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[1989] Proceedings. The Twenty-First Southeastern Symposium on System Theory

26-28 March 1989

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Displaying Results 1 - 25 of 134
  • Proceedings. The Twenty-First Southeastern Symposium on System Theory (Cat. No.89CH2714-4)

    Publication Year: 1989
    Request permission for commercial reuse | PDF file iconPDF (131 KB)
    Freely Available from IEEE
  • Effects of filtering on estimating spectral moments of meteorological Doppler spectra

    Publication Year: 1989, Page(s):204 - 208
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The authors describe the effort to develop a means of evaluating a clutter-rejection filter based on how it effects the pulse-pair processor spectral estimates of weather data in the absence of clutter. Several clutter-rejection filters are evaluated and compared with a baseline ideal filter. The loss of sensitivity, a measure of the signal power lost as a result of filtering, is also considered i... View full abstract»

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  • Optimal estimation and control of an environmental plant growth chamber

    Publication Year: 1989, Page(s):47 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    A method of controlling the carbon dioxide concentration in an environmental plant growth chamber is proposed for use in investigations of the effect of CO2 concentration on growth rate. A discrete stochastic linear model is developed, and a control law based on the tracking problem of optimal control is used for minimizing the tracking error and the control effort. A Kalman-Bucy filter... View full abstract»

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  • Packing of convex polygons in a rectangularly bounded, non-homogeneous space

    Publication Year: 1989, Page(s):200 - 203
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A two-dimensional heuristic packing strategy, capable of achieving a dense packing of convex polygonal shapes, is presented. A method for extending the placement strategy to nonconvex n-gons is also presented. The algorithm was developed as part of a system to automate the various aspects of the hardwood manufacturing industry. The techniques developed, however, are applicable to the pack... View full abstract»

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  • Determining soil cover percentage by image segmentation

    Publication Year: 1989, Page(s):153 - 157
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    Two image segmentation methods have been developed to determine the soil cover percentage. The first method uses color difference between soil and canopy, and the second method utilizes textural difference between soil and residue. These methods are shown to compare well with the photographic grid method. They were able to measure percentage soil cover quickly, accurately, and with little human er... View full abstract»

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  • Extension of the fast Fourier number theoretic transform to multiple radix

    Publication Year: 1989, Page(s):386 - 389
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A multi-radix fast Fourier number theoretic transform is proposed for the calculation of the discrete Fourier transform of sequences with a prime length P=2k1×3k2×5 k3+1, where k1, k2, and k3 are integers. Advantages include availability of fast algorithms for a set of prime lengths, residue arithmetic with benefit in... View full abstract»

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  • A simple method for generating Lyapunov functions

    Publication Year: 1989, Page(s):42 - 45
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    A method for generating Lyapunov functions that is useful for determining the stability criterion of second-order nonlinear autonomous systems is developed. The idea is based on varying slopes in the phase plane. These slopes define the phase trajectories of the nonlinear system. The method is very simple compared with existing methods. Several examples illustrate this point View full abstract»

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  • A PC-based automated guided probe testing system

    Publication Year: 1989, Page(s):345 - 348
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The physical structure of the PC-based guided probe testing system is presented. Major components of the system are shown, and a discussion of their functioning within the system is given. The guided probe algorithm that is used to locate an error is an analytic process. A typical automatic test pattern generation system will start by simulating a number of random test patterns in order to obtain ... View full abstract»

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  • Pulse-pair spectral estimates in the presence of radar oscillator phase jitter

    Publication Year: 1989, Page(s):195 - 199
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    An approach to the investigation of the effect of phase jitter on spectrum moment estimation errors is discussed. The analysis is based on earlier published results that, in many cases, have been derived through a series of simplifying assumptions. The pulse-pair-/estimator variance expressions are derived using perturbation analysis under the assumption that perturbations are not excessive View full abstract»

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  • New results in image-based tactile sensing

    Publication Year: 1989, Page(s):317 - 321
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A novel image-based sensor surface is defined and presented. It consists of a silicon-rubber skinlike material separated from a transparent plexiglass medium by a small air gap. The plexiglass is used to translate surface deformations into a focused image, which is then sensed by a light-sensing array. The size of the image of this touch surface (image footprint), under various deformations, remai... View full abstract»

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  • Real time digital signal processing applications with IBM-PC and TMS 320

    Publication Year: 1989, Page(s):576 - 582
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The use of the IBM personal computer to control the Miller profiler to perform real-time deep level transient spectroscopy measurements is described. The implementation of a real-time recursive adaptive line enhanced on the Texas Instruments TMS320 programmable digital signal processor is also presented. The software logic and flow of each of the adaptive stochastic programs, the TMS320 processing... View full abstract»

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  • Discourse management in intelligent, multimodal user interfaces

    Publication Year: 1989, Page(s):662 - 665
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Recent advances in software and hardware are allowing researchers to implement user interfaces that are able to communicate with the user in multiple modes, such as text, video and audio. Many multimedia interfaces are knowledge based as well. With the richness of presentation modes available, the discourse manager must make many complex decisions to choose the appropriate mode or modes to be used... View full abstract»

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  • Si diode under avalanche breakdown as a light emitting source for VLSI optical interconnect

