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Performance of TCP/IP with MEDF scheduling

引用

5th International Workshop on Quality of Future Internet Services, QofIS 2004 and 1st Workshop on Quality of Service Routing, WQoSR 2004 and 4th International Workshop on Internet Charging and QoS Technology, ICQT 2004

作者： Martin, Ruediger Menth, Michael Vu, Phan-Gia Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland WürzburgD-97074 Germany

ISBN: (纸本)9783540232384

To achieve Quality of Service (QoS) in Next Generation Networks (NGNs), the Differentiated Services architecture implements appropriate Per Hop Behavior (PHB) for service differentiation. Common recommendations to enforce appropriate PHB include Weighted Round Robin (WRR), Deficit Round-Robin (DRR) and similar algorithms. They assign a fixed bandwidth share to Transport Service Classes (TSCs) of different priority. This is a viable approach if the ratio of high priority traffic TSChigh over low priority traffic TSClow is known in advance. If TSChigh holds more and TSClow less users than expected, the QoS for TSChigh can be worse than for TSClow. As shown in preceding work, the Modified Earliest Deadline First (MEDF) algorithm heals this problem on the packet level. Therefore, we investigate its impact in congested TCP/IP networks by simulations and show its attractiveness as a powerful service differentiation mechanism. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Quality of service

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Fire detection for early fire alarm based on optical flow video processing

Fire detection for early fire alarm based on optical flow vi...

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2012 9th International Conference on Electrical Engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON 2012

作者： Rinsurongkawong, Suchet Ekpanyapong, Mongkol Dailey, Matthew N. Mechatronics Asian Institute of Technology Pathumthani Thailand Microelectronics and Embedded Systems Asian Institute of Technology Pathumthani Thailand Computer Science and Information Management Asian Institute of Technology Pathumthani Thailand

ISBN: (纸本)9781467320245

We propose a method for early fire detection based on the Lucas-Kanade optical flow algorithm that is able to detect fire in real time in a video stream from a monocular camera. The method works both indoors and in open areas. It detects fire at the beginning of the burning process, enabling an earlier response than would be possible with a conventional fire detector. The method performs background subtraction to identify moving pixels in the scene then filters for colors consistent with fire. Growth rate analysis is applied to the contours identified in the previous step. We further propose the use of a Lucas-Kanade optical flow pyramid in the regions identified in the growth analysis step and analysis of the variance of the optical flow feature points' motion. In an experiment comparing the growth rate method alone with the combination of growth rate and optical flow analysis, we find that the algorithm improves the accuracy of fire detection for early fire alarming and reduce false alarm by solving the fire-like color. © 2012 IEEE.

关键词： Fires

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WCET-aware static locking of instruction caches 12

WCET-aware static locking of instruction caches

引用

10th International Symposium on Code Generation and Optimization, CGO 2012

作者： Plazar, Sascha Kleinsorge, Jan C. Marwedel, Peter Falk, Heiko Department of Computer Science 12 TU Dortmund University D-44221 Dortmund Germany Institute of Embedded Systems/Real-Time Systems Ulm University D-89081 Ulm Germany

ISBN: (纸本)9781605586359

In the past decades, embedded system designers moved from simple, predictable system designs towards complex systems equipped with caches. This step was necessary in order to bridge the increasingly growing gap between processor and memory system performance. Static analysis techniques had to be developed to allow the estimation of the cache behavior and an upper bound of the execution time of a program. This bound is called worst-case execution time (WCET). Its knowledge is crucial to verify whether hard real-time systems satisfy their timing constraints, and the WCET is a key parameter for the design of embedded systems. In this paper, we propose aWCET-aware optimization technique for static I-cache locking which improves a program's performance and predictability. To select the memory blocks to lock into the cache and avoid time consuming repetitive WCET analyses, we developed a new algorithm employing integer-linear programming (ILP). The ILP models the worst-case execution path (WCEP) of a program and takes the inuence of locked cache contents into account. By modeling the effect of locked memory blocks on the runtime of basic blocks, the overall WCET of a program can be minimized. We show that our optimization is able to reduce the estimated WCET (abbr. WCETest) of real-life benchmarks by up to 40.8%. At the same time, our proposed approach is able to outperform a regular cache by up to 23.8% in terms of WCETest. Copyright © 2012 ACM.

关键词： embedded systems

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A search-based approach for architectural design of feedback control concerns in Self-Adaptive systems

A search-based approach for architectural design of feedback...

