ACM Multimedia at Columbia
Oct 16, 2004
ACM Multimedia, a premier annual multimedia conference, covering all aspects of multimedia computing: from underying technologies to applications, theory to practice, and servers to networks to devices, was successfully held at Columbia. Prof. Schulzrinne was the general program chair for ACM MM 2004.
Jonathan Lennox Defends his PhD Thesis
Dec 05, 2003
Dr. Jonathan Lennox successfully defended his PhD thesis titled Services for Internet Telephony. He is going to continue in our lab as Post Doc.
Off-broadway Musical - STOMP
Nov 12, 2003
We bought discounted tickets for off-broadway sensation STOMP. STOMP is an explosive, provocative, sophisticated, utterly unique and appeals to audiences of all ages. The international percussion sensation has garnered an armful of award and rave reviews, and has appeared on numerous national television shows. The eight-member troupe uses everything but conventional percussion instruments, matchboxes, wooden poles, brooms, garbage cans, Zippo lighters, hubcaps to fill the stage with magnificent rhythms. As USA Today says, STOMP finds beautiful noises in the strangest places. STOMP. See what all the noise is about. The show is great and highly recommended! To take part, simply call the Box Office at 212-477-2477.
IRT Fall Social
Oct 19, 2003
We hiked for two hours up the Riverbank Park and crossed the GWD. Then we went to Henning's house in Leonia, New Jersey, for dinner. It was lots of fun! We started from 120th st. Columbia entrance. Then took the M11 bus to the Riverbank Park. Then walked north along the bank, towards the bridge. We saw a small red lighthouse under the bridge. The New York sky line view from the bridge was great. Afterwards, we had a nice dinner party at Henning's house.
Prof. Schulzrinne receives Mayor's Medal
Oct 08, 2003
Prof. Henning Schulzrinne received the Mayor's Award for Excellence in Science and Technology from New York City Mayor Michael Bloomberg on October 8, 2003. Professor Schulzrinne was nominated for the Mayor's Medal by Mark Wegleitner, Chief Technology Officer for Verizon, Inc., and Stuart Elby, Verizon's Vice President of Network Architecture and Enterprise Technology. The award ceremony took place in Brooklyn Botonic Garden.
This semester (fall 2004), We are meeting every week on Wednesday in the CS conference room, at 6:00 PM.
Firewalls and session border controller
By EILON YARDENI (15 Feb)
I will present an overview about the Verizon funded Statefull Border Gateways project. I will also talk about Firewalls and about the CloudShield packet-processing server which will be used in this project.
Airborne Traffic Surveillance System
By SUMAN SRINIVASAN (08 Feb)
Timely information about highway traffic conditions is very important for the Department of Transportation (DOT) and other relevant agencies. Such live information would be very important when traffic incidents or accidents occur. An aerial view is the best for traffic situations, particularly over highways. Unmanned aircraft equipped with monitoring video cameras and/or other sensors may be able to deliver the necessary information through video images with relatively low operational costs and risks to human life. ATSS (Airborne Traffic Surveillance System), a project funded by the Florida Department of Transportation, attempts to make this vision a reality. This presentation describes how the University of Florida research team implemented a system for ATSS from ground up, using unmanned aerial vehicles, digital video encoding, and transmission of data and multimedia video streams over FDOT's microwave IP networks.
Effect of Node Non-cooperation and Mobility on Mobile Infostation
By ANDY YUAN (01 Feb)
In a mobile infostation network, any two nodes communicate when they are in proximity. Under this transmission constraint, any pair of nodes is intermittently connected as mobility shuffles node locations. The capacity of mobile infostation networks is orders of magnitude higher than that of multihop networks, at the expense of a large random delay. In this talk I focus on the effect of node non-cooperation and node mobility on mobile infostation networks. First, I will address the issue of node noncooperation in the context of a movie downloading application. We assume all nodes have a common interest for all files and can download them from fixed infostations. Moreover, two nodes in proximity can negotitate for peer-to-peer a file exchange. Due to the non-cooperative nature, a file exchange occurs only if both nodes find a file they want from each other. We have also extended the model to the case where nodes have dissimilar interests. Our findings indicate that two diversity techniques can be exploited to improve throughput and fairness. Then I will address the impact of observer speed on its data rate in highway mobile infostation networks. A general highway mobility model is proposed, in which nodes move with a known but arbitrary speed distribution. Using arguments from renewal theory, the long run data rate of a node can be determined as a function of its mobility. A numerical study is provided for the case of uniform speed distribution. We find out data rate is independent of node speed in reverse traffic scenarios while it may increase with speed in forward traffic scenarios.
Emergency services in SIP
By ANSHUMAN RAWAT AND MATTHEW MINTZ-HABIB (18 Jan)
Abstract: We have developed a prototype of a system which provides for emergency services (911) in SIP based VOIP. In the talk today, we will be describing the architecture of this system followed by a demonstration of the system. We will be demonstrating how, for an emergency call, the location of the emergency caller is determined, the correct PSAP (public safety access point) for this caller (based on caller's location) determined and then routed to that PSAP. We also demonstrate the capabilities of a SIP enabled PSAP.