By Topic

1994 Proceedings of Canadian Conference on Electrical and Computer Engineering

25-28 Sept. 1994

Filter Results

Displaying Results 1 - 25 of 206
  • Applying MATLAB and C to monitor wind and ice loads on a test transmission line

    Publication Year: 1994, Page(s):159 - 164 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB)

    Newfoundland and Labrador Hydro (NLH) is presently operating a full-scale test site to monitor wind and ice loads on a nonenergized test transmission line. A data acquisition program written in C, and a data analysis and presentation program in MATLAB are being used to obtain and analyze the field data. This paper discusses these programs, as they relate to the wind and ice load study.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Proceedings of Canadian Conference on Electrical and Computer Engineering

    Publication Year: 1994
    Request permission for commercial reuse | PDF file iconPDF (90 KB)
    Freely Available from IEEE
  • High frequency characterization of CPW discontinuities

    Publication Year: 1994, Page(s):677 - 680 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (271 KB)

    A simplified method has been established to study the dynamic characterization of the two CPW discontinuities (open-end and short-end stub). Analytical formulas that are easy to use in CAD are proposed to calculate the inductors and capacitors of these models. The results are compared with measurements performed in the frequency range 1-30 GHz.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance of a multicast switch design under video load

    Publication Year: 1994, Page(s):531 - 534 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    This paper presents a design and performance evaluation of a multicast asynchronous transfer mode (ATM) switch in the presence of video traffic. The design allows sorting of packets which lose contention for an output port, and also allows priority of video traffic within the switch. The video traffic model used is for video teleconferencing and is developed from the autoregressive model of variab... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Frame spreading and a modified priority scheme for VBR MPEG video transmission in ATM networks

    Publication Year: 1994, Page(s):526 - 530 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper presents the study of an efficient transmission mechanism, using frame spreading, for variable bit rate MPEG video sources, through an ATM multiplex such as a cable head-end. A priority scheme is implemented in a software MPEG encoder, that produces similar traffic in both partitions, (i.e., the high and low priority partitions) for all three frame types, (intra, predicted and interpola... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance analysis of queueing models for multicast ATM switch architectures

    Publication Year: 1994, Page(s):308 - 311 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A copy network followed by a point-to-point switching network is a design approach that has been traditionally used for multicast switch architectures. One of the inherent problems in this design is the overflow which occurs when the total number of copy requests exceeds the network size. A natural solution is to store the blocked packets in a buffer. This paper investigates the performance of the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Copper access for switched video services

    Publication Year: 1994, Page(s):522 - 525 vol.2
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    This paper discusses the use of existing copper facilities to provide switched video services to residential customers. The goal is to begin offering NTSC video and multimedia services in a cost effective manner and to facilitate a practical transition to a fiber optic access network. Our work shows that existing copper distribution facilities can support initial low-penetration video demand for t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Priority analysis of a shared-buffer ATM switch with imbalanced bursty traffic

    Publication Year: 1994, Page(s):304 - 307 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    In this paper, we apply an aggregation method to analyze a shared-buffer ATM switch with priorities with two traffic classes. Each input port of the switch is assumed to be bursty and is modeled by an interrupted Bernoulli process. Both traffic classes share a common buffer of size M cells. High priority cells are served before low-priority cells. As an example, the analysis shows that a 4×4... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of X-band VCO for marine radar product

    Publication Year: 1994, Page(s):449 - 452 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    The authors explain the design approach of a VCO using linear simulation. The design method uses measured S-parameters for the active device of the oscillator and then, employs computer simulation to optimize the oscillator circuit to satisfy the oscillation conditions. The oscillator was fabricated using a GaAs-FET and Si abrupt junction varactor diode on Duroid substrate. The tested prototype ac... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Range image compression using the fan algorithm

    Publication Year: 1994, Page(s):517 - 521 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Range images, which are a representation of the surface of a 3-D object, are gaining popularity in many applications including CAD/CAM, multimedia and virtual reality. There is, thus, a need for compression of these 3-D images. Current standards, such as JPEG, are not appropriate for such images, due to their very nature. This has led us to develop a new compression method for range images. It app... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Neural network based signal prediction and parameter estimation for underwater layered media systems identification

    Publication Year: 1994, Page(s):777 - 780 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A method for underwater layered media (UWLM) modeling accounting for attenuation effects is proposed. A simple nonlinear structure and an algorithm for implementing and simulating the model based on the behavior of the media is designed. The assumption of suitable parameters in the modeling permits us to design a more accurate model. A model that responds to the acoustical input is employed to tes... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Identification of high speed targets facing the radar according to their length and signature

    Publication Year: 1994, Page(s):417 - 420 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The range resolution of a radar is limited by the duration of the emitted pulses. For short targets the different reflectors are closely spaced and their echoes overlap, making them indistinguishable at the receiver. An algorithm based on the MUSIC algorithm is used to improve the radar's range resolution and thereafter making it possible to identify the target according to its length and radar si... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Order N object moment generation

