239 research outputs found
EmoNets: Multimodal deep learning approaches for emotion recognition in video
The task of the emotion recognition in the wild (EmotiW) Challenge is to
assign one of seven emotions to short video clips extracted from Hollywood
style movies. The videos depict acted-out emotions under realistic conditions
with a large degree of variation in attributes such as pose and illumination,
making it worthwhile to explore approaches which consider combinations of
features from multiple modalities for label assignment. In this paper we
present our approach to learning several specialist models using deep learning
techniques, each focusing on one modality. Among these are a convolutional
neural network, focusing on capturing visual information in detected faces, a
deep belief net focusing on the representation of the audio stream, a K-Means
based "bag-of-mouths" model, which extracts visual features around the mouth
region and a relational autoencoder, which addresses spatio-temporal aspects of
videos. We explore multiple methods for the combination of cues from these
modalities into one common classifier. This achieves a considerably greater
accuracy than predictions from our strongest single-modality classifier. Our
method was the winning submission in the 2013 EmotiW challenge and achieved a
test set accuracy of 47.67% on the 2014 dataset
Coupled study by TEM/EELS and STM/STS of electronic properties of C- and CNx-nanotubes
Carbon nanotubes are the focus of considerable research efforts due to their
fascinating physical properties. They provide an excellent model system for the
study of one dimensional materials and molecular electronics. The chirality of
nanotubes can lead to very different electronic behaviours, either metallic or
semiconducting. Their electronic spectrum consists of a series of Van Hove
singularities defining a bandgap for semiconducting tubes and molecular
orbitals at the corresponding energies. A promising way to tune the nanotubes
electronic properties for future applications is to use doping by heteroatoms.
Here we report on experimental investigation of the role of many-body
interactions in nanotube bandgaps, the visualization in direct space of the
molecular orbitals of nanotubes and the properties of nitrogen doped nanotubes
using scanning tunneling microscopy and transmission electron microscopy as
well as electron energy loss spectroscopy
Altimetry for the future: Building on 25 years of progress
In 2018 we celebrated 25 years of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and more recently, in 2018, in Ponta Delgada, Portugal, 25 Years of Progress in Radar Altimetry. On this latter occasion it was decided to collect contributions of scientists, engineers and managers involved in the worldwide altimetry community to depict the state of altimetry and propose recommendations for the altimetry of the future. This paper summarizes contributions and recommendations that were collected and provides guidance for future mission design, research activities, and sustainable operational radar altimetry data exploitation. Recommendations provided are fundamental for optimizing further scientific and operational advances of oceanographic observations by altimetry, including requirements for spatial and temporal resolution of altimetric measurements, their accuracy and continuity. There are also new challenges and new openings mentioned in the paper that are particularly crucial for observations at higher latitudes, for coastal oceanography, for cryospheric studies and for hydrology. The paper starts with a general introduction followed by a section on Earth System Science including Ocean Dynamics, Sea Level, the Coastal Ocean, Hydrology, the Cryosphere and Polar Oceans and the ââGreenâ Ocean, extending the frontier from biogeochemistry to marine ecology. Applications are described in a subsequent section, which covers Operational Oceanography, Weather, Hurricane Wave and Wind Forecasting, Climate projection. Instrumentsâ development and satellite missionsâ evolutions are described in a fourth section. A fifth section covers the key observations that altimeters provide and their potential complements, from other Earth observation measurements to in situ data. Section 6 identifies the data and methods and provides some accuracy and resolution requirements for the wet tropospheric correction, the orbit and other geodetic requirements, the Mean Sea Surface, Geoid and Mean Dynamic Topography, Calibration and Validation, data accuracy, data access and handling (including the DUACS system). Section 7 brings a transversal view on scales, integration, artificial intelligence, and capacity building (education and training). Section 8 reviews the programmatic issues followed by a conclusion
