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检索条件"机构=Multimedia InfoRmation Systems and Advanced Computing Laboratory"

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Decentralized Dynamic Host Configuration in Wide-Area Overlays of Virtual Workstations

Decentralized Dynamic Host Configuration in Wide-Area Overla...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Arijit Ganguly David Wolinsky P. Oscar Boykin Renato Figueiredo Advanced Computing and Information Systems Laboratory University of Florida Gainesville FL USA

Wide-area overlays of virtual workstations (WOWs) have been shown to provide excellent infrastructure for deploying high throughput computing environments on commodity desktop machines by (1) offering scalability to a large number of nodes, (2) facilitating addition of new nodes even if they are behind NATs/firewalls and (3) supporting unmodified applications and middleware. However, deployment of WOWs from scratch still requires setting up a bootstrapping network and managing centralized DHCP servers for IP address management. In this paper we describe novel techniques that allow multiple users to create independent, isolated virtual IP namespaces for their WOWs without requiring a dedicated bootstrapping infrastructure, and to provision dynamic host configuration (e.g. IP addresses) to unmodified DHCP clients without requiring the setup and management of a central DHCP server. We give qualitative and quantitative arguments to establish the feasibility of our approach.

关键词： Workstations Peer to peer computing Network address translation Network servers Virtual manufacturing Middleware Virtual machining Application software Environmental management Oceans

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Experimental Study of Virtual Machine Migration in Support of Reservation of Cluster Resources

Experimental Study of Virtual Machine Migration in Support o...

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International Workshop on Virtualization Technology in Distributed computing (VTDC)

作者： Ming Zhao Renato J. Figueiredo Advanced Computing and Information Systems Laboratory (ACIS) Electrical and Computer Engineering University of Florida USA

Virtual Machines are becoming increasingly valuable to resource consolidation and management, providing efficient and secure resource containers, along with desired application execution environments. This paper focuses on the VM-based resource reservation problem, that is, the reservations of CPU, memory and network resources for individual VM instances, as well as for VM clusters. In particular, it considers the scenario where one or several physical servers need to be vacated to start a cluster of VMs for dedicated execution of parallel jobs. VMs provide a primitive for transparently vacating workloads through migration; however, the process of migrating several VMs can be time-consuming and needs to be estimated. To achieve this goal, this paper seeks to provide a model that can characterize the VM migration process and predict its performance, based on a comprehensive experimental analysis. The results show that, given a certain VM's migration time, it is feasible to predict the time for a VM with other configurations, as well as the time for migrating a number of VMs. The paper also shows that migration of VMs in parallel results in shorter aggregate migration times, but with higher per-VM migration latencies. Experimental results also quantify the benefits of buffering the state of migrated VMs in main memory without committing to hard disks.

关键词： Virtual machining Voice mail Virtual manufacturing Environmental management Resource management Containers Network servers Predictive models Performance analysis Aggregates

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A metadata-based architectural model for dynamically resilient systems 07

A metadata-based architectural model for dynamically resilie...

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2007 ACM Symposium on Applied computing

作者： Di Marzo Serugendo, Giovanna Fitzgerald, John Romanovsky, Alexander Guelfi, Nicolas School of Computer Science and Information Systems Birkbeck College London United Kingdom School of Computing Science University of Newcastle NE1 7RU Newcastle upon Tyne United Kingdom Laboratory for Advanced Software Systems University of Luxembourg Luxembourg Luxembourg

ISBN: (纸本)1595934804

Designing open and distributed systems that can dynamically adapt in a predictable way to unexpected events is a challenging issue still not solved. Achieving this objective is a very complex task since it implies reasoning at run-time, explicitly and in a combined way, on a system's functional and non-functional characteristics. This paper proposes a service-oriented architectural model allowing the dynamic enforcement of formally expressed metadata-based resilience policies. It also describes preliminary dynamic resilience experiments acting as proof of concept. Copyright 2007 ACM.

