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The introduction of the workflow management provided companies with a flexible and robust approach to the supervision and execution of the business process. A further question that must be addressed is to help companies in the reuse of already developed workflows, thus saving investments and reducing time-to-market. This paper proposes a methodology aiming at providing reuse and modularity for production...
The real-time specification for Java (RTSJ) introduces a new memory model featuring some programming constraints that impede the "as-is" use of many well known design patterns. In this context, this paper describes and evaluates two design patterns, developed by the authors for distributed real-time Java software, that are able to overcome the limitations imposed by RTSJ. The first pattern,...
The increasing complexity of productive systems associated with the geographical dispersion of industries motivates new demands and the adoption of new design tools. In this context the purpose of this work is to introduce a new platform for distributed modeling and analyses of productive systems. The platform is based on Petri net as a modeling formalism and on the label-ring protocol for managing...
The paper presents a layered architecture for real-time surveillance systems. Each layer includes objects that model the "real world" at a specific abstraction level, from raw data up to domain concepts. Each layer performs abstractions on perceptions coming from the lower layer and formulates timed hypotheses about domain objects. The failure of a hypothesis causes a perception to flow...
In the SIRENA project, the service oriented approach is used to connect devices using Web services or Universal Plug and Play (UPnP). In this environment, resources are scarce, and near real time behaviour and high reliability without user intervention is needed. At least in our context an interface design for service oriented architecture should not use a classical object oriented method decomposition...
The growing complexity of embedded applications has motivated system designers to search for methods and tools that enable the automatic generation of embedded systems. This paper outlines a strategy for generating customized run-time support systems and specific hardware platforms for dedicated applications. Based on the application-oriented system design methodology, the approached strategy proposes...
This paper describes formal modeling and verification of automation systems from the system engineering point of view. Reuse of model components is the key issue in order to bring the scientific modeling methodology into engineering practice. The reuse is achieved by the combination of modular modeling of automation systems with object-oriented description of models in UML style. This allows to benefit...
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