Measurement of electroweak WZ boson production and search for new physics in WZ + two jets events in pp collisions at âs=13TeV
A measurement of WZ electroweak (EW) vector boson scattering is presented. The measurement is performed in the leptonic decay modes WZââÎœââČââČ, where â,ââČ=e,ÎŒ. The analysis is based on a data sample of proton-proton collisions at âs=13 TeV at the LHC collected with the CMS detector and corresponding to an integrated luminosity of 35.9 fbâ1. The WZ plus two jet production cross section is measured in fiducial regions with enhanced contributions from EW production and found to be consistent with standard model predictions. The EW WZ production in association with two jets is measured with an observed (expected) significance of 2.2 (2.5) standard deviations. Constraints on charged Higgs boson production and on anomalous quartic gauge couplings in terms of dimension-eight effective field theory operators are also presented
Altimetry for the future: building on 25 years of progress
In 2018 we celebrated 25âŻyears of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and more recently, in 2018, in Ponta Delgada, Portugal, 25 Years of Progress in Radar Altimetry. On this latter occasion it was decided to collect contributions of scientists, engineers and managers involved in the worldwide altimetry community to depict the state of altimetry and propose recommendations for the altimetry of the future. This paper summarizes contributions and recommendations that were collected and provides guidance for future mission design, research activities, and sustainable operational radar altimetry data exploitation. Recommendations provided are fundamental for optimizing further scientific and operational advances of oceanographic observations by altimetry, including requirements for spatial and temporal resolution of altimetric measurements, their accuracy and continuity. There are also new challenges and new openings mentioned in the paper that are particularly crucial for observations at higher latitudes, for coastal oceanography, for cryospheric studies and for hydrology.
The paper starts with a general introduction followed by a section on Earth System Science including Ocean Dynamics, Sea Level, the Coastal Ocean, Hydrology, the Cryosphere and Polar Oceans and the âGreenâ Ocean, extending the frontier from biogeochemistry to marine ecology. Applications are described in a subsequent section, which covers Operational Oceanography, Weather, Hurricane Wave and Wind Forecasting, Climate projection. Instrumentsâ development and satellite missionsâ evolutions are described in a fourth section. A fifth section covers the key observations that altimeters provide and their potential complements, from other Earth observation measurements to in situ data. Section 6 identifies the data and methods and provides some accuracy and resolution requirements for the wet tropospheric correction, the orbit and other geodetic requirements, the Mean Sea Surface, Geoid and Mean Dynamic Topography, Calibration and Validation, data accuracy, data access and handling (including the DUACS system). Section 7 brings a transversal view on scales, integration, artificial intelligence, and capacity building (education and training). Section 8 reviews the programmatic issues followed by a conclusion
COVID-19 symptoms at hospital admission vary with age and sex: results from the ISARIC prospective multinational observational study
Background:
The ISARIC prospective multinational observational study is the largest cohort of hospitalized patients with COVID-19. We present relationships of age, sex, and nationality to presenting symptoms.
Methods:
International, prospective observational study of 60â109 hospitalized symptomatic patients with laboratory-confirmed COVID-19 recruited from 43 countries between 30 January and 3 August 2020. Logistic regression was performed to evaluate relationships of age and sex to published COVID-19 case definitions and the most commonly reported symptoms.
Results:
âTypicalâ symptoms of fever (69%), cough (68%) and shortness of breath (66%) were the most commonly reported. 92% of patients experienced at least one of these. Prevalence of typical symptoms was greatest in 30- to 60-year-olds (respectively 80, 79, 69%; at least one 95%). They were reported less frequently in children (â€â18 years: 69, 48, 23; 85%), older adults (â„â70 years: 61, 62, 65; 90%), and women (66, 66, 64; 90%; vs. men 71, 70, 67; 93%, each Pâ<â0.001). The most common atypical presentations under 60 years of age were nausea and vomiting and abdominal pain, and over 60 years was confusion. Regression models showed significant differences in symptoms with sex, age and country.
