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Colloquium in South America, 1990., Proceedings of the 1990 IEEE

Date Aug. 31 1990-Sept. 15 1990

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Displaying Results 1 - 25 of 37
  • Proceedings of the 1990 IEEE Colloquium in South America (Cat. No.90TH0344-2)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (97 KB)
    Freely Available from IEEE
  • 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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  • 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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  • Power electronics today

    Publication Year: 1990, Page(s):184 - 187
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    More electric power is being used today than ever before. Billions of kilo-watts of electric power are being re-processed every day in order to provide the kind of power needed by the sophisticated loads which our advanced technology is producing. Power electronics is the engineering discipline which converts electrical power from one form to another 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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  • 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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  • 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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  • Sensor based robot control systems

    Publication Year: 1990, Page(s):203 - 208
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Sensor based robot control systems can overcome many of the difficulties of uncertain models and unknown environments which limit the domain of application of current robots used without external sensory feedback. Among various sensors, vision is expected to play a very important role in control of intelligent robot. Recently there has been increasing interest in upgrading robot intelligence by us... 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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  • 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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  • 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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  • Control and planning of 50/60 Hz industrial system load flows

    Publication Year: 1990, Page(s):162 - 167
    Cited by:  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A 50/60 Hz load flow (LF) model for electric power system (EPS) linked by static frequency converters (SFC) is proposed. In this model the different operation modes of CEF are considered: by power-frequency control and by fixed active power control 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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  • 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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  • The role of process engineering in product and service realization

    Publication Year: 1990, Page(s):101 - 106
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The authors discuss an approach to quality improvement called `Process Engineering'. The notion of a process is crucial to its success; and in addition, a new type of engineering, based on disciplined team work, supported by systematic analysis to determine the degree and quality of the value to be added by each function or operation, forms the basis of the underlying methodology. The authors disc... 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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  • 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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  • Some technical aspects in the development of Chilean Central Interconnected System

    Publication Year: 1990, Page(s):143 - 144
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The author addresses some technical aspects experienced in the Chilean Central Interconnected System. A brief description of the degree of development is also given, together with a future vision of expansion possibilities View full abstract»

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  • Feedback control strategies for boost type PWM rectifiers

    Publication Year: 1990, Page(s):193 - 198
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Boost type PWM rectifiers need special feedback control loops to work properly. The author analyzes three different feedback control strategies which are studied. The three strategies discussed are: DC controlled rectifiers; indirect current controlled rectifiers; and indirect DC voltage controlled rectifiers. The stability boundaries, parameter sensitivity and complexity of each topology are anal... View full abstract»

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  • Current status of the artificial heart and cardiovascular assist devices

    Publication Year: 1990, Page(s):3 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Assist devices in existence today include extracorporeal blood pumps, intraaortic balloon pumps (IABP), external and implantable ventricular assist devices (VAD), autologous biological pumps, and the total artificial heart (TAH). The intraaortic balloon pump is in widespread clinical use and various extracorporeal pumps are available for temporary cardiac support during cardiac surgery. Ventricula... 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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  • 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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  • 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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  • Open architecture distributed processing-the modern design for electric power network automation

    Publication Year: 1990, Page(s):150 - 161
    Cited by:  Patents (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The authors explore a new design concept for electric power network automation-an open architecture distributed processor based supervisory control and data acquisition (SCADA) and SCADA/EMS (energy management system). Good quality, availability, and reliability of the electric power supply is important to people throughout the world. Therefore, the electric power network automation systems must b... 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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