Pub Date : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686187
M. Meshkin, K. Faez, H. Abyaneh, H. Kanan
Modelling of Overcurrent (OC) relays with inverse time relay characteristics is a vital job for coordination of these relays. There are many publications in which the OC relay characteristics have been modelled. In this paper a new model based on cascade correlation neural network is proposed. The cascade correlation neural network is used to calculate operating times of OC relays for various Time Dial Settings (TDS) or Time Multiplier Settings (TMS). This method can cover nonlinearity of the characteristic and its accuracy is much higher than the polynomial and the other neural networks models such as perceptron and backpropagation neural networks models. The method is tested on three types of OC relays and the results obtained shows, the accuracy of the new method is higher and therefore it is more useful than the others. The model is validated by comparing the results obtained from the new method with nonlinear analytical, perceptron and backpropagation neural networks models.
{"title":"Application of cascade correlation neural network in modelling of overcurrent relay characteristics","authors":"M. Meshkin, K. Faez, H. Abyaneh, H. Kanan","doi":"10.1109/IEEEGCC.2006.5686187","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686187","url":null,"abstract":"Modelling of Overcurrent (OC) relays with inverse time relay characteristics is a vital job for coordination of these relays. There are many publications in which the OC relay characteristics have been modelled. In this paper a new model based on cascade correlation neural network is proposed. The cascade correlation neural network is used to calculate operating times of OC relays for various Time Dial Settings (TDS) or Time Multiplier Settings (TMS). This method can cover nonlinearity of the characteristic and its accuracy is much higher than the polynomial and the other neural networks models such as perceptron and backpropagation neural networks models. The method is tested on three types of OC relays and the results obtained shows, the accuracy of the new method is higher and therefore it is more useful than the others. The model is validated by comparing the results obtained from the new method with nonlinear analytical, perceptron and backpropagation neural networks models.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125073986","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686207
H. R. Karampoorian, Papi Gh, A. Vahedi, A. Zadehgol
In this paper a new approach for optimization of high frequency transformer design is presented. The presented design method is based on a restatement of the traditional transformer design equations to include non-sinusoidal switching waveforms and high frequency skin and proximity effects. In this optimization procedure both electric and thermal effects in the transformer is considered. Wave form of voltage and current, and maximum acceptable temperature rise, are used as input data. The aim of this procedure is the selection of the smallest core that can deliver desired power, and determination of optimum flux density and current density to reach a transformer with high power density and admissible temperature rise. Since the transformer is the major contributor to the volume and weight of the Power Supply, the results of this transformer analysis can be used for entire power supply optimization as well. Finally the validity of presented method is analyzed.
{"title":"Optimum design of high frequency transformer for compact and light weight switch mode power supplies (SMPS)","authors":"H. R. Karampoorian, Papi Gh, A. Vahedi, A. Zadehgol","doi":"10.1109/IEEEGCC.2006.5686207","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686207","url":null,"abstract":"In this paper a new approach for optimization of high frequency transformer design is presented. The presented design method is based on a restatement of the traditional transformer design equations to include non-sinusoidal switching waveforms and high frequency skin and proximity effects. In this optimization procedure both electric and thermal effects in the transformer is considered. Wave form of voltage and current, and maximum acceptable temperature rise, are used as input data. The aim of this procedure is the selection of the smallest core that can deliver desired power, and determination of optimum flux density and current density to reach a transformer with high power density and admissible temperature rise. Since the transformer is the major contributor to the volume and weight of the Power Supply, the results of this transformer analysis can be used for entire power supply optimization as well. Finally the validity of presented method is analyzed.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115227011","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686216
K. Abedi, V. Ahmadi, M. Moravvej-Farshi, M. Sheikhi, F. Gity
A HSPICE equivalent-circuit model for analyzing the frequency response of segmented traveling wave electroabsorption modulators (STEAM) is presented. The model is based on non-physical model for lossy transmission line. The analysis indicates that STEAM can achieve much wider bandwidth than the lumped electroabsorption modulator (LEAM) and TWEAM counterparts, with a small penalty in E/O conversion gain if low loss passive optical waveguide is available.
