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Data gathering approach in dense sensor networks
Vahabi, Maryam; Tovar, EduardoSensor/actuator networks promised to extend automated monitoring and control into industrial processes. Avionic system is one of the prominent technologies that can highly gain from dense sensor/actuator deployments. An aircraft with smart sensing skin would fulfill the vision of affordability and environmental friendliness properties by reducing the fuel consumption. Achieving these properties is possible by p...
Response time analysis of slotted WiDom in noisy wireless channels
Vahabi, Maryam; Tennina, Stefano; Tovar, Eduardo; Andersson, BjörnWiDom is a wireless prioritized medium access control protocol which offers very large number of priority levels. Hence, it brings the potential to employ non-preemptive static-priority scheduling and schedulability analysis for a wireless channel assuming that the overhead of WiDom is modeled properly. Recent research has created a new version of WiDom (we call it: Slotted WiDom) which offers lower overhead co...
Networked embedded systems for active flow control in aircraft
Tovar, Eduardo; Pereira, Nuno; Bate, Iain; Indrusiak, Leandro; Penna, Sérgio; Negrão, José; Viana, Júlio C.; Philipp, François; Mayer, Dirk; Heras, JoséAerodynamic drag is known to be one of the factors contributing more to increased aircraft fuel consumption. The primary source of skin friction drag during flight is the boundary layer separation. This is the layer of air moving smoothly in the immediate vicinity of the aircraft. In this paper we discuss a cyber-physical system approach able of performing an efficient suppression of the turbulent flow by using...
CoS: a new perspective of operating systems design for the cyber-physical world
Gupta, Vikram; Tovar, Eduardo; Pereira, NunoOur day-to-day life is dependent on several embedded devices, and in the near future, many more objects will have computation and communication capabilities enabling an Internet of Things. Correspondingly, with an increase in the interaction of these devices around us, developing novel applications is set to become challenging with current software infrastructures. In this paper, we argue that a new paradigm fo...
Building a microscope for the data center
Pereira, Nuno; Tennina, Stefano; Tovar, EduardoManaging the physical and compute infrastructure of a large data center is an embodiment of a Cyber-Physical System (CPS). The physical parameters of the data center (such as power, temperature, pressure, humidity) are tightly coupled with computations, even more so in upcoming data centers, where the location of workloads can vary substantially due, for example, to workloads being moved in a cloud infrastructu...
Enhancing the real-time capabilities of the Linux Kernel
Sousa, Paulo Baltarejo; Pereira, Nuno; Tovar, EduardoThe mainline Linux Kernel is not designed forhard real-time systems; it only fits the requirements of soft realtimesystems. In recent years, a kernel developer communityhas been working on the PREEMPT-RT patch. This patch(that aims to get a fully preemptible kernel) adds some realtimecapabilities to the Linux kernel. However, in terms ofscheduling policies, the real-time scheduling class of Linux islimited to t...
The generalized multiprocessor periodic resource interface model for hierarchic...
Burmyakov, Artem; Bini, Enrico; Tovar, EduardoComposition is a practice of key importance in software engineering. When real-time applications are composed it is necessary that their timing properties (such as meeting the deadlines) are guaranteed. The composition is performed by establishing an interface between the application and the physical platform. Such an interface does typically contain information about the amount of computing capacity needed by ...
Redes de comunicação industriais do tipo Field Bus, integração em ambiente CIM
Tovar, Eduardo Manuel de Médicis,Dissertação apresentada para obtenção do grau de Mestre em Engenharia Electrotécnica e de Computadores, na Faculdade de Engenharia da Universidade do Porto, sob a orientação do Prof. Doutor Artur Agostinho Capelo Cardoso
Supporting real-time communications with standard factory-floor networks
Tovar, Eduardo Manuel de Médicis,Dissertação apresentada para obtenção do grau de doutor em Engenharia Electrotécnica e de Computadores, na Faculdade de Engenharia da Universidade do Porto sob a orientação do Prof. Dr. Francisco Vasques
On the implementation of real-time slotbased task-splitting scheduling algorith...
Sousa, Paulo Baltarejo; Bletsas, Konstantinos; Tovar, Eduardo; Andersson, BjörnIn this paper we discuss challenges and design principles of an implementation of slot-based tasksplitting algorithms into the Linux 2.6.34 version. We show that this kernel version is provided with the required features for implementing such scheduling algorithms. We show that the real behavior of the scheduling algorithm is very close to the theoretical. We run and discuss experiments on 4-core and 24-core ma...
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