245 research outputs found
Optimal packetisation of MPEG-4 using RTP over mobile networks
The introduction of third-generation wireless networks should result in real-time mobile
video communications becoming a reality. Delivery of such video is likely to be facilitated by the realtime
transport protocol (RTP). Careful packetisation of the video data is necessary to ensure the
optimal trade-off between channel utilisation and error robustness. Theoretical analyses for two basic
schemes of MPEG-4 data encapsulation within RTP packets are presented. Simulations over a GPRS
(general packet radio service) network are used to validate the analysis of the most efficient scheme.
Finally, a motion adaptive system for deriving MPEG-4 video packet sizes is presented. Further
simulations demonstrate the benefits of the adaptive system
Genetic Association Signal Near NTN4 in Tourette Syndrome
Tourette syndrome (TS) is a neurodevelopmental disorder with a complex genetic etiology. Through an international collaboration, we genotyped 42 single nucleotide polymorphisms (p \u3c 10(-3)) from the recent TS genomewide association study (GWAS) in 609 independent cases and 610 ancestry-matched controls. Only rs2060546 on chromosome 12q22 (p = 3.3 x 10 (-4)) remained significant after Bonferroni correction. Meta-analysis with the original GWAS yielded the strongest association to date (p = 5.8 x 10 (7)). Although its functional significance is unclear, rs2060546 lies closest to NTN4, an axon guidance molecule expressed in developing striatum. Risk score analysis significantly predicted case-control status (p - 0.042), suggesting that many of these variants are true TS risk alleles
Additional Suppression from High Density Effects
At high energies the saturation effects associated to the high parton density
should modify the behavior of the observables in proton-nucleus and
nucleus-nucleus scattering. In this paper we investigate the saturation effects
in the nuclear production and estimate the modifications in the energy
dependence of the cross section as well as in the length of the nuclear medium.
In particular, we calculate the ratio of to Drell-Yan cross sections
and show that it is strongly modified if the high density effects are included.
Moreover, our results are compared with the data from the NA50 Collaboration
and predictions for the RHIC and LHC kinematic regions are presented. We
predict an additional suppression associated to the high density
effects.Comment: 13 pages, 5 figures, version to be published in Eur. Phys. J.
Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV
We report the first measurement of charged particle elliptic flow in Pb-Pb
collisions at 2.76 TeV with the ALICE detector at the CERN Large Hadron
Collider. The measurement is performed in the central pseudorapidity region
(||<0.8) and transverse momentum range 0.2< < 5.0 GeV/. The
elliptic flow signal v, measured using the 4-particle correlation method,
averaged over transverse momentum and pseudorapidity is 0.087 0.002
(stat) 0.004 (syst) in the 40-50% centrality class. The differential
elliptic flow v reaches a maximum of 0.2 near = 3
GeV/. Compared to RHIC Au-Au collisions at 200 GeV, the elliptic flow
increases by about 30%. Some hydrodynamic model predictions which include
viscous corrections are in agreement with the observed increase.Comment: 10 pages, 4 captioned figures, published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/389
Two-pion Bose-Einstein correlations in central Pb-Pb collisions at = 2.76 TeV
The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb
collisions at TeV at the Large Hadron Collider is
presented. We observe a growing trend with energy now not only for the
longitudinal and the outward but also for the sideward pion source radius. The
pion homogeneity volume and the decoupling time are significantly larger than
those measured at RHIC.Comment: 17 pages, 5 captioned figures, 1 table, authors from page 12,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/388
Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at TeV
Inclusive transverse momentum spectra of primary charged particles in Pb-Pb
collisions at = 2.76 TeV have been measured by the ALICE
Collaboration at the LHC. The data are presented for central and peripheral
collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross
section. The measured charged particle spectra in and GeV/ are compared to the expectation in pp collisions at the same
, scaled by the number of underlying nucleon-nucleon
collisions. The comparison is expressed in terms of the nuclear modification
factor . The result indicates only weak medium effects ( 0.7) in peripheral collisions. In central collisions,
reaches a minimum of about 0.14 at -7GeV/ and increases
significantly at larger . The measured suppression of high- particles is stronger than that observed at lower collision energies,
indicating that a very dense medium is formed in central Pb-Pb collisions at
the LHC.Comment: 15 pages, 5 captioned figures, 3 tables, authors from page 10,
published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/98
The Universal Kummer Threefold
The universal Kummer threefold is a 9-dimensional variety that represents the
total space of the 6-dimensional family of Kummer threefolds in 7-dimensional
projective space. We compute defining polynomials for three versions of this
family, over the Satake hypersurface, over the G\"opel variety, and over the
reflection representation of type E7. We develop classical themes such as theta
functions and Coble's quartic hypersurface using current tools from
combinatorics, geometry, and commutative algebra. Symbolic and numerical
computations for genus 3 moduli spaces appear alongside toric and tropical
methods.Comment: 50 pages; v2: added Remark 4.3, strengthened Lemma 8.3; v3: added
references and added supplementary files to sourc
Heart failure and diabetes: metabolic alterations and therapeutic interventions: a state-of-the-art review from the Translational Research Committee of the Heart Failure Association-European Society of Cardiology.