关键词： Metadata

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Adaptive Predictor Integration for System Performance Prediction

Adaptive Predictor Integration for System Performance Predic...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Jian Zhang Renato J. Figueiredo Advanced Computing and Information Systems (ACIS) Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

The integration of multiple predictors promises higher prediction accuracy than the accuracy that can be obtained with a single predictor. The challenge is how to select the best predictor at any given moment. Traditionally, multiple predictors are run in parallel and the one that generates the best result is selected for prediction. In this paper, we propose a novel approach for predictor integration based on the learning of historical predictions. It uses classification algorithms such as k-Nearest Neighbor (k-NN) based supervised learning to forecast the best predictor for the workload under study. Then only the forecasted best predictor is run for prediction. Our experimental results show that it achieved 20.18% higher best predictor forecasting accuracy than the cumulative MSB based predictor selection approach used in the popular network weather service system. In addition, it outperformed the observed most accurate single predictor in the pool for 44.23% of the performance traces.

关键词： System performance Predictive models Virtual machining Weather forecasting Bandwidth Availability Accuracy Classification algorithms Grid computing Principal component analysis

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Automated multimedia systems Training Using Association Rule Mining

Automated Multimedia Systems Training Using Association Rule...

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IEEE International Conference on information Reuse and Integration (IRI)

作者： Na Zhao Shu-Ching Chen Stuart H. Rubin Distributed Multimedia Information System Laboratory School of Computing and Information Sciences Florida International University Miami FL USA SPAWAR Systems Center San Diego CA USA

User feedback is widely deployed in recent multimedia research to refine retrieval performance. However, most of the existing online learning algorithms handle interactions of a single user, which may pose restrained performance due to the limited size of positive feedback. An alternative solution is to learn general user perceptions via collecting feedback from different users. The training process is initiated only when the number of feedbacks reaches a certain threshold. This could improve the performance but it becomes a manual process to decide the threshold and initiate the training process. To address this challenge, ire propose an advanced training method by adopting the association rule mining technique, which can effectively evaluate accumulated feedback and automatically invoke the training process. Training is performed per video rather than for all videos in the database, making the process more efficient and robust. In addition, it can further improve semantic modeling in the video database and continuously improve retrieval performance in the long run. As an example, the proposed method is applied to a mobile-based soccer video retrieval system and the experimental results are analyzed.

关键词： multimedia systems Association rules Data mining information retrieval Radio frequency Feedback multimedia databases Content based retrieval Support vector machines multimedia computing

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Simultaneous estimation of optical flow and object state: A modified approach to optical flow calculation

Simultaneous estimation of optical flow and object state: A ...

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IEEE International Conference on Networking, Sensing and Control

作者： Pubudu N Pathirana Allan E.K. Lim John Carminati Malin Premaratne School of Engineering and Information Technology Deakin University Geelong Australia Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Monash University Clayton VIC Australia

Differential optical flow methods are widely used within the computer vision community. They are classified as being either local, as in the Lucas-Kanade method, or global, as in the Horn-Schunck technique. As the physical dynamics of an object is inherently coupled into the behavior of its image in the video stream, in this paper, we use such dynamic parameter information in calculating optical flow when tracking a moving object using a video stream. Indeed, we use a modified error function in the minimization that contains physical parameter information. Further, the refined estimates of optical flow is used for better estimation of the physical parameters of the object in the simultaneous estimation of optical flow and object state(SEOS).

关键词： Image motion analysis State estimation Optical sensors Optical filters Optical noise Parameter estimation Nonlinear optics Streaming media Optical fiber networks Computer vision

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ALiFE: Automatic lip feature extraction: A new approach for speech recognition application 2

ALiFE: Automatic lip feature extraction: A new approach for ...

