By Topic

1993 (25th) Southeastern Symposium on System Theory

7-9 March 1993

Filter Results

Displaying Results 1 - 25 of 122
  • Author index

    Publication Year: 1993
    Request permission for commercial reuse | PDF file iconPDF (186 KB)
    Freely Available from IEEE
  • 1993 (25th) Southeastern Symposium on System Theory

    Publication Year: 1993
    Request permission for commercial reuse | PDF file iconPDF (548 KB)
    Freely Available from IEEE
  • Stabilization of nonlinear quadratic systems

    Publication Year: 1993, Page(s):314 - 317
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The authors consider the nonlinear quadratic control system Mdw/dt=Aw+f(w)+g(w, u), where M and A are 3×3 matrices and, for a fixed m-vector u, f(w) and g(w,u) are quadratic in the 3-vector w=(x, y, z)'. Several theorems and examples that explore the relationship between the quadratic function and the matrices that are involved are presented View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the solution of nonlinear, second order, autonomous systems

    Publication Year: 1993, Page(s):310 - 313
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The author's previous work on an extension of Abel's identity to nonlinear second order systems is applied to the construction of implicit general solutions to two complicated nonlinear systems. Both systems are nonconservative. One has a quadratic nonlinearity in the response terms and the other has a cubic nonlinearity. The exact general solutions are shown to involve a definite integral with re... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Model reference adaptive control system hyperstability analysis

    Publication Year: 1993, Page(s):307 - 309
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The stability of the model reference adaptive control system with external disturbance and unmodeling is discussed. Instead of Lyapunov's method, more general results have been acquired for the analysis of hyperstability. It is shown that if only the linear forward block can be made strictly positive real, then the globally asymptotical hyperstability of the error model structure will be guarantee... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Observability requirements for passive target tracking

    Publication Year: 1993, Page(s):253 - 257
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Observability requirements for passive target tracking in a three-dimensional coordinate system are derived. The observability problem is formulated as an optimization problem. Certain practical situations, previously known, can be identified from the established observability requirements. However, direct application of these theoretical results does not seem to be trivial for a practical situati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Root-loci for periodic linear systems

    Publication Year: 1993, Page(s):587 - 593
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    According to the Floquet theory, an nth-order linear periodic (LP) system of the form ynn (t) yn-1+...+α2(t)dy( t)/dt1(t)y=0 can be transformed into an equivalent linear time-invariant (LTI) system whose characteristic roots, known a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of a programmable rainfall simulator

    Publication Year: 1993, Page(s):215 - 217
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A programmable controller (PIC) was designed to provide a greater flexibility in rainfall simulator research. The PIC controlled the rainfall simulator using a process control board employing a microprocessor. This control board provided programmable capability previously unavailable in field research. Software to control the system was developed using assembly language and a microprocessor emulat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimal observation schedule for identification of nonlinear distributed systems with applications

    Publication Year: 1993, Page(s):301 - 305
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A system of quasi-variational inequalities (QVIs) of a novel type is obtained for the problem of optimizing the observation schedule for the problem of parameter identification for nonlinear parabolic and hyperbolic systems with pointwise observations. Results on the existence, uniqueness, and iterative approximation of solutions of the resulting QVI systems are presented. These solutions lead to ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Robust control design of an autolanding system

    Publication Year: 1993, Page(s):248 - 252
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A linear-quadratic-Gaussian/loop-transfer-recovery (LQG/LTR) design for an automatic landing controller for a typical commercial aircraft encountering a severe wind shear is presented. The airplane model is described, and the control objectives are outlined. Simulation results are presented, and the performance of the controller in handling the wind shear is evaluated View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A modified on-off model for conversational speech with short silence gaps

    Publication Year: 1993, Page(s):581 - 585
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Modifications to P.T. Brady's (1969) six-state model for the on-off patterns in conversational speech are proposed in order to incorporate short speaking pauses while preserving the characteristics of longer silent gaps (long speaking pauses and listening pauses) and also preserving the dynamics of the interaction between speaking parties. The modifications are based on data concerning the charact... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A simulation model for the analysis of a cluster-based multiprocessor system

    Publication Year: 1993, Page(s):457 - 461
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A cluster-based multiprocessor system that was introduced and analyzed by D. Agrawal and I. Mahgoub (1985, 1987) is considered. The analysis was based on an approximate analytical model, and the results were compared with those obtained for the crossbar and multiple-bus systems using the same model. A simulation model that relaxes two unrealistic assumptions of the approximate analytical model use... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • SPICE-A system analysis program?

