Carey L. Williamson

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The phenomenal growth in popularity of the World Wide Web (WWW, or the Web) has made WWW traffic the largest contributor to packet and byte traffic on the NSFNET backbone. This growth has triggered recent research aimed at reducing the volume of network traffic produced by Web clients and servers, by using caching, and reducing the latency for WWW users, by(More)
Abslrucf-This paper presents a workload characterization study for Internet Web servers. Six diRerent data sets are used in the study: three From academic environments, two from scientific research organizations, and one from a commercial Internet provider. These data sets represent three different orders of magnitude in server activity, and two different(More)
Thii paper describes a new protocol to support IP multicast for mobile hosts in an IP internetwork. It uses the basic unicast routing capability of IETF Mobile IP as a foundation, and leverages existing IP multicast to provide multicast services for mobile hosts as well. We believe that the resulting scheme is simple, scalable, transparent, and to the(More)
This paper describes the design and use of a synthetic Web proxy workload generator called ProWGen to investigate the sensitivity of Web proxy cache replacement policies to five selected Web workload characteristics. Three representative cache replacement policies are considered in the simulation study: a recency-based policy called Least-Recently-Used(More)
This paper develops analytic models that characterize the behavior of on-demand stored media content delivery using BitTorrent-like protocols. The models capture the effects of different piece selection policies, including Rarest-First and two variants of In-Order. Our models provide insight into transient and steady-state system behavior, and help explain(More)
This article studies the "filter effects" that occur in Web proxy caching hierarchies due to the presence of multiple levels of caches. That is, the presence of one level of cache changes the structural characteristics of the workload presented to the next level of cache, since only the requests that miss in one cache are forwarded to the next(More)
70 NOVEMBER • DECEMBER 2001 http://computer.org/internet/ 1089-7801/01/$10.00 ©2001 IEEE IEEE INTERNET COMPUTING T he Internet’s evolution over the past 30 years has been accompanied by the development of various network applications. These applications range from early text-based utilities such as file transfer and remote login to the more recent advent of(More)
This paper uses trace-driven simulations to evaluate the performance of different cache management techniques for multi-level Web proxy caching hierarchies. In particular, the experiments consider heterogeneous cache replacement policies within a two-level caching hierarchy, and sizebased partitioning across the levels of a caching hierarchy. Three(More)
We introduce the concept of a Visual Backchannel as a novel way of following and exploring online conversations about large-scale events. Microblogging communities, such as Twitter, are increasingly used as digital backchannels for timely exchange of brief comments and impressions during political speeches, sport competitions, natural disasters, and other(More)
Traffic classification is the ability to identify and categorize network traffic by application type. In this paper, we consider the problem of traffic classification in the network core.Classification at the core is challenging because only partial information about the flows and their contributors is available. We address this problem by developing a(More)