NDLI: QoS-oriented content delivery in e-learning systems

Content Provider	IEEE Xplore Digital Library
Author	Shihong Xu Hong Shen
Copyright Year	2009
Description	Author affiliation: School of Computer Science, The University of Adelaide, SA 5005, Australia (Shihong Xu; Hong Shen)
Abstract	QoS-oriented content delivery is an important component in en-learning systems. In this paper, we study the object placement problem in the parallel-access context for QoS-oriented content delivery. The problem is formulated in terms of bandwidth maximization and further proved to be equivalent to the Fault Tolerant Facility Location Problem (FTFL). In this problem the bandwidth that violates the triangle inequality is measured by a cost function which forms a metric when the shortest-path routing is deployed. Though there have been efficient UFL algorithms with good performance guarantees, the challenge of the FTFL Problem arises due to the conflict of its connectivity requirement (multiple distinct connections) and cost minimization (which leads to identical connections with the minimum cost). We investigate possible solutions for addressing this conflict after giving an overview of the existing techniques. Extension of the problem to the context of QoE-aware multimedia delivery which has important applications in e-learning systems is also discussed.
Starting Page	665
Ending Page	670
File Size	113468
Page Count	6
File Format	PDF
ISBN	9781424439287
DOI	10.1109/ITIME.2009.5236337
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-08-14
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Greedy algorithms Network servers Fault tolerance Electronic learning Bandwidth Routing Cost function Web server Distributed algorithms Delay
Content Type	Text
Resource Type	Article

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