Scheduled System Maintenance on May 29th, 2015:
IEEE Xplore will be upgraded between 11:00 AM and 10:00 PM EDT. During this time there may be intermittent impact on performance. For technical support, please contact us at onlinesupport@ieee.org. We apologize for any inconvenience.
By Topic

WESCANEX 95. Communications, Power, and Computing. Conference Proceedings., IEEE

Date 15-16 May 1995

Go

Filter Results

Displaying Results 1 - 25 of 47
  • IEEE WESCANEX 95. Communications, Power, and Computing. Conference Proceedings

    Publication Year: 1995
    Save to Project icon | Request Permissions | PDF file iconPDF (758 KB)  
    Freely Available from IEEE
  • List of keywords

    Publication Year: 1995
    Save to Project icon | Request Permissions | PDF file iconPDF (222 KB)  
    Freely Available from IEEE
  • List of authors

    Publication Year: 1995
    Save to Project icon | Request Permissions | PDF file iconPDF (113 KB)  
    Freely Available from IEEE
  • Birdsong recognition with DSP and neural networks

    Publication Year: 1995 , Page(s): 409 - 414 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    Analysis of speech often begins with study of the vocal tract that created it. Bird vocalizations and human speech are generated by similar processes. This suggests that LPC coefficients extracted from birdsong samples could retain enough information to permit identification of species. In this paper we train a back-propagation neural network to recognize bird songs. We generated test and training data sets using 133 songs from six common bird species. Initially, identification performance was good for some species, and poor for others. We attributed this to a lack of temporal context information in the data. By changing the type of spectral information presented to the network, we were able to improve performance. We conclude that a neural network combined with digital preprocessing can be used to identify a bird by its song View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of DC capacitance of a STATCON on the dynamic performance at a weak HVDC terminal

    Publication Year: 1995 , Page(s): 289 - 293 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    This paper investigates the effect of the DC capacitance of an advanced static VAr compensator or STATCON on the dynamic performance at a high voltage direct current (HVDC) inverter terminal where the AC system has a very low short circuit ratio (SCR). The simulation results show that the STATCON behaves almost equally well under severe AC disturbance while the DC capacitance of the inverter is varied over a wide range. The studies also examine the operating characteristics of the STATCON corresponding to the low-order harmonic resonances as a function of the DC capacitor size. It can be concluded that the second harmonic of the AC system has little effect on the stable operation of the STATCON. In determining the DC capacitance size of the inverter, the low-order harmonic resonances are not a matter of concern View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Neural code-excited linear prediction for low power speech compression

    Publication Year: 1995 , Page(s): 415 - 420 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    In this paper, we discuss the use of artificial neural learning methods for low bit-rate speech compression, potentially in non-stationary environments. Unsupervised learning algorithms are particularly well-suited for vector quantization (VQ) which is used in many speech compression applications. We discuss two unsupervised learning algorithms: frequency-sensitive competitive learning and Kohonen's self-organizing maps which have both been investigated for learning the codebook vectors in an adaptive vector quantizer. In contrast with earlier work, we have employed these learning rules in VQ of the linear predictive coding (LPC) prediction residual. The performance of these unsupervised learning algorithms in speaker-dependent and speaker-independent speech compression are presented. Our results compare favourably with those of code-excited linear prediction (CELP) requiring reduced computational power with a tolerable reduction in speech quality. We also explore the effects of limited precision on classification and learning in competitive learning algorithms for low power VLSI implementations View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Steel scheduling optimization for IPSCO's rolling mill and reheat furnace

    Publication Year: 1995 , Page(s): 294 - 299 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (500 KB)  

    Energy savings and higher production rates are two important objectives that today's iron and steel industry is trying to achieve. One of the possible ways to reach these targets is through optimal production scheduling. In this paper, an iron and steel production scheduling problem is studied. An efficient algorithm based on a modified enumeration procedure is developed to solve the problem within acceptable computational time. The method is applied to generate steel production schedules in IPSCO. The method showed great potential savings over the existing scheduling method in IPSCO View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Survey of voiceband data signal compression

    Publication Year: 1995 , Page(s): 361 - 365 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    Today's public switched telephone networks are being upgraded to use digital transmission and switching. The main disadvantage of digital transmission is the higher bandwidth required. To alleviate this problem, much research has been devoted into the compression of digitized voice signals. However, such compression techniques tend to have adverse effects on non-voice signals such as modems and faxes. Only recently has the area of voiceband data signal compression been explored. This paper covers some of the highlights of these publications including DPCM, delta modulation, low delay code excited linear prediction, and vector quantisation View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Synthesizing testability features into a design with the Synopsys Test Compiler

    Publication Year: 1995 , Page(s): 462 - 467 vol.2
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (420 KB)  

    In this paper, we present a methodology for synthesizing testability features in a design described using Hardware Description Language (HDL) and the Synopsys Test Compiler tool. Because an HDL described design of an IC device can be automatically transformed into a gate-level implementation for a given technology with Synopsys Synthesis Tools, adding internal scan test circuitry or boundary scan test circuitry can be easily achieved with the Synopsys Test Compiler. We will discuss scan styles, test methodologies, test pattern generation, as well as the application and format of test patterns View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Evaluation of harmonic impedance presented by a thyristor controlled AC load

