205 research outputs found
Transfert sécurisée d'une RI sans perte par une méthode d'insertion de données robuste à la compression JPEG
Dans cet article, nous prĂ©sentons une mĂ©thode d'insertion de donnĂ©es cachĂ©es originale permettant de protĂ©ger la haute rĂ©solution d'une rĂ©gion d'intĂ©rĂȘt. Les pertes de rĂ©solution dans la rĂ©gion d'intĂ©rĂȘt sont rĂ©cupĂ©rĂ©es puis insĂ©rĂ©es par marquage dans l'image. L'image avec la rĂ©gion d'intĂ©rĂȘt sans perte sera visible seulement aprĂšs l'extraction et la reconstruction de celle-ci. La mĂ©thode d'insertion s'appuie sur les coefficients DCT et sur la modification de la matrice de quantification. Cette technique a Ă©tĂ© dĂ©veloppĂ©e de maniĂšre Ă ĂȘtre robuste Ă la compression JPEG
Data Hiding Based on Connectivity Modification of 3D Mesh
Day by day, the amount of digital data has been rapidly increasing on the Internet. The size of 3D objects is very large
and these objects need fast transmissions. Moreover, 3D data security becomes increasingly important for many
applications, e.g., confidential transmission, video surveillance, military and medical applications. In this paper we
present two new approaches of 3D object data hiding without changing the position of vertices in the 3D space. The
main idea of the two proposed methods is to find and to synchronize particular areas of the 3D objects used to embed
the message. The embedding is done by changing the connectivity of edges in the selected areas composed of
quadrangles. The first proposed approach of data hiding in 3D objects is based on minimum spanning tree (MST) while
the second approach is based on the projection on a secret axis of the quadrangle centers. These methods are lossless in the sense that the positions of the vertices are unchanged. Moreover they are blind and do not depend of the order of
the data in the files. These two approaches are very interesting when the 3D objects have been digitalized with high
precision.De nos jours, des visualisations ainsi que des transferts dâobjets 3D sont couramment effectuĂ©s pour de
nombreuses applications allant du jeu vidĂ©o Ă lâimagerie mĂ©dicale en passant par lâindustrie manufacturiĂšre.
Dans cet article nous proposons deux nouvelles méthodes permettant de dissimuler des données dans des
objets 3D sans modifier la position des sommets. LâidĂ©e principale des deux mĂ©thodes prĂ©sentĂ©es est
de trouver et de synchroniser des zones particuliĂšres dans lâobjet 3D pouvant ĂȘtre utilisĂ©es pour insĂ©rer
le message. Lâinsertion de donnĂ©es sâappuie sur la modification de la connexitĂ© des arĂȘtes dans les zones
sélectionnées composées de quadrangles. La différence entre les deux méthodes présentées est la maniÚre
de sĂ©lectionner et de synchroniser ces zones dâinsertion. Alors que la premiĂšre mĂ©thode sâappuie sur un arbre
couvrant minimum (ACM), la seconde méthode utilise un axe sur lequel sont projetés les centres des zones
dâinsertion. Ces deux mĂ©thodes aveugles, protĂ©gĂ©es par utilisation de clefs secrĂštes, rĂ©sistent
Ă des transformations gĂ©omĂ©triques tels que les rotations, translations ou changement dâĂ©chelle et ne sont
pas perturbĂ©es par des modifications directes de lâordre des donnĂ©es dans les fichiers originaux.
Ces approches trouvent un intĂ©rĂȘt certain pour des objets 3D dont les sommets ont Ă©tĂ© acquis avec une
grande prĂ©cision et dont la modification nâest pas acceptable
Left atrial decompression through unidirectional left-to-right interatrial shunt for the treatment of left heart failure : first-inman experience with the V-Wave device
Aims: Elevated filling pressures of the left atrium (LA) are associated with poorer outcomes in patients with
chronic heart failure. The V-Wave is a new percutaneously implanted device intended to decrease the LA
pressure by the shunting of blood from the LA to the right atrium. This report describes the first-in-man experience
with the V-Wave device.
