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An experimental study of the Skype peer-to-peer VoIP system



Despite its popularity, relatively little is known about the traffic characteristics of the Skype VoIP system and how they differ from other P2P systems. We describe an experimental study of Skype VoIP traffic conducted over a five month period, where over 82 million datapoints were collected regarding the population of online clients, the number of supernodes, and their traffic characteristics. This data was collected from September 1, 2005 to January 14, 2006. Experiments on this data were...
S Guha, N Daswani, R Jain

Audio and Video Podcasts of Lectures for Campus-Based Students: Production and Evaluation of Student Use


Innovations in Education and Teaching International, Vol. 44, No. 4. (0 November 2007), pp. 387-399

Podcasting has become a popular medium for accessing and assimilating information and podcasts are increasingly being used to deliver audio recordings of lectures to campus-based students. This paper describes a simple, cost-effective and file size-efficient method for producing video podcasts combining lecture slides and audio without a requirement for any specialist software. The results from a pilot scheme delivering supplementary lecture materials as audio and video podcasts are also presented, including data on download patterns and responses to a survey of students on podcast use. These results reveal students' enthusiasm for podcast recordings of lecture materials and their primary use by students in revision and preparation for assessments. Survey responses also suggest little likely impact on lecture attendance as a consequence of podcasting, but indicate that podcast recordings of lectures may not be effective in facilitating mobile learning. (Contains 3 tables and 5 figures.)
Jonathan Copley