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A closed-loop rate-based contention control for optical burst switched networks

A closed-loop rate-based contention control for optical burs...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： F. Farahmand Qiong Zhang J.P. Jue Department of Computer Electronics and Graphics Technology Central Connecticut State University New Britain CT USA Mathematical Sciences and Applied Computing Arizona State University USA Department of Computer Science University of Texas Dallas Richardson TX USA

In this paper we describe a rate-based OBS network architecture in which core switch nodes send explicit messages to edge nodes requesting them to reduce their transmission rate on congested links. Within this framework, we introduce a new contention avoidance mechanism called proportional control algorithm with explicit reduction request (PCwER). Through source rate control, PCwER proactively attempts to prevent the network from entering the congestion state. Basic building blocks and performance trade-offs of PCwER are the main focus of this paper. In addition, through a simple fluid model we analyze the characteristics of the algorithm. Our simulation results show that the proposed contention avoidance techniques improve the network utilization and reduce the packet loss probability

关键词： Optical control Optical fiber networks Optical feedback Optical network units Optical packet switching Optical losses Optical buffering computer networks Optical computing Switches

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Profile Flags: a novel metaphor for probing of T/sub 2/ maps

Profile Flags: a novel metaphor for probing of T/sub 2/ maps

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IEEE Conference on Visualization

作者： M. Mlejnek P. Ermest A. Vilanova R. van der Rijt H. van den Bosch F. Gerritsen M.E. Groller Institute of Computer Graphics and Algorithms University of Technology Vienna Austria Deorlrtment of Biomedical Engineering Technische Universiteit Eindhoven Netherlands Catharina Hospital Eindhovn Netherlands Philips Medical Systems Best Netherlands

This paper describes a tool for the visualization of T/sub 2/ maps of knee cartilage. Given the anatomical scan, and the T/sub 2/ map of the cartilage, we combine the information on the shape and the quality of the cartilage in a single image. The Profile Flag is an intuitive 3D glyph for probing and annotating of the underlying data. It comprises a bulletin board pin-like shape with a small flag on top of it. While moving the glyph along the reconstructed surface of an object, the curve data measured along the pin's needle and in its neighborhood are shown on the flag. The application area of the Profile Flag is manifold, enabling the visualization of profile data of dense but in-homogeneous objects. Furthermore, it extracts the essential part of the data without removing or even reducing the context information. By sticking Profile Flags into the investigated structure, one or more significant locations can be annotated by showing the local characteristics of the data at that locations. In this paper we are demonstrating the properties of the tool by visualizing T/sub 2/ maps of knee cartilage.

关键词： Bones Shape Image reconstruction Lesions Surface reconstruction Switches Visualization USA Councils Osteoarthritis Medical treatment

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Vision pyramids that do not grow too high

Vision pyramids that do not grow too high

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作者： Kropatsch, Walter G. Haxhimusa, Yll Pizlo, Zygmunt Langs, Georg Inst. of Computer Aided Automation Pattern Recog. Image Proc. G. Vienna University of Technology Favoritenstrasse 9 A-1040 Vienna Austria Department of Psychological Sciences Sch. of Elec. and Comp. Engineering Purdue University West Lafayette IN 47907-1364 United States Inst. for Comp. Graphics and Vision Graz University of Technology Inffeldgasse 16 2.OG A-8010 Graz Austria

In irregular pyramids, their vertical structure is not determined beforehand as in regular pyramids. We present three methods, all based on maximal independent sets from graph theory, with the aim to simulate the major sampling properties of the regular counterparts: good coverage of the higher resolution level, not too large sampling gaps and, most importantly, the resulting height, e.g. the number of levels to reach the apex. We show both theoretically and experimentally that the number of vertices can be reduced by a factor of 2.0 at each level. The plausibility of log (diameter) pyramids is supported by psychological and psychophysical considerations. Their technical relevance is demonstrated by enhancing appearance-based object recognition. An irregular pyramid hypothesis generation for robust PCA through top-down attention mechanisms achieves higher speed and quality than regular pyramids and non-pyramidal approaches. © 2004 Elsevier B.V. All rights reserved.

