Pub Date : 2004-09-05DOI: 10.1109/ICEEC.2004.1374501
N. Mahmoud, M. Dessouky
In this paper, we present a new analog design methodology for analog cells using MTLAB. This method has the advantage of accelerating the design cycle by automating the biasing stage of the design and focusing on design parameters and tradeoffs. Two design examples for folded cascode and Miller OTA 's is presented as an application of the new procedure.
{"title":"Analog design methodology using MATLAIB","authors":"N. Mahmoud, M. Dessouky","doi":"10.1109/ICEEC.2004.1374501","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374501","url":null,"abstract":"In this paper, we present a new analog design methodology for analog cells using MTLAB. This method has the advantage of accelerating the design cycle by automating the biasing stage of the design and focusing on design parameters and tradeoffs. Two design examples for folded cascode and Miller OTA 's is presented as an application of the new procedure.","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115284495","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 : 2004-09-05DOI: 10.1109/ICEEC.2004.1374458
M. Gomaa
Industrial process fault tolerant control (FTC) aims at maintaining the process operating conditions, upon fault occurrence, as much as possible, until scheduled fault isolation procedure is carried out. This paper proposes a FTC scheme based on the employment of multi arti>cial neural networks as process faulty models, and the introduction of compensation paths, using ANNs, to enhance operating conditions recuperation. The proposed scheme is applied to a non-linear simulation model and the advantage of this FTC is illustrated via simulation results. Key wordsArtiJicial Neural Network, Fault Tolerant Control, Genetic Algorithms, Fault Detection and Diagnosis, Modeling, Simulation.
{"title":"Fault tolerant control scheme based on multi-ann faulty models","authors":"M. Gomaa","doi":"10.1109/ICEEC.2004.1374458","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374458","url":null,"abstract":"Industrial process fault tolerant control (FTC) aims at maintaining the process operating conditions, upon fault occurrence, as much as possible, until scheduled fault isolation procedure is carried out. This paper proposes a FTC scheme based on the employment of multi arti>cial neural networks as process faulty models, and the introduction of compensation paths, using ANNs, to enhance operating conditions recuperation. The proposed scheme is applied to a non-linear simulation model and the advantage of this FTC is illustrated via simulation results. Key wordsArtiJicial Neural Network, Fault Tolerant Control, Genetic Algorithms, Fault Detection and Diagnosis, Modeling, Simulation.","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115695374","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 : 2004-09-05DOI: 10.1109/ICEEC.2004.1374620
A. Amer
The application of controlled reactive power compensators in electric distribution networks, whether for power factor improvement, losses reduction, voltage control or released capacity has been accepted as a necessary step in the design of distribution systems. The operation of such equipment necessitate the switching on and off of steps of capacitor banks. Such switching procedure are normally accompanied by transient over current and transient over voltages This paper presents the results of studies of transient over voltages in electric distribution networks due to the installation of switched capacitor banks on the secondary side of primary substations. Transient over voltages due to the switching off steps of the capacitor banks are obtained for both the primary and the secondary sides of the primary substations. The results obtained give an explanation for the problem of terminations failure on the high voltage side of the primary substation. The study is very helpful for manufacturers, operators and planners, for the suitable choice of equipment type, size and steps of capacitor banks.
{"title":"Transient over voltages in electric distribution networks due to switching of capacitor banks steps","authors":"A. Amer","doi":"10.1109/ICEEC.2004.1374620","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374620","url":null,"abstract":"The application of controlled reactive power compensators in electric distribution networks, whether for power factor improvement, losses reduction, voltage control or released capacity has been accepted as a necessary step in the design of distribution systems. The operation of such equipment necessitate the switching on and off of steps of capacitor banks. Such switching procedure are normally accompanied by transient over current and transient over voltages This paper presents the results of studies of transient over voltages in electric distribution networks due to the installation of switched capacitor banks on the secondary side of primary substations. Transient over voltages due to the switching off steps of the capacitor banks are obtained for both the primary and the secondary sides of the primary substations. The results obtained give an explanation for the problem of terminations failure on the high voltage side of the primary substation. The study is very helpful for manufacturers, operators and planners, for the suitable choice of equipment type, size and steps of capacitor banks.","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123040826","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 : 2004-09-05DOI: 10.1109/ICEEC.2004.1374545
Ahmed E. El-Mahdy, Armed Forces
The paper presents an adaptive equalizer for fast frequency selective fading channels under class-A impulsive noise environment. The equalizer is based on the principals of Maximum Likelihood sequence estimator (MLSE) and employs the minimum survivor processing approach to obtain a reliable data. The channel impulse response is expanded onto a set of basis sequences and a time invariant (TI) expansion parameters. The proposed equalizer continuously estimates the time invariant expansion parameters directly within the metric calculation of the Viterbi algorithm (VA). The pegormance of the proposed equalizer is evaluated in terms of the symbol error probability and compared to other equalizers.
