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21st International Conference on Parallel and Distributed computing and Communication systems, PDCCS 2008

作者： Hurley, R.T. Li, B.Y. Department of Computing and Information Systems Trent University PeterboroughON Canada Software Tester Land Software Engineering Centre OttawaON Canada

ISBN: (纸本)9781605604480

Web caching has been determined to be an effective technique to improve performance in a Web-based environment. An increasing proportion of documents delivered over the Internet are becoming dynamic in nature in that the content presented is time-sensitive or it has been tailored for specific clients. Thus a request for such a Web page may not be satisfied by a page in a Web cache as its content is stale (out-of-date or not applicable to this user). The net effect is that dynamic content Web pages can be detrimental to the performance of a Web caching system as requests for these pages must be satisfied by fetching the page from the originating server. In this paper, we examine the effect of dynamic content on a partitioned and unified Web caching system. In partitioned Web caching, storage space is divided into two areas where one area is designated for large files (such as audio and video) while the other area is utilized for small files (such as images and text). Using simulation as the tool, the effect of dynamic content web pages will be examined in a partitioned as well as a unified (non-partitioned) caching environment. Copyright © 2008 by the International Society for Computers and Their Applications (ISCA). All rights reserved.

关键词： Websites

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Natural strategies for search

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Natural computing 2008年第3期8卷 547-570页

作者： Banks, Alec Vincent, Jonathan Phalp, Keith Software Systems Research Centre School of Design Engineering and Computing Bournemouth University Poole Dorset UK

In recent years a considerable amount of natural computing research has been undertaken to exploit the analogy between, say, searching a given problem space for an optimal solution and the natural process of foraging for food. Such analogies have led to useful solutions in areas such as optimisation, prominent examples being ant colony systems and particle swarm optimisation. However, these solutions often rely on well defined fitness landscapes that are not always be available in more general search scenarios. This paper surveys a wide variety of behaviours observed within the natural world, and aims to highlight general cooperative group behaviours, search strategies and communication methods that might be useful within a wider computing context, beyond optimisation, where information from the fitness landscape may be sparse, but new search paradigms could be developed that capitalise on research into biological systems that have developed over millennia within the natural world.

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Towards context aware adaptation in wireless networks

Towards context aware adaptation in wireless networks

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2nd International Conference on Mobile Ubiquitous computing, systems, Services and Technologies, UBICOMM 2008

作者： Kodikara, Ruwini Åhlund, Christer Zaslavsky, Arkady Centre for Distributed Systems and Software Engineering Monash University 900 Dandenong Road Caulfield East Melbourne VIC 3145 Australia Division of Mobile Networking and Computing Luleå University of Technology 931 87 Skellefteå Sweden

ISBN: (纸本)9780769533674

Next generation ubiquitous computing will comprise of context aware adaptive applications and protocols. There is a need of a generic architecture to cater for the adaptation requirements of increasingly demanding real-time applications and increasing dynamic wireless networks. This paper discusses the adaptive approach supported by CA3RM-Com architecture. CA3RM-Com is the context aware architecture proposed for real-time communication in wireless networks. It addresses the context representation, context acquisition, context exchange, and context management. Specific details of the architecture and referring adaptations that CA3RM-Com can support are discussed. Moreover the extended simulation results of adaptive multi-homed Mobile IP are presented in this paper. © 2008 IEEE.

