Josep M. Blanquer

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In this paper we describe Quorum, a non-invasive approach to scalable quality-of-service provisioning that uses traffic shaping, admission control, and response monitoring at the border of an Internet site to ensure throughput and response time guarantees. We experimentally compare an implementation of Quorum both to hardware over-provisioning and to(More)
The World Wide Web has become a primary venue for disseminating information to large numbers of users. From news stories, to music videos, to driving directions, more and more people are turning to the web to nd information they need in their day-today lives. As web-based services become more complex, the traditional web model is becoming insuf-cient. There(More)
In this paper we argue that the best approach to providing Quality of Service (QoS) guarantees to current Internet services is to use admission control and traffic shaping techniques at the entrance points of Internet hosting sites. We propose a black-box approach that does not require knowledge, instrumentation, or modification of the system (hardware and(More)
In this paper we describe Quorum: a new non-invasive software approach to scalable quality-of-service provisioning that uses traffic shaping, admission control, and response monitoring at the borders of the Internet hosting site to ensure throughput and response time guarantees. We compare Quorum both to over-provisioning and to Nep-tune – a research and(More)
The fast-paced growth of the Internet's user population is driving clustered architectures as the platform of choice for hosting high volume-services. The ability to provide a guaranteed service quality in such clustered architectures is becoming a need for today's e-businesses. Most companies that currently offer such service guarantees rely on(More)
The factors that control lichen distribution in Antarctica are still not well understood, and in this investigation we focused on the distribution, local and continental, and gas exchange of a species pair, closely related lichens with differing reproductive strategies, Usnea aurantiaco-atra (fertile) and Usnea antarctica (sterile, sorediate). The local(More)
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