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Electrical and Computer Engineering, 1997. Engineering Innovation: Voyage of Discovery. IEEE 1997 Canadian Conference on

Date 25-28 May 1997

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  • CCECE '97. Canadian Conference on Electrical and Computer Engineering. Engineering Innovation: Voyage of Discovery. Conference Proceedings

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  • Authors index

    Page(s): 1 - 6
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  • FPGA reconfigurability in the presence of logic and I/O faults

    Page(s): 740 - 743 vol.2
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    The SRAM FPGA's reconfigurability is investigated with a view to addressing the problems of reparability through the utilization of a device's unused logic and routing resources. This is done by remapping the design such that the faulty logic is bypassed. This paper addresses the issue of mapping designs onto FPGAs with single and multiple logic and I/O block faults subject to the constraint that the faults are correctly identified, localized, and excluded from the pool of available logic and I/O cells. The viability of the proposed approach depends on the maintenance, within acceptable performance parameters, of the reconfigured circuit's throughput and interface characteristics. The reconfigurability of representative complex butterfly circuit in the presence of single and multiple faults is considered and relevant simulation results based on the ORCA 2C40 device are presented View full abstract»

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  • Adaptive control for pole-top capacitor banks

    Page(s): 752 - 756 vol.2
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    This paper investigates the timely operation of switched pole-top capacitor banks on distribution circuits and compares an innovative approach of capacitor-bank switching to those used by many conventional controls now in operation. This paper also reports on the actual field operation of an adaptive capacitor control being incorporated on distribution systems in North America. This control's operation is independent of fixed relationships between circuit VAr requirements and other system quantities to the extent that no settings are required by the user View full abstract»

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  • Evolving optical fiber designs

    Page(s): 888 - 891 vol.2
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    The introduction of optical amplifiers early this decade, combined with the advancement of transmitter and multiplexing technology, has allowed the bundling of many transmission channels onto a single fiber. This has occurred simultaneously with an increasing demand for information carrying capacity driven by everything from deregulation to an explosion in Internet use. To meet these challenges, fiber manufacturers are evolving new fiber designs to facilitate changing transmission techniques. This paper discusses the driving forces behind new fiber designs, and examine some of the advances that have been made, including dispersion compensating fiber, non-zero dispersion shifted fiber, and large effective area fiber View full abstract»

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  • Automatic extraction of contour lines and feature points from profile images

    Page(s): 831 - 834 vol.2
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    The paper proposes a new extraction algorithm for contour lines and feature points from profile images for automatic personal identification. First the authors input a side view of a human head within a dark background under uniform lighting conditions by a CCD camera, then transform the input to a color difference signal image. After enhancing edges of the image using Sobel operators they binarize the luminance level of each pixel and portray a black profile in a white background. Next they differentiate the black profile, binarize the differentiated results, and depict a contour line using a thinning operator. Finally they encode the extracted contour line using Freeman's chain code and, using the encoded data, calculate the digital curvature in concave sections of the contour line and determine the concave feature points. Next they draw straight lines connecting the adjacent feature points and specify the convex feature points on the contour line which are farthest from the straight lines. They can obtain feature points of the profile automatically and reliably View full abstract»

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  • Implementation issues for half-bridge and full-bridge active filters in single phase applications

    Page(s): 544 - 547 vol.2
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    Active filters are becoming a more and more effective means of eliminating harmonic currents generated by nonlinear loads in distribution systems. In single phase applications two topologies are available: (a) half-bridge, and (b) full-bridge. This paper focuses on the relative merits of both topologies. The performance of each topology is investigated. A detailed analysis is included to highlight their inherent problems and define criteria for the selection of appropriate topology. Moreover, the design of LC filtering stages is investigated in depth. Key experimental results are provided to validate the theoretical concepts View full abstract»

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  • Digital recording system for high-resolution radar

    Page(s): 843 - 846 vol.2
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    This paper describes some of the issues that arise in the design of a radar recording system. Typically such systems require the simultaneous capture and archival of large amounts of data from multiple sources and media. The data must be captured, combined and archived together in a way that makes accurate reproduction possible. The proposed design can be implemented in Windows/NT using readily available technology. The success of the implementation depends on the integration of standard hardware to the analogue sources using custom interfaces. The software development effort requires the creation of graphical user interfaces, client/server architectures, and real-time kernel-mode drivers View full abstract»

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  • Asynchronous design in dynamic CMOS

