By Topic

Proceedings of the 1990 IEEE Colloquium in South America

Aug. 31 1990-Sept. 15 1990

Filter Results

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
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Influence of modeling in load flow analysis of three phase distribution systems

    Publication Year: 1990, Page(s):173 - 176
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The authors present a comparison of three phase load flow algorithms for distribution power systems. Reference is made to traditional single-phase load flow methods used in transmission systems and the main three-phase load flow methods used in distribution. Studies of two Chilean distribution networks are made with an algorithm based on the power summation method, and a comparison of errors and t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Energy management systems (EMS): use in emergency conditions

    Publication Year: 1990, Page(s):168 - 172
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Power systems in emergency conditions are analized together with the control possibilities arising from the support of energy management systems. Main conditions include loss of generation in a power system and power deficit in industrial distribution systems. Use of EMS in data recording, processing and updating tables according to real-time conditions are then examined and interaction with load-... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • `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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.