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2013 IEEE 7th International Conference on Self-Adaptive and Self-Organizing systems, SASO 2013

作者： Andrade, Sandro S. De A. Macedo, Raimundo Jose GSORT Distributed Systems Group Federal Institute of Education Science and Technology of Bahia Salvador-Ba Brazil Department of Computer Science Federal University of Bahia Salvador-Ba Brazil

ISBN: (纸本)9780769551296

A number of approaches for endowing systems with self-Adaptive behavior have been proposed over the past years. Among such efforts, architecture-centric solutions with explicit representation of feedback loops have currently been advocated as a promising research landscape. Although noteworthy results have been achieved on some fronts, the lack of systematic representations of architectural knowledge and effective support for well-informed trade-off decisions still poses significant challenges when designing modern self-Adaptive systems. In this paper, we present a systematic and flexible representation of design dimensions related to feedback control concerns, a set of metrics which estimate quality attributes of resulting automated designs, and a search-based approach to find out a set of Pareto-optimal candidate architectures. The proposed approach has been fully implemented in a supporting tool and a case study with a self-Adaptive cloud computing environment has been undertaken. The results indicate that our approach effectively captures the most prominent degrees of freedom when designing self-Adaptive systems, helps to elicit effective subtle designs, and provides useful support for early analysis of trade-off decisions. © 2013 IEEE.

关键词： Economic and social effects

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Towards a Unified Flow Description Language for CPPSs: An Example with Material Flows 29

Towards a Unified Flow Description Language for CPPSs: An Ex...

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29th IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2024

作者： Gödeke, Jana Hörstrup, Maximilian Detzner, Peter Fraunhofer Institute for Material Flow and Logistics Department for Ai and Autonomous Systems Dortmund Germany Ruhr University Bochum Faculty of Computer Science Distributed and Networked Systems Group Bochum Germany

ISBN: (纸本)9798350361230

This paper presents a unified approach for repre-senting multiple domains alongside production in cyber-physical production systems (CPPSs) through domain-specific languages (DSLs). The approach is illustrated using material flows (MFs) as an example. The paper identifies requirements for DSLs in CPPSs and MFs, including concurrency, synchronization, constraints, and heterogeneity support. Subsequently, a plugin system is in-troduced for the existing Production Flow Description Language (PFDL), which allows users to incorporate additional domain-specific functionality in the form of plugins. To demonstrate this approach, we present the MF plugin, resulting in the combined PFDLMF. This showcases the reusability of such an approach and the easy integration of new CPPS domains. We envision the convergence of the PFDL with plugins towards a unified flow description language for CPPSs. A practical CPPS use-case demonstrates the expressiveness of the PFDLMF in modeling and executing complex MFs in an agent-based architecture. © 2024 IEEE.

关键词： Reusability

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Multiagent System Technologies 1

引用

丛书名： Lecture Notes in computer science

1000年

作者： Lars Braubach Wiebe Hoek Paolo Petta Alexander Pokahr

ISBN: (数字)9783642041433

ISBN: (纸本)9783642041426

This book constitutes the refereed proceedings of the 7th German Conference on Multiagent systems Technologies, MATES 2009, held in Hamburg, Germany in September 2009 - colocated with the 10th International Workshop on Computational Logic in Multi-Agent systems (CLIMA X) and the 5th International Workshop on Modelling of Objects, Components, and Agents (MOCA 2009). The 14 revised full papers, 10 short papers, and 5 exhibition papers presented together with one invited talk were carefully reviewed and selected from 44 submissions. The papers present and discuss the latest advances of research and development in the area of autonomous agents and multiagent systems ranging from theoretical and methodological issues to applications in various fields.

关键词： Artificial Intelligence Software Engineering Computation by Abstract Devices Programming Techniques Simulation and Modeling computer systems Organization and Communication Networks

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Optimal scheduling of iterative data-flow programs onto multiprocessors with non-negligible interprocessor communication 7th

Optimal scheduling of iterative data-flow programs onto mult...

