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System Theory, 1991. Proceedings., Twenty-Third Southeastern Symposium on

Date 10-12 March 1991

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Displaying Results 1 - 25 of 121
  • Proceedings. The Twenty-Third Southeastern Symposium on System Theory

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (452 KB)
    Freely Available from IEEE
  • Representation of a curved boundary

    Publication Year: 1991, Page(s):84 - 88
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (335 KB)

    A method of representing a boundary curve is presented. The proposed method first partitions a boundary into segments by curvature zero-crossings. Inflection points on the boundary are extracted as curvature zero-crossings using the convexity/concavity of points with respect to their neighbor points. Each segment is then approximated by a parametric cubic polynomial, and the boundary curve is repr... View full abstract»

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  • Modified induction motor drive speed control strategies for loss reduction and efficiency enhancement

    Publication Year: 1991, Page(s):39 - 44
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Induction motor speed control strategies for loss reduction and efficiency enhancement are presented. Induction motor equivalent circuit models for efficiency enhancements were utilized to study the steady-state analysis of speed control of three-phase induction motors. The harmonic effects of nonsinusoidal supply voltages and the nonlinear variation of the magnetizing reactance as a function of m... View full abstract»

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  • Modelling, simulation and analysis of variable speed constant frequency wind energy conversion scheme using self excited induction generator

    Publication Year: 1991, Page(s):33 - 38
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    Presents the dynamic modelling of variable speed constant frequency [VSCF] wind energy conversion scheme [WECS], employing self excited induction generator, connected to the utility grid through an AC-DC-AC converter scheme with uncontrolled rectifier and PWM inverter. The proposed scheme for regulating the flow of power through the link ensures reduced reactive power burden on the self excitation... View full abstract»

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  • Interfacing synchronous machines with power systems for fault analysis: constructing symmetrical components from machine dqO quantities

    Publication Year: 1991, Page(s):28 - 32
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Presents a procedure for obtaining time-domain solutions for faulted power systems containing multiple rotating machines. The time-domain solutions are obtained using a combination of both time and steady-state frequency-domain techniques. The transmission network is modeled using steady-state AC techniques, while the rotating machines are represented by sets of coupled differential equations. The... View full abstract»

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  • CAD tool integration for ASIC design: an end-users perspective

    Publication Year: 1991, Page(s):363 - 368
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The increasing complexity of VLSI design and the demand for quick-turnaround ASICs has forced the designer to choose the best CAD tools available from different vendors and integrate them into a customized and comprehensive CAD system. Vendors have developed comprehensive but open systems, called CAD frameworks, to ease the process of CAD tool integration. This paper describes the ASIC development... View full abstract»

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  • Transient analysis of power systems using a frequency domain technique

    Publication Year: 1991, Page(s):22 - 27
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Presents a review of a frequency domain technique for power system transient analysis. Frequency domain analysis represents the power system voltage and current equations as a function of the complex frequency. The system of equations is then solved using a numerical inverse Laplace transform technique, which yields the system voltages and currents. The technique is compared with a time domain met... View full abstract»

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  • Global routing in sea-of-gates technology

    Publication Year: 1991, Page(s):359 - 362
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    With the advance of VLSI technology, wires are now routed not only in the channels but also over the cells. The author studies the global routing of multiterminal nets in the sea-of-gates technology. For an m×m array he presents a global router that produces the optimal channel width in the x-direction and guarantees that the channel width in the y-directi... View full abstract»

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  • Implementation consideration of code division multiple access sequences

    Publication Year: 1991, Page(s):11 - 15
    Cited by:  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The linear span of a sequence is defined as the minimum number of stages of a linear feedback shift register required to generate the given sequence. Thus, the linear span is a measure of the complexity of the sequence structure. A large complexity or linear span is desired for security of the sequence. The binary No sequence requires nonlinear connections in addition to the linear feedback shift ... View full abstract»

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  • Algorithms for graphics texture mapping

    Publication Year: 1991, Page(s):613 - 617
    Cited by:  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    New and efficient algorithms for texture mapping computer graphics images have been developed. A number of different texture mapping methods have been implemented and results compared and analyzed. The basis of this study was to develop real time algorithms useful in designing graphics processor architectures using parallelism and high performance low cost elements such as the i860 microprocessor.... View full abstract»

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  • Detection and statistics of amplitude and wave front fluctuations

    Publication Year: 1991, Page(s):287 - 291
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The statistical characteristics of the amplitude and phase of an optical wave propagated through a transparent randomly varying method are examined analytically. An optical-digital method has been proposed far the detection of amplitude and phase of the randomly distorted wave. This method reveals that only a single output of the detected signal is needed to obtain both the phase and amplitude var... View full abstract»

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  • Design of a fault-tolerant RISC microprocessor using VHDL

    Publication Year: 1991, Page(s):354 - 358
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Describes a single fault-tolerant microprocessor whose development has been influenced by the more popular multiprocessor architecture. The characteristics of this microprocessor fall within the basic constraints of the RISC architecture, therefore it is considered to be a fault-tolerant RISC microprocessor. This fault-tolerant microprocessor is modeled using VHDL, the very high speed integrated c... View full abstract»

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  • 16-kbps modem design using vector quantization

