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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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A Theoretical Analysis of combination of M/M/n and M/M/n/N for Mobile Cellular Network

A Theoretical Analysis of combination of M/M/n and M/M/n/N f...

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International Conference on Information and Communication Technologies: From Theory to Applications, ICTTA

作者： Md.I. Islam Md.S. Karim A.B.M.S. Hossain Faculty Department of Computer Science and Engineering Jahangir Nagar University Savar Bangladesh Motorola Inc. Dhaka Bangladesh Department of Electrical and Electronic Engineering University of Engineering and Technology Dhaka Bangladesh

Most impressive features of mobile cellular communication network are frequency reuse and handover. In any cell two types of arrival, new originating call and handoff call from surrounding cells. These two arrivals follow two different types of traffic hence any cell in network experiences mixed traffic. This paper deals with mixed traffic of a cell based on Markovian chain with numerical example. Finally mathematical expression of probability state and call blocking is derived from two-dimensional state transition diagram to validate the result

关键词： Land mobile radio cellular systems Telecommunication traffic Traffic control Cellular networks Communication networks Equations Postal services Switches Frequency Satellites

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Sequential Learning Methods on RBF with Novel Approach of Minimal Weight Update

Sequential Learning Methods on RBF with Novel Approach of Mi...

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IEEE Nonlinear Statistical Signal Processing Workshop,NSSPW

作者： Vijanth S. Asirvadam Sean F. McLoone Asian Institute for Medicine Science and Technology Malaysia Faculty of Engineering and Computer Technology Asian Institute of Medicine Science and Technology Kedah Darul Aman Malaysia Department of Electronic Engineering National University of Ireland Maynooth Republic of Ireland

This paper investigates sequential learning method with new form of weight update applied on a decomposed form of training algorithms using Radial Basis Function (RBF) network. Adding each basis function to the hidden layer during the course of training facilitate the weight update to be decomposed on neuron by neuron basis. A new form weight update is introduced where the weight update is based on minimal displacement of the current input elements to the elements of the nearest centre of the Gaussian neuron.

关键词： Learning systems Neurons Radio access networks Radial basis function networks Vectors computer networks Sampling methods Frequency Kernel Resource management

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Implementing executable graph based visual language in a distributed environment

Implementing executable graph based visual language in a dis...

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International Conference on Computing & Informatics (ICOCI)

作者： Kamal Z. Zamli Nor Ashidi Mat Isa Norazlina Khamis School of Electrical and Electronic University Science Malaysia Engineering Campus Nibong Tebal Penang Malaysia Faculty of Computer Science and Information Technology University of Malaya Kuala Lumpur Malaysia

One of the common difficulties in a graph based visual language is to develop its executable semantics and achieved its execution in a distributed environment. In order to address some of these issues, this paper outlines the general control flow semantics of a graph based visual language. In doing so, this paper also discusses a sound technique implementing such semantics permitting execution in a distributed environment. An implementation is sketched for a domain specific graph based visual language, called VRPML.

关键词： computer languages computer science Flowcharts Instruction sets Information technology Counting circuits Distributed computing computer graphics Silver Systems engineering and theory

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