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2010 18th Iranian Conference on Electrical Engineering最新文献

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Average, dynamic model of multi-pulse rectifiers 多脉冲整流器的平均动态模型
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5506981
A. Baghramian
{"title":"Average, dynamic model of multi-pulse rectifiers","authors":"A. Baghramian","doi":"10.1109/IRANIANCEE.2010.5506981","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5506981","url":null,"abstract":"Average, dynamic models of rectifier converters are required to carry out stability and voltage regulation studies on systems based on multi-pulse rectifier fed motor-drive equipment systems. Existing methods of analysis are extremely complicated and difficult to apply to anything other than single converters with a low pulse number. This paper presents a simple, direct method for deriving the approximate, small-signal, average model of multi-pulse rectifiers. The method is based on the assumption of small overlap duration. The average, small-signal, dynamic model of a sample six-pulse rectifier is developed and validated against detailed simulation and laboratory measurements.","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"19 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114135032","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
A fast hybrid approach for approximating a thin-plate spline surface 近似薄板样条曲面的快速混合方法
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5507075
M. Nejati, R. Amirfattahi, S. Sadri
{"title":"A fast hybrid approach for approximating a thin-plate spline surface","authors":"M. Nejati, R. Amirfattahi, S. Sadri","doi":"10.1109/IRANIANCEE.2010.5507075","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5507075","url":null,"abstract":"Thin-plate spline (TPS) is a common method to smooth interpolation of bivariate scattered data. However, this method has been associated with very high computational cost, particularly when number of scattered data becomes large and interpolation function must be evaluated on a large grid. This paper describes a hybrid approach for computing a C2-continuous surface using combination of thin-plate spline and cubic spline interpolation that approximates the thin-plate spline interpolation function. Experimental results show that this method significantly speeds up the evaluation of thin-plate spline interpolation function in comparison with direct evaluation, particularly in the cases that interpolation function must be evaluated on a large grid.","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"23 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120887504","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: 6
Comparison of voxel-based morphometry (VBM) and tractography of diffusion tensor MRI (DT-MRI) in temporal lobe epilepsy 颞叶癫痫体素形态测量(VBM)与扩散张量MRI (DT-MRI)束状图的比较
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5507113
M. Afzali, H. Soltanian-Zadeh
{"title":"Comparison of voxel-based morphometry (VBM) and tractography of diffusion tensor MRI (DT-MRI) in temporal lobe epilepsy","authors":"M. Afzali, H. Soltanian-Zadeh","doi":"10.1109/IRANIANCEE.2010.5507113","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5507113","url":null,"abstract":"Temporal lobe epilepsy (TLE) is a neurological disease that affects millions of individuals in the world. Majority of TLE patients suffer from refractory seizures. Determining abnormal/damaged regions of the brain that harbor seizure focus is a critical step towards treatment of TLE patients. Diffusion tensor imaging (DTI) is a non-invasive method that we use in this work to determine damaged regions of white matter in the brain. To this end, we apply two methods, voxel based morphometry (VBM) and fiber tracking. We use these methods along with two anisotropy maps (EAR and FA) extracted from the DTI data. We use DTI data of 31 subjects (12 normal subjects and 19 TLE patients) for testing and evaluation studies. The VBM method shows that TLE is associated with reduction of both of FA and EAR values in several regions within the temporal lobes. The tractography method shows abnormal diffusion characteristics in three fiber bundles (fornix, uncinate fasciculus, and cingulum). The results show that the EAR maps are less sensitive to noise than the FA maps and the EAR values change more than the FA values in TLE.","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121700828","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: 7
A novel obstacle detection method using stereo vision and two-stage dynamic programming 一种新的基于立体视觉和两阶段动态规划的障碍物检测方法
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5507077
Hajar Mohammadi Dehnavi, Sakineh Shirazi Tehrani, P. Moallem
