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System Theory, 1993. Proceedings SSST '93., Twenty-Fifth Southeastern Symposium on

Date 7-9 March 1993

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Displaying Results 1 - 25 of 122
  • Author index

    Publication Year: 1993
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    Freely Available from IEEE
  • 1993 (25th) Southeastern Symposium on System Theory

    Publication Year: 1993
    Save to Project icon | Request Permissions | PDF file iconPDF (548 KB)  
    Freely Available from IEEE
  • Development of a PC-based robot hand control algorithm

    Publication Year: 1993 , Page(s): 353 - 357
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB)  

    A force-position control algorithm is used with a two-degree-of-freedom robot hand to simultaneously control the position of an object and the applied grasping force. This original implementation of this control algorithm was limited to a 60-Hz sampling rate. A direct conversion of the original implementation of the algorithm to the C language provided a small speed increase. Detailed profiling te... View full abstract»

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  • Stability and the transient energy method for the classroom

    Publication Year: 1993 , Page(s): 79 - 85
    Save to Project icon | Request Permissions | 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»

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  • Fuzzy logic classification of seismic events

    Publication Year: 1993 , Page(s): 388 - 391
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (248 KB)  

    Two different methods that incorporate fuzzy logic are examined for the classification of seismic events from time-series data. Linguistic descriptors incorporate characteristics such as energy content, clutter, and bursts along with well developed heuristic rules as part of a classification scheme. A direct approach involves preprocessing the waveforms and applying the parametric data to a fuzzy ... View full abstract»

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  • Robust position tracking control for rigid-link flexible-joint robots

    Publication Year: 1993 , Page(s): 358 - 362
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (352 KB)  

    The robust tracking controller for rigid-link flexible-joint (RLFJ) robots presented by D. M. Dawson et al. (1991) is redesigned. The controller exploits aspects of the dynamic model to provide a global uniform ultimately bounded (GUUB) stability result despite the presence of parametric uncertainty, joint flexibility, and mechanical actuator dynamics. The controller delivers the GUUB result for b... View full abstract»

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  • Neural network techniques applied to seismic event classification

    Publication Year: 1993 , Page(s): 343 - 347
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (364 KB)  

    An artificial neural network is incorporated as part of a software simulation system for the purpose of classifying seismic events from waveform data. Unprocessed seismograms are not well suited for presentation to neural networks because of the large number of data points required to represent a seismic event in the time domain. Parametric representation of the seismic event provides adequate inf... View full abstract»

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  • Constrained multivariable control of a diaphragm-type chlorine/caustic electrolyzers using dynamic matrix control

    Publication Year: 1993 , Page(s): 268 - 272
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (264 KB)  

    A multivariable linear dynamic matrix control (DMC) strategy is implemented for a highly nonlinear, electrochemical process with significant dead time. The goal is for the control system to improve energy efficiency by returning the process to the desired operating point or to within control limits in an optimal manner. A comparison of the DMC strategy to traditional control strategies shows impro... View full abstract»

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  • Acceleration of the modal series in the Neumann scattering problem for a hemispherical shell

    Publication Year: 1993 , Page(s): 34 - 36
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (184 KB)  

    A mixed boundary value problem for the scalar acoustic field scattered by an axisymmetric plane wave incident upon a hard hemispherical shell is formulated. The resulting discontinuity in surface pressure is expressed in terms of a complete set of weighted Chebyshev polynomials that satisfy the correct asymptotic edge condition. In this way, the extremely slowly converging modal series of spherica... View full abstract»

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  • SPICE-A system analysis program?

    Publication Year: 1993 , Page(s): 195 - 199
    Save to Project icon | Request Permissions | 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»

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  • Genetic algorithm composes music

    Publication Year: 1993 , Page(s): 223 - 227
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (292 KB)  

    Genetic algorithms (GAs) and thematic bridging are applied to composition. Thematic bridging allows for the specification of thematic material (frequency, duration, and amplitude) to the GA. The GA controls a dynamic operation set that dictates the placement and arrangement of the thematic material View full abstract»

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  • An analytic study of porosity evolution in powder metallurgy forming process

    Publication Year: 1993 , Page(s): 210 - 214
    Save to Project icon | Request Permissions | 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»

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  • Design of a robotic feeder

    Publication Year: 1993 , Page(s): 363 - 367
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB)  

    The use of US Office of Technology Assessment (OTA) recommendations to develop the design specifications of an inexpensive two-degree-of-freedom robot arm for use in rehabilitation applications is described. The current status of the robotic self-feeder is presented along with the mechanical, electrical, and control software design View full abstract»

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  • Pixel-feature-controlling edge detection based on regularization (PEDBOR)

    Publication Year: 1993 , Page(s): 498 - 502
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (560 KB)  

    The PEDBOR algorithm, in which a threshold function is used for all images, is presented. The algorithm is iterative. In each iteration, pixels are first grouped into three categories: edge pixels, homogeneous region pixels, and noise pixels based on the magnitude of the gradient and the orientation distribution of the gradient in the neighborhood of each pixel. After grouping, a regularization pr... View full abstract»

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  • TDNN based speaker identification

