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Automated high-accuracy hybrid measurement for distributed embedded systems

Automated high-accuracy hybrid measurement for distributed e...

引用

Workshop on Intelligent Solutions in Embedded systems

作者： M. Thoss Distributed Operation Systems (DOPSY) Group Department of Computer Science University of Applied Sciences Fachhochschule Wiesbaden Wiesbaden Germany

This paper presents the design and realisation of a hybrid, high-accuracy, automated measurement framework. A hybrid measurement system is introduced that has been successfully used to carry out high-accuracy measurements in distributed automation environments. The application of the hybrid measurement system is not limited to such environments, though. It is characterised by monitoring distributed events with low interference and by the usage of global timestamps based on the high-resolution clock of a logic analyser. Furthermore, it exhibits an extensively automated experiment control and data analysis framework. Measurement results gained with the approach are presented as well.

关键词： Embedded system Clocks Software measurement Monitoring Gain measurement Delay Protocols Time measurement Hardware Instruments

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Discovering semantic relations between Web services using their pre and post-conditions

Discovering semantic relations between Web services using th...

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IEEE International Conference on Services Computing (SCC)

作者： Lin Lin I.B. Arpinar LSDIS (Large Scale Distributed Information Systems) Laboratory Department of Computer Science University of Georgia Athens GA USA

Discovering and assembling individual Web services into more complex yet new and more useful Web processes receive significant attention from the academia recently. In this paper, we explore using pre and post-conditions of Web services to enable their automatic composition. Also, we present a novel technique for discovering semantic relations between pre and post-conditions of different services using their ontological descriptions. This enables determining services with complimentary functions and generating a semantic Web of services. Our technique takes semantic similarity of pre and post-conditions into account and builds on our earlier work on discovering semantic relationships between interfaces (input and output) of Web services.

关键词： Web services Tin Semantic Web Resource description framework Ontologies Large-scale systems distributed information systems computer science Assembly systems Information resources

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An energy-aware medium-access-control protocol with frequent sleeps for wireless sensor networks

An energy-aware medium-access-control protocol with frequent...

引用

IEEE Symposium on computers and communications (ISCC)

作者： C.K. Nguyen A. Kumar Mobile Information Networks & Distributed Systems (MINDS) Laboratory Department of Computer Engineering & Computer Science (CECS) University of Louisville Louisville KY USA

The paper proposes an energy-aware contention-based protocol for the medium access control (MAC) sub-layer for wireless sensor networks. The innovative approach with frequent sleeps proactively and aggressively reduces the wasted energy while increasing the throughput and decreasing the latency. The proposed MAC protocol solves the energy inefficiency caused by idle listening, control-packet overhead, and overhearing. Simulation experiments have been performed to demonstrate the effectiveness of the proposed approach, especially compared to the S-MAC and T-MAC protocols.

关键词： Wireless application protocol Wireless sensor networks Media Access Protocol Throughput Access protocols Delay Energy consumption communication system control communication channels

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Comparison of Crawling Strategies for an Optimized Mobile P2P Architecture

Comparison of Crawling Strategies for an Optimized Mobile P2...

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The 19th International Teletraffic Congress-ITC19

作者： Tobias Hoβfeld Andreas Mder Kurt Tutschku Phuoc Tran-Gia Frank-Uwe Andersen Hermann de Meer Ivan Dedinski Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland 97074 Würzburg Germany Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland 97074 Würzburg Germany Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland 97074 Würzburg Germany Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland 97074 Würzburg Germany Siemens Communications Siemensdamm 62 13623 Berlin Germany Chair of Computer Networks and Computer Communications University of Passau Innstr. 33 94032 Passau Germany Chair of Computer Networks and Computer Communications University of Passau Innstr. 33 94032 Passau Germany

Mobile networks differ from their wireline counterparts mainly by the high costs for air transmissions and by the mobility of the users. A new entity, denoted as the crawling peer, is suggested in order to optimize the resource mediation mechanism for a mobile P2P file sharing application. The crawling peer locates content on behalf of mobile peers. It is placed in the wireline part of the mobile network and thus, does not suffer from the above mentioned restrictions. The crawling peer is part of a comprehensive mobile P2P file sharing architecture [1] which is based on the popular eDonkey file sharing application. The performance of three querying strategies of the crawling peer is investigated with respect to banning at the index servers and the response time of requests, i.e. the time to find a file. The results show that the selection of an appropriate request strategy for the crawling peer maximizes the probabihty of locating a file while the probability to be banned by an eDonkey index server is minimized.

关键词： P2P, mobile network architecture, resource mediation

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A time optimization algorithm for scheduling bag-of-task applications in auction-based proportional share systems

A time optimization algorithm for scheduling bag-of-task app...

引用

International Symposium on computer Architecture and High Performance Computing (SBAC-PAD)

作者： A. Sulistio R. Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Carlton VIC Australia

Grid and peer-to-peer (P2P) network technologies enable aggregation of distributed resources for solving large-scale and computationally-intensive applications. These technologies are well-suited for bag-of-tasks (BoT) applications, because each application consists of many parallel and independent tasks. With multiple users competing for the same resources, the key challenge is to finish a user application within a specified deadline. In this paper, we propose a time optimization algorithm that schedules a user application on auction-based resource allocation systems. These allocation systems, which are based on proportional share, allow users to bid higher in order to gain more resource shares. Therefore, this algorithm adjusts a user bid periodically on these systems in order to finish the application on time.