{"title":"A novel obstacle detection method using stereo vision and two-stage dynamic programming","authors":"Hajar Mohammadi Dehnavi, Sakineh Shirazi Tehrani, P. Moallem","doi":"10.1109/IRANIANCEE.2010.5507077","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5507077","url":null,"abstract":"Stereo vision based obstacle detection is an algorithm that aims to detect and compute obstacle depth using stereo matching and disparity map. This paper presents a novel method to detect obstacles in highly textured environments using two-stage dynamic programming. The algorithm consists of several steps including pre-processing, obstacle detection, analysis of disparity map using two-stage dynamic programming (TSDP) technique and depth computation. This method works well in highly textured environments and ideal for real applications. The disparity map for the stereo images is found in the 3D correlation coefficient volume by obtaining the global 3D maximum-surface rather than simply choosing the position that gives the local maximum correlation coefficient value for each pixel. The 3D maximum-surface is obtained using two-stage dynamic programming (TSDP) technique. An adaptive thresholding is also applied for better noise and texture removal. Experimental results show the effectiveness of the proposed method.","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123868222","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
Adaptive RLS algorithm for nonlinearity modeling in the nanometrology system 纳米计量系统非线性建模的自适应RLS算法
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5507032
S. Olyaee, Mohammad Shams Esfand Abadi, S. Hamedi, Fatemeh Finizadeh
{"title":"Adaptive RLS algorithm for nonlinearity modeling in the nanometrology system","authors":"S. Olyaee, Mohammad Shams Esfand Abadi, S. Hamedi, Fatemeh Finizadeh","doi":"10.1109/IRANIANCEE.2010.5507032","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5507032","url":null,"abstract":"The periodic nonlinearity in the nanometrology systems based on the laser heterodyne interferometers mainly arises from imperfect laser source and misalignment of their optical setup. The accuracy of the nanometric displacement measurements can be effectively limited by the periodic nonlinearity. In this paper, we model the periodic nonlinearity in a modified laser heterodyne interferometer by adaptive recursive least square (RLS) algorithm. It is shown that this approach can obtain optimal modeling parameters of the nonlinearity. The results show that the RLS algorithm has faster conversions speed and lower steady state mean square error (MSE) in the nonlinearity modeling, comparing the neural network approach.","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122947073","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
Implementation of main waveguide cavities of electron linear accelerator using integrated and separable methods and comparing their performance 电子直线加速器主波导腔的集成与分离实现及性能比较
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5507099
M. Abbasi, Farshad Ghasemi, F. Abbasi Davani
{"title":"Implementation of main waveguide cavities of electron linear accelerator using integrated and separable methods and comparing their performance","authors":"M. Abbasi, Farshad Ghasemi, F. Abbasi Davani","doi":"10.1109/IRANIANCEE.2010.5507099","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5507099","url":null,"abstract":"There are many methods for fabricating electron linear accelerator cavities. In the present research two methods were chosen: first, separable parts (separate ring and disks) and second, parallel disks and cylinder (integrated). The resonance frequencies of cavities and the quality factor of each frequency are two important parameters in their performance. The comparison of measured parameters of the cavities made with two methods, firstly by the network analyzer machine and secondly using the HFSS simulator. The results of both the practical measurements and the simulation of the two structures indicated that the integrated method is better for implementing cavities","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116510386","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: 5
A robust audio watermarking algorithm based on frequency hopping 基于跳频的鲁棒音频水印算法
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5507066
S. Mahdavi, S. Seydnejad, S. Saryazdi
{"title":"A robust audio watermarking algorithm based on frequency hopping","authors":"S. Mahdavi, S. Seydnejad, S. Saryazdi","doi":"10.1109/IRANIANCEE.2010.5507066","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5507066","url":null,"abstract":"In this paper a novel audio watermarking algorithm based on the idea of frequency hopping is presented. Two separate sets of different frequencies are used to transmit message bits ‘0’ and ‘1’. These frequencies have been selected to tolerate different attacks while keeping the watermark signal inaudible. To embed each bit of the binary message a pair of frequency is selected randomly from the given sets for each audio segment. One frequency is picked up from the pair based on the message bit and the frequency content of the audio segment. A sinusoidal carrier is generated at this frequency and is used as the watermark in the segment. The amplitude of this sinusoidal carrier is shaped based on critical band filters which models the human auditory system (HAS). The content based properties of the proposed scheme offers maximum flexibility while satisfying robustness and high capacity, simultaneously. Simulation and experimental results show high resistance of the proposed algorithm against all known watermarking attacks for different kinds of audio clips.","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"184 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132653917","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
