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2007 International Conference on Electrical Engineering最新文献

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Image Compression via Dithering for Enhanced Images 图像压缩通过抖动增强图像
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287322
F. Mohammad, A. Munir
{"title":"Image Compression via Dithering for Enhanced Images","authors":"F. Mohammad, A. Munir","doi":"10.1109/ICEE.2007.4287322","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287322","url":null,"abstract":"The problems of image storage and transfer are prevalent until today. For several decades now, image compression has been explored with the intent of achieving high compression rates in conjunction with superior image quality. In this paper, a lossy image compression algorithm is proposed that is based on dithering an image using a modified version of the standard error diffusion algorithm. Prior to dithering, the image is first enhanced in the frequency domain. Results indicate that not only is the goal of image compression realized but also the decompressed image promotes retention of fine detail with less random distribution of pixels around object edges. Experiments were conducted on several types of images using both a subjective as well as an objective approach. The compression achieved in terms of the reduction of gray levels is significant and the superior quality of the decompressed image using the method proposed is evident.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133820825","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}
引用次数: 1
Split Step Fourier Method Based Pulse Propagation Model for Nonlinear Fiber Optics 基于分步傅立叶方法的非线性光纤脉冲传输模型
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287333
M. Y. Hamza, S. Tariq
{"title":"Split Step Fourier Method Based Pulse Propagation Model for Nonlinear Fiber Optics","authors":"M. Y. Hamza, S. Tariq","doi":"10.1109/ICEE.2007.4287333","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287333","url":null,"abstract":"A pulse propagation model is essential to investigate various effects in nonlinear optical fiber communications. Split step Fourier method (SSFM) is an efficient technique to implement nonlinear Schrodinger equation (NLSE) which describes pulse propagation phenomenon in optical fiber. We report some simulation results obtained using our developed model based on SSFM. Our results are in well accordance with the standard results presented in the literature. We also report the effects of pre-and post-compensations to minimize pulse degradation in the presence of fiber loss, dispersion and nonlinearity. Our developed model can be used to analyze various aspects of pulse propagation in nonlinear optical fiber communications.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124776625","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}
引用次数: 10
Control of Total Harmonic Distortion of Voltage with New Chaotic Simulated Annealing 新型混沌模拟退火控制电压总谐波畸变
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287314
S. Ghadami, M. Moghiman
{"title":"Control of Total Harmonic Distortion of Voltage with New Chaotic Simulated Annealing","authors":"S. Ghadami, M. Moghiman","doi":"10.1109/ICEE.2007.4287314","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287314","url":null,"abstract":"This paper proposes a method to control the total harmonic distortion of voltage (THDV) with a new simulated annealing algorithm. The non-linear relationship between voltage harmonics and the THDV is identified by using the revised group method of data handling (RGMDH) based on the self-organization technique. A new chaotic simulated annealing algorithm (NCSA) is applied to minimize the THDV. The SA algorithm accepts higher energy solutions with probability of min (1, exp (-DeltaE/T)). To evade time wasting exponential calculations, the proposed algorithm introduces a new acceptance criterion that uses a chaotic structure and allows efficient state transitions. Determination of the appropriate neighborhood range is a main concern in SA algorithm. Therefore, in order to search the neighborhood sufficiently and efficiently, a different approach has been taken toward the neighbor selection process combining chaotic maps and Gaussian distribution. The effectiveness of the proposed method is demonstrated by test data.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122312117","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}
引用次数: 1
Effect of Nonlinear Load Distributions on Total Harmonic Distortion in a Power System 非线性负荷分布对电力系统总谐波畸变的影响
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287356
W. Abbas, M. A. Saqib
