PhD student
Centre for Quantifiable Quality of Service in Communication Systems (Q2S)
Norwegian University of Science and Technology

I have been working as a PhD student at Q2S from August 2004 until February 2009. My thesis “Characterization and Modeling of Slice-based Video Traffic” was finished in February 2009 and defended on May 27th. During my PhD work I have published the following papers.

• Undheim, Astrid; Emstad, Peder Johannes. Distribution of Loss Volume and Estimation of Loss for Aggregated Video Traffic. To appear In Proceedings of the 21st International Teletraffic Congress (ITC 21). Paris, France, Sep, 2009.

• Undheim, Astrid; Emstad, Peder Johannes. Characterization of Slice-based H.264/AVC Encoded Video Traffic Using Token Buckets. Telecommunication Systems. Vol. 39, No. 2-3, Jun, 2008.

• Undheim, Astrid; Emstad, Peder Johannes. Distribution of Loss Periods for Aggregated Video Traffic. In Proceedings of the ITC Specialist Seminar 18. Karlskrona, Sweden, May, 2008.

• Undheim, Astrid; Jiang, Yuming; Emstad, Peder Johannes. Network Calculus Approach to Router Modeling with External Measurements. In Proceedings from International Conference on Communications and Networking in China (ChinaCom 2007). IEEE Conference Proceedings, 2007.

• Undheim, Astrid; Lin, Yuan; Emstad, Peder Johannes. Characterization of Slice-based H.264/AVC Encoded Video Traffic. In Proceedings of the 4th European Conference on Universal Multiservice Networks (ECUMN'2007). IEEE Computer Society, Toulouse, France, Feb, 2007.

• Undheim, Astrid; Øverby, Harald; Stol, Norvald. Absolute QoS in Synchronous Optical Packet Switched Networks. In Proceedings of Norsk Informatikkonferanse (NIK 2004). Tapir Akademisk Forlag, Stavanger, Norway, Nov, 2004

• Markovich, Natalia; Undheim, Astrid; Emstad, Peder Johannes. Classification of Slice-based VBR Video Traffic and Estimation of Link Loss by Exceedance. To appear in Computer Networks. Vol. 53, No. 7, Elsevier, May, 2009.

• Voldhaug, Jan Erik; Hellerud, Erik; Undheim, Astrid; Austreim, Erling; Svensson, Ulf Peter; Emstad, Peder Johannes. Influence of Sender Parameters and Network Architecture on Perceived Audio Quality. Acta Acustica united with Acustica. Vol. 94, No. 1, Hirzel Verlag, Feb, 2008.

• Markovich, Natalia; Undheim, Astrid; Emstad, Peder Johannes. Slice-based VBR Video Traffic Estimation of Link Loss by Exceedance. In Proceedings of the 4th International Telecommunication Networking Workshop on QoS in Multiservice IP Networks (QoS-IP 2008). Feb, 2008.

• Voldhaug, Jan Erik; Hellerud, Erik; Undheim, Astrid; Austreim, Erling; Svensson, Ulf Peter; Emstad, Peder Johannes. Effects of Network Architecture on Perceived Audio Quality. In Proceedings of the 2nd ISCA Tutorial & Research Workshop on Perceptual Quality of Systems. Berlin, Germany, Sep, 2006.

• Undheim, Astrid; Emstad, Peder Johannes. Characterization of Slice-based H.264/AVC using Token Buckets. In Proceedings of 4th EuroNGI Workshop on New Trends in Modelling, Quantitative Methods and Measurements. Ghent, Belgium, May, 2007.

• Undheim, Astrid; Emstad, Peder Johannes. Network Calculus Approach to Router Modeling with External Measurements. In Proceedings of 3rd EuroNGI Workshop on New Trends in Modelling, Quantitative Methods and Measurements. Torino, Italy, June, 2006.