Pub Date : 1998-05-24DOI: 10.1109/CCECE.1998.685539
A. Sana, R. Marceau, C. Todde, D. Do, J. Mahseredjian, G. Joós
For more than a century electric networks have evolved on the basis of a three phase symmetrical equilibrium system. If the current and voltage distortion is seen as inevitable in the daily exploitation, the philosophy basically remains the same: the three phases are considered as a single symmetric ensemble. In high, very high and ultra high voltage (HV, VHV, and UHV) the appearance of a contingency automatically carries out cutting of the three phase line into single, two or three phases all at once. But, having the same reaction vis-a-vis the whole, the case of faults is not optimal. In this article, we effect a revue of methods and criteria actually used in the assertion of security limits, we set out the concepts and basis of constraints binding the exploitation of a three phase line as three independent lines and discuss a realisable solution for the exploitation of a HV or VHV transmission network managing asymmetry and security.
{"title":"The exploitation of asymmetry in electric power transmission networks","authors":"A. Sana, R. Marceau, C. Todde, D. Do, J. Mahseredjian, G. Joós","doi":"10.1109/CCECE.1998.685539","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685539","url":null,"abstract":"For more than a century electric networks have evolved on the basis of a three phase symmetrical equilibrium system. If the current and voltage distortion is seen as inevitable in the daily exploitation, the philosophy basically remains the same: the three phases are considered as a single symmetric ensemble. In high, very high and ultra high voltage (HV, VHV, and UHV) the appearance of a contingency automatically carries out cutting of the three phase line into single, two or three phases all at once. But, having the same reaction vis-a-vis the whole, the case of faults is not optimal. In this article, we effect a revue of methods and criteria actually used in the assertion of security limits, we set out the concepts and basis of constraints binding the exploitation of a three phase line as three independent lines and discuss a realisable solution for the exploitation of a HV or VHV transmission network managing asymmetry and security.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134382111","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685648
N. Wanas, G. Auda, M. Kamel, F. Karray
In this study we show, empirically, that the best performance of a neural network occurs when the number of hidden nodes is equal to log(T), where T is the number of training samples. This value represents the optimal performance of the neural network as well as the optimal associated computational cost. We also show that the measure of entropy in the hidden layer not only gives a good foresight to the performance of the neural network, but can be used as a criteria to optimize the neural network as well. This can be achieved by minimizing the network entropy (i.e. maximizing the entropy in the hidden layer) as a means of modifying the weights of the neural network.
{"title":"On the optimal number of hidden nodes in a neural network","authors":"N. Wanas, G. Auda, M. Kamel, F. Karray","doi":"10.1109/CCECE.1998.685648","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685648","url":null,"abstract":"In this study we show, empirically, that the best performance of a neural network occurs when the number of hidden nodes is equal to log(T), where T is the number of training samples. This value represents the optimal performance of the neural network as well as the optimal associated computational cost. We also show that the measure of entropy in the hidden layer not only gives a good foresight to the performance of the neural network, but can be used as a criteria to optimize the neural network as well. This can be achieved by minimizing the network entropy (i.e. maximizing the entropy in the hidden layer) as a means of modifying the weights of the neural network.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133279678","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685560
S. Kebreau, S. Pierre, W. Probst
This paper presents a model of filtering agents for the search of information from heterogeneous sources. This model deals in particular with user requests and with source requests in the process of information filtering. Typically, a task of filtering is subdivided into sub-tasks, which are then executed by different agents; each endowed with a specific expertise. These agents are thus integrated into a multi-agent architecture. The communication between the agents is accomplished by the exchange of messages expressed in the KQML and ISAME languages, using previously-defined ontologies.
{"title":"Modelling intelligent agents for information filtering","authors":"S. Kebreau, S. Pierre, W. Probst","doi":"10.1109/CCECE.1998.685560","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685560","url":null,"abstract":"This paper presents a model of filtering agents for the search of information from heterogeneous sources. This model deals in particular with user requests and with source requests in the process of information filtering. Typically, a task of filtering is subdivided into sub-tasks, which are then executed by different agents; each endowed with a specific expertise. These agents are thus integrated into a multi-agent architecture. The communication between the agents is accomplished by the exchange of messages expressed in the KQML and ISAME languages, using previously-defined ontologies.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132811545","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685639
A. Torabian, Y. Chow
With high Q circuits, one requires accurate analysis with less than 1% error. This paper uses a new hybrid method to analysis high order high and planar microwave filters. This method which is based on the 2D contour integral and the 3D moment method, is very fast and accurate.
