Proceedings The Twenty-Ninth Southeastern Symposium on System Theory

9-11 March 1997

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  • Proceedings The Twenty-Ninth Southeastern Symposium on System Theory

    Publication Year: 1997
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    Freely Available from IEEE
  • Mathematical system theory and digital control

    Publication Year: 1997, Page(s):7 - 11
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 KB)

    This paper is dedicated to the formal definition of a dynamical system controlled by a digital device. Starting from general considerations, we introduce the "natural" state space and turn then to its simplification using mathematical arguments. Finally we relate this state space to the common real space and show how the digital system theory proposed here encompasses the usual control theory. View full abstract»

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  • The automatic design method of relay systems and cubicle structure and their CAD realization

    Publication Year: 1997, Page(s):379 - 383
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (477 KB)

    This paper consists of two parts. The first part discusses the general method used in automatically generating the prime drawings of relay systems and CAD realizations. A database of the basic units of the relay system was created. An expert system was integrated with topological graph search method in order to create the general drawings of the relay system. According to the customer's requiremen... View full abstract»

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  • Author index

    Publication Year: 1997, Page(s):553 - 554
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    Freely Available from IEEE
  • Linear state-variable control laws with reduced-order observers may produce unstable feedback controllers

    Publication Year: 1997, Page(s):302 - 308
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Prior to 1979, it was a commonly held belief among modern control researchers that a stabilizing linear feedback control law u=Kxˆ, where xˆ is obtained from a state observer, would always produce a stable “controller” u(s)=G(s)γ(s) for any completely controllable/observable linear plant x˙=Ax+Bu. However, in a 1979 paper it was proven that, in fact, the controller ... View full abstract»

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  • Aeolotropic filter design and measurement gating for remote tracking with gridlock error

    Publication Year: 1997, Page(s):75 - 80
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Analyzes the effect of gridlock (i.e. alignment) errors on a target track filtering algorithm used for tracking with radar measurements from a remote platform. The case considered is that in which two ships are located in a 2D Cartesian coordinate system, and radar measurements from one (remote) platform are used by another (local) platform to estimate the target position and velocity in the local... View full abstract»

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  • Machine vision processing/selection in printed circuit board manufacturing

    Publication Year: 1997, Page(s):190 - 194
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Machine vision applications are common in the manufacturing of PWBs. Machine vision systems are used in the placement of surface mount devices with lead pitch of 0.025 inch or less. There are two steps in the successful placement of surface mount devices, as follows: (a) The location of the device on the vacuum tip which picks and places the device must be determined. Translation and rotational of... View full abstract»

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  • Cryogenic fluid flow modeling at NASA's Stennis Space Center

    Publication Year: 1997, Page(s):343 - 347
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Computational models for dynamic fluid flow simulation are needed to predict pressures, temperatures, flowrates, and other quantities in present and future testing at the Component Test Facility (CTF) at NASA's Stennis Space Center (SSC). The Rocket Engine Transient Simulation (ROCETS) package, and Boeing Computer Services' EASY5x are the two major components of the EASY/ROCETS dynamic fluid flow ... View full abstract»

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  • Asynchronous track fusion revisited

    Publication Year: 1997, Page(s):118 - 122
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Recently the authors derived an asynchronous track fusion algorithm that combines tracks provided by different sensors with different sampling rates and communication delays (A.T. Alouani and T.R. Rice, 1996). In that algorithm, its dynamics propagates between updates, then it uses the tracks provided by the local processors (LPs) to update its track. The paper deals with the same problem except t... View full abstract»

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  • Equalization of very high speed wire data channels

    Publication Year: 1997, Page(s):281 - 285
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Continuous-time adaptive signal processing has proved extremely effective in combating problems faced in wide bandwidth applications. This paper deals with the development of a continuous-time equalization scheme that would facilitate higher data transfer rates (in the range of 500 Mb/s to 4 Gb/s) in computer data channels while keeping the bit error rates low, i.e. in the region of 10-20 View full abstract»

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  • Reactive power compensation on distribution feeders

    Publication Year: 1997, Page(s):366 - 371
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    The optimal sizing and placement of shunt capacitors on distribution feeders has received considerable attention from researchers for many years. This paper provides an analysis of several of the general solution methods found in such literature. The validity of certain simplifying assumptions are addressed and additional insights are provided View full abstract»

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  • The design and implementation of a time-varying observer and an EMA controller for linear systems

    Publication Year: 1997, Page(s):297 - 301
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A method is developed for the design of a class of observers which will handle time-varying linear systems. The time-varying linear system is stabilized by steering the extended-mean values of all closed-loop ED-eigenvalues into the left-half plane, so that bounded-input bounded-output stability of the closed-loop system is guaranteed. This principle is analogous to the eigenvalue (pole) placement... View full abstract»

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  • α-β target tracking with track rate variations

    Publication Year: 1997, Page(s):70 - 74
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Considers the theoretical and practical implementation of the α-β tracking process under the influence of track rate variations and/or track period perturbations. These considerations are necessary when the α-β tracker is used in the Benchmark 96 target tracking problem, a challenge to the tracking community to generate tracking solutions to for a set of maneuvering targets u... View full abstract»

