Philip Perry

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CONTEXT Associations of major lipids and apolipoproteins with the risk of vascular disease have not been reliably quantified. OBJECTIVE To assess major lipids and apolipoproteins in vascular risk. DESIGN, SETTING, AND PARTICIPANTS Individual records were supplied on 302,430 people without initial vascular disease from 68 long-term prospective studies,(More)
CONTEXT Circulating concentration of lipoprotein(a) (Lp[a]), a large glycoprotein attached to a low-density lipoprotein-like particle, may be associated with risk of coronary heart disease (CHD) and stroke. OBJECTIVE To assess the relationship of Lp(a) concentration with risk of major vascular and nonvascular outcomes. STUDY SELECTION Long-term(More)
In general, video quality adaptation and video quality evaluation are distinct activities. Most adaptive delivery mechanisms for streaming multimedia content do not explicitly consider user-perceived quality when making adaptation decisions. Equally, video quality evaluation techniques are not designed to evaluate instantaneous quality where the quality is(More)
5 Background: In estrogen-receptor-positive (ER+) early breast cancer, 5 years of tamoxifen reduces breast cancer death rates by about a third throughout years 0-14. It has been uncertain how 10 years of tamoxifen compares with this. METHODS During 1991-2005, 6,953 women with ER+ (n=2755), or ER untested (4198, estimated 80% ER+ if status known) invasive(More)
A significant challenge in all-IP multi-service networks is to balance the goal of providing high-quality services to the end-users with the desire to maximize the number of end-users that can be simultaneously served. This paper presents a solution to this challenge by using the Quality-Oriented Adaptation Scheme (QOAS) for delivering multimedia streams.(More)
Many adaptive delivery mechanisms have been devised for streaming multimedia over best-effort IP networks. Most of these adaptive schemes do not consider the user's perception of quality when making adaptations. We propose that an optimum adaptation trajectory exists which indicates how encoding quality should be adapted (upgraded/downgraded) with respect(More)
This paper presents how SCTP can stall in multihomed scenarios during failover and under certain circumstances. A stall is where an SCTP end-point ceases to communicate for an extended period of time, but does not report any error to the upper layer. This paper presents two different sets of circumstances where a stall can occur: firstly when there is an(More)
Passive Optical Networks (PON) are thought to be the next step in the development of access networks and providing broadband access in the ”last mile” area. Ethernet PONs (EPONs) are gaining the most attention from industry as they offer a highly flexible, cost effective solution. In this paper, we present a new approach to the problem of optimal bandwidth(More)
Future communication networks will be faced with increasing and variable traffic demand, due largely to various services introduced on the Internet. One particular service that will greatly impact resource management of future communication networks is IPTV, which aims to provide users with a multitude of multimedia services (e.g. HD and SD) for both live(More)