Methods and results: A 70-year-old man with a history of heart failure of ischaemic origin, left ventricular
dysfunction (LVEF: 35%, pulmonary wedge: 19 mmHg), no right heart dysfunction, NYHA Class III and
orthopnoea despite optimal treatment, was accepted for V-Wave device implantation. The device consists of
an ePTFE encapsulated nitinol frame that is implanted at the level of the interatrial septum and contains
a trileaflet pericardium tissue valve sutured inside which allows a unidirectional LA to right atrium shunt. The
procedure was performed through a transfemoral venous approach under fluoroscopic and TEE guidance.
The device was successfully implanted and the patient was discharged 24 hours after the procedure with no
complications. At three-month follow-up a left-to-right shunt through the device was confirmed by TEE. The
patient was in NYHA Class II, without orthopnoea, the Kansas City Cardiomyopathy index was 77.6 (from
39.1 at baseline) and NT-proBNP was 322 ng/mL (from 502 ng/mL at baseline). The QP/QS was 1.17 and the
pulmonary wedge was 8 mmHg, with no changes in pulmonary pressure or right ventricular function.
Conclusions: Left atrial decompression through a unidirectional left-to-right interatrial shunt represents a new
concept for the treatment of patients with left ventricular failure. The present report shows the feasibility of
applying this new therapy with the successful and uneventful implantation of the V-Wave device, which was
associated with significant improvement in functional, quality of life and haemodynamic parameters at 90 days
Resumeq: A Novel Way of Monitoring Equine Diseases Through the Centralization of Necropsy Data
The French surveillance network for causes of equine mortality (Resumeq) was created in 2015 for the qualitative surveillance of equine mortality through the centralization in a national database of necropsy data and their subsequent epidemiological analysis. It was designed to identify the causes of equine mortality, monitor their evolution over time and space, and detect emerging diseases as early as possible. Resumeq is an event-based surveillance system involving various players and structures. It is organized around a steering body, a scientific and technical support committee and a coordination unit. Different tools have been developed specifically for Resumeq. These include standardized necropsy protocols, a thesaurus for the anatomopathological terms and the causes of equine death, and an interactive web application so that network contributors can display data analysis results. The four French veterinary schools, seventeen veterinary laboratories, and ten veterinary clinics already contribute to the production and centralization of standardized data. To date, the data from around 1,000 equine necropsies have been centralized. While most deaths were located in western France, the geographic coverage is gradually improving. Data analysis allows the main causes of death to be ranked and major threats identified on a local, regional or national level. Initial results demonstrate the feasibility and benefits of this national surveillance tool. Moreover, in the future, this surveillance could take an international dimension if several countries decided to jointly capitalize on their necropsy data
Orofacial myofunctional rehabilitation and multidisciplinary management of obstructive sleep-disordered breathing
info:eu-repo/semantics/publishedVersio
Myocardial injury following transcatheter aortic valve implantation : insights from delayed-enhancement cardiovascular magnetic resonance
Aims: The aim of this study was to evaluate the presence, localisation and extent of myocardial injury as
determined by late gadolinium enhancement (LGE) on cardiovascular magnetic resonance (CMR) imaging
in patients undergoing transcatheter aortic valve implantation (TAVI).
Methods and results: A total of 37 patients, who underwent successful TAVI with a balloon-expandable
valve (transapical [TA], n=11; non-TA, n=26), were included. Cardiac biomarker (CK-MB and cTnT) lev-
els were determined at baseline and following TAVI. CMR was performed within a week before and within
30 days following TAVI. Some increase in cardiac biomarkers was detected in 97% of the patients as deter-
mined by a rise in cTnT, and in 49% of the patients as determined by a rise in CK-MB. Following TAVI, no
new myocardial necrosis defects were observed with the non-TA approach. Nonetheless, all patients who
underwent TAVI through the TA approach had new focal myocardial necrosis in the apex, with a median myo-cardial extent and necrotic mass of 5% [2.0-7.0] and 3.5 g [2.3-4.5], respectively.
