WorldWideScience

Sample records for certification ensemble une

  1. Patient safety certification in a Department of Intensive Care Medicine: our experience with standard UNE 179003:2013.

    Science.gov (United States)

    Merino, P; Bustamante, E; Campillo-Artero, C; Bartual, E; Tuero, G; Marí, J

    2014-01-01

    Systematic and structured methods must be used to ensure that healthcare risks are effectively managed. Spanish standard UNE 179003:2013 provides healthcare organizations with a framework and a systematic protocol for managing patient safety from a clinical and organizational perspective. Furthermore, it is useful in securing an efficient balance among health risk, health outcomes and costs. The UNE 179003:2013 certifies that a clinical service complies with rules and operating procedures aimed at reducing the incidence of adverse events. It also requires mandatory continuous improvement, given that the standard entails frequent monitoring of the risk management system through periodic audits. The aims of this paper are to describe the UNE 179003:2013 certification process in an Intensive Care Unit, propose a risk management program for critical patients, and offer some recommendations regarding its implementation.

  2. Les interpr\\'etations de la m\\'ecanique quantique : une vue d'ensemble introductive

    CERN Document Server

    Boyer-Kassem, Thomas

    2015-01-01

    La m\\'ecanique quantique est une th\\'eorie physique contemporaine r\\'eput\\'ee pour ses d\\'efis au sens commun et ses paradoxes. Depuis bient\\^ot un si\\`ecle, plusieurs interpr\\'etations de la th\\'eorie ont \\'et\\'e propos\\'ees par les physiciens et les philosophes, offrant des images quantiques du monde, ou des m\\'etaphysiques, radicalement diff\\'erentes. L'existence d'un hasard fondamental, ou d'une multitude de mondes en-dehors du n\\^otre, d\\'epend ainsi de l'interpr\\'etation adopt\\'ee. Cet article, en s'appuyant sur le livre Boyer-Kassem (2015), Qu'est-ce que la m\\'ecanique quantique ?, pr\\'esente trois principales interpr\\'etations quantiques, empiriquement \\'equivalentes : l'interpr\\'etation dite orthodoxe, l'interpr\\'etation de Bohm, et l'interpr\\'etation des mondes multiples. Quantum mechanics is a contemporary physical theory which is famous for its paradoxes. For about a century, several interpretations of the theory have been proposed by physicists and philosophers, giving very different images of th...

  3. Ensembles

    OpenAIRE

    2012-01-01

    Licence; En 1935, un groupe de mathématiciens français eut l'ambition de reconstruire tout l'édifice mathématique (sans S pour bien montrer l'unité) selon la pensée formaliste de Hilbert. Les membres fondateurs ont été Henri Cartan, Claude Chevalley, Jean Delsarte, Jean Dieudonné, André Weil auxquels se joindra René de Possel. En juillet 1935 fut donc créé, lors d'un séminaire en Auvergne le groupe 'Nicolas Bourbaki'. Le nom de cette association fait référence en fait à une anecdote qui se pa...

  4. Les interprétations de la mécanique quantique: : une vue d'ensemble introductive

    NARCIS (Netherlands)

    Boyer, Thomas

    2015-01-01

    La mécanique quantique est une théorie physique contemporaine réputée pour ses défis au sens commun et ses paradoxes. Depuis bientôt un siècle, plusieurs interprétations de la théorie ont été proposées par les physiciens et les philosophes, offrant des images quantiques du monde, ou des métaphysique

  5. Influence d'une modulation avec référence à valeur moyenne variable dans un ensemble convertisseur-machine

    Science.gov (United States)

    Bouscayrol, Alain; Pietrzak-David, Maria; de Fornel, Bernard; Foch, Henri

    1994-06-01

    Pulse Width Modulation (PWM) new techniques give better inverter output voltages. So, a potential difference is introduced between the inverter artificial reference point O and the machine neutral point N. This paper proposes a new parameter for the PWM modelling, to represent this O-N voltage variation in the inverter control. This potential difference imposes a system decomposition on the converter-machine set : each reference point is associated to own reference frame. Firstly, the standard case V_NO=0 is studied by the analysis tools. Then, the influence of a V_NO continuous value voltage is shown on the voltage harmonic spectrum and on the machine behaviour. Lastly, a study of PWM with third harmonic injection is realized and shows interest of the new PWM modelling for modern modulations, Les nouvelles techniques de modulation par largeur d'impulsion (MLI) permettent aux ensembles convertisseur-machine de disposer d'un meilleur rapport de tension. En fait, elles imposent une différence de potentiel entre le point de référence de l'onduleur, O, et le point neutre de la machine, N. Cet article propose une nouvelle modélisation de la MLI, avec un degré de liberté supplémentaire, pour prendre en compte cette variation de tension entre O et N (V_NO) dans la commande de l'onduleur. L'utilisation de V_No dans la boucle de commande de l'ensemble convertisseur-machine, nécessite alors la décomposition du système par l'intermédiaire de deux référentiels associés à chaque point de référence. Après avoir vérifié ces deux outils d'analyse dans le cas standard où V_NO = 0, nous étudions l'influence d'un V_NO de type continu sur le spectre des harmoniques de tension et sur le comportement de la machine. Enfin, une étude sur la MLI avec injection d'harmonique 3 valide l'intérêt de cette nouvelle approche quant à l'analyse de modulations moins classiques.

  6. L’imagier franco-allemand du Monde et de la Frankfurter Allgemeine Zeitung. Une rhétorique du Vivre-Ensemble

    Directory of Open Access Journals (Sweden)

    Juliette Charbonneaux

    2014-04-01

    Full Text Available L’omniprésence et l’abondance des images associant en une figure dirigeants français et allemands dans les médias européens contemporains tendent à laisser penser que ce motif a toujours été là, disponible pour dire et écrire l’actualité. Pourtant, il semble peu probable qu’au sortir de la seconde guerre mondiale il en ait été de même. Dans cette perspective, l’article vise à déconstruire cet effet d’évidence en interrogeant le rôle et la place tenus par les images périodiques dans la construction et l’institution d’une figure du « vivre-ensemble » franco-allemand. Cette opération prend la forme d’une analyse socio-sémiotique : la réflexion porte à la fois sur les images — photographies et caricatures — et leurs légendes, sur leur agencement dans la page de journal et sur leurs conditions de production. La démarche procède également d’une double comparaison : en diachronie, dans un temps relativement long (de 1949 à 2012, et en synchronie, sur la base d’une confrontation de deux titres de presse quotidienne nationale de « référence », l’un français et l’autre allemand, Le Monde et la Frankfurter Allgemeine Zeitung (FAZ. Une interrogation sur les conditions de possibilité de la présence de l’image dans ces deux périodiques permet d’abord de dégager combien la place de l’imagerie franco-allemande ne va pas de soi, mais résulte d’un processus de longue haleine. Toutefois, malgré défis et obstacles, à la fois techniques et idéologiques, la figure franco-allemande s’impose par le biais de la stabilisation de modèles de représentation qui en font un motif naturel et incontournable. Ainsi, des cadres éditoriaux pérennes favorisent son implantation et sa reconnaissance au quotidien. À l’intérieur de ces cadres, à la surface des images, la figuration de la ressemblance et de la proximité entre les dirigeants français et allemands contribue à forger la

  7. Vers une analyse sémiotique de la théorie des ensembles : hiérarchies et réflexivité

    OpenAIRE

    Herreman, Alain

    2011-01-01

    Cet article est une contribution à l’étude de l’expression de la généralité et de l’abstraction en mathématique. Il propose dans cette perspective une analyse des conditions de possibilité de la réflexivité. Certaines de ces conditions sont d’abord dégagées à partir d’exemples élémentaires. Une brève analyse des Disquistiones arithmeticae de Gauss permet ensuite de proposer un critère de démarcation sémiotique pour les mathématiques ensemblistes. L’application de ce critère permet ensuite d’e...

  8. Conducting a Multivocal Thematic Synthesis on an Extensive Body of Literature | Réaliser une synthèse thématique multivocale d’un vaste ensemble de documentation

    Directory of Open Access Journals (Sweden)

    Madelaine Befus

    2016-04-01

    Full Text Available This paper will provide a methodology and progress report from a multivocal thematic synthesis being conducted on an extensive, diverse body of empirical studies. The study data includes a corpus of peer-reviewed empirical literature sharing a common reference published in English between 2000 and 2014. In this study, data to be synthesized share a common reference to the Garrison, Anderson, and Archer (2000 seminal paper introducing the Community of Inquiry framework, one of the most influential distance and blended learning theories published (Halverson, Graham, Spring, Drysdale, & Henrie, 2013. The study has two deliverables: 1 a multivocal thematic synthesis analysing contexts, populations, learning and teaching environments, and aspects of learning being studying through the lens of the CoI framework; and 2 an online, open, dynamic compendium of all CoI empirical research citing the Garrison et al., 2000, seminal paper. The purpose of the study is two-fold: to bring systematization and organization to a large body of research to support the work of other researchers, practitioners, and policy makers; and to provide an up-to-date methodology framework for creating an online database from large bodies of literature with a common reference. The data used in the thematic synthesis study consisted of full-text copies of peer-reviewed research articles. The data was analysed using an open, constant-comparative, three-stage thematic synthesis methodology. As the procedures used to gather, organize, and archive the data in this study could be applied to any multivocal body of research, the methodological processes was documented in detail to provide a framework for future research and may serve as an exemplar for sharing research data as an open-access resource. Cet article offrira une méthodologie et un rapport sur la progression d’une synthèse thématique multivocale en cours de réalisation sur un vaste ensemble d’études empiriques vari

  9. Certification

    Science.gov (United States)

    Hayhurst, Kelly

    2010-01-01

    Objective 1: Provide regulators with a methodology for development of airworthiness requirements for certification of UAS. a) Rationale: a comprehensive methodology does not currently exist to support development of regulation for certification of UAS. Regulation is essential to enable routine access to the NAS. b) Approach: 1) assess existing approaches and classification schemes for deriving acceptable means of compliance to airworthiness requirements. 2) investigate a service-based approach to classification of UAS. 3) conduct comparative analysis of different methodologies. 4) work with FAA to determine best approach and conduct case study. 5) participate in regulatory/standards organizations developing safety and performance requirements for UAS. Objective 2: Provide regulators and industry with hazard and risk-related data to support criteria for UAS type design. a) Rationale: There is presently little UAS specific data (incident, accident, and reliability), especially in a civil context, to support risk assessment and development of standards and regulation. b) Approach: Identify gaps in existing data, provide measured data as needed, and formulate recommendations by: 1) evaluating UAS incident/accident data collection efforts and determining additional support necessary for regulation. 2) assessing UAS-specific hazards and risks. 3) evaluating need for reliability data for UAS-unique systems, components and subsystem, and determining additional measurement requirements. 4) developing guidance and best practices for UAS type design.

  10. Beuret Jean-Eudes, Anne Cadoret, 2010. Gérer ensemble les territoires, Vers une démocratie participative. Editions Charles Léopold Mayer, Fondation de France. Préface de Francis Charhon, postface de Pierre-Yves Guihéneuf et Loïc Blondiaux, 228 p.

    Directory of Open Access Journals (Sweden)

    Marion Amalric

    2011-06-01

    Full Text Available L’ouvrage de Jean-Eudes Beuret et Anne Cadoret, Gérer ensemble les territoires, Vers une démocratie participative propose un regard à la fois pratique et conceptuel sur les démarches participatives dans le domaine très large de la gestion de l’environnement, de l’aménagement et du développement durable. Il répond à une proposition de la Fondation de France d’analyser dans leur ensemble les quelque 300 projets qui ont été financés dans le cadre de son appel à projet « Ensemble pour gérer le te...

  11. Une formation à distance pour la certification des compétences à l’ère du numérique : le projet C2i Université Laval - Université de Bordeaux

    Directory of Open Access Journals (Sweden)

    Jean-François Lévesque

    2010-01-01

    Full Text Available [Français] Il est désormais devenu indispensable de maîtriser les technologies de l’information et de la communication (TIC pour entreprendre avec succès des études universitaires. Sur ce point, la prise de conscience est de plus en plus forte et la question de la certification des compétences requises à l’ère du numérique devient un enjeu pour les universités. À partir d’un projet pilote mené dans le cadre de la collaboration internationale entre l’Université Laval (Québec et l’Université de Bordeaux (France, nous nous interrogeons dans cet article sur les conditions de mise en place d’une formation à distance en réponse à cette préoccupation. [English] It is now essential to master information and communication technologies (ICT skills to successfully undertake university studies. As there is a growing awareness in this regard, the certification of the skills required in the digital age becomes an issue for universities. Following a pilot project conducted by Laval University (Quebec and by Bordeaux University (France, we examine in this paper the conditions for setting up a distance learning course in response to this concern.

  12. L’ensemble du Main Building au CERN à Genève, Peter Steiger et Rudolf Steiger architectes, Carl Hubacher, Fietz et Hauri ingénieurs, 1954-1960 recommandations pour une réhabilitation

    CERN Document Server

    Wohlschlag, Jérôme; Marino, Giulia

    Les bâtiments qui ont écrit l’histoire de l’architecture moderne vivent une période décisive: souffrant de nombreux maux dus à leurs âges, d’une méconnaissance, et parfois même d’une certaine impopularité, les menaces sont de plus en plus concrètes: d’une transformation normative et inadaptée jusqu’à la démolition. Ces oeuvres représentent un réel patrimoine pour la collectivité, que les effets du temps ont fini par occulter. Le vieillissement et le pragmatisme quotidien transformant l’édifice, les qualités qui l’ont placé au statut qu’on lui a reconnu ne sont presque plus perceptibles. Pourtant, ces édifices recèlent un grand potentiel; pour les maîtres d’ouvrage au bénéfice d’un bien valorisé, exploité et emblématique d’une part; pour la société enrichissant son patrimoine culturel d’autre part; finalement pour les architectes comme moyen de connaissance, source d’inspiration et ressource professionnelle. Le site du CERN à Meyrin, de par son extrater...

  13. Ensemble Methods

    Science.gov (United States)

    Re, Matteo; Valentini, Giorgio

    2012-03-01

    Ensemble methods are statistical and computational learning procedures reminiscent of the human social learning behavior of seeking several opinions before making any crucial decision. The idea of combining the opinions of different "experts" to obtain an overall “ensemble” decision is rooted in our culture at least from the classical age of ancient Greece, and it has been formalized during the Enlightenment with the Condorcet Jury Theorem[45]), which proved that the judgment of a committee is superior to those of individuals, provided the individuals have reasonable competence. Ensembles are sets of learning machines that combine in some way their decisions, or their learning algorithms, or different views of data, or other specific characteristics to obtain more reliable and more accurate predictions in supervised and unsupervised learning problems [48,116]. A simple example is represented by the majority vote ensemble, by which the decisions of different learning machines are combined, and the class that receives the majority of “votes” (i.e., the class predicted by the majority of the learning machines) is the class predicted by the overall ensemble [158]. In the literature, a plethora of terms other than ensembles has been used, such as fusion, combination, aggregation, and committee, to indicate sets of learning machines that work together to solve a machine learning problem [19,40,56,66,99,108,123], but in this chapter we maintain the term ensemble in its widest meaning, in order to include the whole range of combination methods. Nowadays, ensemble methods represent one of the main current research lines in machine learning [48,116], and the interest of the research community on ensemble methods is witnessed by conferences and workshops specifically devoted to ensembles, first of all the multiple classifier systems (MCS) conference organized by Roli, Kittler, Windeatt, and other researchers of this area [14,62,85,149,173]. Several theories have been

  14. NYYD Ensemble

    Index Scriptorium Estoniae

    2002-01-01

    NYYD Ensemble'i duost Traksmann - Lukk E.-S. Tüüri teosega "Symbiosis", mis on salvestatud ka hiljuti ilmunud NYYD Ensemble'i CDle. 2. märtsil Rakvere Teatri väikeses saalis ja 3. märtsil Rotermanni Soolalaos, kavas Tüür, Kaumann, Berio, Reich, Yun, Hauta-aho, Buckinx

  15. Ensembl 2017

    Science.gov (United States)

    Aken, Bronwen L.; Achuthan, Premanand; Akanni, Wasiu; Amode, M. Ridwan; Bernsdorff, Friederike; Bhai, Jyothish; Billis, Konstantinos; Carvalho-Silva, Denise; Cummins, Carla; Clapham, Peter; Gil, Laurent; Girón, Carlos García; Gordon, Leo; Hourlier, Thibaut; Hunt, Sarah E.; Janacek, Sophie H.; Juettemann, Thomas; Keenan, Stephen; Laird, Matthew R.; Lavidas, Ilias; Maurel, Thomas; McLaren, William; Moore, Benjamin; Murphy, Daniel N.; Nag, Rishi; Newman, Victoria; Nuhn, Michael; Ong, Chuang Kee; Parker, Anne; Patricio, Mateus; Riat, Harpreet Singh; Sheppard, Daniel; Sparrow, Helen; Taylor, Kieron; Thormann, Anja; Vullo, Alessandro; Walts, Brandon; Wilder, Steven P.; Zadissa, Amonida; Kostadima, Myrto; Martin, Fergal J.; Muffato, Matthieu; Perry, Emily; Ruffier, Magali; Staines, Daniel M.; Trevanion, Stephen J.; Cunningham, Fiona; Yates, Andrew; Zerbino, Daniel R.; Flicek, Paul

    2017-01-01

    Ensembl (www.ensembl.org) is a database and genome browser for enabling research on vertebrate genomes. We import, analyse, curate and integrate a diverse collection of large-scale reference data to create a more comprehensive view of genome biology than would be possible from any individual dataset. Our extensive data resources include evidence-based gene and regulatory region annotation, genome variation and gene trees. An accompanying suite of tools, infrastructure and programmatic access methods ensure uniform data analysis and distribution for all supported species. Together, these provide a comprehensive solution for large-scale and targeted genomics applications alike. Among many other developments over the past year, we have improved our resources for gene regulation and comparative genomics, and added CRISPR/Cas9 target sites. We released new browser functionality and tools, including improved filtering and prioritization of genome variation, Manhattan plot visualization for linkage disequilibrium and eQTL data, and an ontology search for phenotypes, traits and disease. We have also enhanced data discovery and access with a track hub registry and a selection of new REST end points. All Ensembl data are freely released to the scientific community and our source code is available via the open source Apache 2.0 license. PMID:27899575

  16. Composed ensembles of random unitary ensembles

    CERN Document Server

    Pozniak, M; Kus, M; Pozniak, Marcin; Zyczkowski, Karol; Kus, Marek

    1997-01-01

    Composed ensembles of random unitary matrices are defined via products of matrices, each pertaining to a given canonical circular ensemble of Dyson. We investigate statistical properties of spectra of some composed ensembles and demonstrate their physical relevance. We discuss also the methods of generating random matrices distributed according to invariant Haar measure on the orthogonal and unitary group.

  17. Commande adaptive d'une machine asynchrone

    OpenAIRE

    I. Slama-Belkhodja; De Fornel, B.

    1996-01-01

    Cat article décrit une stratégie de commande adaptive indirecte à Placement de Pôles (PP), appliquée à la commande en vitesse d'une machine asynchrone alimentée par un ensemble hacheur-filtre-onduleur de tension. L'algorithme des Moindres Carrés Récursifs (MCR) est utilisé pour l'identification des modèles de comportement type entrées/sorties. Un intérêt particulier est porté à la mise en oeuvre de cet algorithme et à la discussion de ses résultats, tenant compte des erreurs de modélisation e...

  18. Exploring ensemble visualization

    Science.gov (United States)

    Phadke, Madhura N.; Pinto, Lifford; Alabi, Oluwafemi; Harter, Jonathan; Taylor, Russell M., II; Wu, Xunlei; Petersen, Hannah; Bass, Steffen A.; Healey, Christopher G.

    2012-01-01

    An ensemble is a collection of related datasets. Each dataset, or member, of an ensemble is normally large, multidimensional, and spatio-temporal. Ensembles are used extensively by scientists and mathematicians, for example, by executing a simulation repeatedly with slightly different input parameters and saving the results in an ensemble to see how parameter choices affect the simulation. To draw inferences from an ensemble, scientists need to compare data both within and between ensemble members. We propose two techniques to support ensemble exploration and comparison: a pairwise sequential animation method that visualizes locally neighboring members simultaneously, and a screen door tinting method that visualizes subsets of members using screen space subdivision. We demonstrate the capabilities of both techniques, first using synthetic data, then with simulation data of heavy ion collisions in high-energy physics. Results show that both techniques are capable of supporting meaningful comparisons of ensemble data.

  19. Making Tree Ensembles Interpretable

    OpenAIRE

    Hara, Satoshi; Hayashi, Kohei

    2016-01-01

    Tree ensembles, such as random forest and boosted trees, are renowned for their high prediction performance, whereas their interpretability is critically limited. In this paper, we propose a post processing method that improves the model interpretability of tree ensembles. After learning a complex tree ensembles in a standard way, we approximate it by a simpler model that is interpretable for human. To obtain the simpler model, we derive the EM algorithm minimizing the KL divergence from the ...

  20. Pyrotechnie : une évaluation des risques

    OpenAIRE

    Aufauvre, Lionel; Marlair, Guy; Michot, Christian

    2006-01-01

    Depuis une dizaine d'années, la pyrotechnie tend à se démocratiser, comme en témoigne le développement du marché des artifices de divertissement pour le grand public en France. Elle touche de même l'ensemble de la population dans des applications comme les équipements de sécurité des véhicules automobiles de type airbags ou prétensionneurs de ceinture de sécurité. En effet, ces équipements mettent en oeuvre des matériaux énergétiques adaptés au temps de réaction, extrêmement court, nécessaire...

  1. Philippe Desan, Montaigne. Une biographie politique

    OpenAIRE

    Cavallini, Concetta

    2016-01-01

    Cet imposant volume, Montaigne. Une biographie politique, présente les hypothèses et le résultat des dernières recherches (souvent encore en cours) de Philippe Desan sur l’auteur des Essais. La définition de ‘politique’ permet de placer Montaigne et sa vie dans un contexte social, dans un réseau de connaissances, d’ambitions personnelles, d’ambitions de groupe social: dans l’univers de Montaigne, Philippe Desan inclut l’ensemble hétérogène de la société de la Renaissance, «ordres, clans, fami...

  2. Ensemble Data Mining Methods

    Data.gov (United States)

    National Aeronautics and Space Administration — Ensemble Data Mining Methods, also known as Committee Methods or Model Combiners, are machine learning methods that leverage the power of multiple models to achieve...

  3. Ensemble Data Mining Methods

    Science.gov (United States)

    Oza, Nikunj C.

    2004-01-01

    Ensemble Data Mining Methods, also known as Committee Methods or Model Combiners, are machine learning methods that leverage the power of multiple models to achieve better prediction accuracy than any of the individual models could on their own. The basic goal when designing an ensemble is the same as when establishing a committee of people: each member of the committee should be as competent as possible, but the members should be complementary to one another. If the members are not complementary, Le., if they always agree, then the committee is unnecessary---any one member is sufficient. If the members are complementary, then when one or a few members make an error, the probability is high that the remaining members can correct this error. Research in ensemble methods has largely revolved around designing ensembles consisting of competent yet complementary models.

  4. Extended Ensemble Monte Carlo

    OpenAIRE

    Iba, Yukito

    2000-01-01

    ``Extended Ensemble Monte Carlo''is a generic term that indicates a set of algorithms which are now popular in a variety of fields in physics and statistical information processing. Exchange Monte Carlo (Metropolis-Coupled Chain, Parallel Tempering), Simulated Tempering (Expanded Ensemble Monte Carlo), and Multicanonical Monte Carlo (Adaptive Umbrella Sampling) are typical members of this family. Here we give a cross-disciplinary survey of these algorithms with special emphasis on the great f...

  5. Ensembl variation resources

    Directory of Open Access Journals (Sweden)

    Marin-Garcia Pablo

    2010-05-01

    Full Text Available Abstract Background The maturing field of genomics is rapidly increasing the number of sequenced genomes and producing more information from those previously sequenced. Much of this additional information is variation data derived from sampling multiple individuals of a given species with the goal of discovering new variants and characterising the population frequencies of the variants that are already known. These data have immense value for many studies, including those designed to understand evolution and connect genotype to phenotype. Maximising the utility of the data requires that it be stored in an accessible manner that facilitates the integration of variation data with other genome resources such as gene annotation and comparative genomics. Description The Ensembl project provides comprehensive and integrated variation resources for a wide variety of chordate genomes. This paper provides a detailed description of the sources of data and the methods for creating the Ensembl variation databases. It also explores the utility of the information by explaining the range of query options available, from using interactive web displays, to online data mining tools and connecting directly to the data servers programmatically. It gives a good overview of the variation resources and future plans for expanding the variation data within Ensembl. Conclusions Variation data is an important key to understanding the functional and phenotypic differences between individuals. The development of new sequencing and genotyping technologies is greatly increasing the amount of variation data known for almost all genomes. The Ensembl variation resources are integrated into the Ensembl genome browser and provide a comprehensive way to access this data in the context of a widely used genome bioinformatics system. All Ensembl data is freely available at http://www.ensembl.org and from the public MySQL database server at ensembldb.ensembl.org.

  6. : Une approche marketing

    OpenAIRE

    Ambroise, Laure; Prim-Allaz, Isabelle; Séville, Martine

    2010-01-01

    Au travers d'entretien qualitatifs et d'une étude quantitative, les auteurs cherchent à: -établir les motivations/freins et les attentes des donneurs vis-à-vis du don de sang; -synthétiser les réactions des donneurs vis-à-vis du don de sang, notamment tester leur perception du don et la valeur qu'ils lui attribuent; - identifier des leviers de fidélisation des donneurs et d'augmentation du nombre de dons par donneurs.

  7. Commande adaptive d'une machine asynchrone

    Science.gov (United States)

    Slama-Belkhodja, I.; de Fornel, B.

    1996-06-01

    The paper deals with an indirect self-tuning speed control for an induction motor supplied by a chopper-filter-inverter system. Input/Output models are identified with the recursive least squares algorithm and the controller adaptation is based on a pole assignement strategy. Emphasis is put on the evaluation of the parameter identification in order to avoid instabilities because of disturbances or insufficient excitations. This is especially of importance when the adaptive control is carried out in closed loop systems and without additional test signals. Simulation results show the improvement of the dynamic responses and the robustness against load variations or parameters variations (rotor resistance, inertia). Cat article décrit une stratégie de commande adaptive indirecte à Placement de Pôles (PP), appliquée à la commande en vitesse d'une machine asynchrone alimentée par un ensemble hacheur-filtre-onduleur de tension. L'algorithme des Moindres Carrés Récursifs (MCR) est utilisé pour l'identification des modèles de comportement type entrées/sorties. Un intérêt particulier est porté à la mise en oeuvre de cet algorithme et à la discussion de ses résultats, tenant compte des erreurs de modélisation et de la nature peu riche en excitations des entrées du processus. Différents régimes transitoires ont été simulés pour apprécier l'apport de cette association (MCR-PP) : démarrages et inversion des sens de rotation, à vide et en charges, applications d'échelons de couple résistant, variations paramétriques. Les résultats permettent d'illustrer, tant au niveau des performances que de la robustesse, l'apport d'une telle commande adaptive pour des entraînements électriques avec une machine asynchrone.

  8. La couleur en vision par ordinateur : 1.une revue

    OpenAIRE

    Luong, Quang-Tuan

    1990-01-01

    L'utilisation de la couleur en vision par ordinateur est un sujet de recherche qui suscite un interet recent et croissant. Ce papier fait le point dans ce domaine, en essayant de repondre aux questions : Qu'est-ce que la couleur ? Quelles en sont les representations adequates ? Comment la determiner ? Que peut-on en faire ? Pour cela, nous faisons une revue approfondie et tres a jour de l'ensemble de la litterature consacree a ce sujet en cernant les axes de recherche et les problematiques im...

  9. Une approche affective de la communication organisationnelle : implications épistémologiques et méthodologiques

    OpenAIRE

    2016-01-01

    International audience; La communication organisationnelle est le plus souvent appréhendée dans sa capacité à transmettre un message, une intention, une emprise, mais elle peut également être abordée dans ses effets sur les destinataires. Les slogans, les images, les discours, les interfaces peuvent alors être étudiés non comme des intentions ou des symboles à produire et décoder, mais comme formant une expérience esthétique, comme engendrant un ensemble d'affects et de percepts. Cependant, u...

  10. Milan Kundera, Une rencontre

    OpenAIRE

    Céline Magain

    2012-01-01

     « …rencontre de mes réflexions et de mes souvenirs ; de mes vieux thèmes (existentiels et esthétiques) et mes vieux amours (Rabelais, Janacek, Fellini, Malaparte…) » (p. 9) C’est sur ces mots que le célèbre auteur d’origine tchèque Milan Kundera introduit Une rencontre, son quatrième et dernier essai en français, qui réunit de nouveaux textes et des anciens, réactualisés ou incorporés dans de nouveaux écrits. Comme le titre l’indique, il s’agit bien de rencontre, au sens propre comme au fi...

  11. Milan Kundera, Une rencontre

    Directory of Open Access Journals (Sweden)

    Céline Magain

    2009-10-01

    Full Text Available  « …rencontre de mes réflexions et de mes souvenirs ; de mes vieux thèmes (existentiels et esthétiques et mes vieux amours (Rabelais, Janacek, Fellini, Malaparte… » (p. 9 C’est sur ces mots que le célèbre auteur d’origine tchèque Milan Kundera introduit Une rencontre, son quatrième et dernier essai en français, qui réunit de nouveaux textes et des anciens, réactualisés ou incorporés dans de nouveaux écrits. Comme le titre l’indique, il s’agit bien de rencontre, au sens propre comme au fig...

  12. Neural Network Ensembles

    DEFF Research Database (Denmark)

    Hansen, Lars Kai; Salamon, Peter

    1990-01-01

    We propose several means for improving the performance an training of neural networks for classification. We use crossvalidation as a tool for optimizing network parameters and architecture. We show further that the remaining generalization error can be reduced by invoking ensembles of similar...

  13. Protective Garment Ensemble

    Science.gov (United States)

    Wakefield, M. E.

    1982-01-01

    Protective garment ensemble with internally-mounted environmental- control unit contains its own air supply. Alternatively, a remote-environmental control unit or an air line is attached at the umbilical quick disconnect. Unit uses liquid air that is vaporized to provide both breathing air and cooling. Totally enclosed garment protects against toxic substances.

  14. Une perspective interactionniste

    Directory of Open Access Journals (Sweden)

    Joëlle Morrissette

    2010-02-01

    Full Text Available Cet article vise à montrer l’intérêt de puiser à la sociologie pour conduire des recherches dans le domaine de l’éducation. Plus précisément, il sera question de la contribution d’une perspective interactionniste pour appréhender un objet attaché à l’évaluation des apprentissages des élèves. Comme on le verra, s’inspirer en particulier d’auteurs attachés à la tradition de l’interactionnisme symbolique amène à se situer en marge des manières de dire et de faire habituelles des investigations portant sur cet objet, de la phase de problématisation à celle de l’analyse, au profit d’un point de vue (resocialisant et contextualisant. Pour illustrer le propos, je prendrai appui sur le format d’une recherche ayant documenté le savoir-faire d’un groupe d’enseignantes du primaire en matière d’évaluation formative, et ayant adopté une perspective interactionniste comme posture générale de recherche.An Interactionist PerspectiveAn Alternative Approach to Learning AssessmentThis article aims to show the usefulness of drawing from sociology to conduct research in the field of education. Specifically, it discusses the contribution of an interactionist perspective in understanding the objects attached to student learning assessment. As we shall see, drawing especially from authors working in the tradition of Symbolic Interactionism leads us outside the usual ways of thinking and doing in investigations related to assessment objects, from problematization to analysis, in favour of a (resocializing and contextualizing perspective. To illustrate this point, I will examine the format of a study documenting the expertise of a group of elementary school teachers with regard to formative assessment, and having an interactionist perspective as its basis of research.Una perspectiva interaccionista: otro punto de vista sobre la evaluación del aprendizajeEste artículo tiene como objetivo el demostrar el interés de

  15. Effective Visualization of Temporal Ensembles.

    Science.gov (United States)

    Hao, Lihua; Healey, Christopher G; Bass, Steffen A

    2016-01-01

    An ensemble is a collection of related datasets, called members, built from a series of runs of a simulation or an experiment. Ensembles are large, temporal, multidimensional, and multivariate, making them difficult to analyze. Another important challenge is visualizing ensembles that vary both in space and time. Initial visualization techniques displayed ensembles with a small number of members, or presented an overview of an entire ensemble, but without potentially important details. Recently, researchers have suggested combining these two directions, allowing users to choose subsets of members to visualization. This manual selection process places the burden on the user to identify which members to explore. We first introduce a static ensemble visualization system that automatically helps users locate interesting subsets of members to visualize. We next extend the system to support analysis and visualization of temporal ensembles. We employ 3D shape comparison, cluster tree visualization, and glyph based visualization to represent different levels of detail within an ensemble. This strategy is used to provide two approaches for temporal ensemble analysis: (1) segment based ensemble analysis, to capture important shape transition time-steps, clusters groups of similar members, and identify common shape changes over time across multiple members; and (2) time-step based ensemble analysis, which assumes ensemble members are aligned in time by combining similar shapes at common time-steps. Both approaches enable users to interactively visualize and analyze a temporal ensemble from different perspectives at different levels of detail. We demonstrate our techniques on an ensemble studying matter transition from hadronic gas to quark-gluon plasma during gold-on-gold particle collisions.

  16. Nourrir pour vivre ensemble

    OpenAIRE

    DE VIDAS , Anath Ariel; Hémond, Aline; Hooft, Anuschka van ’t

    2014-01-01

    Manger relève d’une question vitale qui articule les relations sociales et qui « nourrit » auprès des groupes humains nombre de formes culturelles conçues comme spécifiques. Le spectre de la faim et le souci quotidien d’obtenir et de préparer des aliments sont toujours d’actualité dans de nombreuses sociétés (Fischler, 1990) et situent ainsi la nourriture au centre des relations sociales et de certaines formes culturelles de communication, classification, inclusion et exclusion (Douglas, 1966...

  17. Multilevel ensemble Kalman filtering

    KAUST Repository

    Hoel, Hakon

    2016-06-14

    This work embeds a multilevel Monte Carlo sampling strategy into the Monte Carlo step of the ensemble Kalman filter (EnKF) in the setting of finite dimensional signal evolution and noisy discrete-time observations. The signal dynamics is assumed to be governed by a stochastic differential equation (SDE), and a hierarchy of time grids is introduced for multilevel numerical integration of that SDE. The resulting multilevel EnKF is proved to asymptotically outperform EnKF in terms of computational cost versus approximation accuracy. The theoretical results are illustrated numerically.

  18. Les syntagmes nominaux français dans une perspective valentielle

    Directory of Open Access Journals (Sweden)

    Irène Baron

    1994-12-01

    Full Text Available Devant la carence de la grammaire traditionnelle lorsqu'il s'agit de définir la diversité  des liens pouvant  exister au  sein de syntagmes  nominaux  complexes (SN, nous proposons une classification des substantifs français et de leurs expansions, qui vise à une compréhension  d'ensemble de ce type de constructions. A cette fin, les SN seront considérés comme représentant la transposition d'une proposition libre en forme nominale et comme reproduisant à ce titre le schéma distributionnel observable au niveau de la phrase. Nous appliquerons par conséquent, pour les examiner, les règles élaborées en matière de valence verbale.

  19. Critical behavior in topological ensembles

    CERN Document Server

    Bulycheva, K; Nechaev, S

    2014-01-01

    We consider the relation between three physical problems: 2D directed lattice random walks in an external magnetic field, ensembles of torus knots, and 5d Abelian SUSY gauge theory with massless hypermultiplet in $\\Omega$ background. All these systems exhibit the critical behavior typical for the "area+length" statistics of grand ensembles of 2D directed paths. In particular, using the combinatorial description, we have found the new critical behavior in the ensembles of the torus knots and in the instanton ensemble in 5d gauge theory. The relation with the integrable model is discussed.

  20. Wind Power Prediction using Ensembles

    DEFF Research Database (Denmark)

    Giebel, Gregor; Badger, Jake; Landberg, Lars;

    2005-01-01

    The Ensemble project investigated the use of meteorological ensemble fore-casts for the prognosis of uncertainty of the forecasts, and found a good method to make use of ensemble forecasts. This method was then tried based on ensembles from ECMWF in formof a demo application for both the Nysted...... offshore wind farm and the whole Jutland/Funen area. The utilities used these forecasts for maintenance planning, fuel consumption estimates and over-the-weekend trading on the Leipzig power exchange. Othernotable scientific results include the better accuracy of forecasts made up from a simple...

  1. Variations metaboliques des communautes bacteriennes lors d'une pollution par petrole brut, avec ou sans traitement

    OpenAIRE

    Cauchi, B

    1984-01-01

    Les potentialités métaboliques des communautés bactériennes d'une eau de mer polluée par pétrole brut (Arabian Light) et d'une eau de mer polluée et traitée (apport d'une solution nutritive : Inipol EAP 22) ont été étudiées et comparées. De l'analyse des données : droites de régression, classification hiérarchique ascendante même l'augmentation du pool enzymatique (second jour) de l'échantillon bactérien ainsi qu'une homogénéité métabolique d'ensemble à l'inverse des effets de la pollution. L...

  2. No certificate, no chocolate

    CERN Multimedia

    Computer Security Team

    2013-01-01

    Are you already ready to use “certificates” to log into CERN or to connect to the global “eduroam” wireless network? No, I am not talking about your birth certificate, medical certificates or academic certificates. I am referring to “certificates” used for authentication where you would usually use a password.   These digital certificates are a valid alternative to cumbersome passwords. Like the aforementioned personal certificates, a digital certificate is an official document that proves who you are or your qualifications. Your personal digital CERN certificate is tied to your digital identity at CERN. In that respect, a digital certificate is like a password. It is a credential that you must not share with anybody else! With your digital certificate, I can impersonate you and take over your mailbox, your web sessions and more… Digital certificates bind your digital identity to a public/private-key infrastructu...

  3. ESPC Coupled Global Ensemble Design

    Science.gov (United States)

    2014-09-30

    coupled system infrastructure and forecasting capabilities. Initial operational capability is targeted for 2018. APPROACH 1. It is recognized...provided will be the probability distribution function (PDF) of environmental conditions. It is expected that this distribution will have skill. To...system would be the initial capability for ensemble forecasts . Extensions to fully coupled ensembles would be the next step. 2. Develop an extended

  4. On Ensemble Nonlinear Kalman Filtering with Symmetric Analysis Ensembles

    KAUST Repository

    Luo, Xiaodong

    2010-09-19

    The ensemble square root filter (EnSRF) [1, 2, 3, 4] is a popular method for data assimilation in high dimensional systems (e.g., geophysics models). Essentially the EnSRF is a Monte Carlo implementation of the conventional Kalman filter (KF) [5, 6]. It is mainly different from the KF at the prediction steps, where it is some ensembles, rather then the means and covariance matrices, of the system state that are propagated forward. In doing this, the EnSRF is computationally more efficient than the KF, since propagating a covariance matrix forward in high dimensional systems is prohibitively expensive. In addition, the EnSRF is also very convenient in implementation. By propagating the ensembles of the system state, the EnSRF can be directly applied to nonlinear systems without any change in comparison to the assimilation procedures in linear systems. However, by adopting the Monte Carlo method, the EnSRF also incurs certain sampling errors. One way to alleviate this problem is to introduce certain symmetry to the ensembles, which can reduce the sampling errors and spurious modes in evaluation of the means and covariances of the ensembles [7]. In this contribution, we present two methods to produce symmetric ensembles. One is based on the unscented transform [8, 9], which leads to the unscented Kalman filter (UKF) [8, 9] and its variant, the ensemble unscented Kalman filter (EnUKF) [7]. The other is based on Stirling’s interpolation formula (SIF), which results in the divided difference filter (DDF) [10]. Here we propose a simplified divided difference filter (sDDF) in the context of ensemble filtering. The similarity and difference between the sDDF and the EnUKF will be discussed. Numerical experiments will also be conducted to investigate the performance of the sDDF and the EnUKF, and compare them to a well‐established EnSRF, the ensemble transform Kalman filter (ETKF) [2].

