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Online QoS Adaptation with the flexible time-triggered (FTT) communication para...

Almeida, Luís; Pedreiras, Paulo; Ferreira, Joaquim; Calha, Mário; Fonseca, José Alberto; Marau, Ricardo; Silva, Valter; Martins, Ernesto


Assessment of FTT-CAN master replication mechanisms for safety-critical applica...

Marau, Ricardo; Silva, Valter; Ferreira, Joaquim; Almeida, Luís; Fonseca, José

Operational flexibility of distributed embedded systems is receiving a growing attention as it is required to support on-line adaptation to varying operational conditions, either due to changes in the environment or to faults in the system. However, flexibility makes dependability more difficult to achieve as there is less a priori knowledge. One protocol that favors flexibility and is widely used in embedded s...


Kernel design for FTT-CAN systems

Calha, Mário; Fonseca, José; Silva, Valter; Marau, Ricardo

In the context of a centralized holistic scheduling of tasks and messages, the complexity of the involved kernels is of utmost importance. Its complexity influences directly the overhead at the computing nodes. In this paper, an architecture of a kernel is presented. This kernel can be integrated in the computing nodes of a distributed control system without introducing a significant overhead. A central node di...


Implementing a distributed sensing and actuation system: the CAMBADA robots cas...

Silva, Valter; Marau, Ricardo; Almeida, Luís; Ferreira, Joaquim; Calha, Mário; Pedreiras, Paulo; Fonseca, José


Sistema de visão para robots móveis: o caso do robot CharrUA

Santos, Alexandre; Leite, Pedro; Marau, Ricardo; Sargento, Ana; Azevedo, José Luís; Cunha, Bernardo; Fonseca, Pedro; Almeida, Luís

In this paper we describe a robot that has been developed to participate in the Portuguese Robotics National Contest - ROBÓTICA 2003 – Festival Nacional de Robótica, with a particular emphasis on the vision system. This work stands out as the current top evolutionary phase of a continuous effort in the area of mobile robotics that has been carried out by the DET since 1996, with the permanent involvement of bot...


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