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A Subregion Expansion Method for Computational Electromagnetics

A Subregion Expansion Method for Computational Electromagnet...

引用

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...

引用

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...

引用

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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Call admission scheme of voice data integrated traffic of mobile cellular network under DCA environment

Call admission scheme of voice data integrated traffic of mo...

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IFIP International Conference on Wireless and Optical Communications Networks (WOCN)

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

In this paper, we propose a call admission control scheme for mobile cellular network. The proposed scheme is based upon the dynamic channel allocation (DCA) mechanism, where a cell is allowed to borrow the unused channels of its surrounding cells and it's done when all the nominal channels are already occupied by the traffic. In the paper, we consider a multi-service system that supports voice/data integrated service. All the nominal channels provide services to different traffic types and when these channels are fully utilized by the mixed traffic, the borrowing of channel is done under the DCA environment. In this scheme, the borrowed channels are assigned to provide services to handoff calls only. Here we analyze the proposed scheme based on Markovian chain. Our analysis reveals the fact that the proposed scheme greatly reduces forced termination due to handoffs ensuring the better QoS in a mobile cellular network

关键词： Telecommunication traffic Land mobile radio cellular systems Call admission control Communication system traffic control Quality of service Bandwidth Mobile communication Switches Channel allocation Intserv networks

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Modeling of random access channel for limited user network

Modeling of random access channel for limited user network

引用

IFIP International Conference on Wireless and Optical Communications Networks (WOCN)

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

ALOHA based random multiple access schemes have been in use for some time as access control protocol in mobile network. In pure and slotted ALOHA system random access technique is modeled considering Poisson's arrival traffic. In case of small network, users and also the coverage area are limited. Hence limited users traffic model is pertinent for such network. In the paper performance parameters of a limited user network have been exclusively studied. This paper will depict an analysis of probability of successful capture of packet, blocking probability and throughput for a limited source random access channel network

关键词： Traffic control Telecommunication traffic Land mobile radio cellular systems Mobile communication Switches Communication system traffic control Throughput Wireless communication Switching circuits Packet switching

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Simulation of the Generation and Processing of Doppler Ultrasound Fetal Heart Signals to obtain Directional Motion Information

Simulation of the Generation and Processing of Doppler Ultra...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： W. Mansor J A Crowe M. Woolfson B R Hayes-Gill P. Blanchfield M. Bister Faculty of Electrical Engineering University of Teknologi MARA Shah Alam Selangor Darul Ehsan Malaysia School of Electrical & Electronic Engineering University of Nottingham Nottingham UK School of Computer Science and Information Technology University of Nottingham Nottingham UK Faculty of Engineering & Computer Science University of Nottingham Semanyih Selangor Darul Ehsan Malaysia

In fetal heart monitoring using Doppler ultrasound signals the cardiac information is commonly extracted from non-directional signals. As a consequence often some of the cardiac events cannot be observed clearly which may lead to the incorrect detection of the valve and wall motions. Here, directional signals were simulated to investigate their enhancement of cardiac events, and hence provide clearer information regarding the cardiac activities. First, fetal Doppler ultrasound signals were simulated with signals encoding forward and reverse motion then obtained using a pilot frequency. The simulation results demonstrate that the model has the ability to produce realistic Doppler ultrasound signals and a pilot frequency can be used in the mixing process to produce directional signals that allow the simulated cardiac events to be distinguished clearly and correctly

关键词： Signal generators Ultrasonic imaging Fetal heart Signal processing Discrete event simulation Frequency Data mining Event detection Motion detection Valves

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Time-significant Wavelet Coherence for the Evaluation of Schizophrenic Brain Activity using a Graph theory approach

Time-significant Wavelet Coherence for the Evaluation of Sch...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Vangelis Sakkalis Theofanis Oikonomou Ellie Pachou Ioannis Tollis Sifis Micheloyannis Michalis Zervakis Department of Electronic and Computer Engineering Technical University of Crete Chania Greece Institute of Computer Science Foundation for Research and Technology Hellas Heraklion Greece Department of Computer Science University of Crete Heraklion Greece Clinical Neurophysiology Laboratory Faculty of Medicine University of Crete Heraklion Greece

Among the various frameworks in which electroencephalographic (EEG) signal synchronization has been traditionally formulated, the most widely studied and used is the coherence that is entirely based on frequency analysis. However, at present time it is possible to capture information about the temporal profile of coherence, which is particularly helpful in studying non-stationary time-varying brain dynamics, like the wavelet coherence (WC). In this paper we propose a new approach of studying brain synchronization dynamics by extending the use of WC to include certain statistically significant (in terms of signal coherence) time segments, to study and characterize any disturbances present in the functional connectivity network of schizophrenia patients. Graph theoretical measures and visualization provide the tools to study the "disconnection syndrome" as proposed for schizophrenia. Specifically, we analyzed multichannel EEG data from twenty stabilized patients with schizophrenia and controls in an experiment of working memory (WM) using the gamma band (i.e., the EEG frequency of ca. 40 Hz), which is activated during the connecting activity (i.e., the "binding" of the neurons). The results are in accordance with the disturbance of connections between the neurons giving additional information related to the localization of most prominent disconnection

关键词： Coherence Brain Graph theory Electroencephalography Frequency synchronization Optical wavelength conversion Neurons Signal analysis Data visualization Data analysis

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Communication Architecture Design for Real-Time Networked Control Systems

Communication Architecture Design for Real-Time Networked Co...

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International Conference on Communications, Circuits and Systems (ICCCAS)

作者： Yu-chu Tian Qing-long Han Colin Fidge Moses O. Tade Tianlong Gu Faculty of Information Technology Queensland University of Technology Brisbane QLD Australia Faculty of Business and Informatics Central Queensland University Rockhampton Qld Australia Department of Chemical Engineering Curtin University of Technology Perth WA Australia School of Computer Science Guilin University of Electronic Technology Guilin P. R. China

Networked control over data networks has received increasing attention in recent years. Among many problems in networked control systems (NCSs) is the need to reduce control latency and jitter and to deal with packet dropouts. This paper introduces our recent progress on a queuing communication architecture for real-time NCS applications, and simple strategies for dealing with packet dropouts. Case studies for a middle-scale process or multiple small-scale processes are presented for TCP/IP based real-time NCSs. Variations of network architecture design are modelled, simulated, and analysed for evaluation of control latency and jitter performance. It is shown that a simple bandwidth upgrade or adding hierarchy does not necessarily bring benefits for performance improvement of control latency and jitter. A co-design of network and control is necessary to maximise the real-time control performance of NCSs

关键词： Real time systems Networked control systems Communication system control Delay Jitter Control systems TCPIP Analytical models Performance analysis Bandwidth

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