{"title":"Effect of Nonlinear Load Distributions on Total Harmonic Distortion in a Power System","authors":"W. Abbas, M. A. Saqib","doi":"10.1109/ICEE.2007.4287356","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287356","url":null,"abstract":"The increased use of solid state devices at the consumer end has introduced a power quality issue in the form of harmonic distortion due to their nonlinear nature. The magnitude of this harmonic distortion varies with the nonlinear load distribution at various voltage levels of a system. This paper presents a detailed analysis of harmonic distortion in terms of THD for various load combinations in a power system. The trends in THD variations are obtained at various operating conditions. The effect of introducing nonlinear loads at various voltage levels of a system is discussed. The effect of harmonic model of nonlinear load in terms of variation of THD at different buses and the degradation effects of these harmonic distortions are also presented.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122324751","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}
引用次数: 21
Soft Starting of an Induction Motor using Adaptive Neuro Fuzzy Inference System 基于自适应神经模糊推理系统的感应电机软启动
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287353
A. R. Kashif, M. A. Saqib
{"title":"Soft Starting of an Induction Motor using Adaptive Neuro Fuzzy Inference System","authors":"A. R. Kashif, M. A. Saqib","doi":"10.1109/ICEE.2007.4287353","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287353","url":null,"abstract":"Induction motors are used in industry in variety of applications such as blowers, fans, compressors, pumps, mixers, crushers and grinders etc. Soft starters, involving voltage controllers, are used for starting and speed adjustment of induction motors. This paper presents a neural network based soft starter which controls the speed by the adjustment of firing angles of thyristors. The suggested technique eliminates the starting torque pulsations by triggering the back to back connected thyristors. The control strategy is implemented using microcontrollers and neural networks and performance analysis of the system is carried out with the help of hybrid model of induction motor. The results obtained are satisfactory and promising. The advantage of such a soft starter is its simplicity, stability and high accuracy as compared to the conventional soft starter which uses mathematical calculations of firing angle which is a complex and time consuming task especially in on-line control applications.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132252697","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}
引用次数: 14
A Local Transformation Function for images 图像的局部变换函数
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287358
A.M. Siddiqi, M. Saleem, A. Masud
{"title":"A Local Transformation Function for images","authors":"A.M. Siddiqi, M. Saleem, A. Masud","doi":"10.1109/ICEE.2007.4287358","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287358","url":null,"abstract":"Finding transformation functions, which warps images with nonlinear local deformations, is the most challenging tasks. In transformations like thin plate spline (TPS), multiquadrics (MQ) and weighted means (WM), errors in the correspondence or local image deformations spread over the entire resampled image. These transformation functions may map control points in the sensed image to the corresponding control points in the reference image accurately, but they warp the target image too much, causing large errors in the mapping away from the control points .In this paper a transformation function is presented to deal the local deformations present in the images, which is simple to implement. The results exhibit that the effects of control points are limited to a small neighborhood of the control points, the algorithms keeps inaccuracies in the correspondences local without spreading them to the entire image. Moreover the effect of the deformation decreases as we move away from the control point.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130209709","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}
引用次数: 3
Analysis of Blackout of National Grid System of Pakistan in 2006 and the Application of PSS and FACTS Controllers as Remedial Measures 2006年巴基斯坦国家电网停电事故分析及PSS和FACTS控制器作为补救措施的应用
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287339
M. Younas, S. Qureshi
{"title":"Analysis of Blackout of National Grid System of Pakistan in 2006 and the Application of PSS and FACTS Controllers as Remedial Measures","authors":"M. Younas, S. Qureshi","doi":"10.1109/ICEE.2007.4287339","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287339","url":null,"abstract":"On 24th September, 2006, a severe disturbance occurred on the National Grid System of Pakistan which caused cascading outages of transmission lines and generating stations that ultimately led to system wide collapse/blackout. This major blackout was one of the worst power system failures of WAPDA, the main electric utility of Pakistan. This paper provides an insight of the investigations to identify system constraints that caused blackout The bulk power transfer on long 500 kV transmission lines in northern part of WAPDA, prior to blackout, had already loaded them close to their stability limits. As a result, the system, after a disturbance, was stressed further beyond its capability and experienced small signal and voltage instabilities, which led to its collapse. In this paper, detailed analytical work including steady state and dynamic simulations/analyses have been carried out to study the behaviour of VVAPDA power system during collapse. Later, the effectiveness of the power system controllers, i.e., power system stabilizers (PSS) and flexible AC transmission system (FACTS) has been demonstrated as remedial measures to prevent such major system blackout.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125695583","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}