    Publication Year: 1989, Page(s):677 - 680
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    Light-emission properties of a reverse-biased silicon diode under avalanche breakdown are investigated for optical interconnections for VLSI systems. Silicon, being an indirect bandgap semiconductor, is a poor material for light emission from forward biased diodes. The optical emission at reverse breakdown is weak but is coupled to an optical fiber and detected by a photodiode, indicating its pote... View full abstract»

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  • Adaptive order recursive lattice for optical target detection using correlated frames

    Publication Year: 1989, Page(s):148 - 152
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    An adaptive order-recursive least-squares procedure for the detection of an optical target in a heavy clutter environment is introduced. The procedure makes use of the correlated noise (clutter) in the adjacent frames of a scene to suppress the clutter and to detect efficiently the optical target embedded in one of the frames. It does not require much information about the sequence of images, the ... View full abstract»

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  • Large-capacity, noise-filtering, multi-level, associate memory system

    Publication Year: 1989, Page(s):412 - 416
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The dynamical properties of a neural circuit are studied by means of a modified Lyapunov theory. These properties include the criteria of stability, the domain of convergence, the initial-to-final mapping, and the programming of the connection matrix. All the theoretical predictions are verified numerically by computer experiments. Practical applications of this system are discussed View full abstract»

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  • Solving nonlinear programming problems through simulations of neural networks on a personal computer

    Publication Year: 1989, Page(s):441 - 444
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    An approach for finding the solutions of nonlinear programming problems is presented. In this approach, dedicated electronic circuits, known as neural networks, for solving nonlinear programming problems are simulated with a circuit analysis program. The advantage of the approach is the flexibility in changing the component values and the fact that random noise representing uncertainty can also be... View full abstract»

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  • Random number generator for 16-bit machines

    Publication Year: 1989, Page(s):84 - 88
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A general 16-bit multiplicative congruential generator is developed and tested using the chi-square goodness-of-fit test and the Kolmogorov-Smirnov test. The generator is simple and is shown to have good randomness properties for the generation of uniform random numbers. It is also shown that this generator is portable in the sense that it does not overflow the 16-bit computer or require a double-... View full abstract»

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  • Electromagnetic launchers

    Publication Year: 1989, Page(s):380 - 384
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Research programs are conducted for developing weapon systems based on electromagnetic launcher technology. An overview is given of this technology, which has the capability of imparting projectile velocities higher (in excess of 3 km/s) than those able to be obtained with conventional cannon systems. A comparison of coaxial and parallel railguns indicates that the coaxial system has some advantag... View full abstract»

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  • The pseudorandom sequence of arrays

    Publication Year: 1989, Page(s):138 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    Pseudorandom sequences, also known as maximal-length sequences, are generated by 1/D(z), where the denominator is a primitive polynomial of a given degree. The pseudorandom sequence of arrays (PRSA) is generated by N(z)/D(z ), where for a fixed D(z) the numerator polynomial varies over an arbitrary set of linearly independent ... View full abstract»

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  • Probability density update for a distributed system based on unnormalized local densities

    Publication Year: 1989, Page(s):38 - 41
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    A method for producing a normalized probability density for a global system state constructed from the unnormalized densities of the local models is given and proved. The local densities are required to be solutions to Kushner's equation, which is unsolvable in the general case. The formulation uses unnormalized local densities, which are solutions of the more tractable Zakai equation, and yet pro... View full abstract»

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  • Image enhancement and processing for positron emission tomography

    Publication Year: 1989, Page(s):513 - 517
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A filtering method for positron emission tomography is proposed. The image is converted from the rectangular x-y coordinate system to the polar ρ-θ coordinate system. This causes the radial noise to map into horizontal lines. Using the Fourier transform, radial noise is then mapped into and around the vertical axis of the Fourier spectrum in the corresponding ω-&t... View full abstract»

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  • Analysis of a multiple-bus multicomputer system

    Publication Year: 1989, Page(s):340 - 344
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The author presents statistical models, simulation and experimental results, and an implementation of a multicomputer system particularly suited for applications where a set of operations must be performed on a stream of data blocks, such as in the processing of large number of images. This system consists of N satellite computers and M central computers interconnected by ... View full abstract»

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  • An algorithm for reducing circuit equations in computer applications

    Publication Year: 1989, Page(s):104 - 108
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Computer formulation of circuit equations using the modified nodal analysis is discussed. The modified nodal formulation gives rise to an unproportionately large number of circuit equations, even for small networks. An algorithm is presented to reduce these equations to a very small number, thereby reducing the memory requirement, as well as runtime, for the solution network responses. Though it i... View full abstract»

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  • Nonplanar surface profile measurements systems

    Publication Year: 1989, Page(s):533 - 535
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    The authors present a nonplanar surface profile measurement method wherein in-plane and out-of-plane coordinates are independently measured using two different techniques, and the data are correlated to give an overall surface profile. The first technique uses computer-controlled optical equipment to determine the in-plane grid locations in an x -y coordinate system. In the other... View full abstract»

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  • Architectures for polynomial evaluation

    Publication Year: 1989, Page(s):190 - 194
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    A regular architecture is proposed for the evaluation of polynomials of arbitrary degree. Control of the execution is accomplished with cube-type instruction. The time complexity is derived. The basic design is easily adapted to a pipeline structure. The study also shows that the constraint of regularity may make faster algorithms unsuitable for certain implementations View full abstract»

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