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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： K. Aniserowicz A. Skorek C. Cossette M.B. Zaremba Faculty of Electrical Engineering Technical University of Bialystok Bialystok Poland Industrial Electroheat Laboratory University of Quebec Trois-Riviéres Trois-Rivieres QUE Canada Department of Computer Science University of Quebec Hull Hull QUE Canada

This paper presents an algorithm for finite element simulation induction heating of steel cylinders. Such cylinders have been installed as calender rolls in the Calcoil system for paper plants. This algorithm is used in place of the pre-processor module in EMRC NISA II software. A special pre-processing program has been designed for modelling of a typical section of the cylinder. Computed results are compared to infrared measurements of a laboratory model of a calender roll. And, finally, the possibilities of utilizing and developing the algorithm are discussed.< >

关键词： Finite element methods Steel Engine cylinders Control systems Coils Senior members Laboratories Moisture Heating Shape

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DESIGN BY INTERPOLATION

DESIGN BY INTERPOLATION

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COMPEURO 93 : computerS IN DESIGN, MANUFACTURING AND PRODUCTION

作者： WEISS, M SHPITALNI, M Laboratory for Computer Graphics CAD Faculty of Mechanical Engineering Technion Haifa Israel

ISBN: (纸本)0818640308

The paper deals with design of shapes by interpolation, that is, cases where the desired shape is somehow "in between" two given shapes. The main issues involved in design by interpolation are: (a) capturing the "nature" (behavior) of the guiding shapes A and B;(b) attaining automatic correspondence between points (i.e., which point in shape A should be associated with which point in shape B);and (c) determining the interpolation method In the paper, new techniques for capturing the "nature" of shapes and for determining automatic correspondence of points are presented. Examples for interpolation of polygons, curves (Bezier and NURBS) and suvaces are included. The possibility of future design based upon extrapolation, rather than interpolation,is also discussed. © 1993 IEEE.

关键词： Bezier CAD Interpolation NURBS Shape Design

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EFFECTS OF DIRECT ELECTRIC-CURRENT ON THE GROWTH OF MICROBES AND THEIR SUSCEPTIBILITY TO ANTIBIOTICS

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BIOELECTROCHEMISTRY AND BIOENERGETICS 1993年第1-3期30卷 173-180页

作者： KARBA, R GUBINA, M VODOVNIK, L Laboratory for Biocybernetics Faculty of Electrical and Computer Engineering Trz̆ăska 25 University of Ljubljana 61000 Ljubljana Slovenia

The in vitro effect of weak constant direct electric current on the growth of the bacteria Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Bacillus subtilis, and Candida albicans yeast was examined. Of the microbes tested, significant changes in colony formation could be obtained only with C albicans. The growth inhibition of C. albicans increased with the amplitude and application time of the electric current. This effect proved to be reversible. No significant effect of direct current was observed on bacterial growth. Increased susceptibility of S. aureus to Ofloxacin, Ciprofloxacin, Piperacillin and Amikacin, of P. aeruginosa to Ofloxacin and Amikacin, and of E. coli to Ciprofloxacin and Piperacillin was noticed after simultaneous exposure of the bacteria to electric current and antibiotics.

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CNC interpolators: algorithms and analysis

CNC interpolators: algorithms and analysis

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Proceedings of the 1993 ASME Winter Annual Meeting

作者： Koren, Y. Lo, C.C. Shpitalni, M. Department of Mechanical Engineering University of Michigan Ann Arbor MI United States Laboratory for Computer Graphics and CAD Faculty of Mechanical Engineering Technion Haifa Israel

ISBN: (纸本)0791810291

CAD systems today interpolate general curves by dividing each curve into many straight-line segments which are downloaded to the CNC. Determining the number of lines to be transferred from the CAD to the CNC poses a conflict between the desired precision of the part and the feedrate fidelity. The current method results in severe variations in the feedrate, leading, in turn, to variations in the surface smoothness and a substantial increase in machining time. These problems are caused by the acceleration/deceleration at the ends of each segment. Moreover, the problems are inherent in the CNC interpolator, as is thoroughly discussed in this paper. These problems can be solved by the development of curve interpolation algorithms for CNC. In this paper, a real-time interpolation algorithm for curves presented in their parametric forms is proposed and compared with the existing CAD interpolators. Analysis shows that with this new interpolator, a constant feed is maintained along the cut and the machining time is as expected. In addition, the amount of geometric information transferred from the CAD system to the CNC is reduced by orders of magnitude. Moreover, the contour errors caused by the new interpolator are much smaller than those caused by conventional CAD interpolators.

