Proceedings of 26th Southeastern Symposium on System Theory

20-22 March 1994

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  • Proceedings of 26th Southeastern Symposium on System Theory

    Publication Year: 1994
    Request permission for commercial reuse | PDF file iconPDF (130 KB)
    Freely Available from IEEE
  • An evaluation of three multicast routing algorithms

    Publication Year: 1994, Page(s):365 - 370
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    This paper looks at the operation of the three multicast routing algorithms being studied for use in an inter-domain routing environment. The three algorithms are Scalable Reverse Path Multicasting, Core Based Trees, and Protocol Independent Multicasting-Sparse Mode. These three algorithms are evaluated with respect to a list of criteria to determine how well they scale to the large sizes of inter... View full abstract»

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  • Implementation and performance evaluation of cellular array multipliers using FPGAs

    Publication Year: 1994, Page(s):224 - 228
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The design of fast and efficient multipliers is imperative, because of its various applications in many areas of science and engineering. In the light of VLSI technology, it is important for computer hardware designers to be aware of the choices available to them, in selecting an efficient algorithm for their application. High speed cellular-array multipliers have been the logical and affordable i... View full abstract»

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  • The impact of correlation on delay performance of high speed networks

    Publication Year: 1994, Page(s):371 - 374
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    This paper focuses on the impact of correlation on the delay performance of high speed networks. Markov-modulated Poisson process (MMPP), which captures both burstiness and correlation between interarrival times, is used to model packet arrival processes in high speed networks. Only one hop of a high speed network is studied since queueing networks can be approximately analyzed by decomposing the ... View full abstract»

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  • A comprehensive approach to the design of digit-serial modified booth multipliers

    Publication Year: 1994, Page(s):229 - 233
    Cited by:  Papers (4)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Presents a novel approach to the design and gate-level implementation of digit-serial modified Booth multipliers. The proposed approach is based on the decomposition of the multiplicand and the multiplier each into a unique set of D radix-2D components, where D represents the digit-size being used. This permits the desired final product to be formed in terms of the decomposed components... View full abstract»

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  • Application of computer simulation in estimating geological reflector locations

    Publication Year: 1994, Page(s):198 - 202
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The objective of this paper is to improve algorithms for reconstructing the geometric configuration of acoustic reflecting surfaces. A recent modification to the conventional migration method of locating these surfaces is briefly discussed. This procedure results in two outputs: one can be used to reconstruct the shape of the unknown acoustic reflector, while the second output estimates the acoust... View full abstract»

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  • Measurement and analysis of key and frame processing time in a communications controller

    Publication Year: 1994, Page(s):375 - 378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Reported here are measurement methods developed to time the execution of specified events taking place in a communications controller. Overall objective was to arrive at a well-defined, well-documented model that allowed communication systems engineers the ability to rapidly modify the communications controller's software. Data key and frame processing were the specific areas of code that were mea... View full abstract»

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  • The optimization of vector quantizers by minimizing variance

    Publication Year: 1994, Page(s):581 - 584
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    This paper presents the results of the optimization of a vector quantizer designed to quantize the coefficients from the transform coding of black and white images. Eight images were coded using 4×4 blocks of pixels which were in turn transformed using the discrete cosine transform. Three separate methods of optimization were investigated including the Linde-Buzo-Gray (1984) method, a simula... View full abstract»

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  • An investigation of the variation of alternating current characteristics of electrical insulation materials used on spacecraft power systems

    Publication Year: 1994, Page(s):236 - 238
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The electrical insulating materials used on spacecraft power systems degrade due to their exposure to a hostile environment. This environment consists of high energy protons, electrons and space plasma. The extreme thermal changes when the spacecraft is facing the Sun or when eclipsed by the Earth presents another cause for the degradation of the material. The alternating current properties, which... View full abstract»

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  • Fuzzy modelling of dynamic systems

    Publication Year: 1994, Page(s):168 - 171
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    This paper deals with fuzzy modelling of complex dynamic systems. Fuzzy relational equations are used to describe dynamic systems' behavior. A prediction algorithm is proposed and the procedure to update the fuzzy relation of the model as new measurements are collected is discussed. The algorithm is applied to the prediction of chaotic time-series View full abstract»

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  • A survey of incipient fault detection and location techniques for extruded shielded power cables

    Publication Year: 1994, Page(s):402 - 405
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The existing techniques for the detection and location of incipient faults (e.g. electrical trees) in extruded shielded power cables are reviewed. Only the techniques developed for field applications are included. The advantages and disadvantages of each technique are evaluated from the point of view of a power engineer. The desired features of an ideal incipient fault detection and location syste... View full abstract»

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  • Underwater source localization with a generalized likelihood ratio processor

    Publication Year: 1994, Page(s):203 - 207
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The author describe a new matched-field acoustic source localization technique using reduced-rank signal processing. The problem is posed as a simultaneous detection and parameter estimation in which unknown, deterministic noise will act to obscure the source. They derive a reduced-rank likelihood ratio array processor and demonstrate its ability to detect and localize the signal of interest. The ... View full abstract»

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  • Trade-offs in designing a VHDL simulation tool for digital VLSI

    Publication Year: 1994, Page(s):380 - 384
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The authors present an original logical simulation tool called ASIMUT and discusses the considerations that have driven the design of this tool. ASIMUT uses a VHDL description. It is freely distributed through the ALLIANCE CAD System (a complete CAD system for digital VLSI design). First, they present the VHDL subset supported by the compiler and, the way this subset has been defined. In a second ... View full abstract»