    Publication Year: 1991, Page(s):7 - 10
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    As compared to traditional modem schemes, vector quantisation (VQ) offers higher transmission rates for a fixed SNR or lower SNR's for a fixed transmission rate. The initial simulation efforts, written in F77, used the AWGN channel with low dimensions (1-8) and data rates of 1-3 bits/sample or equivalently 8000-24000 bits/second. The research strategy involves the following: (1) upgrading the VQ m... View full abstract»

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  • ER modeling of semantic structure for survey design

    Publication Year: 1991, Page(s):609 - 612
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A vital portion of conceptual analysis is the identification and definition of the semantic structure of a domain. The paper discusses semantic structure, contrasting it with semantic content, and describes the role of both in formal descriptions of domain concepts. The entity-relationship (ER) model offers the scope and expressive capacity appropriate for representing semantic structure (but is i... View full abstract»

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  • A parametrically drive PLL lock detector

    Publication Year: 1991, Page(s):283 - 286
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A parametrically driven PLL lock detector is presented. The lock detector is described by a time-varying linear differential equation derived from the PPL's nonlinear dynamics. The time-varying nature of this detector equation results from the fact that it is parametrically driven by the output of the PLL's quadrature detector. A lock decision is made by comparing a detector equation state to a us... View full abstract»

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  • Constant speed prediction for maneuvering targets using a three dimensional turning rate

    Publication Year: 1991, Page(s):239 - 243
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Existing algorithms for constant speed prediction restrict the prediction to the horizontal or vertical planes or require the prediction to be computed in a target oriented reference frame. A prediction algorithm that utilizes the output of a linear state estimator to accomplish constant speed prediction is presented. This prediction algorithm uses a 3D turning rate during the prediction process t... View full abstract»

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  • A linearization technique for linearly inseparable patterns

    Publication Year: 1991, Page(s):207 - 211
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    This paper concerns a technique which transforms a set of linearly inseparable binary patterns to a set of linearly separable one. Using the technique, a framework to train multilayer perceptrons without iteration is introduced. The trained multilayer perceptrons using these ideas use only hard limiters as neutrons and integer weights and thresholds. Hence accurate hardware implementation of the n... View full abstract»

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  • An implementation of backpropagation algorithm on a massively parallel processor

    Publication Year: 1991, Page(s):347 - 352
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The backpropagation learning algorithm has been modified to operate in a massively parallel environment. The network has 1024 neurons in the first layer; there are two hidden layers, either of which can be activated on demand. The first hidden layer has 256 neurons and the second hidden layer has only 64 neurons. The output layer has only ten different classes. The network operates in concurrent a... View full abstract»

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  • Transverse wave propagation in media characterized by an exponential impedance profile

    Publication Year: 1991, Page(s):419 - 423
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A closed form analytical solution for the reflection coefficient of a plane wave propagating in isotropic, nonhomogeneous media having an exponential impedance profile and a constant velocity profile is presented. Power transmission curves will be displayed for various cases including the exact quarterwave case View full abstract»

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  • A fast acquisition technique for direct sequence spread spectrum communication systems

    Publication Year: 1991, Page(s):2 - 6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    With the proliferation of direct spread spectrum systems (DSSS) in the communications arena, synchronization techniques that offer improved performance and higher speed are of great value. Matched filter approaches have gained momentum in recent years, while sliding correlators have experienced slower development. This paper deals with a modification to the sliding correlator implementation. A uni... View full abstract»

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  • Effects of contrast and brightness on subpixel image correlation

    Publication Year: 1991, Page(s):604 - 608
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    In the past years a method that uses digital image correlation to determine the deformations of subsets of an object has been developed. In the paper an attempt is made to explore and understand the effects of changing signal amplitude on the errors associated with digital image correlation. This is important because changes in signal amplitude relate to changes in contrast and brightness between ... View full abstract»

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  • A review of fetal ECG detection and enhancement methodologies

    Publication Year: 1991, Page(s):278 - 282
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    This paper presents a review of fetal electrocardiogram (FECG) detection and enhancement methodologies developed since 1960. The methods discussed include the subtraction, correlation, orthogonal basis, adaptive filtering and linear combination techniques. Subtraction is the oldest and most straightforward approach. It involves the direct subtraction of a near-thoracic maternal ECG from an abdomin... View full abstract»

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  • A simulation application in facility expansion decision-making

    Publication Year: 1991, Page(s):65 - 67
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    A manufacturing company wanted to expand its capacity to produce plastic parts. The expansion could cost several million dollars. To decide how many plastic molding presses should be purchased, a computer simulation study was conducted. The object of the study was to find the quantity and type of equipment needed to satisfy production requirements in a just-in-time environment. The model of the pl... View full abstract»

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  • Tracking constant speed targets using a kinematic constraint

    Publication Year: 1991, Page(s):233 - 238
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The tracking of constant speed, maneuvering targets is addressed through the use of a kinematic constraint. The trajectory of any constant speed target must satisfy the kinematic constraint A·V=0, where A and V are the target acceleration and velocity, respectively. The kinematic constraint is included in the filtering process is a pseudomeasurement. The ... View full abstract»

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  • A neural network based histogramic procedure for fast image segmentation

    Publication Year: 1991, Page(s):203 - 206
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The determination of the dimension of a lumber board, the location and extent of surface defects on it, are essential in the construction of a visual inspection station for the lumber industry. The paper presents a neural network based histogramic procedure that performs on the image of a board and can be used to determine the board dimension, the location and extent of surface defects on it, in n... View full abstract»

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