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System Theory, 1990., Twenty-Second Southeastern Symposium on

Date 11-13 March 1990

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Displaying Results 1 - 25 of 128
  • Multiple point source location via infrared array processing methods

    Publication Year: 1990, Page(s):230 - 234
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (309 KB)

    The detection and location of multiple targets in a noisy environment are considered. High-resolution direction-finding techniques have proved to be effective in radar and sonar multiple-target-location applications. In these problem domains, the data being modeled can be represented as a linear combination of fundamental signals whose behavior is parametrically dependent on the location parameter... View full abstract»

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  • Twenty-Second Southeastern Symposium on System Theory (Cat. No.90TH0301-2)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (552 KB)
    Freely Available from IEEE
  • On the generalized nearest neighbor filter

    Publication Year: 1990, Page(s):261 - 264
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    The authors present a new tracking algorithm for targets in a cluttered environment. The basic idea is to use all the data that fall into a validation gate. A weighted sum of these data is processed by means of a modified Kalman filter. A weighting coefficient is the distance between a given radar return and the predicted target position. The derived filter has a better performance than the neares... View full abstract»

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  • Parallel state estimation in power systems

    Publication Year: 1990, Page(s):255 - 260
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The authors present an extensive review of the work to date on the subject of parallel state estimation. Modifications to an existing multilevel state estimator for power systems, based on the method of least squares, are proposed. These modifications are expected to improve the quality of the overall estimated system state View full abstract»

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  • Decentralized estimators for interconnected systems using the interface information

    Publication Year: 1990, Page(s):250 - 254
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    A method for designing decentralized linear state estimators for large-scale systems is proposed. The system under consideration, called the global system, consists of a set of interconnected subsystems called local models. The coupling among the subsystems is described by an algebraic equation. The information about the system consists of noisy measurements taken at the subsystem level, called lo... View full abstract»

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  • Bearing estimation using Hopfield neural network

    Publication Year: 1990, Page(s):440 - 443
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    A neural network algorithm for bearing estimation is introduced. It utilizes a basic and proven property of Hopfield neural networks, i.e. the guaranteed convergence to a local minimum of the Lyapunov energy function. Unlike the previous methods, the new method estimates the in-phase and quadratic components separately and in a parallel manner and combines them to estimate the bearings of plane wa... View full abstract»

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  • An algorithm for a fast two-dimensional discrete cosine transform

    Publication Year: 1990, Page(s):646 - 651
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The authors present an algorithm for the implementation of the two-dimensional discrete cosine transform (DCT) for 2n×2n data points. This algorithm is based on a recently published fast one-dimensional DCT algorithm. The new algorithm is recursive, fast, and numerically stable. The two-dimensional decomposition in this new algorithm is based on the vector-radix approac... View full abstract»

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  • Feature extraction using an optical scanning system

    Publication Year: 1990, Page(s):244 - 248
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Real-time image processing has been achieved by using an optical scanning system in conjunction with electronic hardware. A report of experimental results on edge extraction and image thresholding for transmissive objects is presented. Advantages and limitations of the techniques are identified. The results indicate that real-time edge extraction and image thresholding can be satisfactorily achiev... View full abstract»

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  • Scattering of horizontally polarized electromagnetic fields by random surfaces

    Publication Year: 1990, Page(s):157 - 160
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Field scattering by a rough surface has been of interest because of its applications in radar and communications. One method of expressing the surface shape is statistical. In this work the rough surfaces consist of piecewise-linear segments or facets having random slopes and variable horizontal projections. Such surfaces are described by the Markov chain, and the surface heights correspond to the... View full abstract»

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  • An overview of RISC vs. CISC

    Publication Year: 1990, Page(s):436 - 438
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    One of the most significant recent developments in computer processor technology is the RISC (reduction-instruction-set-computer) microprocessor. Under certain circumstances, RISC devices offer significant advantages over their conventional CISC (complex-instruction-set-computer) counterparts. A brief comparison of the principal features of both RISC and CISC processors is presented View full abstract»

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  • Performance optimization in signal processing systems

    Publication Year: 1990, Page(s):641 - 645
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    Techniques for optimizing the utilization of underlying computer resources with respect to a dynamic signal-processing system executing on them are discussed. An example system is used to illustrate these techniques: a structurally adaptive solution to the sonar problem, the direction-of-arrival finding problem, was implemented under the Multigraph architecture. The signal processing system runs i... View full abstract»

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  • Optical flow from a single image

    Publication Year: 1990, Page(s):239 - 243
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    An NTSC RS-170 standard image of a dynamic scene usually exhibits a 60-Hz flicker when displayed on a CRT. This is because the two interlaced fields of the image are captured 1/60 of a second apart, and the scene has changed slightly in that interval. It is shown how a shift between the two fields of a time-varying image can be accurately measured and corrected using optical flow techniques of ima... View full abstract»

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  • Electric field simulation in a non-uniform field dielectric system

    Publication Year: 1990, Page(s):152 - 156
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The charge simulation method (CSM) is used to compute potential and electric field distribution in a `hyperboloid-plane' electrode system. Electric field enhancement along the axis of the hyperboloid and within the dielectric is calculated at various interelectrode spacings and with various tip radii. Results are consistent with geometrical configurations and within ±1% accuracy View full abstract»

