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IEEE International Conference on parallel and distributed Computing, Applications and Technologies (PDCAT)

作者： Juan A. Lorenzo Francisco F. Rivera Peter Tuma Juan C. Pichel Computer Architecture Group Electronics and Computer Science Department University of Santiago de Compostela Spain Distributed Systems Research Group Department of Software Engineering Charles University Prague Czech Republic Galicia Supercomputing Centre Santiago de Compostela Spain

This work presents a study undertaken to characterise the FINISTERRAE supercomputer, one of the biggest NUMA systems in Europe. The main objective was to determine the performance effect of bus contention and cache coherency as well as the suitability of porting strategies regarding irregular codes in such a complex architecture. Results show that: (1) cores which share a socket can be considered as independent processors in this context; (2) for big data sizes, the effect of sharing a bus degrades the final performance but masks the cache coherency effects; (3) the NUMA factor (remote to local memory latency ratio) is an important factor on irregular codes and (4) the default kernel allocation policy is not optimal in this system. These results allow us to understand the behaviour of thread-to-core mappings and memory allocation policies.

关键词： Yarn Supercomputers Delay Europe Sockets Kernel Sparse matrices distributed computing Application software computer architecture

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Enforcing integrity of agent migration paths by distribution of trust

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International Journal of Intelligent Information and Database systems 2009年第4期3卷 382-396页

作者： Warnier, Martijn Oey, Michel Timmer, Reinier Brazier, Frances Overeinder, Benno Intelligent Interactive Distributed Systems Group Department of Computer Science VU University Amsterdam de Boelelaan 1081a 1081 HV Amsterdam Netherlands NLnet Labs Kruislaan 419 1098 VA Amsterdam Netherlands

Agent mobility is the ability of an agent to migrate from one location to another across a network. Though conceptually relatively straightforward, in practice security of mobile agents is a challenge: from transport layer security to preservation of integrity in open environments. This paper discusses the security issues involved and proposes protocols for secure agent migration. AgentScape, an agent platform for mobile agents, is used to illustrate the feasibility of the implementation of these protocols. Copyright © 2009 nderscience Enterprises Ltd.

关键词： Mobile agents

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DeCoMAS: An Architecture for Supplementing MAS with Systemic Models of Decentralized Agent Coordination

DeCoMAS: An Architecture for Supplementing MAS with Systemic...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Jan Sudeikat Wolfgang Renz Distributed Systems and Information Systems (VSIS) Group Department of Informatics Faculty of Mathematics Informatics and Natural Sciences University of Hamburg Hamburg Germany Multimedia Systems Laboratory (MMLab) Faculty of Engineering and Computer Science Hamburg University of Applied Sciences Hamburg Germany

The systematic conception of decentralized and self-adaptive software systems, as demanded for the run-time management of today’s distributed, multi-tier software architectures, is an active research area. Here, we discuss a coordination architecture that facilitates the enactment of externalized coordination models in Multi-agent systems (MAS). Coordination is configured by systemic models, i.e. structures of agent-behaviour interdependencies that denote the mutual influences of agent activities. The systematic, iterative application development is supported by a non-intrusive integration approach that enables developers to adjust application dynamics by complementing agent-based applications with systemic coordination models.

关键词： Application software Intelligent agent Software systems Feedback loop computer architecture Multiagent systems Software engineering Informatics Collaborative software Conferences

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Building a case for FIPA compliant multiagent approaches for wireless sensor networks 1

Building a case for FIPA compliant multiagent approaches for...

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1st Workshop on Software Organisation and MonIToring of Ambient systems, SOMITAS 2008

作者： Nawaz, Khalid Buchmann, Alejandro P. Databases and Distributed Systems Group Department of Computer Science TU Darmstadt Germany

There have been some efforts to apply agent based approaches in Wireless Sensor Networks (WSNs) for different applica- tion scenarios in recent past. These efforts have met with varying levels of success so far. However, the efforts to assess the suitability of Foundation for Intelligent Physical Agents (FIPA) compliant multiagent solutions for WSNs are almost non-existent. In this paper we present a scenario from an industrial domain and asses the suitability of a FIPA compli- ant multiagent based solution for it. The scenario is based on a WSN deployment in an underground mine where it could be put to use for several purposes like hazardous gas plume detection and tracking, mine lighting control, Proximate En- vironment Monitoring (PEM), structural health monitoring of mine structure, to name a few. However, we only consider the PEM usage scenario in this paper. Copyright ACM 2007.

关键词： Multi agent systems

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Automatic loop transformation selection with the Aid of kohonen's self-organizing maps for parallelizing compilers

Automatic loop transformation selection with the Aid of koho...

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2008 International Conference on parallel and distributed Processing Techniques and Applications, PDPTA 2008

作者： Mead, Mohamed Ahamed Eldeeb, Hesham Nassar, Salwa Computer Science Mathematics Department Faculty of Science Cairo University Cairo Egypt Computers and Systems Department Electronics Research Institute Dokki Giza Egypt Head of Parallel and Distributed Systems Team Computers and Systems Department Electronics Research Institute Dokki Giza Egypt

ISBN: (纸本)1601320841

Determine the appropriate loop transformations is an essential process in the automatic parallelization field. The sequence of loop transformation to be applied also must be considered. Selection of loop transformations faces many challenges, it is needed an experienced. In this paper, An Intelligent Loop Transformation Selector (ILTS);as a part of parallelizing tool project, was developed to overcome on these challenges and imitate an experienced. A Kohonen's Self-Organizing Map (SOM) neural network is used to select the appropriate loop transformation or sequence of them. Neural Networks offer intelligent transformations selection to reduce or eliminate the dependencies and maximize the parallelization in the sequential code. The experimental results show that ILTS chooses loop transformations successfully in most cases. This tool can be integrated with any parallelizing compiler to enhance loop transformation selection process.