{"title":"A fast and accurate analysis of high order patch filters","authors":"A. Torabian, Y. Chow","doi":"10.1109/CCECE.1998.685639","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685639","url":null,"abstract":"With high Q circuits, one requires accurate analysis with less than 1% error. This paper uses a new hybrid method to analysis high order high and planar microwave filters. This method which is based on the 2D contour integral and the 3D moment method, is very fast and accurate.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133554703","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685617
B. Singh, B.N. Singh, A. Chandra
This paper deals with a DSP based implementation of a new control method of a 3-phase active filter (AF) to compensate harmonics and reactive power of nonlinear loads. A current controlled voltage source inverter (CC-VSI) based configuration is used as the AF and PWM current control technique is used to derive gating signals to the devices of the AF. A 3-phase diode bridge rectifier with resistive-inductive loading is taken as the nonlinear load. Steady state as well as transient test results on a developed prototype are given to validate the new control method for the AF.
{"title":"Real time DSP based implementation of a new control method of active power filter","authors":"B. Singh, B.N. Singh, A. Chandra","doi":"10.1109/CCECE.1998.685617","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685617","url":null,"abstract":"This paper deals with a DSP based implementation of a new control method of a 3-phase active filter (AF) to compensate harmonics and reactive power of nonlinear loads. A current controlled voltage source inverter (CC-VSI) based configuration is used as the AF and PWM current control technique is used to derive gating signals to the devices of the AF. A 3-phase diode bridge rectifier with resistive-inductive loading is taken as the nonlinear load. Steady state as well as transient test results on a developed prototype are given to validate the new control method for the AF.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133214740","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685602
A. Karmouch, E. Horlait
Mobile agents have emerged as a new paradigm for communications and are proving to be more flexible than the average client in the client-server model. In the mobile agent architecture a script or program is sent to the remote severs to be executed, therefore taking advantage of the servers' resources and operating closer to the services. We describe an agent-based architecture suitable for the multimedia applications. This architecture is composed of user agent, service agent and a mobile agent that travels the network to perform tasks on behalf of a user or an application. The results gathered by the mobile agent are presented to the user by means of a rendering system based on a real-time transport protocol (RTP).
{"title":"Agent-based multimedia communications on Internet","authors":"A. Karmouch, E. Horlait","doi":"10.1109/CCECE.1998.685602","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685602","url":null,"abstract":"Mobile agents have emerged as a new paradigm for communications and are proving to be more flexible than the average client in the client-server model. In the mobile agent architecture a script or program is sent to the remote severs to be executed, therefore taking advantage of the servers' resources and operating closer to the services. We describe an agent-based architecture suitable for the multimedia applications. This architecture is composed of user agent, service agent and a mobile agent that travels the network to perform tasks on behalf of a user or an application. The results gathered by the mobile agent are presented to the user by means of a rendering system based on a real-time transport protocol (RTP).","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116758267","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685555
H. Pinheiro, P. Jain, G. Joós
This paper describes and analyses an isolated single-phase bidirectional DC-to-AC converter for uninterruptible power supply systems. The main achievements of the proposed converter are: (i) operation with zero voltage switching at all load conditions; (ii) inherent protection against short circuits in the load; (iii) high quality output waveform; (iv) isolation between the DC and AC sides using high frequency transformer; and (v) the leakage induction of the transformer is used as part of the series resonant inductor. The operating principles of the DC-to-AC converter are described and the relation among the power circuit variables are derived. Experimental results, which substantiate the analysis and demonstrate the feasibility of the DC-to-AC converter, are given.
{"title":"Zero voltage switching series resonant based DC-AC converter","authors":"H. Pinheiro, P. Jain, G. Joós","doi":"10.1109/CCECE.1998.685555","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685555","url":null,"abstract":"This paper describes and analyses an isolated single-phase bidirectional DC-to-AC converter for uninterruptible power supply systems. The main achievements of the proposed converter are: (i) operation with zero voltage switching at all load conditions; (ii) inherent protection against short circuits in the load; (iii) high quality output waveform; (iv) isolation between the DC and AC sides using high frequency transformer; and (v) the leakage induction of the transformer is used as part of the series resonant inductor. The operating principles of the DC-to-AC converter are described and the relation among the power circuit variables are derived. Experimental results, which substantiate the analysis and demonstrate the feasibility of the DC-to-AC converter, are given.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125194781","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685545
I. Khan, F. Corbett, H. Card
This paper compares four computer-based teaching technologies. In addition, it describes a framework for a computerized adaptive tutor (CAT) for novice financial investors. Finally, it presents a model to represent both the domain knowledge of the tutor and the student.