  5. Un kyste hydatique osseux: une localisation rare au niveau de l’os iliaque

    Science.gov (United States)

    Nhamoucha, Yassine; Alaoui, Othmane; Doumbia, Aliou; Oukhoya, Mohammed; Abdellaoui, Hicham; Tazi, Mohammed; Chater, Lamyae; Atarraf, Karima; Arroud, Mounir; Afifi, Abderahman

    2016-01-01

    L'hydatidose est une affection parasitaire liée au développement chez l'homme de la forme larvaire d'un cestode, à savoir un tænia de très petite taille dénommé Echinococcus Granulosus. Cette anthropozoonose présente une diversité de formes anatomoradiologiques lié aux nombreux aspects topographiques et évolutifs des kystes. L'hydatidose osseuse est rare, elle ne représente que 0,9 à 2,5% de l'ensemble des localisations. Nous rapportons l'observation d'un enfant de 9 ans, qui a été admis chez nous pour une boiterie fébrile avec une masse au niveau de la fosse iliaque droite, révélant un kyste hydatique au dépend de l'os iliaque. Le bilan lésionnel avait objectivé un kyste hydatique de l'os iliaque avec extension aux parties molles adjacentes. Le traitement chirurgical conclu a un kyste surinfecté d'ou la réalisation d'une exérèse chirurgicale du kyste avec drainage. L'ostéopathie hydatique est infiltrante, diffuse, lente et progressive, ce qui rend le diagnostic tardif et qui compromet la qualité du traitement. PMID:27800081

  6. Software Certification and Software Certificate Management Systems

    Science.gov (United States)

    Denney, Ewen; Fischer, Bernd

    2005-01-01

    Incremental certification and re-certification of code as it is developed and modified is a prerequisite for applying modem, evolutionary development processes, which are especially relevant for NASA. For example, the Columbia Accident Investigation Board (CAIB) report 121 concluded there is "the need for improved and uniform statistical sampling, audit, and certification processes". Also, re-certification time has been a limiting factor in making changes to Space Shuttle code close to launch time. This is likely to be an even bigger problem with the rapid turnaround required in developing NASA s replacement for the Space Shuttle, the Crew Exploration Vehicle (CEV). Hence, intelligent development processes are needed which place certification at the center of development. If certification tools provide useful information, such as estimated time and effort, they are more likely to be adopted. The ultimate impact of such a tool will be reduced effort and increased reliability.

  7. Jeux de rôles pour enfants : une nouvelle forme de fiction ludique

    Directory of Open Access Journals (Sweden)

    Sébastien Kapp

    2011-12-01

    Full Text Available Comment ethnographier la place de la création fictionnelle chez l’enfant ? Nous proposons ici une étude de cas d’une pratique à la croisée du jeu de rôle enfantin spontané et du jeu de rôle grandeur nature pour adulte. Menée sous la forme d’un stage estival, cette activité nous permet de comprendre comment adultes et enfants peuvent ponctuellement participer ensemble à l’écriture d’un récit qui prendra la forme d’un jeu en actes et en paroles. Une des caractéristiques principales de cette forme hybride est que l’enfant est placé dans une position d’auteur, d’acteur et de spectateur. Mais contrairement à ses propres jeux, il est en permanence sous la surveillance et la conduite d’adultes qui supervisent le développement du récit et la conformité des actions par rapport aux règles. Le jeune joueur est donc dans une posture originale : il produit une partie du contenu narratif du jeu dont il n’est pas l’acteur unique (en créant par exemple son personnage. Lui aussi veut raconter une histoire, mettre en place un scénario, créer des règles et faire jouer les adultes, comme dans son jeu enfantin. Mais les règles changent, il n’est plus omnipotent et doit jouer dans des cadres de simulation qu’il contribue à définir.

  8. Pour une anthropologie du cirque

    OpenAIRE

    Fourmaux, Francine

    2005-01-01

    Projet and first results of a study on new circus in France today, trough shows, professionals and leisur or educative practise, considering body, space and territories.; Projet et premiers résultats d'une recherche sur le nouveau cirque aujourd'hui en France, portant sur les professionnels, les spectacles et la pratique amateur, centrée sur le corps dans son rapport à l'espace et aux territoires.

  9. Ensemble manifold regularization.

    Science.gov (United States)

    Geng, Bo; Tao, Dacheng; Xu, Chao; Yang, Linjun; Hua, Xian-Sheng

    2012-06-01

    We propose an automatic approximation of the intrinsic manifold for general semi-supervised learning (SSL) problems. Unfortunately, it is not trivial to define an optimization function to obtain optimal hyperparameters. Usually, cross validation is applied, but it does not necessarily scale up. Other problems derive from the suboptimality incurred by discrete grid search and the overfitting. Therefore, we develop an ensemble manifold regularization (EMR) framework to approximate the intrinsic manifold by combining several initial guesses. Algorithmically, we designed EMR carefully so it 1) learns both the composite manifold and the semi-supervised learner jointly, 2) is fully automatic for learning the intrinsic manifold hyperparameters implicitly, 3) is conditionally optimal for intrinsic manifold approximation under a mild and reasonable assumption, and 4) is scalable for a large number of candidate manifold hyperparameters, from both time and space perspectives. Furthermore, we prove the convergence property of EMR to the deterministic matrix at rate root-n. Extensive experiments over both synthetic and real data sets demonstrate the effectiveness of the proposed framework.

  10. Diurnal Ensemble Surface Meteorology Statistics

    Data.gov (United States)

    U.S. Environmental Protection Agency — Excel file containing diurnal ensemble statistics of 2-m temperature, 2-m mixing ratio and 10-m wind speed. This Excel file contains figures for Figure 2 in the...

  11. Similarity measures for protein ensembles

    DEFF Research Database (Denmark)

    Lindorff-Larsen, Kresten; Ferkinghoff-Borg, Jesper

    2009-01-01

    Analyses of similarities and changes in protein conformation can provide important information regarding protein function and evolution. Many scores, including the commonly used root mean square deviation, have therefore been developed to quantify the similarities of different protein conformations...... a synthetic example from molecular dynamics simulations. We then apply the algorithms to revisit the problem of ensemble averaging during structure determination of proteins, and find that an ensemble refinement method is able to recover the correct distribution of conformations better than standard single...

  12. PSO-Ensemble Demo Application

    DEFF Research Database (Denmark)

    2004-01-01

    Within the framework of the PSO-Ensemble project (FU2101) a demo application has been created. The application use ECMWF ensemble forecasts. Two instances of the application are running; one for Nysted Offshore and one for the total production (except Horns Rev) in the Eltra area. The output is a...... is available via two password-protected web-pages hosted at IMM and is used daily by Elsam and E2....

  13. Application de la systémique à la conception d'un modèle de conduite en mode dégradé d'une centrale nucléaire

    OpenAIRE

    Millerat, Pierre; Chaillot, Mathias; Ermine, Jean-Louis

    1996-01-01

    International audience; Cette publication présente un modèle de conduite d'une centrale nucléaire en mode dégradé fondé sur l'élaboration conjointe de trois modèles. Le premier décrit l'ensemble des phénomènes physiques pertinents pour le pilotage d'une centrale nucléaire, le second l'ensemble des activités de conduite d'un opérateur, le troisième une procédure de conduite en mode dégradé d'une centrale nucléaire. La finalité de ce modèle est d'expliquer à un opérateur cette conduite....

  14. Ma vie sur une puce

    OpenAIRE

    Naessens, Vincent; Decker, Bart,

    2009-01-01

    On a dénombré, ces derniers mois, près de deux millions de déclarations fiscales introduites au moyen de tax-on-web avec, d'ordinaire, la carte d'identité électronique comme sésame. D'ici la fin de l'année, tout Belge devra être muni de ce type de carte d'identité, qui ouvrira la voie à moult possibilités, mais aussi à une kyrielle de dangers.

  15. Estimating preselected and postselected ensembles

    Energy Technology Data Exchange (ETDEWEB)

    Massar, Serge [Laboratoire d' Information Quantique, C.P. 225, Universite libre de Bruxelles (U.L.B.), Av. F. D. Rooselvelt 50, B-1050 Bruxelles (Belgium); Popescu, Sandu [H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL (United Kingdom); Hewlett-Packard Laboratories, Stoke Gifford, Bristol BS12 6QZ (United Kingdom)

    2011-11-15

    In analogy with the usual quantum state-estimation problem, we introduce the problem of state estimation for a pre- and postselected ensemble. The problem has fundamental physical significance since, as argued by Y. Aharonov and collaborators, pre- and postselected ensembles are the most basic quantum ensembles. Two new features are shown to appear: (1) information is flowing to the measuring device both from the past and from the future; (2) because of the postselection, certain measurement outcomes can be forced never to occur. Due to these features, state estimation in such ensembles is dramatically different from the case of ordinary, preselected-only ensembles. We develop a general theoretical framework for studying this problem and illustrate it through several examples. We also prove general theorems establishing that information flowing from the future is closely related to, and in some cases equivalent to, the complex conjugate information flowing from the past. Finally, we illustrate our approach on examples involving covariant measurements on spin-1/2 particles. We emphasize that all state-estimation problems can be extended to the pre- and postselected situation. The present work thus lays the foundations of a much more general theory of quantum state estimation.

  16. Algorithms on ensemble quantum computers.

    Science.gov (United States)

    Boykin, P Oscar; Mor, Tal; Roychowdhury, Vwani; Vatan, Farrokh

    2010-06-01

    In ensemble (or bulk) quantum computation, all computations are performed on an ensemble of computers rather than on a single computer. Measurements of qubits in an individual computer cannot be performed; instead, only expectation values (over the complete ensemble of computers) can be measured. As a result of this limitation on the model of computation, many algorithms cannot be processed directly on such computers, and must be modified, as the common strategy of delaying the measurements usually does not resolve this ensemble-measurement problem. Here we present several new strategies for resolving this problem. Based on these strategies we provide new versions of some of the most important quantum algorithms, versions that are suitable for implementing on ensemble quantum computers, e.g., on liquid NMR quantum computers. These algorithms are Shor's factorization algorithm, Grover's search algorithm (with several marked items), and an algorithm for quantum fault-tolerant computation. The first two algorithms are simply modified using a randomizing and a sorting strategies. For the last algorithm, we develop a classical-quantum hybrid strategy for removing measurements. We use it to present a novel quantum fault-tolerant scheme. More explicitly, we present schemes for fault-tolerant measurement-free implementation of Toffoli and σ(z)(¼) as these operations cannot be implemented "bitwise", and their standard fault-tolerant implementations require measurement.

  17. CME Ensemble Forecasting - A Primer

    Science.gov (United States)

    Pizzo, V. J.; de Koning, C. A.; Cash, M. D.; Millward, G. H.; Biesecker, D. A.; Codrescu, M.; Puga, L.; Odstrcil, D.

    2014-12-01

    SWPC has been evaluating various approaches for ensemble forecasting of Earth-directed CMEs. We have developed the software infrastructure needed to support broad-ranging CME ensemble modeling, including composing, interpreting, and making intelligent use of ensemble simulations. The first step is to determine whether the physics of the interplanetary propagation of CMEs is better described as chaotic (like terrestrial weather) or deterministic (as in tsunami propagation). This is important, since different ensemble strategies are to be pursued under the two scenarios. We present the findings of a comprehensive study of CME ensembles in uniform and structured backgrounds that reveals systematic relationships between input cone parameters and ambient flow states and resulting transit times and velocity/density amplitudes at Earth. These results clearly indicate that the propagation of single CMEs to 1 AU is a deterministic process. Thus, the accuracy with which one can forecast the gross properties (such as arrival time) of CMEs at 1 AU is determined primarily by the accuracy of the inputs. This is no tautology - it means specifically that efforts to improve forecast accuracy should focus upon obtaining better inputs, as opposed to developing better propagation models. In a companion paper (deKoning et al., this conference), we compare in situ solar wind data with forecast events in the SWPC operational archive to show how the qualitative and quantitative findings presented here are entirely consistent with the observations and may lead to improved forecasts of arrival time at Earth.

  18. APPLICATIONS DE JEUX TOPOLOGIQUES A L’ETUDE DE C(X MUNI D’UNE TOPOLOGIE SET-OPEN

    Directory of Open Access Journals (Sweden)

    A.R BOUCHAIR

    2003-12-01

    Full Text Available Dans un espace topologique X, on considère une famille  γ non-vide de compacts de  X. A l’aide de cette famille, nous munissons C(X (l’ensemble des fonctions réelles continues sur X d’une topologie Set-Open. Muni de cette topologie, C(X sera noté . sur X, on définit deux jeux topologiques introduits par R.A. McCoy & I. Ntantu que nous associons à un jeu de Banach-Mazur sur pour donner une condition nécessaire pour que soit faiblement-α-favorable.

  19. L’accès aux ressources d’une formation guidé par des ontologies

    Directory of Open Access Journals (Sweden)

    Dominique Fontaine

    2006-01-01

    Full Text Available Beaucoup de ressources sont mises à contribution pour supporter une formation de type e-learning. L’un des objectifs du projet MEMORAe est de rendre ces ressources plus accessibles aux apprenants. Ce projet propose une approche fondée sur une mémoire organisationnelle de l’ensemble des notions et des ressources de la formation. Un principe est d’indexer ces ressources sur les concepts d’ontologie. Nous décrivons les moyens déployés à cette fin. Nous présentons les scénarios par lesquels les apprenants accèdent aux connaissances en parcourant ces ontologies. Enfin, nous illustrons notre propos à l’aide de deux applications actuellement mises en place en université.

  20. Linking neuronal ensembles by associative synaptic plasticity.

    Directory of Open Access Journals (Sweden)

    Qi Yuan

    Full Text Available Synchronized activity in ensembles of neurons recruited by excitatory afferents is thought to contribute to the coding information in the brain. However, the mechanisms by which neuronal ensembles are generated and modified are not known. Here we show that in rat hippocampal slices associative synaptic plasticity enables ensembles of neurons to change by incorporating neurons belonging to different ensembles. Associative synaptic plasticity redistributes the composition of different ensembles recruited by distinct inputs such as to specifically increase the similarity between the ensembles. These results show that in the hippocampus, the ensemble of neurons recruited by a given afferent projection is fluid and can be rapidly and persistently modified to specifically include neurons from different ensembles. This linking of ensembles may contribute to the formation of associative memories.

  1. A mollified Ensemble Kalman filter

    CERN Document Server

    Bergemann, Kay

    2010-01-01

    It is well recognized that discontinuous analysis increments of sequential data assimilation systems, such as ensemble Kalman filters, might lead to spurious high frequency adjustment processes in the model dynamics. Various methods have been devised to continuously spread out the analysis increments over a fixed time interval centered about analysis time. Among these techniques are nudging and incremental analysis updates (IAU). Here we propose another alternative, which may be viewed as a hybrid of nudging and IAU and which arises naturally from a recently proposed continuous formulation of the ensemble Kalman analysis step. A new slow-fast extension of the popular Lorenz-96 model is introduced to demonstrate the properties of the proposed mollified ensemble Kalman filter.

  2. Excitation energies from ensemble DFT

    Science.gov (United States)

    Borgoo, Alex; Teale, Andy M.; Helgaker, Trygve

    2015-12-01

    We study the evaluation of the Gross-Oliveira-Kohn expression for excitation energies E1-E0=ɛ1-ɛ0+∂E/xc,w[ρ] ∂w | ρ =ρ0. This expression gives the difference between an excitation energy E1 - E0 and the corresponding Kohn-Sham orbital energy difference ɛ1 - ɛ0 as a partial derivative of the exchange-correlation energy of an ensemble of states Exc,w[ρ]. Through Lieb maximisation, on input full-CI density functions, the exchange-correlation energy is evaluated accurately and the partial derivative is evaluated numerically using finite difference. The equality is studied numerically for different geometries of the H2 molecule and different ensemble weights. We explore the adiabatic connection for the ensemble exchange-correlation energy. The latter may prove useful when modelling the unknown weight dependence of the exchange-correlation energy.

  3. Wiktor Stoczkowski, Des hommes, des dieux et des extraterrestres. Ethnologie d’une croyance moderne

    OpenAIRE

    Lepoutre, David

    2006-01-01

    Voici un ouvrage qui nous fait entrer de plain-pied dans une subculture contemporaine généralement perçue comme marginale et qui s’avère pourtant être d’une importance sociale considérable. Il s’agit de l’univers, exotique s’il en est, des parasciences et de la pensée occultiste. Le lecteur curieux y trouvera un ensemble de développements remarquablement bien documentés et ordonnés sur un certain nombre de sujets et de thèmes liés à cette pensée contemporaine dont les ramifications tentaculai...

  4. Traitement des valences verbales dans une grammaire catégorielle du français

    OpenAIRE

    1989-01-01

    Cet article propose de rendre compte dans le cadre d'UCG des phénomènes complexes de la linéarité en français, moyennant deux aménagements : nous postulons en effet que les valences verbales ne sont pas associées a priori à une valeur quelconque pour l'ordre, et qu'elles font partie d'un ensemble plutôt que d'une liste. Le comportement syntaxique des constituants en surface est donc dissocié de l'ordre des valences et régulé par un système de traits similaire à celui de Karttunen (1986) ou d'...

  5. The Partition Ensemble Fallacy Fallacy

    CERN Document Server

    Nemoto, K; Nemoto, Kae; Braunstein, Samuel L.

    2002-01-01

    The Partition Ensemble Fallacy was recently applied to claim no quantum coherence exists in coherent states produced by lasers. We show that this claim relies on an untestable belief of a particular prior distribution of absolute phase. One's choice for the prior distribution for an unobservable quantity is a matter of `religion'. We call this principle the Partition Ensemble Fallacy Fallacy. Further, we show an alternative approach to construct a relative-quantity Hilbert subspace where unobservability of certain quantities is guaranteed by global conservation laws. This approach is applied to coherent states and constructs an approximate relative-phase Hilbert subspace.

  6. Multimodel ensembles of wheat growth

    DEFF Research Database (Denmark)

    Martre, Pierre; Wallach, Daniel; Asseng, Senthold;

    2015-01-01

    Crop models of crop growth are increasingly used to quantify the impact of global changes due to climate or crop management. Therefore, accuracy of simulation results is a major concern. Studies with ensembles of crop models can give valuable information about model accuracy and uncertainty, but ...

  7. Medical Certification System -

    Data.gov (United States)

    Department of Transportation — Provides automated risk-based decision making capability in support of medical certification and clearances processing associated fees and supporting surveillance of...

  8. Global Ensemble Forecast System (GEFS) [1 Deg.

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Global Ensemble Forecast System (GEFS) is a weather forecast model made up of 21 separate forecasts, or ensemble members. The National Centers for Environmental...

  9. ["Agissons Ensemble pour une Vie Meilleure": a program directed to the youth of Francophone Africa].

    Science.gov (United States)

    1993-03-01

    Population education specialists met to reestablish a Pan-African Network for the Promotion of Population Education and to jointly conduct research on improving the quality of life. The specialists came from the Francophone African countries of Benin, Burkina Faso, Cape Verde, the Ivory Coast, Guinea, Madagascar, Mali, Niger, Sao Tome and Principe, Senegal, Togo, Tunisia, and Zaire. Research on a school-related activity aimed at youth is ongoing. This action research aims at the sense of responsibility of urban youth, those in school as well as those out of school. It is based on a distance education strategy. All youth are invited to the viewing of a fiction film entitled North-South Images (eventually accompanied by a documentary film on the environment and/or population) that is offered 3-6 times/year at a cinema in town during out-of-school hours and at public meetings. The cinema session is followed by a forum allowing youth to ask resource persons (a teacher, a development agent, a physician, and a researcher) questions. In-school youth are challenged to deepen their reflection on population and environmental issues by reading a certain number of works (novels, news articles, and essays). The required readings will be followed by a consolidation phase to allow organized debate in the classroom. For the general public, television can broadcast the film and selections from the forum, both of which will be followed by a panel discussion. All youth will be invited to take action based on what they have learned via the TV broadcast (e.g., clean the area in which they live and participate in a reforestation campaign). The best initiatives could earn a prize and TV exposure. The Pan-African Network would assume control of this action research project. Through the framework of existing programs, bilateral and multilateral partners (e.g., UN agencies, Cultural and Technical Cooperation Agency), and nongovernmental organizations could provide the network with films and books of projects.

  10. Squeezing of Collective Excitations in Spin Ensembles

    DEFF Research Database (Denmark)

    Kraglund Andersen, Christian; Mølmer, Klaus

    2012-01-01

    We analyse the possibility to create two-mode spin squeezed states of two separate spin ensembles by inverting the spins in one ensemble and allowing spin exchange between the ensembles via a near resonant cavity field. We investigate the dynamics of the system using a combination of numerical an...

  11. Vers une Didactique de l'Informatique

    OpenAIRE

    Caraballo, Silvina; Cicala, Rosa

    2006-01-01

    Le sujet de cet article est une recherche ayant pour objet l'étude de la Didactique de l'Informatique. En partant d'une brève description de la place qu'occupe actuellement l'informatique dans l'enseignement secondaire, nous exposons quelques conditions nécessaires pour réaliser une analyse épistémologique et didactique des contenus qui devraient être enseignés. Notre analyse se limite aux établissements secondaires publics de la Province de Buenos Aires.D'abord, nous envisageons l'analyse ép...

  12. Classical and Quantum Ensembles via Multiresolution. II. Wigner Ensembles

    OpenAIRE

    2004-01-01

    We present the application of the variational-wavelet analysis to the analysis of quantum ensembles in Wigner framework. (Naive) deformation quantization, the multiresolution representations and the variational approach are the key points. We construct the solutions of Wigner-like equations via the multiscale expansions in the generalized coherent states or high-localized nonlinear eigenmodes in the base of the compactly supported wavelets and the wavelet packets. We demonstrate the appearanc...

  13. Hydrological Ensemble Prediction System (HEPS)

    Science.gov (United States)

    Thielen-Del Pozo, J.; Schaake, J.; Martin, E.; Pailleux, J.; Pappenberger, F.

    2010-09-01

    Flood forecasting systems form a key part of ‘preparedness' strategies for disastrous floods and provide hydrological services, civil protection authorities and the public with information of upcoming events. Provided the warning leadtime is sufficiently long, adequate preparatory actions can be taken to efficiently reduce the impacts of the flooding. Following on the success of the use of ensembles for weather forecasting, the hydrological community now moves increasingly towards Hydrological Ensemble Prediction Systems (HEPS) for improved flood forecasting using operationally available NWP products as inputs. However, these products are often generated on relatively coarse scales compared to hydrologically relevant basin units and suffer systematic biases that may have considerable impact when passed through the non-linear hydrological filters. Therefore, a better understanding on how best to produce, communicate and use hydrologic ensemble forecasts in hydrological short-, medium- und long term prediction of hydrological processes is necessary. The "Hydrologic Ensemble Prediction Experiment" (HEPEX), is an international initiative consisting of hydrologists, meteorologist and end-users to advance probabilistic hydrologic forecast techniques for flood, drought and water management applications. Different aspects of the hydrological ensemble processor are being addressed including • Production of useful meteorological products relevant for hydrological applications, ranging from nowcasting products to seasonal forecasts. The importance of hindcasts that are consistent with the operational weather forecasts will be discussed to support bias correction and downscaling, statistically meaningful verification of HEPS, and the development and testing of operating rules; • Need for downscaling and post-processing of weather ensembles to reduce bias before entering hydrological applications; • Hydrological model and parameter uncertainty and how to correct and

  14. La crise du vivre-ensemble

    DEFF Research Database (Denmark)

    Schultz, Nils Voisin

    2014-01-01

    chance pour la France à condition que le dialogue interculturel soit renforcé et que l’idée d’une culture française y garde sa place, elle reste pour Millet une impossibilité. L’enjeu de l’analyse est de dévoiler la capacité des discours à générer par l’affectivité une peur capable d’intensifier l...

  15. Certification Programs for Citrus

    Science.gov (United States)

    Citrus certification programs designed to ensure that healthy plants of the highest genetic potential are being planted in the field are the basic building block of an integrated pest management program. Certification programs began for citrus began with the discovery that the diseases were graft t...

  16. Soy production and certification

    DEFF Research Database (Denmark)

    Tomei, Julia; Semino, Stella Maris; Paul, Helena

    2010-01-01

    With the rising emphasis on biofuels as a potential solution to climate change, this paper asks whether certification schemes, developed to promote sustainable feedstock production, are able to deliver genuine sustainability benefits. The Round Table on Responsible Soy (RTRS) is a certification s...

  17. Converse Barrier Certificate Theorems

    DEFF Research Database (Denmark)

    Wisniewski, Rafael; Sloth, Christoffer

    2016-01-01

    This paper shows that a barrier certificate exists for any safe dynamical system. Specifically, we prove converse barrier certificate theorems for a class of structurally stable dynamical systems. Other authors have developed a related result by assuming that the dynamical system has neither sing...

  18. Symanzik flow on HISQ ensembles

    CERN Document Server

    Bazavov, A; Brown, N; DeTar, C; Foley, J; Gottlieb, Steven; Heller, U M; Hetrick, J E; Laiho, J; Levkova, L; Oktay, M; Sugar, R L; Toussaint, D; Van de Water, R S; Zhou, R

    2013-01-01

    We report on a scale determination with gradient-flow techniques on the $N_f = 2 + 1 + 1$ HISQ ensembles generated by the MILC collaboration. The lattice scale $w_0/a$, originally proposed by the BMW collaboration, is computed using Symanzik flow at four lattice spacings ranging from 0.15 to 0.06 fm. With a Taylor series ansatz, the results are simultaneously extrapolated to the continuum and interpolated to physical quark masses. We give a preliminary determination of the scale $w_0$ in physical units, along with associated systematic errors, and compare with results from other groups. We also present a first estimate of autocorrelation lengths as a function of flowtime for these ensembles.

  19. Spectral diagonal ensemble Kalman filters

    CERN Document Server

    Kasanický, Ivan; Vejmelka, Martin

    2015-01-01

    A new type of ensemble Kalman filter is developed, which is based on replacing the sample covariance in the analysis step by its diagonal in a spectral basis. It is proved that this technique improves the aproximation of the covariance when the covariance itself is diagonal in the spectral basis, as is the case, e.g., for a second-order stationary random field and the Fourier basis. The method is extended by wavelets to the case when the state variables are random fields, which are not spatially homogeneous. Efficient implementations by the fast Fourier transform (FFT) and discrete wavelet transform (DWT) are presented for several types of observations, including high-dimensional data given on a part of the domain, such as radar and satellite images. Computational experiments confirm that the method performs well on the Lorenz 96 problem and the shallow water equations with very small ensembles and over multiple analysis cycles.

  20. Statistical Analysis of Protein Ensembles

    Science.gov (United States)

    Máté, Gabriell; Heermann, Dieter

    2014-04-01

    As 3D protein-configuration data is piling up, there is an ever-increasing need for well-defined, mathematically rigorous analysis approaches, especially that the vast majority of the currently available methods rely heavily on heuristics. We propose an analysis framework which stems from topology, the field of mathematics which studies properties preserved under continuous deformations. First, we calculate a barcode representation of the molecules employing computational topology algorithms. Bars in this barcode represent different topological features. Molecules are compared through their barcodes by statistically determining the difference in the set of their topological features. As a proof-of-principle application, we analyze a dataset compiled of ensembles of different proteins, obtained from the Ensemble Protein Database. We demonstrate that our approach correctly detects the different protein groupings.

  1. Statistical Analysis of Protein Ensembles

    Directory of Open Access Journals (Sweden)

    Gabriell eMáté

    2014-04-01

    Full Text Available As 3D protein-configuration data is piling up, there is an ever-increasing need for well-defined, mathematically rigorous analysis approaches, especially that the vast majority of the currently available methods rely heavily on heuristics. We propose an analysis framework which stems from topology, the field of mathematics which studies properties preserved under continuous deformations. First, we calculate a barcode representation of the molecules employing computational topology algorithms. Bars in this barcode represent different topological features. Molecules are compared through their barcodes by statistically determining the difference in the set of their topological features. As a proof-of-principle application, we analyze a dataset compiled of ensembles of different proteins, obtained from the Ensemble Protein Database. We demonstrate that our approach correctly detects the different protein groupings.

  2. Comparaison de populations de carpe commune (Cyprinus carpio à taille commerciale : intérêt d'une approche globale

    Directory of Open Access Journals (Sweden)

    PEREIRA V.

    1999-07-01

    Une discrimination géographique des populations est possible mais elle repose sur une approche globale intégrant l'ensemble des paramètres. Les différences semblent essentiellement liées aux conditions environnementales et permettent de distinguer les lots issus des régions où l'élevage est plus intensif et traditionnellement centré sur la carpe (Dombes, Forez, Lorraine et les lots correspondant à un élevage plus extensif et davantage orienté vers le marché du repeuplement (Allier, Brenne, Poitou-Charentes.

  3. Mertens André, Une aventure urbanistique

    Directory of Open Access Journals (Sweden)

    Xavier Leloup

    2011-03-01

    Full Text Available L’objectif de l’ouvrage est de produire un effort de réflexion et de synthèse en vue de conserver les acquis d’une expérience “atypique”, celle de Louvain-la-Neuve, rare exemple de création d’une ville nouvelle par une autorité d’enseignement privé (l’Uni­versité catholique de Louvain, construite en réaction à des événements politiques particuliers. L’intention était de créer un environnement propice à une université en évitant de l’isoler du reste de la société. Il fallait aussi mettre à di...

  4. 49 CFR 583.13 - Supplier certification and certificates.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 7 2010-10-01 2010-10-01 false Supplier certification and certificates. 583.13... § 583.13 Supplier certification and certificates. Each supplier shall certify the information on each... supplier in any mode (e.g., paper, electronic) provided the mode contains all information in...

  5. Notes et Solutions de Quelques Exercices du Livre: Th\\'eorie des Ensembles de N. Bourbaki

    OpenAIRE

    Darkaoui, Mohssin Zarouali

    2011-01-01

    These notes provide an opportunity to discover the beauty of Bourbaki set theory, and I hope that they will facilitate the task to those who find it difficult to read this book, one of the most critical elements of the mathematics of Bourbaki. ---- Ces notes constituent une occasion pour d\\'ecouvrir la beaut\\'e de la th\\'eorie des ensembles de Bourbaki, et j'esp\\`ere qu'elles faciliteront la t\\^ache \\`a ceux qui ont trouv\\'e des difficult\\'es en lisant ce livre qui est l'un des plus critiqu\\'...

  6. Notes et Solutions de Quelques Exercices du Livre: Th\\'eorie des Ensembles de N. Bourbaki

    CERN Document Server

    Darkaoui, Mohssin Zarouali

    2011-01-01

    These notes provide an opportunity to discover the beauty of Bourbaki set theory, and I hope that they will facilitate the task to those who find it difficult to read this book, one of the most critical elements of the mathematics of Bourbaki. ---- Ces notes constituent une occasion pour d\\'ecouvrir la beaut\\'e de la th\\'eorie des ensembles de Bourbaki, et j'esp\\`ere qu'elles faciliteront la t\\^ache \\`a ceux qui ont trouv\\'e des difficult\\'es en lisant ce livre qui est l'un des plus critiqu\\'e des \\'el\\'ements de math\\'ematique de Bourbaki.

  7. Classical and Quantum Ensembles via Multiresolution. II. Wigner Ensembles

    CERN Document Server

    Fedorova, A N; Fedorova, Antonina N.; Zeitlin, Michael G.

    2004-01-01

    We present the application of the variational-wavelet analysis to the analysis of quantum ensembles in Wigner framework. (Naive) deformation quantization, the multiresolution representations and the variational approach are the key points. We construct the solutions of Wigner-like equations via the multiscale expansions in the generalized coherent states or high-localized nonlinear eigenmodes in the base of the compactly supported wavelets and the wavelet packets. We demonstrate the appearance of (stable) localized patterns (waveletons) and consider entanglement and decoherence as possible applications.

  8. Une typologie archétypale des intentions discursives pour la mythanalyse

    Directory of Open Access Journals (Sweden)

    Andrés Dávila

    2014-12-01

    Full Text Available Traditionnellement, les analyses de discours se concentrent sur la description des structures et des réseaux socio-sémantiques grâce, entre autres techniques, à l'utilisation d'outils de statistiques textuelles. Dans cet article, nous proposons une démarche alternative qui positionne l'analyse en amont du discours et qui privilégie les éléments constitutifs d’un mythe comme une construction discursive. Se concentrer sur l'intention discursive permet d’appréhender différemment l’étude du discours portée par un mythe en rendant possible le déchiffrement de ses antécédents. Notre démarche vise à réaliser une typologie archétypale des intentions discursives pouvant expliquer l’origine des mythes. L'intention exprimée se réfère à un système de connaissances et de valeurs et vise à satisfaire des besoins précis. La typologie archétypale des intentions discursives émerge de l'ensemble des combinaisons possibles de trois types de connaissances – empiriques, scientifiques et intuitives – de trois types de valeurs – individuelles, contextuelles et universelles – et de trois types de besoins – physiques, sociaux et transcendantaux. Un discours/mythe n’est pas restreint à un seul archétype de la typologie proposée, il est le résultat d’une prioritisation de différents types de besoins, de connaissances, et des valeurs dans une combinaison unique et individuelle. Une telle typologie permettrait non seulement la description des intentions discursives constitutives des mythes mais aussi l'examen des tendances dominantes au sein d'une organisation ou d'un corps de métier, ou dans la société. Ce modèle est actuellement utilisé pour apparier des personnes indécises quant à leur orientation professionnelle à des métiers, sur la base d'un inventaire des intentions discursives déclarées.

  9. Employment certificates on HRT

    CERN Multimedia

    HR Department

    2008-01-01

    As part of the ongoing drive to simplify and streamline administrative procedures and processes, the IT and HR Departments have made employment certificates available on a self-service basis on the HRT application, in the main menu under "My self services". All members of the personnel can thus obtain a certificate of employment or association, in French or in English, for the present or past contractual period. The HR Department’s Records Office remains responsible for issuing any special certificates that might be required. IT-AIS (Administrative Information Services) HR-SPS (Services, Procedures & Social) Records Office – Tel. 73700

  10. Indirect Air Carrier Certification

    Data.gov (United States)

    Department of Homeland Security — Required information is entered in order to obtain an IAC certification and do business as an IAC. Information is verified through site inspections and inspections...

  11. Quantum Repeaters and Atomic Ensembles

    DEFF Research Database (Denmark)

    Borregaard, Johannes

    a previous protocol, thereby enabling fast local processing, which greatly enhances the distribution rate. We then move on to describe our work on improving the stability of atomic clocks using entanglement. Entanglement can potentially push the stability of atomic clocks to the so-called Heisenberg limit......, which is the absolute upper limit of the stability allowed by the Heisenberg uncertainty relation. It has, however, been unclear whether entangled state’s enhanced sensitivity to noise would prevent reaching this limit. We have developed an adaptive measurement protocol, which circumvents this problem...... based on atomic ensembles....

  12. A Localized Ensemble Kalman Smoother

    Science.gov (United States)

    Butala, Mark D.

    2012-01-01

    Numerous geophysical inverse problems prove difficult because the available measurements are indirectly related to the underlying unknown dynamic state and the physics governing the system may involve imperfect models or unobserved parameters. Data assimilation addresses these difficulties by combining the measurements and physical knowledge. The main challenge in such problems usually involves their high dimensionality and the standard statistical methods prove computationally intractable. This paper develops and addresses the theoretical convergence of a new high-dimensional Monte-Carlo approach called the localized ensemble Kalman smoother.

  13. Ensemble Methods Foundations and Algorithms

    CERN Document Server

    Zhou, Zhi-Hua

    2012-01-01

    An up-to-date, self-contained introduction to a state-of-the-art machine learning approach, Ensemble Methods: Foundations and Algorithms shows how these accurate methods are used in real-world tasks. It gives you the necessary groundwork to carry out further research in this evolving field. After presenting background and terminology, the book covers the main algorithms and theories, including Boosting, Bagging, Random Forest, averaging and voting schemes, the Stacking method, mixture of experts, and diversity measures. It also discusses multiclass extension, noise tolerance, error-ambiguity a

  14. Gibbs Ensembles of Nonintersecting Paths

    CERN Document Server

    Borodin, Alexei

    2008-01-01

    We consider a family of determinantal random point processes on the two-dimensional lattice and prove that members of our family can be interpreted as a kind of Gibbs ensembles of nonintersecting paths. Examples include probability measures on lozenge and domino tilings of the plane, some of which are non-translation-invariant. The correlation kernels of our processes can be viewed as extensions of the discrete sine kernel, and we show that the Gibbs property is a consequence of simple linear relations satisfied by these kernels. The processes depend on infinitely many parameters, which are closely related to parametrization of totally positive Toeplitz matrices.

  15. Measuring social interaction in music ensembles.

    Science.gov (United States)

    Volpe, Gualtiero; D'Ausilio, Alessandro; Badino, Leonardo; Camurri, Antonio; Fadiga, Luciano

    2016-05-05

    Music ensembles are an ideal test-bed for quantitative analysis of social interaction. Music is an inherently social activity, and music ensembles offer a broad variety of scenarios which are particularly suitable for investigation. Small ensembles, such as string quartets, are deemed a significant example of self-managed teams, where all musicians contribute equally to a task. In bigger ensembles, such as orchestras, the relationship between a leader (the conductor) and a group of followers (the musicians) clearly emerges. This paper presents an overview of recent research on social interaction in music ensembles with a particular focus on (i) studies from cognitive neuroscience; and (ii) studies adopting a computational approach for carrying out automatic quantitative analysis of ensemble music performances.

  16. Analysis of mesoscale forecasts using ensemble methods

    CERN Document Server

    Gross, Markus

    2016-01-01

    Mesoscale forecasts are now routinely performed as elements of operational forecasts and their outputs do appear convincing. However, despite their realistic appearance at times the comparison to observations is less favorable. At the grid scale these forecasts often do not compare well with observations. This is partly due to the chaotic system underlying the weather. Another key problem is that it is impossible to evaluate the risk of making decisions based on these forecasts because they do not provide a measure of confidence. Ensembles provide this information in the ensemble spread and quartiles. However, running global ensembles at the meso or sub mesoscale involves substantial computational resources. National centers do run such ensembles, but the subject of this publication is a method which requires significantly less computation. The ensemble enhanced mesoscale system presented here aims not at the creation of an improved mesoscale forecast model. Also it is not to create an improved ensemble syste...

  17. Interpreting Tree Ensembles with inTrees

    OpenAIRE

    Deng, Houtao

    2014-01-01

    Tree ensembles such as random forests and boosted trees are accurate but difficult to understand, debug and deploy. In this work, we provide the inTrees (interpretable trees) framework that extracts, measures, prunes and selects rules from a tree ensemble, and calculates frequent variable interactions. An rule-based learner, referred to as the simplified tree ensemble learner (STEL), can also be formed and used for future prediction. The inTrees framework can applied to both classification an...

  18. Analysis of peeling decoder for MET ensembles

    CERN Document Server

    Hinton, Ryan

    2009-01-01

    The peeling decoder introduced by Luby, et al. allows analysis of LDPC decoding for the binary erasure channel (BEC). For irregular ensembles, they analyze the decoder state as a Markov process and present a solution to the differential equations describing the process mean. Multi-edge type (MET) ensembles allow greater precision through specifying graph connectivity. We generalize the the peeling decoder for MET ensembles and derive analogous differential equations. We offer a new change of variables and solution to the node fraction evolutions in the general (MET) case. This result is preparatory to investigating finite-length ensemble behavior.

  19. Hierarchical Bayes Ensemble Kalman Filtering

    CERN Document Server

    Tsyrulnikov, Michael

    2015-01-01

    Ensemble Kalman filtering (EnKF), when applied to high-dimensional systems, suffers from an inevitably small affordable ensemble size, which results in poor estimates of the background error covariance matrix ${\\bf B}$. The common remedy is a kind of regularization, usually an ad-hoc spatial covariance localization (tapering) combined with artificial covariance inflation. Instead of using an ad-hoc regularization, we adopt the idea by Myrseth and Omre (2010) and explicitly admit that the ${\\bf B}$ matrix is unknown and random and estimate it along with the state (${\\bf x}$) in an optimal hierarchical Bayes analysis scheme. We separate forecast errors into predictability errors (i.e. forecast errors due to uncertainties in the initial data) and model errors (forecast errors due to imperfections in the forecast model) and include the two respective components ${\\bf P}$ and ${\\bf Q}$ of the ${\\bf B}$ matrix into the extended control vector $({\\bf x},{\\bf P},{\\bf Q})$. Similarly, we break the traditional backgrou...

  20. Visualizing ensembles in structural biology.

    Science.gov (United States)

    Melvin, Ryan L; Salsbury, Freddie R

    2016-06-01

    Displaying a single representative conformation of a biopolymer rather than an ensemble of states mistakenly conveys a static nature rather than the actual dynamic personality of biopolymers. However, there are few apparent options due to the fixed nature of print media. Here we suggest a standardized methodology for visually indicating the distribution width, standard deviation and uncertainty of ensembles of states with little loss of the visual simplicity of displaying a single representative conformation. Of particular note is that the visualization method employed clearly distinguishes between isotropic and anisotropic motion of polymer subunits. We also apply this method to ligand binding, suggesting a way to indicate the expected error in many high throughput docking programs when visualizing the structural spread of the output. We provide several examples in the context of nucleic acids and proteins with particular insights gained via this method. Such examples include investigating a therapeutic polymer of FdUMP (5-fluoro-2-deoxyuridine-5-O-monophosphate) - a topoisomerase-1 (Top1), apoptosis-inducing poison - and nucleotide-binding proteins responsible for ATP hydrolysis from Bacillus subtilis. We also discuss how these methods can be extended to any macromolecular data set with an underlying distribution, including experimental data such as NMR structures.