{"title":"Equalization for fast time varying frequency selective fading channel under class-a impulsive noise","authors":"Ahmed E. El-Mahdy, Armed Forces","doi":"10.1109/ICEEC.2004.1374545","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374545","url":null,"abstract":"The paper presents an adaptive equalizer for fast frequency selective fading channels under class-A impulsive noise environment. The equalizer is based on the principals of Maximum Likelihood sequence estimator (MLSE) and employs the minimum survivor processing approach to obtain a reliable data. The channel impulse response is expanded onto a set of basis sequences and a time invariant (TI) expansion parameters. The proposed equalizer continuously estimates the time invariant expansion parameters directly within the metric calculation of the Viterbi algorithm (VA). The pegormance of the proposed equalizer is evaluated in terms of the symbol error probability and compared to other equalizers.","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126097617","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 : 2004-09-05DOI: 10.1109/ICEEC.2004.1374547
M. Nabil, M. M. Zahra
In this paper an algorithm, called Multilayer Dynamic Channel Management scheme (ML-DCM) is proposed to reallocate channels in a hierarchical cellular network. This proposed algorithm is based on reducing the dropping handofs and on balancing load between microcells and overlaying macrocell. A continuous coverage is achieved with microcells that accommodate both new and handoff requests. Macrocell (Umbrella cells) only accept handoff requests. The strategy of this contribution tends to favor (prioritize) handoff calls to macrocell for high-speed users. This system is analysed using simulation. KeywordsHierarchical cellular network, cell selection policy, handoff calls.
{"title":"Dynamic channels reallocation management scheme in hierarchical cellular network","authors":"M. Nabil, M. M. Zahra","doi":"10.1109/ICEEC.2004.1374547","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374547","url":null,"abstract":"In this paper an algorithm, called Multilayer Dynamic Channel Management scheme (ML-DCM) is proposed to reallocate channels in a hierarchical cellular network. This proposed algorithm is based on reducing the dropping handofs and on balancing load between microcells and overlaying macrocell. A continuous coverage is achieved with microcells that accommodate both new and handoff requests. Macrocell (Umbrella cells) only accept handoff requests. The strategy of this contribution tends to favor (prioritize) handoff calls to macrocell for high-speed users. This system is analysed using simulation. KeywordsHierarchical cellular network, cell selection policy, handoff calls.","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123796709","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 : 2004-09-05DOI: 10.1109/ICEEC.2004.1374473
W. Gharieb
This paper presents an integrated control approach for discrete event systems in industry. The integrated control involves two levels: basic control functions (PLC level) and higher supervision (SCADA Level). The considered discrete event system consists of three main groups: a chain of conveyors and a moving carriage to charge the tobacco material into silos (charging group), set of silos for temporary storage (silos group), and a chain of conveyors to discharge the material (discharging group). The system is analyzed using a sequential function chart (Grafcet tool) and discrete models are developed for both PLC level and SCADA level. Based on the developed model, a new control panel is designed using a PLC. The developed system is equipped by an industrial PC to visualize the industrial operation and to make the operator interact easily with the controlled system. The new system has the advantages of: high reliability in function operation, minimal downtime, and fault diagnosis capability in system components. The system is tested in applying standard commissioning procedures to ensure the quality and safety operation for the developed control panel. This application is running successfully and the required control objectives are maintained .
{"title":"Integrated control for discrete event systems","authors":"W. Gharieb","doi":"10.1109/ICEEC.2004.1374473","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374473","url":null,"abstract":"This paper presents an integrated control approach for discrete event systems in industry. The integrated control involves two levels: basic control functions (PLC level) and higher supervision (SCADA Level). The considered discrete event system consists of three main groups: a chain of conveyors and a moving carriage to charge the tobacco material into silos (charging group), set of silos for temporary storage (silos group), and a chain of conveyors to discharge the material (discharging group). The system is analyzed using a sequential function chart (Grafcet tool) and discrete models are developed for both PLC level and SCADA level. Based on the developed model, a new control panel is designed using a PLC. The developed system is equipped by an industrial PC to visualize the industrial operation and to make the operator interact easily with the controlled system. The new system has the advantages of: high reliability in function operation, minimal downtime, and fault diagnosis capability in system components. The system is tested in applying standard commissioning procedures to ensure the quality and safety operation for the developed control panel. This application is running successfully and the required control objectives are maintained .","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125572821","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 : 2004-09-05DOI: 10.1109/ICEEC.2004.1374555
A. Yehia, D. Khalil
In this work, we present the 2 0 MMI PHASAR (de)multiplexer as a new multilevel integrated optical circuit, which is compatible with the planar integrated optics technologv, opening the door for new high-density integrated optical circuits. The simulations show that a 35 channel 2 0 MMI PHASAR (de)multiplexer with a channel spacing of 0.4nm would result in a great size reduction compared to its planar counterpart. A specijk design with an insertion loss of 1.3 dB and a 3dB bandwidth of 0.25nm is presented.