Secrecy capacity of wiretap channel for a new scenario and designing code for wiretap channel 新场景下窃听信道的保密能力及窃听信道的编码设计
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5507079
V. Jahandideh, Somayeh Salimi, M. Salmasizadeh
{"title":"Secrecy capacity of wiretap channel for a new scenario and designing code for wiretap channel","authors":"V. Jahandideh, Somayeh Salimi, M. Salmasizadeh","doi":"10.1109/IRANIANCEE.2010.5507079","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5507079","url":null,"abstract":"The concept of information theoretic security is introduced. Secrecy capacity of two receiver broadcast channel for a new scenario is derived in which it is assumed that the legitimate receiver has access to a noisy version of eavesdroppers channel outputs. Also the ideas of code designing to achieve zero error on main channel and perfect secrecy on the eavesdropper's channel, without invoking complicated capacity achieving codes are provided.","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"112 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133749607","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: 0
Low bit rate image compression by two layer wavelet and contourlet transforms 采用两层小波变换和轮廓波变换进行低比特率图像压缩
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5507052
Hossein Talebi Esfandarani, N. Karimi, S. Samavi
{"title":"Low bit rate image compression by two layer wavelet and contourlet transforms","authors":"Hossein Talebi Esfandarani, N. Karimi, S. Samavi","doi":"10.1109/IRANIANCEE.2010.5507052","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5507052","url":null,"abstract":"Low bit rate applications, such as cell phone and wireless transmission of images, require compression schemes that could keep acceptable levels of visual quality of the medium. In this paper a multi layer compression scheme is presented which is intended to preserve the texture details of an image at low bit rates. The first layer uses wavelet transform for extraction of textures. Then in the second layer the strength of the contourlet transform in preservation of textures is employed to compress the highlighted textures of the image. The proposed method is compared with a number of low bit rate methods and proved to be superior to these methods.","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"404 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114761810","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: 0
Optimal quality competition for spectrum sharing in cognitive radio networks 认知无线电网络中频谱共享的最优质量竞争
2010 18th Iranian Conference on Electrical Engineering Pub Date : 2010-05-11 DOI: 10.1109/IRANIANCEE.2010.5507068
Hoda Shah Mohammadian, B. Abolhassani
{"title":"Optimal quality competition for spectrum sharing in cognitive radio networks","authors":"Hoda Shah Mohammadian, B. Abolhassani","doi":"10.1109/IRANIANCEE.2010.5507068","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2010.5507068","url":null,"abstract":"Cognitive radio is a new technology for improving frequency spectrum usage in wireless networks. A pivotal issue in cognitive radio is spectrum sharing, which allows primary (licensed) users to share their licensed radio frequency spectrum with secondary (unlicensed) users. In this paper, we will model the cognitive radio environment as a quality based competition. We consider the spectrum sharing problem between multiple primary users and only one secondary user. The novelty of this paper is that we formulate this problem as an oligopoly market competition and use the Cournot game (quality-based competition) to obtain the optimal spectrum allocation for the secondary user. Nash equilibrium is considered as the solution of this game. We will consider two different cases: static game in which each user can observe the adopted strategies and the payoff of others and dynamic game in which the strategy of each user is selected based on only the information obtained during the game. At the end, the stability condition for the dynamic case of spectrum sharing is investigated. Performance evaluation shows that our model results in more profits for primary users with lower offered prices for the secondary user and larger shared spectrum sizes at the expense of some stability decrease.","PeriodicalId":282587,"journal":{"name":"2010 18th Iranian Conference on Electrical Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117119235","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: 7
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