  1. Faire territoire au quotidien dans les grands ensembles HLM

    Directory of Open Access Journals (Sweden)

    Denis la Mache

    2012-05-01

    Full Text Available Cet article propose une lecture anthropologique de la manière dont les habitants des grands ensembles de périphéries urbaines délimitent, administrent, transforment matériellement et symboliquement les espaces et les lieux de leur quotidien pour faire territoire. Nous nous intéresserons à la fabrication de ces entités spatiales dont chaque individu se donne la liberté de disposer chaque jour selon un usage singulier et qu’il entoure d’un champ symbolique spécifique, garant d’identité. Ces « fabrications sociospatiales » seront abordées à partir d’une recherche empirique menée auprès d’habitants de deux terrains d’enquêtes situés dans des périphéries de villes moyennes.This paper proposes an anthropological reading of how the inhabitants of large urban peripheries define, administer, and process their daily spaces and places from a material as much as symbolical point of view to give sense to their territory. We will focus on the making of these spatial entities, witch everyone can dispose of everyday individually, to guarantee their identity. These “socio spatial creations” will be based on an empirical research, that is to say surveys conducted among the suburbians of two towns.

  2. Pour une Écologie des Somatiques?

    Directory of Open Access Journals (Sweden)

    Isabelle

    2014-12-01

    Full Text Available Ce texte traite de la parenté conceptuelle et théorique entre Somatiques et Écologie scientifique. Après une définition de la notion scientifique d’écologie, il s’attache à définir trois notions clés de l’écologie: celle de potentiel, qui permet de décrire de façon innovante le modèle de relation entre sujet et environnement au sein des Somatiques, et celles de diversité et de réciprocité, à partir desquelles l’article se veut une invitation et un programme à penser l’intégration des Somatiques au paradigme écologique scientifique, et en appelle aux acteurs somatiques pour transformer leurs pratiques selon une éthique environnementale.

  3. Une banque de données en développement sur la mécanisation de la France

    OpenAIRE

    Benoit, Serge; Emptoz, Gérard; Fontanon, Claudine

    2009-01-01

    Dans le processus d'ensemble de la première industrialisation, la mécanisation occupe une place centrale : extension dans la sphère de la production, sur une échelle sans précédent et avec une tendance à la généralisation, du machinisme comme remplacement du travail manuel ; utilisation sans cesse croissante, à cette fin, d'énergie mécanique inanimée accompagnée d'un renouvellement des sources de celle-ci ; application au secteur des transports de la motorisation auparavant limitée aux activi...

  4. Comment gouverner une population invisible ?

    OpenAIRE

    2014-01-01

    S’inspirant des recherches sur les liens entre composition socioéconomique des villes et formes localisées de régulation politique, cet article analyse une ville caractérisée par la présence de structures militaires d’envergure, Toulon, et la population militaire qui y travaille et réside. Il montre les relations entre une population urbaine (et un groupe professionnel), ses formes d’organisation et d’expression d’intérêts, et son influence sur la sphère politique et les politiques publiques ...

  5. ENVIRONMENTAL MANAGEMENT SYSTEMS CERTIFICATION

    Directory of Open Access Journals (Sweden)

    Aniko Miler-Virc

    2012-12-01

    Full Text Available ISO 14001 prescribes the requirements for a system, not environmental performance itself. Similarly, certification is of the management system itself, not environmental performance. An audit is not conducted to ascertain whether your flue gas emissions are less than X part per million nitrous oxide or that your wastewater effluent contains less that Y milligrams of bacteria per litre. Consequently, the procces of auditing the system for compliance to the standard entails checking to see that all of the necessary components of a functioning system are present and working properly.           A company can have a complete and fully functional EMS as prescribed by ISO 14001 without being certified. As certification can add to the time and expense of EMS development, it is important for you to establish, in advance, whether certification is of net benefit to you. Although most companies that develop an EMS do in fact certify, there are cases where certification does not add immediate value. Certification is not always beneficial to small and medium sized companies. Certification is not always necessary for companies with one or two large clients with environmental demands who are satisfied that you have a functional EMS (second-party declaration. Whatever decision you make, it is important to remember that just as a driver′s licence does not automatically make you a good driver, ISO 14001 certification does not automatically make your company environmentally benign or ensure that you will continually improve environmental performance. The system is only as good as the people who operate it.

  6. G. Barruol (ss dir.), Le mont Ventoux, encyclopédie d’une montagne provençale

    OpenAIRE

    Joannon, Michèle

    2007-01-01

    L’ouvrage, un numéro double (n° 155-156) de la revue Les Alpes de Lumière, publié en juillet 2007, reprend la formule utilisée en 2004 pour le numéro 145-146 de la même revue et consacré à la montagne de Lure, c’est-à-dire à l’extrémité orientale de cette grande unité structurale et paysagère qu’est l’ensemble Ventoux-Lure. Après une belle introduction, l’ouvrage obéit au même souci de précision et d’exhaustivité que le volume sur Lure : il rassemble une cinquantaine de spécialistes, qui sur ...

  7. Layered Ensemble Architecture for Time Series Forecasting.

    Science.gov (United States)

    Rahman, Md Mustafizur; Islam, Md Monirul; Murase, Kazuyuki; Yao, Xin

    2016-01-01

    Time series forecasting (TSF) has been widely used in many application areas such as science, engineering, and finance. The phenomena generating time series are usually unknown and information available for forecasting is only limited to the past values of the series. It is, therefore, necessary to use an appropriate number of past values, termed lag, for forecasting. This paper proposes a layered ensemble architecture (LEA) for TSF problems. Our LEA consists of two layers, each of which uses an ensemble of multilayer perceptron (MLP) networks. While the first ensemble layer tries to find an appropriate lag, the second ensemble layer employs the obtained lag for forecasting. Unlike most previous work on TSF, the proposed architecture considers both accuracy and diversity of the individual networks in constructing an ensemble. LEA trains different networks in the ensemble by using different training sets with an aim of maintaining diversity among the networks. However, it uses the appropriate lag and combines the best trained networks to construct the ensemble. This indicates LEAs emphasis on accuracy of the networks. The proposed architecture has been tested extensively on time series data of neural network (NN)3 and NN5 competitions. It has also been tested on several standard benchmark time series data. In terms of forecasting accuracy, our experimental results have revealed clearly that LEA is better than other ensemble and nonensemble methods.

  8. Ensemble methods for handwritten digit recognition

    DEFF Research Database (Denmark)

    Hansen, Lars Kai; Liisberg, Christian; Salamon, P.

    1992-01-01

    . It is further shown that it is possible to estimate the ensemble performance as well as the learning curve on a medium-size database. In addition the authors present preliminary analysis of experiments on a large database and show that state-of-the-art performance can be obtained using the ensemble approach...

  9. Perception of ensemble statistics requires attention.

    Science.gov (United States)

    Jackson-Nielsen, Molly; Cohen, Michael A; Pitts, Michael A

    2017-02-01

    To overcome inherent limitations in perceptual bandwidth, many aspects of the visual world are represented as summary statistics (e.g., average size, orientation, or density of objects). Here, we investigated the relationship between summary (ensemble) statistics and visual attention. Recently, it was claimed that one ensemble statistic in particular, color diversity, can be perceived without focal attention. However, a broader debate exists over the attentional requirements of conscious perception, and it is possible that some form of attention is necessary for ensemble perception. To test this idea, we employed a modified inattentional blindness paradigm and found that multiple types of summary statistics (color and size) often go unnoticed without attention. In addition, we found attentional costs in dual-task situations, further implicating a role for attention in statistical perception. Overall, we conclude that while visual ensembles may be processed efficiently, some amount of attention is necessary for conscious perception of ensemble statistics.

  10. Popular Ensemble Methods: An Empirical Study

    CERN Document Server

    Maclin, R; 10.1613/jair.614

    2011-01-01

    An ensemble consists of a set of individually trained classifiers (such as neural networks or decision trees) whose predictions are combined when classifying novel instances. Previous research has shown that an ensemble is often more accurate than any of the single classifiers in the ensemble. Bagging (Breiman, 1996c) and Boosting (Freund and Shapire, 1996; Shapire, 1990) are two relatively new but popular methods for producing ensembles. In this paper we evaluate these methods on 23 data sets using both neural networks and decision trees as our classification algorithm. Our results clearly indicate a number of conclusions. First, while Bagging is almost always more accurate than a single classifier, it is sometimes much less accurate than Boosting. On the other hand, Boosting can create ensembles that are less accurate than a single classifier -- especially when using neural networks. Analysis indicates that the performance of the Boosting methods is dependent on the characteristics of the data set being exa...

  11. Rehabilitation Counselor Certification: Moving Forward

    Science.gov (United States)

    Saunders, Jodi L.; Barros-Bailey, Mary; Chapman, Cindy; Nunez, Patricia

    2009-01-01

    This article provides a brief history of the Commission on Rehabilitation Counselor Certification and presents recent changes and strategic goals for moving forward. Challenges and opportunities for the profession in relation to certification are also discussed. (Contains 3 tables.)

  12. Generation of scenarios from calibrated ensemble forecasts with a dynamic ensemble copula coupling approach

    CERN Document Server

    Bouallegue, Zied Ben; Theis, Susanne E; Pinson, Pierre

    2015-01-01

    Probabilistic forecasts in the form of ensemble of scenarios are required for complex decision making processes. Ensemble forecasting systems provide such products but the spatio-temporal structures of the forecast uncertainty is lost when statistical calibration of the ensemble forecasts is applied for each lead time and location independently. Non-parametric approaches allow the reconstruction of spatio-temporal joint probability distributions at a low computational cost.For example, the ensemble copula coupling (ECC) method consists in rebuilding the multivariate aspect of the forecast from the original ensemble forecasts. Based on the assumption of error stationarity, parametric methods aim to fully describe the forecast dependence structures. In this study, the concept of ECC is combined with past data statistics in order to account for the autocorrelation of the forecast error. The new approach which preserves the dynamical development of the ensemble members is called dynamic ensemble copula coupling (...

  13. Une-Mati lood vene keeles

    Index Scriptorium Estoniae

    2004-01-01

    Dagmar Normeti lasteraamatu "Une-Mati, Päris-Mati ja Tups" tõlget vene keelde (tõlkijad Irina Belobrovtseva ja Vitali Belobrovtsev; ill. Siima Shkop) esitletakse täna Kirjanike Liidu saalis; vt. ka Postimees, 19. märts, lk. 14

  14. Créer une haie vive

    OpenAIRE

    Gnahoua, Guy Modeste; Louppe, Dominique

    2003-01-01

    4 p.; Fiche technique; Fiche technique pour la création d'une haie vive : définition, espèces concernées, conception, techniques d'installation, entretien, coûts, impacts, conditions d'application

  15. La grammaire est une chanson douce

    Institute of Scientific and Technical Information of China (English)

    施婉丽

    2004-01-01

    Jeanne et Thomas, deux enfants rescapés d'un naufrage, échouent sur une ile paradisiaque. Or ils ne sont pas tout à fait sains et saufs puisqu'ils sont devenus muets. Plus aucun mot ne passe le seuil de leurs bouches. Le verbe les a désertées.

  16. Création d’une application android via Une autre application android (partie serveur).

    OpenAIRE

    SENOUSSAOUI, Ikram; LAKEHAL, Asma

    2015-01-01

    Tout au long de ce modeste travail, nous avons abordé le domaine de développement d’application mobile. Notre objectif principal, était de réaliser une application Android via une autre application Android. Beaucoup d'applications ont été développées dans divers domaines de l’Android. Cependant nous avons pensé comment utiliser une de ces application pour crée une autre. La spécificité de notre travail était dans la manière de générer le modèle de la nouvelle application et l’envoyer ve...

  17. 77 FR 6482 - Conductor Certification

    Science.gov (United States)

    2012-02-08

    ... TRANSPORTATION Federal Railroad Administration 49 CFR Part 242 Conductor Certification AGENCY: Federal Railroad..., published on November 9, 2011, which prescribed regulations for certification of conductors as required by... Certification, U.S. Department of Transportation, Federal Railroad Administration, Mail Stop-25, Room...

  18. Board Certification in Counseling Psychology

    Science.gov (United States)

    Crowley, Susan L.; Lichtenberg, James W.; Pollard, Jeffrey W.

    2012-01-01

    Although specialty board certification by the American Board of Professional Psychology (ABPP) has been a valued standard for decades, the vast majority of counseling psychologists do not pursue board certification in the specialty. The present article provides a brief history of board certification in general and some historical information about…

  19. Vers une vision surnaturelle de la folie

    Directory of Open Access Journals (Sweden)

    Mabel Franzone

    2006-12-01

    Full Text Available A partir de la difficile notion de "folie", il s’agit d’aller vers l’exclusion dont cette maladie a fait l’objet dans le système occidental moderne. Un autre traitement de la maladie mentale se fait jour avec des penseurs contemporains, la résurgence d’autres cosmovisions et de philosophies anciennes. Ainsi les délires mystique, paranoïaque, schizophrénique peuvent être étudiés d’une part comme des ruptures de limites, d’autre part comme une mise en relation du corps avec l’esprit. Entre les deux, le langage fait oeuvre de trait d’union, langage qui, chez les malades, dénote une créativité, la poésie. Si cette poésie permet une sortie, une explosion des limites de la réalité vers des régions inconnues, peut-être peut-on voir la folie comme un déséquilibre par rapport au monde, au cosmos même, déséquilibre qui peut être traité en responsabilisant l’homme, en le pensant, en le mettant en question. De ce point de vue, la folie ressort comme quelque chose de positif, comme l’un des thèmes qui nous repositionnera face au monde, en mettant à notre portée d’autres ontologies.

  20. Un nouveau mode d'approche du management. La demarche qualite vers la certification

    Directory of Open Access Journals (Sweden)

    Jean Réné MOREAU

    2000-01-01

    Full Text Available La certification du système qualité consiste à certifier l’ensemble de l’organisation, des procédures, des procédés utilisés et des moyens nécessaires pour produire et garantir l’obtention de prestations conformes aux exigences que l’on se fixe. La certification suppose des normes que l’on appelle ISO 9000 qui prennent en compte les remarques des utilisateurs et des retours d’expériences. Cette qualification se mesure jusqu’à la satisfaction du client.

  1. Hybrid Data Assimilation without Ensemble Filtering

    Science.gov (United States)

    Todling, Ricardo; Akkraoui, Amal El

    2014-01-01

    The Global Modeling and Assimilation Office is preparing to upgrade its three-dimensional variational system to a hybrid approach in which the ensemble is generated using a square-root ensemble Kalman filter (EnKF) and the variational problem is solved using the Grid-point Statistical Interpolation system. As in most EnKF applications, we found it necessary to employ a combination of multiplicative and additive inflations, to compensate for sampling and modeling errors, respectively and, to maintain the small-member ensemble solution close to the variational solution; we also found it necessary to re-center the members of the ensemble about the variational analysis. During tuning of the filter we have found re-centering and additive inflation to play a considerably larger role than expected, particularly in a dual-resolution context when the variational analysis is ran at larger resolution than the ensemble. This led us to consider a hybrid strategy in which the members of the ensemble are generated by simply converting the variational analysis to the resolution of the ensemble and applying additive inflation, thus bypassing the EnKF. Comparisons of this, so-called, filter-free hybrid procedure with an EnKF-based hybrid procedure and a control non-hybrid, traditional, scheme show both hybrid strategies to provide equally significant improvement over the control; more interestingly, the filter-free procedure was found to give qualitatively similar results to the EnKF-based procedure.

  2. Adjustment of solar testing laboratory of INTA to the European Standard UNE EN 12975; Adaptacion de laboratorio de ensayo de sistemas solares termicos del INTA a la norma Europea UNE EN 12975

    Energy Technology Data Exchange (ETDEWEB)

    Rengel, G. R.; Vargas, V. L.; Narbona, D. J.

    2004-07-01

    INTA Terrestrial Energies Systems Laboratory has been for the last 23 years, the only accredited center in Spain as official Laboratory of the Ministry of Industry for flat solar collector certification tests. More than 250 tests has been performance by INTA Standard (INTA 61 00 01) during this period. Due to the next application of the European Standard UNE-EN 12975 for those kind of tests, it is set as main objective the accreditation by ENAC of the laboratory in agreement with the mentioned standard. For this reason, this INTA Laboratory is suffering many modifications concerning management requirements (a Quality System development) as well as technical requirements (design of new facilities). (Author)

  3. MSEBAG: a dynamic classifier ensemble generation based on `minimum-sufficient ensemble' and bagging

    Science.gov (United States)

    Chen, Lei; Kamel, Mohamed S.

    2016-01-01

    In this paper, we propose a dynamic classifier system, MSEBAG, which is characterised by searching for the 'minimum-sufficient ensemble' and bagging at the ensemble level. It adopts an 'over-generation and selection' strategy and aims to achieve a good bias-variance trade-off. In the training phase, MSEBAG first searches for the 'minimum-sufficient ensemble', which maximises the in-sample fitness with the minimal number of base classifiers. Then, starting from the 'minimum-sufficient ensemble', a backward stepwise algorithm is employed to generate a collection of ensembles. The objective is to create a collection of ensembles with a descending fitness on the data, as well as a descending complexity in the structure. MSEBAG dynamically selects the ensembles from the collection for the decision aggregation. The extended adaptive aggregation (EAA) approach, a bagging-style algorithm performed at the ensemble level, is employed for this task. EAA searches for the competent ensembles using a score function, which takes into consideration both the in-sample fitness and the confidence of the statistical inference, and averages the decisions of the selected ensembles to label the test pattern. The experimental results show that the proposed MSEBAG outperforms the benchmarks on average.

  4. Towards FAA Certification of UAVs

    Science.gov (United States)

    Nelson, Stacy

    2003-01-01

    As of June 30, 2003, all Unmanned Aerial Vehicles (UAV), no matter how small, must adhere to the same FAA regulations as human-piloted aircraft. These regulations include certification for flying in controlled airspace and certification of flight software based on RTCA DO-178B. This paper provides an overview of the steps necessary to obtain certification, as well as a discussion about the challenges UAV's face when trying to meet these requirements. It is divided into two parts: 1) Certifications for Flying in Controlled Airspace; 2) Certification of Flight Software per RTCA DO-178B.

  5. Derivation of Mayer Series from Canonical Ensemble

    Science.gov (United States)

    Wang, Xian-Zhi

    2016-02-01

    Mayer derived the Mayer series from both the canonical ensemble and the grand canonical ensemble by use of the cluster expansion method. In 2002, we conjectured a recursion formula of the canonical partition function of a fluid (X.Z. Wang, Phys. Rev. E 66 (2002) 056102). In this paper we give a proof for this formula by developing an appropriate expansion of the integrand of the canonical partition function. We further derive the Mayer series solely from the canonical ensemble by use of this recursion formula.

  6. 4DVAR by ensemble Kalman smoother

    CERN Document Server

    Mandel, Jan; Gratton, Serge

    2013-01-01

    We propose to use the ensemble Kalman smoother (EnKS) as linear least squares solver in the Gauss-Newton method for the large nonlinear least squares in incremental 4DVAR. The ensemble approach is naturally parallel over the ensemble members and no tangent or adjoint operators are needed. Further, adding a regularization term results in replacing the Gauss-Newton method, which may diverge, by^M the Levenberg-Marquardt method, which is known to be convergent. The regularization is implemented efficiently as an additional observation in the EnKS.

  7. What is organic certification?

    Science.gov (United States)

    Certified organic crop production is a holistic approach to sustainable and healthy food production to enhance the well being of the consumer, while protecting natural resources. Organic certification was implemented by the National Organic Program (NOP) in 2002 in recognition of the necessity for c...

  8. Une histoire évolutive de l’habitat martiniquais

    Directory of Open Access Journals (Sweden)

    Christophe Denise

    2012-04-01

    Full Text Available Au cœur de l’habitat rural martiniquais se trouve la case. Elle s’inscrit dans un ensemble (case et dépendances qui fait appel à une gestion de l’espace. Son architecture est intimement liée au mode d’habiter et par là même aux rapports qu’entretient l’individu avec la société. Si au cours de son évolution, la case a connu bon nombre d’aménagements, les caractères essentiels de cet habitat ont été préservés. Face à la transformation qu'a connu le paysage rural martiniquais depuis le milieu du XXe siècle, elle reste un héritage culturel caractéristique du langage architectural créole, patrimoine historique des anciennes sociétés coloniales qu’il convient de protéger.In the heart of the rural settlement, there is the hut. It takes its place in a whole (hut and outbuildings which has recourse to a space management. Its architecture is linked to the mode of life and the individual’s relations with the society. If in its evolution the hut undergone many adjustments, its essential characteristics have been preserved. Facing the transformations of the rural settlement since the middle of the twentieth century, it stays a cultural legacy characteristic of architectural creole language, historical patrimony of the ex-colonial societies which should be protected.

  9. Ensemble Dynamics and Bred Vectors

    CERN Document Server

    Balci, Nusret; Restrepo, Juan M; Sell, George R

    2011-01-01

    We introduce the new concept of an EBV to assess the sensitivity of model outputs to changes in initial conditions for weather forecasting. The new algorithm, which we call the "Ensemble Bred Vector" or EBV, is based on collective dynamics in essential ways. By construction, the EBV algorithm produces one or more dominant vectors. We investigate the performance of EBV, comparing it to the BV algorithm as well as the finite-time Lyapunov Vectors. We give a theoretical justification to the observed fact that the vectors produced by BV, EBV, and the finite-time Lyapunov vectors are similar for small amplitudes. Numerical comparisons of BV and EBV for the 3-equation Lorenz model and for a forced, dissipative partial differential equation of Cahn-Hilliard type that arises in modeling the thermohaline circulation, demonstrate that the EBV yields a size-ordered description of the perturbation field, and is more robust than the BV in the higher nonlinear regime. The EBV yields insight into the fractal structure of th...

  10. Découverte d'une tumeur grêlique suite à une occlusion intestinale aigue chez une femme enceinte: à propos d'un cas

    OpenAIRE

    Chouaib, Naoufal; Rafai, Mostafa; El Bouti, Anas; Belkouch, Ahmed; El bakkali, Hicham; Belyamani, Lahcen

    2015-01-01

    L'association d'un cancer digestif avec la grossesse est rare et concerne avant tout les cancers colorectaux, de l'estomac ainsi que ceux se révélant par une tumeur de Krukenberg. Le diagnostic est souvent tardif expliquant la fréquence élevée des stades avancés. Nous rapportons un cas d'une femme enceinte qui a présenté une occlusion intestinale aigue sur tumeur colique. Il s'agissait d'une patiente enceinte de 32 semaines d'aménorrhées, admise pour syndrome occlusif évoluant depuis trois jo...

  11. Une herbe qui relie les parties du monde…

    Directory of Open Access Journals (Sweden)

    Louise Bénat-Tachot

    2011-06-01

    Full Text Available Le livre 50 de la Historia natural y moral de las Indias est la conclusion de trente-cinq années d’expérience américaine, de compilation de récits, de témoignages, d’entrevues dont Gonzalo Fernandez de Oviedo se fait le garant. Peu étudié et surtout classé comme une forme littéraire de l’histoire où intervient le miraculeux, cet ensemble de 19 chapitres présente néanmoins un intérêt singulier pour comprendre le monde colonial et l’importance que la navigation comme expérience commune partagée a pu avoir dans les sociétés en voie de constitution. Ce livre n’est donc pas simplement une vision assombrie de l’Amérique, aux antipodes de l’utopie, mais plutôt la claire affirmation d’un changement radical de la sensibilité sociale et de la culture matérielle. Le naufrage n’est pas autre chose que le coût de la modernité d’une navigation-monde ibérique qui dominera la deuxième moitié du XVIe siècle.El libro 50 de la Historia natural y moral de las Indias de Gonzalo Fernández de Oviedo se presenta como la conclusión de treinta y cinco años de experiencia americana del autor, durante la cual acumuló relatos, testimonios, realizó entrevistas, como cronista al servicio de la corona. Este libro, poco estudiado, se suele definir como un texto híbrido de « literatura » en el que se mezcla todo tipo de naufragios (sucesos milagrosos, curiosos o espantosos a lo largo de 19 capítulos. Sin embargo presenta un interés singular para el historiador por la visión del mundo colonial que dibuja y la importancia concedida a la navegación, como experiencia compartida por la mayoría, en el proceso de construcción de la sociedad colonial. Este libro de los naufragios no es solo un panorama oscurecido de las Indias Occidentales, contrapuesto al discurso utópico, es más bien la clara afirmación de un cambio radical en la sensibilidad y en la cultura material. El naufragio no es sino el coste de la modernidad

  12. A 4D-Ensemble-Variational System for Data Assimilation and Ensemble Initialization

    Science.gov (United States)

    Bowler, Neill; Clayton, Adam; Jardak, Mohamed; Lee, Eunjoo; Jermey, Peter; Lorenc, Andrew; Piccolo, Chiara; Pring, Stephen; Wlasak, Marek; Barker, Dale; Inverarity, Gordon; Swinbank, Richard

    2016-04-01

    The Met Office has been developing a four-dimensional ensemble variational (4DEnVar) data assimilation system over the past four years. The 4DEnVar system is intended both as data assimilation system in its own right and also an improved means of initializing the Met Office Global and Regional Ensemble Prediction System (MOGREPS). The global MOGREPS ensemble has been initialized by running an ensemble of 4DEnVars (En-4DEnVar). The scalability and maintainability of ensemble data assimilation methods make them increasingly attractive, and 4DEnVar may be adopted in the context of the Met Office's LFRic project to redevelop the technical infrastructure to enable its Unified Model (MetUM) to be run efficiently on massively parallel supercomputers. This presentation will report on the results of the 4DEnVar development project, including experiments that have been run using ensemble sizes of up to 200 members.

  13. Classification conceptuelle d'une collection documentaire. Intertextualité et Recherche d'Information

    OpenAIRE

    Mimouni, Nada; Nazarenko, Adeline; Salotti, Sylvie

    2012-01-01

    National audience; Une collection documentaire est généralement représentée comme un ensemble de documents mais cette modélisation ne permet pas de rendre compte des relations intertextuelles et du contexte d'interprétation d'un document. Le modèle documentaire classique trouve ses limites dans les domaines spécialisés où les besoins d'accès à l'information correspondent à des usages spécifiques et où les documents sont liés par de nombreux types de relations. Cet article propose un modèle pe...

  14. La linguistique de corpus : une alternative [version abrégée

    OpenAIRE

    Teubert,Wolfgang

    2012-01-01

    La linguistique de corpus a été développé pour extraire d’un corpus les connaissances linguistiques nécessaires à l’enseignement des langues ; un corpus étant un ensemble collecté et ordonné de données langagières réelles. Faisant partie de la linguistique appliquée, la linguistique de corpus n’a jamais revendiqué réellement de cadre théorique propre. Cependant, elle a procuré une manière nouvelle de regarder le langage. La linguistique de corpus situe la signification dans le discours, dans ...

  15. Praxéologie du droit de la copropriété au Maroc : Radiographie ethno-méthodologique d’une résidence à Tanger

    OpenAIRE

    Gignoux, Stéphane

    2015-01-01

    Cette contribution, basée sur notre double fonction de syndic et chercheur dans la ville de Tanger, propose une interrogation sur les liens entre droit et régulation dans le contexte marocain de la copropriété. Elle prend comme point de référence l’ensemble immobilier multifonctions « Tanger Boulevard », récemment construit et soumis au statut de la copropriété des immeubles bâtis. A partir d’une observation participante, la contribution entend décrire le jeu des acteurs à l’occasion de la pr...

  16. «Meilleures pratiques» de gouvernance, théorie de la firme et modèles de création de valeur: Une appréciation critique des codes de bonne conduite

    OpenAIRE

    Peter Wirtz

    2004-01-01

    La gouvernance, définie comme l’ensemble des mécanismes qui délimitent l’espace discrétionnaire du dirigeant, est désormais reconnue comme un aspect important dans la vie d’une entreprise. Cette reconnaissance s’est traduite, depuis environ une décennie, par des initiatives multiples visant à établir et à expliciter les « meilleures pratiques » en la matière. Elles émanent d’acteurs divers, qu’il s’agisse d’investisseurs institutionnels, d’ organismes internationaux, gouvernementaux ou de rep...

  17. Ensemble treatments of thermal pairing in nuclei

    Science.gov (United States)

    Hung, Nguyen Quang; Dang, Nguyen Dinh

    2009-10-01

    A systematic comparison is conducted for pairing properties of finite systems at nonzero temperature as predicted by the exact solutions of the pairing problem embedded in three principal statistical ensembles, namely the grandcanonical ensemble, canonical ensemble and microcanonical ensemble, as well as the unprojected (FTBCS1+SCQRPA) and Lipkin-Nogami projected (FTLN1+SCQRPA) theories that include the quasiparticle number fluctuation and coupling to pair vibrations within the self-consistent quasiparticle random-phase approximation. The numerical calculations are performed for the pairing gap, total energy, heat capacity, entropy, and microcanonical temperature within the doubly-folded equidistant multilevel pairing model. The FTLN1+SCQRPA predictions are found to agree best with the exact grand-canonical results. In general, all approaches clearly show that the superfluid-normal phase transition is smoothed out in finite systems. A novel formula is suggested for extracting the empirical pairing gap in reasonable agreement with the exact canonical results.

  18. Ensemble Machine Learning Methods and Applications

    CERN Document Server

    Ma, Yunqian

    2012-01-01

    It is common wisdom that gathering a variety of views and inputs improves the process of decision making, and, indeed, underpins a democratic society. Dubbed “ensemble learning” by researchers in computational intelligence and machine learning, it is known to improve a decision system’s robustness and accuracy. Now, fresh developments are allowing researchers to unleash the power of ensemble learning in an increasing range of real-world applications. Ensemble learning algorithms such as “boosting” and “random forest” facilitate solutions to key computational issues such as face detection and are now being applied in areas as diverse as object trackingand bioinformatics.   Responding to a shortage of literature dedicated to the topic, this volume offers comprehensive coverage of state-of-the-art ensemble learning techniques, including various contributions from researchers in leading industrial research labs. At once a solid theoretical study and a practical guide, the volume is a windfall for r...

  19. Transition from Poisson to circular unitary ensemble

    Indian Academy of Sciences (India)

    Vinayak; Akhilesh Pandey

    2009-09-01

    Transitions to universality classes of random matrix ensembles have been useful in the study of weakly-broken symmetries in quantum chaotic systems. Transitions involving Poisson as the initial ensemble have been particularly interesting. The exact two-point correlation function was derived by one of the present authors for the Poisson to circular unitary ensemble (CUE) transition with uniform initial density. This is given in terms of a rescaled symmetry breaking parameter Λ. The same result was obtained for Poisson to Gaussian unitary ensemble (GUE) transition by Kunz and Shapiro, using the contour-integral method of Brezin and Hikami. We show that their method is applicable to Poisson to CUE transition with arbitrary initial density. Their method is also applicable to the more general ℓ CUE to CUE transition where CUE refers to the superposition of ℓ independent CUE spectra in arbitrary ratio.

  20. Rejoindre une phrase, s’y poursuivre

    OpenAIRE

    2014-01-01

    Comment vivons-nous avec les phrases (et pas nécessairement avec les récits synthétiques) que nous lisons ou que nous avons lues ? Comment les citations littéraires deviennent-elles l’occasion d’une orientation intérieure de notre expérience ? Cet article souligne le mouvement esthétique par lequel nous pouvons être attirés vers des possibilités authentiques de nous-mêmes dans l’acte même de la lecture. Pour ainsi faire, il offre une vision dynamique du « style » et explore la logique de la l...

  1. D'une industrie... l'autre?

    NARCIS (Netherlands)

    Musso, S.; Nguyen, V.K.

    2013-01-01

    À partir d’une contextualisation du texte de Cindy Patton, les auteur-e-s invitent à penser l’actualité des questions évoquées à l’aune d’enjeux contemporains relatifs à la production d’identités et de communautés que donnent à voir l’établissement des « cibles » de la prévention et du traitement du

  2. Calibrating ensemble reliability whilst preserving spatial structure

    Directory of Open Access Journals (Sweden)

    Jonathan Flowerdew

    2014-03-01

    Full Text Available Ensemble forecasts aim to improve decision-making by predicting a set of possible outcomes. Ideally, these would provide probabilities which are both sharp and reliable. In practice, the models, data assimilation and ensemble perturbation systems are all imperfect, leading to deficiencies in the predicted probabilities. This paper presents an ensemble post-processing scheme which directly targets local reliability, calibrating both climatology and ensemble dispersion in one coherent operation. It makes minimal assumptions about the underlying statistical distributions, aiming to extract as much information as possible from the original dynamic forecasts and support statistically awkward variables such as precipitation. The output is a set of ensemble members preserving the spatial, temporal and inter-variable structure from the raw forecasts, which should be beneficial to downstream applications such as hydrological models. The calibration is tested on three leading 15-d ensemble systems, and their aggregation into a simple multimodel ensemble. Results are presented for 12 h, 1° scale over Europe for a range of surface variables, including precipitation. The scheme is very effective at removing unreliability from the raw forecasts, whilst generally preserving or improving statistical resolution. In most cases, these benefits extend to the rarest events at each location within the 2-yr verification period. The reliability and resolution are generally equivalent or superior to those achieved using a Local Quantile-Quantile Transform, an established calibration method which generalises bias correction. The value of preserving spatial structure is demonstrated by the fact that 3×3 averages derived from grid-scale precipitation calibration perform almost as well as direct calibration at 3×3 scale, and much better than a similar test neglecting the spatial relationships. Some remaining issues are discussed regarding the finite size of the output

  3. Cluster Ensemble-based Image Segmentation

    OpenAIRE

    Xiaoru Wang; Junping Du; Shuzhe Wu; Xu Li; Fu Li

    2013-01-01

    Image segmentation is the foundation of computer vision applications. In this paper, we propose a new cluster ensemble-based image segmentation algorithm, which overcomes several problems of traditional methods. We make two main contributions in this paper. First, we introduce the cluster ensemble concept to fuse the segmentation results from different types of visual features effectively, which can deliver a better final result and achieve a much more stable performance for broad categories ...

  4. Ozone ensemble forecast with machine learning algorithms

    OpenAIRE

    Mallet, Vivien; Stoltz, Gilles; Mauricette, Boris

    2009-01-01

    International audience; We apply machine learning algorithms to perform sequential aggregation of ozone forecasts. The latter rely on a multimodel ensemble built for ozone forecasting with the modeling system Polyphemus. The ensemble simulations are obtained by changes in the physical parameterizations, the numerical schemes, and the input data to the models. The simulations are carried out for summer 2001 over western Europe in order to forecast ozone daily peaks and ozone hourly concentrati...

  5. Reversible Projective Measurement in Quantum Ensembles

    CERN Document Server

    Khitrin, Anatoly; Lee, Jae-Seung

    2010-01-01

    We present experimental NMR demonstration of a scheme of reversible projective measurement, which allows extracting information on outcomes and probabilities of a projective measurement in a non-destructive way, with a minimal net effect on the quantum state of an ensemble. The scheme uses reversible dynamics and weak measurement of the intermediate state. The experimental system is an ensemble of 133Cs (S = 7/2) nuclei in a liquid-crystalline matrix.

  6. Towards a GME ensemble forecasting system: Ensemble initialization using the breeding technique

    Directory of Open Access Journals (Sweden)

    Jan D. Keller

    2008-12-01

    Full Text Available The quantitative forecast of precipitation requires a probabilistic background particularly with regard to forecast lead times of more than 3 days. As only ensemble simulations can provide useful information of the underlying probability density function, we built a new ensemble forecasting system (GME-EFS based on the GME model of the German Meteorological Service (DWD. For the generation of appropriate initial ensemble perturbations we chose the breeding technique developed by Toth and Kalnay (1993, 1997, which develops perturbations by estimating the regions of largest model error induced uncertainty. This method is applied and tested in the framework of quasi-operational forecasts for a three month period in 2007. The performance of the resulting ensemble forecasts are compared to the operational ensemble prediction systems ECMWF EPS and NCEP GFS by means of ensemble spread of free atmosphere parameters (geopotential and temperature and ensemble skill of precipitation forecasting. This comparison indicates that the GME ensemble forecasting system (GME-EFS provides reasonable forecasts with spread skill score comparable to that of the NCEP GFS. An analysis with the continuous ranked probability score exhibits a lack of resolution for the GME forecasts compared to the operational ensembles. However, with significant enhancements during the 3 month test period, the first results of our work with the GME-EFS indicate possibilities for further development as well as the potential for later operational usage.

  7. Hémangiome fusiforme: une localisation inhabituelle

    Science.gov (United States)

    Nasreddine, Fatima Zahra; Baghad, Bouchra; Chiheb, Soumiya

    2016-01-01

    L'hémangiome à cellules fusiformes été décrit par Weiss et Enzinger en 1986 et anciennement nommé hémangioendothéliome à cellules fusiformes. Depuis l'avènement des études immunohistochimique il n'est plus considéré en tant qu'angiosarcome de bas grade. C'est une tumeur bénigne vasculaire. Il touche presque exclusivement le derme des extrémités distales. Nous rapportons le premier cas avec localisation au niveau de l'omoplate, du sein, des cuisses et de la mandibule. Selon la littérature, seulement 9 cas localisés au niveau de la tête et le cou ont été rapportés. Nous rapportons un nouveau cas de cette entité rare et mal connue qui peut prêter confusion avec les tumeurs malignes. Notre patient avait une localisation au niveau de l'omoplate, du sein, des cuisses et de la mandibule. Une biopsie-exérèse était réalisée. L’évolution a été favorable avec un recul de 6 mois, sans rechute. PMID:27642429

  8. 33 CFR 159.15 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Certification. 159.15 Section 159... MARINE SANITATION DEVICES Certification Procedures § 159.15 Certification. (a) The recognized facility... certified, the Coast Guard includes a certification number for the device. If certification is denied,...

  9. 30 CFR 850.15 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Certification. 850.15 Section 850.15 Mineral..., EXAMINATION, AND CERTIFICATION OF BLASTERS PERMANENT REGULATORY PROGRAM REQUIREMENTS-STANDARDS FOR CERTIFICATION OF BLASTERS § 850.15 Certification. (a) Issuance of certification. The regulatory authority...

  10. The classicality and quantumness of a quantum ensemble

    CERN Document Server

    Zhu, Xuanmin; Wu, Shengjun; Liu, Quanhui

    2010-01-01

    In this paper, we investigate the classicality and quantumness of a quantum ensemble. We define a quantity called classicality to characterize how classical a quantum ensemble is. An ensemble of commuting states that can be manipulated classically has a unit classicality, while a general ensemble has a classicality less than 1. We also study how quantum an ensemble is by defining a related quantity called quantumness. We find that the classicality of an ensemble is closely related to how perfectly the ensemble can be cloned, and that the quantumness of an ensemble is essentially responsible for the security of quantum key distribution(QKD) protocols using that ensemble. Furthermore, we show that the quantumness of an ensemble used in a QKD protocol is exactly the attainable lower bound of the error rate in the sifted key.

  11. Certification/enforcement analysis

    Energy Technology Data Exchange (ETDEWEB)

    None

    1980-06-01

    Industry compliance with minimum energy efficiency standards will be assured through a two-part program approach of certification and enforcement activities. The technical support document (TSD) presents the analyses upon which the proposed rule for assuring that consumer product comply with applicable energy efficiency standards is based. Much of the TSD is based upon support provided DOE by Vitro Laboratories. The OAO Corporation provided additional support in the development of the sampling plan incorporated in the proposed rule. Vitro's recommended approach to appliance certification and enforcement, developed after consideration of various program options, benefits, and impacts, establishes the C/E program framework, general criteria, and procedures for assuring a specified level of energy efficiency performance of covered consumer products. The results of the OAO analysis are given in Volume II of the TSD.

  12. Ensemble postprocessing for probabilistic quantitative precipitation forecasts

    Science.gov (United States)

    Bentzien, S.; Friederichs, P.

    2012-12-01

    Precipitation is one of the most difficult weather variables to predict in hydrometeorological applications. In order to assess the uncertainty inherent in deterministic numerical weather prediction (NWP), meteorological services around the globe develop ensemble prediction systems (EPS) based on high-resolution NWP systems. With non-hydrostatic model dynamics and without parameterization of deep moist convection, high-resolution NWP models are able to describe convective processes in more detail and provide more realistic mesoscale structures. However, precipitation forecasts are still affected by displacement errors, systematic biases and fast error growth on small scales. Probabilistic guidance can be achieved from an ensemble setup which accounts for model error and uncertainty of initial and boundary conditions. The German Meteorological Service (Deutscher Wetterdienst, DWD) provides such an ensemble system based on the German-focused limited-area model COSMO-DE. With a horizontal grid-spacing of 2.8 km, COSMO-DE is the convection-permitting high-resolution part of the operational model chain at DWD. The COSMO-DE-EPS consists of 20 realizations of COSMO-DE, driven by initial and boundary conditions derived from 4 global models and 5 perturbations of model physics. Ensemble systems like COSMO-DE-EPS are often limited with respect to ensemble size due to the immense computational costs. As a consequence, they can be biased and exhibit insufficient ensemble spread, and probabilistic forecasts may be not well calibrated. In this study, probabilistic quantitative precipitation forecasts are derived from COSMO-DE-EPS and evaluated at more than 1000 rain gauges located all over Germany. COSMO-DE-EPS is a frequently updated ensemble system, initialized 8 times a day. We use the time-lagged approach to inexpensively increase ensemble spread, which results in more reliable forecasts especially for extreme precipitation events. Moreover, we will show that statistical

  13. 42 CFR 493.43 - Application for registration certificate, certificate for provider-performed microscopy (PPM...

