-- Wajdi Elleuch Web Site --

Wajdi Elleuch is an Assistant Professor at the National Engineering School of Sfax.

As engineer in computer networks and telecommunications from INSAT, I pursued my academic studies at Université de Sherbrooke (Québec - Canada) by a Master in Applied sceicnes (M.A.Sc) (2002-2004) and a Ph.D (2006-2011). from 2004 to 2006 I acted as Full time VoIP developer in M5T company (Sherbrooke –Québec- Canada).

My academic background and my research were firstly oriented to the field of computer and software engineering. Subsequently, I applied this expertise by coupling it to the computer networks field to focus my researches and my expertise on the multimdedia services over IP and specialy using SIP (Session Intitiation Protocol). These services mainly include VoIP, Video over IP, multiparty communication, instant messaging, presence service, etc. The remaining part of this report describes my activities in (1) computer engineering and software engineering and (2) the development of communication services over IP.

Activity in computer and software engineering

During my engineering studies, I involved on different projects in academic and industrial context.

During my Master project at the Université de Sherbrooke, I experimented new design environment using MVC model coupled with XML technology. This project involved the development of an application that assist teachers when composing their exams that include Multiple Choice Question (MCQ) as well as Textual Development based Question (TDQ). Students can then access their exams and remotely pass them over IP based network (Intranet or internet). Also, a new assessment method for exams rating was introduced to accelerate the evaluation of QDT through a GUI Java applet connected to the Tomcat web server via HTTP protocol. This project is based on the conceptual model MVC (Model - View - Controller) and allow different views of the same data source. Thus, it was possible for example to generate customized presentation in HTML or even in PDF. This was possible through XSLT and XSLT-Fo transformations.

This developed expertise have been spread to include object-oriented programming, relational databases design, XML-data design, Web server application deployment and development of network communications between applications via proprietary HTTP protocol

Activity in Developing communication services based on IP

After this experience in the field of Software Engineering, I have focused my expertise from 2004 to the development of communication services over IP. So I acted during two years as a research engineer on the development of IP telephony services on behalf of Mediatrix and M5T companies (that belong to the Media5 group) based in Sherbrooke (Quebec). Both companies are specialized in the development of the software components (secure SIP/SDP/RTP/RTCP stacks) as well as hardware components (manufacturing of IP telephony devices). This experience allowed me to gain valuable experience in programming within multitasking real-time services context for multimedia communications over IP networks. Meanwhile, I have also developed a global vision on the architectures and software/hardware interactions for the implementation of these services (Registar Server, Redirect Server, Presence Server, Proxy Server, etc.). However, this expertise was focused in the context of a multimedia communication between only two participants (not taking into account the multiusers mode).

Since 2006, and as part of my PhD work, I am interested in expanding multimedia communications between stakeholders to apply them to multiuser scenarios (multipoint communication). I explored several concepts and architectures to meet the needs of a multipoint videoconference (management and conference announcement, management of participants and their access rights, management of Quality of Service (QoS), video and audio qualities, Floor control for managing dialogue, securing communication, etc. ). So I experimented and used different models: from some basic models like "end-system mixing" or "conference-server mixing", to more complex models like the "fully meshed" one and towards the end of my PhD I introduced new model that enables support for large scale conferences using a P2P approach.

Since 2010, I had some collaborations with north americain compagnies and institutions. I'm acting as independant expert for projects related to providing and designing some innovative multimedia services based on SIP protocol. I'm also acting as reviewer for IEEE Communication Magazine as awell as some other journals as the International Journal of Network Protocols and Algorithms.

I also worked at the University of Sherbrooke as a lecturer to teach mainly object-oriented programming as well as networks and protocols courses for students graduating from the Faculty of Engineering (Computer Engineering) as well as the University of Sfax in Tunisia. I participated in the study and implementation of several projects in collaboration with the company M5T (Sherbrooke). These projects focused on (1) the introduction of videoconferencing when participants are interconnected via a fully meshed network, (2) the use of PDAs and thin clients to participate in videoconferences (application developed under Windows Mobile), (3) integration of presence information and multimedia conferences (4) the establishment of a videoconference with the exchange of medical data (electrocardiogram) between physicians and the ambulance transporting the patient.

In recent years, I published and presented several works in IEEE international conferences (WiMOB, CCNC, Canadian IEEE, etc). In 2008 I also filed a patent (accepted as US patent in januay 2012) in the field of videoconferencing with the option of session mobility during a multipoint communication to enable participants to seamlessly switch from one device to another one without interruption.