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System Theory, 1994., Proceedings of the 26th Southeastern Symposium on

Date 20-22 March 1994

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Displaying Results 1 - 25 of 129
  • Proceedings of 26th Southeastern Symposium on System Theory

    Publication Year: 1994
    Request permission for commercial reuse | PDF file iconPDF (130 KB)
    Freely Available from IEEE
  • Switching adaptive filter structures for improved performance

    Publication Year: 1994, Page(s):442 - 446
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    By switching between adaptive filter algorithms/structures one can have an adaptive filter system that produces fast convergence and low mean square error (MSE). An adaptive filter algorithm/structure for which convergence is not affected by the eigenvalue ratio of the input is used to produce fast convergence, while an adaptive filter that yields low MSE, low computational load, and good numerica... View full abstract»

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  • Convergence of a recursive rational interpolation-based identification algorithm

    Publication Year: 1994, Page(s):518 - 522
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    This paper investigates the convergence properties of an identification algorithm based on recursive rational interpolation. The algorithm utilizes the moving discrete Fourier transform (MDFT), which is a recursive form of the DFT, to efficiently monitor certain points in the spectra of the system input and output signals. Convergence of parameter estimates to their true values is established for ... View full abstract»

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  • Global optimization of stochastic multivariable functions

    Publication Year: 1994, Page(s):323 - 326
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    This paper presents a new methodology for global optimization of a stochastic multivariable functions subject to stochastic, possibly nonlinear constraints. Least squares parametric estimation is applied as an intermediate step in the stochastic optimizer which then uses a special transformation to capture the global optima estimate. A comparative study of implementing estimation in polynomial lea... View full abstract»

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  • Algorithm and architecture for feature extraction in image recognition

    Publication Year: 1994, Page(s):448 - 452
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The authors present a method of measuring the degree of similarity of handwritten characters. This method is based on the segments of handwritten characters. Each handwritten image is decomposed into several segments. Then they compare the segments which belong to different handwritten images using their distance fields. The result is distance of two handwritten images. These distances can be used... View full abstract»

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  • A new discrete-time state model for linear dynamical systems with continuously-varying control/disturbance inputs

    Publication Year: 1994, Page(s):523 - 527
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A new form of discrete-time state model for linear dynamical systems is derived. Unlike conventional discrete-time models, this new model accommodates cases where the values of the system inputs (controls u(t) and/or disturbances w(t)) may vary continuously with time (in an uncertain manner) over each sample-interval kT⩽t<(k+1)T. This new discrete-time model has important applications in sy... View full abstract»

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  • A survey of incipient fault detection and location techniques for extruded shielded power cables

    Publication Year: 1994, Page(s):402 - 405
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The existing techniques for the detection and location of incipient faults (e.g. electrical trees) in extruded shielded power cables are reviewed. Only the techniques developed for field applications are included. The advantages and disadvantages of each technique are evaluated from the point of view of a power engineer. The desired features of an ideal incipient fault detection and location syste... View full abstract»

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  • Fast and slow control laws for a two-link non-linear manipulator

    Publication Year: 1994, Page(s):328 - 332
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The method of singular perturbations is utilized in reducing the order of the mathematical models representing the robot arm dynamics. The model reduction takes place by identifying the fast and slow dynamics of the original robot arm. Two separate control laws for the slow and the fast subsystems are identified. The slow subsystem control law is related to the desired position of the robot arm an... View full abstract»

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  • An efficient image coding implementation using the quadtree algorithm

    Publication Year: 1994, Page(s):453 - 456
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The authors present a novel approach to image processing that uses a straightforward quadtree algorithm. They store in computer memory the regional address and pertinent information attributes. They then can recall and restore the image to its original state. Advantages to using this approach include reduction in memory required to store the entire image and a simplification of the overall image s... View full abstract»

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  • A practical approach for determining burst error distributions for convolutional codes

    Publication Year: 1994, Page(s):572 - 575
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    In evaluating the performance of concatenated error-correction codes, it is useful to know the error statistics at the inner code output. A common inner code is a convolutional code. Methods for characterizing the output error statistics for convolutional codes do exist, but the computational effort required grows exponentially with the constraint length. This paper presents a computationally feas... View full abstract»

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  • Design of an active vibration control system for isolation of an optical bench

    Publication Year: 1994, Page(s):43 - 46
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The isolation of an optical bench mounted on an airplane using active noise cancellation was studied. The most difficult problem is the necessity for isolation at low frequencies (0.1 Hz). At these frequencies, an active noise cancellation filter was necessary. An ANC filter using strain gauges (which have no rigid body component) as the reference signal was simulated with several different algori... View full abstract»

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  • PowerPC processors

    Publication Year: 1994, Page(s):550 - 556
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    In October of 1991, IBM, Apple, and Motorola formed an alliance to produce a new microprocessor family named the PowerPC. Less than two years later, the alliance has produced the first chip of the PowerPC family, the MPC601. The paper analyzes the PowerPC 6xx family, with an emphasis on the architecture of the MPC6O1 chip. The 601's Reduced Instruction Set Computer (RISC) architecture is examined,... View full abstract»

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  • A microprocessor controlled portable communication system for the impaired