    Science.gov (United States)

    2010-10-01

    ..., certificate for provider-performed microscopy (PPM) procedures, and certificate of compliance. 493.43 Section... Provider-performed Microscopy Procedures, and Certificate of Compliance § 493.43 Application for registration certificate, certificate for provider-performed microscopy (PPM) procedures, and certificate...

  14. Le FOS: une évaluation des ressources pédagogiques en ligne

    Directory of Open Access Journals (Sweden)

    Nuria Rodríguez

    2007-04-01

    Full Text Available Conscients de l’importance croissante que revêtent la formation en distanciel et par voie de conséquence les méthodes, outils et activités articulées autour d’un apprentissage autonome, cette étude se propose d’évaluer l’ensemble des ressources pédagogiques en ligne mises à disposition de l’internaute apprenant. Comme les contenus interactifs et multimédia concernant le FLE (français langue étrangère sont innombrables, nous nous sommes centrés sur le français de spécialité (FOS: français sur objectifs spécifiques, en particulier, le français des affaires et du tourisme. Notre objectif étant de compléter un travail précédent portant sur l’évaluation des sites FOS, de nouveaux critères ont été considérés pour une utilisation optimale des ressources en jeu. Il s’avère qu’une bonne combinaison des outils pédagogiques disponibles sur Internet pourrait être une bonne option pour les apprenants du français des affaires, alors que les outils de formation interactive concernant le français du tourisme demeurent insuffisants pour garantir un apprentissage adéquat de cette langue spécifique.

  15. Le dessalement de l’eau de mer est-il une voie d’avenir?

    Directory of Open Access Journals (Sweden)

    Jean-Noël Salomon

    2012-06-01

    Full Text Available La pénurie en eau semble devenir une perspective inquiétante pour l’humanité. Aujourd’hui les pays en situation de stress hydrique sont de plus en plus nombreux tandis que les besoins ne cessent de grandir. Face à ce constat, nombre de solutions techniques ont été apportées dont celle du dessalement de l’eau de mer. Cette activité est en pleine expansion du fait d’une amélioration constante des techniques et d’un coût de plus en plus réduit. Déjà le dessalement représente la principale source d’eau potable pour un grand nombre de pays (îles, pays à climat désertique ou subdésertique, etc.. Mais, ce coût restant encore bien supérieur à celui des autres modes d’alimentation, cette technique reste réservée à des États ayant des ressources financières et énergétiques consistantes (Moyen Orient, pays développés, ce qui limite les possibilités. L’avenir du dessalement doit également prendre en compte ses effets sur l’environnement car de plus en plus d’études en montrent les effets pervers et …coûteux. Cet article entend faire le point et attirer l’attention sur l’ensemble de cette technique qui offre une alternative intéressante au spectre de la pénurie d’eau annoncée par bien des médias dans le contexte du réchauffement climatique.

  16. Certification trails for data structures

    Science.gov (United States)

    Sullivan, Gregory F.; Masson, Gerald M.

    1993-01-01

    Certification trails are a recently introduced and promising approach to fault detection and fault tolerance. The applicability of the certification trail technique is significantly generalized. Previously, certification trails had to be customized to each algorithm application; trails appropriate to wide classes of algorithms were developed. These certification trails are based on common data-structure operations such as those carried out using these sets of operations such as those carried out using balanced binary trees and heaps. Any algorithms using these sets of operations can therefore employ the certification trail method to achieve software fault tolerance. To exemplify the scope of the generalization of the certification trail technique provided, constructions of trails for abstract data types such as priority queues and union-find structures are given. These trails are applicable to any data-structure implementation of the abstract data type. It is also shown that these ideals lead naturally to monitors for data-structure operations.

  17. Toxoplasmose oculaire atypique chez une femme congolaise de 72 ans: à propos d'une observation

    Science.gov (United States)

    Bienvenu, Yogolelo Asani; Angel, Musau Nkola; Eric, Kasamba Ilunga; Socrate, Kapalu Mwangala; Sebastien, Mbuyi Musanzayi; Philippe, Cilundika Mulenga; Leon, Kabamba Ngombe; Bruno, Iye Ombamba Kayimba; Gaby, Chenge Borasisi

    2015-01-01

    Les auteurs rapportent un cas de toxoplasmose oculaire binoculaire, rarement décrit dans la littérature, chez une personne âgée de 72 ans, de sexe féminin, à laquelle s'associe une rétinite pigmentaire unilatérale. Cette observation permet d'attirer l'attention de la communauté scientifique sur les autres formes ou variétés de présentation moins courantes, « atypiques », pouvant être rencontrées ou associées à la toxoplasmose oculaire. PMID:26958130

  18. Comprehensive measurements in 4 {pi} geometry for radio-active samples having a low {beta}-activity (1962); Ensemble de mesure'en geometrie 4 {pi} pour echantillons radioactifs de faible activite {beta} (1962)

    Energy Technology Data Exchange (ETDEWEB)

    Colomer, J.; Valentin, M. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1961-07-01

    The realisation is described of a comprehensive measurement system having low background noise and, as well as a lead-wall protection, an electronic protection made up of a plastic scintillator placed in anticoincidence with the 4 {pi} counter used for making the measurements. The apparatus is described and its performance discussed. (authors) [French] Realisation d'un ensemble de mesures ayant un faible bruit de fond en utilisant en plus d'une protection par murs de Pb, une protection electronique constituee par un scintillateur plastique mis en ainticoincidence avec le compteur 4 {pi} utilise pour faire les mesures. L'appareillage est decrit et ses performances discutees. (auteurs)

  19. 77 FR 70176 - Previous Participation Certification

    Science.gov (United States)

    2012-11-23

    ... URBAN DEVELOPMENT Previous Participation Certification AGENCY: Office of the Chief Information Officer... digital submission of all data and certifications is available via HUD's secure Internet systems. However...: Previous Participation Certification. OMB Approval Number: 2502-0118. Form Numbers: HUD-2530 ....

  20. Generation of scenarios from calibrated ensemble forecasts with a dual ensemble copula coupling approach

    DEFF Research Database (Denmark)

    Ben Bouallègue, Zied; Heppelmann, Tobias; Theis, Susanne E.

    2016-01-01

    Probabilistic forecasts in the form of ensemble of scenarios are required for complex decision making processes. Ensemble forecasting systems provide such products but the spatio-temporal structures of the forecast uncertainty is lost when statistical calibration of the ensemble forecasts...... is applied for each lead time and location independently. Non-parametric approaches allow the reconstruction of spatio-temporal joint probability distributions at a low computational cost. For example, the ensemble copula coupling (ECC) method rebuilds the multivariate aspect of the forecast from...... the original ensemble forecasts. Based on the assumption of error stationarity, parametric methods aim to fully describe the forecast dependence structures. In this study, the concept of ECC is combined with past data statistics in order to account for the autocorrelation of the forecast error. The new...

  1. Generation of scenarios from calibrated ensemble forecasts with a dynamic ensemble copula coupling approach

    DEFF Research Database (Denmark)

    Ben Bouallègue, Zied; Heppelmann, Tobias; Theis, Susanne E.

    2015-01-01

    Probabilistic forecasts in the form of ensemble of scenarios are required for complex decision making processes. Ensemble forecasting systems provide such products but the spatio-temporal structures of the forecast uncertainty is lost when statistical calibration of the ensemble forecasts...... is applied for each lead time and location independently. Non-parametric approaches allow the reconstruction of spatio-temporal joint probability distributions at a low computational cost.For example, the ensemble copula coupling (ECC) method consists in rebuilding the multivariate aspect of the forecast...... from the original ensemble forecasts. Based on the assumption of error stationarity, parametric methods aim to fully describe the forecast dependence structures. In this study, the concept of ECC is combined with past data statistics in order to account for the autocorrelation of the forecast error...

  2. Multiscale macromolecular simulation: role of evolving ensembles.

    Science.gov (United States)

    Singharoy, A; Joshi, H; Ortoleva, P J

    2012-10-22

    Multiscale analysis provides an algorithm for the efficient simulation of macromolecular assemblies. This algorithm involves the coevolution of a quasiequilibrium probability density of atomic configurations and the Langevin dynamics of spatial coarse-grained variables denoted order parameters (OPs) characterizing nanoscale system features. In practice, implementation of the probability density involves the generation of constant OP ensembles of atomic configurations. Such ensembles are used to construct thermal forces and diffusion factors that mediate the stochastic OP dynamics. Generation of all-atom ensembles at every Langevin time step is computationally expensive. Here, multiscale computation for macromolecular systems is made more efficient by a method that self-consistently folds in ensembles of all-atom configurations constructed in an earlier step, history, of the Langevin evolution. This procedure accounts for the temporal evolution of these ensembles, accurately providing thermal forces and diffusions. It is shown that efficiency and accuracy of the OP-based simulations is increased via the integration of this historical information. Accuracy improves with the square root of the number of historical timesteps included in the calculation. As a result, CPU usage can be decreased by a factor of 3-8 without loss of accuracy. The algorithm is implemented into our existing force-field based multiscale simulation platform and demonstrated via the structural dynamics of viral capsomers.

  3. Une ou plusieurs sociologies ?

    Directory of Open Access Journals (Sweden)

    Nathalie Heinich

    2012-01-01

    Full Text Available Après une ébauche de diagnostic des causes et des effets de la « bulle » sociologique qui s’est créée en France dans la dernière génération, cet article reprend une tentative de cartographie des quatre grandes tendances de la sociologie telle qu’elle avait été proposée il y a quelques années dans la Revue du Mauss. Il s’agit de mettre en évidence, par-delà l’apparente homogénéité de la discipline intitulée « sociologie », deux grandes lignes de clivage : d’une part, l’opposition entre une « sociologie du social » et une « sociologie de l’expérience » ; d’autre part, une sociologie à visée normative et une sociologie analytico-descriptive. Une fois croisées, ces lignes dessinent quatre zones (ou familles sociologiques, entre quatre « points cardinaux » (ou positions idéal-typiques dont elles s’approchent plus ou moins. L’article se termine par un court plaidoyer en faveur d’une sociologie de l’expérience analytico-descriptive, en tant qu’elle est la plus spécifique de ce qu’autorisent les méthodes et les outils de cette discipline.¿Una o varias sociologías? Esbozo « cartográfico »Después de realizar un bosquejo del diagnóstico de las causas y de los efectos de la « burbuja » sociológica que se formó en Francia en el transcurso de la generación anterior, este artículo retoma una tentativa de « cartografía » de las cuatro principales tendencias de la sociología tal como había sido representada hace varios años en la Revue du Mauss. Se trata de poner en evidencia, más allá de la homogeneidad aparente de la materia llamada « sociología », dos grandes líneas de fractura: por una parte la oposición entre una « sociología de lo social » y una « sociología de la experiencia ». Por otra parte una sociología con objetivos normativos y una sociología analítico-descriptiva. Una vez cruzadas esas líneas aparecen cuatro zonas (o familias

  4. Sarcoidose et spondylarthrite ankylosante: une association rare

    OpenAIRE

    Fatima Zahra El Ouazzani; Latifa Tahiri; Nessrine Akasbi; Nadira Kadi; Taoufik Harzy

    2011-01-01

    L’association spondylarthrite ankylosante et sarcoïdose est rare, seize cas ont été publiés dans la littérature, nous en rapportons un nouveau cas. Cette association qui pose des problèmes diagnostiques est probablement fortuite du fait de l’absence de facteurs génétiques prédisposant partagés et du petit nombre des cas publiés, mais elle suggère l’hypothèse d’une liaison physiopathologique entre eux.

  5. Sarcoidose et spondylarthrite ankylosante: une association rare

    Directory of Open Access Journals (Sweden)

    Fatima Zahra El Ouazzani

    2011-03-01

    Full Text Available L’association spondylarthrite ankylosante et sarcoïdose est rare, seize cas ont été publiés dans la littérature, nous en rapportons un nouveau cas. Cette association qui pose des problèmes diagnostiques est probablement fortuite du fait de l’absence de facteurs génétiques prédisposant partagés et du petit nombre des cas publiés, mais elle suggère l’hypothèse d’une liaison physiopathologique entre eux.

  6. Einstein une biographie dessinée

    CERN Document Server

    Maier, Corinne

    2015-01-01

    « Je m'appelle Albert Einstein. En voulant comprendre l'univers, j'ai libéré des forces de destruction terrifiantes. Mais il faut continuer à chercher le grand secret du cosmos. » Albert Einstein (1879-1955) est un immense génie devenu, sans le vouloir, une star de la science. Avec ses théories de la relativité restreinte puis de la relativité générale, il a radicalement transformé nos vies. Voici le récit de son existence passionnée et de ses contributions fondamentales.

  7. Une hanche douloureuse révélatrice d'une histiocytose osseuse multifocale

    Science.gov (United States)

    Lahrach, Kamal; Alaoui, Adil; el Kadi, Khalid Ibn; Marzouki, Amine; Boutayeb, Fawzi

    2014-01-01

    L'histiocytose langerhansienne est une maladie rare qui touche principalement l'enfant et l'adulte jeune. Elle peut prendre plusieurs aspects, L'atteinte osseuse peut être uni- ou multifocale. Nous rapportons une observation d'histiocytose langerhansienne osseuse multifocale, révélée chez un patient âgé de 23 ans et ayant touché le col fémoral droit. La scintigraphie osseuse a permis de retrouver plusieurs localisations: l'os temporal, humérale et scapulaire droite. En raison du risque fracturaire, le patient a bénéficié d'une ostéosynthèse par vis-plaque DHS avec curetage biopsie de la lésion. L'examen histologique a révélé une histiocytose langerhansienne. L'évolution fut favorable après chimiothérapie par voie générale. PMID:25018840

  8. Sur les traces du « vivre-ensemble »

    Directory of Open Access Journals (Sweden)

    Elena Fiorletta

    2012-02-01

    Full Text Available « Je suis profondément impressionné par tout ce que j’y ai vu. Tout en n’ignorant d’aucune façon les difficultés, et souvent les préoccupations de nombreux aspects de la vie collective, cette terre donne cependant dans son ensemble une image de volonté et de transformation si vive, persuasive. D’un point de vue professionnel, c’est un champ si extraordinairement attrayant pour mettre à l’œuvre de nouvelles forces, que je ne nourris plus que d’autres désirs que de pouvoir y travailler ». L’au...

  9. Un ensemble urbain Art Déco en Egypte : Héliopolis, banlieue du Caire

    OpenAIRE

    Volait, Mercedes

    2006-01-01

    International audience; Analyse historique de l'ensemble urbain Art Déco d'Héliopolis, depuis la concession octroyée le 23 mai 1905 au baron Edouard Empain et à son associé Boghos Nubar pour la création d'une banlieue résidentielle au Caire. L'auteur montre que l'évolution urbaine et architecturale de la ville, fruit de brassages de populations et de cultures très diverses, a créé un mélange des genres cependant maîtrisé par la régulation esthétique tenace décidée dès l'origine par les promot...

  10. Cavity cooling of an ensemble spin system.

    Science.gov (United States)

    Wood, Christopher J; Borneman, Troy W; Cory, David G

    2014-02-07

    We describe how sideband cooling techniques may be applied to large spin ensembles in magnetic resonance. Using the Tavis-Cummings model in the presence of a Rabi drive, we solve a Markovian master equation describing the joint spin-cavity dynamics to derive cooling rates as a function of ensemble size. Our calculations indicate that the coupled angular momentum subspaces of a spin ensemble containing roughly 10(11) electron spins may be polarized in a time many orders of magnitude shorter than the typical thermal relaxation time. The described techniques should permit efficient removal of entropy for spin-based quantum information processors and fast polarization of spin samples. The proposed application of a standard technique in quantum optics to magnetic resonance also serves to reinforce the connection between the two fields, which has recently begun to be explored in further detail due to the development of hybrid designs for manufacturing noise-resilient quantum devices.

  11. Embedded random matrix ensembles in quantum physics

    CERN Document Server

    Kota, V K B

    2014-01-01

    Although used with increasing frequency in many branches of physics, random matrix ensembles are not always sufficiently specific to account for important features of the physical system at hand. One refinement which retains the basic stochastic approach but allows for such features consists in the use of embedded ensembles.  The present text is an exhaustive introduction to and survey of this important field. Starting with an easy-to-read introduction to general random matrix theory, the text then develops the necessary concepts from the beginning, accompanying the reader to the frontiers of present-day research. With some notable exceptions, to date these ensembles have primarily been applied in nuclear spectroscopy. A characteristic example is the use of a random two-body interaction in the framework of the nuclear shell model. Yet, topics in atomic physics, mesoscopic physics, quantum information science and statistical mechanics of isolated finite quantum systems can also be addressed using these ensemb...

  12. Characteristic polynomials in real Ginibre ensembles

    Energy Technology Data Exchange (ETDEWEB)

    Akemann, G; Phillips, M J [Department of Mathematical Sciences and BURSt Research Centre, Brunel University West London, UB8 3PH Uxbridge (United Kingdom); Sommers, H-J [Fachbereich Physik, Universitaet Duisburg-Essen, 47048 Duisburg (Germany)], E-mail: Gernot.Akemann@brunel.ac.uk, E-mail: Michael.Phillips@brunel.ac.uk, E-mail: H.J.Sommers@uni-due.de

    2009-01-09

    We calculate the average of two characteristic polynomials for the real Ginibre ensemble of asymmetric random matrices, and its chiral counterpart. Considered as quadratic forms they determine a skew-symmetric kernel from which all complex eigenvalue correlations can be derived. Our results are obtained in a very simple fashion without going to an eigenvalue representation, and are completely new in the chiral case. They hold for Gaussian ensembles which are partly symmetric, with kernels given in terms of Hermite and Laguerre polynomials respectively, depending on an asymmetry parameter. This allows us to interpolate between the maximally asymmetric real Ginibre and the Gaussian orthogonal ensemble, as well as their chiral counterparts. (fast track communication)

  13. On large deviations for ensembles of distributions

    Science.gov (United States)

    Khrychev, D. A.

    2013-11-01

    The paper is concerned with the large deviations problem in the Freidlin-Wentzell formulation without the assumption of the uniqueness of the solution to the equation involving white noise. In other words, it is assumed that for each \\varepsilon>0 the nonempty set \\mathscr P_\\varepsilon of weak solutions is not necessarily a singleton. Analogues of a number of concepts in the theory of large deviations are introduced for the set \\{\\mathscr P_\\varepsilon,\\,\\varepsilon>0\\}, hereafter referred to as an ensemble of distributions. The ensembles of weak solutions of an n-dimensional stochastic Navier-Stokes system and stochastic wave equation with power-law nonlinearity are shown to be uniformly exponentially tight. An idempotent Wiener process in a Hilbert space and idempotent partial differential equations are defined. The accumulation points in the sense of large deviations of the ensembles in question are shown to be weak solutions of the corresponding idempotent equations. Bibliography: 14 titles.

  14. Control and Synchronization of Neuron Ensembles

    CERN Document Server

    Li, Jr-Shin; Ruths, Justin

    2011-01-01

    Synchronization of oscillations is a phenomenon prevalent in natural, social, and engineering systems. Controlling synchronization of oscillating systems is motivated by a wide range of applications from neurological treatment of Parkinson's disease to the design of neurocomputers. In this article, we study the control of an ensemble of uncoupled neuron oscillators described by phase models. We examine controllability of such a neuron ensemble for various phase models and, furthermore, study the related optimal control problems. In particular, by employing Pontryagin's maximum principle, we analytically derive optimal controls for spiking single- and two-neuron systems, and analyze the applicability of the latter to an ensemble system. Finally, we present a robust computational method for optimal control of spiking neurons based on pseudospectral approximations. The methodology developed here is universal to the control of general nonlinear phase oscillators.

  15. Circular β ensembles, CMV representation, characteristic polynomials

    Institute of Scientific and Technical Information of China (English)

    SU ZhongGen

    2009-01-01

    In this note we first briefly review some recent progress in the study of the circular β ensemble on the unit circle, where 0 > 0 is a model parameter. In the special cases β = 1,2 and 4, this ensemble describes the joint probability density of eigenvalues of random orthogonal, unitary and sympletic matrices, respectively. For general β, Killip and Nenciu discovered a five-diagonal sparse matrix model, the CMV representation. This representation is new even in the case β = 2; and it has become a powerful tool for studying the circular β ensemble. We then give an elegant derivation for the moment identities of characteristic polynomials via the link with orthogonal polynomials on the unit circle.

  16. PULSE Pilot Certification Results

    Directory of Open Access Journals (Sweden)

    Pamela Pape-Lindstrom

    2015-08-01

    Full Text Available The pilot certification process is an ambitious, nationwide endeavor designed to motivate important changes in life sciences education that are in line with the recommendations of the 2011 Vision and Change Report: A Call to Action (American Association for the Advancement of Science [AAAS], 2011.  It is the goal of the certification process to acknowledge departments that have progressed towards full implementation of the tenets of Vision and Change and to motivate departments that have not begun to adopt the recommendations to consider doing so.  More than 70 life science departments applied to be part of the pilot certification process, funded by a National Science Foundation grant, and eight were selected based on initial evidence of transformed and innovative educational practices.  The programs chosen represent a wide variety of schools, including two-year colleges, liberal-arts institutions, regional comprehensive colleges, research universities and minority serving institutions.  Outcomes from this pilot were released June 1, 2015 (www.pulsecommunity.org, with all eight programs being recognized as having progressed along a continuum of change.  Five levels of achievement were defined as PULSE Pilot Progression Levels.  Of the eight departments in the pilot, one achieved “PULSE Progression Level III: Accomplished”.  Six departments achieved “PULSE Progression Level II: Developing” and one pilot department achieved “PULSE Progression Level I: Beginning”.  All of the schools have made significant movement towards the recommendations of Vision and Change relative to a traditional life sciences curriculum.  Overall, the response from the eight pilot schools has been positive. 

  17. Ensemble Enabled Weighted PageRank

    CERN Document Server

    Luo, Dongsheng; Hu, Renjun; Duan, Liang; Ma, Shuai

    2016-01-01

    This paper describes our solution for WSDM Cup 2016. Ranking the query independent importance of scholarly articles is a critical and challenging task, due to the heterogeneity and dynamism of entities involved. Our approach is called Ensemble enabled Weighted PageRank (EWPR). To do this, we first propose Time-Weighted PageRank that extends PageRank by introducing a time decaying factor. We then develop an ensemble method to assemble the authorities of the heterogeneous entities involved in scholarly articles. We finally propose to use external data sources to further improve the ranking accuracy. Our experimental study shows that our EWPR is a good choice for ranking scholarly articles.

  18. Are you considering organic certification?

    Science.gov (United States)

    Organic certification was developed in recognition of the necessity for consistent standards across the U.S. for the benefit of producers, processors, wholesalers, retailers, and consumers. Prior to establishment of federal guidelines (National Organic Program) for organic certification in 2002, a ...

  19. Ensemble Eclipse: A Process for Prefab Development Environment for the Ensemble Project

    Science.gov (United States)

    Wallick, Michael N.; Mittman, David S.; Shams, Khawaja, S.; Bachmann, Andrew G.; Ludowise, Melissa

    2013-01-01

    This software simplifies the process of having to set up an Eclipse IDE programming environment for the members of the cross-NASA center project, Ensemble. It achieves this by assembling all the necessary add-ons and custom tools/preferences. This software is unique in that it allows developers in the Ensemble Project (approximately 20 to 40 at any time) across multiple NASA centers to set up a development environment almost instantly and work on Ensemble software. The software automatically has the source code repositories and other vital information and settings included. The Eclipse IDE is an open-source development framework. The NASA (Ensemble-specific) version of the software includes Ensemble-specific plug-ins as well as settings for the Ensemble project. This software saves developers the time and hassle of setting up a programming environment, making sure that everything is set up in the correct manner for Ensemble development. Existing software (i.e., standard Eclipse) requires an intensive setup process that is both time-consuming and error prone. This software is built once by a single user and tested, allowing other developers to simply download and use the software

  20. Total probabilities of ensemble runoff forecasts

    Science.gov (United States)

    Olav Skøien, Jon; Bogner, Konrad; Salamon, Peter; Smith, Paul; Pappenberger, Florian

    2016-04-01

    Ensemble forecasting has for a long time been used as a method in meteorological modelling to indicate the uncertainty of the forecasts. However, as the ensembles often exhibit both bias and dispersion errors, it is necessary to calibrate and post-process them. Two of the most common methods for this are Bayesian Model Averaging (Raftery et al., 2005) and Ensemble Model Output Statistics (EMOS) (Gneiting et al., 2005). There are also methods for regionalizing these methods (Berrocal et al., 2007) and for incorporating the correlation between lead times (Hemri et al., 2013). Engeland and Steinsland Engeland and Steinsland (2014) developed a framework which can estimate post-processing parameters which are different in space and time, but still can give a spatially and temporally consistent output. However, their method is computationally complex for our larger number of stations, and cannot directly be regionalized in the way we would like, so we suggest a different path below. The target of our work is to create a mean forecast with uncertainty bounds for a large number of locations in the framework of the European Flood Awareness System (EFAS - http://www.efas.eu) We are therefore more interested in improving the forecast skill for high-flows rather than the forecast skill of lower runoff levels. EFAS uses a combination of ensemble forecasts and deterministic forecasts from different forecasters to force a distributed hydrologic model and to compute runoff ensembles for each river pixel within the model domain. Instead of showing the mean and the variability of each forecast ensemble individually, we will now post-process all model outputs to find a total probability, the post-processed mean and uncertainty of all ensembles. The post-processing parameters are first calibrated for each calibration location, but assuring that they have some spatial correlation, by adding a spatial penalty in the calibration process. This can in some cases have a slight negative

  1. Une algèbre de Boole pour l'approche événementielle des systèmes logiques

    OpenAIRE

    Roussel, Jean-Marc; Lesage, Jean-Jacques

    1993-01-01

    International audience; La modélisation dynamique des systèmes logiques fait largement appel à la notion “d'événement”. En Grafcet par exemple, les événements sont représentés par des fronts de variables logiques. De nombreuses ambiguïtés sont cependant rencontrées dans les modèles car la représentation des événements par des fronts n'est pas assez formelle. Dans cet article, nous proposons une algèbre de Boole dont l'ensemble de définition permet une représentation temporelle des entrées et d...

  2. Conception et réalisation d'une instrumentation terminale intégrée en chirurgie mini-invasive robotisée

    OpenAIRE

    Van Meer, Frédérick

    2005-01-01

    On assiste depuis quelques années à l'émergence d'une robotique médicale proposée pour accroître la précision des actes, améliorer les conditions de travail de l'équipe chirurgicale et le confort du patient. Nos recherches s'inscrivent dans le projet national EndoXiroB du RNTS dont l'objectif est la réalisation d'un ensemble robotisé de chirurgie mini-invasive. Elles sont dédiées à la conception et à la réalisation, en s'appuyant sur les technologies microsystèmes, d' une instrumentation chir...

  3. ISO 14006. Experiencias previas de estudios de arquitectura que han adoptado el estándar de ecodiseño UNE 150301:2003

    Directory of Open Access Journals (Sweden)

    Arana-Landín, G.

    2012-09-01

    Full Text Available This paper aims to analyze the pioneer UNE 150301 standard, as well as its adoption process and its practical results in the sector of architecture studios. First, the structure, the aim and the scope of norm UNE 150301 have been analysed. Second, the standard's implementation has been examined, concluding that 73% of the companies that have obtained the certificate are architecture studios. A case study has therefore been carried out with the participation of five architecture studios pioneers. These experiences have let us know the main aspects and difficulties of the process. In conclusion, the adoption of the standard UNE 150301 can be a helpful tool in order to reduce the environmental impact of the products and obtain some competitive advantages such as cost reduction, improvement in energy efficiency of the product and a better adaptation to acts and regulations.

    En este artículo se analiza la experiencia de implantación de la norma UNE 150301 de ecodiseño en el sector de los estudios de arquitectura. Tras el examen de la estructura de norma UNE 150301, de sus objetivos y de su alcance, se analiza su difusión, destacándose que el 73% de las empresas certificadas en España son estudios de arquitectura. A continuación se estudia el proceso de implantación real, mediante el estudio de caso que lo analiza en cinco estudios de arquitectura. El estudio realizado permite conocer de primera mano las principales claves y dificultades del proceso de implantación del estándar, así como los resultados obtenidos, entre los que destaca una reducción del impacto ambiental. Se constata, en suma, que la norma UNE 150301 es una herramienta que puede proporcionar ventajas competitivas interesantes a las empresas del sector de los estudios de arquitectura.

  4. Le soja local en Allemagne, une demande soutenue, une offre qui s’étoffe

    Directory of Open Access Journals (Sweden)

    Recknagel Jürgen

    2015-09-01

    Full Text Available Depuis 2009, la sole de soja ne cesse d’augmenter en Allemagne, surtout dans le sud du pays mais aussi à l’est et un peu partout dans les régions au climat propice. Un programme national a permis de créer les références nécessaires pour un conseil qualifié apporté aux agriculteurs via un réseau de développement. Ainsi toute une filière soja est déjà bien avancée dans le sud et en cours de mise en place dans le reste du pays, pour organiser la collecte auprès des producteurs et obtenir une offre groupée pour les transformateurs pour l’alimentation animale et humaine. Le soja allemand ne veut pas rivaliser avec le soja OGM ni pour instant avec le soja non-OGM des Amériques mais vise plutôt les filières courtes régionales et le marché bio qui est encore plus déficitaire en auto-approvisionnement que le conventionnel. Avec 10 000 ha en 2014, dont 25 % en bio, le soja en Allemagne est encore loin de la surface du maïs grain (2008–2014 autour de 500 000 ha. En pratique, 20 % de ces surfaces de maïs au climat a priori propice pourraient représenter le potentiel réel pour le soja en Allemagne, sous condition de prix garantissant une rentabilité suffisante par rapport aux autres grandes cultures. Pour les programmes non-OGM des grands distributeurs, il faut de toute façon une base de production élargie comme celle proposée par l’initiative Danube-Soja, qui dans une version Europe-Soja engloberait aussi la France. Avec le verdissement de la PAC et la montée du cours du Dollar par rapport à l’Euro, les perspectives pour une augmentation de la surface de production de soja en Allemagne et en Europe paraissent bonnes. Maintenant il faut travailler sur les débouchés pour garantir l’absorption de la production grandissante par les marchés et les consommateurs à tous les niveaux : régional, national et européen.

  5. Le rêve d'une fille

    Institute of Scientific and Technical Information of China (English)

    袁凤

    2011-01-01

    Un jour,après un cours de géographie dans un collège,une petite fille de 13 ans a transformé son argent de poche en une carte du monde dans une librairie.Elle l'a collée sur le mur devant le lit dans sa chambre.Ce monde sur papier entrait dans ses yeux dès qu'elle les ouvrait chaque matin.Elle marquait d'une étoile le pays sur cette carte du monde chaque fois qu'elle l'avait visité.Le rêve de faire un voyage dans le monde entier lui est venu à l'esprit,et est ainsi devenu une force tout au long de son parcours.

  6. NYYD Ensemble ja Riho Sibul / Anneli Remme

    Index Scriptorium Estoniae

    Remme, Anneli, 1968-

    2001-01-01

    Gavin Bryarsi teos "Jesus' Blood Never Failed Me Yet" NYYD Ensemble'i ja Riho Sibula esituses 27. detsembril Pauluse kirikus Tartus ja 28. detsembril Rootsi- Mihkli kirikus Tallinnas. Kaastegevad Tartu Ülikooli Kammerkoor (Tartus) ja kammerkoor Voces Musicales (Tallinnas). Kunstiline juht Olari Elts

  7. Canonical Ensemble Model for Black Hole Radiation

    Indian Academy of Sciences (India)

    Jingyi Zhang

    2014-09-01

    In this paper, a canonical ensemble model for the black hole quantum tunnelling radiation is introduced. In this model the probability distribution function corresponding to the emission shell is calculated to second order. The formula of pressure and internal energy of the thermal system is modified, and the fundamental equation of thermodynamics is also discussed.

  8. A Hierarchical Bayes Ensemble Kalman Filter

    Science.gov (United States)

    Tsyrulnikov, Michael; Rakitko, Alexander

    2017-01-01

    A new ensemble filter that allows for the uncertainty in the prior distribution is proposed and tested. The filter relies on the conditional Gaussian distribution of the state given the model-error and predictability-error covariance matrices. The latter are treated as random matrices and updated in a hierarchical Bayes scheme along with the state. The (hyper)prior distribution of the covariance matrices is assumed to be inverse Wishart. The new Hierarchical Bayes Ensemble Filter (HBEF) assimilates ensemble members as generalized observations and allows ordinary observations to influence the covariances. The actual probability distribution of the ensemble members is allowed to be different from the true one. An approximation that leads to a practicable analysis algorithm is proposed. The new filter is studied in numerical experiments with a doubly stochastic one-variable model of "truth". The model permits the assessment of the variance of the truth and the true filtering error variance at each time instance. The HBEF is shown to outperform the EnKF and the HEnKF by Myrseth and Omre (2010) in a wide range of filtering regimes in terms of performance of its primary and secondary filters.

  9. Locally Accessible Information from Multipartite Ensembles

    Institute of Scientific and Technical Information of China (English)

    SONG Wei

    2009-01-01

    We present a universal Holevo-like upper bound on the locally accessible information for arbitrary multipartite ensembles.This bound allows us to analyze the indistinguishability of a set of orthogonal states under local operations and classical communication.We also derive the upper bound for the capacity of distributed dense coding with multipartite senders and multipartite receivers.

  10. Statistical theory of hierarchical avalanche ensemble

    OpenAIRE

    Olemskoi, Alexander I.

    1999-01-01

    The statistical ensemble of avalanche intensities is considered to investigate diffusion in ultrametric space of hierarchically subordinated avalanches. The stationary intensity distribution and the steady-state current are obtained. The critical avalanche intensity needed to initiate the global avalanche formation is calculated depending on noise intensity. The large time asymptotic for the probability of the global avalanche appearance is derived.

  11. Eigenstate Gibbs ensemble in integrable quantum systems

    Science.gov (United States)

    Nandy, Sourav; Sen, Arnab; Das, Arnab; Dhar, Abhishek

    2016-12-01

    The eigenstate thermalization hypothesis conjectures that for a thermodynamically large system in one of its energy eigenstates, the reduced density matrix describing any finite subsystem is determined solely by a set of relevant conserved quantities. In a chaotic quantum system, only the energy is expected to play that role and hence eigenstates appear locally thermal. Integrable systems, on the other hand, possess an extensive number of such conserved quantities and therefore the reduced density matrix requires specification of all the corresponding parameters (generalized Gibbs ensemble). However, here we show by unbiased statistical sampling of the individual eigenstates with a given finite energy density that the local description of an overwhelming majority of these states of even such an integrable system is actually Gibbs-like, i.e., requires only the energy density of the eigenstate. Rare eigenstates that cannot be represented by the Gibbs ensemble can also be sampled efficiently by our method and their local properties are then shown to be described by appropriately truncated generalized Gibbs ensembles. We further show that the presence of these rare eigenstates differentiates the model from the chaotic case and leads to the system being described by a generalized Gibbs ensemble at long time under a unitary dynamics following a sudden quench, even when the initial state is a typical (Gibbs-like) eigenstate of the prequench Hamiltonian.

  12. Marking up lattice QCD configurations and ensembles

    CERN Document Server

    Coddington, P; Maynard, C M; Pleiter, D; Yoshié, T

    2007-01-01

    QCDml is an XML-based markup language designed for sharing QCD configurations and ensembles world-wide via the International Lattice Data Grid (ILDG). Based on the latest release, we present key ingredients of the QCDml in order to provide some starting points for colleagues in this community to markup valuable configurations and submit them to the ILDG.

  13. Une sémiotique à refaire?

    Directory of Open Access Journals (Sweden)

    Eric Landowski

    2013-12-01

    Full Text Available Le récit, c’est ce qui nous sert à donner un peu de signification et de valeur à la vie, en dépit de ce qu’elle peut avoir d’insignifiant par sa monotonie ou d’insensé par son aspect chaotique. Mais indépendamment des significations portées les récits, il nous arrive parfois, face à autrui, à une oeuvre, à un paysage, d’être saisis par la présence d’un sens qui s’impose à notre intuition bien qu’il n’émane d’aucun discours constitué. Ce sens second, toute une littérature, de Proust à Musil, de Svevo à Woolf, s’est employée à le dire en inventant les formes d’écriture de ce qu’on peut appeler le discours de l’expérience. Distinct du vécu, ce discours a le pouvoir d’en capter le mouvement en restituant la dynamique du rapport aux choses, à autrui, à soi-même sur laquelle se fonde l’expérience du sens dans son émergence en acte. Pour construire une sémiotique qui permette d’en rendre compte, ni la grammaire narrative standard ni ses prolongements relatifs aux passions et à la tensivité ne fournissent les instruments nécessaires. Il convient donc de compléter l’appareil théorique dont nous disposons. C’est ce qui justifie le réexamen critique des notions de narrativité et de discursivité auquel procède cet article, ainsi que la proposition finale d’un modèle tenant compte de la diversité des régimes possibles de production du sens dans l’interaction.

  14. Ensemble-based Kalman Filters in Strongly Nonlinear Dynamics

    Institute of Scientific and Technical Information of China (English)

    Zhaoxia PU; Joshua HACKER

    2009-01-01

    This study examines the effectiveness of ensemble Kalman filters in data assimilation with the strongly nonlinear dynamics of the Lorenz-63 model, and in particular their use in predicting the regime transition that occurs when the model jumps from one basin of attraction to the other. Four configurations of the ensemble-based Kalman filtering data assimilation techniques, including the ensemble Kalman filter, ensemble adjustment Kalman filter, ensemble square root filter and ensemble transform Kalman filter, are evaluated with their ability in predicting the regime transition (also called phase transition) and also are compared in terms of their sensitivity to both observational and sampling errors. The sensitivity of each ensemble-based filter to the size of the ensemble is also examined.

  15. Global Ensemble Forecast System (GEFS) [2.5 Deg.

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Global Ensemble Forecast System (GEFS) is a weather forecast model made up of 21 separate forecasts, or ensemble members. The National Centers for Environmental...

  16. Space Applications for Ensemble Detection and Analysis Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Ensemble Detection is both a measurement technique and analysis tool. Like a prism that separates light into spectral bands, an ensemble detector mixes a signal with...

  17. 40 CFR 92.208 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 92.208 Section 92.208... POLLUTION FROM LOCOMOTIVES AND LOCOMOTIVE ENGINES Certification Provisions § 92.208 Certification. (a) This... the application for certification, test reports and data acquired from a freshly...

  18. 21 CFR 80.31 - Certification.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 1 2010-04-01 2010-04-01 false Certification. 80.31 Section 80.31 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL COLOR ADDITIVE CERTIFICATION Certification Procedures § 80.31 Certification. (a) If the Commissioner determines, after...

  19. 16 CFR 306.6 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 16 Commercial Practices 1 2010-01-01 2010-01-01 false Certification. 306.6 Section 306.6... RATINGS, CERTIFICATION AND POSTING Duties of Refiners, Importers and Producers § 306.6 Certification. In... half number equal to or less than the number determined by you. This letter of certification will...

  20. 40 CFR 91.208 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 91.208 Section 91.208... Certification. (a) In the application for certification a manufacturer must: (1) Submit a statement that the engines for which certification is requested will not, to the best of the manufacturer's belief, cause...

  1. 40 CFR 94.208 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 94.208 Section 94.208... EMISSIONS FROM MARINE COMPRESSION-IGNITION ENGINES Certification Provisions § 94.208 Certification. (a) If, after a review of the application for certification, test reports and data acquired from an engine...

  2. 40 CFR 92.306 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 92.306 Section 92.306... POLLUTION FROM LOCOMOTIVES AND LOCOMOTIVE ENGINES Certification Averaging, Banking, and Trading Provisions § 92.306 Certification. (a) In the application for certification a manufacturer or remanufacturer...

  3. 19 CFR 10.180 - Certification.

    Science.gov (United States)

    2010-04-01

    ... 19 Customs Duties 1 2010-04-01 2010-04-01 false Certification. 10.180 Section 10.180 Customs... Frozen Beef § 10.180 Certification. (a) The foreign official's meat-inspection certificate required by U... certification below when fresh, chilled, or frozen beef is to be entered under the provisions of...

  4. 40 CFR 89.209 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 89.209 Section 89.209... Provisions § 89.209 Certification. (a) In the application for certification a manufacturer must: (1) Declare...) Submit a statement that the engines for which certification is requested will not, to the best of...

  5. 49 CFR 624.7 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 7 2010-10-01 2010-10-01 false Certification. 624.7 Section 624.7 Transportation... TRANSPORTATION CLEAN FUELS GRANT PROGRAM § 624.7 Certification. The applicant must use the certification contained in the Annual Notice of Assurances and Certifications published in the Federal Register...

