The macroscopic behavior of the TCP congestion avoidance algorithm
ACM SIGCOMM Computer Communication Review
Modeling TCP throughput: a simple model and its empirical validation
Proceedings of the ACM SIGCOMM '98 conference on Applications, technologies, architectures, and protocols for computer communication
Quality is in the eye of the beholder: meeting users' requirements for Internet quality of service
Proceedings of the SIGCHI conference on Human Factors in Computing Systems
The World Wide Wait: Where Does the Time Go?
EUROMICRO '98 Proceedings of the 24th Conference on EUROMICRO - Volume 2
Reusability of eLearning Objects in the context of Learning Grids
Proceedings of the 2005 conference on Towards the Learning Grid: Advances in Human Learning Services
Reusability of elearning objects in the context of learning grids
3LeGE-WG'03 Proceedings of the 3rd international LeGE-WG conference on GRID Infrastructure to Support Future Technology Enhanced Learning
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In the context of LeGE-WG we expect to see the Open Grid Services Architecture (OGSA) being used as a guiding framework for the future deployment of Distributed Learning Environment (DLEs). OGSA is totally service-oriented and it has been known for sometime that Quality of Service (QoS) is key to the success of DLEs. Delay in particular, as experienced by the end user, is one of the key QoS parameters for a DLE. This paper describes techniques for identifying sources of such delay, and a model for its analysis. Four major sources of delay are distinguished: Server, Client, Network and Protocol. The analysis techniques are illustrated in a case study of the traffic associated with a set of operational DLEs serving six Universities over a period of several months. This paper contributes towards the use of OGSA for e-learning by providing a detailed understanding of the QoS requirements for an OGSA compliant e-learning service.