关键词： Wireless networks

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Supporting adaptive real-time mobile communication with multilayer context awareness

IFIP Advances in Information and Communication Technology

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IFIP Advances in Information and Communication Technology 2008年 284卷 435-446页

作者： Kodikara, Ruwini AÅhlund, Christer Zaslavsky, Arkady Centre for Distributed Systems & Software Engineering Monash University Australia Division of Mobile Networking & Computing Luleå University of Technology Sweden

ISBN: (纸本)9780387848389

Real time mobile communication is challenging due to the inherent limitations of mobile networks. On the other hand the stringent quality of service requirements of real time traffic is highly in demand. Our first contribution is the generic context aware architecture for adaptive real time applications. Adaptation is based on the awareness of context parameters from different layers of the existing protocol stack which involves context exchange among the neighboring layers as well as non-neighboring layers. The architecture comprises of context representation, context acquisition, cross-layer context exchange and context management. Our second contribution is the mobility aware, adaptive Multi-homed Mobile IP. Simulation of adaptive M-MIP was carried out as a proof of concept. Simulation demonstrated that adaptation to mobility was able to decrease Mobile IP handover latency. Further, the results show that the quality of service of real time traffic can be enhanced by using context aware adaptive MIP. The simulation involved with various speeds ranging from pedestrian scenarios to vehicular scenarios. Results are analyzed with variable data rates. The evaluations show that performance of the proposed solution is better compared to conventional MIP in terms of packet loss and throughput of real time traffic. © 2008 IFIP International Federation for Information Processing.

关键词： Quality of service

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You Can't Get There From Here! Problems and Potential Solutions in Developing New Classes of Complex Computer systems

You Can't Get There From Here! Problems and Potential Soluti...

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International Multiconference on Computer Science and Information Technology, IMCSIT

作者： Michael G. Hinchey James L. Rash Walter F. Truszkowski Roy Sterritt Christopher A. Rouff Lero-the Irish Software Engineering Research Centre University of Limerick Limerick Ireland Systems Engineering Division NASA Goddard Space Flight Center Greenbelt MD USA School of Computing and Mathematics University of Ulster UK Lockheed Martin Advanced Technology Laboratories Arlington VA USA

The explosion of capabilities and new products within the sphere of Information Technology (IT) has fostered widespread, overly optimistic opinions regarding the industry, based on common but unjustified assumptions of quality and correctness of software. These assumptions are encouraged by software producers and vendors, who at this late date have not succeeded in finding a way to overcome the lack of an automated, mathematically sound way to develop correct systems from requirements. NASA faces this dilemma as it envisages advanced mission concepts that involve large swarms of small spacecraft that will engage cooperatively to achieve science goals. Such missions entail levels of complexity that beg for new methods for system development far beyond todaypsilas methods, which are inadequate for ensuring correct behavior of large numbers of interacting intelligent mission elements. New system development techniques recently devised through NASA-led research will offer some innovative approaches to achieving correctness in complex system development, including autonomous swarm missions that exhibit emergent behavior, as well as general software products created by the computing industry.

关键词： NASA Space technology Computer industry Information technology software engineering software maintenance software safety Computer science Laboratories Aerospace industry

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Using Program Slicing to Identify Faults in software:

Using Program Slicing to Identify Faults in Software:

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Beyond Program Slicing 2005

作者： Black, Sue Counsell, Steve Hall, Tracy Wernick, Paul Centre for Systems and Software Engineering London South Bank University 103 Borough Road LondonSE1 0AA United Kingdom Department of Information Systems and Computing Brunel University Middlesex UxbridgeUB8 3PH United Kingdom School of Computer Science University of Hertfordshire Herts Hatfield United Kingdom

This study explores the relationship between program slices and faults. The aim is to investigate whether the characteristics of program slices can be used to identify faultprone software components. Slicing metrics and dependence clusters are used to characterise the slicing profile of a software component, then the relationship between the slicing profile of the component and the faults in that component are then analysed. Faults can increase the likelihood of a system becoming unstable causing problems for the development and evolution of the system. Identifying faultprone components is difficult and reliable predictors of fault-proneness not easily identifiable. Program slicing is an established software engineering technique for the detection and correction of specific faults. An investigation is carried out into whether the use of program slicing can be extended as a reliable tool to predict fault-prone software components. Preliminary results are promising suggesting that slicing may offer valuable insights into fault-proneness. © 2006 Dagstuhl Seminar Proceedings. All rights reserved.

