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12th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC 2006

作者： Zhang, Yong Shao, K.R. Guo, Youguang Xie, D.X. Lavers, J.D. IEEE Huazhong University of Science and Technology College of Electrical and Electronic Engineering Wuhan China Faculty of Engineering University of Technology Sydney NSW 2007 Australia Department of Electrical Engineering Shenyang University of Technology Shenyang 110023 China University of Toronto Department of Electrical and Computer Engineering Toronto M5S 3G4 Canada

ISBN: (纸本)1424403200

This paper presents boundary polynomial point interpolation meshless method (BPPIM) and boundary radial point interpolation meshless method (BRPIM) based on polynomial basis function (PBF) and radial basis function (RBF) respectively for transient eddy current analysis, and their interpolation shape functions satisfy the Kronecker delta function, thus the essential boundary conditions can be directly imposed on the boundary nodes. An example on analyzing transient eddy current of a square metal column is set to prove the validity of the proposed methods, and a comparison on accuracy between BPPIM and BRPIM is analyzed as well. © 2006 IEEE.

关键词： Numerical methods

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The analysis of UWB SiGe HBT LNA for its noise, linearity, and minimum group delay variation

The analysis of UWB SiGe HBT LNA for its noise, linearity, a...

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作者： Park, Yunseo Lee, Chang-Ho Cressler, John D. Laskar, Joy IEEE Georgia Electronic Design Center Georgia Institute of Technology Atlanta GA 30332-0250 United States Georgia Tech. Research Faculty Georgia Tech. Georgia Tech. Department of Electrical and Computer Engineering Department of Electronic Design and Applications Technical Interest Group Georgia's Electronic Design Center Packaging Research Center Georgia Institute of Technology

The design of ultra-wideband (UWB) low-noise amplifiers (LNAs) require additional circuit design principles, which differ from those used in conventional LNAs. The design of a low-dc-power-consumption SiGe HBT LNA covering the 2-10-GHz range is demonstrated for UWB applications. Important design factors that must be carefully considered for UWB applications are analyzed, which include power dissipation, operating bandwidth, noise figure, group delay variation, and linearity. The dominant factor for low group delay variation in UWB LNAs is identified through the theoretical analysis. The linearity behavior over the wide bandwidth is analyzed and explained using the Volterra series. Second-harmonic cancellation is determined to be the dominant degradation factor for linearity. The implemented SiGe LNA achieves a gain of 13 dB, a minimum noise figure of 3.3 dB, and an input third-order intercept point of -7.5 dBm between 2-10 GHz while consuming a dc power of only 9.6 mW. This SiGe UWB LNA exhibits less than 22 ps of uniform group delay variation over the entire band. © 2006 IEEE.

关键词： Amplifiers (electronic)

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An International Distance Learning System Based on the Internet and General Purpose technology

An International Distance Learning System Based on the Inter...

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International Conference on Information technology Based Higher Education and Training, ITHET

作者： Baorong Ni Ya Zhou Faculty of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Computer Science Guilin University of Electronic and Technology Guilin China

In this study, we constructed a distance education system for foreign graduate students who remotely take lessons, teach themselves and have a bidirectional communication with teachers or instructors. The system was configured with the necessary modules for the student's learning, such as giving live type lectures, presenting the on-demand type learning contents and managing the learning processes by using the general purpose technology, such as the Internet, recent data-streaming technology, and the general purpose hardware and software. The system has the function of remote operation of the video camera set in the classroom by the remote learners. With this function, the remote learner can not only recognize the characters and figures written on the blackboard, but also experience more active lessons with less boredom. In this system, It is possible to provide the bidirectional communications between all of the learners and instructors during the live type lecture. The practices of giving the regular graduate school courses of Fukuoka Institute of technology to the foreign graduate students in China were carried out.

关键词： computer aided instruction Internet Bidirectional control Distance learning Content management technology management Hardware Video on demand Cameras Character recognition

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Minimal-power, delay-balanced smart repeaters for interconnects in the nanometer regime 06

Minimal-power, delay-balanced smart repeaters for interconne...

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SLIP'06 - 2006 International Workshop on System Level Interconnect Prediction

作者： Weerasekera, Roshan Pamunuwa, Dinesh Zheng, Li-Rong Tenhunen, Hannu Department of Electronic Computer and Software Systems KTH Information and Communication Technology ELECTRUM 229 164 40 Kista Sweden Centre for Microsystems Engineering Faculty of Applied Sciences Lancaster University Lancaster LA1 4YR United Kingdom

ISBN: (纸本)1595932550

In this paper we propose a smart repeater that consumes less energy and is suitable for driving global interconnections in nanometre technologies. When there is coupling between interconnects, the effective capacitance of a given wire is a function not only of the physical geometry, but also the relative switching pattern described by the bits on the wire in question (the victim) and the adjacent wires (aggressors). The drive strength of a traditional repeater is static, resulting in a spread of the propagation delay, with the repeater strength being essentially too much for every bit pattern other than the worst-case pattern. In the proposed SMART repeater, the drive strength is dynamically altered depending on the relative bit pattern, by partitioning it into a Main Driver and Assistant Driver. For a higher effective load capacitance both drivers switch, while for a lower effective capacitance the assistant driver is quiet. By disconnecting part of the repeater when it is not needed, the total load capacitance to the previous stage is reduced, resulting in reduced energy consumption for those instances. It is shown that the potential average saving in energy can be as much 15% with a 18% jitter reduction over a traditional repeater for typical global wire lengths in nanometre technologies. Copyright 2006 ACM.

