Pub Date : 1998-05-24DOI: 10.1109/CCECE.1998.685590
K. Yao, D. Koval, Wilsun Xu, J. Salmon
The occurrence of voltage anomalies in the electric delivery system can disrupt the performance of computers and the processes they control. The occurrence of single line to ground faults on the utility's primary lines (i.e., the most frequent type of utility faults) has a significant impact on the voltage magnitude and phase angle as seen by all the customers connected to the primary circuit. The type of transformer connection (e.g., wye ungrounded-delta) linking a customer to the primary circuit alters the primary voltage sags during primary circuit faults that seen at the customers service entrance. This paper presents the phase and line-to-line voltage sag basic equations for an ungrounded-delta transformer connection due to primary distribution single line phase faults. The basic equations presented provide the framework for evaluating the voltage sags for nine different transformer connections. The significant impact of grounded and ungrounded transformer connections on the magnitude and phase angle of the primary and secondary phase and line voltages are revealed.
{"title":"An investigation of voltage sags by a phasor methodology","authors":"K. Yao, D. Koval, Wilsun Xu, J. Salmon","doi":"10.1109/CCECE.1998.685590","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685590","url":null,"abstract":"The occurrence of voltage anomalies in the electric delivery system can disrupt the performance of computers and the processes they control. The occurrence of single line to ground faults on the utility's primary lines (i.e., the most frequent type of utility faults) has a significant impact on the voltage magnitude and phase angle as seen by all the customers connected to the primary circuit. The type of transformer connection (e.g., wye ungrounded-delta) linking a customer to the primary circuit alters the primary voltage sags during primary circuit faults that seen at the customers service entrance. This paper presents the phase and line-to-line voltage sag basic equations for an ungrounded-delta transformer connection due to primary distribution single line phase faults. The basic equations presented provide the framework for evaluating the voltage sags for nine different transformer connections. The significant impact of grounded and ungrounded transformer connections on the magnitude and phase angle of the primary and secondary phase and line voltages are revealed.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"1 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":"130890359","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.1998.682719
L.H. Arendt
Certain real-time power systems simulation applications running on parallel architectures are characterized by bursty broadcast traffic, making them ideal candidates for reflective memory networks (RMN) based on cache-coherent cache-only memory access (CC-COMA) type of schemes. We present a minimalist, scalable, and high performance RMN interface controller suitable for such applications.
{"title":"A simple, high speed, low latency reflective memory network for parallel processing systems","authors":"L.H. Arendt","doi":"10.1109/CCECE.1998.682719","DOIUrl":"https://doi.org/10.1109/CCECE.1998.682719","url":null,"abstract":"Certain real-time power systems simulation applications running on parallel architectures are characterized by bursty broadcast traffic, making them ideal candidates for reflective memory networks (RMN) based on cache-coherent cache-only memory access (CC-COMA) type of schemes. We present a minimalist, scalable, and high performance RMN interface controller suitable for such applications.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"199 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":"134496999","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.1998.685599
J. Xu, Z. Yao, V. Rajagopalan
Heating by induction causes interference by electromagnetic and thermal phenomenon. The modelling of the problem is based on Maxwell's equations and the equation of heat. This article presents a method of numerical simulation coupling the calculation of physical process evolving in the material in the course of heating. An algorithm for indirect coupling is developed for resolving the problem of calculation time important for a big agreement between the thermal and electric constants. This method is implemented for the 2D case in the MATLAB environment and utilises the tools in the PDE block. An example application is illustrated by the modelling and simulation of reheating of an aluminium billet.