关键词： Numerical control systems

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Separating diffuse and specular component of image irradiance by translating a camera 5th

Separating diffuse and specular component of image irradianc...

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5th International Conference on computer Analysis of Images and Patterns, CAIP 1993

作者： Jaklič, Aleš Solina, Franc Computer Vision Laboratory Faculty of Electrical Engineering and Computer Science University of Ljubljana Tržaška cesta 25 Ljubljana61001 Slovenia

ISBN: (纸本)9783540572336

In this paper we discuss a possible use of camera translation to separate diffuse and specular component of image irradiance. For a moving observer specular reflection appears to "slide" on the object surface. The proposed method is based on the analysis of image sequence obtained during camera translation. By modeling image irradiance as a sum of specular and diffuse component and estimating the motion of the two components we can separate them by filtering the image sequence with two filters. © 1993, Springer Verlag. All rights reserved.

关键词： Cameras

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Automatic planning of robot pushing operations

Automatic planning of robot pushing operations

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Z. Balorda Faculty of Electrical and Computer Engineering Laboratory for Robotics Ljubljana Slovenia

A method for automatic planning of robot pushing operations is described. The operation is performed by a two-point pusher. It has been shown that such an operation can entirely constrain polygonal workpiece in a plane and can deal with objects in the presence of initial uncertainty. The operation is discussed with regard to bounds on initial error in position and orientation. The success of an attempt to push the object depends on correct pushing direction and starting point of the pusher. The goal is to catch the object between the fingers and to eventually bring it to known position and orientation. The starting point and the pushing direction define an operation space of all possible tasks. A bounded region in this space is constructed, such that any point inside this region guarantees the object will not be pushed away. The planner also accounts for the uncertainty in positioning, suggesting the pushing operation that will succeed even if worst case error occurs.< >

关键词： Robotics and automation Uncertainty Fingers Laboratories Orbital robotics Materials handling Grippers Fixtures Robot sensing systems Computational geometry

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NUMERICAL-SIMULATION OF CURRENT-VOLTAGE CHARACTERISTICS OF SILICON PHOTOCONDUCTIVE CIRCUIT ELEMENTS

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第3期6卷 221-231页

作者： SHAKOURI, H LIOU, JJ Electrical and Computer Engineering Department University of Central Florida Orlando FL 32816 U.S.A. Juin J. Liou received the B.S. (Honours) M.S. and Ph.D. degrees in electrical engineering from the Univeristy of Florida Gainesville in 1982 1983 and 1987 respectively. HIs doctoral research with Dr F. A. Lindholm involved the characterization of the space-charge region of semiconductor junction devices. From 1985 to 1986 he was an Instructor in the Department of Electrical Engineering at the University of Florida. In 1987 he joined the Department of Electrical Engineering at the University of Central Florida Orlando where he is now an Associate Professor. His current research interests are in CAD tool development circuit simulation and modelling semiconductor devices including homojunction bipolar transistors heterojunction bipolar transistors junction field-effect transisstors solar cells and photoconductivity siwtching devices. Dr Liou has published more than 100 technical papers in refreed journals and international and national conference proceedings. He has served as a technical reviewer for several journals and conferences as well as an associate editor for theSimulationjournal under the area of VLSI and circuit simulation. His honours and awards include: Outstanding Young Men of American in 1987 Distinguished Researcher Award Electrical Engineering Department University of Central Florida in 1988 1989 and 1991 Distinguished Researcher Award College of Engineering University of Centeral Florida in 1991 Engineer of the Year IEEE Orlando Section 1992 Eminent Engineer Tau Beta Pi 1992. In the summer of 1992 Dr Liou worked at Solid State Laboratory Wright-Patterson Air Force Base Ohio as a Summer Research Faculty sponsored by the Air Force Office of Scientific Research.

