Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.528073
A. Ibrahim, M. Salama
In electromagnetic transients studies, only a small part of an AC power system can be modeled in detail. The remaining parts of the system should be reduced to the equivalent model. Different methods were developed to generate frequency dependent network equivalent (FDNE) models. These FDNE models consist of simple R, L, and C branches that reproduce the impedance frequency characteristic of the original system. A FDNE model for AC power systems using the QZ algorithm is proposed in this paper. The QZ algorithm obtains accurate resonance frequencies directly from the system equations to be used for finding the FDNE model parameters.
{"title":"Frequency dependent network equivalent for AC power systems using the QZ algorithm","authors":"A. Ibrahim, M. Salama","doi":"10.1109/CCECE.1995.528073","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528073","url":null,"abstract":"In electromagnetic transients studies, only a small part of an AC power system can be modeled in detail. The remaining parts of the system should be reduced to the equivalent model. Different methods were developed to generate frequency dependent network equivalent (FDNE) models. These FDNE models consist of simple R, L, and C branches that reproduce the impedance frequency characteristic of the original system. A FDNE model for AC power systems using the QZ algorithm is proposed in this paper. The QZ algorithm obtains accurate resonance frequencies directly from the system equations to be used for finding the FDNE model parameters.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"91 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":"129013214","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.1995.526571
Yansheng Xu, R. Bosisio
A study of general bi-anisotropic waveguides by using coupled-mode analysis is presented. A simplified method to obtain rigorous expressions of the coupled coefficients for general bi-anisotropic waveguides is given and the solutions of the coupled-mode equations are demonstrated. Applications to chiral and Faraday chiral waveguides are also shown.
{"title":"An efficient approach for calculation of general bi-anisotropic waveguides","authors":"Yansheng Xu, R. Bosisio","doi":"10.1109/CCECE.1995.526571","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526571","url":null,"abstract":"A study of general bi-anisotropic waveguides by using coupled-mode analysis is presented. A simplified method to obtain rigorous expressions of the coupled coefficients for general bi-anisotropic waveguides is given and the solutions of the coupled-mode equations are demonstrated. Applications to chiral and Faraday chiral waveguides are also shown.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"470 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":"116218086","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.1995.528148
L. Sandu, J. Oksman
The problems of nondestructive testing are often associated with techniques for solving inverse problems. In this regard the authors have developed a method of characterisation of the internal temperature of a combustion chamber. Having very few measurements available for the application, they have opted for a parametric approach. Its advantage resides in its simplicity, involving only two or three measurements and affording very rapid calculation of the temperature profile.
{"title":"Parametric inversion: application to measurement of temperature of a combustion chamber","authors":"L. Sandu, J. Oksman","doi":"10.1109/CCECE.1995.528148","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528148","url":null,"abstract":"The problems of nondestructive testing are often associated with techniques for solving inverse problems. In this regard the authors have developed a method of characterisation of the internal temperature of a combustion chamber. Having very few measurements available for the application, they have opted for a parametric approach. Its advantage resides in its simplicity, involving only two or three measurements and affording very rapid calculation of the temperature profile.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"54 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":"116351296","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.1995.528197
M. El-Tanany, G. K. Chan, H. Hafez
This paper presents a set of detailed analytical models which are applicable to several types of radio transceivers, and discusses their application in the computations of interference as a function of the frequency displacement between the interfering transmitter and the victim receiver. The subject of this paper is motivated by the necessity of sharing the limited radio spectrum resources by a growing number of radio services, and an ever increasing number of users within each service. For example, the recent North American decision regarding spectral allocations for PCS services call for the deployment of new PCS services in frequency bands that are currently occupied by fixed microwave services. The steadily increased demand on the radio spectrum is bound to create other scenarios similar to the PCS/fixed microwave example, and will eventually lead to an intense interference environment within which old and new services must co-exist. An accurate modelling and computation of interference levels in such an environment is important.
