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SOFIENE JELASSI

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Objective

After getting a considerable expertise during my doctoral study, I’m actually seeking to start my career as a professional researcher. I was working on various issues related to the integration of multimedia services over wireless networks, as will be described in further details subsequently. I’m keen on creating, defining, and setting-up new original and practical ideas. I undoubtedly believe that my formation give me adequate and sufficient preparation to be an effective researcher.

Education

September 2006 - till now: Doctoral student in computer science.

  • Thesis Title: Adaptive Quality Control of Packetized Voice Conversations over Mobile Ad-Hoc Network.
  • Thesis supervisors:
    • Habib YOUSSEF, Professor and Director, Higher Institute of Computer Science and Communication Technologies, Hammam Sousse, Tunisia.
    • Guy PUJOLLE, Professor, Computer Science Laboratory of Paris 6 (LIP6), University of Pierre and Marie Curie, France.
  • Expected graduation date: December 2009.

December 2005: Master of Science degree in Computer Science from the Faculty of Sciences, University of Monastir, Tunisia.

June 2003: Bachelor of Science degree in Computer Science from the Faculty of Sciences, University of Monastir, Tunisia.

Research interests

My research work explores various issues related to the successful integration of packet-based delay-sensitive services such as VoIP, radio station over IP, video conferencing, and audio/video streaming over heterogeneous and emergency mobile networks. For the sake of achievement of large-scale seamless network service convergence, important challenges should be thoroughly addressed and resolved, especially, over highly complex Next-Generation Networks (NGN). Particularly, the provision of a satisfactory Perceived Quality of Service (PQoS) for customers over a MANET is quite complicated given the features of such a network.

Research statement

Basically, my research work aimed at improving the PQoS of VoIP over MANET through the well-engineering of adaptive application-layer control mechanisms. In such a case, the receiver can remove network delay jitter using a de-jittering buffer, which should be smartly managed according to the features of MANETs. Moreover, it may reduce the PQoS degradation caused by missing media packets using a suitable Packet Loss Concealment (PLC) algorithm. On the other hand, the sender may adapt its data rate, protection strategy, and framing technique according to the time-varying available bandwidth and packet loss process. Such application control mechanisms should help providing seamless mobility and service ubiquity. Further, it is highly desirable to evaluate the performance of new proposals to improve PQoS of VoIPoW service at perceptual level, which impels the design of novel assessment methodologies dedicated to wireless systems.

Publications

Book Chapter

  1. S. Jelassi, H. Youssef, and G. Pujolle, “Perceptual Quality Assessment of Packet-Based Voice Conversations over Wireless Networks: Methodologies and Applications”, Quality of Service Architectures for Wireless Networks: Performance Metrics and Management, Global editors: S. Adibi and R. Jain, IGI Global Publisher, Accepted for publication, 2009.

Journals & Magazines

  1. S. Jelassi, H. Youssef, H. Melvin, and G. Pujolle, "Single-Ended Speech Quality Assessment Algorithms of VoIP Service", submitted for publication in the IEEE Network.
  2. S. Jelassi, H. Youssef, C. Hoene, and G. Pujolle, "Single-Ended Parametric Voicing-Aware Models for Live Assessment of Packetized VoIP Conversations", submitted for publication in Telecommunication Systems Journal, Springer-Verlag.
  3. S. Jelassi and H. Youssef, “Adaptive Play-out Scheduling Algorithm Tailored for Real-Time Packet-Based Voice Conversations over Wireless Ad-Hoc Networks”, Elsevier Computer Networks, Volume 52 Issue 13, Special Issue on: Research and Trials for Reliable VoIP Applications, pp. 2473-2488, September 2008.

