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Electrical and Computer Engineering, 1998. IEEE Canadian Conference on

Date 25-28 May 1998

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Displaying Results 1 - 25 of 120
  • University And Industry - Partners In Success [front matter]

    Page(s): i - ix
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    Freely Available from IEEE
  • Index [of authors]

    Page(s): 1 - 5
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    Freely Available from IEEE
  • Architecture of a low cost spread spectrum wireless transceiver

    Page(s): 613 - 616 vol.2
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    The paper presents the RF and IF architecture of a wireless transceiver. To simplify the modulation and demodulation processes a DPSK modulation scheme has been chosen. The demodulation is done from the IF frequency of 280 MHz. The paper presents the signal propagation analysis as well as the hardware implementations of several key components. Among these, we note the unbalanced to balanced circuitry, phase locked loops, IF filtering and grounding/supply network. Experimental results are also discussed View full abstract»

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  • On using the solid state breaker in distribution systems

    Page(s): 693 - 696 vol.2
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    The paper demonstrates, through the use of electromagnetic transient simulations, the key issues in the application of solid state devices for fault control and protection in the distribution systems. Three types of topologies have been considered, viz. a bus tie breaker, a transfer switch, a fault current limiter, but only two have been discussed in detail; the bus tie breaker is taken to be a special case of the fault current limiter. The control scheme for each topology has been designed and studied, with emphasis on the detection schemes and the responses to various system and load parameters. All simulations have been carried out using the PSCAD/EMTDC program View full abstract»

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  • Implementing process improvement in software development

    Page(s): 505 - 508 vol.2
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    Process improvements in a software development environment require clear goals and an understanding of the current culture. The goals for process improvement may be set based on the observed problems with the development process, the product itself or according to market requirements (e.g. ISO certification requirement, CMM maturity level desired). Typical problems with software development projects usually lie in the areas of cost overruns, missed schedules and less-than-desired quality. To be successful the goals of the program must directly support the organization's business goals and fit with the culture of the development community. The successful approach is to focus on those areas which, when improved, will result in the greatest impact within the shortest time frame. These areas are determined based on an in-depth knowledge of the customer, the customer's needs determined through user needs analysis and the organization's goals View full abstract»

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  • A digital wattmeter employing a trapezoidal compensation approach

    Page(s): 838 - 841 vol.2
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    An improved accuracy digital wattmeter for distorted signals is implemented using a Motorola 68000 microprocessor with associated peripherals. The power computation algorithm utilizes a trapezoidal compensation method, described in the literature, to compensate for nonsynchronous sampling effects which can occur with a fired sampling interval. Unlike the software interpolation used in the literature, a simple hardware approach is used to determine the fraction of a sampling interval which will result in synchronous sampling. The trapezoidal rule is applied to the product of simultaneously sampled voltage and current signals over an integral number of cycles of the signal fundamental, taking into account the trapezoidal compensation. The result is displayed on an LCD unit. The unit enables 2 voltage-current pairs to be sampled simultaneously and a keypad is used for selecting the various display formats and channel selections View full abstract»

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  • Video compression through fractal block coding

    Page(s): 465 - 467 vol.2
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    This report presents a technique for encoding motion video using a modified fractal block coding algorithm. The encoding algorithm is used as the main component in a video transmission system. The algorithm performs a reduced search through the domain block pool. To enhance performance, the domain block pool is partitioned and a cache is used, where an 8% improvement is shown. Through these techniques, the transmission process can work at speeds of approximately 4 fps View full abstract»

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  • Modeling and dynamic analysis of a fast response three phase PWM voltage source rectifier

    Page(s): 677 - 680 vol.2
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    This paper presents dynamic analysis of a three-phase PWM voltage source rectifier based AC/DC power supply system using a feedforward/feedback control algorithm proposed by the authors previously. A small signal model of the power supply in s-domain is derived. This model is used in obtaining transfer functions describing the response of the DC output voltage following load, line and reference changes. The dynamic analysis is verified by transfer function simulation using MATLAB and time domain simulation of the power supply system View full abstract»

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  • A study of turbo codes for multilevel modulations in Gaussian and mobile channels

    Page(s): 641 - 644 vol.2
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    In this paper, we present simulation results for a system combining turbo codes and multilevel modulation. This scheme is shown to be an excellent solution when it comes to transmission over bandlimited channels. Its performance in mobile radio channels can be improved using OFDM View full abstract»

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  • Representing power distribution systems using objects and patterns

    Page(s): 846 - 849 vol.2
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    Power distribution systems provide the final link between a utility and its customers. System components, and the functions that provide the analysis of those systems, can be represented by software objects. Design patterns can then be used to simplify the design of software for analysis and control of power distribution systems View full abstract»

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  • Distributed advanced search techniques for circuit partitioning

