the proceedings contain 27 papers. the special focus in this conference is on distributed applications and interoperable systems. the topics include: Towards a framework for self-adaptive component-based applications;...
ISBN:
(纸本)3540205292
the proceedings contain 27 papers. the special focus in this conference is on distributed applications and interoperable systems. the topics include: Towards a framework for self-adaptive component-based applications;a scheme for the introduction of 3rd party, application-specific adaptation features in mobile service provision;towards a composition framework for non-orthogonal non-functional properties;meta-programming middleware for distributedobject computing;middleware support for resource-constrained software deployment;rational server selection for mobile agents;facilitating the portability of user applications in grid environments;negotiation as a generic component coordination primitive;a flexible framework for making components transactional;a security architectural approach for risk assessment using multi-agent systems engineering;middleware support for non-repudiable transactional information sharing between enterprises;adaptable access control policies for medical information systems;a flexible mechanism for optimized component attribute caching;a variable cache consistency protocol for mobile systems using time locks;building applications which make progress in an inconsistent world;hand-over video cache policy for mobile users;planning for network-aware paths;integrating the unreliable multicast Inter-ORB protocol in mjaco;a system of relay and translation gateways for communication among heterogeneous agents in ad hoc wireless environments;scalable location management for context-aware systems and a context ontology language to enable contextual interoperability.
Concurrent and distributedsystems have traditionally been modelled using nondeterministic transitions over configurations. the nondeterminism provides an abstraction over scheduling, network delays, failures and rand...
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ISBN:
(纸本)3540204911
Concurrent and distributedsystems have traditionally been modelled using nondeterministic transitions over configurations. the nondeterminism provides an abstraction over scheduling, network delays, failures and randomization. However a probabilistic model can capture these sources of nondeterminism more precisely and enable statistical analysis, simulations and reasoning. We have developed a general semantic framework for probabilistic systems using probabilistic rewriting. Our framework also allows nondeterminism in the system. In this paper, we briefly describe the framework and its application to concurrent objectbasedsystems such as actors. We also identify a sufficiently expressive fragment of the general framework and describe its implementation. the concepts are illustrated by a simple client-server example.
the main purpose of our work is the typing of concurrent, distributed and mobile programs based on the actor programming model, that is non-uniform behaviour concurrent objects communicating by asynchronous message pa...
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ISBN:
(纸本)3540204911
the main purpose of our work is the typing of concurrent, distributed and mobile programs based on the actor programming model, that is non-uniform behaviour concurrent objects communicating by asynchronous message passing. One of the key difficulties is to give a precise definition of "message not understood" errors in this context. In this paper, we investigate temporal logic and model-checking based technologies for an asynchronous message passing process calculi. We focus on non uniform input interfaces for processes, and then define a temporal logic tailored to their description and analyses. this logic deals with infinite-state systems, as mailboxes of actors are unbounded multisets of messages, but yet happens to be decidable. We use our logic to specify possible communication errors in actor-based programs in order to give precise and sound definition of type disciplines.
distributedsystems for open environments, like the Internet, are becoming more frequent and important. However, it is difficult to assure that such systems have the required functional properties. In this paper we us...
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this work aims to extend the algebraical approach to graph transformation to model object-oriented systems structures and computations. A graph grammar basedformal framework for object-oriented system modeling is pre...
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We introduce the notion of context-based addressing, i.e. the ability to refer to and send messages to a collection of agents based on their current context, without knowing the precise identities of the agents. We de...
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this paper presents our experience in implementing OMG Unreliable Multicast Inter-ORB Protocol specifications into an ORB. An integration model is proposed to allow the coexistence of two different protocol stacks (II...
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this paper outlines a sound and complete Hoare logic for a sequential object-oriented language with inheritance and subtyping like Java. It describes a weakest precondition calculus for assignments and object-creation...
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Nowadays, applications must work in highly dynamic environments, where resources availability, among other factors, can evolve at runtime. To deal withthis situation, applications must be self-adaptive, that is adapt...
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Performance analysis of computing systems, in particular distributed computing systems, is a complex process. Analysing the complex flows and interactions between a set of distributed processing nodes is a non-trivial...
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