134 research outputs found
Towards Modelling and Analysing Non-Functional Properties of Systems of Systems
International audienceSystems of systems (SoS) are large-scale systems composed of complex systems with difficult to predict emergent properties. One of the most significant challenges in the engineering of such systems if how to predict their Non-Functional Properties (NFP) such as performance and security, and more specifically, how to model NFP when the overall system functionality is not available. In this paper, we identify, describe and analyse challenges to modelling and analysing the performance and security NFP of SoS. We define an architectural framework to SoS NFP prediction based on the modelling of system interactions and their impacts. We adopt an Event Driven Architecture to support this modelling, as it allows for more realistic and flexible NFP simulation, which enables more accurate NFP prediction. A framework integrating the analysis of several NFP allows for exploring the impacts of changes made to accommodate issues on one NFP on other NFPs
An Access Control Model for Tree Data Structure
International audienceTrees are very often used to structure data. For instance, file systems are structured into trees and XML documents can be represented by trees. There are literally as many access control schemes as there are tree data structures. Consequently, an access control model which has been defined for a particular kind of tree cannot be easily adapted to another kind of tree. In this paper, we propose an access control model for generic tree data structures. This model can then be applied to any specific typed tree data structure
Pharmacokinetics of Intra-Arterial Melphalan in Patients withRecurrent or Progressive Retinoblastoma Treated on Spog-Rb-2011, A NationalPhase II Study of the Swiss Paediatric Oncology Group
Since the 1990s, intravenous (iv) chemotherapy has been the system-atic first-line treatment used in the management of retinoblastoma, to reduce tumour volumeand render it accessible to focal treatments as well as to avoid enucleation and/or radiother-apy. This approach has allowed globe preservation in the majority of group A-C tumors and in19-60% of group D cases. Relapse or tumour progression in this group D patients constitute amajor concern for globe salvage. Techniques of local administration of chemotherapy, such asSelective Ophtalmic Artery Chemotherapy (SOAC) administration offers an interesting alter-native. We report here pharmacokinetic analysis of melphalan administered by SOAC in eightpatients, their clinical response to SOAC and observed toxicities
Three new PAX6 mutations including one causing an unusual ophthalmic phenotype associated with neurodevelopmental abnormalities
The PAX6 gene was first described as a candidate for human aniridia. However, PAX6 expression is not restricted to the eye and it appears to be crucial for brain development. We studied PAX6 mutations in a large spectrum of patients who presented with aniridia phenotypes, Peters' anomaly, and anterior segment malformations associated or not with neurological anomalies.Journal ArticleResearch Support, Non-U.S. Gov'tSCOPUS: ar.jinfo:eu-repo/semantics/publishe
The mineralocorticoid receptor: insights into its molecular and (patho)physiological biology
The last decade has witnessed tremendous progress in the understanding of the mineralocorticoid receptor (MR), its molecular mechanism of action, and its implications for physiology and pathophysiology. After the initial cloning of MR, and identification of its gene structure and promoters, it now appears as a major actor in protein-protein interaction networks. The role of transcriptional coregulators and the determinants of mineralocorticoid selectivity have been elucidated. Targeted oncogenesis and transgenic mouse models have identified unexpected sites of MR expression and novel roles for MR in non-epithelial tissues. These experimental approaches have contributed to the generation of new cell lines for the characterization of aldosterone signaling pathways, and have also facilitated a better understanding of MR physiology in the heart, vasculature, brain and adipose tissues. This review describes the structure, molecular mechanism of action and transcriptional regulation mediated by MR, emphasizing the most recent developments at the cellular and molecular level. Finally, through insights obtained from mouse models and human disease, its role in physiology and pathophysiology will be reviewed. Future investigations of MR biology should lead to new therapeutic strategies, modulating cell-specific actions in the management of cardiovascular disease, neuroprotection, mineralocorticoid resistance, and metabolic disorders
The African cholera surveillance network (Africhol) consortium meeting, 10â11 June 2015, LomĂ©, Togo