    Page(s): 553 - 556 vol.2
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    Parallel and distributed computing systems offer the promise of a quantum leap in the computing power that can be brought to bear on many important problems. The potential for distributed processing exists whenever there are several computers interconnected in some fashion so that a program or procedure running on one machine can transfer control to a procedure running on another. In such an environment we wish to assign optimally the modules of a program to specific processors. The main objective in optimizing is twofold, minimizing the running time of the program and improving the efficiency of the algorithm. Our main task in this work is to develop an environment that allows easy parallelization of the existing sequential algorithms, in which the potential parallelism fits easily into the sequential algorithm. This paper discusses techniques to parallelize advanced search heuristics (Areibi and Vannelli, 1994) used to solve the circuit partitioning problem View full abstract»

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  • Springfield: a real-time parallel simulation of mobile telecommunications

    Page(s): 501 - 504 vol.2
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    This paper describes project Springfield, a real-time distributed simulation of a mobile telecommunications network. Springfield permits real-time viewing and modification of the simulation and its parameters, which is ideal for capacity planning and performance modeling. An object-oriented, distributed simulator was implemented in Java and speedups of up to three times were obtained View full abstract»

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  • An on-line real-time relative dissipation factor monitoring system

    Page(s): 493 - 496 vol.2
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    A prototype on-line, real-time relative dissipation factor system is described. Selected data recorded during a long-term, more than a year, experiment, conducted in a high-voltage laboratory, is presented. Data taken on “good” current transformers, data indicating the resolution of the system, and data taken during the actual failure of a current transformer are presented. The data presented illustrate the potential for on-line, real-time relative dissipation factor monitoring of fluid-paper insulation systems to help utilities maximize their use of capital intensive assets and reduce the risk of disruptive failures View full abstract»

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  • A comparison of load flow analysis using DistFlow, Gauss-Seidel, and optimal load flow algorithms

    Page(s): 850 - 853 vol.2
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    The state of a power system and the methods of calculating this state are extremely important in evaluating the operation of the power system, the control of this system, and the determination of future expansion for the power system. The state of the power system is determined through load flow analysis that calculates the power flowing in the lines of the system. There are several different methods to determine the load flow of a given system. For the purposes of this paper, only three methods of load flow algorithms are evaluated: Gauss-Seidel, optimal load flow, and the DistFlow method View full abstract»

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  • High speed linear CCD sensors with pinned photodiode photosites

    Page(s): 649 - 652 vol.2
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    In this work we describe two families of linear image sensors which incorporate pinned photodiode (PPD) photosites. In a PPD photosite the n+ region of the conventional photodiode is replaced by an n region and a shallow highly doped p region. The high quantum efficiencies associated with conventional photodiodes are maintained while allowing for large reductions in image lag and fixed pattern noise which are associated with conventional photodiodes View full abstract»

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  • Nonlinear speed control of large industrial DC motor drives with an energy efficiency enhancement loop

    Page(s): 589 - 592 vol.2
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    The paper presents a novel dynamic speed reference trajectory tracking controller using an error driven self-adjustable, self-regulating nonlinear control block. The speed controller has two time-decoupled control/regulation loops namely: (i) the speed reference trajectory tracking loop; and (ii) a supplementary minimum power input dynamic tracking-search loop to ensure higher utilization efficiency for inrush type, cyclical and dynamic loads. The paper presents Matlab digital simulation results of a DC motor drive system with the switching inherent delay and other drive/control nonlinearities taken into consideration. The self adjusting hyper error driven nonlinear control block ensures good speed reference tracking, minimum inrush current and excursions as well as online energy conservation and electrical power energy savings for large industrial DC motor drives in the range (100 kW-1000 kW) View full abstract»

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  • University NSERC research and technology transfer-the DALSA corporation case

    Page(s): 932 - 939 vol.2
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    The author starts with the university NSERC research he carried out in the 1970s and 1980s in the Electrical and Computer Engineering Department of the University of Waterloo. The NSERC and industrially funded research encompassed both fundamental and applied contributions in the field of semiconductor devices and integrated circuits. The author then describes the process by which he created the DALSA company, the process by which funding was achieved in November 1984, and the capitalization of this company at its early difficult stages of development. How the company went through the entrepreneurial, experimental and formative stages are also described. He deals with the process by which he transferred the technology from the publications and his own knowledge to the young company so that it proliferated and was used for application specific projects and later on for products. He also includes the history of DALSA. Finally, he deals with the present research and development efforts and the international leadership which the company commands in CCD image sensor and electronic cameras technology View full abstract»

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  • Fractal segmentation of signal from noise for radio transmitter fingerprinting