  6. 2010 Guide to National Board Certification

    Science.gov (United States)

    National Board for Professional Teaching Standards, 2010

    2010-01-01

    This "Guide to National Board Certification" introduces teachers to the assessment process and provides them with useful information as they apply for National Board Certification or certification renewal, or order the "Take One!"[R] professional development kit. By participating in the National Board Certification process, teachers are joining…

  7. 5 CFR 1639.24 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 5 Administrative Personnel 3 2010-01-01 2010-01-01 false Certification. 1639.24 Section 1639.24... Certification. (a) The Board will provide a certification to the paying agency in all cases in which: (1) The... to appear at a hearing. (b) The certification must be in writing and must include: (1) A...

  8. 7 CFR 1216.70 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 10 2010-01-01 2010-01-01 false Certification. 1216.70 Section 1216.70 Agriculture... INFORMATION ORDER Peanut Promotion, Research, and Information Order Certification of Peanut Producer Organizations § 1216.70 Certification. (a) Organizations receiving certification from the Secretary will...

  9. 40 CFR 90.208 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 90.208 Section 90.208... EMISSIONS FROM NONROAD SPARK-IGNITION ENGINES AT OR BELOW 19 KILOWATTS Certification Averaging, Banking, and Trading Provisions § 90.208 Certification. (a) In the application for certification a manufacturer...

  10. 26 CFR 1.43-3 - Certification

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 1 2010-04-01 2010-04-01 true Certification 1.43-3 Section 1.43-3 Internal... § 1.43-3 Certification (a) Petroleum engineer's certification of a project—(1) In general. A petroleum... requirements of section 43(c)(2)(A). A petroleum engineer's certification must be submitted for each...

  11. 5 CFR 179.208 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Certification. 179.208 Section 179.208... Salary Offset § 179.208 Certification. (a) OPM salary offset coordinator shall provide a certification to... certification must be in writing and must state: (1) That the employee owes the debt; (2) The amount and...

  12. 46 CFR 107.258 - Crane certification.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Crane certification. 107.258 Section 107.258 Shipping... CERTIFICATION Inspection and Certification § 107.258 Crane certification. (a) The Coast Guard may accept current... West 44th Street, New York, NY 10036, on the Internet at http://www.icgb.com. (b) Crane...

  13. 40 CFR 94.306 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 94.306 Section 94.306... EMISSIONS FROM MARINE COMPRESSION-IGNITION ENGINES Certification Averaging, Banking, and Trading Provisions § 94.306 Certification. (a) In the application for certification a manufacturer must: (1) Declare...

  14. Un « Nouvel hygiénisme » ? Le bruit, l’odeur et l’émergence d’une new middle class

    Directory of Open Access Journals (Sweden)

    Laurent Matthey

    2005-10-01

    Full Text Available La tentation est grande aujourd’hui d’envisager un « Nouvel hygiénisme » qui façonnerait les espaces urbains et les corps. Cet article défend cependant l’hypothèse que ce qu’il est convenu d’appeler « Nouvel hygiénisme » est en fait un ensemble de pratiques sociales qui reposent sur la consommation ostentatoire et la distinction sociologique d’une classe sociale en ascension (la new middle class.

  15. Allergie respiratoire et “sunko”: une association rare, à propos d'une observation

    Science.gov (United States)

    Ngombe, Léon Kabamba; Kangulu, Ignace Bwana; Nzaji, Michel Kabamba

    2014-01-01

    Il est rapporté dans ce texte un cas d'allergie respiratoire ayant fait probablement suite à une consommation d'un tabac sans fumé couramment utilisé en République Démocratique du Congo, le « Sunko ». Une rhinite et un asthme allergiques sont les cas. Cette observation permet d'attirer l'attention du monde scientifique à mettre sur pieds des études concernant la composition et les effets du Sunko pour appréhender cette association, puis d'informer l'opinion sur les dangers que courent les consommateurs de ce type de tabac et de faire la revue de la littérature. PMID:25426218

  16. 77 FR 47117 - Chemical, Biological, Radiological, Nuclear (CBRN) Protective Ensemble Standard, Certification...

    Science.gov (United States)

    2012-08-07

    ... do not wish for it to be posted online, you must include the phrase ``CONFIDENTIAL BUSINESS... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF JUSTICE Office... made available for public inspection online. Such information includes personal ]...

  17. Hémothorax spontané révélant une vascularite de Wegener chez une femme enceinte

    Science.gov (United States)

    Serhane, Hind; Yassine, Msougar; Amro, Lamyae

    2016-01-01

    L’hémothorax spontané demeure une pathologie rare. Ses étiologies sont multiples mais restent parfois inconnues. Chez certains patients, la thoracotomie peut être le seul recours pour déterminer son origine. Les vascularites n’ont pas été rapporté comme cause habituelle des hémothorax spontanés. La grossesse ne semble pas avoir d’effet causal, ni aggravant des hémothorax spontanés, ni des vascularites. Nous rapportons une observation assez particulière d’une jeune patiente, présentant au cours de sa grossesse un hémothorax spontané secondaire à une vasularite de type Wegener, diagnostiquée par la biopsie pleurale faite au cours d’une thoracotomie exploratrice et confirmée par le dosage des ANCA. PMID:28154726

  18. Il était une fois... SYFILLIS

    OpenAIRE

    Chipeaux, Christophe; Rabemanantsoa, Tovo; Dayau, Sylvia; Deyris, Laetitia; Kruszewski, Alain; Lafont, Sebastien; Rougier, Quentin; Loustau, Denis; Wohl, Steven; WINGATE, Lisa

    2016-01-01

    L'objectif de ce résumé est de présenter SYFILLIS (SYstème de Flux de données ILLImité Spatialement). Après une première partie relative à l'infrastructure d'acquisition, nous développerons son architecture informatique puis nous exposerons les perspectives d’évolutions. L’infrastructure actuelle d'acquisition au sein des différents projets de l’unité ISPA (5 projets dont 3 européens) est composée de dispositifs hétéroclites (4 ordinateurs, 600 capteurs, 60 webcams et 40 centrales) réparti...

  19. Une fresque hagiographique sur Martin Luther King

    OpenAIRE

    Portes, Jacques

    2015-01-01

    Ce film est sorti en prévision du cinquantième anniversaire des grandes manifestations de Selma (Alabama) de janvier-mars 1965, qui ont débouché en juillet suivant sur le vote de la loi du droit de vote qui va assurer aux électeurs noirs l’accès au suffrage, dont ils étaient privés dans le Sud depuis la fin du XIXe siècle. « Selma » a mis en avant une fois de plus la personnalité de Martin Luther King, à la fois prudent et déterminé, dont le rôle précédent avait été largement reconnu par son ...

  20. Aleph : anatomie d'une experience

    CERN Multimedia

    Lynn Silverman

    1993-01-01

    "Aleph, anatomie d'une expérience" est un documentaire ethnologique sur les techniciens et les chercheurs de la physique des particules du Centre européen de recherche nucléaire, le CERN, près de Genève. Le film, dont le tournage s'est échelonné sur quatre années, de 1987 à 1991, retrace les différentes étapes de la mise en œuvre, sur le nouvel accélérateur (le LEP) du projet Aleph ; la construction des différents constituants du détecteur dans les centres de recherche de l'Europe entière, leur arrivée au CERN, l'assemblage… jusqu'à l'annonce des premiers résultats, obtenus en 1990.

  1. Ensembles of signal transduction models using Pareto Optimal Ensemble Techniques (POETs).

    Science.gov (United States)

    Song, Sang Ok; Chakrabarti, Anirikh; Varner, Jeffrey D

    2010-07-01

    Mathematical modeling of complex gene expression programs is an emerging tool for understanding disease mechanisms. However, identification of large models sometimes requires training using qualitative, conflicting or even contradictory data sets. One strategy to address this challenge is to estimate experimentally constrained model ensembles using multiobjective optimization. In this study, we used Pareto Optimal Ensemble Techniques (POETs) to identify a family of proof-of-concept signal transduction models. POETs integrate Simulated Annealing (SA) with Pareto optimality to identify models near the optimal tradeoff surface between competing training objectives. We modeled a prototypical-signaling network using mass-action kinetics within an ordinary differential equation (ODE) framework (64 ODEs in total). The true model was used to generate synthetic immunoblots from which the POET algorithm identified the 117 unknown model parameters. POET generated an ensemble of signaling models, which collectively exhibited population-like behavior. For example, scaled gene expression levels were approximately normally distributed over the ensemble following the addition of extracellular ligand. Also, the ensemble recovered robust and fragile features of the true model, despite significant parameter uncertainty. Taken together, these results suggest that experimentally constrained model ensembles could capture qualitatively important network features without exact parameter information.

  2. Deux comparatismes pour une anthropologie historique

    Directory of Open Access Journals (Sweden)

    Pierre-Olivier Dittmar

    2010-06-01

    Full Text Available Malgré des appels répétés depuis plus d’un siècle de la part des historiens, le comparatisme, qui est un élément majeur de l’anthropologie, demeure très peu pratiqué. Ce rejet est ici analysé comme un refus d’une quête des invariants de l’homme qui aboutirait à des résultats an-historiques. Un autre comparatisme est cependant possible, qui instrumentalise la confrontation des univers pour mieux relever les différences. C’est les conditions et les avantages d’une telle pratique qui sont ici exposés, à partir de l’exemple des tabous alimentaires.Despite the repeated calls by some historians for more than a century, many seldom practice a major element of anthropology: comparativism. This paper will analyze this rejection as a refusal to investigate the constants of the human experience that lead to a-historical conclusions. However, another kind of comparativism is possible, one that examines the contrast between cultures in order to better understand their differences. Using the case of dietary taboos, this paper will look at the conditions and advantages of such a practice.Nonostante i molteplici appelli da più di un secolo da parte degli storici, il comparatismo, che costituisce un elemento fondamentale dell’antropologia, è ancora oggi troppo poco spesso praticato. Si proporrà di interpretare questo rifiuto come un rifiuto della ricerca di invarianti umane che condurrebbe a risultati a-storici. Un’altra forma di comparatismo è nondimeno possibile, una forma precisamente che ricorre al confronto di universi diversi per meglio comprenderne le difference reciproche. L’articolo espone le condizioni e i vantaggi di questa metodologia di ricerca, a partire dall’esempio degli interdetti alimentari.

  3. Data assimilation in integrated hydrological modeling using ensemble Kalman filtering

    DEFF Research Database (Denmark)

    Rasmussen, Jørn; Madsen, H.; Jensen, Karsten Høgh;

    2015-01-01

    Groundwater head and stream discharge is assimilated using the ensemble transform Kalman filter in an integrated hydrological model with the aim of studying the relationship between the filter performance and the ensemble size. In an attempt to reduce the required number of ensemble members...

  4. Renewable Energy Certificate Program

    Energy Technology Data Exchange (ETDEWEB)

    Gwendolyn S. Andersen

    2012-07-17

    This project was primarily to develop and implement a curriculum which will train undergraduate and graduate students at the University seeking a degree as well as training for enrollees in a special certification program to prepare individuals to be employed in a broad range of occupations in the field of renewable energy and energy conservation. Curriculum development was by teams of Saint Francis University Faculty in the Business Administration and Science Departments and industry experts. Students seeking undergraduate and graduate degrees are able to enroll in courses offered within these departments which will combine theory and hands-on training in the various elements of wind power development. For example, the business department curriculum areas include economic modeling, finance, contracting, etc. The science areas include meteorology, energy conversion and projection, species identification, habitat protection, field data collection and analysis, etc.

  5. Une fistule recto-vaginale rentrant dans le cadre d�un syndrome de Currarino

    Directory of Open Access Journals (Sweden)

    Mounia Lakhdar Idrissi

    2011-12-01

    Full Text Available Le syndrome de Currarino (SC est defini par une triade rassemblant une malformation ano-rectale, une agenesie sacree et une tumeur pre-sacree. Nous rapportons le cas d�une fille de 4 ans et demi ayant ete admise en consultation de gastro-enterologie pediatrique pour constipation avec issue de selle a travers un orifice vulvaire. La radiographie du rachis avait montre une agenesie sacree. Le fistulo-scanner a mis en evidence une fistule recto-vaginale et l�IRM pelvienne a confirme l�agenesie sacree et a retrouve une meningocele anterieure. La decouverte d�une malformation ano-rectale doit faire chercher une autre anomalie de la triade de Currarino. Cette affection, rare, necessite une prise en charge medico-chirurgicale assez complexe.

  6. The role of ensemble post-processing for modeling the ensemble tail

    Science.gov (United States)

    Van De Vyver, Hans; Van Schaeybroeck, Bert; Vannitsem, Stéphane

    2016-04-01

    The past decades the numerical weather prediction community has witnessed a paradigm shift from deterministic to probabilistic forecast and state estimation (Buizza and Leutbecher, 2015; Buizza et al., 2008), in an attempt to quantify the uncertainties associated with initial-condition and model errors. An important benefit of a probabilistic framework is the improved prediction of extreme events. However, one may ask to what extent such model estimates contain information on the occurrence probability of extreme events and how this information can be optimally extracted. Different approaches have been proposed and applied on real-world systems which, based on extreme value theory, allow the estimation of extreme-event probabilities conditional on forecasts and state estimates (Ferro, 2007; Friederichs, 2010). Using ensemble predictions generated with a model of low dimensionality, a thorough investigation is presented quantifying the change of predictability of extreme events associated with ensemble post-processing and other influencing factors including the finite ensemble size, lead time and model assumption and the use of different covariates (ensemble mean, maximum, spread...) for modeling the tail distribution. Tail modeling is performed by deriving extreme-quantile estimates using peak-over-threshold representation (generalized Pareto distribution) or quantile regression. Common ensemble post-processing methods aim to improve mostly the ensemble mean and spread of a raw forecast (Van Schaeybroeck and Vannitsem, 2015). Conditional tail modeling, on the other hand, is a post-processing in itself, focusing on the tails only. Therefore, it is unclear how applying ensemble post-processing prior to conditional tail modeling impacts the skill of extreme-event predictions. This work is investigating this question in details. Buizza, Leutbecher, and Isaksen, 2008: Potential use of an ensemble of analyses in the ECMWF Ensemble Prediction System, Q. J. R. Meteorol

  7. Dialysis technicians' perception of certification.

    Science.gov (United States)

    Williams, Helen F; Garbin, Margery

    2015-03-01

    The Nephrology Nursing Certification Commission initiated this research project to study the viewpoint of dialysis technicians regarding the value of certification. A national convenience sample was obtained using both paper-and-pencil and online forms of the survey instrument. Demographic characteristics were obtained concerning age, race, ethnicity, education, and future employment planning. Technicians' primary work settings, the roles they fill, and the types of certification they hold are described. Incentives offered by employers are considered to explore how they contribute to job satisfaction. Understanding the perceptions of technicians regarding the benefits of certification and the limitations of workplace incentives should enable employers to improve their recruitment and retention programs. Information obtained may offer a baseline for future observations of the characteristics of these significant and essential contributors to the nephrology workforce.

  8. 76 FR 69801 - Conductor Certification

    Science.gov (United States)

    2011-11-09

    ... definition of ``conductor'' is a fundamental element of the conductor certification regulation and FRA does... and 219. G. Vision and Hearing Acuity BLET/UTU commented that proposed Sec. 242.117(k) should...

  9. Demonstrating the value of larger ensembles in forecasting physical systems

    Directory of Open Access Journals (Sweden)

    Reason L. Machete

    2016-12-01

    Full Text Available Ensemble simulation propagates a collection of initial states forward in time in a Monte Carlo fashion. Depending on the fidelity of the model and the properties of the initial ensemble, the goal of ensemble simulation can range from merely quantifying variations in the sensitivity of the model all the way to providing actionable probability forecasts of the future. Whatever the goal is, success depends on the properties of the ensemble, and there is a longstanding discussion in meteorology as to the size of initial condition ensemble most appropriate for Numerical Weather Prediction. In terms of resource allocation: how is one to divide finite computing resources between model complexity, ensemble size, data assimilation and other components of the forecast system. One wishes to avoid undersampling information available from the model's dynamics, yet one also wishes to use the highest fidelity model available. Arguably, a higher fidelity model can better exploit a larger ensemble; nevertheless it is often suggested that a relatively small ensemble, say ~16 members, is sufficient and that larger ensembles are not an effective investment of resources. This claim is shown to be dubious when the goal is probabilistic forecasting, even in settings where the forecast model is informative but imperfect. Probability forecasts for a ‘simple’ physical system are evaluated at different lead times; ensembles of up to 256 members are considered. The pure density estimation context (where ensemble members are drawn from the same underlying distribution as the target differs from the forecasting context, where one is given a high fidelity (but imperfect model. In the forecasting context, the information provided by additional members depends also on the fidelity of the model, the ensemble formation scheme (data assimilation, the ensemble interpretation and the nature of the observational noise. The effect of increasing the ensemble size is quantified by

  10. Dysonian dynamics of the Ginibre ensemble.

    Science.gov (United States)

    Burda, Zdzislaw; Grela, Jacek; Nowak, Maciej A; Tarnowski, Wojciech; Warchoł, Piotr

    2014-09-05

    We study the time evolution of Ginibre matrices whose elements undergo Brownian motion. The non-Hermitian character of the Ginibre ensemble binds the dynamics of eigenvalues to the evolution of eigenvectors in a nontrivial way, leading to a system of coupled nonlinear equations resembling those for turbulent systems. We formulate a mathematical framework allowing simultaneous description of the flow of eigenvalues and eigenvectors, and we unravel a hidden dynamics as a function of a new complex variable, which in the standard description is treated as a regulator only. We solve the evolution equations for large matrices and demonstrate that the nonanalytic behavior of the Green's functions is associated with a shock wave stemming from a Burgers-like equation describing correlations of eigenvectors. We conjecture that the hidden dynamics that we observe for the Ginibre ensemble is a general feature of non-Hermitian random matrix models and is relevant to related physical applications.

  11. Ensemble Forecasting of Major Solar Flares

    CERN Document Server

    Guerra, J A; Uritsky, V M

    2015-01-01

    We present the results from the first ensemble prediction model for major solar flares (M and X classes). Using the probabilistic forecasts from three models hosted at the Community Coordinated Modeling Center (NASA-GSFC) and the NOAA forecasts, we developed an ensemble forecast by linearly combining the flaring probabilities from all four methods. Performance-based combination weights were calculated using a Monte Carlo-type algorithm by applying a decision threshold $P_{th}$ to the combined probabilities and maximizing the Heidke Skill Score (HSS). Using the probabilities and events time series from 13 recent solar active regions (2012 - 2014), we found that a linear combination of probabilities can improve both probabilistic and categorical forecasts. Combination weights vary with the applied threshold and none of the tested individual forecasting models seem to provide more accurate predictions than the others for all values of $P_{th}$. According to the maximum values of HSS, a performance-based weights ...

  12. Rotationally invariant ensembles of integrable matrices

    Science.gov (United States)

    Yuzbashyan, Emil A.; Shastry, B. Sriram; Scaramazza, Jasen A.

    2016-05-01

    We construct ensembles of random integrable matrices with any prescribed number of nontrivial integrals and formulate integrable matrix theory (IMT)—a counterpart of random matrix theory (RMT) for quantum integrable models. A type-M family of integrable matrices consists of exactly N -M independent commuting N ×N matrices linear in a real parameter. We first develop a rotationally invariant parametrization of such matrices, previously only constructed in a preferred basis. For example, an arbitrary choice of a vector and two commuting Hermitian matrices defines a type-1 family and vice versa. Higher types similarly involve a random vector and two matrices. The basis-independent formulation allows us to derive the joint probability density for integrable matrices, similar to the construction of Gaussian ensembles in the RMT.

  13. Rotationally invariant ensembles of integrable matrices.

    Science.gov (United States)

    Yuzbashyan, Emil A; Shastry, B Sriram; Scaramazza, Jasen A

    2016-05-01

    We construct ensembles of random integrable matrices with any prescribed number of nontrivial integrals and formulate integrable matrix theory (IMT)-a counterpart of random matrix theory (RMT) for quantum integrable models. A type-M family of integrable matrices consists of exactly N-M independent commuting N×N matrices linear in a real parameter. We first develop a rotationally invariant parametrization of such matrices, previously only constructed in a preferred basis. For example, an arbitrary choice of a vector and two commuting Hermitian matrices defines a type-1 family and vice versa. Higher types similarly involve a random vector and two matrices. The basis-independent formulation allows us to derive the joint probability density for integrable matrices, similar to the construction of Gaussian ensembles in the RMT.

  14. Quantum data compression of a qubit ensemble.

    Science.gov (United States)

    Rozema, Lee A; Mahler, Dylan H; Hayat, Alex; Turner, Peter S; Steinberg, Aephraim M

    2014-10-17

    Data compression is a ubiquitous aspect of modern information technology, and the advent of quantum information raises the question of what types of compression are feasible for quantum data, where it is especially relevant given the extreme difficulty involved in creating reliable quantum memories. We present a protocol in which an ensemble of quantum bits (qubits) can in principle be perfectly compressed into exponentially fewer qubits. We then experimentally implement our algorithm, compressing three photonic qubits into two. This protocol sheds light on the subtle differences between quantum and classical information. Furthermore, since data compression stores all of the available information about the quantum state in fewer physical qubits, it could allow for a vast reduction in the amount of quantum memory required to store a quantum ensemble, making even today's limited quantum memories far more powerful than previously recognized.

  15. Eigenstate Gibbs Ensemble in Integrable Quantum Systems

    CERN Document Server

    Nandy, Sourav; Das, Arnab; Dhar, Abhishek

    2016-01-01

    The Eigenstate Thermalization Hypothesis implies that for a thermodynamically large system in one of its eigenstates, the reduced density matrix describing any finite subsystem is determined solely by a set of {\\it relevant} conserved quantities. In a generic system, only the energy plays that role and hence eigenstates appear locally thermal. Integrable systems, on the other hand, possess an extensive number of such conserved quantities and hence the reduced density matrix requires specification of an infinite number of parameters (Generalized Gibbs Ensemble). However, here we show by unbiased statistical sampling of the individual eigenstates with a given finite energy density, that the local description of an overwhelming majority of these states of even such an integrable system is actually Gibbs-like, i.e. requires only the energy density of the eigenstate. Rare eigenstates that cannot be represented by the Gibbs ensemble can also be sampled efficiently by our method and their local properties are then s...

  16. Entanglement in a Solid State Spin Ensemble

    CERN Document Server

    Simmons, Stephanie; Riemann, Helge; Abrosimov, Nikolai V; Becker, Peter; Pohl, Hans-Joachim; Thewalt, Mike L W; Itoh, Kohei M; Morton, John J L

    2010-01-01

    Entanglement is the quintessential quantum phenomenon and a necessary ingredient in most emerging quantum technologies, including quantum repeaters, quantum information processing (QIP) and the strongest forms of quantum cryptography. Spin ensembles, such as those in liquid state nuclear magnetic resonance, have been powerful in the development of quantum control methods, however, these demonstrations contained no entanglement and ultimately constitute classical simulations of quantum algorithms. Here we report the on-demand generation of entanglement between an ensemble of electron and nuclear spins in isotopically engineered phosphorus-doped silicon. We combined high field/low temperature electron spin resonance (3.4 T, 2.9 K) with hyperpolarisation of the 31P nuclear spin to obtain an initial state of sufficient purity to create a non-classical, inseparable state. The state was verified using density matrix tomography based on geometric phase gates, and had a fidelity of 98% compared with the ideal state a...

  17. Face Recognition using Optimal Representation Ensemble

    CERN Document Server

    Li, Hanxi; Gao, Yongsheng

    2011-01-01

    Recently, the face recognizers based on linear representations have been shown to deliver state-of-the-art performance. In real-world applications, however, face images usually suffer from expressions, disguises and random occlusions. The problematic facial parts undermine the validity of the linear-subspace assumption and thus the recognition performance deteriorates significantly. In this work, we address the problem in a learning-inference-mixed fashion. By observing that the linear-subspace assumption is more reliable on certain face patches rather than on the holistic face, some Bayesian Patch Representations (BPRs) are randomly generated and interpreted according to the Bayes' theory. We then train an ensemble model over the patch-representations by minimizing the empirical risk w.r.t the "leave-one-out margins". The obtained model is termed Optimal Representation Ensemble (ORE), since it guarantees the optimality from the perspective of Empirical Risk Minimization. To handle the unknown patterns in tes...

  18. Support Vector Machine Ensemble Based on Genetic Algorithm

    Institute of Scientific and Technical Information of China (English)

    LI Ye; YIN Ru-po; CAI Yun-ze; XU Xiao-ming

    2006-01-01

    Support vector machines (SVMs) have been introduced as effective methods for solving classification problems.However, due to some limitations in practical applications,their generalization performance is sometimes far from the expected level. Therefore, it is meaningful to study SVM ensemble learning. In this paper, a novel genetic algorithm based ensemble learning method, namely Direct Genetic Ensemble (DGE), is proposed. DGE adopts the predictive accuracy of ensemble as the fitness function and searches a good ensemble from the ensemble space. In essence, DGE is also a selective ensemble learning method because the base classifiers of the ensemble are selected according to the solution of genetic algorithm. In comparison with other ensemble learning methods, DGE works on a higher level and is more direct. Different strategies of constructing diverse base classifiers can be utilized in DGE.Experimental results show that SVM ensembles constructed by DGE can achieve better performance than single SVMs,bagged and boosted SVM ensembles. In addition, some valuable conclusions are obtained.

  19. Analysis and optimization of weighted ensemble sampling

    CERN Document Server

    Aristoff, David

    2016-01-01

    We give a mathematical framework for weighted ensemble (WE) sampling, a binning and resampling technique for efficiently computing probabilities in molecular dynamics. We prove that WE sampling is unbiased in a very general setting that includes adaptive binning. We show that when WE is used for stationary calculations in tandem with a Markov state model (MSM), the MSM can be used to optimize the allocation of replicas in the bins.

  20. Statistical Ensemble Theory of Gompertz Growth Model

    Directory of Open Access Journals (Sweden)

    Takuya Yamano

    2009-11-01

    Full Text Available An ensemble formulation for the Gompertz growth function within the framework of statistical mechanics is presented, where the two growth parameters are assumed to be statistically distributed. The growth can be viewed as a self-referential process, which enables us to use the Bose-Einstein statistics picture. The analytical entropy expression pertain to the law can be obtained in terms of the growth velocity distribution as well as the Gompertz function itself for the whole process.

  1. Quantum Data Compression of a Qubit Ensemble

    OpenAIRE

    Rozema, Lee A.; Mahler, Dylan H.; Hayat, Alex; Turner, Peter S.; Steinberg, Aephraim M.

    2014-01-01

    Data compression is a ubiquitous aspect of modern information technology, and the advent of quantum information raises the question of what types of compression are feasible for quantum data, where it is especially relevant given the extreme difficulty involved in creating reliable quantum memories. We present a protocol in which an ensemble of quantum bits (qubits) can in principle be perfectly compressed into exponentially fewer qubits. We then experimentally implement our algorithm, compre...

  2. Staying Thermal with Hartree Ensemble Approximations

    CERN Document Server

    Salle, M; Vink, Jeroen C

    2000-01-01

    Using Hartree ensemble approximations to compute the real time dynamics of scalar fields in 1+1 dimension, we find that with suitable initial conditions, approximate thermalization is achieved much faster than found in our previous work. At large times, depending on the interaction strength and temperature, the particle distribution slowly changes: the Bose-Einstein distribution of the particle densities develops classical features. We also discuss variations of our method which are numerically more efficient.

  3. Spatially Coupled Ensembles Universally Achieve Capacity under Belief Propagation

    CERN Document Server

    Kudekar, Shrinivas; Urbanke, Ruediger

    2012-01-01

    We investigate spatially coupled code ensembles. For transmission over the binary erasure channel, it was recently shown that spatial coupling increases the belief propagation threshold of the ensemble to essentially the maximum a-priori threshold of the underlying component ensemble. This explains why convolutional LDPC ensembles, originally introduced by Felstrom and Zigangirov, perform so well over this channel. We show that the equivalent result holds true for transmission over general binary-input memoryless output-symmetric channels. More precisely, given a desired error probability and a gap to capacity, we can construct a spatially coupled ensemble which fulfills these constraints universally on this class of channels under belief propagation decoding. In fact, most codes in that ensemble have that property. The quantifier universal refers to the single ensemble/code which is good for all channels but we assume that the channel is known at the receiver. The key technical result is a proof that under b...

  4. Various multistage ensembles for prediction of heating energy consumption

    Directory of Open Access Journals (Sweden)

    Radisa Jovanovic

    2015-04-01

    Full Text Available Feedforward neural network models are created for prediction of daily heating energy consumption of a NTNU university campus Gloshaugen using actual measured data for training and testing. Improvement of prediction accuracy is proposed by using neural network ensemble. Previously trained feed-forward neural networks are first separated into clusters, using k-means algorithm, and then the best network of each cluster is chosen as member of an ensemble. Two conventional averaging methods for obtaining ensemble output are applied; simple and weighted. In order to achieve better prediction results, multistage ensemble is investigated. As second level, adaptive neuro-fuzzy inference system with various clustering and membership functions are used to aggregate the selected ensemble members. Feedforward neural network in second stage is also analyzed. It is shown that using ensemble of neural networks can predict heating energy consumption with better accuracy than the best trained single neural network, while the best results are achieved with multistage ensemble.

  5. Ensemble transform sensitivity method for adaptive observations

    Science.gov (United States)

    Zhang, Yu; Xie, Yuanfu; Wang, Hongli; Chen, Dehui; Toth, Zoltan

    2016-01-01

    The Ensemble Transform (ET) method has been shown to be useful in providing guidance for adaptive observation deployment. It predicts forecast error variance reduction for each possible deployment using its corresponding transformation matrix in an ensemble subspace. In this paper, a new ET-based sensitivity (ETS) method, which calculates the gradient of forecast error variance reduction in terms of analysis error variance reduction, is proposed to specify regions for possible adaptive observations. ETS is a first order approximation of the ET; it requires just one calculation of a transformation matrix, increasing computational efficiency (60%-80% reduction in computational cost). An explicit mathematical formulation of the ETS gradient is derived and described. Both the ET and ETS methods are applied to the Hurricane Irene (2011) case and a heavy rainfall case for comparison. The numerical results imply that the sensitive areas estimated by the ETS and ET are similar. However, ETS is much more efficient, particularly when the resolution is higher and the number of ensemble members is larger.

  6. Multivariate localization methods for ensemble Kalman filtering

    Science.gov (United States)

    Roh, S.; Jun, M.; Szunyogh, I.; Genton, M. G.

    2015-12-01

    In ensemble Kalman filtering (EnKF), the small number of ensemble members that is feasible to use in a practical data assimilation application leads to sampling variability of the estimates of the background error covariances. The standard approach to reducing the effects of this sampling variability, which has also been found to be highly efficient in improving the performance of EnKF, is the localization of the estimates of the covariances. One family of localization techniques is based on taking the Schur (element-wise) product of the ensemble-based sample covariance matrix and a correlation matrix whose entries are obtained by the discretization of a distance-dependent correlation function. While the proper definition of the localization function for a single state variable has been extensively investigated, a rigorous definition of the localization function for multiple state variables that exist at the same locations has been seldom considered. This paper introduces two strategies for the construction of localization functions for multiple state variables. The proposed localization functions are tested by assimilating simulated observations experiments into the bivariate Lorenz 95 model with their help.

  7. Dynamic Analogue Initialization for Ensemble Forecasting

    Institute of Scientific and Technical Information of China (English)

    LI Shan; RONG Xingyao; LIU Yun; LIU Zhengyu; Klaus FRAEDRICH

    2013-01-01

    This paper introduces a new approach for the initialization of ensemble numerical forecasting:Dynamic Analogue Initialization (DAI).DAI assumes that the best model state trajectories for the past provide the initial conditions for the best forecasts in the future.As such,DAI performs the ensemble forecast using the best analogues from a full size ensemble.As a pilot study,the Lorenz63 and Lorenz96 models were used to test DAI's effectiveness independently.Results showed that DAI can improve the forecast significantly.Especially in lower-dimensional systems,DAI can reduce the forecast RMSE by ~50% compared to the Monte Carlo forecast (MC).This improvement is because DAI is able to recognize the direction of the analysis error through the embedding process and therefore selects those good trajectories with reduced initial error.Meanwhile,a potential improvement of DAI is also proposed,and that is to find the optimal range of embedding time based on the error's growing speed.

  8. Multivariate localization methods for ensemble Kalman filtering

    KAUST Repository

    Roh, S.

    2015-12-03

    In ensemble Kalman filtering (EnKF), the small number of ensemble members that is feasible to use in a practical data assimilation application leads to sampling variability of the estimates of the background error covariances. The standard approach to reducing the effects of this sampling variability, which has also been found to be highly efficient in improving the performance of EnKF, is the localization of the estimates of the covariances. One family of localization techniques is based on taking the Schur (element-wise) product of the ensemble-based sample covariance matrix and a correlation matrix whose entries are obtained by the discretization of a distance-dependent correlation function. While the proper definition of the localization function for a single state variable has been extensively investigated, a rigorous definition of the localization function for multiple state variables that exist at the same locations has been seldom considered. This paper introduces two strategies for the construction of localization functions for multiple state variables. The proposed localization functions are tested by assimilating simulated observations experiments into the bivariate Lorenz 95 model with their help.

  9. Gradient Flow Analysis on MILC HISQ Ensembles

    Energy Technology Data Exchange (ETDEWEB)

    Brown, Nathan [Washington U., St. Louis; Bazavov, Alexei [Brookhaven; Bernard, Claude [Washington U., St. Louis; DeTar, Carleton [Utah U.; Foley, Justin [Utah U.; Gottlieb, Steven [Indiana U.; Heller, Urs M. [APS, New York; Hetrick, J. E. [U. Pacific, Stockton; Komijani, Javad [Washington U., St. Louis; Laiho, Jack [Syracuse U.; Levkova, Ludmila [Utah U.; Oktay, M. B. [Utah U.; Sugar, Robert [UC, Santa Barbara; Toussaint, Doug [Arizona U.; Van de Water, Ruth S. [Fermilab; Zhou, Ran [Fermilab

    2014-11-14

    We report on a preliminary scale determination with gradient-flow techniques on the $N_f = 2 + 1 + 1$ HISQ ensembles generated by the MILC collaboration. The ensembles include four lattice spacings, ranging from 0.15 to 0.06 fm, and both physical and unphysical values of the quark masses. The scales $\\sqrt{t_0}/a$ and $w_0/a$ are computed using Symanzik flow and the cloverleaf definition of $\\langle E \\rangle$ on each ensemble. Then both scales and the meson masses $aM_\\pi$ and $aM_K$ are adjusted for mistunings in the charm mass. Using a combination of continuum chiral perturbation theory and a Taylor series ansatz in the lattice spacing, the results are simultaneously extrapolated to the continuum and interpolated to physical quark masses. Our preliminary results are $\\sqrt{t_0} = 0.1422(7)$fm and $w_0 = 0.1732(10)$fm. We also find the continuum mass-dependence of $w_0$.

  10. Multivariate localization methods for ensemble Kalman filtering

    Directory of Open Access Journals (Sweden)

    S. Roh

    2015-05-01

    Full Text Available In ensemble Kalman filtering (EnKF, the small number of ensemble members that is feasible to use in a practical data assimilation application leads to sampling variability of the estimates of the background error covariances. The standard approach to reducing the effects of this sampling variability, which has also been found to be highly efficient in improving the performance of EnKF, is the localization of the estimates of the covariances. One family of localization techniques is based on taking the Schur (entry-wise product of the ensemble-based sample covariance matrix and a correlation matrix whose entries are obtained by the discretization of a distance-dependent correlation function. While the proper definition of the localization function for a single state variable has been extensively investigated, a rigorous definition of the localization function for multiple state variables has been seldom considered. This paper introduces two strategies for the construction of localization functions for multiple state variables. The proposed localization functions are tested by assimilating simulated observations experiments into the bivariate Lorenz 95 model with their help.

  11. Multivariate localization methods for ensemble Kalman filtering

    KAUST Repository

    Roh, S.

    2015-05-08

    In ensemble Kalman filtering (EnKF), the small number of ensemble members that is feasible to use in a practical data assimilation application leads to sampling variability of the estimates of the background error covariances. The standard approach to reducing the effects of this sampling variability, which has also been found to be highly efficient in improving the performance of EnKF, is the localization of the estimates of the covariances. One family of localization techniques is based on taking the Schur (entry-wise) product of the ensemble-based sample covariance matrix and a correlation matrix whose entries are obtained by the discretization of a distance-dependent correlation function. While the proper definition of the localization function for a single state variable has been extensively investigated, a rigorous definition of the localization function for multiple state variables has been seldom considered. This paper introduces two strategies for the construction of localization functions for multiple state variables. The proposed localization functions are tested by assimilating simulated observations experiments into the bivariate Lorenz 95 model with their help.

  12. Interplanetary magnetic field ensemble at 1 AU

    Energy Technology Data Exchange (ETDEWEB)

    Matthaeus, W.H.; Goldstein, M.L.; King, J.H.

    1985-04-01

    A method for calculation ensemble averages from magnetic field data is described. A data set comprising approximately 16 months of nearly continuous ISEE-3 magnetic field data is used in this study. Individual subintervals of this data, ranging from 15 hours to 15.6 days comprise the ensemble. The sole condition for including each subinterval in the averages is the degree to which it represents a weakly time-stationary process. Averages obtained by this method are appropriate for a turbulence description of the interplanetary medium. The ensemble average correlation length obtained from all subintervals is found to be 4.9 x 10 to the 11th cm. The average value of the variances of the magnetic field components are in the approximate ratio 8:9:10, where the third component is the local mean field direction. The correlation lengths and variances are found to have a systematic variation with subinterval duration, reflecting the important role of low-frequency fluctuations in the interplanetary medium.

  13. Gradient Flow Analysis on MILC HISQ Ensembles

    CERN Document Server

    Bazavov, A; Brown, N; DeTar, C; Foley, J; Gottlieb, Steven; Heller, U M; Hetrick, J E; Komijani, J; Laiho, J; Levkova, L; Oktay, M; Sugar, R L; Toussaint, D; Van de Water, R S; Zhou, R

    2014-01-01

    We report on a preliminary scale determination with gradient-flow techniques on the $N_f = 2 + 1 + 1$ HISQ ensembles generated by the MILC collaboration. The ensembles include four lattice spacings, ranging from 0.15 to 0.06 fm, and both physical and unphysical values of the quark masses. The scales $\\sqrt{t_0}/a$ and $w_0/a$ are computed using Symanzik flow and the cloverleaf definition of $\\langle E \\rangle$ on each ensemble. Then both scales and the meson masses $aM_\\pi$ and $aM_K$ are adjusted for mistunings in the charm mass. Using a combination of continuum chiral perturbation theory and a Taylor series ansatz in the lattice spacing, the results are simultaneously extrapolated to the continuum and interpolated to physical quark masses. Our preliminary results are $\\sqrt{t_0} = 0.1422(7)$fm and $w_0 = 0.1732(10)$fm. We also find the continuum mass-dependence of $w_0$.

  14. On large deviations for ensembles of distributions

    Energy Technology Data Exchange (ETDEWEB)

    Khrychev, D A [Moscow State Institute of Radio-Engineering, Electronics and Automation (Technical University), Moscow (Russian Federation)

    2013-11-30

    The paper is concerned with the large deviations problem in the Freidlin-Wentzell formulation without the assumption of the uniqueness of the solution to the equation involving white noise. In other words, it is assumed that for each ε>0 the nonempty set P{sub ε} of weak solutions is not necessarily a singleton. Analogues of a number of concepts in the theory of large deviations are introduced for the set (P{sub ε}, ε>0), hereafter referred to as an ensemble of distributions. The ensembles of weak solutions of an n-dimensional stochastic Navier-Stokes system and stochastic wave equation with power-law nonlinearity are shown to be uniformly exponentially tight. An idempotent Wiener process in a Hilbert space and idempotent partial differential equations are defined. The accumulation points in the sense of large deviations of the ensembles in question are shown to be weak solutions of the corresponding idempotent equations. Bibliography: 14 titles.

  15. Cavity Cooling for Ensemble Spin Systems

    Science.gov (United States)

    Cory, David

    2015-03-01

    Recently there has been a surge of interest in exploring thermodynamics in quantum systems where dissipative effects can be exploited to perform useful work. One such example is quantum state engineering where a quantum state of high purity may be prepared by dissipative coupling through a cold thermal bath. This has been used to great effect in many quantum systems where cavity cooling has been used to cool mechanical modes to their quantum ground state through coupling to the resolved sidebands of a high-Q resonator. In this talk we explore how these techniques may be applied to an ensemble spin system. This is an attractive process as it potentially allows for parallel remove of entropy from a large number of quantum systems, enabling an ensemble to achieve a polarization greater than thermal equilibrium, and potentially on a time scale much shorter than thermal relaxation processes. This is achieved by the coupled angular momentum subspaces of the ensemble behaving as larger effective spins, overcoming the weak individual coupling of individual spins to a microwave resonator. Cavity cooling is shown to cool each of these subspaces to their respective ground state, however an additional algorithmic step or dissipative process is required to couple between these subspaces and enable cooling to the full ground state of the joint system.