{"title":"Computerized adaptive tutor: educating financial investors","authors":"I. Khan, F. Corbett, H. Card","doi":"10.1109/CCECE.1998.685545","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685545","url":null,"abstract":"This paper compares four computer-based teaching technologies. In addition, it describes a framework for a computerized adaptive tutor (CAT) for novice financial investors. Finally, it presents a model to represent both the domain knowledge of the tutor and the student.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129245798","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685636
S. Miller, A. Berndt, J. Bews, B. McCurdy, W. Kinsner
This paper presents an implementation of a virtual reality (VR) interstitial brachytherapy system, and some results related to the accuracies associated with its use. Brachytherapy is a cancer treatment modality whereby applicators are inserted into the patient to act as channels to deliver radioactive sources to the diseased tissue. There are two major shortcomings associated with current brachytherapy procedures: (i) the lack of visual feedback during the insertion of the applicators leads to suboptimal implants, and in turn to inferior treatments, and (ii) the very lengthy planning component of the treatment. We have constructed a VR prototype in which applicators are inserted into a phantom by a user completely immersed in the virtual world, The virtual world consists of: (i) phantom geometry represented in VR image format, which is aligned with the actual phantom, (ii) an electromagnetic tracking device with two receivers, one attached to the applicators and the other to the user's head, and (iii) a variety of tools to aid the user with the insertion of the applicators. Preliminary results suggest that the tracking device is accurate to approximately 1.5 mm for positional measurements, and 1.0 degree for orientational measurements.
{"title":"An implementation of a virtual reality interstitial brachytherapy system","authors":"S. Miller, A. Berndt, J. Bews, B. McCurdy, W. Kinsner","doi":"10.1109/CCECE.1998.685636","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685636","url":null,"abstract":"This paper presents an implementation of a virtual reality (VR) interstitial brachytherapy system, and some results related to the accuracies associated with its use. Brachytherapy is a cancer treatment modality whereby applicators are inserted into the patient to act as channels to deliver radioactive sources to the diseased tissue. There are two major shortcomings associated with current brachytherapy procedures: (i) the lack of visual feedback during the insertion of the applicators leads to suboptimal implants, and in turn to inferior treatments, and (ii) the very lengthy planning component of the treatment. We have constructed a VR prototype in which applicators are inserted into a phantom by a user completely immersed in the virtual world, The virtual world consists of: (i) phantom geometry represented in VR image format, which is aligned with the actual phantom, (ii) an electromagnetic tracking device with two receivers, one attached to the applicators and the other to the user's head, and (iii) a variety of tools to aid the user with the insertion of the applicators. Preliminary results suggest that the tracking device is accurate to approximately 1.5 mm for positional measurements, and 1.0 degree for orientational measurements.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127710228","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 : 1998-05-24DOI: 10.1109/CCECE.1998.682717
A. Ibrahim, D. Lindenmeyer, T. Niimura, H. Dommel
The Electromagnetic Transients Program (EMTP) is a general purpose computer program for simulating fast transient effects in electric power systems. The application of the EMTP is not easy, because it requires highly specialized expertise. This paper introduces an intelligent system to support EMTP simulation. This intelligent system works in three steps. Initially, the support system selects a base case, from a case data base to be modified to meet the user's requirement. Then, the expert system checks the syntax and validity of the new case data. Finally, the EMTP solution is checked whether it is reasonable. The results evaluation of the EMTP solution is presented in more detail using fuzzy logic. The EMTP expert knowledge is expressed by fuzzy sets in order to check the time domain solution of the EMTP. The simulation results show that the fuzzy logic is suitable to evaluate the results of EMTP.
{"title":"An intelligent support system for results evaluation of electric power system transients analysis","authors":"A. Ibrahim, D. Lindenmeyer, T. Niimura, H. Dommel","doi":"10.1109/CCECE.1998.682717","DOIUrl":"https://doi.org/10.1109/CCECE.1998.682717","url":null,"abstract":"The Electromagnetic Transients Program (EMTP) is a general purpose computer program for simulating fast transient effects in electric power systems. The application of the EMTP is not easy, because it requires highly specialized expertise. This paper introduces an intelligent system to support EMTP simulation. This intelligent system works in three steps. Initially, the support system selects a base case, from a case data base to be modified to meet the user's requirement. Then, the expert system checks the syntax and validity of the new case data. Finally, the EMTP solution is checked whether it is reasonable. The results evaluation of the EMTP solution is presented in more detail using fuzzy logic. The EMTP expert knowledge is expressed by fuzzy sets in order to check the time domain solution of the EMTP. The simulation results show that the fuzzy logic is suitable to evaluate the results of EMTP.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127805101","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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