关键词： Telecommunication repeaters

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Interference and Compatibility Analysis of RF Communication Systems (MEASAT -Case Study)

Interference and Compatibility Analysis of RF Communication ...

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International RF and Microwave Conference, RFM

作者： Zulfiqar Ali Leghari Abdul Rani Bin Othman Ghulam Muhammed Faculty Electronic & Computer Engineering Kolej Universiti Teknikal Kebangsaan Malaysia Malacca Malaysia Faculty of Engineering & Technology Building Multimedia University Jalan Multimedia Malacca Malaysia

The paper demonstrate a case study of detailed interference and compatibility analysis of MEASAT networks vis-a-vis affected satellite networks having the orbital separation less than 8deg. For detailed interference and compatibly analysis of Measat-SA3 (37deg E) and Paksat-2 (41deg E) for C band uplink and downlink the authors have carried out analysis under ITU-R REC-740. The analysis demonstrates that two collocated satellite networks at the orbital separation of less than 5 degree can be operated in C-band for digital and analog communications without generating and accepting harmful interference (Zulfiqar Ali Leghari, 2005). For smooth and interference free transmission, both of the satellite networks have to be limited in radiating the power in up and down links. The analysis proposes power limits and constraints for both of the satellite systems for smooth and interference communications in both directions

关键词： Radiofrequency interference Radio frequency Satellite broadcasting Artificial satellites Interchannel interference Asia Australia Africa Conference proceedings computer networks

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Facial Visualization for Robotic Indicator by using Fuzzy Emotional System

Facial Visualization for Robotic Indicator by using Fuzzy Em...

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SICE Annual Conference

作者： Tuanjai Archevapanich Boonchana Purahong Mongkom Klingajay Pitikhate Sooraksa Electronic and Telecommunication Division Rajamagala University of Technology Suvamabhumi Nonthaburi Nonthaburi Thailand Information Engineering Department Faculty of Engineering King Mongkut''s Institute of Technology Bangkok Thailand Computer Engineering Department Faculty of Engineering Rajamangala University of Technology Thanyaburi Pathum Thani Thailand Computer Engineering Department Faculty of Engineering King Mongkut''s Institute of Technology Bangkok Thailand

The issue of this paper is to show working status of a robot in the form of face emotion which shows the creation of fuzzy emotion generator. This fuzzy emotion generator uses Takagi-Sugeno (TS) fuzzy system to process input data from heat sensors on CPU and batter indicator into emotional output of a robot for visualization. The visualization system that was built can completely show robot's emotions. The experimental results show the advantages of the application of fuzzy system in presenting the output and its advantages are natural continuation which is the result of successful implementation

关键词： Fuzzy systems Robot sensing systems Data visualization Temperature Takagi-Sugeno model Sensor systems Thermal sensors Modems Batteries Inference algorithms

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PATLIS: Fast and reliable backpropagation based learning algorithm using Parallel Tangent and heuristic Line Search

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WSEAS Transactions on computers 2006年第9期5卷 2098-2105页

作者： Moallem, Payman Mirzaeian, Behzad Monadjemi, S. Amirhassan Ashourian, Mohsen Department of Electronic Engineering Faculty of Engineering University of Isfahan Hezarjarib Avenue Isfahan 81746 Iran Department of Computer Engineering Faculty of Engineering University of Isfahan Hezarjarib Avenue Isfahan 81746 Iran Department of Information Technology Engineering Faculty of Engineering University of Isfahan Hezarjarib Avenue Isfahan 81746 Iran

As a gradient based optimization algorithm, we introduce PATLIS (PArallel Tangent and heuristic LIne Search) optimization method that can be used as a learning algorithm for MLP neural networks. In typical gradient based learning algorithms, the momentum rate has usually an improving effect in convergence rate and decreasing the zigzagging phenomena. However it sometimes causes the convergence rate to decrease. The Parallel Tangent (ParTan) gradient can be used as deflecting method to improve the convergence. From the implementation point of view, it is as simple as the momentum. In fact this method is one of the more practical implementation of conjugate gradient. ParTan tries to overcome the inefficiency of zigzagging phenomena of conventional backpropagation by deflecting the gradient through acceleration phase. In this paper, we use two learning rates, η for gradient search direction and μ for accelerating direction through parallel tangent. Moreover, a heuristic line search based on an improved version of dynamic self adaptation of η and μ is used to improve the proposed learning method. In dynamic self adaptation, each learning rate is adapted locally to the cost function landscape and the previous learning rate. Finally we test the proposed algorithm for optimizing Rosenbrock function and for various MLP neural networks including a XOR 2×2×1, Encoder 16×4×16 and finally Parity 4×4×1. We compare the results with those of the dynamic self adaptation of gradient learning rate and momentum (DSη-α) and parallel tangent with dynamic self adaptation (PTDSη-μ). Experimental results for optimizing Rosenbrock function for the first 100 iterations of executions showed the convergence speed of PATLIS is very faster than the other tested methods. Furthermore for MLP problems, the experimental results showed that the average numbers of epochs for PATLIS respect to PTDSη-μ and DSη-α were decreased to around 50% and 66% respectively. Our proposed algorithm also shows a good