{"title":"Non-physical model of lossy transmission line for circuit simulation of segmented traveling wave electroabsorption modulators","authors":"K. Abedi, V. Ahmadi, M. Moravvej-Farshi, M. Sheikhi, F. Gity","doi":"10.1109/IEEEGCC.2006.5686216","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686216","url":null,"abstract":"A HSPICE equivalent-circuit model for analyzing the frequency response of segmented traveling wave electroabsorption modulators (STEAM) is presented. The model is based on non-physical model for lossy transmission line. The analysis indicates that STEAM can achieve much wider bandwidth than the lumped electroabsorption modulator (LEAM) and TWEAM counterparts, with a small penalty in E/O conversion gain if low loss passive optical waveguide is available.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123400211","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686203
A. Bamuqabel, M. A. Abido
In the past two decades, the utilization of supplementary excitation control signals for improving the dynamic stability of power systems has received much attention. In recent years, several approaches based on modern control theory and intelligent control and optimization techniques have been applied to PSS design problem. This paper introduces a review on the techniques applied on the conventional PSS design only. The techniques could be mainly classified into linear and nonlinear. Each classification includes several design methods which make the PSS more effective and robust in damping out the low frequency oscillations.
{"title":"Review of conventional power system stabilizer design methods","authors":"A. Bamuqabel, M. A. Abido","doi":"10.1109/IEEEGCC.2006.5686203","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686203","url":null,"abstract":"In the past two decades, the utilization of supplementary excitation control signals for improving the dynamic stability of power systems has received much attention. In recent years, several approaches based on modern control theory and intelligent control and optimization techniques have been applied to PSS design problem. This paper introduces a review on the techniques applied on the conventional PSS design only. The techniques could be mainly classified into linear and nonlinear. Each classification includes several design methods which make the PSS more effective and robust in damping out the low frequency oscillations.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124208788","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686217
Akram S Bin Sediq, N. Qaddoumi, H. Al-Nashash
In this paper, results of the simulated interaction of microwaves in the near-field region of a waveguide with a fractured Tibia are presented. The Tibia bone fracture is one of the most difficult fractures to treat because of the slow healing process which may take up to 5 months. The human body is modeled as a three layer medium: skin, fasciae with fat, muscle and bone. Each of these layers is characterized by its dielectric properties. These properties influence the incident, transmitted and reflected waves. In this paper, simulation results of Tibia bone healing monitoring using an X-band open ended rectangular waveguide operating in the near-field region at microwave frequencies are presented. An extensive optimization process was performed to arrive at optimal measurement parameters. Frequency of operation and the material that fills the waveguide were investigated to improve the sensitivity of detection and to monitor five different stages of the healing process. Both phase images and radiation patterns show that using rectangular waveguides has great potential in monitoring the healing process of the Tibia bone.
{"title":"Novel near-field microwave bone healing monitoring using open-ended rectangular waveguides","authors":"Akram S Bin Sediq, N. Qaddoumi, H. Al-Nashash","doi":"10.1109/IEEEGCC.2006.5686217","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686217","url":null,"abstract":"In this paper, results of the simulated interaction of microwaves in the near-field region of a waveguide with a fractured Tibia are presented. The Tibia bone fracture is one of the most difficult fractures to treat because of the slow healing process which may take up to 5 months. The human body is modeled as a three layer medium: skin, fasciae with fat, muscle and bone. Each of these layers is characterized by its dielectric properties. These properties influence the incident, transmitted and reflected waves. In this paper, simulation results of Tibia bone healing monitoring using an X-band open ended rectangular waveguide operating in the near-field region at microwave frequencies are presented. An extensive optimization process was performed to arrive at optimal measurement parameters. Frequency of operation and the material that fills the waveguide were investigated to improve the sensitivity of detection and to monitor five different stages of the healing process. Both phase images and radiation patterns show that using rectangular waveguides has great potential in monitoring the healing process of the Tibia bone.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125755704","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686222
R. Yuen, N. F. Xavier
Recent boom in wireless hot-spots has triggered interest in optical fiber based wireless access schemes. An enhanced hot-spot will support both IEEE 802.11 wireless LAN and cellular radio services. Simultaneous transmission of these radio signals over a single radio-over-fiber (ROF) link is possible in a subcar-rier multiplexed manner. However, link design in this multi-system scenario is a complex task. There are number of quality measures such as signal to noise, distortion and interference ratios involved both in the optical link and in the air interface. These are functions of several parameters such as the fiber length, bandwidth, modulation depth, radio cell size and relative RF power of both systems. In this paper we analyze the uplink and show a way to decide the cumulative optical modulation index (μ) and the RF power ratio (T) that will yield the best performance for both systems.