Interpretation:
This international collaboration has allowed us to report reliable symptom data from the largest cohort of patients admitted to hospital with COVID-19. Adults over 60 and children admitted to hospital with COVID-19 are less likely to present with typical symptoms. Nausea and vomiting are common atypical presentations under 30 years. Confusion is a frequent atypical presentation of COVID-19 in adults over 60 years. Women are less likely to experience typical symptoms than men
The use of finite element methods in forensic medicine
L'activité médico-légale comporte fréquemment l'évaluation de mécanismes lésionnels à l'origine de lésions constatées que cela soit chez l'adulte ou chez l'enfant. Le segment anatomique le plus fréquemment atteint en cas d'accident ou de violences volontaPas de résum
The use of finite element methods in forensic medicine
L'activitĂ© mĂ©dico-lĂ©gale comporte frĂ©quemment l'Ă©valuation de mĂ©canismes lĂ©sionnels Ă l'origine de lĂ©sions constatĂ©es que cela soit chez l'adulte ou chez l'enfant. Le segment anatomique le plus frĂ©quemment atteint en cas d'accident ou de violences volontaires est reprĂ©sentĂ© par l'extrĂ©mitĂ© cervico-cĂ©phalique. Les traumatismes de l'extrĂ©mitĂ© cervico-cĂ©phalique sont la consĂ©quence mĂ©canique d'une mise en sollicitation excessive de la tĂȘte et de ses constituants. Quelque soit la nature du chargement mĂ©canique extĂ©rieur, par contact ou par inertie, la rĂ©ponse mĂ©canique des Ă©lĂ©ments anatomiques impliquĂ©s se traduit par des phĂ©nomĂšnes de dĂ©formation et de contrainte. Si la limite de tolĂ©rance d'un Ă©lĂ©ment anatomique est dĂ©passĂ©e, une lĂ©sion survient. L'analyse mĂ©dico-lĂ©gale des traumatismes de l'extrĂ©mitĂ© cervico-cĂ©phalique Ă©tait basĂ©e jusque trĂšs rĂ©cemment sur des avis d'Expert, certains empiriques, d'autres basĂ©s sur des travaux biomĂ©caniques. Le dĂ©veloppement de modĂšles numĂ©riques prĂ©dictifs de lĂ©sions permet d'enrichir l'analyse et l'interprĂ©tation mĂ©dico-lĂ©gale. Les modĂšles Ă©lĂ©ments finis n avaient, jusqu Ă ce travail, jamais Ă©tĂ© utilisĂ©s dans l'Ă©valuation mĂ©dico-lĂ©gale des traumatismes crĂąniens. Notre approche pluridisciplinaire rĂ©unissant la biomĂ©canique des chocs et la mĂ©decine lĂ©gale a permis de proposer un nouvel outil d'analyse dans le domaine mĂ©dico-lĂ©gal.RĂ©sumĂ© anglais : ide
Hématome sous-dural aigu du nourisson (des mécanismes au diagnostic.)
