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User-Level Virtual Network Support for Sky computing

User-Level Virtual Network Support for Sky Computing

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IEEE International Conference on e-Science and Grid computing

作者： Maurício Tsugawa Andréa Matsunaga José Fortes Advanced Computing and Information Systems Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

With the emergence of multiple cloud providers of Infrastructure-as-a-Service, it becomes possible to envision a near-future when high-performance computing users could combine services from different clouds to access huge numbers of resources. However, as more administrative privileges are exposed to end users, providers are required to deploy network security measures that present challenges to the network virtualization technologies that are needed to enable inter-cloud communication. This paper studies these challenges and proposes techniques to enable unmodified applications on resources across distinct clouds. The techniques are implemented in TinyViNe, an extension to ViNe, a virtual networking technology for distributed resources in different administrative domains. The results of evaluating TinyViNe on a WAN-based testbed across three sites are reported for a bioinformatics application (BLAST) and MPI benchmarks. The results confirm that TinyViNe enables cross-cloud computing while having little impact on application performance. TinyViNe also has auto-configuration and ¿download-and-run¿ capabilities for easy deployment by users who are not knowledgeable about networking.

关键词： Computer networks Cloud computing Voice mail Bioinformatics Virtual manufacturing Isolation technology Protection information systems Laboratories USA Councils

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TMT - A TLB Tag Management Framework for Virtualized Platforms

TMT - A TLB Tag Management Framework for Virtualized Platfor...

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International Symposium on Computer Architecture and High Performance computing (SBAC-PAD)

作者： Girish Venkatasubramanian Renato J. Figueiredo Ramesh Illikkal Donald Newell Advanced Computing and Information Systems Laboratory University of Florida Gainesville FL USA Intel Corporation Hillsboro OR USA

The rise in multi-core architectures has led to the abundance of computing resources on a chip. Virtualization has emerged as a way to efficiently partition and share these resources. Thus, the emphasis in micro-architecture design, especially in ×86, has shifted towards providing hardware support for better performance of VMs on bare metal. One of the areas of focus for these efforts is the Translation Lookaside Buffer (TLB). Recent modifications in the TLB include the addition of tags as a part of the TLB entry and the incorporation of hardware primitives to perform tag comparison during TLB lookup. In this paper we present the Tag Manager Table (TMT), a low-latency management architecture for tagging the TLB entries using process-specific identifiers (based on the CR3 register in ×86), and thereby reducing the number of flushes and the miss rate in the TLB. Using a full system simulation approach, we investigate the performance benefit of these tags and explore how it varies with the size of the TMT, the TLB architecture and the workload characteristics. We also perform a sensitivity analysis and quantify the relative importance of all these factors in determining the benefit from CR3 tagging. While our focus is on virtualized platforms, this approach is equally applicable for non virtualized environments.

关键词： Platform virtualization Voice mail Computer architecture Hardware Tagging High performance computing Resource virtualization Resource management Management information systems Laboratories

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A 3-D Traffic Animation System with Storm Surge Response

A 3-D Traffic Animation System with Storm Surge Response

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IEEE International Symposium on multimedia

作者： Yudan Li Kasturi Chatterjee Shu-Ching Chen Keqi Zhang Distributed Multimedia Information Systems Laboratory School of Computing and Information Sciences Florida International University Miami FL USA International Hurricane Research Center Florida International University Miami FL USA

This paper presents a 3D traffic animation system that provides features of vehicle interaction and storm surge response to emulate realistic scenarios in a hurricane affected area. The proposed system constructs road objects based on a series of line segments. Vehicles on the roads are animated by keeping them coherent with the direction of the road segment and adjusting their speeds with respect to one another. The vehicle speed is controlled based upon a collision-circumventing policy and they automatically respond to flood water caused by a storm surge. The system can automatically plant lamp posts along the roads, which also respond to surge flooding. An implementation conducted with the 3D scenes on a couple of south Florida's surge-susceptible areas demonstrates the system's excellence in animating real traffic scenes and impacts of storm surge on coastal regions.

关键词： Animation Storms Surges Floods Layout Hurricanes Road vehicles Marine vehicles Automatic control Water storage

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Ringing artifact removal in digital restored images using multi-resolution edge map

Ringing artifact removal in digital restored images using mu...

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作者： Kim, Sangjin Jun, Sinyoung Lee, Eunsung Shin, Jeongho Paik, Joonki Image Processing and Intelligent Systems Laboratory Graduate School of Advanced Imaging Science Multimedia and Film Chung-Ang University 221 Heuksuk-Dong Dongjak-Ku Seoul 156-756 Korea Republic of Department of Web Information Engineering Hankyong National University 67 Seokjeong-Dong Anseong Kyonggi-Do 456-749 Korea Republic of

ISBN: (纸本)9783642105456

This paper presents a novel approach to reducing ringing artifact in digitally restored images by using multi-resolution edge map. The performance of reducing ringing artifacts depends on the accurate classification of the local features in the image. The discrete wavelet transform (DWT) provides effective insight into both spatial and frequency characteristics of an image. Through the DWT analysis, we show that ringing artifacts can be suppressed to a great extent by using multiple-level edge maps, which provide enhanced matching to local edges. Base on the experimental results, the proposed method can reduce ringing artifacts with minimized edge degradation by using DWT analysis. © 2009 Springer-Verlag Berlin Heidelberg.