关键词： Scheduling algorithm Application software Resource management Peer to peer computing Processor scheduling Grid computing computer applications Large-scale systems computer networks distributed computing

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Cost-based scheduling of scientific workflow applications on utility grids

Cost-based scheduling of scientific workflow applications on...

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IEEE International Conference on e-science and Grid Computing

作者： Jia Yu R. Buyya Chen Khong Tham Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia Department of Electrical and Computer Engineering National University of Singapore Singapore

Over the last few years, grid technologies have progressed towards a service-oriented paradigm that enables a new way of service provisioning based on utility computing models. Users consume these services based on their QoS (quality of service) requirements. In such "pay-per-use" grids, workflow execution cost must be considered during scheduling based on users' QoS constraints. In this paper, we propose a cost-based workflow scheduling algorithm that minimizes execution cost while meeting the deadline for delivering results. It can also adapt to the delays of service executions by rescheduling unexecuted tasks. We also attempt to optimally solve the task scheduling problem in branches with several sequential tasks by modeling the branch as a Markov decision process and using the value iteration method

关键词： Optimal scheduling Processor scheduling Scheduling algorithm Workflow management software Grid computing Quality of service Costs computer networks Time factors Delay

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Role of low O2 pressure and growth temperature on electrical transport of PLD grown ZnO thin films on Si substrates

Role of low O2 pressure and growth temperature on electrical...

引用

2005 International Semiconductor Device Research Symposium

作者： Pandis, Ch. Brills, N. Tsamakis, D. Ali, H. Krishnamoorthy, S. Iliadis, A.A. School of Electrical Engineering and Computer Science National Technical University of Athens Iroon Polytechniou 9 Zografou 15773 Athens Greece Department of Electrical and Computer Engineering University of Maryland College Park MD 20742 United States Department of Information and Communication Systems Engineering University of the Aegean Karlovasi 83200 Samos Greece

No abstract available

ISBN: (纸本)1424400848

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Stable, time-bound object references in context of dynamically changing environments

Stable, time-bound object references in context of dynamical...

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International Conference on distributed Computing systems Workshop

作者： R. Kapitza H.P. Reiser F.J. Hauck Department of Computer Science s Informatik 4 University Erlangen-Nuünberg Germany Distributed Systems Laboratory University of Ulm (EBS) Germany

Most middleware platforms lack sufficient support to provide reliable references for accessing distributed mobile objects in the context of dynamic environments, or they heavily depend on infrastructure mechanisms like a globally available location service. Based on the fragmented-object model and on our own middleware implementation AspectIX, this paper presents concepts and mechanisms that avoid outdated references for dynamically distributed objects without additional infrastructure services. Our approach is based on time-bound guarantees. Even in the context of malicious nodes and a partial invalidation of references a safe binding of the distributed object is guaranteed if ever possible.

关键词： Fault tolerance Middleware Peer to peer computing Context-aware services Mobile computing Scalability computer architecture Programming profession Redundancy Fault detection

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Adaptive carrier sensing and packet sending - An alternative to boost the performance in directional communications

Adaptive carrier sensing and packet sending - An alternative...

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6th International Conference on Parallel and distributed Computing, Applications and Technologies, PDCAT 2005

作者： Bordim, Jacir L. Hunziker, T. Nakano, K. Department of Computer Science University of Brasilia Brasilia-DF 70910900 Brazil ATR Department of Wireless Communication Systems 2-2-2 Hikaridai Keihanna Sci. City Kyoto 619-0288 Japan Department of Artificial Complex Systems Engineering School of Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hirhoshima 739-8527 Japan

ISBN: (纸本)0769524052

Despite the efforts to leverage the network performance through the use of Directional communications, most protocols still rely on the basic mechanisms employed by the IEEE802.11 standards. While this might be desirable to facilitate compatibility, nodes empowered with directional antennas should be able to explore the benefits of directional communications whenever possible. With that in mind, we propose two mechanisms, termed Adaptive Carrier Sensing and Adaptive Packet Sending, aiming to allow nodes equipped with directional antennas to exploit the advantages of such systems to improve network performance. © 2005 IEEE.

关键词： communication systems

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Design and implementation of a highperformance network intrusion prevention system

Design and implementation of a highperformance network intru...

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20th IFIP International Information Security Conference, IFIP/SEC 2005

作者： Xinidis, Konstantinos Anagnostakis, Kostas G. Markatos, Evangelos P. Institute of Computer Science Foundation for Research and Technology Hellas P.0 Box 1385 Heraklio GR-711-10 Greece Distributed Systems Laboratory CIS Department Univ. of Pennsylvania 200 S. 33rd Street PhiladelphiaPA19104 United States

ISBN: (纸本)038725658X

Network intrusion prevention systems provide proactive defense against security threats by detecting and blocking attack-related traffic. This task can be highly complex, and therefore, software-based network intrusion prevention systems have difficulty in handling high speed links. This paper describes the design and implementation of a high-performance network intrusion prevention system that combines the use of software-based network intrusion prevention sensors and a network processor board. The network processor acts as a customized load balancing splitter that cooperates with a set of modified content-based network intrusion detection sensors in processing network traffic. We show that the components of such a system, if co-designed, can achieve high performance, while minimizing redundant processing and communication. We have implemented the system using low-cost, off-theshelf technology: an IXP1200 network processor evaluation board and commodity PCs. Our evaluation shows that our enhancements can reduce the processing load of the sensors by at least 45% resulting in a system that can handle a fully-loaded Gigabit Ethernet link using at most four commodity PCs. Copyright © 2005 by International Federation for Information Processing.

关键词： Intrusion detection

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