Simulations expérimentale et numérique des effets retardés d'une explosion en milieu clos et en présence de produits liquides
Peut-on modĂ©liser de maniĂšre fiable les effets collatĂ©raux (en termes de quantitĂ© ou concentration de produits Ă©jectĂ©s) et les consĂ©quences dâune explosion en milieu clos, et en prĂ©sence de produits chimiques liquides ? Pour rĂ©pondre Ă cette vaste question, qui soulĂšve spontanĂ©ment de nombreux sous-problĂšmes, les travaux de thĂšse se sont dĂ©roulĂ©s en trois temps : 1/une Ă©tude qualitative et semi-quantitative du scĂ©nario gĂ©nĂ©ral, afin de comprendre le dĂ©roulement chronologique des Ă©vĂšnements, et dâĂ©mettre les hypothĂšses nĂ©cessaires Ă une modĂ©lisation, 2 /LâĂ©tude systĂ©matique des effets dâune explosion en milieu clos, en prĂ©sence ou non de produits liquides. Avant de modĂ©liser la dĂ©gradation du produit liquide soumis Ă une tempĂ©rature et Ă une pression Ă©levĂ©es, les expĂ©rimentations prĂ©liminaires ont en effet fait apparaĂźtre la nĂ©cessitĂ© de quantifier dans le temps et dans lâespace, les effets thermiques et mĂ©caniques dâune explosion Ă volume constant, 3/LâĂ©laboration de modĂšles 0D(t) Ă partir des conclusions prĂ©cĂ©dentes afin, dâune part, dâestimer la durĂ©e de vie dâune phase liquide dans un environnement thermodynamique contraint et, dâautre part, de dĂ©montrer la possibilitĂ© de modĂ©liser le problĂšme global de maniĂšre rĂ©duite. En effet, le terme source dâun tel Ă©vĂšnement ne peut ĂȘtre modĂ©lisĂ© par une libĂ©ration ponctuelle de produit : il sâagit dâune libĂ©ration Ă©tendue dans le temps, par le biais dâun Ă©coulement chaud a priori diphasique et de dĂ©bit variable. Les couplages des phĂ©nomĂšnes, observĂ©s expĂ©rimentalement, rendent nĂ©cessaires : 1 - Une modĂ©lisation instationnaire de lâĂ©volution de la pression et une estimation du niveau de tempĂ©rature atteint dans le volume dâĂ©tude, aprĂšs dĂ©tonation dâune charge explosive, 2 - Une modĂ©lisation de la libĂ©ration de la phase liquide dans lâenceinte, sous forme de gouttes millimĂ©triques ou de gouttelettes microniques 3 - Une modĂ©lisation instationnaire des transferts couplĂ©s de masse et dâĂ©nergie entre la phase liquide et la phase gazeuse en prĂ©sence et prise en compte dâĂ©ventuelles rĂ©actions chimiques Ă haute pression et haute tempĂ©rature 4 - Et enfin, une modĂ©lisation instationnaire des rejets Ă la brĂšche. LâĂ©tude dâune explosion Ă volume constant a montrĂ© quâil est possible de modĂ©liser de maniĂšre simple la montĂ©e continue en pression de lâenceinte par une fonction exponentielle croissante. Pour une configuration de rĂ©fĂ©rence donnĂ©e â explosion dâune sphĂšre dâexplosif dans un parallĂ©lĂ©pipĂšde â la valeur maximale de pression est directement proportionnelle au taux de chargement en explosif, sur lâintervalle [0,01 â 0,6] kg/m3. Le passage Ă une gĂ©omĂ©trie diffĂ©rente ou plus complexe demande lâintroduction dâun coefficient correctif pour traduire lâamplification (ou lâattĂ©nuation) de la combustion turbulente des produits de dĂ©tonation avec lâair ambiant. En ce qui concerne le champ de tempĂ©rature par contre, notre analyse a montrĂ© quâil coexiste des zones chaudes et des zones dites « froides » et que la valeur de tempĂ©rature homogĂšne finale calculĂ©e Ă partir dâun code thermochimique ne peut constituer quâune simple indication. Seule une estimation du volume respectif de ces zones a Ă©tĂ© proposĂ©e ici. Nous avons Ă©tabli que les propriĂ©tĂ©s physico-chimiques des produits stockĂ©s sont un point clef du problĂšme et on suppose ces donnĂ©es connues pour une gamme de produits chimiques liquides Ă pression ambiante, communĂ©ment utilisĂ©s dans lâindustrie. Seul le phĂ©nomĂšne dâĂ©vaporation a Ă©tĂ© dĂ©veloppĂ© dans ce mĂ©moire. Lâintroduction de rĂ©actions chimiques entre constituants se traduirait dans les modĂšles par des termes sources supplĂ©mentaires liĂ©s Ă lâapparition ou la disparition dâespĂšces.Is it possible to model collateral effects due to an explosion (on a chemical facility for instance) occuring in a closed volume containing liquid chemical products storage units ?This thesis deals with a zerodimensionnal modelisation of such a 3D complex problem to asses the final thermodynamic state of chemical products released in the atmosphere. Developped sub-models take into account:- the unsteady time histories of the internal overpressure and temperature,- the unsteady liquid ejection (droplets sizes)- the unsteady modelisation of the local heat and mass transfers between the gas phase and the liquid phase- the unsteady ejection process of the resulting multiphase mixture in the environment.Models and sub-models are validated thanks to many experimental results
Danger des essences et des huiles essentielles en automédication
MONTPELLIER-BU Pharmacie (341722105) / SudocSudocFranceF
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