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Wireless Telecommunications Symposium, WTS

作者： Fumio Ishizaki Gang Uk Hwang Department of Mathematics and Telecommunication Mathematics Korea University South Korea Division of Applied Mathematics and Telecommunication Engineering Program Korea Advanced Institute of Science and Technology

In this paper, we consider a joint scheduling algorithm which is a combination of Knopp and Humblet (KH) scheduling, which fully exploits multiuser diversity, and round-robin (RR) scheduling, which does not use multiuser diversity at all. By assuming that the wireless channel process for each user is described by Gilbert-Elliot channel model, we develop a formula to estimate the tail distribution of packet delay for an arbitrary user under the joint scheduling. Numerical results exhibit that under the joint scheduling; the ratio of the number of slots assigned for the RR scheduling to that for the KH scheduling dominates the delay performance

关键词： Delay estimation Scheduling algorithm Probability distribution Wireless networks Telecommunication traffic mathematics Fading Throughput Predictive models Performance analysis

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Guest editorial nonlinear optimization of communication systems

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IEEE Journal on Selected Areas in Communications 2006年第8期24卷 1421-1423页

作者： Chiang, Mung Low, Steven H. Luo, Zhi-Quan Shroff, Ness B. Yu, Wei Steenstrup, M. Princeton University Department of Electrical Engineering Program in Applied and Computational Mathematics Princeton NJ 08544 United States California Institute of Technology Department of Computer Science Pasadena CA 91125 United States University of Minnesota Department of Electrical and Computer Engineering Minneapolis MN 55455 United States Purdue University School of Electrical and Computer Engineering West Lafayette IN 47907 United States University of Toronto Edward S. Rogers Sr. Department of Electrical and Computer Engineering Toronto Ont. M4S 3G5 Canada

No abstract available

关键词： Communication systems Design optimization Communication system control Optimization methods Protocols Distributed algorithms Power system modeling Nonlinear control systems Lagrangian functions Surges

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Analysis of EEG images

Analysis of EEG images

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2005 7th International Workshop on Mathematical Methods on Scattering Theory and Biomedical engineering

作者： Dassios, George Giapalaki, Sofia N. Kandili, Anastasia N. Kariotou, Fotini Division of Applied Mathematics Department of Chemical Engineering University of Patras GR - 265 04 Patras Greece High Performance Information Systems Laboratory Department of Computer Engineering and Informatics University of Patras GR - 265 04 Patras Greece DAMTP University of Cambridge Cambridge CB3 OWA United Kingdom

ISBN: (纸本)9812568603

The electric potential of the direct Electroencephalography (EEG) problem is presented for the case of a homogeneous sphere, when this is given both in closed form - exact solution - and in terms of spherical harmonics - approximate solution. The model in both cases involves a sphere with constant conductivity, where the source is considered to be a point current dipole. Data distribution of the electrical potential on the head surface is produced for both cases. The presentation includes a parametric analysis based on the location as well as on the orientation of the moment, for a single current dipole. A detailed comparison between the exact and the approximate solution is also included. © 2006 World Scientific Publishing Co. Pte. Ltd.

关键词： Spheres

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Reducing complexity in parallel algebraic multigrid preconditioners

Reducing complexity in parallel algebraic multigrid precondi...

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作者： De Sterck, Hans Yang, Ulrike Meier Heys, Jeffrey J. Department of Applied Mathematics University of Waterloo Waterloo Ont. N2L 3G1 Canada Center for Applied Scientific Computing Lawrence Livermore National Laboratory PO Box 808 Livermore CA 94551 Chemical and Materials Engineering Department Box 876006 Arizona State University Tempe AZ 85287-6006

Algebraic multigrid (AMG) is a very efficient iterative solver and preconditioner for large unstructured sparse linear systems. Traditional coarsening schemes for AMG can, however, lead to computational complexity growth as problem size increases, resulting in increased memory use and execution time, and diminished scalability. Two new parallel AMG coarsening schemes are proposed that are based solely on enforcing a maximum independent set property, resulting in sparser coarse grids. The new coarsening techniques remedy memory and execution time complexity growth for various large three-dimensional (3D) problems. If used within AMG as a preconditioner for Krylov subspace methods, the resulting iterative methods tend to converge fast. This paper discusses complexity issues that can arise in AMG, describes the new coarsening schemes, and examines the performance of the new preconditioners for various large 3D problems. © 2006 Society for Industrial and applied mathematics.