关键词： Adaptive systems

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Mobile path loss prediction model for forest areas using MIMO fuzzy logic system

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WSEAS Transactions on Communications 2006年第9期5卷 1807-1812页

作者： Phaiboon, Supachai Phokharatkul, Pisit Kittitummawong, Piti Somkuarnpanit, Suripon Electrical Engineering Department Faculty of Engineering Mahidol University Phutthamonthon Nakornprathom 73170 Thailand Computer Engineering Department Faculty of Engineering Mahidol University Phutthamonthon Nakornprathom 73170 Thailand Information Technology Management Program Faculty of Engineering Mahidol University Phutthamonthon Nakornprathom 73170 Thailand Electronic Department Faculty of Engineer KinkMonkul Institute of Technology Ladkrabang Ladkrabang Bangkok Thailand

This paper proposes a method to predic mobile path loss in forests using MIMO fuzzy logic system. The multi-input was classified into seven input parameters defined as, X1 is number of trees/m2 and X2 to X7 are tree structure parameters. These crisp inputs are classified by fuzzifier to fuzzy sets and then inferenced using fuzzy linguistic rule base into multi - output path loss slopes via de-fuzzifier. For this study, we classified the terrains into high-, medium-, low- density and grass area and used the simple linguistic rules for prediction the path loss slopes. We performed measurements in different forest densities at a frequency of 1.8 GHz with base station antenna height in a range of 3, 4, and 5 m above ground while the receiving antenna height was fixed at 1.8 m above ground. The results have shown that fuzzy logic approach provides more accurate prediction of path loss slopes than that of conventional empirical mathematic model. The proposed models will be useful for the local wireless network and micro-cell design of mobile communication systems in forests.

关键词： Signal interference

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A Subregion Expansion Method for Computational Electromagnetics

A Subregion Expansion Method for Computational Electromagnet...

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International Conference on Magnetics (INTERMAG)

作者： D. Chen K. Shao X. Hu Y. Guo J. Lavers College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei China Faculty of Engineering University of Technology Sydney NSW Australia Department of Electrical and Computer Engineering University of Toronto Toronto ONT Canada

This paper presents a new semi-analytical method for computational electromagnetics. Today, the usual electromagnetic field simulation codes are mainly based on the finite element method (FEM). FEM uses the piecewise low order polynomials to approximate different kind of solution functions. The particular nature of a given problem is not considered, which greatly enhances the method's applicability but depresses the efficiency. In this method, the entire field domain has to be covered with fine mesh, especially in those parts where the field changes sharply, thus requiring a large number of elements (and also unknowns) to calculate the field with sufficient precision. This often makes the codes useless due to the computation cost (CPU time and memory) before some very complex problems. To overcome these limitations, quick and highly efficient techniques are pursued all along. The semi-analytical method is such a direction. The main idea of this scheme is to combine the advantages of both the high efficiency of analytical techniques and the flexibility of numerical methods.

关键词： Computational electromagnetics Laplace equations Electrodes Numerical analysis Physics Electrostatics Educational institutions Australia Electromagnetic fields Computational modeling

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Asynchronous event-based communication across Service Brokers 12

Asynchronous event-based communication across Service Broker...

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12th European Wireless Conference on Enabling Technologies for Wireless Multimedia Communications, European Wireless 2006

作者： Koutsoloukas, E. Kapellaki, S. Prezerakos, G.N. Tselikas, N. Venieris, I.S. Kaklamani, D.I. Intelligent Communications and Broadband Networks Laboratory School of Electrical and Computer Engineering National Technical University of Athens 9 Heroon Polytechneioy str. Zografou Athens Greece Technological Education Institute of Piraeus Faculty of Technology Dpt of Electronic Computing Systems Petrou Ralli and Thivon 250 Athens12244 Greece

ISBN: (纸本)9783800729616

Modern communication environments tend to be complex, dynamic and highly distributed. For the provIsion of messaging in such environments multiple entities, providing different functionalities and located remotely from each other, must cooperate in order to perform different tasks and provide different kind of information for the completion of the service provision Iifecycle. Within this paper we present an implementation analysis of the communication mechanism which was employed in a distributed brokerage framework for the provision of context aware personalized services. The paper focuses on the inter-broker communication mechanism which enables the transparent interaction between components located in different brokers. The mechanism was designed and implemented having in mind relevant requirements such as transparency, modularity and high availability. The design and implementation was based on web service practices and the SOAP protocol.

关键词： Web services

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