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2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering最新文献

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Ab initio calculation of four-vector potential and electromagnetic field for a charge moving arbitrarily in a cylindrical drift tube 在圆柱漂移管中任意移动电荷的四向量势和电磁场的从头计算
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602562
K. Ilyenko, G. Gorbyk, T. Yatsenko
{"title":"Ab initio calculation of four-vector potential and electromagnetic field for a charge moving arbitrarily in a cylindrical drift tube","authors":"K. Ilyenko, G. Gorbyk, T. Yatsenko","doi":"10.1109/SIBIRCON.2008.4602562","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602562","url":null,"abstract":"Using the method of Greenpsilas functions we found the four-vector potential and electromagnetic field components for a charge moving along an arbitrary path in a perfectly conducting cylindrical waveguide. Solutions are expressed analytically through Greenpsilas functions of the dpsilaAlembert operator with the Dirichlet and Neumann boundary conditions. It is shown that if the waveguide is excited only by a longitudinal current density component and/or non-zero charge density (transverse current components) the obtained solution reduces to the well-known expressions for TM (TE) cylindrical waveguide modes. If transverse and longitudinal current density components and non-zero charge density are present simultaneously in the waveguide, then the radial structure of the excited electro-magnetic field coincides with that of the superposition of TM and TE cylindrical waveguide modes. The results thus obtained allow one a direct calculation of the forces acting on an arbitrarily moving relativistic charge from the induced by-itself charges and currents at the waveguide walls. They also provide a basis for solution of a rigorous self-consistent problem on the non-stationary propagation of relativistic electron beams in cylindrical drift tubes with the account for space-charge effects. As an example of applications, under the Coulomb gauge, we analytically calculate the scalar potential and density of induced charge on the cylindrical perfectly conducting drift tube walls, which are caused by a moving non-relativistic point-like charge. We also find the potential part of the quasi-electrostatic force exerted on such a charge by the charge density induced by it on the drift tube walls.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129431798","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: 2
A flexible sample and hold circuit for data converter applications 一种用于数据转换器应用的灵活采样和保持电路
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602556
M. Yousefi, Z. D. Koozekanani, A. Rostami, J. Sobhi, M. Zarifi
{"title":"A flexible sample and hold circuit for data converter applications","authors":"M. Yousefi, Z. D. Koozekanani, A. Rostami, J. Sobhi, M. Zarifi","doi":"10.1109/SIBIRCON.2008.4602556","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602556","url":null,"abstract":"The sample and hold circuit is perhaps the most important building block in most data acquisition systems such as data converter. Flexibility of this block can be used to improve the whole performance of the system. In this work a flexible structure with variable gain is presented. The circuit is used to calibrate a typical time interleaved analog to digital converter. Simulation results indicated that modified circuit is superior in some aspects to the commonly used architectures. Designed circuit is simulated in a standard 0.35 mum CMOS technology, the SHA achieves 87 dB SFDR for 2 Vpp input at 200 MHz sampling rate. The performance is not degraded for inputpsilas frequency up to the Nyquist frequency.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130772484","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: 4
A novel data compression algorithm for dynamic data 一种新的动态数据压缩算法
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602560
R. Gupta, A. Gupta, S. Agarwal
{"title":"A novel data compression algorithm for dynamic data","authors":"R. Gupta, A. Gupta, S. Agarwal","doi":"10.1109/SIBIRCON.2008.4602560","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602560","url":null,"abstract":"This paper presents a compression algorithm for dynamic data, the size of which keeps on increasing rapidly. It is a memory efficient data compression technique comprising of a block approach that keeps the data in compressed form as long as possible and enables the data to be appended to the already compressed text. The algorithm requires only a minimal decompression for supporting update of data using a little preprocessing which reduces the unnecessary time spent in compression-decompression to support update by the algorithms deigned till now to a minimum. Further, the text document can be modified as required without decompressing and again compressing the whole document. The paper also presents the design of the required data structures for our algorithm with performance results.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"72 1-3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132330976","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: 8
Utilization of lattice reduction approach in MIMO decoding 晶格约简方法在MIMO译码中的应用
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602652
A. Rog, D. Mazzarese, S. Goreinov
{"title":"Utilization of lattice reduction approach in MIMO decoding","authors":"A. Rog, D. Mazzarese, S. Goreinov","doi":"10.1109/SIBIRCON.2008.4602652","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602652","url":null,"abstract":"In this paper we investigate utilization of lattice-reduction (LR) approach for MIMO decoding in multiple antenna systems. We show how to expand LR method initially designed for real value lattices into complex lattices utilized in MIMO OFDM systems. We offer the two effective schemes of MIMO decoder based on complex LR, one generating hard bit output, while the other generating soft bit output. We show that proposed schemes demonstrate superior performance to conventional algorithms while having comparable complexity.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126546033","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 electron density in RF-discharge on etching rate in plasma-chemical reactor 射频放电中电子密度对等离子体化学反应器腐蚀速率的影响
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602587
Y. Grigoryev, A. Gorobchuk