{"title":"Simultaneous delivery of wireless LAN and cellular radio signals over optical fiber","authors":"R. Yuen, N. F. Xavier","doi":"10.1109/IEEEGCC.2006.5686222","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686222","url":null,"abstract":"Recent boom in wireless hot-spots has triggered interest in optical fiber based wireless access schemes. An enhanced hot-spot will support both IEEE 802.11 wireless LAN and cellular radio services. Simultaneous transmission of these radio signals over a single radio-over-fiber (ROF) link is possible in a subcar-rier multiplexed manner. However, link design in this multi-system scenario is a complex task. There are number of quality measures such as signal to noise, distortion and interference ratios involved both in the optical link and in the air interface. These are functions of several parameters such as the fiber length, bandwidth, modulation depth, radio cell size and relative RF power of both systems. In this paper we analyze the uplink and show a way to decide the cumulative optical modulation index (μ) and the RF power ratio (T) that will yield the best performance for both systems.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134013327","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686208
H. M. Al-Neyadi
A successive detection technique using a multi-stage finite impulse response filter, controlled by the constant modulus algorithm (CMA), and a signal canceller (SC) to enable the blind detection of DS-CDMA signals is presented. This CMA/SC multi-stage system shows robustness of detection of different users in dense environments, it is easily implemented by simple gradient algorithms, and it requires lower computational effort than other reported algorithms. In addition, it does not require a knowledge of the spreading codes of the different users. A drawback of this multi-stage CMA/SC system is the relatively slow convergence of the CMA algorithm, which may not be suitable for some applications. This paper describes in detail a recursive constant-modulus filter/signal canceller (RCMA/SC) for the blind detection of DS/CDMA signals over an additive white Gaussian noise (AWGN) channel. The RCMA is derived by analogy to the recursive least squares algorithm (RLS) as a fast version of the CMA. The convergence properties of the algorithm are analyzed and compared with the conventional CMA. Simulation examples, for both the CMA and the RCMA, are given, to demonstrate the robustness of the proposed algorithm and its superiority from the point of view of fast convergence.
{"title":"Successive blind recursive constant modulus detectors for DS/CDMA signals with BPSK modulation","authors":"H. M. Al-Neyadi","doi":"10.1109/IEEEGCC.2006.5686208","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686208","url":null,"abstract":"A successive detection technique using a multi-stage finite impulse response filter, controlled by the constant modulus algorithm (CMA), and a signal canceller (SC) to enable the blind detection of DS-CDMA signals is presented. This CMA/SC multi-stage system shows robustness of detection of different users in dense environments, it is easily implemented by simple gradient algorithms, and it requires lower computational effort than other reported algorithms. In addition, it does not require a knowledge of the spreading codes of the different users. A drawback of this multi-stage CMA/SC system is the relatively slow convergence of the CMA algorithm, which may not be suitable for some applications. This paper describes in detail a recursive constant-modulus filter/signal canceller (RCMA/SC) for the blind detection of DS/CDMA signals over an additive white Gaussian noise (AWGN) channel. The RCMA is derived by analogy to the recursive least squares algorithm (RLS) as a fast version of the CMA. The convergence properties of the algorithm are analyzed and compared with the conventional CMA. Simulation examples, for both the CMA and the RCMA, are given, to demonstrate the robustness of the proposed algorithm and its superiority from the point of view of fast convergence.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123091139","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686234
H. Fourar
Many companies want to use Internet as a sale channel and to perform e-business transactions. However, many companies doing business on the Web are faced with security issues which must be addressed in order to protect sensitive information. Businesses must find ways to authenticate employees, customers, suppliers and partners while ensuring the security of transactions, and sensitive information. This paper present a solution for facilitating authentication and access control through a web connection. Smart cards are a key feature of this solution. The solution proposed is based on 3 authentication methods and use cryptography techniques.