    Publication Year: 1995 , Page(s): 258 - 263 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    The growing use of thyristor controlled loads in AC distribution systems is a major cause of increased level of harmonics which have many other detrimental effects on power system operation. One aspect of interest to the electric utility is the harmonic impedance presented by the power converter/load to the distribution system. In this preliminary investigation, the harmonic impedance of a power converter/load as a function of the power converter delay angle is evaluated View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Evaluating interaction between high speed power system controllers

    Publication Year: 1995 , Page(s): 270 - 275 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    Control coordination of fast acting voltage devices is considered of great significance in the electric utility industry as the existing transmission systems are expected to operate at higher loadings. Coordination of the controls of static VAr compensators, DC transmission systems and power system stabilizers will maximize the loading capability of the network. The available study tools are identified along with how they might be applied to coordinate controls. A procedure for coordinating controls for electromechanical and electromagnetic interactions is presented. A “global gain margin” is defined View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of system imperfections on BER performance of CDMA receiver with multipath diversity combining

    Publication Year: 1995 , Page(s): 392 - 397 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (436 KB)  

    The bit error rate performance of a multipath combining type code division multiple access receiver with imperfections in power control, channel parameter estimation and spreading code phase estimation is analyzed. Imperfection in power control is taken into account by modeling the received signal power as a log normally distributed random variable. The estimate errors are modeled as zero mean Gaussian random variables. It is shown that the performance of such a receiver significantly degrades when variance of power control imperfection is above 0 dB, mean square error in channel parameter estimation is above 0.01 and standard deviation of the code phase error is above 0.1 View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Faraday effect based clamp-on magneto-optical current transducer for power systems

    Publication Year: 1995 , Page(s): 329 - 333 vol.2
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB)  

    A new type of Faraday effect based magneto-optical current transducer (MOCT) has been developed. This paper presents the theoretical background, engineering design, and test results of this clamp-on MOCT. The sensor consists of two separate clamp-on parts. This design avoids the need to break the current carrying circuit in order to have the conductor enclosed by the optical path while keeping the same measurement accuracy. A feedback scheme has been designed to stabilize the light source. The MOCT has two output stages, 1 kA, and 20 kA, so that it can provide current signals for both power system metering and relaying devices View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An algebraic construction method for cellular neural networks

    Publication Year: 1995 , Page(s): 427 - 431 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (276 KB)  

    An algebraic method for construction of a cellular neural network (CNN) is derived. Using this method, CNNs for connected component detection and the maze problem are given in detail. Because the transition of states is included in the algebraic equations during the construction of the network, the network arrives at a unique solution in either a synchronous or an asynchronous operation process, and the solution is stable. The cellular neural network has important potential applications in such areas as image processing and pattern recognition. Its continuous time feature allows real-time signal processing and its local interconnection feature makes it easy for VLSI implementation View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Guiding principles in controlling small automated vehicles

    Publication Year: 1995 , Page(s): 366 - 370 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (356 KB)  

    This paper describes the principles of a control program that was used to drive a self-propelled, 25 HP lawnmower. The course to follow was predetermined and an integral part of the software program. It consisted of straight lines, 90 and 180 degree turns. The two critical pieces of information were the offset error and the angle the mower was, relative to the desired course. Determination of the angle was difficult and was achieved with limited success. The lawnmower was able to follow the course with an error of less than 8 cm (first standard deviation). The author discusses the Accutrak Positioning System, the control computers, and steering control View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tools for rapid prototyping and microelectronic system design

    Publication Year: 1995 , Page(s): 468 - 472 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    Microelectronic system design is undergoing rapid changes that dramatically affect the way microelectronic systems are designed and implemented. These changes are also having a direct impact on the way microelectronic design is taught in technical study programs such as engineering. We have been involved in a project over the past year to develop an environment for the design and rapid prototyping of small-scale systems. This paper describes our experiences with the system design and rapid prototyping tools that were evaluated during that period View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ray-tracing studies in a perturbed atmosphere

    Publication Year: 1995 , Page(s): 386 - 391 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    We report the development of a new ray-tracing simulation tool having the potential of the full characterization of a radio link through the accurate study of the propagation path of the signal from the transmitting to the receiving antennas across a perturbed atmosphere. The ray-tracing equations are solved, with controlled accuracy, in three dimensions (3D) and the propagation characteristics are obtained using various refractive index models. The launching of the rays, the atmospheric medium and its disturbances are characterized in 3D. The software evaluates the ray trajectory, beam spreading, the transmitted/received power taking account of the radiation pattern and orientation of the antennas and finally, the polarization state of the beam. The novelty in the approach stems from the use of special numerical techniques dealing with so called stiff differential equations without which no solution of the ray-tracing equations is possible. Some previously known results are presented for comparative purposes and new results are presented as well as some of the capabilities of the software View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tuning of the stochastic model of dielectric discharges

    Publication Year: 1995 , Page(s): 318 - 320 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB)  

