Massive content distribution on overlay networks stresses both the server and the network resources because of the large volumes of data, relatively high bandwidth requirement, and many concurrent clients. While the server limitation can be circumvented by replicating the data at more nodes, the network limitation is far less easy to cope with, due to the difficulty in determining the cause and...

A major challenge for organizations and application service providers (ASP) is to provide high quality network services to geographically dispersed consumers at a reasonable cost. Such providers employ content delivery networks (CDNs) and overlay networks to bring content and applications closer to their service consumers with better quality. Overlay networks architecture should support high-pe...

Content distribution networks (CDNs) have started to adopt hybrid designs, which employ both dedicated edge servers and resources contributed by clients. Hybrid designs combine many of the advantages of infrastructurebased and peer-to-peer systems, but they also present new challenges. This paper identifies reliable client accounting as one such challenge. Operators of hybrid CDNs are accountab...

To transmit and display high quality movies via optical networks, a new Super High Definition (SHD) digital cinema distribution system with the resolution of 8-million pixel is developed. Its image quality is four times of HDTV in resolution, and enables us to replace conventional 35mm films. This system is based on JPEG 2000 coding technology and transmits high quality digital cinema over high...

Content distribution on the Web is moving from an architecture where objects are placed on a single, designated server to an architecture where objects are replicated on geographically distributed servers and clients transparently access a nearby copy of an object. In this paper we study how the di erent redirection schemes used in modern content distribution networks a ect the user-perceived p...

Mobile devices pay the telecommunication cost of downloading Internet data proportional to the amount of data transferred. This paper introduces a special ad hoc network in which several mobile devices, called peers, to cooperate each other to reduce the overall cost to download Internet content. Each peer downloads a specific portion of the content over 3G connection and exchanges the portion ...

In this paper, we argue that cache consistency mechanisms designed for stand-alone proxies do not scale to the large number of proxies in a content distribution network and are not flexible enough to allow consistency guarantees to be tailored to object needs. To meet the twin challenges of scalability and flexibility, we introduce the notion of cooperative consistency along with a mechanism, c...

The presented research deals with (objective) video quality assessment and how it can be used within CDN. In order to guarantee a high perceived video quality an objective video content assessment and management service considering human visual system characteristics, audio-visual content and network impairments is being devised. Within this research aspects of automatic content assessment usin...

Caching and replication have emerged as the two primary techniques for reducing the delay experienced by end-users when downloading web pages. Even though these techniques may benefit from each other, previous research work tends to focus on either one of them separately. In particular, caching has been studied mostly in the context of proxy server systems, while replication is the technology b...

Current Content Distribution Networks (CDN) deployment requires heavy infrastructure investment since a large number of servers have to be deployed over a wide area. This paper proposes a new paradigm where future CDNs are to be deployed over a leased server and network infrastructure. While this paradigm shift introduces a new dimension of flexibility, it requires the resource provisioning and...