关键词： Discrete wavelet transforms

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Knowledge acquisition from corresponding domain knowledge transformations

Knowledge acquisition from corresponding domain knowledge tr...

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IEEE International Conference on information Reuse and Integration (IRI)

作者： Michael Armella Isai Michel Lombera Stuart H. Rubin Shu-Ching Chen Gordon Lee Distributed Multimedia Information Systems Laboratory School of Computing and Information Sciences Florida International University Miami FL USA Department of Electrical & Computer Engineering San Diego State University San Diego CA USA SPAWAR Systems Center San Diego CA USA

The capability to efficiently retrieve knowledge in response to specific user queries offers the potential to create decision support systems of unprecedented utility, i.e., systems which can accelerate the learning process. This paper presents such an architecture, the Type 2 Knowledge Amplification by structured expert randomization (T2K) system. This system differs from traditional expert systems in the way knowledge rules are matched with queries. The T2K has the ability to acquire knowledge from corresponding domains to answer queries from domains in which the system has less knowledge. This system also solves the word mismatch problem by modifying queries using word substitutions. This is done through creative transformations and optimizations of knowledge rule antecedents and consequents. By pairing rules with identical antecedents or consequents, we are able to induce new rules from existing knowledge without explicit elicitation from the user. The technique presented in this paper attempts to transform both the rules in the knowledge base as well as the query in order to find a matching action for a specified query.

关键词： Knowledge acquisition Engines Expert systems Distributed computing Automata Humans multimedia systems multimedia computing information systems Laboratories

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Load balanced multiple gateway support in wireless mesh networks for broadband services

Load balanced multiple gateway support in wireless mesh netw...

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International Conference on Wireless and Optical Communications ( WOCC)

作者： Muddesar Iqbal Xinheng Wang David Wertheim Xu Zhou Faculty of Computing Information Systems &Mathematics Kingston London University Kingston Upon Thames UK Institute of Advanced Telecommunications Swansea University Swansea UK National Laboratory of Radar Signal Processing Xidian University Xi'an China

In this paper, we present our design and implementation of load-balanced gateway discovery routing protocol called LBGD-AODV. A gateway node in a wireless mesh network acts as bridge between mesh routers and external network in order to provide services such as broadband. We observed in our SwanMesh testbed that a single gateway can only serve up to a limited number of hops due to noticeable throughput drop at each hop. LBGD-AODV solves the problem by supporting multiple gateways. Our proposed LBGD-AODV advertises a new gateway to the network by broadcasting a periodic gateway hello control message after every GATEWAY_HELLO_INTERVAL milliseconds. When a gateway hello message travels through the network it helps all mesh nodes on the network to learn more information about the network topology. This information includes hop count to each gateway on the network, load on each gateway and local load on each mesh router. Mesh routers use this information to select an appropriate gateway with an appropriate route to communicate to the external network. Thus apart from the gateway discovery LBGD-AODV performs load balancing using the single process. Test results performed using SwanMesh shows that apart from the multiple gateway environment, load balancing support also increased throughput performance between mesh routers and gateways to external networks.

关键词： Wireless mesh networks Throughput Broadcasting Load management Routing protocols Testing Network topology Computer networks Telecommunication computing information systems

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AViTExt: Automatic video text extraction

AViTExt: Automatic video text extraction

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2008 3rd International Conference on information and Communication Technologies: From Theory to Applications, ICTTA

作者： Bouaziz, Baseem Zlitni, Tarek Mahdi, Walid MIRACL: Multimedia Information systems and Advanced Computing Laboratory Sfax Tunisia

ISBN: (纸本)1424417511

In this paper, we propose a spatial temporal video-text detection technique which proceed in two principal steps: potential text region detection and a filtering process. In the first step we divide dynamically each pair of consecutive video frames into sub block in order to detect change. A significant difference between homologous blocks implies the appearance of an important object which may be a text region. The temporal redundancy is then used to filter these regions and forms an effective text region. The experimentation driven on a variety of video sequences shows the effectiveness of our approach by obtaining a 89,39% as precision rate and 90,19 as recall.

关键词： Indexing (of information)

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Improving peer Connectivity in wide-area overlays of virtual workstations 08

Improving peer Connectivity in wide-area overlays of virtual...