  16. Une balle blanche dans un roman noir

    Directory of Open Access Journals (Sweden)

    Sophie Vallas

    2012-03-01

    Full Text Available En 1982, Paul Auster fit paraître, sous le pseudonyme de Paul Benjamin, un roman noir intitulé Squeeze Play. Ce roman présente la particularité d’appartenir également au genre du baseball novel, l’intrigue se déroulant en partie dans le monde du base-ball et sa résolution intervenant grâce à une manœuvre rare et spectaculaire (un double suicide squeeze qui éclaire l’enquête sous un jour nouveau. Cet article se propose d’analyser la place du base-ball dans Squeeze Play : élément essentiel de la structuration du roman, le base-ball permet également à Auster d’étudier le mythe du héros américain déchu dans une société dont toutes les dimensions (sportive, politique, privée sont gangrenées par la corruption et la perversion. La relation particulière qu’Auster tisse entre roman noir et baseball novel est également étudiée.In 1982 Paul Auster published a roman noir entitled Squeeze Play under the pseudonym of Paul Benjamin. The novel is also a “baseball novel”: its plot essentially deals with a baseball New York team and its former, fallen star, and the final resolution of the mystery intervenes thanks to a revelation brought by a baseball game in which a rather rare and spectacular maneuver (the double suicide squeeze is used by one of the teams to turn the tables and win the game. This paper analyzes the place of baseball in Squeeze Play: it first appears as an essential element in the very structure of the plot, but it is also, for Auster, a way of questioning the myth of the hero in an American society whose main aspects (sports, politics, private life are eaten up by corruption and perversion. The links Auster establishes between roman noir and baseball novel are also dealt with.

  17. Méthodologie de l'étude endocrinienne d'une espèce sauvage, l'Anguille

    Directory of Open Access Journals (Sweden)

    DUFOUR S.

    1994-10-01

    C'est la mise en oeuvre de tout un ensemble de méthodes d'investigation, allant de la mise au point des outils moléculaires (purifications d'hormones, obtention d'anticorps, dosages immunologiques, clonage, obtention de sondes... à la réalisation d'expériences in vitro (cultures de cellules, incubation ou périfusion d'organes et in vivo (ablations de glandes, traitements hormonaux, prélèvements sanguins... juqu'aux études sur le terrain, qui permet une approche complète et intégrée de l'endocrinologie de ce poisson.

  18. Le kyste hydatique du cordon spermatique : une localisation exceptionnelle

    Directory of Open Access Journals (Sweden)

    Mohamed Moncef Hamdane

    2011-12-01

    Full Text Available L� hydatidose est une anthropozoonose due au developpement chez l�homme de la forme larvaire du taenia Echinococcus granulosis. La plupart des kystes hydatiques se localisent dans le foie et les poumons. Le kyste hydatique du cordon spermatique est extremement rare avec seulement 4 cas rapportes dans la litterature. Les auteurs rapportent dans cet article un nouveau cas d�hydatidose du cordon spermatique. Il s�agissait d�un homme de 40 ans qui consultait pour des douleurs scrotales evoluant depuis huit mois. L�examen clinique a mis en evidence une tumefaction mobile, inguino-scrotale, droite. L�echographie testiculaire a objective une hernie inguinale droite associee a deux kystes epididymaires bilateraux. Le patient a ete opere pour cure de son hernie avec decouverte en per-operatoire d�un kyste du cordon spermatique qui a ete reseque. L�examen anatomopathologique a conclu a une hydatidose du cordon spermatique.

  19. Quand la biopsie cutanee peut etiqueter une epilepsie

    Directory of Open Access Journals (Sweden)

    Taoufiq Harmouch

    2011-10-01

    Full Text Available La maladie de Lafora (ML represente une forme rare et grave d�epilepsie myoclonique progressive. C�est une affection a transmission autosomique recessive, heterogene sur le plan genetique. Nous rapportons le cas d�une adolescente de 16 ans, issue de parents consanguins de premier degre, qui presente depuis l�age de 14 ans des crises d�epilepsie et des myoclonies. L'examen neurologique a montre un syndrome cerebelleux et une deterioration intellectuelle. La biopsie cutanee etait indispensable pour orienter le diagnostic. La ML a un pronostic constamment fatal. L�etude histologique confirme le diagnostic et l�etude moleculaire peut aider a etablir un conseil genetique.

  20. Commande optimisee d'un ensemble convertisseur-machine synchrone autopilotée fonctionnant en mode dégradé biphasé

    OpenAIRE

    Fan, Yuchao; Hautier, J.

    1994-01-01

    Cet article présente des marches dégradées optimisées applicables à un ensemble convertisseur-machine synchrone, lorsque des défauts de conduction apparaissent au niveau du convertisseur. Après analyse de l'influence d'un défaut de commande sur les caractéristiques de l'ensemble d'entraînement, une stratégie de rattrapage, en marche dégradée monophasée, est d'abord proposée pour pallier aux inconvénients de deux types de défauts lorsque le neutre de la machine est isolé. Dans ce mode de march...

  1. Une histoire de la physique moderne

    CERN Document Server

    Guillaud, Jean-Paul

    2010-01-01

    Vous étiez noyé dans les théorèmes et perdu dans vos cours de physique ? Et pourtant les informations sur les grands laboratoires de recherche explorant la matière vous intéressent et vous souhaiteriez en comprendre les enjeux ? Alors cet ouvrage de vulgarisation scientifique est pour vous. Ce livre dresse le plus simplement possible un panorama de la physique moderne en abordant : la relativité restreinte, la relativité générale, la physique quantique. Vous verrez : cette science n'est pas si hermétique et la profession de physicien est passionnante. La physique est au cœur de l'actualité avec la mise en service du nouvel accélérateur du CERN, le LHC, qui a fait la une de tous les médias. Ce livre prépare le lecteur à apprécier comme il se doit les découvertes à venir.

  2. Ensemble data assimilation with an adjusted forecast spread

    Directory of Open Access Journals (Sweden)

    Sabrina Rainwater

    2013-04-01

    Full Text Available Ensemble data assimilation typically evolves an ensemble of model states whose spread is intended to represent the algorithm's uncertainty about the state of the physical system that produces the data. The analysis phase treats the forecast ensemble as a random sample from a background distribution, and it transforms the ensemble according to the background and observation error statistics to provide an appropriate sample for the next forecast phase. We find that in the presence of model nonlinearity and model error, it can be fruitful to rescale the ensemble spread prior to the forecast and then reverse this rescaling after the forecast. We call this approach forecast spread adjustment, which we discuss and test in this article using an ensemble Kalman filter and a 2005 model due to Lorenz. We argue that forecast spread adjustment provides a tunable parameter, that is, complementary to covariance inflation, which cumulatively increases ensemble spread to compensate for underestimation of uncertainty. We also show that as the adjustment parameter approaches zero, the filter approaches the extended Kalman filter if the ensemble size is sufficiently large. We find that varying the adjustment parameter can significantly reduce analysis and forecast errors in some cases. We evaluate how the improvement provided by forecast spread adjustment depends on ensemble size, observation error and model error. Our results indicate that the technique is most effective for small ensembles, small observation error and large model error, though the effectiveness depends significantly on the nature of the model error.

  3. De praeceptis ferendis: good practice in multi-model ensembles

    Directory of Open Access Journals (Sweden)

    I. Kioutsioukis

    2014-06-01

    Full Text Available Ensembles of air quality models have been formally and empirically shown to outperform single models in many cases. Evidence suggests that ensemble error is reduced when the members form a diverse and accurate ensemble. Diversity and accuracy are hence two factors that should be taken care of while designing ensembles in order for them to provide better predictions. There exists a trade-off between diversity and accuracy for which one cannot be gained without expenses of the other. Theoretical aspects like the bias-variance-covariance decomposition and the accuracy-diversity decomposition are linked together and support the importance of creating ensemble that incorporates both the elements. Hence, the common practice of unconditional averaging of models without prior manipulation limits the advantages of ensemble averaging. We demonstrate the importance of ensemble accuracy and diversity through an inter-comparison of ensemble products for which a sound mathematical framework exists, and provide specific recommendations for model selection and weighting for multi model ensembles. To this end we have devised statistical tools that can be used for diagnostic evaluation of ensemble modelling products, complementing existing operational methods.

  4. Dorothée, une machine pour récupérer le pétrole.

    CERN Multimedia

    CERN Video Productions

    2010-01-01

    Dorothée est constituée de deux cylindres contrarotatifs montés parallèlement et formant aussi des flotteurs (diamètre 30 cm, longueur 2 m). La rotation motorisée des cylindres (par air comprimé pour une question de risque d'explosion) entraîne un film d'hydrocarbure. Le film adhérant sur les cylindres rotatifs est alors intercepté par un racleur qui le dévie dans un bac de récupération fixé au centre de la machine (80 litres) et qui est vidangé gravitairement et en permanence par une pompe immergée. Selon la viscosité des hydrocarbures, le débit de récupération est de 500 à 1000 litres par heure. L'ensemble en alliage d’aluminium flotte sur l'eau (200 kg) et est protégé par un capot pour éviter que des vagues d'eau viennent tomber dans le bac de récupération.

  5. AutoCAD 2014 review for certification official certification preparation

    CERN Document Server

    ASCENT center for technical knowledge

    2014-01-01

    The AutoCAD® 2014 Review for Certification book is intended for users of AutoCAD® preparing to complete the AutoCAD 2014 Certified Professional exam. This book contains a collection of relevant instructional topics, practice exercises, and review questions from the Autodesk Official Training Guides (AOTG) from ASCENT - Center for Technical Knowledge pertaining specifically to the Certified Professional exam topics and objectives. This book is intended for experienced users of AutoCAD in preparation for certification. New users of AutoCAD should refer to the AOTG training guides from ASCENT, such as AutoCAD/AutoCAD LT 2014 Fundamentals, for more comprehensive instruction.

  6. Une science du langage pour une science de l'humain

    Directory of Open Access Journals (Sweden)

    Jean-Paul Bronckart

    2011-01-01

    Full Text Available L'auteur de cet article propose d'abord une analyse de l'évolution des sciences du langage au cours des dernières décennies, qui fait apparaître la difficulté d'identifier un cadre épistémologique susceptible de se substituer au défunt programme chomskyen. Il soutient ensuite que l'enjeu central des sciences sociales est de comprendre comment s'est constitué, et comment se développe, l'espace gnoséologique proprement humain, et il examine à ce propos les apports des courants du cognitivisme, du constructivisme (de Piaget et de l'interactionnisme social. L'auteur procède alors à une description détaillée de divers apports des sciences du langage: la conception saussurienne du statut des signes ainsi que les rapports entre textes et langues; la conception de Volochinov du rôle des discours dans le développement social; les approches de l'architecture des textes. Sur ces bases, il démontre enfin en quoi les sciences du langage peuvent fournir un appui décisif aux sciences de l'homme.

  7. A Multivariate Empirical Orthogonal Function-Based Scheme for the Balanced Initial Ensemble Generation of an Ensemble Kalman Filter

    Institute of Scientific and Technical Information of China (English)

    ZHENG Fei; ZHU Jiang

    2010-01-01

    The initial ensemble perturbations for an ensemble data assimilation system are expected to reasonably sample model uncertainty at the time of analysis to further reduce analysis uncertainty.Therefore,the careful choice of an initial ensemble perturbation method that dynamically cycles ensemble perturbations is required for the optimal performance of the system.Based on the multivariate empirical onhogonal function(MEOF)method,a new ensemble initialization scheme is developed to generate balanced initial perturbations for the ensemble Kalman filter(EnKF)data assimilation,with a reasonable consideration of the physical relationships between different model variables.The scheme is applied in assimilation experiments with a global spectral atmospheric model and with real observations.The proposed perturbation method is compared to the commonly used method of spatially-correlated random perturbations.The comparisons show that the model uncertainties prior to the first analysis time,which are forecasted from the balanced ensemble initial fields,maintain a much more reasonable spread and a more accurate forecast error covariance than those from the randomly perturbed initial fields.The analysis results are further improved by the balanced ensemble initialization scheme due to more accurate background information.Also,a 20-day continuous assimilation experiment shows that the ensemble spreads for each model variable are still retained in reasonable ranges without considering additional perturbations or inflations during the assimilation cycles,while the ensemble spreads from the randomly perturbed initialization scheme decrease and collapse rapidly.

  8. 7 CFR 1570.1100 - Drawback certification.

    Science.gov (United States)

    2010-01-01

    ... OF AGRICULTURE EXPORT BONUS PROGRAMS SOAP and COAP Drawback Certification § 1570.1100 Drawback certification. An offer submitted by an exporter to FAS for an export bonus under the SOAP or the COAP...

  9. 7 CFR 205.404 - Granting certification.

    Science.gov (United States)

    2010-01-01

    ... Agriculture Regulations of the Department of Agriculture (Continued) AGRICULTURAL MARKETING SERVICE (Standards, Inspections, Marketing Practices), DEPARTMENT OF AGRICULTURE (CONTINUED) ORGANIC FOODS PRODUCTION ACT PROVISIONS NATIONAL ORGANIC PROGRAM Certification § 205.404 Granting certification. (a) Within a...

  10. Seasonal hydrological ensemble forecasts over Europe

    Science.gov (United States)

    Arnal, Louise; Wetterhall, Fredrik; Stephens, Elisabeth; Cloke, Hannah; Pappenberger, Florian

    2016-04-01

    This study investigates the limits of predictability in dynamical seasonal discharge forecasting, in both space and time, over Europe. Seasonal forecasts have an important socioeconomic value. Applications are numerous and cover hydropower management, spring flood prediction, low flow prediction for navigation and agricultural water demands. Additionally, the constant increase in NWP skill for longer lead times and the predicted increase in the intensity and frequency of hydro-meteorological extremes, have amplified the incentive to promote and further improve hydrological forecasts on sub-seasonal to seasonal timescales. In this study, seasonal hydrological forecasts (SEA), driven by the ECMWF's System 4 in hindcast mode, were analysed against an Ensemble Streamflow Prediction (ESP) benchmark. The ESP was forced with an ensemble of resampled historical meteorological observations and started with perfect initial conditions. Both forecasts were produced by the LISFLOOD model, run on the pan-European scale with a spatial resolution of 5 by 5 km. The forecasts were issued monthly on a daily time step, from 1990 until the current time, up to a lead time of 7 months. The seasonal discharge forecasts were analysed against the ESP on a catchment scale in terms of their accuracy, skill and sharpness, using a diverse set of verification metrics (e.g. KGE, CRPSS and ROC). Additionally, a reverse-ESP was constructed by forcing the LISFLOOD model with a single perfect meteorological set of observations and initiated from an ensemble of resampled historical initial conditions. The comparison of the ESP with the reverse-ESP approach enabled the identification of the respective contribution of meteorological forcings and hydrologic initial conditions errors to seasonal discharge forecasting uncertainties in Europe. These results could help pinpoint target elements of the forecasting chain which, after being improved, could lead to substantial increase in discharge predictability

  11. Une pratique intertextuelle d'Aragon

    Directory of Open Access Journals (Sweden)

    Hervé Bismuth

    1999-09-01

    Full Text Available L'écriture du poème implique un « Je » susceptible d'impliquer à son tour un « tu » qui n'est pas seulement le lecteur. C'est dans cette particularité énonciative que s'inscrit la pratique du poème-hommage, qui, dans la poésie moderne, est prétexte à des jeux intertextuels. Dans le poème Les Poètes, Aragon complique la pratique coutumière de ce dialogue intertextuel, en plaçant le lecteur dans la perspective d'une intertextualité infinie, stratégie qui peut se décrire par l'étude de trois pratiques nouvelles alors chez Aragon : la mise en icône, le jeu de piste et ce que j'appellerai l'intertextualité tierce. Dans ce poème dont le scripteur ne cesse de parler à la première personne, s'impose à travers ces trois pratiques, qui coexistent avec d'autres, bien plus traditionnelles, la perspective d'une intertextualité abyssale.Writing a poem implies the existence of the « I », who is likely to involve another « you » who is not only the reader. Within the framework of this particular enunciation lies the use of the homage-poem which provides modern poetry with a pretext for intertextual play. In the poem Les poètes, Aragon heightens the complexity of the usual intertextual dialogue, putting the reader in the perspective of infinite intertextuality. This strategy can be described by the study of three new practices in Aragon's work – icon-making, track games, and what I would call the third intertextuality. In this first-person poem, the perspective of abysmal intertextuality prevails through these three practices coexisting with other more traditional ones.La escritura del poema implica un « yo » susceptible de implicar a su vez un « tú » que no es únicamente el lector. Es dentro de esta particularidad enunciativa donde se sitúa la práctica del poema-homenaje, que, en la poesia moderna, sirve de pretexto a varios juegos intertextuales. En el poema Les Poètes, Aragon complica la pr

  12. Supervised Ensemble Classification of Kepler Variable Stars

    CERN Document Server

    Bass, Gideon

    2016-01-01

    Variable star analysis and classification is an important task in the understanding of stellar features and processes. While historically classifications have been done manually by highly skilled experts, the recent and rapid expansion in the quantity and quality of data has demanded new techniques, most notably automatic classification through supervised machine learning. We present an expansion of existing work on the field by analyzing variable stars in the {\\em Kepler} field using an ensemble approach, combining multiple characterization and classification techniques to produce improved classification rates. Classifications for each of the roughly 150,000 stars observed by {\\em Kepler} are produced separating the stars into one of 14 variable star classes.

  13. Accurate Atom Counting in Mesoscopic Ensembles

    CERN Document Server

    Hume, D B; Joos, M; Muessel, W; Strobel, H; Oberthaler, M K

    2013-01-01

    Many cold atom experiments rely on precise atom number detection, especially in the context of quantum-enhanced metrology where effects at the single particle level are important. Here, we investigate the limits of atom number counting via resonant fluorescence detection for mesoscopic samples of trapped atoms. We characterize the precision of these fluorescence measurements beginning from the single-atom level up to more than one thousand. By investigating the primary noise sources, we obtain single-atom resolution for atom numbers as high as 1200. This capability is an essential prerequisite for future experiments with highly entangled states of mesoscopic atomic ensembles.

  14. Cluster ensembles, quantization and the dilogarithm

    DEFF Research Database (Denmark)

    Fock, Vladimir; Goncharov, Alexander B.

    2009-01-01

    , possibly degenerate, and the space has a Poisson structure. The map is compatible with these structures. The dilogarithm together with its motivic and quantum avatars plays a central role in the cluster ensemble structure. We define a non-commutative -deformation of the -space. When is a root of unity...... group . It is an algebraic-geometric avatar of higher Teichmüller theory on related to . We suggest that there exists a duality between the and spaces. In particular, we conjecture that the tropical points of one of the spaces parametrise a basis in the space of functions on the Langlands dual space. We...

  15. Accurate Atom Counting in Mesoscopic Ensembles

    Science.gov (United States)

    Hume, D. B.; Stroescu, I.; Joos, M.; Muessel, W.; Strobel, H.; Oberthaler, M. K.

    2013-12-01

    Many cold atom experiments rely on precise atom number detection, especially in the context of quantum-enhanced metrology where effects at the single particle level are important. Here, we investigate the limits of atom number counting via resonant fluorescence detection for mesoscopic samples of trapped atoms. We characterize the precision of these fluorescence measurements beginning from the single-atom level up to more than one thousand. By investigating the primary noise sources, we obtain single-atom resolution for atom numbers as high as 1200. This capability is an essential prerequisite for future experiments with highly entangled states of mesoscopic atomic ensembles.

  16. Modeling Coordination Problems in a Music Ensemble

    DEFF Research Database (Denmark)

    Frimodt-Møller, Søren R.

    2008-01-01

    This paper considers in general terms, how musicians are able to coordinate through rational choices in a situation of (temporary) doubt in an ensemble performance. A fictitious example involving a 5-bar development in an unknown piece of music is analyzed in terms of epistemic logic, more...... specifically a multi-agent system, where it is shown that perfect coordination can only be certain to take place if the musicians have common knowledge of certain rules of the composition. We subsequently argue, however, that the musicians need not agree on the central features of the piece of music in order...

  17. Accurate atom counting in mesoscopic ensembles.

    Science.gov (United States)

    Hume, D B; Stroescu, I; Joos, M; Muessel, W; Strobel, H; Oberthaler, M K

    2013-12-20

    Many cold atom experiments rely on precise atom number detection, especially in the context of quantum-enhanced metrology where effects at the single particle level are important. Here, we investigate the limits of atom number counting via resonant fluorescence detection for mesoscopic samples of trapped atoms. We characterize the precision of these fluorescence measurements beginning from the single-atom level up to more than one thousand. By investigating the primary noise sources, we obtain single-atom resolution for atom numbers as high as 1200. This capability is an essential prerequisite for future experiments with highly entangled states of mesoscopic atomic ensembles.

  18. A Framework for Non-Equilibrium Statistical Ensemble Theory

    Institute of Scientific and Technical Information of China (English)

    BI Qiao; HE Zu-Tan; LIU Jie

    2011-01-01

    Since Gibbs synthesized a general equilibrium statistical ensemble theory, many theorists have attempted to generalized the Gibbsian theory to non-equilibrium phenomena domain, however the status of the theory of nonequilibrium phenomena can not be said as firm as well established as the Gibbsian ensemble theory. In this work, we present a framework for the non-equilibrium statistical ensemble formalism based on a subdynamic kinetic equation (SKE) rooted from the Brussels-Austin school and followed by some up-to-date works. The constructed key is to use a similarity transformation between Gibbsian ensembles formalism based on Liouville equation and the subdynamic ensemble formalism based on the SKE. Using this formalism, we study the spin-Boson system, as cases of weak coupling or strongly coupling, and obtain the reduced density operators for the Canonical ensembles easily.

  19. Data assimilation in integrated hydrological modeling using ensemble Kalman filtering

    DEFF Research Database (Denmark)

    Rasmussen, Jørn; Madsen, H.; Jensen, Karsten Høgh

    2015-01-01

    Groundwater head and stream discharge is assimilated using the ensemble transform Kalman filter in an integrated hydrological model with the aim of studying the relationship between the filter performance and the ensemble size. In an attempt to reduce the required number of ensemble members......, an adaptive localization method is used. The performance of the adaptive localization method is compared to the more common distance-based localization. The relationship between filter performance in terms of hydraulic head and discharge error and the number of ensemble members is investigated for varying...... and estimating parameters requires a much larger ensemble size than just assimilating groundwater head observations. However, the required ensemble size can be greatly reduced with the use of adaptive localization, which by far outperforms distance-based localization. The study is conducted using synthetic data...

  20. Une terreur par l’image

    Directory of Open Access Journals (Sweden)

    Annie DULONG

    2011-09-01

    Full Text Available Si d’autres événements — Hiroshima, la découverte des camps de concentration, la chute du mur de Berlin — ont, au cours du XXe siècle, marqué suffisamment l’imaginaire pour trouver leur réponse dans des œuvres d’art, le 11 septembre 2001 pose la question de la fictionnalisation autrement : il ne s’agit plus tant de combler les manques de la représentation, liés à l’absence d’images ou au délai dans leur dévoilement, mais bien de composer avec l’omniprésence d’une représentation martelée à la télévision et sur Internet. Que cette représentation soit partielle, tronquée et qu’il lui manque la présence des corps, ces grands absents des photographies et des images tournées par les journalistes, ne change rien au fait que c’est avec le trop-plein que les artistes doivent maintenant négocier.Cet article s’intéresse aux romans qui traitent l’événement de front au lieu de l’aborder sur un mode mineur, et a pour objectif de tracer un portrait de la représentation des médias dans les romans du 11 septembre 2001. Ces romans, outre le fait qu’ils traitent des événements de New York, ont comme point commun un personnage, ou décor : les médias, représentés par la télévision, l’Internet, les photographies de presse, interviennent dans les récits d’une manière significative et témoignent de la force brute des images. À travers une étude de certains des mécanismes à l’œuvre dans The Writing on the Wall (Lynne Sharon Schwartz, Extremely Loud and Incredibly Close (Jonathan Safran Foer, Falling Man (Don DeLillo et A Disorder Peculiar to the Country (Ken Kalfus, il s’agira de proposer des réponses à ces quelques questions : quel rôle les médias jouent-ils, et comment participent-ils au récit ? Quelle pression les images exercent-elles sur les personnages ? Que révèlent les personnages enfants dans leur rapport aux médias ? Quelle critique, finalement, les romans

  1. The Moment Convergence Rates for Largest Eigenvalues of β Ensembles

    Institute of Scientific and Technical Information of China (English)

    Jun Shan XIE

    2013-01-01

    The paper focuses on the largest eigenvalues of the β-Hermite ensemble and theβ-Laguerre ensemble.In particular,we obtain the precise moment convergence rates of their largest eigenvalues.The results are motivated by the complete convergence for partial sums of i.i.d.random variables,and the proofs depend on the small deviations for largest eigenvalues of the β ensembles and tail inequalities of the general β Tracy-Widom law.

  2. On sequential observation processing in localized ensemble Kalman filters

    OpenAIRE

    Nerger, Lars

    2014-01-01

    The different variants of current ensemble square-root Kalman filters assimilate either all observations at once or perform a sequence in which batches of observations or each single observation is assimilated. The sequential observation processing is used in filter algorithms like the ensemble adjustment Kalman filter (EAKF) and the ensemble square-root filter (EnSRF) and can result in computationally efficient algorithms because matrix inversions in the observation space are reduced to the ...

  3. Extracting Value from Ensembles for Cloud-Free Forecasting

    Science.gov (United States)

    2011-09-01

    for Medium range Weather Forecasting EMean Ensemble mean ETR Ensemble transform with rescaling EUMETSAT European Organization for the...transform method (ET) with rescaling ( ETR ) to define the initial atmospheric uncertainty (Wei et al. 2008). Adapted from the ET method devised by...variances of each grid point to further restrain the initial ensemble spread. The ETR method replaced the breeding method in GEFS during NCEP’s May

  4. Unconditional two-mode squeezing of separated atomic ensembles

    CERN Document Server

    Parkins, A S; Solano, E

    2005-01-01

    We propose schemes for the unconditional preparation of a two-mode squeezed state of effective bosonic modes realized in a pair of atomic ensembles interacting collectively with optical cavity and laser fields. The scheme uses Raman transitions between stable atomic ground states and under ideal conditions produces pure entangled states in the steady state. The scheme works both for ensembles confined within a single cavity and for ensembles confined in separate, cascaded cavities.

  5. Validation of the Air Force Weather Agency Ensemble Prediction Systems

    Science.gov (United States)

    2014-03-27

    to deterministic models. Results from ensemble weather input into operational risk management ( ORM ) destruction of enemy air defense simulations...growth during the analysis period (Toth and Kalnay, 1993; Toth and Kalnay, 1997). From this framework the ensemble transform bred vector, ensemble...features. Each of its 10 members is run independently using different configurations in the framework of the Weather Research and Forecasting (WRF

  6. Pour une modélisation surfaciste de la flexion. Le cas de la conjugaison du français

    Directory of Open Access Journals (Sweden)

    Boyé Gilles

    2016-01-01

    Full Text Available Les descriptions de la morphologie flexionnelle des langues sont naturellement basées sur l’observation détaillée de l’ensemble des propriétés connues des systèmes en question mais quelle part de ces connaissances est accessible aux locuteurs ? Dans ce travail nous proposons une approche résolument basée sur des connaissances accessibles illustrée sur la conjugaison du français. Le modèle proposé ici vise à répondre à la question du remplissage des paradigmes (Paradigm Cell Filling Problem : Ackerman et al., 2009 à partir des connaissances lexicales présentes dans un lexique-échantillon et de l’inférence de connaissances flexionnelles dans le cadre de la théorie de l’information (Shannon, 1948. Notre analyse est basée sur l’observation classique que un paradigme flexionnel est un ensemble de formes toutes mutuellement reliées par des analogies. À partir de ce point, nous proposons un mécanisme de construction des connaissances flexionnelles et de remplissage des paradigmes.

  7. The MIP Ensemble Simulation: Local Ensemble Statistics in the Cosmic Web

    CERN Document Server

    Aragon-Calvo, M A

    2012-01-01

    Here we present a novel N-body simulation technique that allows us to compute ensemble statistics on a local basis, directly relating halo properties to their environment. This is achieved by the use of an ensemble simulation in which the otherwise independent realizations share the same fluctuations above a given cut-off scale. This produces a constrained ensemble where the LSS is common to all realizations while having an independent halo population. By generating a large number of semi-independent realizations we can effectively increase the local halo density by an arbitrary factor thus breaking the fundamental limit of the finite halo density (for a given halo mass range) determined by the halo mass function. This technique allows us to compute local ensemble statistics of the matter/halo distribution at a particular position in space, removing the intrinsic stochasticity in the halo formation process and directly relating halo properties to their environment. This is a major improvement over global desc...

  8. Ensemble-based forecasting at Horns Rev: Ensemble conversion and kernel dressing

    DEFF Research Database (Denmark)

    Pinson, Pierre; Madsen, Henrik

    . The obtained ensemble forecasts of wind power are then converted into predictive distributions with an original adaptive kernel dressing method. The shape of the kernels is driven by a mean-variance model, the parameters of which are recursively estimated in order to maximize the overall skill of obtained...

  9. Evaluating Tropical Cyclone Forecast Track Uncertainty Using A Grand Ensemble of Ensemble Prediction Systems

    Science.gov (United States)

    2011-09-01

    variable is appropriately sized for the region ( UCAR 2010). 4. An Isotropic Joint-Ensemble Majumdar and Finochio (2010) develop a probability circle...Forecasting, 22, 671–675. UCAR , cited 2010: NCEP Perturbation Method. [Available online at http://www.meted.ucar.edu/nwp/pcu2/ens_matrix

  10. 16 CFR 803.6 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 16 Commercial Practices 1 2010-01-01 2010-01-01 false Certification. 803.6 Section 803.6... HART-SCOTT-RODINO ANTITRUST IMPROVEMENTS ACT OF 1976 TRANSMITTAL RULES § 803.6 Certification. (a) The... section 7A(e) and § 803.20 shall be accompanied by a certification in the format appearing at the end...

  11. 47 CFR 76.1502 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 4 2010-10-01 2010-10-01 false Certification. 76.1502 Section 76.1502... CABLE TELEVISION SERVICE Open Video Systems § 76.1502 Certification. (a) An operator of an open video... certification prior to the commencement of service at such a point in time that would allow the...

  12. 14 CFR 217.7 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 4 2010-01-01 2010-01-01 false Certification. 217.7 Section 217.7 Aeronautics and Space OFFICE OF THE SECRETARY, DEPARTMENT OF TRANSPORTATION (AVIATION PROCEEDINGS) ECONOMIC... NONSCHEDULED SERVICES § 217.7 Certification. The certification for BTS Form 41 Schedule T-100(f) shall...

  13. 7 CFR 800.118 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 7 2010-01-01 2010-01-01 false Certification. 800.118 Section 800.118 Agriculture Regulations of the Department of Agriculture (Continued) GRAIN INSPECTION, PACKERS AND STOCKYARD... Services § 800.118 Certification. Official certificates shall be issued according to § 800.160....

  14. 31 CFR 800.202 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 3 2010-07-01 2010-07-01 false Certification. 800.202 Section 800... TAKEOVERS BY FOREIGN PERSONS Definitions § 800.202 Certification. (a) The term certification means a written... material respects, as it relates to: (i) The transaction, and (ii) The party providing the...

  15. 10 CFR 55.23 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 10 Energy 2 2010-01-01 2010-01-01 false Certification. 55.23 Section 55.23 Energy NUCLEAR REGULATORY COMMISSION (CONTINUED) OPERATORS' LICENSES Medical Requirements § 55.23 Certification. To certify... complete and sign NRC Form 396, “Certification of Medical Examination by Facility Licensee,” which can...

  16. 49 CFR 178.345-15 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 2 2010-10-01 2010-10-01 false Certification. 178.345-15 Section 178.345-15... Specifications for Containers for Motor Vehicle Transportation § 178.345-15 Certification. (a) At or before the time of delivery, the manufacturer of a cargo tank motor vehicle must provide certification...

  17. 14 CFR 183.13 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Certification. 183.13 Section 183.13 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) ADMINISTRATIVE REGULATIONS REPRESENTATIVES OF THE ADMINISTRATOR Certification of Representatives § 183.13 Certification....

  18. 40 CFR 86.007-30 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Certification. 86.007-30 Section 86...-Fueled and Methanol-Fueled Heavy-Duty Vehicles § 86.007-30 Certification. (a)(1)(i) If, after a review of... compliance with no more than one set of in-use and certification standards (or family emission limits,...

  19. 40 CFR 86.1848-01 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 19 2010-07-01 2010-07-01 false Certification. 86.1848-01 Section 86... Complete Otto-Cycle Heavy-Duty Vehicles § 86.1848-01 Certification. (a)(1) If, after a review of the... certificate of conformity. (2) If, after review of the manufacturer's application, request for...

  20. 33 CFR 135.215 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Certification. 135.215 Section... Financial Responsibility for Offshore Facilities § 135.215 Certification. (a) Applicants shall: (1) If the...) If any of the information submitted for certification is determined by the Fund Administrator to...

  1. 40 CFR 121.24 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 21 2010-07-01 2010-07-01 false Certification. 121.24 Section 121.24 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) WATER PROGRAMS STATE CERTIFICATION OF ACTIVITIES REQUIRING A FEDERAL LICENSE OR PERMIT Certification by the Administrator § 121.24...

  2. 40 CFR 89.122 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 89.122 Section 89.122... EMISSIONS FROM NEW AND IN-USE NONROAD COMPRESSION-IGNITION ENGINES Emission Standards and Certification Provisions § 89.122 Certification. (a) If, after a review of the manufacturer's application, request...

  3. 40 CFR 157.34 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 23 2010-07-01 2010-07-01 false Certification. 157.34 Section 157.34... REQUIREMENTS FOR PESTICIDES AND DEVICES Child-Resistant Packaging § 157.34 Certification. (a) General. (1) The... that the package meets the standards of § 157.32. (2) Certification must be submitted with...

  4. 49 CFR 178.338-19 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 2 2010-10-01 2010-10-01 false Certification. 178.338-19 Section 178.338-19... Specifications for Containers for Motor Vehicle Transportation § 178.338-19 Certification. (a) At or before the... the date (month, year) of certification. The registration numbers of the manufacturer, the...

  5. 21 CFR 1010.2 - Certification.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Certification. 1010.2 Section 1010.2 Food and... HEALTH PERFORMANCE STANDARDS FOR ELECTRONIC PRODUCTS: GENERAL General Provisions § 1010.2 Certification..., the certification that such product conforms to all applicable standards under this subchapter....

  6. 22 CFR 1421.13 - Certification.

    Science.gov (United States)

    2010-04-01

    ... 22 Foreign Relations 2 2010-04-01 2010-04-01 true Certification. 1421.13 Section 1421.13 Foreign Relations FOREIGN SERVICE LABOR RELATIONS BOARD; FEDERAL LABOR RELATIONS AUTHORITY; GENERAL COUNSEL OF THE... THIS SUBCHAPTER § 1421.13 Certification. Certification means the determination by the Board, its...

  7. 76 FR 16549 - ESBWR Design Certification

    Science.gov (United States)

    2011-03-24

    ...; ] NUCLEAR REGULATORY COMMISSION 10 CFR Part 52 RIN 3150-AI85 ESBWR Design Certification AGENCY: Nuclear... operate an ESBWR design may do so by referencing this design certification rule (DCR). The applicant for certification of the ESBWR design is GE-Hitachi Nuclear Energy (GEH). The public is invited to submit...

  8. 12 CFR 4.65 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 1 2010-01-01 2010-01-01 false Certification. 4.65 Section 4.65 Banks and...; Contracting for Goods and Services § 4.65 Certification. (a) Objective. To preserve the integrity and foster... MWOB certification received from another government agency whose definition of MWOB is...

  9. 5 CFR 2421.13 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 5 Administrative Personnel 3 2010-01-01 2010-01-01 false Certification. 2421.13 Section 2421.13... FEDERAL LABOR RELATIONS AUTHORITY MEANING OF TERMS AS USED IN THIS SUBCHAPTER § 2421.13 Certification. Certification means the determination by the Authority, its agents or representatives, of the results of...

  10. 19 CFR 10.584 - Certification.

    Science.gov (United States)

    2010-04-01

    ... 19 Customs Duties 1 2010-04-01 2010-04-01 false Certification. 10.584 Section 10.584 Customs... States Free Trade Agreement Import Requirements § 10.584 Certification. (a) General. An importer who makes a claim under § 10.583(b) of this subpart based on a certification of the importer, exporter,...

  11. 16 CFR 306.8 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 16 Commercial Practices 1 2010-01-01 2010-01-01 false Certification. 306.8 Section 306.8... RATINGS, CERTIFICATION AND POSTING Duties of Distributors § 306.8 Certification. If you are a distributor... with each transfer of automotive fuel, as outlined in § 306.6(a), or by using a letter of...

  12. 40 CFR 86.094-30 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Certification. 86.094-30 Section 86...-Fueled and Methanol-Fueled Heavy-Duty Vehicles § 86.094-30 Certification. (a)(1)(i) If, after a review of... of its franchise agreement with the manufacturer and the dealer certification requirements of §...

  13. 7 CFR 1730.26 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 11 2010-01-01 2010-01-01 false Certification. 1730.26 Section 1730.26 Agriculture... ELECTRIC SYSTEM OPERATIONS AND MAINTENANCE Operations and Maintenance Requirements § 1730.26 Certification. (a) Engineer's certification. Where provided for in the borrower's loan documents, RUS may...

  14. 12 CFR 517.6 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 5 2010-01-01 2010-01-01 false Certification. 517.6 Section 517.6 Banks and... Certification. In order to qualify as an Outreach Program participant, each business or contractor must either... Program Advocate a completed and signed ABELS Registration/Certification Form, as prescribed by the...

  15. 14 CFR 121.919 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Certification. 121.919 Section 121.919... AND OPERATORS FOR COMPENSATION OR HIRE: CERTIFICATION AND OPERATIONS OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS Advanced Qualification Program § 121.919 Certification. A...

  16. 42 CFR 411.373 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 2 2010-10-01 2010-10-01 false Certification. 411.373 Section 411.373 Public... Entities Furnishing Designated Health Services § 411.373 Certification. (a) Every request must include the following signed certification: “With knowledge of the penalties for false statements provided by 18...

  17. 40 CFR 68.185 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 15 2010-07-01 2010-07-01 false Certification. 68.185 Section 68.185... ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.185 Certification. (a) For Program 1 processes, the owner or operator shall submit in the RMP the certification statement provided in §...

  18. 7 CFR 29.9203 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false Certification. 29.9203 Section 29.9203 Agriculture... INSPECTION Policy Statement and Regulations Governing the Identification and Certification of Nonquota Tobacco Produced and Marketed in a Quota Area Definitions § 29.9203 Certification. The documentation...

  19. 46 CFR 349.3 - Certification criteria.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 8 2010-10-01 2010-10-01 false Certification criteria. 349.3 Section 349.3 Shipping... RIGHTS OF CERTAIN MERCHANT SEAMEN § 349.3 Certification criteria. The Administrator shall apply the... ordered to active duty. It shall be the responsibility of each applicant for certification to...

  20. 28 CFR 7.5 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 28 Judicial Administration 1 2010-07-01 2010-07-01 false Certification. 7.5 Section 7.5 Judicial Administration DEPARTMENT OF JUSTICE REWARDS FOR CAPTURE OF ESCAPED FEDERAL PRISONERS § 7.5 Certification. The claim letter required under § 7.4 shall contain the following certification immediately proceeding...

  1. 33 CFR 274.5 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Certification. 274.5 Section 274... PEST CONTROL PROGRAM FOR CIVIL WORKS PROJECTS Project Operation § 274.5 Certification. Under the... certification of pesticide applicators through its development of a single Government Agency Plan (GAP)....

  2. 49 CFR 178.337-18 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 2 2010-10-01 2010-10-01 false Certification. 178.337-18 Section 178.337-18... Specifications for Containers for Motor Vehicle Transportation § 178.337-18 Certification. (a) At or before the...) and (b) without the original date of certification stamped on the specification plate....

  3. 49 CFR 212.107 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 4 2010-10-01 2010-10-01 false Certification. 212.107 Section 212.107... Certification. (a) Scope. In the event the FRA and the State agency do not agree on terms for the participation... the Federal Railroad Safety Act of 1970, the State shall file an annual certification with respect...

  4. 40 CFR 90.108 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 90.108 Section 90.108... EMISSIONS FROM NONROAD SPARK-IGNITION ENGINES AT OR BELOW 19 KILOWATTS Emission Standards and Certification Provisions § 90.108 Certification. (a) If, after a review of the manufacturer's submitted...

  5. 16 CFR 309.11 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 16 Commercial Practices 1 2010-01-01 2010-01-01 false Certification. 309.11 Section 309.11... Manufacturers of Electric Vehicle Fuel Dispensing Systems § 309.11 Certification. (a) For non-liquid alternative.... This letter of certification will be good until you transfer non-liquid alternative vehicle fuel...

  6. 40 CFR 86.437-78 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Certification. 86.437-78 Section 86... Later New Motorcycles, General Provisions § 86.437-78 Certification. (a) New motorcycles produced by a... certification is sought) are covered by the following: (1) The manufacturer shall submit to the Administrator...