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  • Forced systems with multiple steady states

    Publication Year: 1990, Page(s):405 - 409
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The design and analysis of electronic systems often require determination of the steady state response of nonlinear circuits. The purpose of the paper is to reexamine some of the well known facts about nonlinear systems and their analysis. For nonlinear systems there may be two or more different steady-state responses, as in the case of jump resonance; there can be responses of different periods, ... View full abstract»

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  • The concept of hyperspace in dynamical system theory

    Publication Year: 1990, Page(s):462 - 466
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A new generalization of the state-space concept called hyperstate space, or simply hyperspace, is presented. The concept of hyperspace enables the quick determination of certain important geometric and analytic features of system-dynamic behavior without explicitly solution of the system state equations. The usefulness of the hyperspace concept is demonstrated by several examples from different ar... View full abstract»

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  • Strategies for functional testing of microprocessors

    Publication Year: 1990, Page(s):431 - 435
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Effective strategies for generating tests for microprocessors are presented. Modular block, comprehensive instruction set, and microinstruction set approaches are proposed. These practical approaches are viable alternatives to the exhaustive testing which aims at considering all possible instructions, addressing modes and data patterns. The proposed approaches are versatile and effective, especial... View full abstract»

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  • Input/output distribution in digital control

    Publication Year: 1990, Page(s):482 - 486
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The temporal distribution of input and output is the main feature of distributed sampling control (DSC). The DSC method was first used to improve the performance of multi-input-multioutput (MIMO) robotic control systems. Control algorithms to which this method can be applied require each system output (or state variable) at a different time point and generate each plant input at a different time p... View full abstract»

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  • Digital-parallel residue-binary conversion

    Publication Year: 1990, Page(s):636 - 640
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A method for residue-number-system- (RNS-) to-weighted-binary-number system (-BNS) conversion for moduli of the form 2k-1, 2k, 2k+1 is presented. The conversion method, which is called the Srinivasan-Gallaher (SG) method, is an application of work by P. Srinivasan et al. on division by 2n -1 and 2n+1. Specifically, the method for computing remainder... View full abstract»

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  • A new autoregressive estimator for the estimation of the frequencies of a sinusoidal process corrupted with noise

    Publication Year: 1990, Page(s):540 - 544
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The authors propose an autocorrelation-based method for determining the autoregressive parameters of a signal containing sinusoids. This method does not use the zero-lag autocorrelation value of the signal and is thus immune to the error caused by an additive white noise present in the signal. The autoregressive parameters are then used to determine the frequencies of the sinusoids. The method req... View full abstract»

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  • Two-dimensional Benes network

    Publication Year: 1990, Page(s):614 - 619
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The Benes network is extended in two dimensions. The control algorithm for the 2-D network is described, and the complexities of the 1-D and 2-D architectures are compared. It is shown that the 2-D Benes network has some advantages over the 1-D Benes network. The number of stages in the 2-D network is smaller than the corresponding number in the 1-D network. Also, the 2-D network requires fewer sw... View full abstract»

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  • Parallel image processing on a transputer-based system

    Publication Year: 1990, Page(s):235 - 238
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The problem addressed is how to use transputer networks for image processing. As is well known, SIMD (single instruction/multiple data) or MIMD (multiple instruction/multiple data) architectures are very useful in parallel computing. The authors describe how to use transputers as a SIMD or MIMD machine to implement parallel image processing. Several image-processing algorithms, including Laplacian... View full abstract»

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  • Modeling and identification of human musculoskeletal walking system

    Publication Year: 1990, Page(s):146 - 150
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Several methods are tested to identify the human musculoskeletal system both as a linear and nonlinear system. For the linear system approach, a MIMO (multiinput, multioutput) ARX (autoregressive with exogeneous inputs) model is first tested to get a rough estimation of the system structure and parameters. A general linear input-output MIMO model is then developed, and parameters are estimated by ... View full abstract»

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  • TOPS-a distributed operating system kernel for transputer systems

    Publication Year: 1990, Page(s):103 - 107
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The authors describe a programming environment (TOPS) that creates an abstraction level such that a network of transputers is regarded as a virtual machine independent of the network topology. TOPS provides an extended process model and higher level of message passing than is provided by a bare transputer. The development of TOPS arose in the context of various projects requiring a higher level of... View full abstract»

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  • A generalized singular value approach to the localization of closed loop eigenvalues for multivariable discrete-time systems

    Publication Year: 1990, Page(s):401 - 404
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    A method for eigenvalue localization for discrete-time systems which does not require explicit placement of the closed-loop eigenvalues is presented. The method is based on a simultaneous diagonalization accomplished by means of the generalized singular value decomposition (GSVD). The GSVD is introduced and applied to the system matrix and modified control distribution matrix to show that a proper... View full abstract»

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  • Thresholding, Hamming distance, unipolar/bipolar binaries, and retrieval in neural network based memories

    Publication Year: 1990, Page(s):455 - 459
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The use of a bipolar retrieval key has the effect of doubling the length of the probe vector and making the number of +1's equal to the number of -1's in the stored vectors, even if the original stored vectors have an unequal number of +1's and -1's. The threshold conditions suggested by Hopfield and many others are examined, and certain proposed modifications to these functions are shown to be co... View full abstract»

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