Conclusions: Although some increase in cardiac biomarkers of myocardial injury was systematically
detected following TAVI, new myocardial necrosis as evaluated by CMR was observed only in patients
undergoing the procedure through the TA approach, involving ~5% of the myocardium in the apex
TCT-691 Clinical Impact of the Presence of Aortic Regurgitation Following Transcatheter Aortic Valve Replacement:Insights into the Degree and Acuteness of Presentation
Defining the scope of the European Antimicrobial Resistance Surveillance network in Veterinary medicine (EARS-Vet): a bottom-up and One Health approach
Background Building the European Antimicrobial Resistance Surveillance network in Veterinary medicine (EARS-Vet) was proposed to strengthen the European One Health antimicrobial resistance (AMR) surveillance approach. Objectives To define the combinations of animal species/production types/age categories/bacterial species/specimens/antimicrobials to be monitored in EARS-Vet. Methods The EARS-Vet scope was defined by consensus between 26 European experts. Decisions were guided by a survey of the combinations that are relevant and feasible to monitor in diseased animals in 13 European countries (bottom-up approach). Experts also considered the One Health approach and the need for EARS-Vet to complement existing European AMR monitoring systems coordinated by the ECDC and the European Food Safety Authority (EFSA). Results EARS-Vet plans to monitor AMR in six animal species [cattle, swine, chickens (broilers and laying hens), turkeys, cats and dogs], for 11 bacterial species (Escherichia coli, Klebsiella pneumoniae, Mannheimia haemolytica, Pasteurella multocida, Actinobacillus pleuropneumoniae, Staphylococcus aureus, Staphylococcus pseudintermedius, Staphylococcus hyicus, Streptococcus uberis, Streptococcus dysgalactiae and Streptococcus suis). Relevant antimicrobials for their treatment were selected (e.g. tetracyclines) and complemented with antimicrobials of more specific public health interest (e.g. carbapenems). Molecular data detecting the presence of ESBLs, AmpC cephalosporinases and methicillin resistance shall be collected too. Conclusions A preliminary EARS-Vet scope was defined, with the potential to fill important AMR monitoring gaps in the animal sector in Europe. It should be reviewed and expanded as the epidemiology of AMR changes, more countries participate and national monitoring capacities improve.Peer reviewe
The Halogenated Metabolism of Brown Algae (Phaeophyta), Its Biological Importance and Its Environmental Significance
Brown algae represent a major component of littoral and sublittoral zones in temperate and subtropical ecosystems. An essential adaptive feature of this independent eukaryotic lineage is the ability to couple oxidative reactions resulting from exposure to sunlight and air with the halogenations of various substrates, thereby addressing various biotic and abiotic stresses i.e., defense against predators, tissue repair, holdfast adhesion, and protection against reactive species generated by oxidative processes. Whereas marine organisms mainly make use of bromine to increase the biological activity of secondary metabolites, some orders of brown algae such as Laminariales have also developed a striking capability to accumulate and to use iodine in physiological adaptations to stress. We review selected aspects of the halogenated metabolism of macrophytic brown algae in the light of the most recent results, which point toward novel functions for iodide accumulation in kelps and the importance of bromination in cell wall modifications and adhesion properties of brown algal propagules. The importance of halogen speciation processes ranges from microbiology to biogeochemistry, through enzymology, cellular biology and ecotoxicology
Consensus statement on the orofacial myofunctional assessment and therapy in patients with OSA: proposal of an international Delphi Method process
La rééducation myofonctionnelle orofaciale a été montrée efficace dans la prise en charge multidisciplinaire
du syndrome dâapnĂ©es obstructives du sommeil chez lâenfant, lâadolescent et lâadulte, et elle est prescrite Ă
plusieurs Ă©tapes de ces prises en charge. Cependant, compte tenu du manque dâhomogĂ©nĂ©itĂ© des protocoles
de traitement et de mesures des résultats, du manque de recherches sur le type, la fréquence et la durée des
exercices myofonctionnels et sur les phénotypes spécifiques qui peuvent en bénéficier, il apparait nécessaire de définir des recommandations de bonne pratique. Un consensus de recommandations Delphi consacré
Ă lâĂ©valuation et au traitement myofonctionnel orofacial pour les patients atteints de SAOS, a Ă©tĂ© mis en oeuvre Ă lâinitiative de Marc Richard Moeller. Les deux premiĂšres Ă©tapes du consensus de recommandations Delphi sont achevĂ©es. La troisiĂšme Ă©tape, consacrĂ©e Ă lâĂ©laboration du questionnaire aura lieu lors de la rĂ©union conjointe de la World Sleep Society et de lâAcademy of Applied Myofunctional Sciences, en mars 2022 Ă Rome. Les conclusions du consensus de recommandations Delphi seront publiĂ©es lâannĂ©e suivante et largement diffusĂ©es.info:eu-repo/semantics/publishedVersio
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