    Publication Year: 1994, Page(s):530 - 534
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    This paper presents the design and implementation of a microprocessor controlled portable digital communication system with speech synthesis for the hearing, mute, and seeing impaired. The system is integrated with a time division multiple access using short bursts and consists of a keyboard with braille, speakers, and liquid crystal display suitable for digital signal processing and VLSI implemen... View full abstract»

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  • Using EASY5 to investigate filtering of power system area control error

    Publication Year: 1994, Page(s):406 - 410
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The area control error (ACE) is an indication of the mismatch between generation and load demand of a power system. This signal is an integral part of the automatic generation control (AGC) system which seeks to match area generation and load on a moment to moment basis. High frequency load variations and noise in the ACE signal can cause unnecessary and unwanted control action to occur. This pape... View full abstract»

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  • Applications of vibration reduction of flexible space structure using command shaping technique

    Publication Year: 1994, Page(s):333 - 336
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    This paper presents applications of command shaping techniques to space docking and slewing maneuvers of space vehicles with flexible appendages to eliminate mechanical vibration with large amplitude. The command shaping approach has been evaluated on slowly varying computer model of the Space Shuttle Remote Manipulator system. For application of the technique to docking operation the elementary r... View full abstract»

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  • Image data compression using multiple bases representation

    Publication Year: 1994, Page(s):457 - 461
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Digitized images contain huge amounts of information which strain, or exceed, the capacity for their real-time processing, storage, and retrieval. Various compression techniques have been developed to reduce the amount of data necessary for representation. The authors report on a hybrid image data compression procedure based on a multiple bases representation. The multiple bases representation tec... View full abstract»

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  • Fuzzy logic based suspension system

    Publication Year: 1994, Page(s):172 - 176
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The purpose of a vehicle suspension system is to balance the tradeoff between ride quality and handling performance. This is achieved by controlling the relative position and motion between the vehicle body and wheels in order to reduce the effects of variations in the road profile. Good handling requires a stiff suspension to maintain tire contact with the road. On the other hand, good ride requi... View full abstract»

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  • An optimal volume ellipsoid algorithm for parameter set estimation of time varying systems

    Publication Year: 1994, Page(s):110 - 114
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    In this paper, we investigate how parameter set estimation (PSE) can be applied to time varying systems. Parameter set estimation identifies a set of estimates which are feasible with the measured data and a priori information. For application to adaptive robust control and adaptive signal processing, it is important the size of this set be as small as possible. We will investigate how an optimum ... View full abstract»

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  • Multi-scale wavelet modulation

    Publication Year: 1994, Page(s):576 - 580
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The purpose of this paper is to provide the fundamental characterization of a general multidimensional modulation format which utilizes wavelet basis functions as pulse shapes. This type of modulation is particularly effective in distorting channels since it allows for frequency selective processing. In addition to developing the signal format, power spectral density, bandwidth efficiency and erro... View full abstract»

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  • Error analysis of filters implemented with floating point arithmetic

    Publication Year: 1994, Page(s):47 - 51
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Discrete time filters widely used in most control applications are usually implemented on finite precision digital devices which employ either fixed point of floating point arithmetic. Large dynamic range and the inherent normalizing characteristic of floating point representations may, in certain cases, make them preferable over other forms of representations. In a general simulation of system re... View full abstract»

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  • Coherent source location using autocorrelation matrix smoothing with transmit/receive arrays

    Publication Year: 1994, Page(s):427 - 431
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    When arrays of narrowband transmitting and receiving elements are used to locate the directions of remote targets, the reflections from the targets are often spatially coherent. Angle of arrival (AOA) estimation techniques such as MUSIC are not effective in this situation. A spatial smoothing operation can be performed on the sum coarray of the transmit/receive system in order to decorrelate the c... View full abstract»

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  • Real-time histogram generation using optical scanning

    Publication Year: 1994, Page(s):310 - 314
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A prototype of an optical-electronic histogram generator has been designed and tested for 1-D objects. In this scheme, the object to be analyzed is laser scanned. The resulting optical signal is detected by a photodetector which generates an electrical signal output which is subsequently analyzed with a combination of analog and digital electronics. The system has shown to be fairly modular in des... View full abstract»

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  • Preliminary developments with the Linda programming environment for signal processing and control applications

    Publication Year: 1994, Page(s):557 - 561
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The paper provides an overview of the Linda parallel programming paradigm and toolset and preliminary developments in adapting them for signal processing and control applications. Topics discussed include an overview of the Linda tuple-space paradigm, a brief overview of the Linda programming techniques, a summary of on-going developments in adapting these tools for signal processing and control a... View full abstract»

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  • A dedicated microprocessor for urinary incontinence stimulator

    Publication Year: 1994, Page(s):535 - 539
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A programmable memory-content readable urinary incontinence stimulator with very low power dissipation is presented in the paper. To keep the stimulated nerve from getting used to a fixed pattern of stimulation, the spaces in the stimulating pulse stream are randomly modulated. An important feature of this stimulator is its very low power dissipation, about 20 μA in normal operation. This assur... View full abstract»

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  • Methods for determining linear synchronous machine parameters

    Publication Year: 1994, Page(s):411 - 415
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A survey of methods for determining synchronous machine equivalent electrical circuit parameters is presented. These equivalent circuits are the basis for computer analysis and simulation. Circuit parameters developed for rotary synchronous machine (RSM) modeling are in wide use. Similar linear synchronous machine (LSM) parameters are not as well developed. This paper suggests methods for obtainin... View full abstract»

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