{"title":"Intersystem interference modelling for land mobile systems","authors":"M. El-Tanany, G. K. Chan, H. Hafez","doi":"10.1109/CCECE.1995.528197","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528197","url":null,"abstract":"This paper presents a set of detailed analytical models which are applicable to several types of radio transceivers, and discusses their application in the computations of interference as a function of the frequency displacement between the interfering transmitter and the victim receiver. The subject of this paper is motivated by the necessity of sharing the limited radio spectrum resources by a growing number of radio services, and an ever increasing number of users within each service. For example, the recent North American decision regarding spectral allocations for PCS services call for the deployment of new PCS services in frequency bands that are currently occupied by fixed microwave services. The steadily increased demand on the radio spectrum is bound to create other scenarios similar to the PCS/fixed microwave example, and will eventually lead to an intense interference environment within which old and new services must co-exist. An accurate modelling and computation of interference levels in such an environment is important.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"288 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":"113968973","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.1995.526601
A. Torabian-Esfahani, Y. Chow
With high Q circuits, say Q=1000, one requires an analysis that is accurate to 0.1%. The paper presents a new method to analyse high Q circuits very quickly and accurately. This method is a combination of an analytical method for planar circuits and a numerical moment method, and is of interest for high temperature superconducting devices.
{"title":"A fast and accurate analysis of high Q patch resonators","authors":"A. Torabian-Esfahani, Y. Chow","doi":"10.1109/CCECE.1995.526601","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526601","url":null,"abstract":"With high Q circuits, say Q=1000, one requires an analysis that is accurate to 0.1%. The paper presents a new method to analyse high Q circuits very quickly and accurately. This method is a combination of an analytical method for planar circuits and a numerical moment method, and is of interest for high temperature superconducting devices.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"60 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":"122012924","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.1995.528065
David E. Dodds, Michael Moher
This paper investigates required signal structure and receiver code synchronization techniques for satellite based CDMA personal communications systems. A signal structure is proposed in which different CDMA codes are used to differentiate each satellite (as in the GPS system) and different phases of one code (as in the IS-95 standard) to differentiate spot beams on one satellite. Due to satellite overlap, the number of effective co-users in each cell can be two or three times the number of actual cell users which leads to a required spreading gain in the order of 20 times the actual number of cell users. The paper investigates correlator receiver structures and shows that the optimum correlation time is 400-1000 chips when the number of effective co-users is 100.
{"title":"Spread spectrum synchronization for a LEO personal communications satellite system","authors":"David E. Dodds, Michael Moher","doi":"10.1109/CCECE.1995.528065","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528065","url":null,"abstract":"This paper investigates required signal structure and receiver code synchronization techniques for satellite based CDMA personal communications systems. A signal structure is proposed in which different CDMA codes are used to differentiate each satellite (as in the GPS system) and different phases of one code (as in the IS-95 standard) to differentiate spot beams on one satellite. Due to satellite overlap, the number of effective co-users in each cell can be two or three times the number of actual cell users which leads to a required spreading gain in the order of 20 times the actual number of cell users. The paper investigates correlator receiver structures and shows that the optimum correlation time is 400-1000 chips when the number of effective co-users is 100.","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":"127902721","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.1995.526422
D. Lequang, A. Zaccarin
Object-oriented approaches have been proposed for coding video sequences at very low bit rate. Typically, object-oriented coding algorithms segment each image into regions of uniform motion and estimate motion of these regions to generate more accurate motion compensated images. Due to the iterative computing of complex motion models' parameters, the computational complexity of object-oriented algorithms is often high. The present author gives a two-stage algorithm for motion field segmentation and estimation in an object-oriented coder whose computational complexity is reduced by delaying the use of complex motion models at the end of the proposed algorithm. In the first stage of the algorithm, a standard block-matching algorithm and a maximum a posteriori probability estimate are used to compute a translational motion field and its segmentation. That segmentation is then utilized in the second stage to estimate the parameters of complex motion models. Compared to standard block-based algorithms, simulation results show that the proposed algorithm significantly reduces the bit rate needed to encode video sequences and is appropriate for very low bit rate applications.
