Publication Year: 1990, Page(s):177 - 183
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A novel direct frequency convertor (DFC) structure is presented. The proposed DFC exhibits inherent semiconductor current balance, low commutation losses, unrestricted frequency output, high dynamic response and requires small AC filter compensation. Moreover, the converter offers 73% higher voltage than the traditional indirect frequency converter. Simulation based on a discrete state instantaneo... View full abstract»

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  • Telecommunication networks present and future

    Publication Year: 1990, Page(s):53 - 58
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The author focuses on the impact of optics on telecommunication networks worldwide. As optical fibres penetrate home and business, very high bandwidth applications become possible. Standards currently under development deal with broadband integrated services digital networks (B-ISDN). The proposed deployment of optically-based high-speed networks gives rise to a host of research issues that must b... View full abstract»

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  • Multidimensional ultrasonic imaging and tissue characterization

    Publication Year: 1990, Page(s):126 - 130
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Myocardial ischemia can be studied using multidimensional parametric or material property images of the heart obtained using ultrasound. The author describes methods suitable for both in vitro and in vivo evaluation of hearts from experimental animals and for in vivo human hearts. Regions of ischemia can be seen as early as 5 minutes after the blood flow has been terminated from regions of the myo... View full abstract»

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  • Practical aspects of managing modern technical projects

    Publication Year: 1990, Page(s):96 - 100
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Management has become as complex as the advanced systems being developed. It is recognized by government and industry that management ability and proper management tools and techniques contribute significantly to satisfactory project performance. The author addresses the practical aspects of managing modern technical projects with emphasis on those factors that experience has shown can cause the m... View full abstract»

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  • US aircraft landing systems-VHF-UHF and microwave

    Publication Year: 1990, Page(s):62 - 65
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The aircraft instrument landing system (ILS), operating in the VHF/UHF frequency bands has been in operation for over 50 years. With the various glide slope systems and the highly directional localizer antenna arrays successful ILS performance can now be achieved under the most adverse electromagnetic conditions. Several disadvantages prevent ILS from meeting the needs of aviation indefinitely. Th... View full abstract»

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  • Brazilian industrial power system

    Publication Year: 1990, Page(s):141 - 142
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    The author presents a description of the actual procedures and figures of the Brazilian industrial power system and steps taken in Brazil to increase its reliability. Brazilian industry consumes more than fifty percent of the power produced in Brazil. The use of CHP and predictive maintenance has helped to increase system reliability View full abstract»

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  • Expanding the Uruguayan public packet network: new architectures for the main switch

    Publication Year: 1990, Page(s):68 - 71
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The authors discuss the expansion of the main switch in the Uruguayan public packet network (URUPAC). The switch is an indigenous development based on several prior designs for the telex and data public networks. The advantages of a distributed architecture are presented. The choice of a communication bus was in the past a very difficult item. Several alternatives are discussed according to the ex... View full abstract»

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