    Page(s): 528 - 531 vol.2
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    The design for dynamic CMOS cells that can be used as building blocks in an asynchronous pipeline are discussed in this paper. The proposed circuit elements are variations on TSPC logic using Sutherland's micropipeline structure combined with dual rail logic to detect operation completion. The resulting cell occupies more area than a TSPC cell, but has higher functionality because of the built-in data flow control mechanisms provided by the handshake signaling of the micropipeline structure View full abstract»

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  • The public switched telephone network and the Internet meet

    Page(s): 892 - 895 vol.2
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    The phenomenal growth of the Internet has provided both a challenge and an opportunity to the public switched telephone network (PSTN). Modem traffic has increased the load on the switched network forcing an upgrade to the network if the accustomed grade of service is be maintained. Telephone companies are also losing revenue to Internet services, further compounding their problems. One solution is to shift Internet traffic away from the voice switched network and to explore new revenue generating opportunities beyond traditional long distance and local access services View full abstract»

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  • An edge-enhanced segmentation method for SAR images

    Page(s): 599 - 602 vol.2
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    A major problem in processing synthetic aperture radar (SAR) images is the presence of speckle noise which is multiplicative in the sense that the noise level increases with the magnitude of radar backscattering. Past researchers have proposed filtering schemes for removing speckle based on local statistics. However, these usually do not use edge information in their analysis. In this paper, an edge-enhanced local mean and median filter is proposed to smooth SAR speckle noise while preserving edges. Based on the iterative application of this filter, an unsupervised segmentation scheme is provided to divide a SAR image into homogeneous regions with respect to gray level intensity. The simplicity and efficiency of this scheme are demonstrated by application to airborne SAR images View full abstract»

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  • Efficient pre-processing algorithms for an FPGA based in-camera video-stream processing system for industry inspection

    Page(s): 835 - 838 vol.2
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    The authors describe a prototype system for developing real-time video-rate data stream processing algorithms for automated machine vision systems. This system benefits from programmability of FPGA and enables one to experiment different algorithms on site. The paper describes different parts of the system in detail and compares the different algorithms used in pre-processing step in terms of their complexity, efficiency and the number of CLBs used for FPGA implementation View full abstract»

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  • A VLSI architecture for image reconstruction

    Page(s): 540 - 543 vol.2
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    In this paper we propose a VLSI architecture for an image reconstructor. The architecture implements in hardware the Two Dimensional Normalized Sampled Finite Sinc Reconstructor (NSFSR 2-D) reconstruction technique. Based on validation results, we conclude the proposed architecture implements correctly the NSFSR 2-D and is optimized in performance when compared with a software-based implementation View full abstract»

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  • Performance evaluation of a multiprocessor SCP for intelligent network services

    Page(s): 804 - 807 vol.2
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    In this paper we give a general description of the intelligent network (IN) and study a service control point (SCP) architecture in which multiple call processors participate to IN call/service processing. The SCP is the core physical entity of the IN architecture and is dedicated to process IN calls under stringent real-time requirements. We show, by means of simulations, that with the increasing complexity and amount of IN services stored in local disk-based databases, a variety of parameters and resources result in poor performance. The complexity of a service is described as the amount of service processing logic data required to complete an IN call. We also present some possible solutions in order to alleviate the poor performance when local disk-based databases are used View full abstract»

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  • Modelling of switched reluctance motors

    Page(s): 866 - 869 vol.2
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    Switched reluctance motors (SRM) provide an alternative for low power automobile drives. However, the modeling and design of SRMs are not as mature as other conventional electric machines. This presents an opportunity to combine the generalized electrical machine theory and the finite element analysis in establishing a convenient and accurate model. This paper reports a modeling technique based on this combination. The detailed modeling process, computer simulation and test results are demonstrated in the paper. The modeling and simulation techniques have been applied to the development of the MOSFET converter and its control strategy for a 250 W, 12.8 V SRM for automobiles View full abstract»

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  • Single bridging fault diagnosis for CMOS circuits

    Page(s): 732 - 735 vol.2
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    This paper presents a new algorithm for diagnosing gate level bridging faults in CMOS circuits. The algorithm employs a single fault assumption, and produces a significantly higher diagnostic resolution than that provided by previous algorithms. Extensive computer simulations are performed to illustrate the merits and feasibility of the new algorithm using the ISCAS85 benchmark circuits View full abstract»

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  • Link design and capacity comparison of burst transmission methods for ATM cells and AAL PDUs over broadband satellites