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  • Parallel total weight crossing number algorithm for channel routing on a linear array with a reconfigurable pipelined bus system

    Publication Year: 1997, Page(s):183 - 187
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    In the channel routing problem, terminals between cells are interconnected completely while reducing channel routing area. The crossing number, the number of crossings between two wires in the channel, is related to the channel routing area. In this paper, we present a parallel algorithm finding a weighted total crossing number in the channel by using LARPBS model (Linear Array with a Reconfigurab... View full abstract»

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  • A methodology for performing secure data compression

    Publication Year: 1997, Page(s):266 - 270
    Cited by:  Papers (7)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A semi-adaptive time variant modeling method is developed to be used in conjunction with an arithmetic coder to compress data in a secure fashion. The modeling method introduces randomness into the symbols coding probabilities by ensuring that the update time for computing the coding probabilities is performed at random intervals as specified by the output of a stream cipher. The method results in... View full abstract»

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  • A fuzzy logic based handwritten numeral recognition expert system

    Publication Year: 1997, Page(s):34 - 38
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    We present a syntactic method for handwritten numeral recognition using the concept of fuzzy logic. We develop a fuzzy expert system that is capable of handling vagueness in describing each class of numerals. The proposed expert system consists of two main parts. First, the preprocessing part includes the feature extraction step that provides sufficient information to the inference engine. Second,... View full abstract»

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  • Mixed filtering and intelligent control for target tracking with mobile sensors

    Publication Year: 1997, Page(s):114 - 117
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    We address the problem of tracking a moving target with a mobile camera. We discuss the whole perception-decision-action process, including the image processing and the control loop. Then we turn to the theoretical proof of the stability of our control law in closed loop with the image processing View full abstract»

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  • Design of a service failure database for determining distribution reliability using approved reporting standards

    Publication Year: 1997, Page(s):354 - 358
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    This paper defines a software engineering problem to create a service failure database for the Cookeville Electric Department, a local distribution utility. Using reporting standards approved by the American Public Power Association (APPA), reliability indices such as CAIDI, SAIFI, ASAI and SAIDI were generated for a three year period. Through a Classical Software Engineering Paradigm, user friend... View full abstract»

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  • Intelligent PDAF: refinement of IPDAF for tracking in clutter

    Publication Year: 1997, Page(s):133 - 137
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    An intelligent probabilistic data association filter (IPDAF) is presented as a refinement of the original IPDAF developed by D. Musicki et al. (1994). The refinement includes the incorporation of measurement feature information, a better estimator of clutter density, and an important correction of a mistake in the original PDAF and IPDAF. Simulation results demonstrate the substantial superiority ... View full abstract»

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  • Reduction of sidelobes in the responses of optimal filters implemented on some SLMs

    Publication Year: 1997, Page(s):277 - 280
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    Spatial light modulators (SLMs) are used to implement optical correlation filters for real time pattern recognition. These SLMs have characteristics that are of limited range in the complex plane. Methods have been proposed to design optimal filters implementable on these constrained SLMs. In an earlier work it was observed and reported that the response of these optimal filters for some constrain... View full abstract»

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  • Virtual local area network technology and applications

    Publication Year: 1997, Page(s):49 - 52
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The paper gives the details of VLAN technology and explains not only how it works, but also explains the different types of VLANs and where they should be in a network. Some real world networks and some of the common problems associated with those traditional layouts are discussed. The author then integrates switches into those problem networks and examines the effect View full abstract»

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  • On the application of ehD2 to evaluate integrals

    Publication Year: 1997, Page(s):64 - 68
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    We derive some results on determining the exponential of a derivative squared and apply it to several integrals including a communication theory integral. Using this technique, one can, in principle, compute the expected value of any function whose variables are Gaussian distributed. Some generalizations to defining functions defined as operators acting on other functions is also briefly considere... View full abstract»

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  • An architecture for a high speed fuzzy logic inference engine in FPGAs

    Publication Year: 1997, Page(s):179 - 182
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Fuzzy logic arithmetic requires more processing power than traditional methods. To overcome this problem a four stage two datapath fuzzy logic inference engine is proposed. Each stage and datapath operates in parallel when possible to reduce total processing time. The inference engine architecture is designed to be used to control a two link robot arm and to work in an FPGA implementation View full abstract»

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  • Further consideration of an electromechanical thrust vector control actuator experiencing large magnitude collinear transient forces

    Publication Year: 1997, Page(s):338 - 342
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Thrust vector control (TVC) for the Space Shuttle Main Engines (SSMEs) is accomplished by hydraulic servo actuators. Marshall Space Flight Center (MSFC) is developing electromechanical actuator technology to be physically and functionally interchangeable with the existing hydraulic actuator. One of the major concerns for this design task is the large transient loads experienced by the TVC during s... View full abstract»

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  • Thyristor controlled AC induction motors using a discrete frequency control method

    Publication Year: 1997, Page(s):164 - 167
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The AC thyristor controllers have been traditionally used for starting induction motors to reduce the current. In this work it is proposed that the utilization of the AC thyristor controllers be used like inverters by increasing the frequency in discrete steps until the line frequency is reached. These discrete steps are sub-multiples of the line frequency. They are generated by the omission or in... View full abstract»

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