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  • Direct sequence CDMA design for mobile cellular systems

    Publication Year: 1994, Page(s):585 - 589
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Code division multiple access (CDMA) technology using direct sequence has been investigated as a worthy candidate for future digital cellular telephone and personal communication network (PCN) applications. In this paper the authors have studied and investigated the performance of code division multiple access mobile radio communication systems. Specifically, the investigation was focused on syste... View full abstract»

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  • Cost-benefit analysis of electric power system reliability

    Publication Year: 1994, Page(s):468 - 472
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The purpose of this investigation is to determine an appropriate cost-benefit formula that will help the power system planners in prioritizing transmission system projects. This paper deals with describing the value of increased reliability and security in bulk power systems. Three different approaches used for prioritization of transmission system projects by the electric utilities are discussed ... View full abstract»

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  • Implementation of abstract interpretation algorithms by means of attribute grammar

    Publication Year: 1994, Page(s):87 - 92
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    In logic programming, “dixit” Bruygnooghe, the purpose of abstract interpretation is the construction of a finite AND/OR tree and the “computation” of a correct abstract substitution at each node of that tree. The authors consider an abstract substitution as an attribute attached to the nodes of a tree, and then the propagation process of abstract substitutions through the ... View full abstract»

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  • An intelligent voltage controller for static VAr compensators

    Publication Year: 1994, Page(s):239 - 243
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The paper presents a novel AI-rule based intelligent controller for a fixed capacitor-thyristor controlled reactor (FC-TCR) static VAr compensator (SVC). The intelligent voltage regulator is based on the concept of the error excursion plane where the stabilizing action is scaled by the magnitude of the excursion voltage error vector, in order to ensure adequate compensation. The proposed rule base... View full abstract»

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  • Global optimization of stochastic multivariable functions

    Publication Year: 1994, Page(s):323 - 326
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    This paper presents a new methodology for global optimization of a stochastic multivariable functions subject to stochastic, possibly nonlinear constraints. Least squares parametric estimation is applied as an intermediate step in the stochastic optimizer which then uses a special transformation to capture the global optima estimate. A comparative study of implementing estimation in polynomial lea... View full abstract»

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  • Fuzzy logic based suspension system

    Publication Year: 1994, Page(s):172 - 176
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The purpose of a vehicle suspension system is to balance the tradeoff between ride quality and handling performance. This is achieved by controlling the relative position and motion between the vehicle body and wheels in order to reduce the effects of variations in the road profile. Good handling requires a stiff suspension to maintain tire contact with the road. On the other hand, good ride requi... View full abstract»

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  • Using EASY5 to investigate filtering of power system area control error

    Publication Year: 1994, Page(s):406 - 410
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The area control error (ACE) is an indication of the mismatch between generation and load demand of a power system. This signal is an integral part of the automatic generation control (AGC) system which seeks to match area generation and load on a moment to moment basis. High frequency load variations and noise in the ACE signal can cause unnecessary and unwanted control action to occur. This pape... View full abstract»

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  • Parametric modeling and reconstruction of acoustic signals

    Publication Year: 1994, Page(s):208 - 212
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The authors report on the development and performance evaluation of parametric signal processing algorithms for extracting a mixed stochastic signal process from its wideband noise corrupted measurements. The signals under consideration are acoustic with periodic components masked by wideband colored noise. First, the unbiased autocorrelation function (ACF) sequence is estimated from the data. The... View full abstract»

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  • New algorithms for static and dynamic sensitization of paths in timing analysis

    Publication Year: 1994, Page(s):385 - 389
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Describes two algorithms in order to bring up a new solution to the well known problem of paths sensitization in timing analysis. The first algorithm PSV (path sensitizability verification) determines whether or not there is a pattern that activates a given path. If not, the path is called a false path. Then the second algorithm SPS (substitute path search) will find out the new longer path in a f... View full abstract»

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  • Determination of the optimal beta gimbal angles for the solar arrays of the space station using a neural network

    Publication Year: 1994, Page(s):69 - 73
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The current baseline solution for minimizing the potential of dynamic loads being imparted onto the solar arrays of the Space Station during proximity maneuvers by the Space Shuttle is to lock the position of the solar arrays throughout the approach/departure of the Space Shuttle. However, if the a priori locked position does not optimally feather the solar arrays throughout the Shuttle's approach... View full abstract»

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  • Real-time histogram generation using optical scanning

    Publication Year: 1994, Page(s):310 - 314
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A prototype of an optical-electronic histogram generator has been designed and tested for 1-D objects. In this scheme, the object to be analyzed is laser scanned. The resulting optical signal is detected by a photodetector which generates an electrical signal output which is subsequently analyzed with a combination of analog and digital electronics. The system has shown to be fairly modular in des... View full abstract»

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  • Biorthogonal wavelets for waveform coding in BPSK and QPSK systems

    Publication Year: 1994, Page(s):590 - 594
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The authors consider the use of biorthogonal wavelets for baseband waveform coding in traditional BPSK and and PSK digital communication systems. Biorthogonal wavelets can be designed to give better spectral characteristics than orthogonal wavelets. Numerical results for power bandwidth and bandwidth efficiency are given as evidence. A new configuration for the receiver is also presented, where th... View full abstract»

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