    Page(s): 676 - 679 vol.2
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    This paper evaluates coding methods to meet the quality of service requirements of various services to be offered over broadband satellite networks, transported by ATM cells or AAL PDUs. A partially-concatenated coding method is proposed for ATM cell transport to optimize bandwidth. Analyses and comparisons of channel capacities for services under different alternatives are presented View full abstract»

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  • Automatically localizing discontinuities during surface reconstruction

    Page(s): 603 - 606 vol.2
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    This paper describes an extension to a class of surface reconstruction algorithms based on the minimization of variation of curvature, the so-called curvature consistency framework. It deals explicitly with the problem of localizing surface discontinuities, which was one of the shortcomings of the original work. Inter-pixel interactions during the variational relaxation based smoothing process can be construed as a multiple measurement fusion problem. Using this formulation, based on “noise” properties of pixels, weights are assigned to each pixel contributing to a local surface estimate. Since discontinuities are included in this noise model, it becomes possible to obtain a smooth reconstruction of the surface from noisy data, while localizing the discontinuities View full abstract»

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  • A fuzzy expert system for optimizing pipeline operation

    Page(s): 777 - 780 vol.2
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    The development of a fuzzy expert system is proposed for optimizing natural gas pipeline operation. This expert system employs fuzzy sets and fuzzy logic to manage the uncertainties and imprecision in the pipeline operations (caused by humans) as well as in the system. Fuzzy linear regression analysis is used to extract some of the information to develop the knowledge base of the expert system. Other information used to develop the knowledge base is acquired from both human experts and a simulation of the natural gas pipeline system View full abstract»

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  • Multiple source intersystem interference between land mobile systems

    Page(s): 816 - 818 vol.2
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    This paper presents an analytical model to compute the global interference power, at a receiver, generated by a number of surrounding transmitters. The model effectively assesses the aggregated interference from transmitters into one receiver, taking into consideration distance, power and antenna characteristics. The discussion on this model is followed by an example that shows its software implementation into a program that uses data from the Canadian frequency licensing database View full abstract»

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  • A shipboard system for remote real-time data collection and monitoring

    Page(s): 847 - 849 vol.2
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    This paper describes a system for collecting data from a ship utilising the MSAT mobile satellite communications network. The system was extensively tested during the period from January-March 1997 on board a Canadian Coast Guard vessel. The results of these tests and future enhancements to the system are presented in this paper View full abstract»

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  • Analog circuit design using amorphous silicon thin film transistors

    Page(s): 633 - 636 vol.2
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    Amorphous silicon thin film transistors (TFTs) can be important circuit elements in large area imaging sensors because of their advantageous material and optical properties. These TFTs bring with them a gate-bias-induced threshold voltage (VT) shift, which is a highly undesirable effect for analog circuits. This paper addresses two techniques for reducing the effect of VT shift in TFT circuit applications. Internal compensation for VT shift was achieved to a first order by optimal bias conditions designed in the circuit. In a second circuit negative feedback was used to make amplifier circuits less sensitive to changes in VT. Results are presented for both measured circuits and for simulations using the ASIA-1 amorphous silicon TFT model on the AIM Spice simulator. Experiments demonstrate that a differential amplifier with ~20 dB of gain, varies less than 2% change when the VT of the TFTs change by up to 300%. Alternatively, a three-stage amplifier, with an overall gain of 13 dB, displays only a 5% change of overall gain when employing negative feedback View full abstract»

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  • Call and burst blocking in a broadband network with on and off sources

    Page(s): 812 - 815 vol.2
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    This paper considers call and burst blocking in a broadband network with on and off sources. We assume that during their off periods calls release their bandwidths which may be assigned to the other on calls. A new call is accepted to the system only if the burst blocking probabilities remain acceptable. It is shown that the product-form solution still applies and a multidimensional recursion has been derived to calculate the joint link occupancy distribution View full abstract»

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  • An investigation of the antenna and the propagation path of Marconi's transatlantic experiment

    Page(s): 704 - 707 vol.2
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    Long distance radio propagation history started with Marconi's transatlantic experiment on the 12th of December 1901. Although Marconi's experiment has been analysed by many researchers, the focus has only been on the circuit theory part. But here in this work we have studied it from the antenna and the ionospheric propagation points of view. Marconi claimed that he had used signals with a frequency of 0.166 MHz. Using his antenna design and ionospheric conditions prevailing at that time the present work proves that signals with frequencies of 9.375 MHz and 12.5 MHz had much higher possibility of transatlantic transmission rather than his much reported frequency. We have also shown that if the experiment was done in summer the possibilities of success would have been even less View full abstract»

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