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Influence of traffic management solutions on Quality of Experience for prevailing overlay applications

Influence of traffic management solutions on Quality of Expe...

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Conference on Next Generation Internet Networks, NGI

作者： Rafał Stankiewicz Piotr Chołda Jerzy Domżał Robert Wójcik Tobias Hoßfeld Thomas Zinner Simon Oechsner Frank Lehrieder Department of Telecommunications AGH University of Science and Technology Krakow Poland University of Würzburg Institute of Computer Science Chair of Distributed Systems Würzburg Germany

Different sorts of peer-to-peer (P2P) applications emerge every day and they are becoming more and more popular. The performance of such applications may be measured by means of Quality of Experience (QoE) metrics. In this paper, the factors that influence these metrics are surveyed. Moreover, the impact of economic traffic management solutions (e.g., proposed by IETF) on perceived QoE for the dominant overlay applications is assessed. The possible regulatory issues regarding QoE for P2P applications are also mentioned.

关键词： Streaming media Quality of service Availability Software Measurement Bandwidth Switches

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System-level application-aware dynamic power management in adaptive pipelined MPSoCs for multimedia 11

System-level application-aware dynamic power management in a...

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IEEE International Conference on computer-Aided Design

作者： Haris Javaid Muhammad Shafique Jörg Henkel Sri Parameswaran School of Computer Science and Engineering University of New South Wales Sydney Australia Chair for Embedded Systems Karlsruhe Institute of Technology Karlsruhe Germany

ISBN: (纸本)9781457713989

System-level dynamic power management (DPM) schemes in Multiprocessor System on Chips (MPSoCs) exploit the idleness of processors to reduce the energy consumption by putting idle processors to low-power states. In the presence of multiple low-power states, the challenge is to predict the duration of the idle period with high accuracy so that the most beneficial power state can be selected for the idle processor. In this work, we propose a novel dynamic power management scheme for adaptive pipelined MPSoCs, suitable for multimedia applications. We leverage application knowledge in the form of future workload prediction to forecast the duration of idle periods. The predicted duration is then used to select an appropriate power state for the idle processor. We proposed five heuristics as part of the DPM and compared their effectiveness using an MPSoC implementation of the H.264 video encoder supporting HD720p at 30 fps. The results show that one of the application prediction based heuristic (MAMAPBH) predicted the most beneficial power states for idle processors with less than 3% error when compared to an optimal solution. In terms of energy savings, MAMAPBH was always within 1% of the energy savings of the optimal solution. When compared with a naive approach (where only one of the possible power states is used for all the idle processors), MAMAPBH achieved up to 40% more energy savings with only 0.5% degradation in throughput. These results signify the importance of leveraging application knowledge at system-level for dynamic power management schemes.

关键词： Multimedia communication History Prediction algorithms Energy consumption Motion estimation Streaming media Clocks

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Low-power adaptive pipelined MPSoCs for multimedia: An H.264 video encoder case study 11

Low-power adaptive pipelined MPSoCs for multimedia: An H.264...

引用

Design Automation Conference

作者： Haris Javaid Muhammad Shafique Sri Parameswaran Jörg Henkel School of Computer Science and Engineering University of New South Wales Sydney Australia Chair for Embedded Systems Karlsruhe Institute of Technology Karlsruhe Germany

ISBN: (纸本)9781450306362

Pipelined MPSoCs provide a high throughput implementation platform for multimedia applications, with reduced design time and improved flexibility. Typically a pipelined MPSoC is balanced at design-time using worst-case parameters. Where there is a widely varying workload, such designs consume exorbitant amount of power. In this paper, we propose a novel adaptive pipelined MPSoC architecture that adapts itself to varying workloads. Our architecture consists of Main Processors and Auxiliary Processors with a distributed run-time balancing approach, where each Main Processor, independent of other Main Processors, decides for itself the number of required Auxiliary Processors at run-time depending on its varying workload. The proposed run-time balancing approach is based on off-line statistical information along with workload prediction and run-time monitoring of current and previous workloads' execution times. We exploited the adaptability of our architecture through a case study on an H.264 video encoder supporting HD720p at 30 fps, where clock- and power-gating were used to deactivate idle Auxiliary Processors during low workload periods. The results show that an adaptive pipelined MPSoC provides energy savings of up to 34% and 40% for clock- and power-gating based deactivation of Auxiliary Processors respectively with a minimum throughput of 29 fps when compared to a design-time balanced pipelined MPSoC.

