The University of Kent is a public research university based in Kent, United Kingdom. It was founded in 1965 and is regarded as one of the UK's "plate glass universities". The University of Kent's main site is a rural campus just north of Canterbury situated within 300 acres of park land, which houses over 4,300 students. Wikipedia.
Zhu H.,University of Kent
IEEE Journal on Selected Areas in Communications | Year: 2011
The microcellular system and distributed antenna system (DAS) are two promising systems for future high data rate wireless communications, since both systems can reduce the radio transmission distance between the transmitter and the receiver. This paper aims to compare the average spectrum efficiency and the cell edge spectrum efficiency between the two cellular systems in the downlink transmission. In order to achieve high spectrum efficiency, frequency reuse and/or spatial diversity are exploited in these two systems. The performances between the two cellular systems are theoretically compared in a network topology with seven macrocells, each of which has seven hexagonal sectors (or microcells). Moreover, the approach of antenna unit selection in the DAS for spatial diversity is presented. Numerical results show that the average spectrum efficiency per sector and the cell edge spectrum efficiency in the microcellular system are better than those in the DAS without frequency reuse. However, when the frequency reuse is considered in the DAS, the DAS outperforms the microcellular system in both of the average and cell edge spectrum efficiencies. © 2011 IEEE.
Abrams D.,University of Kent
Child Development | Year: 2011
Does children's bias toward their own groups reflect egocentrism or social understanding? After being categorized as belonging to 1 of 2 fictitious groups, 157 six- to ten-year-olds evaluated group members and expressed preferences among neutral items. Children who expected the in-group to share their item preferences (egocentric social projection) showed intergroup bias. However, most bias was expressed by children who expected their in-group to share, but the out-group to oppose, their own evaluations of members. These oppositional expectations were associated with better social perspective taking, and better understanding that groups expect loyalty from their members. Consistent with the developmental model of subjective group dynamics (D. Abrams, A. Rutland, J. Pelletier, & J. M. Ferrell, 2009), social understanding, rather than egocentrism, provides a more parsimonious explanation of children's intergroup bias. © 2011 The Author. Child Development © 2011 Society for Research in Child Development, Inc.
Beal D.M.,University of Kent |
Angewandte Chemie - International Edition | Year: 2012
Heteromultifunctional scaffolds that harness sequential "click" reactions will find significant utility in the areas of chemical biology and chemically enabled/enhanced biotherapeutics ("chemologics"). Here we review the existing synthetic technologies that illustrate the considerable potential of the field. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Tuite M.F.,University of Kent |
Serio T.R.,Brown University
Nature Reviews Molecular Cell Biology | Year: 2010
Prions are unusual proteinaceous infectious agents that are typically associated with a class of fatal degenerative diseases of the mammalian brain. However, the discovery of fungal prions, which are not associated with disease, suggests that we must now consider the effect of these factors on basic cellular physiology in a different light. Fungal prions are epigenetic determinants that can alter a range of cellular processes, including metabolism and gene expression pathways, and these changes can lead to a range of prion-associated phenotypes. The mechanistic similarities between prion propagation in mammals and fungi suggest that prions are not a biological anomaly but instead could be a newly appreciated and perhaps ubiquitous regulatory mechanism. © 2010 Macmillan Publishers Limited. All rights reserved.
Zhu H.,University of Kent
IEEE Communications Magazine | Year: 2012
The cooperative distributed antenna system (DAS) is one of the promising systems for future high-data-rate mobile communications, since the DAS can reduce the radio transmission distance between the transmitter and the receiver by distributing multiple remote antenna units in the traditional cellular network. In order to achieve high spectrum efficiency in the DAS, frequency reuse is considered. In this article, two values of frequency reuse factor are considered in conjunction with cooperative spatial diversity. In order to show the advantage of introducing frequency reuse, the performance of the DAS with frequency reuse is compared with that without frequency reuse. Results show that the DAS with frequency reuse outperforms the DAS without frequency reuse in the average spectrum efficiency per sector and the cell edge spectrum efficiency. The DAS with larger frequency reuse factor outperforms the DAS with smaller frequency reuse factor for a large range of signalto-noise ratio. © 1979-2012 IEEE.