Photoconductive circuit elements (PCEs) are suitable for switching applications: they can be turned on and off rapidly, they can conduct a large current in the 'on' state when applying a laser or other optical excitation containing high energy photons exceeding the silicon band gap energy, they have a large resistance in the 'off' state when the light is off, and they can be fabricated using a simple process. We report the steady-state characteristics of PCEs simulated from a two-dimensional simulator called PISCES-2B. The effects of the conducting channel length, the resistivity of the intrinsic silicon, and the type of contact region on the performance of the PCE will be investigated and discussed. Based on the simulation results, optimal PCE device make-ups will also be suggested.

关键词： Photoconducting materials

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Educational use of a microwave electromagnetic analysis of 3-D planar structures

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computer Applications in engineering Education 1993年第3期1卷 243-243页

作者： Rautio, J.C. Sonnet Software Inc. Suite 203 135 Old Cove Road Liverpool NY 13090 Dr. James C. Rautio:founded Sonnet Software a developer of 3-D planar electromagnetic microwave software in 1983 with support from the David Sarnoff Research Center Hewlett Packard General Electric and Syracuse University. He has served as a visiting member of the faculty at Syracuse University and as an adjunct faculty member at Cornell University teaching microwave and computer courses as well as pursuing research in electromagnetics. Dr. Rautio previously worked in General Electric's Space Division and Electronics Laboratory. He designed microwave circuits including filters for a Landsat receiver and various GaAs microwave integrated circuits. He also developed microwave and millimeter wave automated measurement equipment and wrote a large microwave circuit analysis program. Dr. Rautio holds a BS in Electrical Engineering from Cornell University an MS in Systems Engineering from the University of Pennsylvania and a PhD in Electrical Engineering from Syracuse University

The use of an electromagnetic analysis of 3-D planar structures is described with respect to the educational requirements of students from the college freshman level through the graduate level. The analysis is intended primarily for microwave use; however, there is also significant potential interest from the student of high speed digital design. The analysis is used for passive planar circuits with any number of layers. The third dimension is represented by vias. A mature graphical user interface is provided allowing rapid capture of structure geometry, color visualization, and animation of the resulting current distributions. The software is also explicitly designed to work in conjunction with popular circuit theory based microwave software and with SPICE.

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FEATURE REPRESENTATIONS AND CLASSIFICATION PROCEDURES FOR SLOVENE PHONEME RECOGNITION

引用

PATTERN RECOGNITION LETTERS 1992年第12期13卷 879-891页

作者： MIHELIC, F IPSIC, I DOBRISEK, S PAVESIC, N Laboratory for Artificial Perception Faculty of Electrical and Computer Engineering Tržaška 25 Ljubljana Slovenia

In this paper the comparison of performances of different feature representations of the speech signal and comparison of classification procedures for Slovene phoneme recognition are presented. Recognition results are obtained on the database of continuous Slovene speech consisting of short Slovene sentences spoken by female speakers. MEL-cepstrum and LPC-cepstrum features combined with the normalized frame loudness were found to be the most suitable feature representations for Slovene speech. It was found that determination of MEL-cepstrum using linear spacing of bandpass filters gave significantly better results for speaker dependent recognition. Comparison of classification procedures favours the Bayes classification assuming normal distribution of the feature vectors (BNF) to the classification based on quadratic discriminant functions (DF) for minimum mean-square error and subspace method (SM), which does not confirm the results obtained in some previous studies for German and Finn speech. Additionally, classification procedures based on hidden Markov models (HMM) and the Kohonen Self-Organizing Map (KSOM) were tested on a smaller amount of speech data (1 speaker only). Classification results are comparable with classification using BNF.

关键词： SPEECH RECOGNITION PHONE COMPONENTS RECOGNITION FEATURE EXTRACTION AND SELECTION CLASSIFICATION QUADRATIC DISCRIMINANT FUNCTIONS SUBSPACE METHOD HIDDEN MARKOV MODELS KOHONEN SELF-ORGANIZING MAP

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Selective scene modeling

Selective scene modeling

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International Conference on Pattern Recognition

作者： F. Solina A. Leonardis Computer Vision Laboratory Faculty of Electrical Engineering and Computer Science University of Ljubljana Ljubljana Slovenia

Proposes an efficient architecture for selective image modeling. The authors give an example in which models of different scale are reconstructed in parallel. It is shown that this redundant representation can effectively be pruned using the criterion of minimum description length. Models that are selected in the final description indicate the appropriate scale of observation.< >

关键词： Layout Image reconstruction computer architecture Machine vision computer vision Biological system modeling Shape Laboratories computer science Biological information theory

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