Over the past decade, content delivery networks (CDNs) have attracted substantial Internet traffic and improved quality of experience for Internet users. However, the evolution of the Internet ecosystem, which is driven by underlying economic incentives and ever emerging technologies, posts great challenges to the existing commercial CDNs (CCDNs). Thoroughly understanding the CDN industry from ...

Content Delivery Networks (CDN) aim at overcoming the inherent limitations of the Internet. The main concept at the basis of this technology is the delivery at edge points of the network, in proximity to the request areas, to improve the user’s perceived performance while limiting the costs. This paper focuses on the main research areas in the field of CDN, pointing out the motivations, and ana...

Internet evolves and operates largely without a central coordination, the lack of which was and is critically important to the rapid growth and evolution of Internet. However, the lack of management in turn makes it very difficult to guarantee proper performance and to deal systematically with performance problems. Meanwhile, the available network bandwidth and server capacity continue to be ov...

This article describes the experiences of the Care Delivery Network (CDN) Project, particularly as they relate to the diffusion of knowledge in healthcare settings. After outlining the history of the CDN Project, several propositions are tested and findings presented. The CDN’s experience suggests that for innovations to be voluntarily adopted by health service delivery organizations dispersed ...

The Contract Change Management (CCM) system is an on-line collaboration tool, which supports the contract change management process of NEC (New Engineering Contract) form of contract. It is currently used in practice on a wide range of live civil, power and building projects in the UK. Anecdotal evidences show that the system helps construction projects in saving costs, reducing risk and increa...

We present the implementation of a large-scale latency estimation system based on GNP and incorporated into the Google content delivery network. Our implementation employs standard features of contemporary Web clients, and carefully controls the overhead incurred by latency measurements using a scalable centralized scheduler. It also requires only a small number of CDN modifications, which make...