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7th International Conference on High-Performance Computing and Networking, HPCN Europe 1999

作者： Antony Louis Piriyakumar, D. Levi, Paul Siva Ram Murthy, C. Institute of Parallel and Distributed High-Performance Systems University of Stuttgart Stuttgart70565 Germany Department of Computer Science and Engineering Indian Institute of Technology Chennai600 036 India

ISBN: (纸本)3540658211

The problem of optimal compile-time multiprocessor scheduling of iterative data-flow programs with feedback (delay elements) is addressed in this paper, unlike the earlier studies assumed the availability of a large number of processors and complete interconnection among them along with the interprocessor communication (IPC) to be non-negligible to be more realistic. We first explain the effects of including IPC in non-overlapped, overlapped, fully-static, and cyclo-static multiprocessor schedules with LMS filter as a realistic example. The effect of IPC in the rate-optimal schedules with the transformation techniques viz. unfolding and retiming in scheduling data-flow programs with optimal unfolding is discussed with an example. We then propose an algorithm, based on the well-known A* algorithm, for optimal scheduling of data-flow programs onto multiprocessors, which uses only minimum number of processors. To alleviate the impediments of large requirements of memory space and CPU time for the optimal scheduling algorithm, we present an effective technique, branch join path isomorphism (BJP) which relies on our previously defined processor isomorphism, task isomorphism, and node isomorphism apart from the lower bound theory and upper bound on the completion time. The schedules produced by our algorithm are superior to those obtained by the earlier algorithms despite considering IPC as non-negligible and also not completely connected multiprocessor systems. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Scheduling

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Generating realistic workloads for network intrusion detection systems

Generating realistic workloads for network intrusion detecti...

引用

Proceedings of the Fourth International Workshop on Software and Performance, WOSP'04

作者： Antonatos, Spyros Anagnostakis, Kostas G. Markatos, Eyangelos P. Institute of Computer Science Found. for Research and Technology Hellas Greece Distributed Systems Lab. CIS Department Univ. of Pennsylvania United States

ISBN: (纸本)1581136730

While the use of network intrusion detection systems (nIDS) is becoming pervasive, evaluating nIDS performance has been found to be challenging. The goal of this study is to determine how to generate realistic workloads for nIDS performance evaluation. We develop a workload model that appears to provide reasonably accurate estimates compared to real workloads. The model attempts to emulate a traffic mix of different applications, reflecting characteristics of each application and the way these interact with the system. We have implemented this model as part of a traffic generator that can be extended and tuned to reflect the needs of different scenarios. We also present an approach to measuring the capacity of a nIDS that does not require the setup of a full network testbed. security, intrusion detection, workload characterization and generation.

关键词： computer networks

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Biologically sound neural networks for embedded systems using OpenCL

Biologically sound neural networks for embedded systems usin...

引用

1st International Conference on Networked systems, NETYS 2013

作者： Fehérvári, István Sobe, Anita Elmenreich, Wilfried Mobile Systems Group Institute for Networked and Embedded Systems Alpen-Adria-Universität Klagenfurt Austria Computer Science Department University of Neuchâtel Switzerland Complex Systems Engineering University of Passau Germany

ISBN: (纸本)9783642401473

In this paper, we present an OpenCL implementation of a biologically sound spiking neural network with two goals in mind: First, applied neural dynamics should be accurate enough for bio-inspired training methods, thus resulting network data is reproducible in "in vitro" experiments. The second is that the implementation produces code that runs adequately on up-to-date embedded graphical chips for fast on-board classification applications, e.g., video image processing. We describe the necessary steps required to implement an efficient algorithm using the OpenCL framework and present evaluation results of the execution time compared to traditional serial CPU code. We show that an optimized GPU kernel code can perform sufficiently fast to be used for future embedded neural processing. © 2013 Springer-Verlag.

关键词： Neural networks

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Verifying the distributed Real-Time Network Protocol RTnet Using Uppaal

Verifying the Distributed Real-Time Network Protocol RTnet U...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication systems (MASCOTS)

作者： F. Hanssen A. Mader P.G. Jansen Distributed and Embedded Systems Group Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Netherlands

RTnet is a distributed real-time network protocol for fully-connected local area networks with a broadcast capability. It supports streaming real-time and non-realtime traffic and on-the-fly addition and removal of network nodes. This paper presents a formal analysis of RTnet using the model checker Uppaal. Besides normal protocol behaviour, the analysis focuses on the fault-handling properties of RTnet, in particular recovery after packet loss. Both qualitative and quantitative properties are presented, together with the verification results and conclusions about the robustness of RTnet.

关键词： Protocols Streaming media Real time systems Local area networks Broadcasting Quality of service Timing Automata Automatic control Communication system control

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