    Publication Year: 1993, Page(s):195 - 199
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The use of SPICE behavioral models for system analysis is studied. The basic structure of behavioral models is discussed. Examples of the simulation of a system differential equation using an analog computer-type approach and the simulation of a feedback control system are given. The analysis technique is based on a block diagram description of system elements using subcircuits that lead to a very... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An analytic study of porosity evolution in powder metallurgy forming process

    Publication Year: 1993, Page(s):210 - 214
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The behavior of a porous metal in a closed-die compression test is studied with the aid of a Gurson-type model, and the results are compared with the results obtained from its quadratic approximation and the yield functions of S. Shima and M. Oyane (1976) and S.M. Doraivelu et al. (1984). Once the initial porosity and the effective stress-strain relation for the matrix is provided, the response of... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A radial basis network for seismic signal discrimination

    Publication Year: 1993, Page(s):348 - 351
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    An application of the radial basis function network to seismic waveform classification is presented. The network performs generalization and discrimination of input patterns using an external teacher. Modifications to this scheme are described. They include: (1) changing the size of the spheres; (2) using a random walk scheme during testing; (3) gradually decreasing the initial radii to avoid over... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A study of Kalman filtering and maximum likelihood estimates of wind profiles using simulated laser distortion data

    Publication Year: 1993, Page(s):296 - 300
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Wind profiles in turbulent atmosphere are estimated, using laser distortion data. A stochastic approach is introduced to develop a discretized model that describes the random behavior of the refractive index fluctuations, the random fluctuation of the atmosphere, and the uncertainty of the observations for a linear state system. A computer code has been developed to estimate the wind profile along... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Inventory control neural network system

    Publication Year: 1993, Page(s):243 - 246
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A two-layer perceptron feedforward backpropagation network architecture with a minimum number of hidden neurons is designed using the backpropagation training algorithm for a noncomplex application, namely, controlling a plant inventory system. The design objective is to determine the number of hidden neurons and what type of data must be entered to get the backpropagation algorithm started. The c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Stability and the transient energy method for the classroom

    Publication Year: 1993, Page(s):79 - 85
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The theory of transient energy and stability is reviewed. Basic concepts including the swing equation, stable and unstable equilibrium points, and the equal area criterion are discussed. A transient energy method and phase plane portraits are investigated. A simple interactive computer program based upon this transient energy method is described View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design and simulation of a modified duobinary acquisition system

    Publication Year: 1993, Page(s):576 - 580
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The implementation of a fast timing recovery system for the modified duobinary pulse amplitude (PAM) system is described, the implementation was verified by simulation, and the hang-up effects were examined. Simulation results for key components of the system and some key system parameters, such as the deviation constant and the loop gains, are in good agreement with previously published results View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Applications of GA-based optimization of neural network connection topology

    Publication Year: 1993, Page(s):333 - 337
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A genetic algorithm (GA) is used to explore the connection space of an artificial neural network (ANN) with the objective of finding a sparsely connected network that yields the same accuracy as a fully connected network. Such sparsity is desired as it improves the generalization capabilities of the mapping. The ANN with the GA-chosen set of connections is then trained using a supervised mode of l... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Stream-interleaved pipelined RISC processor design for SIMD and MIMD system development

    Publication Year: 1993, Page(s):452 - 456
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    Architectures exploiting time and space parallelism can be used to increase performance. Reduced instruction set computers (RISC) enhance performance of a single instruction stream through a simple load/store architecture. Data dependencies are eliminated by introducing NOP instructions in the stream. A longer pipeline increases the proportion of NOPs. These gaps may be used to interleave multiple... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Surface reconstruction of concealed objects

    Publication Year: 1993, Page(s):529 - 532
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A methodology for surface reconstruction that uses distance as the metric in determining an appropriate solution is presented. This metric is used because the primary application of the method is for reconstructing objects inside luggage, which requires a fast solution. Corner points from one contour are mapped to the other contour. The results do not produce a Eulerian path. Additional span lengt... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The residue identification algorithm and constrained least squares applied to space shuttle main engine data

    Publication Year: 1993, Page(s):279 - 284
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The residue identification algorithm (RID) is applied to flight data taken from the space shuttle main engine (SSME). Given spectral estimates of the SSME test data and the poles of the system, RID calculates a model of the spectral quantities using a least-squares technique. Application of RID to an SSME spectral estimate is shown. RID is also modified to use constrained least squares (CLS) inste... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improved dynamic programming algorithms for sequential decision processes with applications to economic dispatches of power systems

    Publication Year: 1993, Page(s):135 - 139
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A typical model for problems involving sequential decision processes in a discrete-time setting is considered. Several means to improve the regular dynamic programming method for solving the model problem are proposed. Reducing the sizes of the state and control domains is the key objective for improving efficiency. Theoretical justification of the domain reduction idea is provided View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Lightning impulse strengths of multiple dielectrics used on power distribution system

    Publication Year: 1993, Page(s):111 - 114
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The insulation strengths of the materials used in modern-day systems are discussed and compared. The aim is to provide help in determining impulse insulation strengths of multiple dielectrics. The test results are analyzed, and some procedures of utilizing fiberglass reinforced plastics (FRP) and other insulators in series are suggested View full abstract»

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