Skander Azzaz

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Fault-tolerance is one of the main issues in Wireless Sensor Networks (WSNs) where applications require a continuous service. In this paper, we show how to use a small number of mobile robots to handle failures that may occur in the WSN. We study two strategies: Centralized Manager Strategy (CMS) and CMS with anticipation noted by CMS* to detect, report(More)
In this paper, we focus on applications with quantitative QoS (Quality of Service) requirements in their end-toend response time. Two types of quantitative QoS garantees can be delivered by a network: deterministic and probabilistic. The deterministic approach is based on a worst case analysis. The probabilistic approach uses a mathematical model to obtain(More)
In this paper, we have proposed two distributed preventive maintenance strategies dedicated for large-scale wireless sensor networks (WSNs) using a reduced number of mobile robots : (i) Fixed Distributed Preventive Maintenance Strategy denoted by F-DPMS, (ii) Adaptive Distributed Preventive Maintenance Strategy denoted by A-DPMS. F-DPMS and A-DPMS are(More)
In this paper, we focus on applications with quantitative QoS (Quality of Service) requirements in their end-to-end response time (or jitter). We propose a solution allowing the coexistence of two types of quantitative QoS guarantees, deterministic and probabilistic, while providing high resource utilization. Our solution combines the advantages of both the(More)
BACKGROUND In patients with acute ST-segment elevation myocardial infarction (STEMI) treated with primary percutaneous coronary intervention (pPCI), the recommended times (first medical contact-to-balloon (M2B) <120 or <90min, and door-to-balloon (D2B) <45min) are reached in less than 50% of patients. PURPOSE To compare the interventional reperfusion(More)
Generally, with a limited number of fixed priorities ( ) within a network, applications sharing a same priority are scheduled according to First in First out ( I O) discipline. This policy is called FP/FIFO. However real time applications have deadline requirements which aren’t taken into account with the I O discipline. That is why we propose to introduce(More)
BACKGROUND Massive intracoronary thrombus is associated with adverse procedural results including failed aspiration and unfavourable reperfusion. We aim to evaluate the effect of the intracoronary administration of antithrombotic agents via a perfusion catheter in patients with ST-segment elevation myocardial infarction (STEMI) presenting with a large(More)
Providing a continuous service is the main requirement for many application types deployed in Wireless Sensor Networks (WSNs). In this paper, we study two maintenance strategies using a small number of mobile maintainer robots to restore the WSN coverage and connectivity upon a sensor failure: the Centralized Maintenance Strategy (CMS) and the Centralized(More)