STRASBOURG-Medecine (674822101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF
Caractérisation et modélisation des organes abdominaux
Le pourcentage Ă©levĂ© de blessures dues Ă des traumatismes abdominaux survenant lors d accidents de la route mais Ă©galement la nĂ©cessitĂ© de dĂ©tecter des maladies (l'hĂ©patite virale, la cirrhose, le cancer etc.), ont conduits plusieurs chercheurs Ă Ă©tudier les propriĂ©tĂ©s mĂ©caniques des organes abdominaux Ă la fois in vivo et in vitro. Dans tous les MEF de corps humain actuellement disponibles, les organes abdominaux sont caractĂ©risĂ©s par des lois Ă©lastiques linĂ©aires ou viscoĂ©lastiques linĂ©aires, alors que ces matĂ©riaux montrent un comportement non linĂ©aire hyper Ă©lastique. L objectif de ce travail de thĂšse est de dĂ©velopper des modĂšles par Ă©lĂ©ments finis (MEF) robustes des diffĂ©rents organes de l abdomen tels que le foie, le rein et la rate. Pour ce faire des tests expĂ©rimentaux sur chacun des constituants de ces organes ont Ă©tĂ© rĂ©alisĂ©s dans le but de caractĂ©riser le comportement mĂ©canique de ceux-ci et de dĂ©terminer les propriĂ©tĂ©s mĂ©caniques inhĂ©rentes Ă ces constituants. Pour caractĂ©riser mĂ©caniquement ces diffĂ©rents constituants, des tests statiques ont donc Ă©tĂ© rĂ©alisĂ©s pour chacun des constituants du foie et du rein porcin Ă savoir, des tests de traction de la capsule de Glisson et de la capsule rĂ©nale ainsi que des veines hĂ©patiques, des tests de compression et de cisaillement pour le parenchyme hĂ©patique et le cortex rĂ©nale. Finalement la rate a Ă©tĂ© testĂ©e en compression statique. Les rĂ©sultats expĂ©rimentaux obtenus ont Ă©tĂ© utilisĂ©s afin de caractĂ©riser les tissus par des lois de comportement de type hyper Ă©lastique, viscoĂ©lastique et hyper viscoĂ©lastique sous la forme de modĂšles d'Ogden, Mooney Rivlin et Maxwell et implĂ©mentĂ©s dans les MEF porcin et humain dĂ©veloppĂ©s dans le cadre de cette thĂšse. Ces MEF ont ensuite Ă©tĂ© validĂ©s en regards de tests expĂ©rimentaux dynamiques in vivo rĂ©alisĂ©s sur modĂšle porcin et vis-Ă -vis de la littĂ©rature pour les MEF d organes humains. Ainsi, les MEF dĂ©veloppĂ©s dans cette Ă©tude sont les premiers modĂšles dĂ©taillĂ©s et validĂ©s et peuvent dĂ©sormais ĂȘtre utilisĂ©s dans le cadre de reconstructions d accidents mais Ă©galement pour des applications biomĂ©dicales dans le but de dĂ©velopper des environnements virtuels de chirurgie, de planifier les actes chirurgicaux et d aider les chirurgiens Ă l apprentissage de gestes.The objective of this study is to develop robust finite element models of abdominal organs (viz. liver, kidney and spleen), by performing experiments on each organ s constituents to extract the material properties. Understanding the mechanical properties of the organs of the human body is the most critical aspect of numerical modeling for medical applications and impact biomechanics. Many researchers work on identifying mechanical properties of these organs both in vivo and in vitro considering the high injury percentage of abdominal trauma in vehicle accidents and for easy detection of diseases such as viral hepatitis, cirrhosis, cancer etc. In all the current available finite element human body models the abdominal organs are characterized as linear elastic or linear visco-elastic material, where as the materials actually show a non linear hyper elastic behavior. In this study the organs are modeled for first time as hyper visco-elastic materials and with individual constituents of each (viz. the capsule and veins). To characterize the tissue, static experiments are performed on individual parts of the abdominal organs, like incase of liver, Glisson s capsule and hepatic veins are tested under static tension where as liver parenchyma is tested under static compression and under shear at low frequency. In case of kidneys, renal capsule is tested under static tension and renal cortex is tested under static compression, where as spleen tissue is tested under static compression. The results of the these experiments are used to characterize the tissues as hyper elastic, visco elastic and hyper visco elastic materials in the form of Ogden, Mooney Rivlin and Maxwell materials. These material models are further used to develop the finite element model of organs for human and pigs. The developed models are validated by performing in vivo dynamic tests on pigs, whereas using dynamic tests data from the literature on human liver and reproducing the same with the numerical approach in the LS Dyna explicit solver. The developed models are observed to be robust and can be used for accident reconstruction as well for biomedical applications viz., to develop virtual surgical environments & to plan surgeries or train surgeons.STRASBOURG-Bib.electronique 063 (674829902) / SudocSudocFranceF
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