Gastvortrag von Prof. Wolfinger am 17.06.10 um 17:15
Es spricht: Prof. Bernd Wolfinger Universität Hamburg
Termin: Donnerstag, den 17.06.10 um 17:15 Ort: Raum MI Hörsaal 2 (MI-Gebäude, Campus Garching) Thema: Performance Engineering and Traffic Engineering for Multimedia Applications in the Internet and in Mobile Networks
Abstract: Performance Engineering of computer and communication networks, among others, comprises practices, methods and tools which can be applied in order to design, implement and operate networks and their applications in such a way that given performance and Quality-of-Service (QoS) requirements are fulfilled. Traffic Engineering for networks in its broader sense comprises formal specification, measurement, modelling, characterization and manipulation (routing, traffic shaping, etc) as well as the generating of traffic loads in networks. Performance engineering and traffic engineering are particularly relevant in the context of the Internet and of mobile networks, more so, if those networks are used for real-time communications. The talk summarizes the long-term experiences in traffic and performance engineering within the Telecommunications and Computer Networks Division at Hamburg University. In particular, emphasis will be given to our recent research results related to measurement-based load characterization of audio and video streams, to formal load specification and analytical modelling of load transformations (stochastic load transformations as they are currently studied within the DFG project LUPUS) as well as to the elaboration of two powerful performance and traffic engineering tools: a distributed load generator for multimedia traffic in service-integrated networks and a network emulator to reflect the packet delay and loss behaviour of, possibly interconnected, computer and communication networks. A case study will be presented to illustrate the broad applicability of our load generator (UniLoG) and network emulator (NetEmu) prototypes. These experiments will also show that valid QoS-related studies for distributed real-time applications can be flexibly supported by a combined usage of both, the network emulator and the load generator tool. With our approach the strict separation between network-oriented and application-oriented performance studies is no longer required an important step towards a realistic QoS evaluation from an end-users point of view. Bio: Prof. Dr. Bernd E. Wolfinger has been with the Computer Science Department of Hamburg University since 1981, where he is presently heading the Telecommunications and Computer Networks (TKRN) Subdivision. Dr. Wolfinger has obtained degrees from Université Claude-Bernard, Lyon/F. (Maîtrise, 74), University of Karlsruhe/D (Diploma, Mathematics 75; Ph.D., Comp. Sc. 79). He has spent long-term sabbaticals at IBM Research / Yorktown, N.Y. (85), Internat. Computer Science Institute / Berkeley, Ca. (91,96), as well as at Université P. et M. Curie, LIP 6, Paris (01, 06). Professor Wolfinger is active in Networking research since 1975, has been responsible for numerous conference organizations and has served on a large variety of TPCs. He has been editor of books and special issues of journals; he has published more than 100 papers in areas such as High-speed & Wireless Networks and Real-time (audio/video) Communications as well as in Modeling (Simulation & Queueing Networks) , Measurement, Traffic Engineering, Performance & Reliability Evaluation, QoS Management and eLearning.
Prof. Georg Carle
phone: 089/ 289-18032