{"title":"Modelling and simulation of magneto-thermal coupling of induction heating processes","authors":"J. Xu, Z. Yao, V. Rajagopalan","doi":"10.1109/CCECE.1998.685599","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685599","url":null,"abstract":"Heating by induction causes interference by electromagnetic and thermal phenomenon. The modelling of the problem is based on Maxwell's equations and the equation of heat. This article presents a method of numerical simulation coupling the calculation of physical process evolving in the material in the course of heating. An algorithm for indirect coupling is developed for resolving the problem of calculation time important for a big agreement between the thermal and electric constants. This method is implemented for the 2D case in the MATLAB environment and utilises the tools in the PDE block. An example application is illustrated by the modelling and simulation of reheating of an aluminium billet.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"2 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":"131005285","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.1998.685578
L. Sylla, P. Fortier
In this paper, we present simulation results for a system combining turbo codes and multilevel modulation. This scheme is shown to be an excellent solution when it comes to transmission over bandlimited channels. Its performance in mobile radio channels can be improved using OFDM.
{"title":"A study of turbo codes for multilevel modulations in Gaussian and mobile channels","authors":"L. Sylla, P. Fortier","doi":"10.1109/CCECE.1998.685578","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685578","url":null,"abstract":"In this paper, we present simulation results for a system combining turbo codes and multilevel modulation. This scheme is shown to be an excellent solution when it comes to transmission over bandlimited channels. Its performance in mobile radio channels can be improved using OFDM.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"67 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":"134397318","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.1998.682709
O. Elbadawy, M. El-Sakka, M. Kamel
Lossy image compression techniques aim at encoding images with a minimal representation. During this process, some visually useful information may be lost. Assessing the information loss in decompressed images is not an easy task. In this paper, a new quantitative image-quality measure is introduced. This new measure incorporates information theory into the most commonly used objective criterion (the mean square error). The new measure has been tested by experiments performed on a wide variety of images. The results show an increase in the correlation between subjective rating by human observers and the normalized mean square error after applying the new measure.
{"title":"An information theoretic image-quality measure","authors":"O. Elbadawy, M. El-Sakka, M. Kamel","doi":"10.1109/CCECE.1998.682709","DOIUrl":"https://doi.org/10.1109/CCECE.1998.682709","url":null,"abstract":"Lossy image compression techniques aim at encoding images with a minimal representation. During this process, some visually useful information may be lost. Assessing the information loss in decompressed images is not an easy task. In this paper, a new quantitative image-quality measure is introduced. This new measure incorporates information theory into the most commonly used objective criterion (the mean square error). The new measure has been tested by experiments performed on a wide variety of images. The results show an increase in the correlation between subjective rating by human observers and the normalized mean square error after applying the new measure.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"180 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":"132065991","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.1998.682743
M. Ouhrouche, S. Lefebvre, X. Do
The vector control method allows high performance control of torque and speed to be achieved from an induction machine. The decoupling of the flux and the electromagnetic torque, obtained by field orientation, depends on the precision and the accuracy of the estimated states. This paper presents the application of the extended Kalman filter (EKF) to the online estimation of the rotor resistance, electrical speed and flux components. The EKF algorithm combines information from the process or the plant model with output measurements to produce an optimal estimate of the unmeasured states. The estimation of the rotor speed allows the implementation of sensorless control.
{"title":"Application of an extended Kalman filter to rotor speed and resistance estimation in induction motor vector control","authors":"M. Ouhrouche, S. Lefebvre, X. Do","doi":"10.1109/CCECE.1998.682743","DOIUrl":"https://doi.org/10.1109/CCECE.1998.682743","url":null,"abstract":"The vector control method allows high performance control of torque and speed to be achieved from an induction machine. The decoupling of the flux and the electromagnetic torque, obtained by field orientation, depends on the precision and the accuracy of the estimated states. This paper presents the application of the extended Kalman filter (EKF) to the online estimation of the rotor resistance, electrical speed and flux components. The EKF algorithm combines information from the process or the plant model with output measurements to produce an optimal estimate of the unmeasured states. The estimation of the rotor speed allows the implementation of sensorless control.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"28 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":"133750143","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.1998.685605
M. El-Tarhuni, A. Sheikh
The capacity of a DS/CDMA system is essentially limited by the performance of the acquisition sub-system; i.e. the maximum number of users that can achieve signal acquisition with a certain degree of reliability. This paper presents a new code acquisition scheme utilizing an FIR adaptive filter that significantly outperforms matched filter based schemes. It is shown that the proposed scheme can achieve the same capacity obtained from the BER criterion.
