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Proceedings - Seventh IEEE International Symposium on Object-Oriented Real-Time distributed Computing

作者： Tsang, Shiu Lun Clarke, Siobhán Baniassad, Elisa Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin 2 Ireland

ISBN: (纸本)076952124X

Some concerns, such as debugging or logging functionality, cannot be captured cleanly, and are often tangled and scattered throughout the code base. These concerns are called crosscutting concerns. Aspect-Oriented Programming (AOP) is a paradigm that enables developers to capture crosscutting concerns in separate aspect modules. The use of aspects has been shown to improve understandability and maintainability of systems. It has been shown that real-time concerns, such as memory management and thread scheduling, are crosscutting concerns [5, 6, 9, 11]. However it is unclear whether encapsulating these concerns provides benefits. We were interested in determining whether using AOP to encapsulate real-time crosscutting concerns afforded benefits in system properties such as understandability and maintainability. This paper presents research comparing the system properties of two systems: a real-time sentient traffic simulator and its Aspect-Oriented equivalent. An evaluation of AOP is presented indicating both benefits and drawbacks with this approach.

关键词： Java programming language

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Music2Share - Copyright-compliant music sharing in P2P systems

Music2Share - Copyright-compliant music sharing in P2P syste...

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作者： Kalker, Ton Epema, Dick H. J. Hartel, Pieter H. Lagendijk, R.L. Van Steen, Maarten Philips Research Eindhoven Eindhoven 5656 AA Netherlands Technical University Eindhoven Eindhoven 5612 AZ Netherlands Parallel and Distributed Systems Group Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft 2600 GA Netherlands Distributed and Embedded Systems Group Department of Computer Science University of Twente Enschede 7500 AE Netherlands Delft University of Technology Delft 2628 CD Netherlands Department of Computer Science Vrije Universiteit Amsterdam 1081 HV Netherlands

Peer-to-peer (P2P) networks are generally considered to be free havens for pirated content, in particular with respect to music. We describe a solution for the problem of copyright infringement in P2P networks for music sharing. In particular, we propose a P2P protocol that integrates the functions of identification, tracking, and sharing of music with those of licensing, monitoring, and payment. This highly decentralized music-aware P2P protocol will allow access to large amounts of music of guaranteed quality;it merges in a natural way the policing functions for copyright protection·and an efficient music-management infrastructure for the benefit of the user. © 2004 IEEE.

关键词： Copyrights

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A hierarchical particle swarm optimizer for dynamic optimization problems

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European Workshop on Applications of Evolutionary Computation, EvoWorkshops 2004: EvoBIO, EvoCOMNET, EvoHOT, EvoIASP, EvoMUSART, and EvoSTOC

作者： Janson, Stefan Middendorf, Martin Parallel Computing and Complex Systems Group Department of Computer Science University of Leipzig Augustusplatz 10/11 LeipzigD-04109 Germany

ISBN: (纸本)9783540213789

Particle Swarm Optimization (PSO) methods for dynamic function optimization are studied in this paper. We compare dynamic variants of standard PSO and Hierarchical PSO (H-PSO) on different dynamic benchmark functions. Moreover, a new type of hierarchical PSO, called Partitioned H-PSO (PH-PSO), is proposed. In this algorithm the hierarchy is partitioned into several sub-swarms for a limited number of generations after a change occurred. Different methods for determining the time when to rejoin the hierarchy and how to handle the topmost sub-swarm are discussed. The test results show that H-PSO performs significantly better than PSO on all test functions and that the PH-PSO algorithms often perform best on multimodal functions where changes are not too severe. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Particle swarm optimization (PSO)

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End-to-end trust starts with recognition

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 2802卷 130-142页

作者： Seigneur, Jean-Marc Farrell, Stephen Jensen, Christian Damsgaard Gray, Elizabeth Chen, Yong Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin 2 Ireland

Pervasive computing requires some level of trust to be established between entities. In this paper we argue for an entity recognition based approach to building this trust which differs from starting from more traditional authentication methods. We also argue for the concept of a "pluggable" recognition module which allows different recognition schemes to be used in different circumstances. Finally, we propose that the trust in the underlying infrastructure has to be taken into account when considering end-to-end trust. © Springer-Verlag 2004.

关键词： Ubiquitous computing

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An evaluation of aspect-oriented programming for Java-based real-time systems development

An evaluation of aspect-oriented programming for Java-based ...

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International Symposium on Object-Oriented Real-Time distributed Computing

作者： Shiu Lun Tsang S. Clarke E. Baniassad Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland

Some concerns, such as debugging or logging functionality, cannot be captured cleanly, and are often tangled and scattered throughout the code base. These concerns are called crosscutting concerns. Aspect-oriented programming (AOP) is a paradigm that enables developers to capture crosscutting concerns in separate aspect modules. The use of aspects has been shown to improve understandability and maintainability of systems. It has been shown that real-time concerns, such as memory management and thread scheduling, are crosscutting concerns [A. Corsaro et al., (2002), *** et al., (2001), A. Gal et al., (2002)]. However it is unclear whether encapsulating these concerns provides benefits. We were interested in determining whether using AOP to encapsulate real-time crosscutting concerns afforded benefits in system properties such as understandability and maintainability. This paper presents research comparing the system properties of two systems: a real-time sentient traffic simulator and its aspect-oriented equivalent. An evaluation of AOP is presented indicating both benefits and drawbacks with this approach