{"title":"Effect of electron density in RF-discharge on etching rate in plasma-chemical reactor","authors":"Y. Grigoryev, A. Gorobchuk","doi":"10.1109/SIBIRCON.2008.4602587","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602587","url":null,"abstract":"The effect of O2 additive concentration on silicon etching process in a tetrafluoromethane-oxygen mixture is investigated on the base of numerical modeling. The calculations were carried out using an advanced mathematical model of a plasma-chemical reactor. The model takes into account peculiarities of plasma kinetics in a RF-discharge. The gas flow is described by the equations of multicomponent hydrodynamics including convective-diffusion transfer and production of all mixture components. In the paper the electron density influencing the main characteristics of silicon etching is presented. It is shown that the fall of average density of energetic electrons in the reactor due to oxygen addition can decrease the etching rate in a range up to 30% but in any case the etching rate in the mixture stays essentially higher than that in pure tetrafluoromethane.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"348 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122334111","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
Dynamic voltage restorer using a new compensation voltage control and converter based input-output linearization 动态电压恢复器采用了一种新的补偿电压控制和基于变换器的输入输出线性化
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602585
V. Pires, G. Marques, J. Martins, J. Silva
{"title":"Dynamic voltage restorer using a new compensation voltage control and converter based input-output linearization","authors":"V. Pires, G. Marques, J. Martins, J. Silva","doi":"10.1109/SIBIRCON.2008.4602585","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602585","url":null,"abstract":"Dynamic voltage restorer (DVR) is known as an effective device to mitigate voltage sags and swells. This paper presents a control method based on the input-output linearization applied to the DVR. The synthesis of the parameters is presented. A new compensation voltage control is also proposed. This control is based on the Clark-Concordia transformation and a robust PLL structure. Several simulation results are presented. This allows showing the performance of the control method based on the input-output linearization applied to the DVR and the effectiveness of the compensation voltage control.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114240854","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: 4
Simulation by FEM of thermo-optical tuning of wide heterogeneous SOI waveguides 宽非均质SOI波导热光调谐的有限元模拟
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602636
A. Tsarev, V. Passaro, F. De Leonardis
{"title":"Simulation by FEM of thermo-optical tuning of wide heterogeneous SOI waveguides","authors":"A. Tsarev, V. Passaro, F. De Leonardis","doi":"10.1109/SIBIRCON.2008.4602636","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602636","url":null,"abstract":"This work presents an analysis of thermo-optic switching of novel heterogeneous silicon-on-insulator (SOI) waveguide structures for tunable photonic devices. Structure design includes a heater over p+ side-doping ridge waveguide with 220 nmtimes24 mum silicon core. It provides quasi mono-mode switching due to strongly mode-dependent optical losses by free charge absorption.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134354822","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
Analysis of SUPL A-GPS (Secure User Plane Location) in indoor areas SUPL - gps(安全用户平面定位)在室内区域的分析
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602567
O. Bayrak, T. Goze, M. Barut, M. O. Sunay
{"title":"Analysis of SUPL A-GPS (Secure User Plane Location) in indoor areas","authors":"O. Bayrak, T. Goze, M. Barut, M. O. Sunay","doi":"10.1109/SIBIRCON.2008.4602567","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602567","url":null,"abstract":"The main purpose of this paper is to realize a new assisted GPS (A-GPS) architecture based on SUPL (secure user plane location). This architecture provides very good accuracy in location estimation. We provide comparative field test results of the developed system with the conventional GPS in terms of both the position accuracy and the TTFF (time to first fix) delay times. Field tests are conducted on a real GSM network in urban areas and indoor environments. Results show that the developed SUPL based A-GPS system achieves very good estimation accuracy and faster TTFF enabling high-performance mobile positioning for location based services.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133109009","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
Comparison of time domain and frequency domain equalizers for indoor UWB systems 室内超宽带系统时域和频域均衡器的比较
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602578
U. Waheed, Waqas Abdullah, Shakir Ahmed Siddiqui, Muhammad Daud Khan, Adeel Razi
{"title":"Comparison of time domain and frequency domain equalizers for indoor UWB systems","authors":"U. Waheed, Waqas Abdullah, Shakir Ahmed Siddiqui, Muhammad Daud Khan, Adeel Razi","doi":"10.1109/SIBIRCON.2008.4602578","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602578","url":null,"abstract":"In this paper we compare time domain (TDE) and frequency domain equalization (FDE) techniques for an Indoor Ultra Wide Band (UWB) channel. The innovation in the work is the employment of Overlap Save scheme, which unlike Cyclic Prefix guarantees no change in transmitter circuitry. The channel has been simulated according the model proposed by (Cassioli et al., 2002). Based on our simulation results, we show that a 128 point FFT/IFFT based FDE with an overlap save length of 64 gives the most optimal performance. The results also show that FDE and TDE give somewhat similar performance in the given scenario. However, TDE is not a feasible solution because of its exhaustive computational complexity. Hence, we propose the use of FDE with the above mentioned parameters for Indoor UWB systems.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"75 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113985208","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
Statistical analysis of packet delay in ad-hoc networks of mobile robots 移动机器人自组织网络中数据包延迟的统计分析
2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering Pub Date : 2008-07-21 DOI: 10.1109/SIBIRCON.2008.4602638
Malgorzata Gadomska-Kudelska, Michal Kudelski, Andrzej Pacut
{"title":"Statistical analysis of packet delay in ad-hoc networks of mobile robots","authors":"Malgorzata Gadomska-Kudelska, Michal Kudelski, Andrzej Pacut","doi":"10.1109/SIBIRCON.2008.4602638","DOIUrl":"https://doi.org/10.1109/SIBIRCON.2008.4602638","url":null,"abstract":"We perform analysis of packet end-to-end delay in order to explain the processes taking place in the network. We build statistical models to describe the packets end-to-end delay distribution. Our experiments show that packet delay in an ad-hoc network of mobile robots depends on the number of hops traveled by the packet. We intend to use this dependency when implementing a modification of the learning model of ant routing algorithms addressed to improve their performance in such demanding environments.","PeriodicalId":295946,"journal":{"name":"2008 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115100034","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
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