    The stochastic model introduced by Niemeyer, Pietronero, and Wiesmann (NPW model) intuitively relates the growth of stochastic processes such as diffusion limited aggregates and electrical treeing in dielectrics to the strength of the applied electric field (1984). The NPW model incorporates a tuning parameter η that modifies the effect of the field gradient, thus allowing tuning to specific stochastic processes. Tuning the NPW model to actual examples of DLAs and Lichtenberg figures shows there are limitations View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-speed differential protection of parallel teed transmission lines

    Publication Year: 1995 , Page(s): 495 - 500 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (452 KB)  

    This paper presents high-speed differential protection algorithm for parallel-teed transmission lines. The algorithm uses distributed parameter models of the transmission lines and synchronized sampling of data at the terminals of the line. A method that takes the unsynchronised data and generates synchronised information is described. The proposed algorithm uses a segregated scheme, facilitates the coordination of multiphase tripping and reclosing on HV and EHV parallel-teed transmission lines. A relaying system design based on the proposed algorithm is also discussed The proposed system was tested extensively by using data that was generated by using the EMTDC and sample power systems. Results show that the system remains stable during normal operation of the power system and during external faults. The relaying system is sensitive and fast and does not jeopardize security. Some test results are included in the paper View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Autonomous power management system for a small satellite

    Publication Year: 1995 , Page(s): 312 - 317 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (580 KB)  

    An argument that a fuzzy system design methodology is better suited for the design of autonomous power systems than the currently used classical expert system methodology is presented. An architecture that incorporates fuzzy systems is developed for designing autonomous power management systems. The architecture was designed to meet both present and projected future technological requirements for satellite autonomy. Systems with varying degrees of autonomy can be implemented by varying the number of modules and their complexity. Detailed design, based on the proposed architecture, is given of a system with Level 5 autonomy. This system was implemented on a low cost 8-bit microprocessor and required less than 6 kBytes of memory. The power management system implemented was shown to perform the required autonomy functions through experiments in which it was required to follow a sequence of commands given in the form of a load switching schedule. After the power management system passed the command execution test, faults were introduced in the load to test its fault tolerance capabilities. The system was able to detect, identify and take appropriate action whenever an anomaly was introduced View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of modern power electronics in power tapping from HVDC transmission systems

    Publication Year: 1995 , Page(s): 306 - 311 vol.2
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    In this paper, the problem of small power tapping from HVDC transmission systems is presented, and a practical solution, based on the solid state devices currently available in the market, is proposed. The proposed scheme, is then digitally simulated with the aid of the EMTDC/PSCAD software package. Simulation results prove the practicality of the proposed scheme. The performance of the control systems, however, needs to be improved View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Approximate method for polling systems with time-limited-based polling tables

    Publication Year: 1995 , Page(s): 398 - 402 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    Time-limited based polling systems with polling tables are encountered frequently in operating systems schedulers such as the fair share scheduler. The analysis of such systems are usually carried out by simulation. We present a simple approximation for determining the mean waiting times in such polling systems. This approximation can be used by system designers to carry out a first cut design to reduce the set of alternative designs and then use simulation to assess a few good designs. The method transforms the M table polling system with N distinct stations, (N⩽M), to an equivalent M pseudostations cyclic polling system. It then uses the known K-limited polling results by approximating K from the time limit and the mean service time of each station. Polling systems are a class of multiqueueing systems attended to a single server. Such systems are encountered very frequently in communications and computer, traffic signal, and also manufacturing systems. For computer systems in a multiprogramming environment we would like to keep the CPU busy all the time (a 100% utilization would be optimal) View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new positive sequence directional element for numerical distance relays

    Publication Year: 1995 , Page(s): 334 - 339 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (500 KB)  

    This paper describes a new positive sequence directional element for use in numerical distance relays. Results are shown for the performance of the element in relays on the Manitoba Hydro network during disturbances and from tests on the Real Time Digital Simulator (RTDS) in the Power Systems Laboratory at the University of Manitoba View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Image processing methods for identifying species of plants

    Publication Year: 1995 , Page(s): 403 - 408 vol.2
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB)  

    More selective methods for applying agricultural herbicides on fields can result in substantial cost savings. Three image processing methods were tested for their ability to identify four different images of plant species. First two images were different and the other two were similar. The images are preprocessed by segmentation and spatial filtering using the Color Chromaticity Chart. The test results provide evidence that texture based methods can provide a useful metric for distinguishing between some species of plants View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • HVDC transmission system models for power system reliability evaluation

    Publication Year: 1995 , Page(s): 501 - 507 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (460 KB)  

    High voltage direct current transmission (HVDC) systems are finding increased use for long distance transmission of electrical energy from remote hydro electric generating stations to the load centers. The area of reliability evaluation of HVDC transmission systems has not attracted much attention in the past. The situation is changing as more and more DC links are being built, the need to develop methods for assessing the impact of these links on the overall system adequacy is increasing. This paper illustrates a technique for modeling the HVDC links. These models were then integrated into the overall system reliability studies. A simple system example was used to illustrate the technique. Practical system studies incorporating the developed model are illustrated. Finally the data requirements for modeling HVDC links in reliability studies are discussed View full abstract»

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