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Southeastcon '94. Creative Technology Transfer - A Global Affair., Proceedings of the 1994 IEEE

Date 10-13 April 1994

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Displaying Results 1 - 25 of 112
  • Proceedings of SOUTHEASTCON '94

    Publication Year: 1994
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    Freely Available from IEEE
  • Temporal gain and energy density profiles for a carbon dioxide laser beam amplifier

    Publication Year: 1994, Page(s):67 - 69
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The four-temperature kinetic model of Harrach and Einwohner is used to study the performance of a carbon dioxide electron-beam initiated laser amplifier. The model takes into account the effect of adding nitrogen and helium gases, radiation terms and the temperature dependence of vibrational energy transfer rates. Based on this model, a program was written in automatic continuous simulation langua... View full abstract»

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  • The block optimal realization of denominator-separable 2-D digital filters

    Publication Year: 1994, Page(s):93 - 97
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The problem of block optimal realizations of separable-in-denominator 2-D filters are considered. A general partial fraction expansion of a denominator separable 2-D transfer function is presented. Based on such expansion a new block optimal realization is derived with emphasis on real time processing in multiprocessor environment. In sequel, maximum parallelism, pipelining, reduction throughput d... View full abstract»

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  • Object counting and sizing

    Publication Year: 1994, Page(s):380 - 382
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    To assess taxes on citrus groves, the Property Appraiser offices in Charlotte county, Florida, use aerial photographs of the groves and manually count the trees. The process was inefficient and the error margin large. We describe the system that we developed to electronically scan the aerial photographs, transform them into digital images and use pattern recognition to count, size, and find locati... View full abstract»

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  • Lightning performance tests on 115 kV transmission line models with spline ball ionizers

    Publication Year: 1994, Page(s):288 - 291
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    This paper presents the results of an investigation of the lightning performance of a transmission line with spline ball ionizers. An experimental investigation was conducted to determine the critical flashover (CFO) voltage between a scale model of a charged cloud and a transmission line with spline ball ionizers. The CFO voltages for the standard lightning impulses were measured for both positiv... View full abstract»

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  • New adaptive detection filters using Newton-type algorithms

    Publication Year: 1994, Page(s):403 - 407
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    An adaptive detection filter detects the presence of a desired signal in noisy environment. In this paper, we present several detection filtering algorithms in the time domain. Our algorithm's vector forms are compared with gradient search methods include Newton, steepest descent and least-mean-square. We find that our algorithms are of the Newton-type View full abstract»

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  • HFDDI: a hierarchical approach to FDDI networking

    Publication Year: 1994, Page(s):254 - 257
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A hierarchical networking strategy for the fiber distributed data interface, HFDDI, is presented, that offers solutions to the problem of performance degradation due to large numbers of stations on an FDDI ring, and the geographical distance. The hierarchical decomposition in HFDDI allows to reduce the network into manageable clusters, encouraging modularity, scalability, and cost effectiveness. T... View full abstract»

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  • An enhanced assessment protocol to support the dynamic bandwidth control capabilities in DQDB MANs

    Publication Year: 1994, Page(s):204 - 208
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    An enhanced assessment protocol (EAP) is proposed for DQDB MANs. The proposed scheme comprises of two independent assessment cycles. The DANT cycles continuously update time dependent network information. The perception cycles estimate the required change in the perception of the node population in the network, to serve the existing demand pattern better and supports dynamic bandwidth control View full abstract»

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  • Finite wordlength effects in fixed-point 2-D digital filters

    Publication Year: 1994, Page(s):16 - 20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The stability of 2D digital filters implemented with two's complement quantization is investigated. The difference equation model is considered for the following cases: quantization after each product, and quantization after a complete sum of products. For both cases, sufficient conditions are established for asymptotic stability. The 2-D state-space Roesser's model is also considered under two's ... View full abstract»

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  • Static converter: didactic support software

    Publication Year: 1994, Page(s):311 - 315
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Teaching a course of special electric loads in a continuing education program to power engineers is a difficult task because they are not familiarized with switching topology circuits. Normally, in a typical program, many hours are dedicated to explain the thyristors switching sequence and to draw the power converter currents and terminal voltages waveforms for different operative conditions. This... View full abstract»

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  • Comparison of commercially available FPGA architectures

    Publication Year: 1994, Page(s):383 - 385
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Field Programmable gate arrays (FPGAs) are erasable, programmable PLDs and structurally, can be divided into three classes: symmetrical arrays, row-based, and hierarchical PLDs. The architecture, interconnection structure, and advantages and limitations of each class are discussed and a comparison between these classes is made. As an example of each class, FPGAs from Xilinx, Altera, and Actel are ... View full abstract»

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  • Classification of periodic patterns using Hough transform

    Publication Year: 1994, Page(s):367 - 371
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Texture is an important characteristic in an image, and it is used to identify objects or regions of interest within an image. The problem of texture classification has been widely studied and most of the proposed techniques fall into two categories: statistical or structural. In this paper, a structural approach based on the Hough method for line detection is proposed for the description of perio... View full abstract»

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  • Neurocontroller with adaptable activation function for power system studies

    Publication Year: 1994, Page(s):292 - 294
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    In this paper the performance of a neural network with an activation function with constant and adaptable slope is presented. Later the network can be used as a neurocontroller to estimate the state and isolate the faulty power system from the rest of the system. The method is illustrated with an example View full abstract»