    Page(s): 561 - 564 vol.2
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    This paper presents a study of segmentation between channel noise and turn-on transient for radio transmitter fingerprinting. The segmentation is based on a multifractal measure, which is called variance fractal dimension trajectory. Previous studies have shown that this multifractal measure is effective in nonstationary signal characterization. We employ two techniques for the variance fractal dimension implementation and evaluate them in terms of noise segmentation. An optimal window size for the fingerprinting is presented. We also present the Renyi dimension trajectory based on generalized entropy as an alternative of the variance fractal dimension measure for noise segmentation View full abstract»

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  • VLSI implementation of a high speed second order sigma-delta modulator with high-performance integrators

    Page(s): 545 - 548 vol.2
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    Oversampling analog-to-digital converters based on second-order sigma-delta (ΣΔ) modulation are attractive for VLSI implementation because they are tolerant of circuit nonidealities and component mismatch. This paper compares a high speed second-order ΣΔ modulator to several alternative modulator architectures in the context of large bandwidth signal acquisition. Design details are presented for 0.5-μm CMOS implementation. The experimental modulator is a fully differential circuit that operates from a ±3 V power supply and does not require the use of precision sample-and-hold circuitry. With an input bandwidth of 20 MHz and a clock rate of 160 MHz, the modulator reaches 26 dB signal-to-quantization noise (power) ratio (SQNR) using spectra simulation. All the elements of this design have implemented using switched-capacitor circuit techniques. Two identical noninverting parasitics-insensitive lossless switch capacitor sharing integrators have been used in order to achieve a large bandwidth and a linear integration View full abstract»

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  • A smart PWM-modulated power filter for single phase motorized loads

    Page(s): 778 - 781 vol.2
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    The paper presents a simple PWM power filter for single phase motorized inrush-current loads such as air conditioning, ventilation and water pumping. The paper presents the simulation results and prototype laboratory testing and validation of the smart modulated passive filter using a dynamic RMS-current tracking controller. The smart filter/energy miser ensures supply power quality enhancement, less source current/load voltage waveform modulation, as well as enhanced electric energy efficiency for cyclical, inrush current nonlinear motorized loads. The PWM switching scheme establishes a dynamic on-line varying duty cycle ratio α that modulates the apparent smart filter impedance to provide an effective compensating filter current level to cope with load current waveform distortion View full abstract»

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  • FPGA implementation of the guided scrambling line coding technique

    Page(s): 742 - 745 vol.2
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    The guided scrambling (GS) line coding technique was introduced by Fair, Grover, Krzymien, and MacDonald (1991) as a novel mechanism to ensure that binary transmitted sequences exhibit desirable line code characteristics. We describe a field programmable gate array (FPGA) implementation of GS. The system accommodates code words of up to 32 bits in length, with one or two augmenting bits per word. It permits specification of any scrambling polynomial with degree less than or equal to 32, and through the choice of two code word selection mechanisms, can be optimized for either high transition density or minimization of low frequency content. The system is used to verify theoretical expectations for the power spectral density of the encoded stream for various scrambling parameters, and to confirm expected trends in the statistics of encoded sequences for code configurations whose theoretical analysis is impractical View full abstract»

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  • FACTS controllers and the deregulated electric utility environment

    Page(s): 597 - 600 vol.2
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    The push towards deregulation in the electric utility industry is forcing a revaluation of the way transmission systems are operated. Reliance on the natural flow of current cannot meet the new requirements imposed by deregulation. One method to dictate the power flows is the increased reliance of Flexible AC Transmission Systems (FACTS). This paper presents some of the new directions being investigated to adapt and exploit the potential of power electronic converters to increase the flexibility and reliability of modern power systems View full abstract»

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  • A low-loss 2D-C-L-R resonant snubber for single-switch soft-switching boost DC/DC converters

    Page(s): 858 - 861 vol.2
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    A novel 2D-C-L-R resonant snubber for single-switch soft-switching boost DC/DC converters is introduced. This snubber ensures a zero current turn-on and zero-voltage turn-off of the transistor. The turn-off of the diode is soft. The principles of operation and simulation results are presented View full abstract»

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  • Physical optics simulation of electrically small substrate lens antennas

    Page(s): 814 - 817 vol.2
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    The radiation patterns of electrically small substrate lenses fed by slot antennas are computed using a hybrid physical optics technique. The method is also used to predict the radial field components at the lens-to-air boundary of electrically small lenses View full abstract»

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  • Distributed query optimization using reduction filters

    Page(s): 707 - 710 vol.2
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    The optimization of general queries in a distributed database management system is an important research topic. The difficulty is to select the database operations which will process the query and minimize costs. Traditional solutions include the use of heuristic strategies based on semijoin or join operations. We present an approach for general queries which uses reduction filters, which are based on Bloom filters, to minimize data transfers and reduce local processing costs. We discuss related work and present our algorithm-illustrating it with a simple example. We end with a brief discussion of current and future work View full abstract»

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