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Using SPIN and STeP to verify business processes specifications

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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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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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Comparison of some negotiation algorithms using a tournament-based approach

Comparison of some negotiation algorithms using a tournament...

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International Workshop on Agent Technologies for e-Services, ATES 2002, 3rd International Symposium on Multi-Agent systems, Large Complex systems, and E-Businesses, MALCEB 2002 and International Workshop on Agent Technology and software engineering, AgeS 2002 held in conjunction with International Conference on Net.ObjectDays, NODe 2002

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

ISBN: (纸本)9783540365594

This paper provides some results and analysis of several negotiation algorithms. We have used a tournament-based approach to evaluation and applied this within a community of Buyers and Sellers in a simulated car hire scenario. An automated negotiation environment has been developed and the various negotiation algorithms made to compete against each other. In a single tournament, each algorithm was used as both a Buyer-negotiator and a Sellernegotiator. Each negotiating algorithm accommodates the parameters for negotiation as a set of desirable goals, represented as examples of product specifications. It was the task of each negotiating algorithm to get the best deal possible from every one of their opposites (i.e. Buyer versus Seller) in the sense of being close to the examples they were given as goals. One algorithm proved to be superior to the others against which it was made to compete. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Sales

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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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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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Effects of introducing survival behaviours into automated negotiators

Effects of introducing survival behaviours into automated ne...

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IEEE Annual International Computer software and Applications Conference (COMPSAC)

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

With the rise of distributed e-commerce in recent years, demand for automated negotiation has increased. In turn, this has facilitated a demand for ever more complex algorithms to conduct these negotiations. As the complexity of these algorithms increases, our ability to reason about and predict their behaviour in an ever larger and more diverse negotiation environment decreases. In addition, with the proliferation of internet-based negotiation, any algorithm also has to contend with potential reliability issues in the underlying message-passing infrastructure. These factors can create problems for building these algorithms, which need to incorporate methods for survival as well as negotiation. This paper proposes a simple yet effective framework for integrating survivability into negotiators, so they are better able to withstand imperfections in their environment. Results of an experiment are provided which show how the stability of a negotiation community is affected by incorporating an example survival behaviour into negotiators operating in an environment developed to support this framework.

关键词： Stability software engineering Computer science Internet Electronic commerce software algorithms Computer applications Application software Uncertainty

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System design validation using formal models

System design validation using formal models

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International Workshop on Rapid System Prototyping (RSP)

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

Formal methods are a nice idea, but the size and complexity of real systems means that they are impractical. We propose that a reasonable alternative to attempting to specify and verify the system in its entirety is to build and evaluate an abstract model(s) of aspects of the system that are perceived as important. Using a model will not provide proof of the system, but it can help to find shortcomings and errors at an early stage. Executing the model should also give a measure of confidence in the final product. Many systems today are built from communicating components so that the task of the developers is becoming fitting these components together to form the required system. We show how a formal model can be sympathetic to this type of architecture using our tool, RolEnact and explain how this may be related to a COM implementation.

关键词： software engineering Computer science Costs Prototypes Ear Programming Safety Inspection User interfaces software tools

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Component-based systems as an aid to design validation

Component-based systems as an aid to design validation

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IEEE International Conference on Automated software engineering (ASE)

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

There is a continuing need for software engineers to design better-quality systems more quickly. Component-based technologies promise to make this possible, but modern systems are too complex for a full analysis of their behaviour to be practical. We propose that a reasonable alternative is to analyse abstract models of the essential features of a system. Since these models are abstract, they need contain only those details that are relevant to the aspect of the system under consideration. Consequently, they can be small enough to be constructed quickly and analysed thoroughly using formal methods. Tools are required which are accessible to the novice but which remain powerful enough to build models with a formal foundation so that they can be used by system designers who have limited expertise in the use of formal methods. We propose our tool, RolEnact, as a candidate for this role.

关键词： software engineering Computer science software tools Design engineering Power system modeling software quality Java Hardware

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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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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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