关键词： Program processors Clocks Throughput Multimedia communication Motion estimation Streaming media Energy consumption

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Towards an ESL design framework for adaptive and fault-tolerant MPSoCs: MADNESS or not?

Towards an ESL design framework for adaptive and fault-toler...

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2011 9th IEEE Symposium on Embedded Systems for Real-Time Multimedia, ESTIMedia 2011

作者： Cannella, Emanuele Di Gregorio, Lorenzo Fiorin, Leandro Lindwer, Menno Melonr, Paolo Neugebauer, Olaf Pimentel, Andy Leiden Institute of Advanced Computer Science Leiden University Netherlands Lantiq Deutschland GmbH Neubiberg Germany ALaRI Faculty of Informatics University of Lugano Switzerland Silicon Hive BV High Tech Campus 83 5656 AG Eindhoven Netherlands DIEE Department of Electrical and Electronic Engineering University of Cagliari Cagliari Italy Informatik Centrum Dortmund Joseph-von-Fraunhofer-Str. 20 Dortmund Germany Computer Systems Architecture Group Informatics Institute University of Amsterdam Netherlands

ISBN: (纸本)9781457721236

The MADNESS project aims at the definition of innovative system-level design methodologies for embedded MP-SoCs, extending the classic concept of design space exploration in multi-application domains to cope with high heterogeneity, technology scaling and system reliability. The main goal of the project is to provide a framework able to guide designers and researchers to the optimal composition of embedded MPSoC architectures, according to the requirements and the features of a given target application field. The proposed approach will tackle the new challenges, related to both architecture and design methodologies, arising with the technology scaling, the system reliability and the ever-growing computational needs of modern applications. The methodologies proposed with this project act at different levels of the design flow, enhancing the state-of-the art with novel features in system-level synthesis, architectural evaluation and prototyping. Support for fault resilience and efficient adaptive runtime management is introduced at hardware and middleware level, and considered by the system-level synthesis as one of the optimization factors to be taken into account. This paper presents the first stable results obtained in the MADNESS project, already demonstrating the effectiveness of the proposed methods. © 2011 IEEE.

关键词： Middleware

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Information network technology and collaborative learning

Information network technology and collaborative learning

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International Conference on computer science and Service System (CSSS)

作者： Jiajun Liu Fengyun Li Shouyi Liu Hebei Institute of Architecture and Civil Engineering Zhangjiakou Hebei China Department of Computer Science Hebei Institute of Architecture and Civil Engineering Zhangjiakou Hebei China Hebei North University Zhangjiakou Hebei China

The basic concepts of network collaborative learning, theoretical grounds and social significance are mainly discussed in this article. With online collaborative learning practice, we summarized the advantages and disadvantages of the collaborative learning model. It is explicitly affirmed that the use of advanced information technology reform for development of collaborative learning network information age has become an important trend in educational development. With the development of economic, the network collaborative learning will become a major learning approach.

关键词： Collaborative work Education Collaboration Information technology computers Multimedia communication Presses

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Context Model for Representation of Business Process Management Artifacts

Context Model for Representation of Business Process Managem...

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2011 International Conference on Economics and Business Information（ICEBI 2011）

作者： Matthias Wieland Daniela Nicklas Frank Leymann Institute of Architecture of Application Systems Universitt StuttgartGermany Department for Computer Science Carl von Ossietzky Universitt OldenburgGermany

Context-aware systems adapt their functionality and behavior to the user and his or her *** do so,they need context information about the user's environment,e.g.,about different kinds of real world *** model and manage context information,many systems have been *** important part of context that is often neglected is the state and context of the applications that users are currently *** contribution of this paper is to present an extension for a standard context model that allows the representation of the context of workflow based *** that,business process management envi-ronments are enabled to annotate their context and provide it for other context-aware applications and users.

关键词： business process management workflows context-awareness human tasks services

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A framework for early stage quality-fault tolerance analysis of embedded control systems

A framework for early stage quality-fault tolerance analysis...