关键词： Object recognition

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Geometric spanners for routing in mobile networks

Geometric spanners for routing in mobile networks

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作者： Gao, Jie Guibas, Leonidas J. Hershberger, John Zhang, Li Zhu, An Department of Computer Science Stanford University Stanford CA 94305 United States Ctr. for the Math. of Information California Institute of Technology Pasadena CA 91125 United States Mentor Graphics Corporation Wilsonville OR 97070 United States Compaq Systems Research Center Palo Alto CA Information Dynamics Laboratory Hewlett Packard Laboratories Palo Alto CA 94304 United States

We propose a new routing graph, the restricted Delaunay graph (RDG), for mobile ad hoc networks. Combined with a node clustering algorithm, the RDG can be used as an underlying graph for geographic routing protocols. This graph has the following attractive properties: 1) it is planar;2) between any two graph nodes there exists a path whose length, whether measured in terms of topological or Euclidean distance, is only a constant times the minimum length possible;and 3) the graph can be maintained efficiently in a distributed manner when the nodes move around. Furthermore, each node only needs constant time to make routing decisions. We show by simulation that the RDG outperforms previously proposed routing graphs in the context of the Greedy perimeter stateless routing (GPSR) protocol. Finally, we investigate theoretical bounds on the quality of paths discovered using GPSR.

关键词： Telecommunication networks

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Economic impact for integrating constructivism, project-based learning and practice into high quality professional graduate education for engineers in industry to enhance corporate advantage and U.S. competitiveness in the global economy

Economic impact for integrating constructivism, project-base...

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2005 ASEE Annual Conference and Exposition: The Changing Landscape of Engineering and technology Education in a Global World

作者： Snellenberger, J.M. Quick, D.H. Tidwell, J.P. O'Brien, J. Davis, T.I. McHenry, A.L. Bardo, J.W. Dunlap, D.D. Deloatch, E.M. Lee, P.Y. Palmer, H.J. Tricamo, S.J. Depew, D.R. Bertoline, G.R. Dyrenfurth, M.J. Keating, D.A. Stanford, T.G. Rolls-Royce Corporation United States Boeing Company United States Hewlett-Packard United States Raytheon Missile Systems United States Arizona State University East United States Western Carolina University United States Morgan State University United States California Polytechnic State University United States Rochester Institute of Technology United States New Jersey Institute of Technology United States Purdue University United States Rolls-Royce Corporation Indianapolis IN United States ASEE Corporate Members Council United States Allison Advanced Development Company Rolls-Royce Corporation Indianapolis IN United States Boeing Company Meza AN United States Hewlett-Packard Company Palo Alto CA United States Raytheon Missile Systems Tucson AZ United States College of Technology and Applied Sciences Arizona State University East United States Department of Engineering and Technology Western Carolina University United States ASEE Graduate Studies Division School of Engineering Morgan State University United States ASEE College of Engineering California State Polytechnic University United States Kate Gleason College of Engineering Rochester Institute of Technology United States Department of Industrial and Manufacturing Engineering College of Technology Purdue University United States Discovery Resources Envision Center Department of Computer Graphics College of Technology Purdue University United States Department of Graduate Studies College of Technology Purdue University United States Department of Mechanical Engineering University of South Carolina United States Department of Chemical Engineering University of South Carolina United States

This is the fourth of four papers prepared for a special panel session of the National Collaborative Task Force on Engineering Graduate Education Reform focusing on new educational approaches and processes that better meet the development needs of the U.S. engineering workforce in industry to enhance global competitiveness. Further graduate development of the U.S. engineering workforce in industry is critical to the continuous improvement, invention, development, and innovation of new technology which is the engine for U.S. economic prosperity and competitiveness. This paper focuses on a unique model for workforce development that represents a significant advancement in professional graduate education extending through the professional masters, professional doctorate and fellow levels of engineering practice. This advancement in professional graduate education forms a new partnership for university-industry engagement for U.S. engineering workforce development that completes a missing piece of the process to better enable U.S. technological innovation which is long overdue. The impact of project-based learning on industrial innovation is evidenced. This model is designed specifically to support the on-site engineering process for continuous improvement and innovation in industry. It purposefully integrates postgraduate professional education for industry's employed engineers with on-site technology development projects that are chosen to be directly relevant to industry's continuous innovation needs and high-end engineering projects. The returns for enhanced corporate advantage generated through this unique model are measured as a matrix of increasing complexity of economic worth of on-site projects and of increasing human proficiency gained for leadership of technological innovation.