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Semantic-based Grid Resource Discovery and its Integration with the Grid Service Broker

Semantic-based Grid Resource Discovery and its Integration w...

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International Conference on Advanced computing and Communications (ADCOM)

作者： Thamarai Selvi Somasundaram R.A. Balachandar Vijayakumar Kandasamy Rajkumar Buyya Rajagopalan Raman N. Mohanram S. Varun Department of Information Technology Anna University Chennai India Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia Centre for Development of Advanced Computing Chennai India Centre for Development of Advanced Computing Bangalore India

This paper addresses the need of semantic component in the grid environment to discover and describe the grid resources semantically. We propose semantic grid architecture by introducing a knowledge layer at the top of Gridbus broker architecture and thereby enabling broker to discover resources semantically. The semantic component in the knowledge layer enables semantic description of grid resources with the help of ontology template. The ontology template has been created using Protege-OWL editor for different types of computing resources in the grid environment. The Globus Toolkit's MDS is used to gather grid resource information and Protege-OWL libraries are used to dynamically create knowledge base of grid resources. Algernon inference engine is used for interacting with the knowledge base to discover suitable resources.

关键词： Distributed computing Ontologies Middleware Computer architecture Computer networks Grid computing Libraries Engines Monitoring Aggregates

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Measuring ripple effect for the object oriented paradigm

Measuring ripple effect for the object oriented paradigm

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IASTED International Conference on software engineering: part of the 23rd IASTED International Multi-Conference on Applied Informatics, SE 2005

作者： Rosner, Peter Black, Sue Centre for Systems and Software Engineering Faculty of Business Computing and Information Management London South Bank University 103 Borough Road London SE1 0AA United Kingdom

ISBN: (纸本)0889864640

The computation of ripple effect is based on the effect that a change to a single variable will have on the rest of a program, it determines the scope of the change and provides a measure of the program's complexity. Previous research has shown that measurement of ripple effect can give us valuable information about procedural software. This paper explores the applicability of ripple effect to measuring object oriented code, particularly C++. Extensions are proposed to the computation of the ripple effect to accommodate aspects of the object oriented paradigm.

关键词： Object oriented programming

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A robust search-based approach to project management in the presence of abandonment, rework, error and uncertainty

A robust search-based approach to project management in the ...

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International Symposium on software Metrics

作者： G. Antoniol M. Di Penta M. Harman Department of Engineering RCOST-Research Centre on Software Technology University of Sannio Benevento Italy Department of Information Systems and Computing Brunei University Uxbridge UK

Managing a large software project involves initial estimates that may turn out to be erroneous or that might be expressed with some degree of uncertainty. Furthermore, as the project progresses, it often becomes necessary to rework some of the work packages that make up the overall project. Other work packages might have to be abandoned for a variety of reasons. In the presence of these difficulties, optimal allocation of staff to project teams and teams to work packages is far from trivial. This paper shows how genetic algorithms can be combined with a queuing simulation model to address these problems in a robust manner. A tandem genetic algorithm is used to search for the best sequence in which to process work packages and the best allocation of staff to project teams. The simulation model, that computes the project estimated completion date, guides the search. The possible impact of rework, abandonment and erroneous or uncertain initial estimates are characterised by separate error distributions. The paper presents results from the application of these techniques to data obtained from a large scale commercial software maintenance project.

关键词： Robustness Project management Uncertainty Packaging software maintenance Genetic algorithms Computer errors Computational modeling Application software Large-scale systems

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Search-based techniques for optimizing software project resource allocation

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3103卷 1425-1426页

作者： Antoniol, G. Di Penta, M. Harman, M. RCOST - Research Centre on Software Technology University of Sannio Department of Engineering Palazzo ex Poste Via Traiano 82100 Benevento Italy Department of Information Systems and Computing Brunel University Uxbridge Middlesex UB8 3PH United Kingdom

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