Altres ajuts: C.M. is supported by the Deutsche Forschungsgemeinschaft (DFG; SFB 894, TRR-219, and Ma 2528/7-1), the German Federal Ministry of Education and Science (BMBF; 01EO1504) and the Corona foundation. J.B. is supported by the DFG (SFB 1118) and the DZHK (German Centre for Cardiovascular Research) and by the BMBF. M.L. is supported by the DFG (SFB TRR 219M-03). R.B. is supported by the Netherlands Heart Foundation (CVON DOSIS 2014-40, CVON SHE-PREDICTS-HF 2017-21, and CVON RED-CVD 2017-11); and the Innovational Research Incentives Scheme program of the Netherlands Organization for Scientific Research (NWO VIDI, grant 917.13.350). N.M. is supported by the DFG (SFB TRR 219M-03, M-05). H.T. is supported by grants from the National Institutes of Health of the US Public Health Service (HL-RO1 061483 and HL-RO1 073162). A.B.G. was supported by grants from the Ministerio de Educación y Ciencia , Fundació La MARATÓ de TV3 (201502, 201516), CIBER Cardiovascular (CB16/11/00403), and AdvanceCat 2014-2020. H.B. is supported by the DFG (Bu2126/3-1). A.D.C. was supported by 'FIL' funds for research from University of Parma. A.G. was supported by grants from the European Union Commission's FP7 programme (HOMAGE and FIBROTARGETS) and ERA-CVD Joint Transnational Call 2016 LYMIT-DIS. G.R. acknowledges recent funding from The Cunningham Trust, MRC (MR/K012924/1) and the Diabetes UK RW and JM Collins studentship. S.H. received funding from the European Union Commission's Seventh Framework programme (2007-2013) under grant agreement N° 305507 (HOMAGE), N° 602904 (FIBROTARGETS) and N° 602156 (HECATOS). S.H. acknowledges the support from the Netherlands Cardiovascular Research Initiative: an initiative with support of the Dutch Heart Foundation, CVON-ARENA-PRIME, CVON-EARLY HFPEF, and SHE-PREDICTS. This research is co-financed as a PPP-allowance Research and Innovation by the Ministry of Economic Affairs within Top Sector Life sciences & Health
Realising the right to data portability for the domestic Internet of Things
There is an increasing role for the IT design community to play in regulation
of emerging IT. Article 25 of the EU General Data Protection Regulation (GDPR)
2016 puts this on a strict legal basis by establishing the need for information
privacy by design and default (PbD) for personal data-driven technologies.
Against this backdrop, we examine legal, commercial and technical perspectives
around the newly created legal right to data portability (RTDP) in GDPR. We are
motivated by a pressing need to address regulatory challenges stemming from the
Internet of Things (IoT). We need to find channels to support the protection of
these new legal rights for users in practice. In Part I we introduce the
internet of things and information PbD in more detail. We briefly consider
regulatory challenges posed by the IoT and the nature and practical challenges
surrounding the regulatory response of information privacy by design. In Part
II, we look in depth at the legal nature of the RTDP, determining what it
requires from IT designers in practice but also limitations on the right and
how it relates to IoT. In Part III we focus on technical approaches that can
support the realisation of the right. We consider the state of the art in data
management architectures, tools and platforms that can provide portability,
increased transparency and user control over the data flows. In Part IV, we
bring our perspectives together to reflect on the technical, legal and business
barriers and opportunities that will shape the implementation of the RTDP in
practice, and how the relationships may shape emerging IoT innovation and
business models. We finish with brief conclusions about the future for the RTDP
and PbD in the IoT
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