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2nd International Conference on information and Communication Technologies: From Theory to Applications, ICTTA 2006

作者： Werda, Salah Mahdi, Walid Tmar, Mohamed Hamadou, Abdelmajid Ben MIRACL Multimedia Information Systems and Advanced Computing Laboratory Higher Institute of Computer Science and Multimedia Sfax Tunisia

ISBN: (纸本)0780395212

Actually several domains 'general public' are concerned by the utility of visual speech information such as e-learning, Tele-assistance, Human-Machine interaction, etc. The visual information helpfulness is more imperative among people with special needs. We can imagine for example, a dependant people ordered his machine with an easy lip movement or by a simple syllable pronunciation. More than, hard of hearing people normally compensate for their hearing problems by lip-reading as well as listening to the person they are talking to. Therefore, it's very important to create an automatic lip-reading system that resolve partially people hearing problem. We presents in this paper a new hybrid approach named ALiFE to automatically localize lipfeature points in the speaker's face and to carry out a spatial-temporal tracking of these points. ALiFE prototype is evaluated with a multiple speakers under natural conditions. In order to approve our lipfeature extraction approach, we have created a specific audio-visual corpus. The final results show the diferent configuration of the mouth through visemes. Later on these visemes will be associated to relatively precise physical measures. © 2006 IEEE.

关键词： Audition

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A new video images text localization approach based on a fast hough transform

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3rd International Conference on Image Analysis and Recognition, ICIAR 2006

作者： Bouaziz, Bassem Mahdi, Walid Hamadou, Abdelmajid Ben MIRACL Multimedia InfoRmation System and Advanced Computing Laboratory Higher Institute of Computer Science and Multimedia BP 1030 Sfax 69042 Tunisia

ISBN: (纸本)3540448918

The amount of digital video data is increasing over the world. It highlights the need for efficient algorithms that can retrieve this data by content. The full use of this media is currently limited by the opaque nature of the video which prevents content-based access. To facilitate video indexing and browsing, it is essential to allow non-linear access, especially for long programs. This can be achieved by identifying semantic description captured automatically from video story structure. Among these descriptions, text within video frames is considered as rich features that enable a good way for browsing video. In this paper we propose a fast Hough transformation based approach for automatic video frames text localization. Experimental results, that we drove on a large sample of video images issued from portions of news broadcasts, sports program, advertisements and movies, shows that our method is very efficient, capable to locate text regions with different character sizes, directions and styles even in case of complex image background. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Image analysis

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A nanoscale memory interface scheme based on hierarchical memory mapping

A nanoscale memory interface scheme based on hierarchical me...

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2006 6th IEEE Conference on Nanotechnology, IEEE-NANO 2006

作者： Venkatasubramanian, Girish Figueiredo, Renato J. Advanced Computing and Information Systems Laboratory University of Florida Gainesville FL 32611 United States

ISBN: (纸本)1424400783

This paper presents a nanoscale to microscale interface for crossbar based memory architectures based on multi-stage memory mappers. By designing each stage carefully and by adding sufficient number of stages the total interface module size can be reduced to a size that is 3% to 5% the size of a one-stage mapper implemented in microscale. Thus most of the area advantage in using nanoscale memories can be retained. This architecture is also technology-independent and fault-tolerant. We have developed a model which relates the various design parameters to the size of the interface module and examined these design issues in depth. © 2006 IEEE.

关键词： Nanowires

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IP over P2P: Enabling self-configuring virtual IP networks for grid computing 20

IP over P2P: Enabling self-configuring virtual IP networks f...

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20th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2006

作者： Ganguly, Arijit Agrawal, Abhishek Oscar Boykin, P. Figueiredo, Renato Advanced Computing and Information Systems Laboratory University of Florida Gainesville FL - 32601 United States

ISBN: (纸本)1424400546

Peer-to-peer (P2P) networks have mostly focused on task oriented networking, where networks are constructed for single applications, I.e. file-sharing, DNS caching, etc. In this work, we Introduce IPOP, a system for creating virtual IP networks on top of a P2P overlay. IPOP enables seamless access to Grid resources spanning multiple domains by aggregating them Into a virtual IP network that Is completely Isolated from the physical network. The virtual IP network provided by IPOP supports deployment of existing IP-based protocols over a robust, self-configuring P2P overlay. We present Implementation details as well as experimental measurement results taken from LAN, WAN, and Planet-Lab tests. © 2006 IEEE.

关键词： Distributed computer systems

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