  7. 15 CFR 996.22 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false Certification. 996.22 Section 996.22... AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE QUALITY ASSURANCE AND CERTIFICATION REQUIREMENTS FOR NOAA HYDROGRAPHIC PRODUCTS AND SERVICES QUALITY ASSURANCE AND CERTIFICATION REQUIREMENTS...

  8. 16 CFR 1202.5 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 16 Commercial Practices 2 2010-01-01 2010-01-01 false Certification. 1202.5 Section 1202.5 Commercial Practices CONSUMER PRODUCT SAFETY COMMISSION CONSUMER PRODUCT SAFETY ACT REGULATIONS SAFETY STANDARD FOR MATCHBOOKS § 1202.5 Certification. Certification shall be in accordance with section 14(a)...

  9. Certification and the Branding of HRD

    Science.gov (United States)

    Carliner, Saul

    2012-01-01

    Although calls continue to establish certification, several certifications for human resource development (HRD) practitioners already exist, although none use the name HRD. This Forum explores what those certification programs are and what their availability means to the development of the HRD "brand" (the impressions of the service derived from…

  10. 40 CFR 91.108 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Certification. 91.108 Section 91.108... EMISSIONS FROM MARINE SPARK-IGNITION ENGINES Emission Standards and Certification Provisions § 91.108 Certification. (a) If, after a review of the manufacturer's submitted application, or with respect to...

  11. 47 CFR 2.907 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 1 2010-10-01 2010-10-01 false Certification. 2.907 Section 2.907... RULES AND REGULATIONS Equipment Authorization Procedures General Provisions § 2.907 Certification. (a) Certification is an equipment authorization issued by the Commission, based on representations and test...

  12. 40 CFR 124.53 - State certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 21 2010-07-01 2010-07-01 false State certification. 124.53 Section... FOR DECISIONMAKING Specific Procedures Applicable to NPDES Permits § 124.53 State certification. (a) Under CWA section 401(a)(1), EPA may not issue a permit until a certification is granted or waived...

  13. Alternative Certification Pathways: Filling a Gap?

    Science.gov (United States)

    Ludlow, Carlyn

    2013-01-01

    The purpose of this article is to examine the proliferation of alternative certification pathways through an analysis of the role and history of teacher certification and supply followed by a synthesis of national, regional, and state research studies on alternative routes to certification programs and a review of studies conducted on well-known…

  14. 40 CFR 86.1848-10 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 19 2010-07-01 2010-07-01 false Certification. 86.1848-10 Section 86... Complete Otto-Cycle Heavy-Duty Vehicles § 86.1848-10 Certification. Link to an amendment published at 75 FR....1843-01 and 86.1844-01. (2) The manufacturer must comply with all certification and in-use...

  15. 40 CFR 86.004-30 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Certification. 86.004-30 Section 86...-Fueled and Methanol-Fueled Heavy-Duty Vehicles § 86.004-30 Certification. Section 86.004-30 includes text... combination. Each certificate will certify compliance with no more than one set of in-use and...

  16. 16 CFR 309.13 - Certification.

    Science.gov (United States)

    2010-01-01

    ... 16 Commercial Practices 1 2010-01-01 2010-01-01 false Certification. 309.13 Section 309.13... Dispensing Systems § 309.13 Certification. (a) If you are a distributor of non-liquid alternative vehicle... with each transfer of fuel, as outlined in § 309.11(a)(1), or by using a letter of certification,...

  17. 2009 Guide to National Board Certification

    Science.gov (United States)

    National Board for Professional Teaching Standards, 2009

    2009-01-01

    The "Guide to National Board Certification" introduces teachers to the assessment process and provides them with useful information as they apply for National Board Certification or order the "Take One![R]" professional development kit. By participating in the National Board Certification process, participants are joining tens of thousands of…

  18. 47 CFR 90.549 - Transmitter certification.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false Transmitter certification. 90.549 Section 90...-775 and 793-805 MHz Bands § 90.549 Transmitter certification. Transmitters operated in the 763-775 MHz... its certification procedure as required by § 90.203....

  19. 40 CFR 85.1406 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Certification. 85.1406 Section 85.1406... POLLUTION FROM MOBILE SOURCES Urban Bus Rebuild Requirements § 85.1406 Certification. (a) Certification... of this chapter or an approved alternative test procedure prescribed under § 85.1414....

  20. 7 CFR 29.27 - Certificate.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false Certificate. 29.27 Section 29.27 Agriculture Regulations of the Department of Agriculture AGRICULTURAL MARKETING SERVICE (Standards, Inspections, Marketing... INSPECTION Regulations Definitions § 29.27 Certificate. A certificate issued under the Act and...

  1. 28 CFR 26.23 - Certification process.

    Science.gov (United States)

    2010-07-01

    ... 28 Judicial Administration 1 2010-07-01 2010-07-01 false Certification process. 26.23 Section 26.23 Judicial Administration DEPARTMENT OF JUSTICE DEATH SENTENCES PROCEDURES Certification Process for State Capital Counsel Systems § 26.23 Certification process. (a) An appropriate state official...

  2. 14 CFR 147.3 - Certificate required.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Certificate required. 147.3 Section 147.3 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) SCHOOLS AND OTHER CERTIFICATED AGENCIES AVIATION MAINTENANCE TECHNICIAN SCHOOLS General § 147.3 Certificate...

  3. 14 CFR 65.111 - Certificate required.

    Science.gov (United States)

    2010-01-01

    ... current certificated parachute rigger; (3) Is the person making the next parachute jump with that... next parachute jump with that parachute in a tandem parachute operation conducted under § 105.45(b)(1... CERTIFICATION: AIRMEN OTHER THAN FLIGHT CREWMEMBERS Parachute Riggers § 65.111 Certificate required. (a)...

  4. Certification of ICTs in Elections

    DEFF Research Database (Denmark)

    Schürmann, Carsten; Barrat, Jordi; Bolo, Eden;

    2015-01-01

    voting or tabulation systems. The key elements of quality control are certification and evaluation. Certification refers to the confirmation proof of compliance with a given standard. Evaluation is the most labour intensive part of the quality control process during which the requirements, designs......, reduce voter participation or even cause national unrest. Not all of these problems are avoidable, but in most cases, good quality control can significantly reduce the likelihood that they will occur. This book is a guide on how best to achieve quality control in election technologies, such as electronic...

  5. Open source systems security certification

    CERN Document Server

    Damiani, Ernesto; El Ioini, Nabil

    2009-01-01

    Open Source Advances in Computer Applications book series provides timely technological and business information for: Enabling Open Source Systems (OSS) to become an integral part of systems and devices produced by technology companies; Inserting OSS in the critical path of complex network development and embedded products, including methodologies and tools for domain-specific OSS testing (lab code available), plus certification of security, dependability and safety properties for complex systems; Ensuring integrated systems, including OSS, meet performance and security requirements as well as achieving the necessary certifications, according to the overall strategy of OSS usage on the part of the adopter

  6. Fractional exclusion statistics and the Random Matrix Boson Ensemble

    CERN Document Server

    Hernández-Quiroz, Saul; Benet, Luis; Flores, Jorge; Cocho, Germinal

    2012-01-01

    The k-body Gaussian Embedded Ensemble of Random Matrices is considered for N bosons distributed on two single-particle levels. When k = N, the ensemble is equivalent to the Gaussian Orthogonal Ensemble (GOE), and when k = 2 it corresponds to the Two-body Random Ensemble (TBRE) for bosons. It is shown that the energy spectrum leads to a rank function which is of the form of a discrete generalized beta distribution. The same distribution is obtained assuming N non-interacting quasiparticles that obey the fractional exclusion statistics introduced by Haldane two decades ago.

  7. Adiabatic Passage of Collective Excitations in Atomic Ensembles

    Institute of Scientific and Technical Information of China (English)

    LIYong; MIAOYuan-Xiu; SUNChang-Pu

    2004-01-01

    We describe a theoretical scheme that allows for transfer of quantum states of atomic collective excitation between two macroscopic atomic ensembles localized in two spatially-separated domains. The conception is based on the occurrence of double-exciton dark states due to the collective destructive quantum interference of the emissions from the two atomic ensembles. With an adiabatically coherence manipulation for the atom-field couplings by stimulated Rmann scattering, the dark states will extrapolate from an exciton state of an ensemble to that of another. This realizes the transport of quantum information among atomic ensembles.

  8. Adiabatic Passage of Collective Excitations in Atomic Ensembles

    Institute of Scientific and Technical Information of China (English)

    LI Yong; MIAO Yuan-Xiu; SUN Chang-Pu

    2004-01-01

    We describe a theoretical scheme that allows for transfer of quantum states of atomic collective excitation between two macroscopic atomic ensembles localized in two spatially-separated domains. The conception is based on the occurrence of double-exciton dark states due to the collective destructive quantum interference of the emissions from the two atomic ensembles. With an adiabatically coherence manipulation for the atom-field couplings by stimulated Ramann scattering, the dark states will extrapolate from an exciton state of an ensemble to that of another. This realizes the transport of quantum information among atomic ensembles.

  9. Bayesian ensemble refinement by replica simulations and reweighting.

    Science.gov (United States)

    Hummer, Gerhard; Köfinger, Jürgen

    2015-12-28

    We describe different Bayesian ensemble refinement methods, examine their interrelation, and discuss their practical application. With ensemble refinement, the properties of dynamic and partially disordered (bio)molecular structures can be characterized by integrating a wide range of experimental data, including measurements of ensemble-averaged observables. We start from a Bayesian formulation in which the posterior is a functional that ranks different configuration space distributions. By maximizing this posterior, we derive an optimal Bayesian ensemble distribution. For discrete configurations, this optimal distribution is identical to that obtained by the maximum entropy "ensemble refinement of SAXS" (EROS) formulation. Bayesian replica ensemble refinement enhances the sampling of relevant configurations by imposing restraints on averages of observables in coupled replica molecular dynamics simulations. We show that the strength of the restraints should scale linearly with the number of replicas to ensure convergence to the optimal Bayesian result in the limit of infinitely many replicas. In the "Bayesian inference of ensembles" method, we combine the replica and EROS approaches to accelerate the convergence. An adaptive algorithm can be used to sample directly from the optimal ensemble, without replicas. We discuss the incorporation of single-molecule measurements and dynamic observables such as relaxation parameters. The theoretical analysis of different Bayesian ensemble refinement approaches provides a basis for practical applications and a starting point for further investigations.

  10. Hsaing Waing: Classical Ensemble of Myanmar

    Directory of Open Access Journals (Sweden)

    Chalermkit Kengkeaw

    2013-09-01

    Full Text Available Hsaing Waing is a classical music ensemble and a prominent culturalidentity of Myanmar. The Hsaing Waing ensemble consists of many instruments such as the Pat Waing, Muang Hsaing, Hne, Chauk Lon Bat, Byaung, Wa, Wallet Kok, Yakin, Si, and Mong. The earliest historical record of the Hsaing Waing is in 1544 where the Pat Waing and possibly the Hsaing Waing, was in royal service at the court of King Tabinshwehti of the Taungoo dynasty and prospered under the Kaunbaun dynasty up to colonial rule. During colonization, Hsaing Waing’s popularity declined but other innovations were introduced such as modern recording mediums and broadcasts which transferred the popularity of Hsaing Waing to a broader public audience and brought innovation to religious music, ceremonial rituals, fusion of westernmusical instruments such as the piano, violin and mandolin. The wealth of knowledge and numbers of connoisseur during the Kaunbaun dynasty led to the transfer of knowledge to many apprentices which were responsible for the development and adaptation and continuation of Hsaing Waing during colonization, socialism and independence. The transfer of knowledge was carried out by previous generations through apprentices, family members, close relatives and inspired individuals. The factors for the successful inheritance of Hsaing Waing are management, education, musicians and opportunity.

  11. Ensemble Kalman filtering with residual nudging

    Directory of Open Access Journals (Sweden)

    Xiaodong Luo

    2012-10-01

    Full Text Available Covariance inflation and localisation are two important techniques that are used to improve the performance of the ensemble Kalman filter (EnKF by (in effect adjusting the sample covariances of the estimates in the state space. In this work, an additional auxiliary technique, called residual nudging, is proposed to monitor and, if necessary, adjust the residual norms of state estimates in the observation space. In an EnKF with residual nudging, if the residual norm of an analysis is larger than a pre-specified value, then the analysis is replaced by a new one whose residual norm is no larger than a pre-specified value. Otherwise, the analysis is considered as a reasonable estimate and no change is made. A rule for choosing the pre-specified value is suggested. Based on this rule, the corresponding new state estimates are explicitly derived in case of linear observations. Numerical experiments in the 40-dimensional Lorenz 96 model show that introducing residual nudging to an EnKF may improve its accuracy and/or enhance its stability against filter divergence, especially in the small ensemble scenario.

  12. Ensemble Kalman filtering with residual nudging

    KAUST Repository

    Luo, X.

    2012-10-03

    Covariance inflation and localisation are two important techniques that are used to improve the performance of the ensemble Kalman filter (EnKF) by (in effect) adjusting the sample covariances of the estimates in the state space. In this work, an additional auxiliary technique, called residual nudging, is proposed to monitor and, if necessary, adjust the residual norms of state estimates in the observation space. In an EnKF with residual nudging, if the residual norm of an analysis is larger than a pre-specified value, then the analysis is replaced by a new one whose residual norm is no larger than a pre-specified value. Otherwise, the analysis is considered as a reasonable estimate and no change is made. A rule for choosing the pre-specified value is suggested. Based on this rule, the corresponding new state estimates are explicitly derived in case of linear observations. Numerical experiments in the 40-dimensional Lorenz 96 model show that introducing residual nudging to an EnKF may improve its accuracy and/or enhance its stability against filter divergence, especially in the small ensemble scenario.

  13. Deterministic Mean-Field Ensemble Kalman Filtering

    KAUST Repository

    Law, Kody J. H.

    2016-05-03

    The proof of convergence of the standard ensemble Kalman filter (EnKF) from Le Gland, Monbet, and Tran [Large sample asymptotics for the ensemble Kalman filter, in The Oxford Handbook of Nonlinear Filtering, Oxford University Press, Oxford, UK, 2011, pp. 598--631] is extended to non-Gaussian state-space models. A density-based deterministic approximation of the mean-field limit EnKF (DMFEnKF) is proposed, consisting of a PDE solver and a quadrature rule. Given a certain minimal order of convergence k between the two, this extends to the deterministic filter approximation, which is therefore asymptotically superior to standard EnKF for dimension d<2k. The fidelity of approximation of the true distribution is also established using an extension of the total variation metric to random measures. This is limited by a Gaussian bias term arising from nonlinearity/non-Gaussianity of the model, which arises in both deterministic and standard EnKF. Numerical results support and extend the theory.

  14. Nanobiosensing with Arrays and Ensembles of Nanoelectrodes

    Directory of Open Access Journals (Sweden)

    Najmeh Karimian

    2016-12-01

    Full Text Available Since the first reports dating back to the mid-1990s, ensembles and arrays of nanoelectrodes (NEEs and NEAs, respectively have gained an important role as advanced electroanalytical tools thank to their unique characteristics which include, among others, dramatically improved signal/noise ratios, enhanced mass transport and suitability for extreme miniaturization. From the year 2000 onward, these properties have been exploited to develop electrochemical biosensors in which the surfaces of NEEs/NEAs have been functionalized with biorecognition layers using immobilization modes able to take the maximum advantage from the special morphology and composite nature of their surface. This paper presents an updated overview of this field. It consists of two parts. In the first, we discuss nanofabrication methods and the principles of functioning of NEEs/NEAs, focusing, in particular, on those features which are important for the development of highly sensitive and miniaturized biosensors. In the second part, we review literature references dealing the bioanalytical and biosensing applications of sensors based on biofunctionalized arrays/ensembles of nanoelectrodes, focusing our attention on the most recent advances, published in the last five years. The goal of this review is both to furnish fundamental knowledge to researchers starting their activity in this field and provide critical information on recent achievements which can stimulate new ideas for future developments to experienced scientists.

  15. Cluster Ensemble-based Image Segmentation

    Directory of Open Access Journals (Sweden)

    Xiaoru Wang

    2013-07-01

    Full Text Available Image segmentation is the foundation of computer vision applications. In this paper, we propose a new\tcluster ensemble-based image\tsegmentation algorithm, which overcomes several problems of traditional methods. We make two main contributions in this paper. First, we introduce the cluster ensemble concept to fuse the segmentation results from different types of visual features effectively, which can deliver a better final result and achieve a much more stable performance for broad categories of images. Second, we exploit the PageRank idea from Internet applications and apply it to the image segmentation task. This can improve the final segmentation results by combining the spatial information of the image and the semantic similarity of regions. Our experiments on four public image databases validate the superiority of our algorithm over conventional single type of feature or multiple types of features-based algorithms, since our algorithm can fuse multiple types of features effectively for better segmentation results. Moreover, our method is also proved to be very competitive in comparison with other state-of-the-art segmentation algorithms.

  16. Effect of Doubling the Ensemble Size on the Performance of Ensemble Prediction in the Warm Season Using MOGREPS Implemented at the KMA

    Institute of Scientific and Technical Information of China (English)

    Jun Kyung KAY; Hyun Mee KIM; Young-Youn PARK; Joohyung SON

    2013-01-01

    Using the Met Office Global and Regional Ensemble Prediction System (MOGREPS) implemented at the Korea Meteorological Administration (KMA),the effect of doubling the ensemble size on the performance of ensemble prediction in the warm season was evaluated.Because a finite ensemble size causes sampling error in the full forecast probability distribution function (PDF),ensemble size is closely related to the efficiency of the ensemble prediction system.Prediction capability according to doubling the ensemble size was evaluated by increasing the number of ensembles from 24 to 48 in MOGREPS implemented at the KMA.The initial analysis perturbations generated by the Ensemble Transform Kalman Filter (ETKF) were integrated for 10 days from 22 May to 23 June 2009.Several statistical verification scores were used to measure the accuracy,reliability,and resolution of ensemble probabilistic forecasts for 24 and 48 ensemble member forecasts.Even though the results were not significant,the accuracy of ensemble prediction improved slightly as ensemble size increased,especially for longer forecast times in the Northern Hemisphere.While increasing the number of ensemble members resulted in a slight improvement in resolution as forecast time increased,inconsistent results were obtained for the scores assessing the reliability of ensemble prediction.The overall performance of ensemble prediction in terms of accuracy,resolution,and reliability increased slightly with ensemble size,especially for longer forecast times.

  17. Une restauration « spectaculaire »

    Directory of Open Access Journals (Sweden)

    Muriel Verbeeck-Boutin

    2010-04-01

    Full Text Available Cet article replace dans le contexte d’une époque la restauration d’une Vierge à l’enfant par Joseph Van der Veken. Documentée par le commanditaire, l’intervention ne répondit pas à son attente et déboucha sur une dérestauration. Ce fait, loin d’être anecdotique, témoigne d’une mutation des mentalités et des sensibilités dans la première moitié du vingtième siècle, et de l’émergence d’une nouvelle conception de la restauration.This article replaces the restoration of a Madonna and Child by Joseph Van der Vecken within the context of a period.Documented by the patron, the intervention did not meet his expectations and resulted in a de-restoration. This fact, far from being anecdotic, is proof of the change in mentalities and sensitivities in the first half of the twentieth century and of the emergence of a new concept of restoration

  18. La conscience environnementale, condition d’une puissance soutenable ?

    Directory of Open Access Journals (Sweden)

    François Gemenne

    2013-01-01

    Full Text Available Cette contribution ambitionne de montrer en quoi les crises environnementales représentent une menace pour la stabilité des Etats, et donc un élément de leur affaiblissement. L'article met ainsi en évidence la corrélation entre les dégradations – brutales ou graduelles – de l’environnement et les problèmes de sécurité intérieure, ainsi que les processus sous-jacents à cette corrélation. Dans une seconde partie, l'article examine, a contrario, en quoi le développement durable peut constituer la condition d’une puissance soutenable. Puissance diplomatique d’abord, avec le développement considérable des questions environnementales dans les relations internationales, notamment autour d’enjeux mondiaux comme le changement climatique. Puissance économique ensuite, à l’heure où beaucoup d’économistes érigent la croissance verte en modèle d’une nouvelle prospérité pour les pays industrialisés, et la considèrent comme une voie de développement porteuse pour les pays du Sud.

  19. Le pouvoir d’une reine

    Directory of Open Access Journals (Sweden)

    Charles Garcia

    2006-08-01

    Full Text Available Les Chroniques anonymes de Sahagún rapportent les événements survenus dans cette ville au début du règne d’Urraque Ire de León-Castille. Or, curieusement, cette souveraine occupe une place relativement effacée dans la narration, bien qu’elle soit souvent dépeinte sous un jour favorable. Il faut dire que la reine, qui suivit la politique que son père avait engagée, fut d’un soutien constant pour les moines. Dans la Crónica, la vision positive d’Urraque, en tant que femme au pouvoir, contraste avec l’image que donnent d’elle les chroniques post-alphonsines. C’est donc à partir du croisement de ces sources, mais aussi d’autres documents, que nous tenterons de recomposer la place de cette femme à la tête du royaume et que nous essaierons de percer l’intention de l’image que donne l’auteur anonyme d’un récit bâti dans un but d’édification.Las Crónicas anónimas de Sahagún cuentan los acontecimientos que acaecieron en dicha ciudad en los primeros años del reinado de Urraca I de León-Castilla. No deja de extrañar que la reina no sea la principal protagonista del relato, aunque suela salir bien parada en él. Bien es verdad que la soberana no hizo sino proseguir una política favorable para con los benedictinos de Domnos Sanctos, una línea que ya había iniciado su padre. En la Crónica anónima la imagen positiva de Urraca, como mujer que ha conseguido izarse hasta el poder, contrasta con la percepción que de ella nos presentan las crónicas post-alfonsíes. Cruzando pues dichas fuentes, con otros más documentos, intentaremos acercarnos al papel que esta mujer desempeñó al frente del reino, así como al retrato que de ella hace el cronista anónimo en un relato que escribió con clara intención ejemplificadora.

  20. Trusted Certificates in Quantum Cryptography

    OpenAIRE

    Perkins, William

    2006-01-01

    This paper analyzes the performance of Kak's three stage quantum cryptographic protocol based on public key cryptography against a man-in-the-middle attack. A method for protecting against such an attack is presented using certificates distributed by a trusted third party.

  1. Professional Certification in Counseling Psychology.

    Science.gov (United States)

    Fretz, Bruce R.; And Others

    1980-01-01

    Certification procedures protect consumers, but when licensing institutions become monopolistic, alternative paths to credentialing need to be considered. A series of articles examine third party payments, a changing job market and consumer protection concerns, all of which have had an impact on credentialing problems. (JAC)

  2. 75 FR 69165 - Conductor Certification

    Science.gov (United States)

    2010-11-10

    ... From the Federal Register Online via the Government Publishing Office ] Part II Department of Transportation Federal Railroad Administration 49 CFR Part 242 Conductor Certification; Proposed Rule #0;#0;Federal Register / Vol. 75, No. 217 / Wednesday, November 10, 2010 / Proposed Rules#0;#0; ] DEPARTMENT...

  3. Comment j'explore... une insuffisance cardiaque chronique

    OpenAIRE

    Ancion, Arnaud; Nellessen, Eric; Lancellotti, Patrizio; Pierard, Luc

    2011-01-01

    Une insuffisance cardiaque est définie par des critères précis associant signes cliniques et anomalies cardiaques. La recherche de signes et de symptômes doit être associée à la réalisation systématique d’un électrocardiogramme, d’une radiographie thoracique et d’un échocardiogramme afin de ne pas retarder le diagnostic et d’orienter le patient vers une mise au point adaptée. De nombreux tests complémentaires existent (cathétérisme, imagerie isotopique,…). Le but est de pouvoir asseoir précis...

  4. La syphilis congenitale revelee par une fracture spontanee

    Directory of Open Access Journals (Sweden)

    Mounia Lakhdar Idrissi

    2011-11-01

    Full Text Available Alors qu�elle est actuellement oubliee dans les pays developpes, la syphilis congenitale se voit encore chez nous faute du depistage antenatal. Ses formes cliniques sont polymorphes et orientent a tord vers d�autres pathologies surtout en periode neonatale. Le diagnostic n�est donc pas toujours facile. La revelation d�une syphilis congenitale par une fracture spontanee est exceptionnellement decrite. Nous rapportons dans ce travail le cas d�un nourrisson de 2 mois ramene en consultation pour limitation douloureuse des mouvements du bras droit. Le diagnostic est evoque sur les donnees radiologiques et confirme par la serologie syphilitique. Le traitement a repose essentiellement sur l�administration de la penicilline G avec une bonne evolution clinique.

  5. Sécurisation d'une Passerelle XML - SNMP

    OpenAIRE

    Collet, Laurent; Cridlig, Vincent

    2004-01-01

    ESIAL 2A. Rapport de stage.; Ce rapport présente l'implémentation d'extensions de sécurité pour une passerelle XML/SNMP. Le travail effectué se base sur une implémentation existante d'une telle passerelle et y ajoute des fonctionnalités pour établir un "continuum" de sécurité depuis les administrateurs réseaux jusqu'aux agents SNMP. Plusieurs mécanismes de sécurité ont été ajoutés : contrôle d'accès basé sur les rôles, authentification et confidentialité.

  6. Pouvoir pastoral, normalisation et soins infirmiers : une analyse foucaldienne

    Directory of Open Access Journals (Sweden)

    PATRICK MARTIN

    2010-04-01

    Full Text Available Des technologies répressives sont en place dans le but de contraindre, de soumettre, de normaliser et de diriger les intervenants qui travaillent dans le milieu de la santé. Parmi ces technologies, la confession en est une qui est largement utilisée. Le philosophe français Michel Foucault identifie la pratique confessionnelle comme permettant l’exercice d’une forme particulière de pouvoir qu’il qualifie de « pouvoir pastoral ». Le but de cet article est d’explorer de quelle manière la confession, à des fins de normalisation (pouvoir pastoral, est utilisée dans l’exercice de la profession infirmière. Pour ce faire, une attention particulière sera portée au concept foucaldien de pouvoir pastoral, à ses origines ainsi qu’à son application en soins infirmiers.

  7. An iterative ensemble Kalman filter for reservoir engineering applications

    NARCIS (Netherlands)

    Krymskaya, M.V.; Hanea, R.G.; Verlaan, M.

    2009-01-01

    The study has been focused on examining the usage and the applicability of ensemble Kalman filtering techniques to the history matching procedures. The ensemble Kalman filter (EnKF) is often applied nowadays to solving such a problem. Meanwhile, traditional EnKF requires assumption of the distributi

  8. Ensemble Forecast: A New Approach to Uncertainty and Predictability

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Ensemble techniques have been used to generate daily numerical weather forecasts since the 1990s in numerical centers around the world due to the increase in computation ability. One of the main purposes of numerical ensemble forecasts is to try to assimilate the initial uncertainty (initial error) and the forecast uncertainty (forecast error) by applying either the initial perturbation method or the multi-model/multiphysics method. In fact, the mean of an ensemble forecast offers a better forecast than a deterministic (or control) forecast after a short lead time (3 5 days) for global modelling applications. There is about a 1-2-day improvement in the forecast skill when using an ensemble mean instead of a single forecast for longer lead-time. The skillful forecast (65% and above of an anomaly correlation) could be extended to 8 days (or longer) by present-day ensemble forecast systems. Furthermore, ensemble forecasts can deliver a probabilistic forecast to the users, which is based on the probability density function (PDF)instead of a single-value forecast from a traditional deterministic system. It has long been recognized that the ensemble forecast not only improves our weather forecast predictability but also offers a remarkable forecast for the future uncertainty, such as the relative measure of predictability (RMOP) and probabilistic quantitative precipitation forecast (PQPF). Not surprisingly, the success of the ensemble forecast and its wide application greatly increase the confidence of model developers and research communities.

  9. Ensembles and their modules as objects of cartosemiotic inquiry

    Directory of Open Access Journals (Sweden)

    Hansgeorg Schlichtmann

    2010-01-01

    Full Text Available The structured set of signs in a map face -- here called map-face aggregate or MFA -- and the associated marginal notes make up an ensemble of modules or components (modular ensemble. Such ensembles are recognized where groups of entries are intuitively viewed as complex units, which includes the case that entries are consulted jointly and thus are involved in the same process of sign reception. Modular ensembles are amenable to semiotic study, just as are written or pictorial stories. Four kinds (one of them mentioned above are discussed in detail, two involving single MFAs, the other two being assemblages of maps, such as atlases. In terms of their internal structure, two types are recognized: the combinate (or grouping, in which modules are directly linked by combinatorial relations (example above, and the cumulate (or collection (of documents, in which modules are indirectly related through some conceptual commonality (example: series of geological maps. The discussion then turns to basic points concerning modular ensembles (identification of a module, internal organization of an ensemble, and characteristics which establish an ensemble as a unit and further to a few general semiotic concepts as they relate to the present research. Since this paper originated as a reaction to several of A. Wolodtschenko’s recent publications, it concludes with comments on some of his arguments which pertain to modular ensembles.

  10. Competitive Learning Neural Network Ensemble Weighted by Predicted Performance

    Science.gov (United States)

    Ye, Qiang

    2010-01-01

    Ensemble approaches have been shown to enhance classification by combining the outputs from a set of voting classifiers. Diversity in error patterns among base classifiers promotes ensemble performance. Multi-task learning is an important characteristic for Neural Network classifiers. Introducing a secondary output unit that receives different…

  11. Exact ensemble density-functional theory for excited states

    CERN Document Server

    Yang, Zeng-hui; Pribram-Jones, Aurora; Burke, Kieron; Needs, Richard J; Ullrich, Carsten A

    2014-01-01

    We construct exact Kohn-Sham potentials for the ensemble density-functional theory (EDFT) of excited states from the ground and excited states of helium. The exchange-correlation potential is compared with current approximations, which miss prominent features. The ensemble derivative discontinuity is tested, and the virial theorem is proven and illustrated.

  12. Ensemble Bayesian model averaging using Markov Chain Monte Carlo sampling

    NARCIS (Netherlands)

    Vrugt, J.A.; Diks, C.G.H.; Clark, M.

    2008-01-01

    Bayesian model averaging (BMA) has recently been proposed as a statistical method to calibrate forecast ensembles from numerical weather models. Successful implementation of BMA however, requires accurate estimates of the weights and variances of the individual competing models in the ensemble. In t

  13. A Comparison of Ensemble Kalman Filters for Storm Surge Assimilation

    KAUST Repository

    Altaf, Muhammad

    2014-08-01

    This study evaluates and compares the performances of several variants of the popular ensembleKalman filter for the assimilation of storm surge data with the advanced circulation (ADCIRC) model. Using meteorological data from Hurricane Ike to force the ADCIRC model on a domain including the Gulf ofMexico coastline, the authors implement and compare the standard stochastic ensembleKalman filter (EnKF) and three deterministic square root EnKFs: the singular evolutive interpolated Kalman (SEIK) filter, the ensemble transform Kalman filter (ETKF), and the ensemble adjustment Kalman filter (EAKF). Covariance inflation and localization are implemented in all of these filters. The results from twin experiments suggest that the square root ensemble filters could lead to very comparable performances with appropriate tuning of inflation and localization, suggesting that practical implementation details are at least as important as the choice of the square root ensemble filter itself. These filters also perform reasonably well with a relatively small ensemble size, whereas the stochastic EnKF requires larger ensemble sizes to provide similar accuracy for forecasts of storm surge.

  14. Building Identity in Collegiate Midlevel Choral Ensembles: The Director's Perspective

    Science.gov (United States)

    Major, Marci L.

    2017-01-01

    This study was designed to explore the director's perspective on the role organizational images play in social identity development in midlevel choral ensembles. Using a phenomenological methodology, I interviewed 10 current or former directors of midlevel choral ensembles from eight midwestern U.S. colleges and universities. Directors cited…

  15. Thermal Insulation Distribution Pattern of Layered Clothing Ensemble

    Institute of Scientific and Technical Information of China (English)

    李俊; 韦鸿发; 刘岩; 张渭源

    2004-01-01

    With a thermal manikin, the distribution pattern of thermal insulation in multi-layered clothing ensemble is studied. It is found that the thermal insulation of multi-layered clothing ensemble has certain statistical relationship with the thermal insulation of each layer, and the prediction equation has been established.

  16. Conductor and Ensemble Performance Expressivity and State Festival Ratings

    Science.gov (United States)

    Price, Harry E.; Chang, E. Christina

    2005-01-01

    This study is the second in a series examining the relationship between conducting and ensemble performance. The purpose was to further examine the associations among conductor, ensemble performance expressivity, and festival ratings. Participants were asked to rate the expressivity of video-only conducting and parallel audio-only excerpts from a…

  17. Calculation of the chemical potential in the Gibbs ensemble

    NARCIS (Netherlands)

    Smit, B.; Frenkel, D.

    1989-01-01

    An expression for the chemical potential in the Gibbs ensemble is derived. For finite system sizes this expression for the chemical potential differs system-atically from Widom's test particle insertion method for the N, V, T ensemble. In order to compare these two methods for calculating the chemic

  18. Modality-Driven Classification and Visualization of Ensemble Variance

    Energy Technology Data Exchange (ETDEWEB)

    Bensema, Kevin; Gosink, Luke; Obermaier, Harald; Joy, Kenneth I.

    2016-10-01

    Advances in computational power now enable domain scientists to address conceptual and parametric uncertainty by running simulations multiple times in order to sufficiently sample the uncertain input space. While this approach helps address conceptual and parametric uncertainties, the ensemble datasets produced by this technique present a special challenge to visualization researchers as the ensemble dataset records a distribution of possible values for each location in the domain. Contemporary visualization approaches that rely solely on summary statistics (e.g., mean and variance) cannot convey the detailed information encoded in ensemble distributions that are paramount to ensemble analysis; summary statistics provide no information about modality classification and modality persistence. To address this problem, we propose a novel technique that classifies high-variance locations based on the modality of the distribution of ensemble predictions. Additionally, we develop a set of confidence metrics to inform the end-user of the quality of fit between the distribution at a given location and its assigned class. We apply a similar method to time-varying ensembles to illustrate the relationship between peak variance and bimodal or multimodal behavior. These classification schemes enable a deeper understanding of the behavior of the ensemble members by distinguishing between distributions that can be described by a single tendency and distributions which reflect divergent trends in the ensemble.

  19. Effect of lateral boundary perturbations on the breeding method and the local ensemble transform Kalman filter for mesoscale ensemble prediction

    Directory of Open Access Journals (Sweden)

    Kazuo Saito

    2012-01-01

    Full Text Available The effect of lateral boundary perturbations (LBPs on the mesoscale breeding (MBD method and the local ensemble transform Kalman filter (LETKF as the initial perturbations generators for mesoscale ensemble prediction systems (EPSs was examined. A LBPs method using the Japan Meteorological Agency's (JMA's operational one-week global ensemble prediction was developed and applied to the mesoscale EPS of the Meteorological Research Institute for the World Weather Research Programme, Beijing 2008 Olympics Research and Development Project. The amplitude of the LBPs was adjusted based on the ensemble spread statistics considering the difference of the forecast times of the JMA's one-week EPS and the associated breeding/ensemble Kalman filter (EnKF cycles. LBPs in the ensemble forecast increase the ensemble spread and improve the accuracy of the ensemble mean forecast. In the MBD method, if LBPs were introduced in its breeding cycles, the growth rate of the generated bred vectors is increased, and the ensemble spread and the root mean square errors (RMSEs of the ensemble mean are further improved in the ensemble forecast. With LBPs in the breeding cycles, positional correspondences to the meteorological disturbances and the orthogonality of the bred vectors are improved. Brier Skill Scores (BSSs also showed a remarkable effect of LBPs in the breeding cycles. LBPs showed a similar effect with the LETKF. If LBPs were introduced in the EnKF data assimilation cycles, the ensemble spread, ensemble mean accuracy, and BSSs for precipitation were improved, although the relative advantage of LETKF as the initial perturbations generator against MDB was not necessarily clear. LBPs in the EnKF cycles contribute not to the orthogonalisation but to prevent the underestimation of the forecast error near the lateral boundary.The accuracy of the LETKF analyses was compared with that of the mesoscale 4D-VAR analyses. With LBPs in the LETKF cycles, the RMSEs of the

  20. China’s First Modern Dance Ensemble

    Institute of Scientific and Technical Information of China (English)

    1992-01-01

    After four years’hardwork by both Chineseand foreign artiststhe Guangdong ExperimentalModern Dance Ensemble,thefirst of its kind in China,wasestablished on June 6,1992,in the Friendship Theater ofGuangzhou.Ms、Yang Meiqi,a famous Chinese folk danceeducator,was chosen as headand Mr.Willy Tsao,a famousyoung Hongkong dancer,as artisticdirector.China’s Central TV Stationreported the news.Recommended by Ms.ChiangChing,a Chinese-American dancer,Yang Meiqi went to Durham,NorthCarolina,in the United States in thesummer of 1986.to attend the Amer-ican Dance Festival.The moderndances put on during the festivalfascinated her with their universal“language,”flexible movement,cho-reography and scientific training.“Isn’t this just What China’s dance

  1. ARM Cloud Retrieval Ensemble Data Set (ACRED)

    Energy Technology Data Exchange (ETDEWEB)

    Zhao, C; Xie, S; Klein, SA; McCoy, R; Comstock, JM; Delanoë, J; Deng, M; Dunn, M; Hogan, RJ; Jensen, MP; Mace, GG; McFarlane, SA; O’Connor, EJ; Protat, A; Shupe, MD; Turner, D; Wang, Z

    2011-09-12

    This document describes a new Atmospheric Radiation Measurement (ARM) data set, the ARM Cloud Retrieval Ensemble Data Set (ACRED), which is created by assembling nine existing ground-based cloud retrievals of ARM measurements from different cloud retrieval algorithms. The current version of ACRED includes an hourly average of nine ground-based retrievals with vertical resolution of 45 m for 512 layers. The techniques used for the nine cloud retrievals are briefly described in this document. This document also outlines the ACRED data availability, variables, and the nine retrieval products. Technical details about the generation of ACRED, such as the methods used for time average and vertical re-grid, are also provided.

  2. Nonlocal inhomogeneous broadening in plasmonic nanoparticle ensembles

    DEFF Research Database (Denmark)

    Tserkezis, Christos; Maack, Johan Rosenkrantz; Liu, Z.

    is to abandon the local response approximation (LRA) and take the nonlocal response of the metal into account, typically through the simple hydrodynamic Drude model (HDM), which predicts a sizedependent deviation of plasmon modes from the quasistatic (QS) limit. While this behaviour has been explored for simple...... metallic nanoparticles (NPs) or NP dimers, the possibility of inhomogeneous resonance broadening due to size variation in a large NP collection and the resulting spectral overlap of modes (as depicted in Fig. 1), has been so far overlooked. Here we study theoretically the effect of nonlocality on ensemble...... averaging through both HDM and the recent Generalized Nonlocal Optical Response (GNOR) theory, which apart from the resonance frequency shifts accounts successfully for size-dependent damping as well. We examine NPs made of either ideal Drude-like metals [of plasmon frequency (wavelength) ωp (λp...

  3. Predicting protein dynamics from structural ensembles

    CERN Document Server

    Copperman, J

    2015-01-01

    The biological properties of proteins are uniquely determined by their structure and dynamics. A protein in solution populates a structural ensemble of metastable configurations around the global fold. From overall rotation to local fluctuations, the dynamics of proteins can cover several orders of magnitude in time scales. We propose a simulation-free coarse-grained approach which utilizes knowledge of the important metastable folded states of the protein to predict the protein dynamics. This approach is based upon the Langevin Equation for Protein Dynamics (LE4PD), a Langevin formalism in the coordinates of the protein backbone. The linear modes of this Langevin formalism organize the fluctuations of the protein, so that more extended dynamical cooperativity relates to increasing energy barriers to mode diffusion. The accuracy of the LE4PD is verified by analyzing the predicted dynamics across a set of seven different proteins for which both relaxation data and NMR solution structures are available. Using e...

  4. Cendrars et Pilniak, une poignée de main

    OpenAIRE

    Khlopina, Oxana

    2014-01-01

    C’était en novembre 2001, lorsque les archives de Berne ouvrirent leurs portes à une jeune doctorante dont le seul avantage était de savoir lire le russe. Mon ambition était alors d’écrire une thèse sur Blaise Cendrars et la Russie, et je traquais le moindre détail qui les rapprochait, avec l’infatigable enthousiasme qu’on ne peut avoir qu’à vingt-deux ans. Le travail fut gratifiant, les preuves accusant Cendrars de russophilie étant très nombreuses. Les fiches de lectures, les lettres qui té...

  5. Vers une société multilingue ?

    OpenAIRE

    Klöter, Henning

    2007-01-01

    La renaissance, depuis une vingtaine d’années, de la langue de Taiwan (taiyu) représente un revirement significatif si l’on considère les mesures restrictives prises contre les langues régionales par le passé. Cet article compare le traitement accordé au taiyu par les organismes officiels à l’époque du Kuomintang (KMT) et sous le Parti démocrate progressiste (PDP). Nous mettrons l’accent sur les débats concernant la création d’une forme écrite de taiyu. Nous nous pencherons également sur les ...