International conferences

  1. S. Jelassi, H. Youssef, L. Sun, and G. Pujolle, “NIDA: A Parametric Vocal Quality Assessment Algorithm over Transient Connections”, in the Proceedings of 12th IFIP/IEEE International Conference on Management of Multimedia and Mobile Networks and Services (MMNS 2009), Venice, Italy, 26-30, October 2009.
  2. S. Jelassi, H. Youssef, and G. Pujolle, “'Parametric Speech Quality Models for Measuring the Perceptual Effect of Network Delay Jitter”, in the Proceedings of 34th Annual IEEE Conference on Local Computer Networks (LCN 2009), Zürich, Switzerland, 20-23, October 2009.
  3. S. Jelassi, H. Youssef, C. Hoene, and G. Pujolle, “Voicing-Aware Parametric Speech Quality Models over VoIP networks”, in the Proceedings of 2nd IEEE Global Information Infrastructure Symposium (GIIS 2009), Hammamet, Tunisia, June 23-26, 2009.
  4. S. Jelassi, H. Youssef, and H. Melvin, “A Self-tuned Quality-Aware De-jittering Buffer Scheme of Packetized Voice Conversations”, in the Proceedings of 8th Measurement of Speech, Audio and Video Transmission Quality in Networks (MESAQIN 2009), Prague, Czech Republic, June 11-12, 2009.
  5. S. Jelassi and H. Youssef, “Connectivity Aware Instrumental Approach for Measuring Vocal Transmission Quality over a Wireless Ad hoc Network”, in the Proceedings of the 2nd International IEEE/IFIP Conference on New Technologies, Mobility and Security (NTMS 2008), Tangier, Morocco, November 05-07, 2008.
  6. S. Jelassi and H. Youssef, “Contrôle Réactif de la Qualité Lors du Transfert Interactif de la Voix sur un Réseau IP”, dans les archives du 8ème Colloque Francophone de Gestion de RÉseaux et de Services (GRES 2007), Hammamet, Tunisie, Novembre 06-09, 2007.
  7. S. Jelassi and H. Youssef, “EVOM: A Software Based Platform for Voice Transmission and Quality Assessment over Wireless Ad-Hoc Networks”, in the Proceedings of 10th IEEE/ACM Annual International Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2007), Chania, Crete Island, Greece, October 22-26, 2007.
  8. S. Jelassi and H. Youssef, “Mobility Aware Play-out Algorithm for Interactive Audio Streaming over Wireless Ad-Hoc Networks”, in the Proceedings of the 4th IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS 2007), Pisa, Italy, October 8-11, 2007 (POSTER).
  9. S. Jelassi and H. Youssef, “Adaptive Playback Algorithm for Interactive Audio Streaming over Wireless Ad-hoc Networks”, in the Proceedings of the 2th ACM International Wireless Communications and Mobile Computing (IWCMC 2006), pp.219 – 225, Vancouver, British Columbia, Canada, July 03-06, 2006.

References

  • Pr. Habib YOUSSEF
    • Research Unit PRINCE, Higher Institute of Computer Science and Communication Technologies, Hammam Sousse, Tunisia
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  • Pr. Guy PUJOLLE
    • Computer Science Laboratory of Paris 6 University of Pierre et Marrie Curie Paris, France
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  • Pr. Bechir AYEB
    • Faculty of Sciences of Monastir Monastir, Tunisia
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  • Dr. Christian HOENE
    • Universität Tübingen, Tübingen, Germany
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Professional experience

  • Sept. 2007 till now: Teaching Assistant at the Higher Institute of Computer Science and Communication Technologies, Hammam Sousse, Tunisia.
    • Training course for undergraduate students to encourage learning autonomy through an on-line learning platform developed and maintained by the Virtual University of Tunis. The course introduces fundamental aspects of computer science.
  • Sep. 2004 - Sep. 2007: High school teacher (on permanent full-time basis), Monastir, Tunisia.
    • Teaching courses (20 Hours / Week): Computer science introduction, Static web development, Basic notions of Multimedia, and Introduction course of algorithmic and programming.
  • Nov. 2003 – Dec. 2003: Software developer, Computer Department of the Ministry of Finance, Tunis, Tunisia.
    • Design and development of a distributed application covering the national area of Tunisia using a national network connecting local agencies located in each town.

Skills

  • Programming languages
    • Experience in C, C++, JAVA, SQL, PL\SQL, PHP, PERL, TCL/TK
  • Research tool
    • Experience with Network Simulator 2
  • Operating Systems
    • Good knowledge of Linux and Windows
  • Database Management Systems
    • Good knowledge of Oracle and MySql

Languages

  • Arabic: Mother tongue
  • French: Fluently
  • English: Fluently
Mis à jour : Mardi, 22 Septembre 2009