Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.526586
I.J.H. Leung, J. E. Jordan
Image segmentation of weather satellite imagery is an important first step in an automated weather forecasting system. Accurate cloud extraction is also important in the determination of solar radiative transfer in atmospheric research, where satellite observations are used as inputs to global climate models to predict climatic change. Most of the current cloud extraction algorithms tend to be quite complicated to implement and execution time is potentially slow. The authors present a new algorithm which is simple to implement, fast in execution and provides good results in initial tests.
{"title":"Image processing for weather satellite cloud segmentation","authors":"I.J.H. Leung, J. E. Jordan","doi":"10.1109/CCECE.1995.526586","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526586","url":null,"abstract":"Image segmentation of weather satellite imagery is an important first step in an automated weather forecasting system. Accurate cloud extraction is also important in the determination of solar radiative transfer in atmospheric research, where satellite observations are used as inputs to global climate models to predict climatic change. Most of the current cloud extraction algorithms tend to be quite complicated to implement and execution time is potentially slow. The authors present a new algorithm which is simple to implement, fast in execution and provides good results in initial tests.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114204586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.528080
P. Noutsios, G. Yip
An improved vertical coupling structure, consisting of a graded-index planar buried waveguide in glass and a dielectric overlayer, is designed and realized to provide an optimum edge coupling to a modelled GaAs photodetector. Calculations of the attenuation coefficient and coupling efficiency show an optimum absorption behavior. Normal mode measurements and beam propagation calculations of the coupling length and power transfer ratio are compared.
{"title":"Vertically integrated optical directional couplers in glass for improved edge coupling to a thin-film photodetector","authors":"P. Noutsios, G. Yip","doi":"10.1109/CCECE.1995.528080","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528080","url":null,"abstract":"An improved vertical coupling structure, consisting of a graded-index planar buried waveguide in glass and a dielectric overlayer, is designed and realized to provide an optimum edge coupling to a modelled GaAs photodetector. Calculations of the attenuation coefficient and coupling efficiency show an optimum absorption behavior. Normal mode measurements and beam propagation calculations of the coupling length and power transfer ratio are compared.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120951115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.526580
Xining Li
This paper presents a distributed logic programming language proposal-Communicating Sequential Prolog* (CSP*). CSP* inherits most its features from Prolog and provides a process-oriented programming environment for distributed discrete event simulations. We discuss some language issues and programming examples to reveal the simplicity, flexibility, and the expressivity.
{"title":"Distributed simulation in CSP*","authors":"Xining Li","doi":"10.1109/CCECE.1995.526580","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526580","url":null,"abstract":"This paper presents a distributed logic programming language proposal-Communicating Sequential Prolog* (CSP*). CSP* inherits most its features from Prolog and provides a process-oriented programming environment for distributed discrete event simulations. We discuss some language issues and programming examples to reveal the simplicity, flexibility, and the expressivity.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121381463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.528202
K. Idir, Liuchen Chang
This paper presents an investigation into the effects of the positions of ventilation holes and mounting holes on the magnetic field of a 1130 kVA synchronous generator, using two-dimensional finite element analysis. The flux densities in the stator yoke, stator teeth and airgap are determined for various positions of ventilation holes and mounting holes. The results of the study are presented and discussed. These results provide technical support to machine design, in particular the calculation of magnetization current.
{"title":"The effects of ventilation and mounting holes on the magnetic field of a synchronous generator","authors":"K. Idir, Liuchen Chang","doi":"10.1109/CCECE.1995.528202","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528202","url":null,"abstract":"This paper presents an investigation into the effects of the positions of ventilation holes and mounting holes on the magnetic field of a 1130 kVA synchronous generator, using two-dimensional finite element analysis. The flux densities in the stator yoke, stator teeth and airgap are determined for various positions of ventilation holes and mounting holes. The results of the study are presented and discussed. These results provide technical support to machine design, in particular the calculation of magnetization current.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"22 6S 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133266841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.526562
M. C. Ghanem, K. Al-haddad, G. Roy
The main objective of this work is a comparison of three nonpollutant AC-DC convertor topologies with unity power factor and high efficiency, in order to derive maximum benefit from the assembly utilised while ensuring AC/DC conversion. Discussion of the principle of comparison is followed by a detailed analysis and tables showing the advantages and disadvantages of each convertor. The results of simulation of the three proposed convertors are presented.
{"title":"Comparative study of AC/DC convertors with unity power factor","authors":"M. C. Ghanem, K. Al-haddad, G. Roy","doi":"10.1109/CCECE.1995.526562","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526562","url":null,"abstract":"The main objective of this work is a comparison of three nonpollutant AC-DC convertor topologies with unity power factor and high efficiency, in order to derive maximum benefit from the assembly utilised while ensuring AC/DC conversion. Discussion of the principle of comparison is followed by a detailed analysis and tables showing the advantages and disadvantages of each convertor. The results of simulation of the three proposed convertors are presented.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133928576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.526289
J. Belzile, F. Gagnon, D. Haccoun
In this paper the performance of convolutional decoding over fading channels is explored, The decoding algorithm used are the Viterbi and bidirectional algorithms. By estimating a "decoder weight spectrum" for the decoder, an "equivalent free distance" may be observed. Furthermore, using this "decoder weight spectrum" useful estimations of the error probabilities are obtained and compared to computer simulation results in the case of very slow and very fast fading. The resultant curves are shown to be very tightly related.