关键词： Computational complexity

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Preliminary results of Carbon Budget in two hydroelectric reservoirs in Brazil

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International Symposium on Dams in the Societies of the 21st Century, ICOLD-SPANCOLD - Dams and Reservoirs, Societies and Environment in the 21st Century

作者： Dos Santos, M.A. Matvienko, B. Pinguelli Rosa, L. Oliveira Dos Santos, E. Sikar, E. Eça D'Almeida Rocha, C.H. Santos Costa, R. Bento Silva, M. Rao Patchineelam, S. Portilho Bentes Jr., A.M. Energy Planning Program COPPE UFRJ Rio de Janeiro Brazil Unigranrio Rio de Janeiro Brazil Center of Applied Ecology and Hydraulics USP São Carlos Brazil Construmaq São Carlos São Carlos Brazil Civil Engineering Program COPPE UFRJ Rio de Janeiro Brazil Geochemical Department UFF Rio de Janeiro Brazil Chemistry of Chemical Engineering Program COPPE UFRJ Rio de Janeiro Brazil

ISBN: (纸本)0415404231

Pioneering studies were carried out in relation to greenhouse gas emissions from the conversion of forests and agricultural land to hydroelectric reservoirs and its relationship with greenhouse gas emissions. COPPE/UFRJ team has been carrying out several studies on greenhouse gases emissions by hydropower plants. This paper has been presented to show the preliminary results of two reservoirs studied by COPPE/UFRJ in the Carbon Budget Project of Furnas Centrais Elétricas S.A. This project has been developed to identify the carbon cycle pathways and related environmental aspects. The objective of COPPE team in this project is measure flux estimates of CO2, CH4 e N2O in the water-atmosphere interface and water column as well as the determination of incoming carbon and sedimentation rates. Here the results of three field trips are presented for two reservoirs, Serra da Mesa and Manso. © 2006 Taylor & Francis Group.

关键词： Carbon

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Orientation Dependence of Strained-Ge Surface Energies near (001): Role of Dimer-Vacancy Lines and Their Interactions with Steps

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Physical Review Letters 2006年第12期96卷 126101-126101页

作者： C. J. Moore C. M. Retford M. J. Beck M. Asta M. J. Miksis P. W. Voorhees Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Engineering Sciences and Applied Mathematics Northwestern University Evanston Illinois 60208 USA Department of Physics and Astronomy Vanderbilt Univesity Nashville Tennessee 37235 USA Department of Chemical Engineering and Material Sciences University of California Davis California 95616 USA

Recent experiments and calculations have highlighted the important role of surface-energy (γ) anisotropy in governing island formation in the Ge/Si(001) system. To further elucidate the factors determining this anisotropy, we perform atomistic and continuum calculations of the orientation dependence of γ for strained-Ge surfaces near (001), accounting for the presence of dimer-vacancy lines (DVLs). The net effect of DVLs is found to be a substantial reduction in the magnitude of the slope of γ vs orientation angle, relative to the highly negative value derived for non-DVL, dimer-reconstructed, strained-Ge(001) surfaces. The present results thus point to an important role of DVLs in stabilizing the (001) surface orientation of a strained-Ge wetting layer.

关键词： .week ending important role governing Orientation Dependence Surface Energies Dimer-Vacancy island formation DVLs surface orientation

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Work in Progress: Developing an Online Textbook and Research Tool for Freshman engineering Design

Work in Progress: Developing an Online Textbook and Research...