关键词： Learning systems

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Label number maximization in the slider model

Label number maximization in the slider model

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12th International Symposium on Graph Drawing, GD 2004

作者： Ebner, Dietmar Klau, Gunnar W. Weiskircher, René Institute of Computer Graphics and Algorithms Vienna University of Technology

We consider the NP-hard label number maximization problem LNM: Given a set of rectangular labels, each of which belongs to a point feature in the plane, the task is to find a labeling for a largest subset of the labels. A labeling is a placement such that none of the labels overlap and each is placed so that its boundary touches the corresponding point feature. The purpose of this paper is twofold: We present a new force-based simulated annealing algorithm to heuristically solve the problem and we provide the results of a very thorough experimental comparison of the best known labeling methods on widely used benchmark sets. The design of our new method has been guided by the goal to produce labelings that are similar to the results of an experienced human performing the same task. So we are not only looking for a labeling where the number of labels placed is high but also where the distribution of the placed labels is good. Our experimental results show that the new algorithm outperforms the other methods in terms of quality while still being reasonably fast and confirm that the simulated annealing method is well-suited for map labeling problems. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Problem solving

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Towards multiscale mesh denoising 04

Towards multiscale mesh denoising

引用

Spring Conference on computer graphics, SCCG 2004

作者： Grabner, Markus Institute for Computer Graphics and Vision Graz University of Technology Austria

ISBN: (纸本)1581139144

Recently developed methods address the problem of denoising polygonal meshes derived from automatic scanning procedures. Nonlinear filtering is applied iteratively based on the estimated statistical properties of errors associated with the measured vertex locations. This procedure requires a rather uniform sampling interval across the surface and cannot remove noise below a certain frequency due to the local support of the filter kernel. We consider an approach to remedy these problems by interleaving mesh denoising and mesh simplification based on the quadric error metric. Instead of directly operating on vertex locations, the error quadrics (which are evaluated to determine vertex locations) are manipulated. Therefore denoising is applied at different scales according to the progress of simplification, being less sensitive to varying resolution and low-frequency noise. This is work in progress, which reveals some interesting properties in the context of denoising and simplification. However, the desired results have not yet been achieved. Copyright © 2004 by the Association for Computing Machinery, Inc.

关键词： computer graphics

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GPU-based frequency domain volume rendering

GPU-based frequency domain volume rendering

引用

Spring Conference on computer graphics, SCCG 2004

作者： Viola, Ivan Kanitsar, Armin Gröller, Meister Eduard Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)1581139144

Frequency domain volume rendering (FVR) is a volume rendering technique with lower computational complexity as compared to other techniques. In this paper the FVR algorithm is accelerated by factor of 17 by mapping the rendering stage to the GPU. The overall hardware-accelerated pipeline is discussed and the changes according to previous work are pointed out. The three-dimensional transformation into frequency domain is done in a pre-processing step. The rendering step is computed completely on the GPU. First the projection slice is extracted. Four different interpolation schemes are used for resampling the slice from the data represented by a 3D texture. The extracted slice is transformed back into the spatial domain using the inverse Fast Fourier or Fast Hartley Transform. The rendering stage is implemented through shader programs running on programmable graphics hardware achieving highly interactive framerates. Copyright © 2004 by the Association for Computing Machinery, Inc.