{"title":"Fading channel performance analysis for the decoding of convolutional codes","authors":"J. Belzile, F. Gagnon, D. Haccoun","doi":"10.1109/CCECE.1995.526289","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526289","url":null,"abstract":"In this paper the performance of convolutional decoding over fading channels is explored, The decoding algorithm used are the Viterbi and bidirectional algorithms. By estimating a \"decoder weight spectrum\" for the decoder, an \"equivalent free distance\" may be observed. Furthermore, using this \"decoder weight spectrum\" useful estimations of the error probabilities are obtained and compared to computer simulation results in the case of very slow and very fast fading. The resultant curves are shown to be very tightly related.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125047060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.526411
Jean-Marie Dirand, V. Chevrier, R. González-Rubio
To illustrate the approaches of the Quintus flex/Prolog system and the Nancy University blackboard-based applications generator, the authors undertake a comparison of modules of an expert system for electric transformer design, implemented on the respective development systems. After setting some typical instances in context, they present the different implementations at the levels of knowledge representation, management of control in the reasoning process, and the treatments themselves. The approaches are compared in terms of ease of knowledge modelling and structuring, control of reasoning, and capacity of treatment.
{"title":"Comparative study of two knowledge-based development systems: flex/Prolog and ATOME/LISP","authors":"Jean-Marie Dirand, V. Chevrier, R. González-Rubio","doi":"10.1109/CCECE.1995.526411","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526411","url":null,"abstract":"To illustrate the approaches of the Quintus flex/Prolog system and the Nancy University blackboard-based applications generator, the authors undertake a comparison of modules of an expert system for electric transformer design, implemented on the respective development systems. After setting some typical instances in context, they present the different implementations at the levels of knowledge representation, management of control in the reasoning process, and the treatments themselves. The approaches are compared in terms of ease of knowledge modelling and structuring, control of reasoning, and capacity of treatment.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134161933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.528127
K. Sedraoui, K. Al-haddad, A. Chandra, C. Millet
A strategy to eliminate the vibrations generated by the harmonics of armature reaction in the stator of hydrogenerators is described in this paper. It consists of the verification and optimization of the stator winding configuration, considering that the three phase currents in the windings are sinusoidal and balanced, and that the induction is proportional to the magnetomotive force. Calculation of the coefficients dependent on winding configuration leads to the formulation of the vibration causing forces. Furthermore, this approach permits the determination of the relative amplitude of the radial efforts caused by the armature reaction on the magnetic circuit. The standard solutions, such as chording, are insufficient to solve all the different problems. A new method based on the rearrangement of the conductors distribution to neutralize the harmonics that cause the deformation of the space wave is experimented upon.
{"title":"A strategy to reduce the vibrations generated by the harmonics of armature reaction in hydro generators","authors":"K. Sedraoui, K. Al-haddad, A. Chandra, C. Millet","doi":"10.1109/CCECE.1995.528127","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528127","url":null,"abstract":"A strategy to eliminate the vibrations generated by the harmonics of armature reaction in the stator of hydrogenerators is described in this paper. It consists of the verification and optimization of the stator winding configuration, considering that the three phase currents in the windings are sinusoidal and balanced, and that the induction is proportional to the magnetomotive force. Calculation of the coefficients dependent on winding configuration leads to the formulation of the vibration causing forces. Furthermore, this approach permits the determination of the relative amplitude of the radial efforts caused by the armature reaction on the magnetic circuit. The standard solutions, such as chording, are insufficient to solve all the different problems. A new method based on the rearrangement of the conductors distribution to neutralize the harmonics that cause the deformation of the space wave is experimented upon.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129127284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.526302
M. El-Kahel, G. Olivier, G. April, C. Guimaraes
This work presents transformers used by a new family of polyphase power convertors having an odd number of phases which is not a multiple of 3. The special feature of these transformers is that the judicious arrangement of their windings ensures an equitable distribution in power semiconductors, making them suitable for heavy-current industrial applications. The structure of these transformers also makes it possible to increase the number of phases of these power convertors, the effect of which is to reduce the DC ripple and the harmonic currents inflicted on the AC supply network.
{"title":"Five- and seven-phase conversion transformers","authors":"M. El-Kahel, G. Olivier, G. April, C. Guimaraes","doi":"10.1109/CCECE.1995.526302","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526302","url":null,"abstract":"This work presents transformers used by a new family of polyphase power convertors having an odd number of phases which is not a multiple of 3. The special feature of these transformers is that the judicious arrangement of their windings ensures an equitable distribution in power semiconductors, making them suitable for heavy-current industrial applications. The structure of these transformers also makes it possible to increase the number of phases of these power convertors, the effect of which is to reduce the DC ripple and the harmonic currents inflicted on the AC supply network.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"81 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134106537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.528085
P. Michaud, R. Gonzalez Rubio
The learning capacity of artificial neural nets removes the need to formulate a model or to extract knowledge for the implementation of any correspondence function. On the other hand, the design process calls for a certain number of iterations before one can find the right configuration and learning parameters for use in a given application. To mitigate this difficulty, NEUREX has been designed to consist of an expert system and an artificial neural net simulator. It supervises autonomously the process of design in the same way as would an experienced designer, and is currently in readiness to supervise artificial neural net design using standard backpropagation.
{"title":"NEUREX-an expert system for the autonomous design of artificial neural nets","authors":"P. Michaud, R. Gonzalez Rubio","doi":"10.1109/CCECE.1995.528085","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528085","url":null,"abstract":"The learning capacity of artificial neural nets removes the need to formulate a model or to extract knowledge for the implementation of any correspondence function. On the other hand, the design process calls for a certain number of iterations before one can find the right configuration and learning parameters for use in a given application. To mitigate this difficulty, NEUREX has been designed to consist of an expert system and an artificial neural net simulator. It supervises autonomously the process of design in the same way as would an experienced designer, and is currently in readiness to supervise artificial neural net design using standard backpropagation.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132941863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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