关键词： Conformal mapping

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A Multi-Perspective Taxonomy for Systematic Classification of Grid Faults

A Multi-Perspective Taxonomy for Systematic Classification o...

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16th Euromicro Conference on parallel, distributed and Network-Based Processing (PDP 2008)

作者： Jurgen Hofer Thomas Fahringer Distributed and Parallel Systems Group Institute of Computer Science University of Innsbruck Innsbruck Austria

Classification turns chaotic knowledge into regularity by systematizing a domain and providing a common vocabulary. Currently there is a lack of systematic and comprehensive studies in organization and classification of Grid faults. We address this gap with a multi-perspective Grid fault taxonomy describing an incident using eight different characteristics. It is hard to define a taxonomy of broad validity and acceptance that satisfies the vast number of requirements of the many Grid user communities. Nevertheless we proof that our taxonomy can serve as a solid basis for defining project-specific custom classification schemes by giving a concrete example created for a state-of-the-art Grid middleware environment.

关键词： Taxonomy Ontologies Vocabulary Middleware Solids Concrete Error correction Security Web services Testing

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Models and aspects - Handling crosscutting concerns in MDSD

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21st European Conference on Object-Oriented Programming, ECOOP 2007

作者： Jackson, Andrew Groher, Iris Schwanninger, Christa Völter, Markus Distributed Systems Group Department of Computer Science Trinity College Dublin 2 Ireland Siemens AG Corporate Technology Munich Germany Independent Consultant Heidenheim Germany

ISBN: (纸本)3540781943

This report summarizes the presentations and discussions of the Third Workshop on Models and Aspects Handling Crosscutting Concerns in MDSD, held in conjunction with the 21st European Conference on Object-Oriented Programming (ECOOP) in Berlin, Germany on July, 31, 2007. This workshop was motivated by the fact that both Model-Driven Software Development (MDSD) and Aspect-Oriented Software Development (AOSD) are important new paradigms that both promise to change the way software is developed. Both approaches provide opportunities for concern separation. AOSD separates concerns horizontally and MDSD enables concern separation vertically. This workshop identified two key integration strategies to achieve the complementary benefits of both aspect-oriented and model-driven development. The first is the use of aspects within transformation languages to separate transformational concerns making model transformations easier to write. The second is the separation of concerns within models defined as aspects. This workshop established the key benefits of these. The major benefit of the first is easing the complexity of development and maintainability of transformations. The major benefit of the second is means to reduce the problems associated with aspects, such as, aspect interactions, fragile pointcuts and understandability. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： Object oriented programming

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Modelling an emergency vehicle early-warning system using real-time feedback

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International Journal of Intelligent Information and Database systems 2008年第2期2卷 222-239页

作者： Senart, Aline Bouroche, Meálanie Cahill, Vinny Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland

Emergency vehicles, while usually equipped with warning devices, are still often impeded by other traffic and involved in numerous collisions. Current research is investigating the use of wireless communication from emergency vehicles to warn other traffic. However, communication in dynamic wireless networks is not reliable. In this paper, we propose a novel emergency vehicle early-warning system that relies on wireless technology to inform other vehicles of the arrival of emergency vehicles, and returns feedback in real-time when communication degrades. We describe how such a system is built with Comhordu, a coordination model for wireless networks. © 2008, Inderscience Publishers.

关键词： Alarm systems

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Using Sensor Networks for Pedestrian Detection

Using Sensor Networks for Pedestrian Detection

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Aline Senart Marcin Karpinski Maciej Wieckowski Vinny Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

Pedestrian safety is a major concern in road transportation as pedestrian/vehicle accidents account for the second largest cause of traffic-related injuries and fatalities worldwide. Considerable work has examined the use of lidar, radar and computer vision for pedestrian detection but existing solutions are costly and work only if pedestrians are in the vehicle's line-of-sight. In this paper, we present a novel technique based on wireless sensor networks that is cheap and enables pedestrian detection beyond the driver's horizon. The detection system is based on the use of "cat's eyes" augmented with embedded processing and communication capabilities that are able to detect pedestrians and forward this information along the road. We describe how such a system was successfully built with SOL, a high-level programming language for wireless sensor networks. Initial results show that the system obtains detection rates of 100%, false positive rates of 0%, and that the precision of the estimated position of pedestrians depends on their heading and relative position to sensor nodes.

关键词： Radar detection Road safety Vehicle safety Wireless sensor networks Road transportation Road vehicles Road accidents Telecommunication traffic Injuries Laser radar

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SPP1148 booth: Hyperreconfigurable architectures

SPP1148 booth: Hyperreconfigurable architectures

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International Conference on Field Programmable Logic and Applications

作者： Sebastian Lange Martin Middendorf Parallel Computing and Complex Systems Group Department of Computer Science University of Leipzig Germany

ISBN: (纸本)9781424419606

Dynamically reconfigurable hardware offers promising possibilities for flexible, computation intensive applications. With the technological advance of reconfigurable hardware came a rapid growth in the number of resources per chip requiring large amounts of data transfer per reconfiguration. Especially run-time reconfigurable applications, which make frequent use of reconfiguration, suffer from the growing overhead induced thereby. In this project, we investigate novel concepts for reconfigurable architectures that can dynamically reconfigure the actual reconfiguration potential to reduce the total amount of reconfiguration data that is necessary for a computation.

关键词： computer architecture Computational modeling Hardware Reconfigurable architectures Polynomials Control systems Conferences

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