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International Conference on Dependable Systems and Networks (DSN)

作者： S. G. Vadlamudi P. P. Chakrabarti Dipankar Das Purnendu Sinha Department of Computer Science and Engineering Indian Institute of Technology Kharagpur Kharagpur India Electrical and Software Architecture Group General Motors India Science Laboratory Bangalore India

This work presents a static-analysis based method for analyzing the robustness of a given embedded control system design, in the presence of quality-faults in sensors, software components, and inter-connections. The method characterizes the individual components of the system by storing the relations between the precision of inputs and the precision of outputs in what we call, lookup tables (LUTs). A network of LUTs thus formed which represent the given control system is converted into a satisfiability modulo theory (SMT) instance, such that a satisfying assignment corresponds to a potential counterexample (the set of quality-faults which violate the given fault-tolerance requirements) or hot-spot in the design. Hot-spots obtained in this manner are counter-verified through simulation to filter the false-positives. Experimental results on the fault-tolerant fuel controller from Simulink automotive library demonstrate the efficacy of the proposed approach.

关键词： Sensors Degradation Fault tolerant systems Noise Fault tolerance Trajectory Table lookup

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New image de-noising method using Curvelet transform

New image de-noising method using Curvelet transform

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International Conference on Consumer Electronics, Communications and Networks

作者： Jing Ji Shan Gai School of Mechanical and Electrical Engineering Anhui University of Architecture Anhui China School of computer science and technology Harbin Institute of Technology Harbin China

ISBN: (纸本)9781612844589

The image de-noising method via USFFT Curvelet transform is proposed in this paper. The method can preserve the detail information of high frequency of noisy image, and to avoid the phenomenon of edge slant during the image reconstruction. The USFFT Curvelet transform is used to the noisy image, the global threshold value is estimated in the Curvelet domain. The window technique is used to compute the shrinkage factor corresponding to pixel value. The de-noised image signal is obtained by using inverse USFFT Curvelet transform. The experimental results show that the algorithm obtains a higher PSNR value for gray and color images. It acquires a good de-noisy effect and visual effect, and preserves image edge well.

关键词： Noise reduction Wavelet transforms Image denoising Image edge detection PSNR

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Nonlinear adaptive model predictive control for ship path-following using parametric neighbouring extremal approach 11

Nonlinear adaptive model predictive control for ship path-fo...

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11th International Conference on Fast Sea Transportation, FAST 2011

作者： Gao, Lingfeng Ghaemi, Reza Sun, Jing Dept. of Electrical Engineering and Computer Science University of Michigan Ann ArborMI United States Dept. of Mechanical Engineering Massachusetts Institute of Technology CambridgeMA United States Dept. of Naval Architecture and Marine Engineering University of Michigan Ann ArborMI United States

ISBN: (纸本)9780985066000

This paper considers the ship path following problem with state and input constraints. The control problem associated with path following is formulated as a Model Predictive Control (MPC) with adjustable parameters. The Parametric Neighbouring Extremal (PNE) approach is applied to obtain a closed form solution. The algorithm is presented and computational details associated with numerical implementation are addressed. The effectiveness of the proposed control scheme is demonstrated through simulations using a detailed nonlinear ship model for several different scenarios. © 2011 American Society of Naval Engineers.

关键词： Model predictive control

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Spam filter based on incremental Bayes arithmetic

Spam filter based on incremental Bayes arithmetic

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2nd Annual Conference on Electrical and Control Engineering, ICECE 2011

作者： Yan, Han-Bing Liu, Ya-Shu National Computer Network Emergency Response Technical Team/Coordination Center of China National Institute of Network and Information Security Beijng China Department of Computer Science Beijing University of Civil Engineering and Architecture Beijing China

ISBN: (纸本)9781424481637

With the development of Internet, Email has become an important interaction manner. At the same time, spam becomes a boring thing in our life, and people pay more and more attention to spam filter. In this paper, we propose a method that uses N-Gram to calculate characters and uses 2 statistical method to extract characters, and then uses incremental Native Bayes arithmetic to hold up spam. In order to arise accuracy we use the filter method over and over again. The experiments show that our method is very effective, which greatly raises the accurarcy while keeping a minor error ratio. © 2011 IEEE.

关键词： Bandpass filters

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