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17th International Symposium on High Performance Distributed computing 2008, HPDC'08

作者： Ganguly, Arijit Oscar Boykin, P. Wolinksky, David I. Figueiredo, Renato J. Advanced Computing and Information Systems Laboratory University of Florida Gainesville FL 32611 United States

ISBN: (纸本)9781595939975

Self-configuring virtual networks rely on structured P2P routing to provide seamless connectivity among nodes through overlay routing of virtual IP packets, support decentralized hole-punching to establish bi-directional communication links among nodes behind network address translators, and dynamic configuration of virtual IP addresses. Our experiences with deployments of virtual networks in support of wide-area overlays of virtual workstations (WOWs) reveal that connectivity constraints imposed by symmetric NATs and by Internet route outages often hinder P2P overlay structure maintenance and routability, subsequently limiting the ability of WOWs to deliver high-throughput computing through aggregation of resources in different domains. In this paper, we describe and evaluate two novel approaches which are generally applicable and fully decentralized, and show that they improve routability of structured P2P networks in such connectivity constrained environments: (1) a fault-tolerant routing algorithm based on simulated annealing from optimization theory, and (2) tunneling of connections between adjacent nodes (in the P2P identifier space) over common neighbors when direct communication is not possible. Simulation-based analyses show that when pairs of nodes only have 70% chance of being able to communicate directly, the described approaches improve all-to-all routability of the network horn 90% to 99%. We have implemented these techniques in the IP-over-P2P (IPOP) virtual network and have conducted experiments with a 80-node WOW Condor pool, demonstrating that, at 81% probability of establishing a pair-wise connection, annealing and tunneling combined allow all nodes to be connected to the pool, compared to only 160 nodes in the absence of these techniques. Copyright 2008 ACM.

关键词： Simulated annealing

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AViTExt: Automatic Video Text Extraction: A new Approach for video content indexing Application

AViTExt: Automatic Video Text Extraction: A new Approach for...

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3rd International Conference on information and Communication Technologies, vol.2

作者： Baseem Bouaziz Tarek Zlitni Walid Mahdi Multimedia Information systems and Advanced Computing Laboratory Sfax Tunisia

关键词： Component Video indexing and browsing Spatiotemporal approach Text extractin Non compressed video Multiple-frame

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AAAI 2008 workshop reports

AAAI 2008 workshop reports

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作者： Anand, Sarabjot Singh Bunescu, Razvan Carvcdho, Vitor Chomicki, Jan Conitzer, Vincent Cox, Michael T. Dignum, Virginia Dodds, Zachary Dredze, Mark Furcy, David Gabrilovich, Evgeniy Göker, Mehmet H. Guesgen, Hans Hirsh, Haym Jannach, Dietmar Junker, Ulrich Ketter, Wolfgang Kobsa, Alfred Koenig, Sven Lau, Tessa Lewis, Lundy Matson, Eric Metzler, Ted Mihalcea, Rada Mobasher, Bamshad Pineau, Joelle Poupart, Pascal Raja, Anita Ruml, Wheeler Sadeh, Norman Shani, Guy Shapiro, Daniel Smith, Trey Taylor, Matthew E. Wagstaff, Kiri Walsh, William Zhou, Rong Department of Computer Science University of Warwick United Kingdom School of Electrical Engineering and Computer Science Ohio University United States Microsoft Live Labs United States computer science and engineering University at Buffalo United States Computer science and economics Duke University United States Intelligent Computing group of BBN Technologies Utrecht University Netherlands Department of Computer science Harvey Mudd College United States University of Pennsylvania United States University of Wisconsin United States Yahoo Research PricewaterhouseCoopers Center for Advanced Research United States Department of Computer science School of Engineering and Advanced Technology Massey University New Zealand Departent of Computer science Rutgers University United States Department of Computer Science Dortmund University of Technology. Germany ILOG Rotterdam School of Management Erasmus University Netherlands Donald Bren School of Information and Computer Sciences University of California Irvine United States Depatrment of Computer science University of Southern California United States IBM Almaden Research Center United States Department of Computer Information Technology Southern New Hampshire University United States Computer and Information Technology Program College of Technology Purdue University United States Hughes Program for Religion and Science Dialogue Oklahoma City University United States Department of Computer Science and Engineering University of North Texas United States School of Computing DePaul University United States Department of Computer Science McGill University Canada School of Computer Science University of Waterloo Canada Department of Software and Information Systems University of North Carolina Charlotte United States University of New Hampshire United States Microsoft Research Institute for the Study of Learning and Expertise Applied Reactivity Inc. United States NASA Ames Research Center Carnegie Mellon University West

AAAI was pleased to present the AAAI-08 Workshop Program, held Sunday and Monday, July 13-14, in Chicago, Illinois, USA. The program included the following 15 workshops: Advancements in POMDP Solvers;AI Education Workshop Colloquium;Coordination, Organizations, Institutions, and Norms in Agent systems, Enhanced Messaging;Human Implications of Human-Robot Interaction;Intelligent Techniques for Web Personalization and Recommender systems;Metareasoning: Thinking about Thinking;Multidisciplinary Workshop on Advances in Preference Handling;Search in Artificial Intelligence and Robotics;Spatial and Temporal Reasoning;Trading Agent Design and Analysis;Transfer Learning for Complex Tasks;What Went Wrong and Why: Lessons from AI Research and Applications;and Wikipedia and Artificial Intelligence: An Evolving Synergy. Copyright © 2009, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Human robot interaction

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