    Publication Year: 1994, Page(s):469 - 472 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    This paper proposes a method to compute n-th order moments of objects in a binary image. The traditional method is order N2. The method consists of an edge following routine followed by a second recursive moment generation routine which operates on the edge information. The speedup was determined to be on the order of 3 to 6 times for a 256 by 256 pixel image View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Simulation of a digital lightwave communication link using a semi-analytical scheme

    Publication Year: 1994, Page(s):300 - 303 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The purpose of this study is to efficiently evaluate the BER performance of a single mode, intensity modulated/direct detected lightwave communication link with fiber dispersion compensation. Expensive equipment and considerable resources can be involved in experimental testing of optical communication systems. However, performance evaluation of digital lightwave links by simulation is flexible an... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Underwater localization using an omnidirectional sensor system

    Publication Year: 1994, Page(s):445 - 448 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    This paper investigates the accuracy of locating an underwater acoustic source using the broadband information collected at arbitrarily positioned, submerged, omnidirectional hydrophones. An optimally weighted least square error estimator is used for the localization and the Euclidean variance is used as the measure of performance. Performance comparisons are made between two specific systems: one... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A solar battery charger with improved energy utilization

    Publication Year: 1994, Page(s):105 - 108 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    It is desirable to extract maximum power from solar cells under various sunlight insolation conditions, for battery charging applications. An economical solar battery charger and its control principle are proposed and implemented by the authors. The operating principles, effects of circuit parameters and comparative test results are presented in the paper. The test results show that the proposed c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fractal coding of color images

    Publication Year: 1994, Page(s):513 - 516 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Recently, fractal based compression techniques which provide a large compression ratio for monochrome images have been reported in the literature. Fractal coding is based on the fractal theory of iterated transformations. This paper discusses fractal geometry as applied to color image coding. In the case of color images there exists correlations among the color components and hence greater compres... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Radar imaging of a target with the aid of the spot-SAR method with signal processing

    Publication Year: 1994, Page(s):775 - 776 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    Using an array focused or not (on the center of a rotating object), the aim of this project consists of adapting a parametric superresolutive technique for radar imaging using also synthetic aperture techniques. The desired image is the two-dimensional distribution of the scattering points of the object View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Matching procedure for remote sensing images

    Publication Year: 1994, Page(s):413 - 416 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    In remote sensing applications there is a need for matching the two images. This paper describes a general purpose algorithm for the automated registration and matching of remote sensing images. The method is based on a modified version of the iterative closest point (ICP) algorithm. The algorithm requires a procedure to find the closest point for geometric entity of a given point then it builds a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Distribution of current density in ACSR conductors

    Publication Year: 1994, Page(s):165 - 168 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The distribution of the current density in steel-cored conductors is nonuniform, due to the transformer effect. This effect is most pronounced in conductors with an odd number of layers of nonferrous wires, and depends on the magnetic properties of the ferromagnetic core and the geometry of the conductor. The paper examines the redistribution of current within a 54/19 (Grackle) ACSR conductor, and... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of SVCs and PSSs to mitigate inter-area oscillations in longitudinal systems

    Publication Year: 1994, Page(s):9 - 13 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    This paper presents some early results of a research project on the application of static VAr compensators (SVCs) and power system stabilizers (PSSs) to mitigate inter-area oscillations in the Mexican interconnected power system. Eigenvalue-based techniques are used at this first phase to determine the nature of power system oscillations and to provide information on the influence of controllers o... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Repairing false starts in the automatic recognition of spontaneous speech

    Publication Year: 1994, Page(s):465 - 468 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A primary difference between spontaneous speech and read speech concerns the use of false starts, where a speaker interrupts the flow of speech to restart an utterance. The acoustic and distributional aspects of such restarts in a widely-used speech database are examined. Identifying the nature and extent of the restart in such cases could improve the performance of an automatic speech recognizer,... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Joint sequence detection and phase estimation using the EM algorithm

    Publication Year: 1994, Page(s):296 - 299 vol.1
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    In burst communications, each burst of data arrives with a different, unknown carrier phase. Traditional methods of data detection in the presence of unknown phase are inappropriate here. Recently, several authors have proposed a variety of methods to detect data bursts with an unknown phase. One very successful method is based on the EM algorithm, an iterative statistical method. In our paper, we... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance enhancement of adaptive phased arrays for wireless indoor communication systems

    Publication Year: 1994, Page(s):238 - 241 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    This paper addresses the problem of communicating over a confined area that is characterized by multipath-fading as wireless indoor communication. To combat the effects of multipath-fading, we propose a new adaptive phased array antenna which is based on a non-linear method. An “on-off” adaptive algorithm to adjust a phase angle is developed and applied to an antenna system in order to... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power line data communication using timed transmission

    Publication Year: 1994, Page(s):280 - 283 vol.1
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    This paper proposes a timed transmission method for data communication on in-building power conductors. The advantage of using such a system is that the network is easily re-configured and can be accessed through any wall socket without additional wiring cost to the user. Unfortunately, the AC power conductors present a hostile transmission environment for data signals. This is due to high noise l... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.