; Baptizado com o nome do amigo/inimigo inseparável do gato Tom, Jerry foi um dos robots que disputou a edição de 1999 do Concurso Microrato.Foi construído com base nas placas da Mekatronix MRC11 [1] (controlador) e MRSX01 [2] (I/O), e todo o restante material standard fornecido para o dito concurso, tais como suporte mecânico, motores e sensores. É um robot que i...
This paper presents an Ethernet sniffer based on dedicated hardware, able to carry out the timestamping of network events with a level of resolution and precision compatible with the specific needs of real-time protocols. The sniffer is basedin FPGA technology, and autonomously stores in local memory the received messages data and associatedinformation (timestamps and size). This data is then fed to the host co...
; No 1º semestre do ano lectivo 2003-2004 funcionou pela primeira vez a opção de 5º ano intitulada Sistemas de Tempo-Real, tanto no âmbito da LEET como da LECT. Embora algumas matérias relacionadas com essa temática já tenham vindo a ser abordadas noutras disciplinas, tal tem sido efectuado de forma avulsa, tendo sido esta a prim...
Transient communication faults in distributed control systems (DCS) are unavoidable but must be handled adequately in order to enforce correct system behaviour. A typical way of handling transient faults is temporal redundancy by means of retransmissions. However, DCS are frequently designed with time-triggered architectures, being scheduled offline and not coping efficiently with retransmissions as these requi...
Real-Time Ethernet (RTE) protocols have difficulties in attaining a bandwidth efficient support of aperiodic message streams in scenarios where strict timeliness requirements have to be met. To overcome such difficulties, the authors proposed recently the Server-SE protocol that deploys server-based traffic scheduling over switched Ethernet using the FTT-SE protocol and COTS switches as platform. This paper ext...
Cooperating mobile autonomous robots have been generating a growing interest in fields such as rescue, demining and security. These applications require a real time middleware and wireless communication protocol that can effecient and timely support the fusion of the distributed perception and the development of coordinated behaviors. This paper proposes an affordable middleware, based on low-cost and open-sour...
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