关键词： Java Real time systems Scattering Debugging Traffic control System testing Domain specific languages Object oriented modeling computer science Educational institutions

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Behind the rules: XP experiences

Behind the rules: XP experiences

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Agile Development Conference

作者： A. Jackson Shiu Lun Tsang A. Gray C. Driver S. Clarke Distributed Systems Group Computer Science Department Trinity College Dublin Dublin Ireland

Agile processes such as XP (extreme programming) have been recognised for their potential benefits of improving software. During adoption of the XP process, teams can misapply the XP principles by following them verbatim, ignoring the context in which they are applied. In this paper we document our experiences where naive applications of XP principles were altered in recognition of context. We detail our observations of how teams "looked behind" the rules and began fitting XP to the problem rather than attempting to fit the problem to XP. We conclude by reflectively focusing on how this transformation occurred and suggest that it is buying into the XP ethos that drives this change of perspective on the XP process and principles.

关键词： Educational institutions Testing computer science Application software Functional programming computer bugs Programming profession Cost function Code standards Standards development

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A framework for developing mobile, context-aware applications

A framework for developing mobile, context-aware application...

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IEEE International Conference on Pervasive Computing and Communications (PerCom)

作者： G. Biegel V. Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland

The emergence of truly ubiquitous computing, enabled by the availability of mobile, heterogenous devices that supply context information, is currently hampered by the lack of programming support for the design and development of context-aware applications. We have developed a framework which significantly eases the development of mobile, context-aware applications. The framework allows developers to fuse data from disparate sensors, represent application context, and reason efficiently about context, without the need to write complex code. An event based communication paradigm designed specifically for ad-hoc wireless environments is incorporated, which supports loose coupling between sensors, actuators and application components.

关键词： Context Ubiquitous computing Mobile communication Application software Actuators Intelligent sensors Mobile computing Centralized control Sensor phenomena and characterization Multimodal sensors

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Using stigmergy to co-ordinate pervasive computing environments

Using stigmergy to co-ordinate pervasive computing environme...

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IEEE Workshop on Mobile Computing systems and Applications (WMCSA)

作者： P. Barron V. Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland

Pervasive computing environments have proven difficult to develop in a form that supports the integration and organisation of devices and applications in a spontaneous and transparent manner. This is partly due to the highly dynamic and unpredictable nature of these types of environments, and is often further hampered by the limited resources found on devices. In this paper, we present a highly decentralized method of organising the components of a pervasive computing environment, supporting spontaneous interaction between entities and providing robust system-wide behavior. Our inspiration for this work stems from nature and the observations made by the French biologist Grasse on how social insects coordinate their actions using indirect communication via the environment, a phenomenon that has become known as stigmergy. In the stigmergic approach there are fewer dependences between entities allowing for the incremental construction and improvement of solutions without adversely effecting the rest of the pervasive computing environment. The approach is encapsulated in Cocoa, a framework that supports the use of stigmergy to build self-organising environments that promotes the autonomy of entities. Experience using Cocoa has shown that entities can be integrated into a pervasive computing environment in a spontaneous manner and that coordinated behavior can emerge.

关键词： Pervasive computing Insects Robustness Application software Space technology computer science Educational institutions Microcomputers Fabrics Particle swarm optimization

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Generic Environment for Full Automation of Benchmarking 1

Generic Environment for Full Automation of Benchmarking

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Testing of Component-Based systems and Software Quality, 1st International Workshop on Software Quality, SOQUA 2004 and Workshop Testing Component-Based systems, TECOS 2004

作者： Kalibera, Tomáš Bulej, Lubomír Tůma, Petr Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Malostranské nám. 25 Prague118 00 Czech Republic Institute of Computer Science Czech Academy of Sciences Pod Vodárenskou věží 2 Prague182 07 Czech Republic

ISBN: (纸本)3885793873

Regression testing is an important part of software quality assurance. We work to extend regression testing to include regression benchmarking, which applies benchmarking to detect regressions in performance. Given the specific requirements of regression benchmarking, many contemporary benchmarks are not directly usable in regression benchmarking. To overcome this, we present a case for designing a generic benchmarking environment that will facilitate the use of contemporary benchmarks in regression benchmarking, analyze the requirements and propose architecture of such an environment. © 2004 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Benchmarking

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A peer-to-peer mechanism for resource location and allocation over the grid 04

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Proceedings of the Second international conference on parallel and distributed Processing and Applications

作者： Hung-Chang Hsiao Mark Baker Chung-Ta King Computer and Communication Research Center National Tsing-Hua University Taiwan The Distributed Systems Group University of Portsmouth UK Department of Computer Science National Tsing-Hua University Taiwan

ISBN: (纸本)9783540241287

Recent advances in P2P lookup overlays provide an appealing solution for distributed search without relying on a single database server. In addition to performing resource discovery, these P2P substrates also offer membership management for dynamic peers. In this paper, we propose a publicly shared architecture called VC2A that takes advantage of a P2P lookup substrate for computational applications. VC2A targets computational master-slave applications. An application running in VC2A dynamically allocates resources from the system on the fly. These allocated resources then self-manage and -heal. We have implemented an architecture based on our previous efforts that include an enhanced P2P lookup overlay and a mobile agent system on top of this overlay. We show that VC2A is not only scalable but robust, and takes advantage of heterogeneity of the resources.

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