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Evènements et manifestations

28/12/2016

Doctorate thesis defense of Imen Arfaoui




Doctorate thesis defense on December 28th 2016 at 09H00 AM ,in Amphi I, Sup’Com.


Entitled :Forms and Models of Irregularities in WSNs: Effects and

Presented by : Imen Arfaoui 





Committee


President

Pr. Sofiane Cherif

School of Communication Engineering of Tunis. SUP’Com

 

 

 

Examiners

Pr. Antoine Bagula

Western Cape University, South Africa

 

Dr. Essaid Sabir

National Higher School of Electricity and Mechanics. ENSEM

 

Member

Pr. Khalifa Trimeche

Faculty of Science of Tunis

 

Thesis Supervisor

Pr. Noureddine Boudriga

School of Communication Engineering of Tunis. SUP’Com

 

Abstract


Wireless sensor networks (WSNs) have become one of the most active research areas due to the bright and interesting future promised to the world. In such networks, most numerical experiments, models, and techniques have been developed using ideal conditions, while idealistic assumptions do not hold true in practical situations. In fact, these networks face many forms of changing variables such as radio frequency, atmospheric conditions, environmental changes and event occurrence irregularities to mention some of them. The contribution of the thesis is four-fold.


First, we proposed a novel irregular radio model for more realistic and controllable deployment of WSNs. For this, we studied the radio propagation effects such as the distance, the path loss, the presence of obstacles and the environmental conditions and we proposed an irregular radio model based on these effects.


Second, we provided deployment schemes taking into account the atmospheric, geographic and environmental conditions of WSN. In fact, the factors regarding the area under monitoring and the environment under which the deployment is performed may affect the deployment quality and reduce its efficiency


Third, we built techniques for coverage completeness in order to detect and manage holes with the presence of radio irregularity. For this, we discussed the concept of holes due to radio irregularity and develop a new method based on the determination of polygonal cycles in a graph. A hole detection method is proposed also when the deployment of sensors is done from air.


Fourth, we proposed a resilience method of WSN based surveillance system. Two solutions of WSN based surveillance system are proposed, namely, thick and muli-thick line(s) WSN architecture. The resilience method aims to deploy a minimum number of sensors, in area of interest, while maximizing the network lifetime taking into account the irregular crossings.


Keywords


Wireless Sensor network, forms, radio frequency, atmospheric conditions, environmental changes, event occurrence, deployment, coverage, connectivity, surveillance systems, network lifetime.