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Controller area network (CAN) is nowadays widespread in distributed embedded systems due to its electrical robustness, low price, and deterministic access delay. However, its use in safety-critical applications has been controversial due to dependability limitations. In particular, in a CAN bus there are multiple components such that a single fault of any(More)
Network protocol designers have always been divided between the adoption of centralized or distributed communication architectures. Despite exhibiting negative aspects like the existence of a single point-of-failure in the master as well as computational overhead and an inefficient handling of the asynchronous communications, Master-Slave protocols have(More)
BACKGROUND The yellow fever vaccine is regarded as one of the safest attenuated virus vaccines, with few side-effects or adverse events. We report the occurrence of two fatal cases of haemorrhagic fever associated with yellow fever 17DD substrain vaccine in Brazil. METHODS We obtained epidemiological, serological, virological, pathological,(More)
Controller Area Network is normally used in event-triggered communication systems. These are known for not supporting composability with respect to the system temporal behavior. When using a time-triggered communication paradigm, such composability is achieved. However, common time-triggered systems rely on static message scheduling which compromises system(More)
In this paper we present the implementation and expert evaluation of a speech centric multimodal demonstrator that has been developed in the EURESCOM 1 MUST project (MUltimodal, multilingual information Services for small mobile Terminals). The demonstrator is a tourist guide for Paris. The paper fo-cuses on the technical implementation and interface design(More)
— In this paper we overview the integration of a framework that generically manages the system resources in the form of contracts, namely the FRESCOR framework, with a flexible network resource. We describe how a network resource, namely FTT-SE, supports the FRESCOR framework services and, likewise, how the network services are made available to the(More)
The use of distributed computing architectures has become commonplace in complex embedded systems with potential advantages, for example, in terms of scalability, dependability and maintainability. One particular area in which that trend can be witnessed is mobile autonomous robotics in which several sensors and actuators are interconnected by means of a(More)
Mobile robot competitions are events well suited to experimentation, research and development in many areas concerned with science and technology, ranging from material science to artificial intelligence. Aware of this fact, and for several years now, some Portuguese Universities have been involving some of their Engineering and Computer Science students in(More)
The FIP fieldbus (Factory Instrumentation Protocol, presently known as WorldFIP) uses, normally, an off-line scheduler that generates a cyclic static table containing the allocation of bus-time slots to the transaction of process control variables. Such table is organized in time-windows, called elementary cycles, within which the transactions are placed by(More)
Modern embedded control systems are asked to exhibit higher distribution, higher degree of integration and to support operational flexibility. Conventionally the planning of distributed control systems was done either by considering worst-case requirements, leading to expensive and inefficient designs, or by considering average requirements, potentially(More)