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  • DSP controller for a permanent magnet synchronous motor drive

    Publication Year: 1994, Page(s):413 - 417
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The drives industry is steadily moving towards digital implementation of controllers for variable speed drives. This paper discusses the implementation of a DSP controller for controlling a permanent magnet synchronous motor (PMSM). It discusses the theory of operation of a PMSM drive and shows how a DSP controller has been designed to perform the vector and current control functions. The design c... View full abstract»

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  • Solution of the waveguide problem by a method based on the integral definition of the curl operator

    Publication Year: 1994, Page(s):209 - 211
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    The definition of the curl operator in terms of an integral is shown to lead to a method for numerical solutions. In the paper, the derivation of this method, as well as examples for waveguides are presented View full abstract»

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  • Stationary and cyclostationary random process models

    Publication Year: 1994, Page(s):450 - 454
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Cyclostationary random process modeling is an area of signal processing that has been the subject of numerous journal papers. W.A. Gardner (1988) devoted half of a book to cyclic spectral analysis. Cyclostationarity, however, has not received very much attention at regional conferences in the recent past, which implies that it is not being utilized by many practising engineers. Therefore, this pap... View full abstract»

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  • Error analysis of quantized weights for feedforward neural networks (FNN)

    Publication Year: 1994, Page(s):475 - 479
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    When a neural network is implemented with limited precision hardware, errors from the quantization of weights become important factors to be considered. In this paper, the authors present several analysis results based on general FNN structures and use several examples to examine the relation between weight errors and output classifications. A lower bound for L, the number of bits used to quantize... View full abstract»

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  • Effect of system optical configuration on visibility profiles for circularly polarized backscattered laser beam

    Publication Year: 1994, Page(s):60 - 63
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Based on the laser Doppler anemometry technique and Mie scattering theory, the visibility-particle size relationship (visibility profile) is computed for spherical particles of complex index of refraction. The analysis is restricted to the backscatter direction, for incident light that is circularly polarized. It is observed that the shape of the visibility profile is greatly influenced by the ind... View full abstract»

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  • A fixed point implementation of the backpropagation learning algorithm

    Publication Year: 1994, Page(s):136 - 138
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    In hardware implementations of digital artificial neural networks, the amount of logic that can be utilized is limited. Due to this limitation, learning algorithms that are to be executed in hardware must be implemented using fixed point arithmetic. Adapting the backpropagation learning algorithm to a fixed point arithmetic system requires many approximations, scaling techniques and the use of loo... View full abstract»

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  • Comparison of measured and calculated CFO voltages for 115 kV and 230 kV substations

    Publication Year: 1994, Page(s):285 - 287
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    This paper presents both experimental results and calculations of CFO voltages for 115 kV and 230 kV substations. Several different methods are used to calculate the CFO voltage. The accuracy of specific equations and a graphical method used for the evaluation of CFO voltages for HV substations are discussed. The paper concludes with a discussion and analysis of equations used for the estimation o... View full abstract»

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  • Adaptive control of robot manipulators in task space

    Publication Year: 1994, Page(s):147 - 151
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    This paper considers adaptive control of robot manipulators in task space. An adaptive sliding-mode control scheme is combined with nonlinear integral control to derive a globally stable adaptive control algorithm. With this algorithm, the robustness is guaranteed by the sliding-mode control law and the chattering associated with sliding mode control is eliminated by the integral control law. With... View full abstract»

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  • Formulation of capacitance of rapid thermal annealed junction

    Publication Year: 1994, Page(s):120 - 122
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    This paper provides an analytical expression for charge distribution and electric field of a rapid thermally annealed junction device. A numerical method is used and simulated results are compared with the experimental values. Our results indicate that Rapid Thermal Annealed process is a valid and economical method to produce microwave devices View full abstract»

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  • Digital processing for non-stationary narrow-band interference suppression in fading channels

    Publication Year: 1994, Page(s):408 - 412
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The suppression of narrow-band interference has long been a concern in direct-sequence spread spectrum (DS-SS) communication systems. Recently, transform domain processing (TDP) approaches have been used to suppress intentional interference. This paper extends previous work done in the area of TDP utilizing non-linear rank order filters, namely conditional median filters (CMFs). The paper confront... View full abstract»

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  • A harmonic model of a 2-pulse DC motor drive operating in the continuous current mode

    Publication Year: 1994, Page(s):40 - 44
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A harmonic model of a DC motor drive operating in the continuous current mode fed by a single-phase source is developed. The traditional constant armature current model predicts a square wave line current which has spectral characteristics independent of operation conditions. The electrical equations of the equivalent armature circuit of the DC machine are solved. A Fourier analysis of these equat... View full abstract»

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  • Some new results on stability and stability robustness of Fornasini-Marchesini state-space 2-D digital filters

    Publication Year: 1994, Page(s):21 - 25
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The paper describes a Lyapunov approach to stability and stability robustness analysis for 2D digital filters in the Fornasini-Marchesini local state-space setting (E. Fornasini and G. Marchesini, 1980). A class of new constant 2D Lyapunov equations, that generalize the 2D Lyapunov equation proposed recently by T. Hinamoto (1993), is described. It is shown that the generalized 2D Lyapunov equation... View full abstract»

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