On June 19th, 2018, Prof. Roger Zimmermann from the National University of Singapore visited the College of Computer Science and Technology upon invitation, and delivered a talk on the recent developments in DASH video streaming. The event was hosted by Prof. Wei Chen, Vice Dean of the College of Computer Science and Technology. Faculty and students from the college, together with students from the Zhejiang University of Technology attended the event.

To begin with, Prof. Zimmermann discussed the problem induced by traditional HAS technology, such as unbalanced allocation of network bandwidth and underutilization of network resources. He explained that these technical issues can cause instability in video streaming, leading to a decrease in the quality of end-user experience (QoE). To solve this technical issue, Prof. Zimmermann's team developed a dynamic video streaming system based on software-defined networking (SDN). This system can not only achieves maximum end-user experience given the bandwidth, but also has high flexibility due to its implementation of software applications and the Hypertext Transfer Protocol (HTTP). Moreover, Prof. Zimmermann further introduced another game-theory based video streaming technology developed by his team. The technology utilizes cooperative multi-terminal video streaming system, and introduced quantitative metrics of end user experience. Its primary goal is to achieve Nash equilibrium that optimizes user experience.

Prof. Wei Chen, Vice Dean of the College of Computer Science and Technology of Zhejiang University, gave a summary speech after the Prof. Zimmermann’s talk. He encouraged students to actively exchange ideas with Prof. Zimmermann to broaden their horizon. He mentioned that our college would also seek to cement long-term cooperation with Prof. Zimmermann and the School of Computing at the National University of Singapore in the future.

Biography

Dr. Roger Zimmermann is an associate professor in the School of Computing at the National University of Singapore. He is also the deputy director of the Smart System Institute at the National University of Singapore. He has co-authored seven patents and more than two-hundred peer-reviewed articles. He is a Senior Member of the Institute of Electrical and Electronics Engineers (IEEE) and a Distinguished Member of the Association for Computing Machinery (ACM).