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Frontiers in Education (FIE) Conference

作者： Linda Lindsley Veronica Burrows Science and Engineering if Materials Program Arizona State University Tempe USA Center for Research on Education in Science MathematicsEngineering and Technology and Department of Chemical and Materials Engineering Arizona State University Tempe USA

This paper explores the development of and pilot study done on an online textbook and research tool, based on the book, "how to model it", by Starfield, Smith and Bleloch. In many engineering design texts, the solution(s) to design problems are provided in the pages following the proposed problem. With this online system, students are able to read only a portion of the text, and then must complete one or more tasks for which they submit a response to the system. This approach forces the students to begin practicing the engineering design process, rather than simply reading about someone else's design process. As a research tool, the computerized method of data gathering addresses the issue of increasing sampling frequency without much larger investment in research time, as no transcription is required. The small pilot study showed students' responses included data on their design process thinking as well as their proposed solution to the problems

关键词： Design engineering Process design Information analysis engineering education Monitoring Equations Books Sampling methods Frequency Investments

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System-structural approach to heat-exchange processes in a solar collector

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Environment Protection engineering 2006年第1期32卷 109-115页

作者： Zuyeva, G.A. Magiera, J. Lukyanchikova, N.V. Kokurina, G.N. Ivanovo State University of Chemistry and Technology Faculty of Chemical Engineering and Cybernetics Department of Applied Mathematics 7 Engelsa str. 153 000 Ivanovo Russia Institute of Chemical and Process Engineering Cracow University of Technology ul. Warszawska 24 31-155 Kraków Poland

To simulate adequately the process of heat exchange taking place in a solar collector, structural scheme of heat transfer in the collector wall has been developed. Structural model of heat exchange, which is visualization of the interaction and transformation of heat flows both on the boundary and inside a plate, has been built based on the solution of the task of thermal conductivity of the plate with boundary conditions of the third type and due account of internal sources of heat induced by IR irradiation. The model makes it possible to identify thermal-physical parameters.

关键词： Heat exchangers

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General polarizability tensor for two spheres

General polarizability tensor for two spheres

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2005 7th International Workshop on Mathematical Methods on Scattering Theory and Biomedical engineering

作者： Dassios, George Hadjinicolaou, Maria Kamvyssas, Gregory Division of Applied Mathematics Department of Chemical Engineering University of Patras GR - 265 04 Patras Greece School of Science and Technology Hellenic Open University 167 R. Fereou str. GR -262 22 Patras Greece Technological Educational Institute of Patras Greece DAMTP University of Cambridge Cambridge CB3 OWA United Kingdom

ISBN: (纸本)9812568603

The General Polarizability Tensor for two spheres of different radii is defined in terms of a vector potential, which solves an appropriate transmission problem. This problem is solved through the use of bispherical coordinates and the vector potential is expressed as a series expansion. The exact solution, in terms of exponential and hyperbolic functions, leads to an infinite linear system, which can be solved approximately through cut off methods. © 2006 World Scientific Publishing Co. Pte. Ltd.

关键词： Hyperbolic functions

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Analysis of Max-Product via Local Maxifiers

Analysis of Max-Product via Local Maxifiers

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IEEE International Symposium on Information Theory

作者： Stephan Winkler Sekhar Tatikonda David Pollard Program in Applied Mathematics Yale University New Heaven CT USA Department of Electrical Engineering Yale University New Heaven CT USA Department of Statistics Yale University New Heaven CT USA

ISBN: (纸本)142440505X

In this paper we study convergence of the max-product (MP) algorithm on general graphs with cycles. Our analysis follows analogously to that given for the convergence of the sum-product algorithm. We do not work with Gibbs measures but instead we introduce and work with local maxifiers. The contributions of this paper include: reformulation of the MP algorithm on cyclic graphs as max-marginalization on an associated computation tree; existence of local maxifiers and proof that uniqueness of the local maxifier is sufficient for convergence of MP; a Gibbsian theory of local maxifiers and interpretation as operators; an example of non-uniqueness which does not exhibit a phase transition like its Gibbs measure counterpart; and insights into the limitations of Dobrushin-type uniqueness conditions

关键词： Algorithm design and analysis Convergence mathematics Statistical analysis Error correction codes Equations Sum product algorithm Tree graphs Phase measurement Bipartite graph

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