{"title":"A new object-oriented approach for video compression at very low bit rate","authors":"D. Lequang, A. Zaccarin","doi":"10.1109/CCECE.1995.526422","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526422","url":null,"abstract":"Object-oriented approaches have been proposed for coding video sequences at very low bit rate. Typically, object-oriented coding algorithms segment each image into regions of uniform motion and estimate motion of these regions to generate more accurate motion compensated images. Due to the iterative computing of complex motion models' parameters, the computational complexity of object-oriented algorithms is often high. The present author gives a two-stage algorithm for motion field segmentation and estimation in an object-oriented coder whose computational complexity is reduced by delaying the use of complex motion models at the end of the proposed algorithm. In the first stage of the algorithm, a standard block-matching algorithm and a maximum a posteriori probability estimate are used to compute a translational motion field and its segmentation. That segmentation is then utilized in the second stage to estimate the parameters of complex motion models. Compared to standard block-based algorithms, simulation results show that the proposed algorithm significantly reduces the bit rate needed to encode video sequences and is appropriate for very low bit rate applications.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"74 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":"121681653","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.1995.528087
S. Huq, M. Stevenson
In the design of a dedicated neural network, the number of precision levels used in the hardware circuitry to store weight values is an important consideration as it will impact the functionality and hence the performance of the neural network. One measure of the functionality is the number of training set examples required to achieve perfect generalization. In this paper, we experimentally determine the training set size required for the threshold Adaline (adaptive linear element) with various levels of weight precision to achieve perfect generalization. In all cases, it was found that the training set size required for the perfect generalization was proportional to the number of weights; for the binary, ternary, and 5-ary Adalines, the constants of the proportionality were found to be 1.36, 2.5, and 4.85 respectively.
{"title":"The effect of limited-precision weights on the perfect generalization requirements for threshold Adalines","authors":"S. Huq, M. Stevenson","doi":"10.1109/CCECE.1995.528087","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528087","url":null,"abstract":"In the design of a dedicated neural network, the number of precision levels used in the hardware circuitry to store weight values is an important consideration as it will impact the functionality and hence the performance of the neural network. One measure of the functionality is the number of training set examples required to achieve perfect generalization. In this paper, we experimentally determine the training set size required for the threshold Adaline (adaptive linear element) with various levels of weight precision to achieve perfect generalization. In all cases, it was found that the training set size required for the perfect generalization was proportional to the number of weights; for the binary, ternary, and 5-ary Adalines, the constants of the proportionality were found to be 1.36, 2.5, and 4.85 respectively.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"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":"132065310","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.1995.528114
K. Raahemifar, S. Hessabi, M. Elmasry
The paper provides the results of a simulation-based fault characterization study of BiCMOS logic families. The author shows that most of the shorts cause I/sub DDQ/ faults, while open defects result in delay or stuck-open faults. The author proposes a design-for-testability technique for detecting short and bridging faults in CMOS/BiCMOS logic circuits. The impact of this circuit modification on the behavior of the circuit in normal mode is investigated.
{"title":"A design for-testability technique for shorts and bridging faults in BiCMOS logic families","authors":"K. Raahemifar, S. Hessabi, M. Elmasry","doi":"10.1109/CCECE.1995.528114","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528114","url":null,"abstract":"The paper provides the results of a simulation-based fault characterization study of BiCMOS logic families. The author shows that most of the shorts cause I/sub DDQ/ faults, while open defects result in delay or stuck-open faults. The author proposes a design-for-testability technique for detecting short and bridging faults in CMOS/BiCMOS logic circuits. The impact of this circuit modification on the behavior of the circuit in normal mode is investigated.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"81 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":"132471446","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.1995.528189
I. Larchie, S. T. Nugent, J. Finley
The baroreflex control system is inherently nonlinear. Clinical measurements which rely on linear models provide adequate representation of the system as long as the input perturbations to the reflex loop are small and fall within the linear region of the response curve. The authors propose a novel technique that combines approximation power of a class of artificial neural networks (ANNs), Volterra nonlinear block representation and eigen-analysis to provide estimates of the open-loop gain of the baroreflex. A range of eigen-parameters are extracted from the converged weight matrices of the ANN to provide a range of possible values of the gain factor of simulated baroreflex response curve.
{"title":"Nonlinear open-loop gain of the baroreflex using artificial feedforward neural networks","authors":"I. Larchie, S. T. Nugent, J. Finley","doi":"10.1109/CCECE.1995.528189","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528189","url":null,"abstract":"The baroreflex control system is inherently nonlinear. Clinical measurements which rely on linear models provide adequate representation of the system as long as the input perturbations to the reflex loop are small and fall within the linear region of the response curve. The authors propose a novel technique that combines approximation power of a class of artificial neural networks (ANNs), Volterra nonlinear block representation and eigen-analysis to provide estimates of the open-loop gain of the baroreflex. A range of eigen-parameters are extracted from the converged weight matrices of the ANN to provide a range of possible values of the gain factor of simulated baroreflex response curve.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"33 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":"130440902","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：