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M-Grid: Using ubiquitous web technologies to create a computational grid

M-Grid: Using ubiquitous web technologies to create a comput...

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European Grid Conference on Advances in Grid Computing - EGC 2005

作者： Walters, Robert John Crouch, Stephen Declarative Systems and Software Engineering Group Department of Electronics and Computer Science University of Southampton SO17 1BJ United Kingdom

There are many potential users and uses for grid computing. However, the concept of sharing computing resources excites security concerns and, whilst being powerful and flexible, at least for novices, existing systems are complex to install and use. Together these represent a significant barrier to potential users who are interested to see what grid computing can do. This paper describes M-grid, a system for building a computational grid which can accept tasks from any user with access to a web browser and distribute them to almost any machine with access to the internet and manages to do this without the installation of additional software or interfering with existing security arrangements. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Distributed computer systems

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Implementing hierarchical features in a graphically based formal modelling language

Implementing hierarchical features in a graphically based fo...

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Proceedings of the 28th Annual International Computer software and Applications Conference, COMPSAC 2004

作者： Henderson, Peter Walters, Robert John Crouch, Stephen Declarative Systems and Software Engineering Group Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ United Kingdom

Many developers who could benefit from building and analysing formal models of their systems are deterred from doing so by the process algebra style input languages of formal modelling languages which they find difficult to read and understand. This barrier to the adoption of formal modelling techniques can be significantly reduced if the process algebra is replaced with a graphical notation supported by a model generation tool. However, whilst having a diagrammatic base for the language appeals to the novice modeller, the diagrams can become cluttered for larger models. In this paper we address the issues of how to add hierarchical features to a graphical language without losing the fundamental benefits and appeal of a having the graphical interface to the language. We illustrate these ideas using an existing formal modelling language. © 2004 IEEE.

关键词： Formal languages

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Implementing hierarchical features in a graphically based formal modelling language

Implementing hierarchical features in a graphically based fo...

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IEEE Annual International Computer software and Applications Conference (COMPSAC)

作者： P. Henderson R.J. Walters S. Crouch Declarative Systems and Software Engineering Group Department of Electronics and Computer Science University of Southampton Southampton UK

Many developers who could benefit from building and analysing formal models of their systems are deterred from doing so by the process algebra style input languages of formal modelling languages which they find difficult to read and understand. This barrier to the adoption of formal modelling techniques can be significantly reduced if the process algebra is replaced with a graphical notation supported by a model generation tool. However, whilst having a diagrammatic base for the language appeals to the novice modeller, the diagrams can become cluttered for larger models. In this paper we address the issues of how to add hierarchical features to a graphical language without losing the fundamental benefits and appeal of having the graphical interface to the language. We illustrate these ideas using an existing formal modelling language

关键词： Algebra Integrated circuit interconnections software engineering Computer science Buildings Programming Assembly systems Graphical models Electronic circuits Wires

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Using SPIN and STeP to verify business processes specifications

引用

5th International Andrei Ershov Memorial Conference on Perspectives of System Informatics, PSI 2003

作者： Augusto, Juan C. Butler, Michael Ferreira, Carla Craig, Stephen-John Declarative Systems and Software Engineering Research Group Department of Electronics and Computer Science University of Southampton Southampton United Kingdom

ISBN: (纸本)3540208135

Business transactions are prone to failure and having to deal with unexpected situations. Some business process specification languages, e.g. StAC, introduce notions like compensation handling. Given the need of verification of correctness in business related software, it is important to fill in the gap between business process specification languages like StAC and the verification software already available. We report on two of our previous attempts to develop a tool to allow verification of StAC specifications by using already existing systems, SPIN and STeP. We highlight some of the problems we faced during these attempts as they can prevent successful and widespread use of verification tools. Our experience can be used to make the available tools more versatile and hence, useful to a wider range of applications. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Verification

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Datawarp: Building applications which make progress in an inconsistent world

Datawarp: Building applications which make progress in an in...

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4th IFIP WG 6.1 International Conference on Distributed Applications and Interoperable systems, DAIS 2003 held as a joint event in federation with 6th IFIP WG 6.1 International Conference on Formal Methods for Open Object-based Distributed systems, FMOODS 2003

作者： Henderson, Peter Walters, Robert John Crouch, Stephen Ni, Qinglai Declarative Systems and Software Engineering Group Department of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom

ISBN: (纸本)3540205292

The usual approach to dealing with imperfections in data is to attempt to eliminate them. However, the nature of modern systems means this is often futile. This paper describes an approach which permits applications to operate notwithstanding inconsistent data. Instead of attempting to extract a single, correct view of the world from its data, a DataWarp application constructs a collection of interpretations. It adopts one of these and continues work. Since it acts on assumptions, the DataWarp application considers its recent work to be provisional, expecting eventually most of these actions will become definitive. Should the application decide to adopt an alternative data view, it may then need to void provisional actions before resuming work. We describe the DataWarp architecture, discuss its implementation and describe an experiment in which a DataWarp application in an environment containing inconsistent data achieves better results than its conventional counterpart. © IFIP International Federation for Information Processing 2003.