{"title":"Towards multilevel integrated optics: the two-dimensional multimode interference PHASAR","authors":"A. Yehia, D. Khalil","doi":"10.1109/ICEEC.2004.1374555","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374555","url":null,"abstract":"In this work, we present the 2 0 MMI PHASAR (de)multiplexer as a new multilevel integrated optical circuit, which is compatible with the planar integrated optics technologv, opening the door for new high-density integrated optical circuits. The simulations show that a 35 channel 2 0 MMI PHASAR (de)multiplexer with a channel spacing of 0.4nm would result in a great size reduction compared to its planar counterpart. A specijk design with an insertion loss of 1.3 dB and a 3dB bandwidth of 0.25nm is presented.","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115195143","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 : 2004-09-05DOI: 10.1109/ICEEC.2004.1374614
M. El-Sadek, G. Shabib, M. R. Ghallab
This paper presents a new method for designing the parameters of harmonic filters used with large distorting loads . It proposes using shunt filters which composed of groups of single tuned harmonic filters .The design takes into consideration as minimum as possible values of capacitors capacitance, and the avoidance of parallel resonance and considers the filter elements deviations from their adjusted values at the designed filters harmonic orders. It presents new concepts for capacitance division among shunt filters.
{"title":"Criteria for dividing capacitors among shunt harmonic filters for large harmonic sources","authors":"M. El-Sadek, G. Shabib, M. R. Ghallab","doi":"10.1109/ICEEC.2004.1374614","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374614","url":null,"abstract":"This paper presents a new method for designing the parameters of harmonic filters used with large distorting loads . It proposes using shunt filters which composed of groups of single tuned harmonic filters .The design takes into consideration as minimum as possible values of capacitors capacitance, and the avoidance of parallel resonance and considers the filter elements deviations from their adjusted values at the designed filters harmonic orders. It presents new concepts for capacitance division among shunt filters.","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114408676","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 : 2004-09-05DOI: 10.1109/ICEEC.2004.1374618
M. Abouelsaad, I.M. El Shair, E. F. Ghariany
Electric field intensity and ion current density at the ground level of HVDC power lines are significant electrical environment parameters in relation to biological effects. These quantities, largely, depend on the line geometry and meteorological conditions. In order to make a reliable predetermination of the electric field intensity and ion current density, the paper presents detailed numerical assessment of these quantities on a full scale line. The governing equations are solved using an iterative algorithm. Factors influencing the ionized field quantities, namely, the wind speed, the line sag, the conductor surface gradient, are accounted for both individually and collectively and the interactions between them is established. Results and discussion are presented.
{"title":"Numerical assessment of ionized fields under HVDC lines","authors":"M. Abouelsaad, I.M. El Shair, E. F. Ghariany","doi":"10.1109/ICEEC.2004.1374618","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374618","url":null,"abstract":"Electric field intensity and ion current density at the ground level of HVDC power lines are significant electrical environment parameters in relation to biological effects. These quantities, largely, depend on the line geometry and meteorological conditions. In order to make a reliable predetermination of the electric field intensity and ion current density, the paper presents detailed numerical assessment of these quantities on a full scale line. The governing equations are solved using an iterative algorithm. Factors influencing the ionized field quantities, namely, the wind speed, the line sag, the conductor surface gradient, are accounted for both individually and collectively and the interactions between them is established. Results and discussion are presented.","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122208458","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 : 2004-09-05DOI: 10.1109/ICEEC.2004.1374600
J.M. Grellier
Protection relays of the Ultra High Voltage grid systems were built with electronic components since the years 1975. Afer 30 years in service, some components present ageing problems : the failure modes, unknown when the design has been done, caused some incidents on the grid systems. An organization method is proposed to put under control these risks. The analyses of the functional chains were carried out on protections, the trips of which have the greatest impacts f l y the number and functionality), in order to connect the principal component failures with their consequences on grid system operation. Simple measurements are proposed, as well as research ways on the phenomena causing these ageings.
{"title":"Getting under control the ageing of static protection relays","authors":"J.M. Grellier","doi":"10.1109/ICEEC.2004.1374600","DOIUrl":"https://doi.org/10.1109/ICEEC.2004.1374600","url":null,"abstract":"Protection relays of the Ultra High Voltage grid systems were built with electronic components since the years 1975. Afer 30 years in service, some components present ageing problems : the failure modes, unknown when the design has been done, caused some incidents on the grid systems. An organization method is proposed to put under control these risks. The analyses of the functional chains were carried out on protections, the trips of which have the greatest impacts f l y the number and functionality), in order to connect the principal component failures with their consequences on grid system operation. Simple measurements are proposed, as well as research ways on the phenomena causing these ageings.","PeriodicalId":180043,"journal":{"name":"International Conference on Electrical, Electronic and Computer Engineering, 2004. ICEEC '04.","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128234591","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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