关键词： Frequency domain analysis

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Reconstruction with 3D geometric bilateral filter

Reconstruction with 3D geometric bilateral filter

引用

Ninth ACM Symposium on Solid Modeling and Applications, SM'04

作者： Miropolsky, A. Fischer, A. Laboratory for Computer Graphics CAD Technion -Israel Institute of Technology Haifa Israel

In recent years, reverse engineering (RE) techniques have been developed for surface reconstruction from 3D scanned data. Typical sampling data, however, usually is large scale and contains unorganized points, thus leading to some anomalies in the reconstructed object. To improve performance and reduce processing time, Hierarchical Space Decomposition (HSD) methods can be applied. These methods are based on reducing the sampled data by replacing a set of original points in each voxel by a representative point, which is later connected in a mesh structure. This operation is analogous to smoothing with a simple low- pass filter (LPF). Unfortunately, this principle also smoothes sharp geometrical features, an effect that is not desired. The high performance results of bilateral filtering for removing noise from 2D images while preserving details motivated us to extend this filtering and apply it to 3D scan points. This paper introduces anisotropic 3D scan point filtering, which we have defined as 3D Geometric Bilateral Filtering (GBF). The proposed GBF method smoothes low curvature regions while preserving sharp geometric features, and it is robust, simple and fast.

关键词： Image reconstruction

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Framework for integrating project-based learning, experience and practice in professional graduate education for engineering leaders in industry leading to the professional engineering doctorate and fellow levels

Framework for integrating project-based learning, experience...

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2005 ASEE Annual Conference and Exposition: The Changing Landscape of Engineering and technology Education in a Global World

作者： Keating, Donald A. Stanford, Thomas G. Dunlap, Duane D. McHenry, Albert L. Deloatch, Eugene M. Lee, Peter Y. Depew, Dennis R. Bertoline, Gary R. Dyrenfurth, Michael J. Tricamo, Stephen J. Palmer, Harvey J. Davis, Isadore T. Morrison, Ray E. Tidwell, Joseph P. Gonzalez-Landis, Kathleen O'Brien, Joe Snellenberger, Jay M. Quick, David H. Olson, Roger N. Coulson, Lynda M. University of South Carolina United States Western Carolina University United States Arizona State University East United States Morgan State University United States California Polytechnic State University United States Purdue University United States New Jersey Institute of Technology United States Rochester Institute of Technology United States Raytheon Missile Systems United States Lockheed-Martin Company United States Boeing Company United States Engineering Partnership-Arizona United States Hewlett-Packard United States Rolls-Royce Corporation United States ASEE-Graduate Studies Division United States Department of Chemical Engineering University of South Carolina United States Department of Engineering and Technology Western Carolina University United States College of Technology Andapplied Sciences Arizona State University East United States School of Engineering Morgan State University United States College of Engineering California State Polytechnic University United States College of Technology Purdue University United States Discovery Resources Envision Center Department of Computer Graphics College of Technology Purdue University United States Department of Industrial and Manufacturing Engineering Kate Gleason College of Engineering Rochester Institute of Technology United States Engineering University Relations Raytheon Missile Systems Tucson AZ United States ASEE Corporate Members Council Lockheed Martin Aero Technical Institute and Engineering Workforce Development Lockheed Martin Aeronautics Company Fort Worth TX United States ASEE-Continuing Professional Development Division Southwest Regional University United States Engineering and Technical Education Boeing Company Meza AZ United States Hewlett-Packard Company Palo Alto CA United States Rolls-Royce Corporation Indianapolis IN United States R and D Customer Requirements Allison Advanced Development Company Rolls-Royce Corporation Indianapolis IN United States Lockheed Martin Aero Technica

This is the third of four papers prepared for a special panel session of the National Collaborative Task Force on Engineering Graduate Education Reform. The paper formulates a very creative approach and framework for postgraduate professional education that fosters the continuous development of the U.S. engineering workforce in industry concurrently with engineering practice for technological innovation. The framework integrates innovative project-based learning, progressive experience, self-directed learning, and graduate studies concurrently with engineering practice. The framework is specifically designed to foster growth beyond the professional master's level, leading to the professional Doctor of Engineering and Engineering Fellow for senior career development of engineering leaders. The intent is to build clusters of postgraduate professional education across the country in partnership with industry that strengthens U.S. innovative capability for continuous technology development and competitiveness.

关键词： Engineering education

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