{"title":"A remote authentication model using smart cards","authors":"H. Fourar","doi":"10.1109/IEEEGCC.2006.5686234","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686234","url":null,"abstract":"Many companies want to use Internet as a sale channel and to perform e-business transactions. However, many companies doing business on the Web are faced with security issues which must be addressed in order to protect sensitive information. Businesses must find ways to authenticate employees, customers, suppliers and partners while ensuring the security of transactions, and sensitive information. This paper present a solution for facilitating authentication and access control through a web connection. Smart cards are a key feature of this solution. The solution proposed is based on 3 authentication methods and use cryptography techniques.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132653126","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686228
O. Ramadan
Efficient and simple formulations of the Perfectly Matched Layer (PML) are presented for truncating metamaterial Finite Difference Time Domain (FDTD) grids. The formulations are based on incorporating the Z-transform theory into the FDTD algorithm to model the frequency dependence property of the metamaterials. Numerical example carried out in one dimensional metamaterial domain is included to validate the proposed formulations.
{"title":"Z-transform PML algorithm for truncating metamaterial FDTD domains","authors":"O. Ramadan","doi":"10.1109/IEEEGCC.2006.5686228","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686228","url":null,"abstract":"Efficient and simple formulations of the Perfectly Matched Layer (PML) are presented for truncating metamaterial Finite Difference Time Domain (FDTD) grids. The formulations are based on incorporating the Z-transform theory into the FDTD algorithm to model the frequency dependence property of the metamaterials. Numerical example carried out in one dimensional metamaterial domain is included to validate the proposed formulations.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114760466","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686213
K. Anwar, M. Saito, T. Hara, M. Okada, H. Yamamoto
In this paper, we propose a novel fast and low complexity algorithm of computation for minimum-mean-square-error (MMSE) equalizer or combiner without divisions. Multiplicative effect of fading channel should be compensated by divisions at the receiver. Therefore, equalizer or combiner at the receiver is derived by inverting the channel impulse responses. Here, the number of divisions equals to the number of subcarriers. For the next generation with high bit rate applications, these divisions are necessary to be computed in a very short time and may impact to the increasing of hardware complexities. The main contribution of this paper is a proposed fast algorithm by replacing the large number of divisions with multiplications and subtraction due to its lower complexity. We improve the performance of Newton-Raphson Method by a range extension so that the Newton-Raphson Method is applicable for MMSE computation with small number of iterations. Our results in Carrier Interferometry Orthogonal Division Multiplexing (CI/OFDM) confirm that with only two iterations, performance of the proposed algorithm can achieve the similar performance as the normal computation with divisions.
{"title":"A novel fast computation without divisions for MMSE equalizer and combiner","authors":"K. Anwar, M. Saito, T. Hara, M. Okada, H. Yamamoto","doi":"10.1109/IEEEGCC.2006.5686213","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686213","url":null,"abstract":"In this paper, we propose a novel fast and low complexity algorithm of computation for minimum-mean-square-error (MMSE) equalizer or combiner without divisions. Multiplicative effect of fading channel should be compensated by divisions at the receiver. Therefore, equalizer or combiner at the receiver is derived by inverting the channel impulse responses. Here, the number of divisions equals to the number of subcarriers. For the next generation with high bit rate applications, these divisions are necessary to be computed in a very short time and may impact to the increasing of hardware complexities. The main contribution of this paper is a proposed fast algorithm by replacing the large number of divisions with multiplications and subtraction due to its lower complexity. We improve the performance of Newton-Raphson Method by a range extension so that the Newton-Raphson Method is applicable for MMSE computation with small number of iterations. Our results in Carrier Interferometry Orthogonal Division Multiplexing (CI/OFDM) confirm that with only two iterations, performance of the proposed algorithm can achieve the similar performance as the normal computation with divisions.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115484789","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：