引用次数: 12
Dynamic Priority Based Message Scheduling on Controller Area Network 基于动态优先级的控制器局域网消息调度
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287302
K. Anwar, Z. Khan
{"title":"Dynamic Priority Based Message Scheduling on Controller Area Network","authors":"K. Anwar, Z. Khan","doi":"10.1109/ICEE.2007.4287302","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287302","url":null,"abstract":"Controller area network (CAN) is a serial communication protocol developed in early 1980's by Robert Bosch. Low cost, ease of use and ability to work in harsh EMI environments have resulted in its widespread acceptance in automotive and automation industry. Message scheduling and access to the bus in CAN is performed through a fixed Message Identifier field, which is also the basis for a static priority. Although this fixed priority apparently results in good bus utilization but low priority messages may suffer from starvation due to an ill designed message identifier allocation scheme. Also with its introduction into newer fields, the fixed priority per message is looking to be a limitation for some applications. Un till now there has been no work to add this faculty to CAN in a standardize way. This paper presents a set of algorithms and guide lines to support the dynamically changing priorities in a CAN network without breaking the integration with existing CAN based networks. The scheme is effectively a generalization of the single priority per message to a multi-priority-window per message.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126331432","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}
引用次数: 13
A New Moduli Set for Residue Number System: {rn 2,rn 1,rn} 剩数系统的一个新的模集:{rn 2,rn 1,rn}
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287306
M. Hosseinzadeh, K. Navi, S. Gorgin
{"title":"A New Moduli Set for Residue Number System: {rn 2,rn 1,rn}","authors":"M. Hosseinzadeh, K. Navi, S. Gorgin","doi":"10.1109/ICEE.2007.4287306","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287306","url":null,"abstract":"In this paper a new moduli set {rn -2,rn -1,rn} is introduced where r = 2k + 1 and k= 1,2,3,... . This moduli set includes pair wise relatively prime moduli, so it offers the maximum possible dynamic range. For this moduli set, the related circuits are simply realized in the Multiple Valued Logic (MVL) and arithmetic in this moduli set enjoys very high speed operations and simple reverse/forward conversion (RNS to MVL/MVL to RNS). After introducing the new moduli set, we design its related circuits and converters. Finally, we compare the results to those of similar moduli sets and show that our moduli set significantly improves the time complexity while offers greater dynamic range.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126459551","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}
引用次数: 22
Adaptive Segmentation Using Wavelet Transform 基于小波变换的自适应分割
2007 International Conference on Electrical Engineering Pub Date : 2007-04-11 DOI: 10.1109/ICEE.2007.4287348
H. Hassanpour, M. Shahiri
{"title":"Adaptive Segmentation Using Wavelet Transform","authors":"H. Hassanpour, M. Shahiri","doi":"10.1109/ICEE.2007.4287348","DOIUrl":"https://doi.org/10.1109/ICEE.2007.4287348","url":null,"abstract":"In many applications analysis of nonstationary signals requires the signal to be segmented into piece-wise stationary epochs. Segmentation can be performed by splitting the signal at time instants of charge in the amplitude or frequency content of the signal. In this paper, the signal is decomposed into signals with different frequency bands using wavelet transform. The nonlinear energy operator is then applied on the decomposed signals, which combines the amplitude and frequency contents of the signal. The proposed technique is applied on synthetic signal and real EEG data to evaluate its performance on segmenting nonstationary signals. The results show that the proposed technique outperforms the recently published method in decomposing nonstationary signals.","PeriodicalId":291800,"journal":{"name":"2007 International Conference on Electrical Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115313759","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}
引用次数: 30
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