{"title":"PN code acquisition in CDMA systems using a MMSE adaptive filter","authors":"M. El-Tarhuni, A. Sheikh","doi":"10.1109/CCECE.1998.685605","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685605","url":null,"abstract":"The capacity of a DS/CDMA system is essentially limited by the performance of the acquisition sub-system; i.e. the maximum number of users that can achieve signal acquisition with a certain degree of reliability. This paper presents a new code acquisition scheme utilizing an FIR adaptive filter that significantly outperforms matched filter based schemes. It is shown that the proposed scheme can achieve the same capacity obtained from the BER criterion.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"60 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":"133052277","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.1998.685580
E. Fox, N. O, D. Dykaar, T.J. Mantell, R. W. Sabila
In this work we describe two families of linear image sensors which incorporate pinned photodiode (PPD) photosites. In a PPD photosite the n/sup +/ region of the conventional photodiode is replaced by an n region and a shallow highly doped p region. The high quantum efficiencies associated with conventional photodiodes are maintained while allowing for large reductions in image lag and fixed pattern noise which are associated with conventional photodiodes.
{"title":"High speed linear CCD sensors with pinned photodiode photosites","authors":"E. Fox, N. O, D. Dykaar, T.J. Mantell, R. W. Sabila","doi":"10.1109/CCECE.1998.685580","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685580","url":null,"abstract":"In this work we describe two families of linear image sensors which incorporate pinned photodiode (PPD) photosites. In a PPD photosite the n/sup +/ region of the conventional photodiode is replaced by an n region and a shallow highly doped p region. The high quantum efficiencies associated with conventional photodiodes are maintained while allowing for large reductions in image lag and fixed pattern noise which are associated with conventional photodiodes.","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":"133107975","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.1998.685582
H. H. Pham, A. Nathan
We report a randomized scheme for generating Gauss quadratures for an exponential integral representation of the Green's function /sup 1///sub r/. These Gauss quadratures form the basis of the exponential-expansion-based method, which has previously been developed for rapid and accurate evaluation of the potential field and its gradient in three dimensions. Given a desired degree of accuracy on the approximation of /sup 1///sub r/, the technique proposed here enables generation of exponential expansion with sizes as small as possible. It makes use of the standard Legendre-Gauss and Chebychev-Gauss quadratures, and does not require solving a large system of non-linear equations.
{"title":"Generating Gauss quadratures for Green's function /sup 1///sub r/: a randomized algorithm","authors":"H. H. Pham, A. Nathan","doi":"10.1109/CCECE.1998.685582","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685582","url":null,"abstract":"We report a randomized scheme for generating Gauss quadratures for an exponential integral representation of the Green's function /sup 1///sub r/. These Gauss quadratures form the basis of the exponential-expansion-based method, which has previously been developed for rapid and accurate evaluation of the potential field and its gradient in three dimensions. Given a desired degree of accuracy on the approximation of /sup 1///sub r/, the technique proposed here enables generation of exponential expansion with sizes as small as possible. It makes use of the standard Legendre-Gauss and Chebychev-Gauss quadratures, and does not require solving a large system of non-linear equations.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"7 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":"130087057","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.1998.685551
Beilei Huang, A. Karmouch
This paper discusses the improved interactivity in a multimedia telelearning system over the Internet. Three levels of interactions are considered with the emphasis on the interaction between the end-user and the document. An interaction engine is designed to achieve the pre-defined interactions on this level. The techniques of the implementation on the interaction engine are presented.
{"title":"Enhanced interactivity in a multimedia system over Internet","authors":"Beilei Huang, A. Karmouch","doi":"10.1109/CCECE.1998.685551","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685551","url":null,"abstract":"This paper discusses the improved interactivity in a multimedia telelearning system over the Internet. Three levels of interactions are considered with the emphasis on the interaction between the end-user and the document. An interaction engine is designed to achieve the pre-defined interactions on this level. The techniques of the implementation on the interaction engine are presented.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"70 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":"132133734","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：