关键词： Artificial intelligence

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Automating checking of models built using a graphically based formal modeling language

Automating checking of models built using a graphically base...

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IEEE Annual International Computer software and Applications Conference (COMPSAC)

作者： R.J. Walters Declarative Systems and Software Engineering Group Department of Electronics and Computer Science University of Southampton Southampton UK

RDT is a graphical formal modeling language in which the modeler works by constructing diagrams of the processes in their model which they join together to form complete systems. Aside from the benefits which accrue as a side effect of building a formal model of a proposed systems, these diagrammatic models can be useful as a means of communication between the development team and the users. However one of the greatest benefits of a formal model is that it can be subjected to rigorous examination to ensure that it satisfies properties required of the system. This paper describes the transformation used by the RDT toolset to generate Promela code (the input language of the SPIN model-checker) automatically from a model.

关键词： Power system modeling Assembly systems software engineering Computer science Buildings Hardware Joining processes Plugs Sockets Computer applications

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Model-based approaches for validating business critical systems

Model-based approaches for validating business critical syst...

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IEEE International Workshop on software Technology and engineering Practice (STEP)

作者： J. Augusto Y. Howard A. Gravell C. Ferreira S. Gruner M. Leuschel Declarative Systems and Software Engineering Research Group Department of Electronics and Computer Science University of Southampton Southampton UK

Developing a business critical system can involve considerable difficulties. This paper describes part of a new methodology that tackles this problem using co-evolution of models and prototypes to strengthen the relationship between modelling and testing. We illustrate how different modelling frameworks, Promela/SPIN and B/ProB/AtellerB, can be used to implement this idea. As a way to reinforce integration between modelling and testing we use model-based tests and trace-driven model checking. As a result we were able to anticipate problems and guide the development of our software in a safer way, increasing our understanding of the system and its reliability.

关键词： Conferences

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Abstract partial deduction challenged (summary)

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2664卷 258-259页

作者： Gruner, Stefan Declarative Systems and Software Engineering Group Department of Electronics and Computer Science University of Southampton SO17 1BJ United Kingdom

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A graphically based language for constructing, executing and analysing models of software systems

A graphically based language for constructing, executing and...

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IEEE Annual International Computer software and Applications Conference (COMPSAC)

作者： R.J. Walters Declarative Systems and Software Engineering Group Department of Electronics and Computer Science University of Southampton Southampton UK

With computer systems becoming ever larger and more complex, the cost and effort associated with their construction is increasing and the systems are now sufficiently complex that developers need help to analyse and understand them. However, at design time, when this understanding is crucial, the system is unavailable because it has yet to be built. Formal, executable models can help with this problem by providing developers with a platform on which to establish the feasibility of a proposed design. However, commercial developers seem reluctant to employ this type of modelling in their design activity. This paper describes a modelling tool in which the traditional model generation technique of writing "programming language like" code is replaced with a model generation tool which uses a graphical representation of models whilst retaining sufficient formality to permit the models to be executed, or converted into code for analysis by a traditional model checking tool.

关键词： software systems Application software software engineering Computer science Costs Writing Hardware Assembly Programming software development management

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Inconsistency tolerance across enterprise solutions

Inconsistency tolerance across enterprise solutions

引用

IEEE Workshop on Future Trends of Distributed Computing systems

作者： P. Henderson R.J. Walters S. Crouch Declarative Systems and Software Engineering Group Department of Electronics and Computer Science University of Southampton Southampton UK

As every information system becomes connected to every other information system, they form the so-called "information utility". This is the domain in which contemporary distributed systems have to operate. New applications have to be evolved on this platform of existing systems that may hold inconsistent information. Consequently, solutions need to be able work in a world of only partially correct information. In this paper, we discuss means whereby architects, designers and engineers may, in this context of information inconsistency, develop new business solutions and reason about their validity. In particular we describe the properties of inter-enterprise system architectures for applications working with partially replicated and partially consistent information. These must be able to operate under reversible assumptions and to undo operations as a consequence of reversing assumptions. We have developed exemplary architectures that exhibit these properties, used them to investigate the concept of inconsistency-tolerant components and begun to devise methods of building inter-enterprise applications from such components. This approach, we conjecture, makes reasoning about the validity of proposed inter-enterprise scale solutions more straightforward and thus increases the speed with which new solutions can be deployed. We are evaluating these ideas now, by building, along with our industrial collaborators, realistic enterprise-scale demonstrations in the domains of Finance and Defence.

关键词： Distributed computing Internet software engineering Computer science Information systems Design engineering Identity-based encryption Read only memory Computer industry Finance

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