    Publication Year: 1993 , Page(s): 396 - 399
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (284 KB)  

    A spatio-temporal network the time delay neural network (TDNN) is considered. Because the TDNN is time-shift invariant, input patterns do not need to be aligned. Also, the TDNN uses temporal information in its mapping process. Experimental results show that a TDNN-based speaker identification outperforms a weighted-distance-measure-based speaker identification system that does not use temporal inf... View full abstract»

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  • Total least squares and constrained least squares applied to frequency domain system identification

    Publication Year: 1993 , Page(s): 285 - 290
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (388 KB)  

    Total-least-squares and constrained-least-squares methods are applied to the Transfer Function Determination Code (TFDC). TFDC is a frequency domain system identification code for determining the SISO input-output transfer function of a system from experimentally derived frequency response data. TFDC is modified to implement a total-least-squares solution, to employ a solution to the combined leas... View full abstract»

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  • An analysis of direct sequence CDMA for mobile cellular systems

    Publication Year: 1993 , Page(s): 571 - 575
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (344 KB)  

    The performance of a code-division multiple-access (CDMA) cellular system for different RF modulation techniques, such as quadrature phase-shift keying (QPSK) and differential phase-shift keying (DPSK), is analyzed. The analysis emphasizes how voice quality deteriorates with increasing system load and determines the maximum acceptable load and minimum acceptable Eb/N... View full abstract»

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  • The effect of random phase variation of turbulence on image resolution

    Publication Year: 1993 , Page(s): 174 - 178
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (264 KB)  

    The turbulence produced by the shearing process between the cooling gas and atmosphere of a hypersonically moving vehicle, which contributes to the image degradation, is addressed. Based on the random phase variation of the optical wavefront, the modulation transfer function (MTF) can be specified to characterize the effect of turbulence on the image resolution. The use of computer simulation to g... View full abstract»

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  • A novel approach to synthesis of threshold functions

    Publication Year: 1993 , Page(s): 200 - 204
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (236 KB)  

    It is noted that threshold elements consist of fewer components and simpler interconnections than the corresponding circuits implemented with conventional gates. The algebra involved in realizing threshold functions is quite different from than the techniques employed for conventional circuits. Existing techniques for synthesis of threshold functions are cumbersome when it comes to practical imple... View full abstract»

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  • The application of linear multivariable control to an AGC system

    Publication Year: 1993 , Page(s): 130 - 134
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (312 KB)  

    An automatic gain control (AGC) system must maintain an electric energy system at a desired operating level. Linear multivariable control is a suitable tool in this case. It is shown how an LQG (linear quadratic Gaussian) controller can be implemented to an AGC system that uses a proportional-integral (PI) controller. This is demonstrated on a two-area interconnected power system. The LQG controll... View full abstract»

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  • Fast, radiation-hard GaAs CHIGFET op amp

    Publication Year: 1993 , Page(s): 159 - 162
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (284 KB)  

    A fast, low-noise, operational amplifier is fabricated in an industrial GaAs technology, exhibiting intrinsic radiation hardness in excess of several hundred megarads. The circuit architecture is based on GaAs/AlGaAs CHIGFETs of 1-μm channel length. The amplifier is fully monolithically integrated with low-frequency open-loop gain of 105 , gain-bandwidth product of 1.5 GHz, DC input ... View full abstract»

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  • Hybrid adaptive compensation for servo disturbances harmonic in displacement

    Publication Year: 1993 , Page(s): 318 - 322
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (288 KB)  

    The authors consider servo systems with geared transmissions, which can experience significant disturbance forces that are periodic in displacement. They assume known spatial frequencies and use this knowledge to reduce the number of parameters required for estimating the disturbance. Use of this partial knowledge of the disturbance is expedited by a continuous-time disturbance model implemented i... View full abstract»

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  • Classroom experiences and student attitudes toward electronic design automation

    Publication Year: 1993 , Page(s): 411 - 415
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (452 KB)  

    The electrical engineering department of Tennessee Technological University recently introduced a significant amount of electronic design automation into its digital systems curriculum, which is used by a number of classes at both the undergraduate and graduate levels. The tools include PSpice, Palasm, and Workview, which supply a broad range of important capabilities. How the tools are used in th... View full abstract»

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  • An expert system for digital switch alarm processing

    Publication Year: 1993 , Page(s): 229 - 232
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (372 KB)  

    An expert system for processing the alarm conditions of a digital telephone switching system is proposed. The resulting expert system saves the user time in reacting to alarm conditions. The expert system makes dealing with system alarms a user-friendlier procedure. Normally, a skilled technician is essential to react to and clear alarm situations. The expert system makes alarm clearing a computer... View full abstract»

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  • Smoothing algorithm for 3-D surface rendering from stereo images

    Publication Year: 1993 , Page(s): 524 - 528
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (360 KB)  

    Methods for determining the three-dimensional (3-D) form of complex objects in a scene from a pair of images using the principles of stereo vision are described. A pair of stereo images are epipolar- or raster-scan-aligned to restrict the search to one dimension along the horizontal lines as a first step in location of image feature points. A correlation window of size 5×5 around a pixel on ... View full abstract»

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