  6. Induced Ginibre ensemble of random matrices and quantum operations

    CERN Document Server

    Fischmann, J; Khoruzhenko, B A; Sommers, H -J; Zyczkowski, K

    2011-01-01

    A generalisation of the Ginibre ensemble of non-Hermitian random square matrices is introduced. The corresponding probability measure is induced by the ensemble of rectangular Gaussian matrices via a quadratisation procedure. We derive the joint probability density of eigenvalues for such induced Ginibre ensemble and study various spectral correlation functions for complex and real matrices, and analyse universal behaviour in the limit of large dimensions. In this limit the eigenvalues of the induced Ginibre ensemble cover uniformly a ring in the complex plane. The real induced Ginibre ensemble is shown to be useful to describe statistical properties of evolution operators associated with random quantum operations, for which the dimensions of the input state and the output state do differ.

  7. Excitations and benchmark ensemble density functional theory for two electrons

    CERN Document Server

    Pribram-Jones, Aurora; Trail, John R; Burke, Kieron; Needs, Richard J; Ullrich, Carsten A

    2014-01-01

    A new method for extracting ensemble Kohn-Sham potentials from accurate excited state densities is applied to a variety of two electron systems, exploring the behavior of exact ensemble density functional theory. The issue of separating the Hartree energy and the choice of degenerate eigenstates is explored. A new approximation, spin eigenstate Hartree-exchange (SEHX), is derived. Exact conditions that are proven include the signs of the correlation energy components, the virial theorem for both exchange and correlation, and the asymptotic behavior of the potential for small weights of the excited states. Many energy components are given as a function of the weights for two electrons in a one-dimensional flat box, in a box with a large barrier to create charge transfer excitations, in a three-dimensional harmonic well (Hooke's atom), and for the He atom singlet-triplet ensemble, singlet-triplet-singlet ensemble, and triplet bi-ensemble.

  8. An educational model for ensemble streamflow simulation and uncertainty analysis

    Directory of Open Access Journals (Sweden)

    A. AghaKouchak

    2013-02-01

    Full Text Available This paper presents the hands-on modeling toolbox, HBV-Ensemble, designed as a complement to theoretical hydrology lectures, to teach hydrological processes and their uncertainties. The HBV-Ensemble can be used for in-class lab practices and homework assignments, and assessment of students' understanding of hydrological processes. Using this modeling toolbox, students can gain more insights into how hydrological processes (e.g., precipitation, snowmelt and snow accumulation, soil moisture, evapotranspiration and runoff generation are interconnected. The educational toolbox includes a MATLAB Graphical User Interface (GUI and an ensemble simulation scheme that can be used for teaching uncertainty analysis, parameter estimation, ensemble simulation and model sensitivity. HBV-Ensemble was administered in a class for both in-class instruction and a final project, and students submitted their feedback about the toolbox. The results indicate that this educational software had a positive impact on students understanding and knowledge of uncertainty in hydrological modeling.

  9. Ensemble inequivalence: Landau theory and the ABC model

    Science.gov (United States)

    Cohen, O.; Mukamel, D.

    2012-12-01

    It is well known that systems with long-range interactions may exhibit different phase diagrams when studied within two different ensembles. In many of the previously studied examples of ensemble inequivalence, the phase diagrams differ only when the transition in one of the ensembles is first order. By contrast, in a recent study of a generalized ABC model, the canonical and grand-canonical ensembles of the model were shown to differ even when they both exhibit a continuous transition. Here we show that the order of the transition where ensemble inequivalence may occur is related to the symmetry properties of the order parameter associated with the transition. This is done by analyzing the Landau expansion of a generic model with long-range interactions. The conclusions drawn from the generic analysis are demonstrated for the ABC model by explicit calculation of its Landau expansion.

  10. Emergence of overlap in ensembles of spatial multiplexes and statistical mechanics of spatial interacting networks ensembles

    CERN Document Server

    Halu, Arda; Bianconi, Ginestra

    2013-01-01

    Spatial networks range from the brain networks, to transportation networks and infrastructures. Recently interacting and multiplex networks are attracting great attention because their dynamics and robustness cannot be understood without treating at the same time several networks. Here we present maximal entropy ensembles of spatial multiplex and spatial interacting networks that can be used in order to model spatial multilayer network structures and to build null models of real datasets. We show that spatial multiplex naturally develop a significant overlap of the links, a noticeable property of many multiplexes that can affect significantly the dynamics taking place on them. Additionally, we characterize ensembles of spatial interacting networks and we analyse the structure of interacting airport and railway networks in India, showing the effect of space in determining the link probability.

  11. Les certifications en Espagnol Langue Étrangère sur le marché français

    OpenAIRE

    Meléndez Quero, Carlos

    2014-01-01

    Dans un contexte difficile, marqué par les contradictions des discours officiels exigeant des lauréats aux concours de recrutement des personnels enseignants des premier et second degrés l’obtention d’un certificat de langue étrangère de niveau B2 du Cadre européen commun de référence pour les langues, cet article présente une comparaison des quatre certifications acceptées actuellement par le Ministère de l’Éducation Nationale pour attester de la compétence en langue espagnole (CLES, DCL, BU...

  12. Le 18 Brumaire, une étape dans la constitution d’une armée nouvelle

    OpenAIRE

    Crépin, Annie

    2006-01-01

    Le 18 Brumaire, Bonaparte trouva un instrument de guerre entièrement forgé par la Révolution et le Directoire. Il devait de plus en plus s’éloigner des intentions initiales des créateurs d’une armée nouvelle. Celle-ci, pourtant, survécut au détournement de l’héritage que Bonaparte avait reçu en la matière tant elle était fondée sur des rapports nouveaux avec une nation et une société, elles aussi nouvelles, tant elle était en adéquation avec l’invention de la citoyenneté. 18 Brumaire, a Mi...

  13. Ensemble Bayesian forecasting system Part I: Theory and algorithms

    Science.gov (United States)

    Herr, Henry D.; Krzysztofowicz, Roman

    2015-05-01

    The ensemble Bayesian forecasting system (EBFS), whose theory was published in 2001, is developed for the purpose of quantifying the total uncertainty about a discrete-time, continuous-state, non-stationary stochastic process such as a time series of stages, discharges, or volumes at a river gauge. The EBFS is built of three components: an input ensemble forecaster (IEF), which simulates the uncertainty associated with random inputs; a deterministic hydrologic model (of any complexity), which simulates physical processes within a river basin; and a hydrologic uncertainty processor (HUP), which simulates the hydrologic uncertainty (an aggregate of all uncertainties except input). It works as a Monte Carlo simulator: an ensemble of time series of inputs (e.g., precipitation amounts) generated by the IEF is transformed deterministically through a hydrologic model into an ensemble of time series of outputs, which is next transformed stochastically by the HUP into an ensemble of time series of predictands (e.g., river stages). Previous research indicated that in order to attain an acceptable sampling error, the ensemble size must be on the order of hundreds (for probabilistic river stage forecasts and probabilistic flood forecasts) or even thousands (for probabilistic stage transition forecasts). The computing time needed to run the hydrologic model this many times renders the straightforward simulations operationally infeasible. This motivates the development of the ensemble Bayesian forecasting system with randomization (EBFSR), which takes full advantage of the analytic meta-Gaussian HUP and generates multiple ensemble members after each run of the hydrologic model; this auxiliary randomization reduces the required size of the meteorological input ensemble and makes it operationally feasible to generate a Bayesian ensemble forecast of large size. Such a forecast quantifies the total uncertainty, is well calibrated against the prior (climatic) distribution of

  14. Robust Ensemble Filtering and Its Relation to Covariance Inflation in the Ensemble Kalman Filter

    KAUST Repository

    Luo, Xiaodong

    2011-12-01

    A robust ensemble filtering scheme based on the H∞ filtering theory is proposed. The optimal H∞ filter is derived by minimizing the supremum (or maximum) of a predefined cost function, a criterion different from the minimum variance used in the Kalman filter. By design, the H∞ filter is more robust than the Kalman filter, in the sense that the estimation error in the H∞ filter in general has a finite growth rate with respect to the uncertainties in assimilation, except for a special case that corresponds to the Kalman filter. The original form of the H∞ filter contains global constraints in time, which may be inconvenient for sequential data assimilation problems. Therefore a variant is introduced that solves some time-local constraints instead, and hence it is called the time-local H∞ filter (TLHF). By analogy to the ensemble Kalman filter (EnKF), the concept of ensemble time-local H∞ filter (EnTLHF) is also proposed. The general form of the EnTLHF is outlined, and some of its special cases are discussed. In particular, it is shown that an EnKF with certain covariance inflation is essentially an EnTLHF. In this sense, the EnTLHF provides a general framework for conducting covariance inflation in the EnKF-based methods. Some numerical examples are used to assess the relative robustness of the TLHF–EnTLHF in comparison with the corresponding KF–EnKF method.

  15. Les travailleurs de la nature : une professionnalisation en tension

    Directory of Open Access Journals (Sweden)

    Arnaud Cosson

    2010-12-01

    Full Text Available En France, le développement des métiers de la nature est lié à une opposition, parfois violente, à la bureaucratie et au recours croissant à la technique. Pourtant, on constate aujourd’hui un mouvement de rationalisation, de technicisation et de professionnalisation de ces activités, bien loin de l’image mythifiée d’activités qui seraient caractérisées essentiellement par l’engagement, la passion ou la proximité au terrain. C’est ainsi l’alignement avec d’autres corps de métiers qui est mis en avant par les acteurs travaillant dans des espaces naturels qui témoignent de leur volonté de (se convaincre que leur activité constitue un « vrai travail », un « vrai métier ».En nous basant sur une enquête empirique complétant un ensemble de travaux antérieurs, nous éclairons la façon dont cette tension – entre passion et rationalisation, entre spécificité et alignement – s’exprime dans le vécu et les pratiques des professionnels de la nature en France. Nous explorons trois niveaux : celui des conditions de l’engagement dans le métier (tendues entre revendication de compétences et de qualifications et mise en avant d’une passion ; celui des figures et des identités professionnelles (prises entre figure de l’expert naturaliste et figure du médiateur ; celui des pratiques de travail (oscillant entre pratiques néo-manageriales et proximité à la nature.Ce faisant, nous esquissons les contours d’une forme de professionnalisation singulière et paradoxale, propre aux métiers de la nature, qui s’est construite sur une tension constitutive entre rationalisation et résistance à la rationalisation, entre alignement sur les standards d’autres professions et maintien d’une spécificité.Nature jobs: a professionalization under stressThe development of nature jobs in France is linked to a sometimes fierce opposition to bureaucracy and the rising resort to technology. However, these jobs

  16. Assessing the impact of land use change on hydrology by ensemble modelling (LUCHEM) II: Ensemble combinations and predictions

    Science.gov (United States)

    Viney, N.R.; Bormann, H.; Breuer, L.; Bronstert, A.; Croke, B.F.W.; Frede, H.; Graff, T.; Hubrechts, L.; Huisman, J.A.; Jakeman, A.J.; Kite, G.W.; Lanini, J.; Leavesley, G.; Lettenmaier, D.P.; Lindstrom, G.; Seibert, J.; Sivapalan, M.; Willems, P.

    2009-01-01

    This paper reports on a project to compare predictions from a range of catchment models applied to a mesoscale river basin in central Germany and to assess various ensemble predictions of catchment streamflow. The models encompass a large range in inherent complexity and input requirements. In approximate order of decreasing complexity, they are DHSVM, MIKE-SHE, TOPLATS, WASIM-ETH, SWAT, PRMS, SLURP, HBV, LASCAM and IHACRES. The models are calibrated twice using different sets of input data. The two predictions from each model are then combined by simple averaging to produce a single-model ensemble. The 10 resulting single-model ensembles are combined in various ways to produce multi-model ensemble predictions. Both the single-model ensembles and the multi-model ensembles are shown to give predictions that are generally superior to those of their respective constituent models, both during a 7-year calibration period and a 9-year validation period. This occurs despite a considerable disparity in performance of the individual models. Even the weakest of models is shown to contribute useful information to the ensembles they are part of. The best model combination methods are a trimmed mean (constructed using the central four or six predictions each day) and a weighted mean ensemble (with weights calculated from calibration performance) that places relatively large weights on the better performing models. Conditional ensembles, in which separate model weights are used in different system states (e.g. summer and winter, high and low flows) generally yield little improvement over the weighted mean ensemble. However a conditional ensemble that discriminates between rising and receding flows shows moderate improvement. An analysis of ensemble predictions shows that the best ensembles are not necessarily those containing the best individual models. Conversely, it appears that some models that predict well individually do not necessarily combine well with other models in

  17. Ensemble Kalman filtering without the intrinsic need for inflation

    Directory of Open Access Journals (Sweden)

    M. Bocquet

    2011-10-01

    Full Text Available The main intrinsic source of error in the ensemble Kalman filter (EnKF is sampling error. External sources of error, such as model error or deviations from Gaussianity, depend on the dynamical properties of the model. Sampling errors can lead to instability of the filter which, as a consequence, often requires inflation and localization. The goal of this article is to derive an ensemble Kalman filter which is less sensitive to sampling errors. A prior probability density function conditional on the forecast ensemble is derived using Bayesian principles. Even though this prior is built upon the assumption that the ensemble is Gaussian-distributed, it is different from the Gaussian probability density function defined by the empirical mean and the empirical error covariance matrix of the ensemble, which is implicitly used in traditional EnKFs. This new prior generates a new class of ensemble Kalman filters, called finite-size ensemble Kalman filter (EnKF-N. One deterministic variant, the finite-size ensemble transform Kalman filter (ETKF-N, is derived. It is tested on the Lorenz '63 and Lorenz '95 models. In this context, ETKF-N is shown to be stable without inflation for ensemble size greater than the model unstable subspace dimension, at the same numerical cost as the ensemble transform Kalman filter (ETKF. One variant of ETKF-N seems to systematically outperform the ETKF with optimally tuned inflation. However it is shown that ETKF-N does not account for all sampling errors, and necessitates localization like any EnKF, whenever the ensemble size is too small. In order to explore the need for inflation in this small ensemble size regime, a local version of the new class of filters is defined (LETKF-N and tested on the Lorenz '95 toy model. Whatever the size of the ensemble, the filter is stable. Its performance without inflation is slightly inferior to that of LETKF with optimally tuned inflation for small interval between updates, and

  18. Une autre ville pour une autre vie. Henri Lefebvre et les situationnistes

    Directory of Open Access Journals (Sweden)

    Philippe Simay

    2008-12-01

    Full Text Available L’un des traits distinctifs du mouvement situationniste est de s’être constamment préoccupé de la question urbaine. Conçue comme l’espace de production de la société du spectacle mais aussi comme un terrain de lutte et d’expérimentation, la ville a représenté pour ce mouvement estudiantin, proche d’Henri Lefebvre, le lieu d’une réinvention radicale de la vie quotidienne. Cet article revient sur la critique situationniste de l’urbanisme de l’après-guerre ainsi que sur les pratiques auxquelles elle a donné lieu (détournement, dérive, cartes psychogéographiques, construction de situations éphémères. Celles-ci peuvent être regardées comme la première expression d’un « droit à la ville », tel que l’entendait Lefebvre. Reste à savoir si le groupe de Guy Debord souhaitait véritablement « changer la ville pour changer la vie » ou si la ville n’était que le théâtre d’une révolution à venir.One of the distinctive traits of the situationist movement is its constant preoccupation with the urban issue. For this student movement close to Henri Lefebvre, the city has been thought of as a choice generic location for the production of the Society of the Spectacle, but also as a test ground for struggle and experimentation – the place where a radical reinvention of daily life can occur. This paper goes back to the situationist critique of post-war urbanism, as well as the behaviors and practices it has given birth to (misappropriation, drifts in meaning, psychogeographic maps, the construct of short-lived situations. These can be seen as the first expression of a « right to the city », in the sense Lefebvre originally meant it have. However, it is still unknown whether Guy Debord's group really wished to « change city-life to change life itself », or if to them the city was merely a theater for the enactment of a revolution to come.

  19. Une nouvelle caractérisation des fondations rocheuses pour une meilleure approche de la résistance au cisaillement d'une interface béton-roche

    OpenAIRE

    MOUZANNAR, Hussein; BOST, Marion; JOFFRIN, Patrick

    2015-01-01

    La construction d'un barrage-poids sur une fondation rocheuse nécessite une justification de la stabilité vis-à-vis du glissement à l'interface entre béton et roche. Or les nombreuses recherches sur le comportement au cisaillement d'une discontinuité rocheuse ont mis en évidence que le comportement dépend en partie de la morphologie de la surface rocheuse. L'étude du comportement au cisaillement d'une interface béton-roche doit donc comprendre la caractérisation de la rugosité de la surface r...

  20. In Brief: Science teaching certificate

    Science.gov (United States)

    Showstack, Randy

    2008-11-01

    More than 200 educators will receive fellowships over the next 5 years to participate in NASA's Endeavor Science Teaching Certificate Project, the agency announced on 14 November. Through workshops, online and on-site graduate courses, and NASA educational materials, the project will expose educators to NASA science and engineering and support them in translating the information for use in classrooms. ``Through the program, educators will learn to deliver cutting-edge science into the classroom, promoting science, technology, engineering, and mathematics education,'' according to Joyce Winterton, assistant administrator for education at NASA Headquarters, in Washington, D. C. Project fellows will earn a certificate from Teachers College Innovations at Teachers College, Columbia University, New York, and graduate credit from other institutional partners. For more information, visit http://education.nasa.gov/home/index.html.

  1. Envenimation mortelle par morsure de serpent chez une femme enceinte

    Directory of Open Access Journals (Sweden)

    Abdelkarim Shimi

    2011-02-01

    Full Text Available En Afrique, la prise en charge des envenimations vipérines demeure un problème majeur de santé publique avec un taux de mortalité qui reste élevé.La survenue d’une envenimation vipérine au cours de la grossesse est un événement rare, et grave du fait des conséquences maternelles et fatales qui en découlent. Les auteurs rapportent un cas de morsure de serpent au niveau de la face chez une femme enceinte, dont l’évolution a été marquée par l’installation d’un œdème cervico-facial nécessitant une trachéotomie en urgence, et une mort fatale in utero avec troubles de l’hémostase responsable du décès maternel dans un tableau de choc hémorragique.

  2. Contestation des Nobel une tradition aussi ancienne que leur attribution

    CERN Document Server

    Sevestre, G

    2003-01-01

    "La contestation des Nobel, avec cette annee la campagne lancee par un Americain afin de faire reconnaitre son role dans la mise au point de l'imagerie a resonance magnetique (IRM), constitue une tradition, quasiment aussi ancienne que l'attribution de ces distinctions" (1 page).

  3. Une instituut võitis Riias grand prix'

    Index Scriptorium Estoniae

    2007-01-01

    Animafilm "Une instituut" (stsenarist, režissöör ja kunstnik Mati Kütt; Nukufilm OÜ, 2006) võitis 5. rahvusvahelisel animafilmifestivalil Bimini peaauhinna. Osalesid ka Riho Undi "Miriam merehädas" ja Ülo Pikkovi "Elu maitse"

  4. Néphrocalcinose compliquant une miliaire tuberculeuse chez un nourrisson

    Science.gov (United States)

    El Maghraoui, Jaouad; Souilmi, Fatima Zahrae; Hbibi, Mohamed; Houssaini, Tarik Sqalli; Hida, Mustapha

    2015-01-01

    La néphrocalcinose se définit par la présence anormale dans le parenchyme rénal de dépôts calciques pouvant résulter de différentes affections. Nous rapportons le cas d'un nourrisson de 7 mois chez qui nous avons diagnostiqué une hypercalcémie compliquée par une néphrocalcinose secondaire à une tuberculose miliaire aggravée par l'intoxication à la vitamine D améliorée sous hyperhydratation, furosémide et glucocorticoïdes. A travers ce travail, nous insistons sur l'intérêt de la recherche d'une hypercalcémie devant toute infection tuberculeuse, de la prise en charge rapide et adaptée sans oublié d'interrompre la supplémentation en vitamine D. PMID:26309458

  5. Sciences à l'antenne : une interview de Sylvain Delzon

    OpenAIRE

    2015-01-01

    Une interview de Sylvain Delzon, qui nous parle du métier de chercheur à l'INRA et de sa vision de la publication scientifique.[br/] Publiez autrement, avec JPH Journal of Plant Hydraulics, open-access free of charge.

  6. Virtual Mobility in Higher Education. The UNED Campus Net Program

    Science.gov (United States)

    Aguado, Teresa; Monge, Fernando; Del Olmo, Alicia

    2014-01-01

    We present the UNED Virtual Mobility Campus Net Program, implemented since 2012 in collaboration with European and Latin American universities. Program's objectives, participating institutions, procedures, and evaluation are exposed. Virtual mobility is understood as a meaningful strategy for intercultural learning by studying an undergraduate or…

  7. Comparaison de deux mode de préparation des médicaments dans une maison de repos et de soins en Communauté germanophone : impact quantitatif et qualitatif sur la pharmacothérapie

    OpenAIRE

    Schroeder, Béatrice

    2010-01-01

    Introduction : La préparation des semainiers pour les patients des maisons de repos et de soins (MRS) par le pharmacien d’officine permet de diminuer les erreurs liées à l’administration des médicaments. Outre ce bénéfice, l’accès pour le pharmacien à l’ensemble du traitement devrait faciliter la validation pharmaceutique des prescriptions et le développement des soins pharmaceutiques de qualité pour les patients résidants en communauté. Contexte de l’étude : La MRS étudiée est une instit...

  8. 77 FR 73334 - Adding International Energy Efficiency (IEE) Certificate to List of Certificates a Recognized...

    Science.gov (United States)

    2012-12-10

    ... Pollution Prevention Certificate and the International Anti-Fouling System Certificate. See, respectively... Delegation of Authority, Anti-Fouling Systems. 0 2. Amend Sec. 8.320 as follows: 0 a. In paragraph...

  9. Certification-Based Process Analysis

    Science.gov (United States)

    Knight, Russell L.

    2013-01-01

    Space mission architects are often challenged with knowing which investment in technology infusion will have the highest return. Certification-based analysis (CBA) gives architects and technologists a means to communicate the risks and advantages of infusing technologies at various points in a process. Various alternatives can be compared, and requirements based on supporting streamlining or automation can be derived and levied on candidate technologies. CBA is a technique for analyzing a process and identifying potential areas of improvement. The process and analysis products are used to communicate between technologists and architects. Process means any of the standard representations of a production flow; in this case, any individual steps leading to products, which feed into other steps, until the final product is produced at the end. This sort of process is common for space mission operations, where a set of goals is reduced eventually to a fully vetted command sequence to be sent to the spacecraft. Fully vetting a product is synonymous with certification. For some types of products, this is referred to as verification and validation, and for others it is referred to as checking. Fundamentally, certification is the step in the process where one insures that a product works as intended, and contains no flaws.

  10. Progressive freezing of interacting spins in isolated finite magnetic ensembles

    Science.gov (United States)

    Bhattacharya, Kakoli; Dupuis, Veronique; Le-Roy, Damien; Deb, Pritam

    2017-02-01

    Self-organization of magnetic nanoparticles into secondary nanostructures provides an innovative way for designing functional nanomaterials with novel properties, different from the constituent primary nanoparticles as well as their bulk counterparts. Collective magnetic properties of such complex closed packing of magnetic nanoparticles makes them more appealing than the individual magnetic nanoparticles in many technological applications. This work reports the collective magnetic behaviour of magnetic ensembles comprising of single domain Fe3O4 nanoparticles. The present work reveals that the ensemble formation is based on the re-orientation and attachment of the nanoparticles in an iso-oriented fashion at the mesoscale regime. Comprehensive dc magnetic measurements show the prevalence of strong interparticle interactions in the ensembles. Due to the close range organization of primary Fe3O4 nanoparticles in the ensemble, the spins of the individual nanoparticles interact through dipolar interactions as realized from remnant magnetization measurements. Signature of super spin glass like behaviour in the ensembles is observed in the memory studies carried out in field cooled conditions. Progressive freezing of spins in the ensembles is corroborated from the Vogel-Fulcher fit of the susceptibility data. Dynamic scaling of relaxation reasserted slow spin dynamics substantiating cluster spin glass like behaviour in the ensembles.

  11. Soil texture reclassification by an ensemble model

    Science.gov (United States)

    Cisty, Milan; Hlavcova, Kamila

    2015-04-01

    a prerequisite for solving some subsequent task, this bias is propagated to the subsequent modelling or other work. Therefore, for the sake of achieving more general and precise outputs while solving such tasks, the authors of the present paper are proposing a hybrid approach, which has the potential for obtaining improved results. Although the authors continue recommending the use of the mentioned parametric PSD models in the proposed methodology, the final prediction is made by an ensemble machine learning algorithm based on regression trees, the so-called Random Forest algorithm, which is built on top of the outputs of such models, which serves as an ensemble members. An improvement in precision was proved, and it is documented in the paper that the ensemble model worked better than any of its constituents. References Nemes, A., Wosten, J.H.M., Lilly, A., Voshaar, J.H.O.: Evaluation of different procedures to interpolate particle-size distributions to achieve compatibility within soil databases. Geoderma 90, 187- 202 (1999) Hwang, S.: Effect of texture on the performance of soil particle-size distribution models. Geoderma 123, 363-371 (2004) Botula, Y.D., Cornelis, W.M., Baert, G., Mafuka, P., Van Ranst, E.: Particle size distribution models for soils of the humid tropics. J Soils Sediments. 13, 686-698 (2013)

  12. Peer Effects and Voluntary Green Building Certification

    Directory of Open Access Journals (Sweden)

    Yueming Qiu

    2016-07-01

    Full Text Available Empirical evidence is provided to show that peer effects have statistically significant and positive impacts on the diffusion of green building certificates. Application and approval records of green certificates by commercial buildings in NY and AZ are used. The challenge of self-selection is addressed by the usage of fixed effects and the challenge of reflection is addressed by the time lag delay between a building’s application and its approval. Empirical results show that an additional approved LEED certificate within a zip code will increase the probability of a commercial building in the same zip code to apply for a LEED certificate by 3–4 percentage points; an additional approved Energy Star certificate within a zip code will increase the probability of a commercial building in the same zip code to apply for an Energy Star certificate by 1–2 percentage points.

  13. PKI Interoperability Based on Online Certificate Validation

    Directory of Open Access Journals (Sweden)

    Dinu Smadu

    2011-03-01

    Full Text Available One of the most important problems related to Public Key Infrastructures is the validation of the digital certificates. Certificate validation services can be based on offline and/or online schemes. Offline schemes have the major disadvantage that they cannot always give an up-to-date response. On the other side, the most used protocol for online validation, the Online Certificate Status Protocol [1], also has its drawbacks. It can only state if a certificate has been revoked or not. RFC 5055 [2] defines a more complex protocol, the Server-based Certificate Validation Protocol (SCVP, capable of building and validating the certification path. To implement a basic functionality of this new protocol, we will start from an existing project, the CADDISK and we will try to implement an OpenSSL module.

  14. Deterministic entanglement of Rydberg ensembles by engineered dissipation

    DEFF Research Database (Denmark)

    Dasari, Durga; Mølmer, Klaus

    2014-01-01

    We propose a scheme that employs dissipation to deterministically generate entanglement in an ensemble of strongly interacting Rydberg atoms. With a combination of microwave driving between different Rydberg levels and a resonant laser coupling to a short lived atomic state, the ensemble can...... be driven towards a dark steady state that entangles all atoms. The long-range resonant dipole-dipole interaction between different Rydberg states extends the entanglement beyond the van der Walls interaction range with perspectives for entangling large and distant ensembles....

  15. Ensemble Deep Learning for Biomedical Time Series Classification

    Directory of Open Access Journals (Sweden)

    Lin-peng Jin

    2016-01-01

    Full Text Available Ensemble learning has been proved to improve the generalization ability effectively in both theory and practice. In this paper, we briefly outline the current status of research on it first. Then, a new deep neural network-based ensemble method that integrates filtering views, local views, distorted views, explicit training, implicit training, subview prediction, and Simple Average is proposed for biomedical time series classification. Finally, we validate its effectiveness on the Chinese Cardiovascular Disease Database containing a large number of electrocardiogram recordings. The experimental results show that the proposed method has certain advantages compared to some well-known ensemble methods, such as Bagging and AdaBoost.

  16. Ensemble Deep Learning for Biomedical Time Series Classification.

    Science.gov (United States)

    Jin, Lin-Peng; Dong, Jun

    2016-01-01

    Ensemble learning has been proved to improve the generalization ability effectively in both theory and practice. In this paper, we briefly outline the current status of research on it first. Then, a new deep neural network-based ensemble method that integrates filtering views, local views, distorted views, explicit training, implicit training, subview prediction, and Simple Average is proposed for biomedical time series classification. Finally, we validate its effectiveness on the Chinese Cardiovascular Disease Database containing a large number of electrocardiogram recordings. The experimental results show that the proposed method has certain advantages compared to some well-known ensemble methods, such as Bagging and AdaBoost.

  17. An Improved Particle Swarm Optimization Algorithm Based on Ensemble Technique

    Institute of Scientific and Technical Information of China (English)

    SHI Yan; HUANG Cong-ming

    2006-01-01

    An improved particle swarm optimization (PSO) algorithm based on ensemble technique is presented. The algorithm combines some previous best positions (pbest) of the particles to get an ensemble position (Epbest), which is used to replace the global best position (gbest). It is compared with the standard PSO algorithm invented by Kennedy and Eberhart and some improved PSO algorithms based on three different benchmark functions. The simulation results show that the improved PSO based on ensemble technique can get better solutions than the standard PSO and some other improved algorithms under all test cases.

  18. Ensemble Deep Learning for Biomedical Time Series Classification

    Science.gov (United States)

    2016-01-01

    Ensemble learning has been proved to improve the generalization ability effectively in both theory and practice. In this paper, we briefly outline the current status of research on it first. Then, a new deep neural network-based ensemble method that integrates filtering views, local views, distorted views, explicit training, implicit training, subview prediction, and Simple Average is proposed for biomedical time series classification. Finally, we validate its effectiveness on the Chinese Cardiovascular Disease Database containing a large number of electrocardiogram recordings. The experimental results show that the proposed method has certain advantages compared to some well-known ensemble methods, such as Bagging and AdaBoost.

  19. 8 CFR 1103.4 - Certifications.

    Science.gov (United States)

    2010-01-01

    ... agricultural worker and legalization cases—(1) General. The Commissioner or the Commissioner's delegate may.... (b) Certification of denials of special agricultural worker and legalization applications....

  20. Investigating weaknesses in Android certificate security

    Science.gov (United States)

    Krych, Daniel E.; Lange-Maney, Stephen; McDaniel, Patrick; Glodek, William

    2015-05-01

    Android's application market relies on secure certificate generation to establish trust between applications and their users; yet, cryptography is often not a priority for application developers and many fail to take the necessary security precautions. Indeed, there is cause for concern: several recent high-profile studies have observed a pervasive lack of entropy on Web-systems leading to the factorization of private keys.1 Sufficient entropy, or randomness, is essential to generate secure key pairs and combat predictable key generation. In this paper, we analyze the security of Android certificates. We investigate the entropy present in 550,000 Android application certificates using the Quasilinear GCD finding algorithm.1 Our results show that while the lack of entropy does not appear to be as ubiquitous in the mobile markets as on Web-systems, there is substantial reuse of certificates only one third of the certificates in our dataset were unique. In other words, we find that organizations frequently reuse certificates for different applications. While such a practice is acceptable under Google's specifications for a single developer, we find that in some cases the same certificates are used for a myriad of developers, potentially compromising Android's intended trust relationships. Further, we observed duplicate certificates being used by both malicious and non-malicious applications. The top 3 repeated certificates present in our dataset accounted for a total of 11,438 separate APKs. Of these applications, 451, or roughly 4%, were identified as malicious by antivirus services.

  1. Aménorrhée chimio induite chez une population marocaine: à propos d'une cohorte retrospective

    Science.gov (United States)

    Brahmi, Sami Aziz; Ziani, Fatima Zahra; Youssef, Seddik; Afqir, Said

    2016-01-01

    Introduction Le cancer du sein est un des cancers les plus fréquents chez la femme en pré ménopause et son traitement peut compromettre la fertilité. En effet, la chimiothérapie utilisée dans le cancer du sein peut conduire à une aménorrhée transitoire ou permanente chez les femmes non ménopausées. Méthodes Nous avons mené une étude rétrospective au service d'oncologie médicale du CHU Mohammed VI d'Oujda sur une période de 3 ans allant de janvier 2009 à décembre 2011 incluant les patientes jeunes ayant un cancer du sein localisé, pour étudier l'incidence de l'aménorrhée chimio-induite (ACI), ainsi que les facteurs prédictifs intervenant dans sa survenue. Résultats Dans notre série 74% de nos patientes ont présenté une ACI et 33.6% de nos patientes ont présenté une aménorrhée chimio-induite définitive. Plusieurs facteurs ont été étudiés à la recherche d’élément prédictifs de la survenue de l'aménorrhée. Concernant le facteur âge, l'analyse a montré que les femmes avec un âge supérieur à 40 ans étaient plus susceptibles de présenter une aménorrhée que celles avec un âge inférieur à 40 avec un pourcentage de 95,7% versus 56,1% avec une différence significative (p = 0.003). Conclusion L'incidence dans notre étude de l'ACI semble comparable à celle retrouvé dans la littérature, l’âge dans notre étude est le facteur prédictif le plus prédominant dans sa survenue. PMID:27642399

  2. China Initiates Voluntary Certification of Public Security Products

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    @@ Reporters learned from the Certification and Accreditation Administration of China(CNCA)that burglar-proof door became the first batch of voluntary certification product in public security products.China has formally initiated voluntary certification of public security products.

  3. 75 FR 28335 - Testing and Labeling Pertaining to Product Certification

    Science.gov (United States)

    2010-05-20

    ... Safety Commission 16 CFR Part 1107 Testing and Labeling Pertaining to Product Certification; Proposed... Product Certification AGENCY: Consumer Product Safety Commission. ACTION: Proposed rule. SUMMARY: The... product complies with certification requirements under a reasonable testing program for...

  4. 77 FR 56870 - Notice of Continuation of Certification

    Science.gov (United States)

    2012-09-14

    ... Employment and Training Administration Notice of Continuation of Certification Roseburg Forest Products... August 12, 2011, the Department of Labor (Department) issued a certification regarding workers... Federal Register on September 2, 2011 (76 FR 54796). The certification was based on the...

  5. The Establishment of National TC of Certification and Accreditation

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    @@ National standardization technical committee of certification and accreditation was established on Jan 15th, 2003in the 1st Certification and Accreditation Committee Member Conference held by Certification and Accreditation Administration of p R.C..

  6. 46 CFR 107.405 - Safety Equipment Certificate.

    Science.gov (United States)

    2010-10-01

    ... INSPECTION AND CERTIFICATION Certificates Under International Convention for Safety of Life at Sea, 1974... for Safety of Life at Sea, 1974. (b) A Safety Equipment Certificate expires 60 months after the...

  7. 14 CFR 65.89 - Display of certificate.

    Science.gov (United States)

    2010-01-01

    ... CERTIFICATION: AIRMEN OTHER THAN FLIGHT CREWMEMBERS Mechanics § 65.89 Display of certificate. Each person who holds a mechanic certificate shall keep it within the immediate area where he normally exercises...

  8. 7 CFR 205.400 - General requirements for certification.

    Science.gov (United States)

    2010-01-01

    ... MARKETING SERVICE (Standards, Inspections, Marketing Practices), DEPARTMENT OF AGRICULTURE (CONTINUED) ORGANIC FOODS PRODUCTION ACT PROVISIONS NATIONAL ORGANIC PROGRAM Certification § 205.400 General requirements for certification. A person seeking to receive or maintain organic certification under...

  9. 14 CFR 121.693 - Load manifest: All certificate holders.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Load manifest: All certificate holders. 121... manifest: All certificate holders. The load manifest must contain the following information concerning the... certificate holder....

  10. General approaches in ensemble quantum computing

    Indian Academy of Sciences (India)

    V Vimalan; N Chandrakumar

    2008-01-01

    We have developed methodology for NMR quantum computing focusing on enhancing the efficiency of initialization, of logic gate implementation and of readout. Our general strategy involves the application of rotating frame pulse sequences to prepare pseudopure states and to perform logic operations. We demonstrate experimentally our methodology for both homonuclear and heteronuclear spin ensembles. On model two-spin systems, the initialization time of one of our sequences is three-fourths (in the heteronuclear case) or one-fourth (in the homonuclear case), of the typical pulsed free precession sequences, attaining the same initialization efficiency. We have implemented the logical SWAP operation in homonuclear AMX spin systems using selective isotropic mixing, reducing the duration taken to a third compared to the standard re-focused INEPT-type sequence. We introduce the 1D version for readout of the rotating frame SWAP operation, in an attempt to reduce readout time. We further demonstrate the Hadamard mode of 1D SWAP, which offers 2N-fold reduction in experiment time for a system with -working bits, attaining the same sensitivity as the standard 1D version.

  11. Ensemble Kalman filtering with residual nudging

    CERN Document Server

    Luo, Xiaodong; 10.3402/tellusa.v64i0.17130

    2012-01-01

    Covariance inflation and localization are two important techniques that are used to improve the performance of the ensemble Kalman filter (EnKF) by (in effect) adjusting the sample covariances of the estimates in the state space. In this work an additional auxiliary technique, called residual nudging, is proposed to monitor and, if necessary, adjust the residual norms of state estimates in the observation space. In an EnKF with residual nudging, if the residual norm of an analysis is larger than a pre-specified value, then the analysis is replaced by a new one whose residual norm is no larger than a pre-specified value. Otherwise the analysis is considered as a reasonable estimate and no change is made. A rule for choosing the pre-specified value is suggested. Based on this rule, the corresponding new state estimates are explicitly derived in case of linear observations. Numerical experiments in the 40-dimensional Lorenz 96 model show that introducing residual nudging to an EnKF may improve its accuracy and/o...

  12. Orchestrating Distributed Resource Ensembles for Petascale Science

    Energy Technology Data Exchange (ETDEWEB)

    Baldin, Ilya; Mandal, Anirban; Ruth, Paul; Yufeng, Xin

    2014-04-24

    Distributed, data-intensive computational science applications of interest to DOE scientific com- munities move large amounts of data for experiment data management, distributed analysis steps, remote visualization, and accessing scientific instruments. These applications need to orchestrate ensembles of resources from multiple resource pools and interconnect them with high-capacity multi- layered networks across multiple domains. It is highly desirable that mechanisms are designed that provide this type of resource provisioning capability to a broad class of applications. It is also important to have coherent monitoring capabilities for such complex distributed environments. In this project, we addressed these problems by designing an abstract API, enabled by novel semantic resource descriptions, for provisioning complex and heterogeneous resources from multiple providers using their native provisioning mechanisms and control planes: computational, storage, and multi-layered high-speed network domains. We used an extensible resource representation based on semantic web technologies to afford maximum flexibility to applications in specifying their needs. We evaluated the effectiveness of provisioning using representative data-intensive ap- plications. We also developed mechanisms for providing feedback about resource performance to the application, to enable closed-loop feedback control and dynamic adjustments to resource allo- cations (elasticity). This was enabled through development of a novel persistent query framework that consumes disparate sources of monitoring data, including perfSONAR, and provides scalable distribution of asynchronous notifications.

  13. Variety of synchronous regimes in neuronal ensembles

    Science.gov (United States)

    Komarov, M. A.; Osipov, G. V.; Suykens, J. A. K.

    2008-09-01

    We consider a Hodgkin-Huxley-type model of oscillatory activity in neurons of the snail Helix pomatia. This model has a distinctive feature: It demonstrates multistability in oscillatory and silent modes that is typical for the thalamocortical neurons. A single neuron cell can demonstrate a variety of oscillatory activity: Regular and chaotic spiking and bursting behavior. We study collective phenomena in small and large arrays of nonidentical cells coupled by models of electrical and chemical synapses. Two single elements coupled by electrical coupling show different types of synchronous behavior, in particular in-phase and antiphase synchronous regimes. In an ensemble of three inhibitory synaptically coupled elements, the phenomenon of sequential synchronous dynamics is observed. We study the synchronization phenomena in the chain of nonidentical neurons at different oscillatory behavior coupled with electrical and chemical synapses. Various regimes of phase synchronization are observed: (i) Synchronous regular and chaotic spiking; (ii) synchronous regular and chaotic bursting; and (iii) synchronous regular and chaotic bursting with different numbers of spikes inside the bursts. We detect and study the effect of collective synchronous burst generation due to the cluster formation and the oscillatory death.

  14. Large margin classifier-based ensemble tracking

    Science.gov (United States)

    Wang, Yuru; Liu, Qiaoyuan; Yin, Minghao; Wang, ShengSheng

    2016-07-01

    In recent years, many studies consider visual tracking as a two-class classification problem. The key problem is to construct a classifier with sufficient accuracy in distinguishing the target from its background and sufficient generalize ability in handling new frames. However, the variable tracking conditions challenges the existing methods. The difficulty mainly comes from the confused boundary between the foreground and background. This paper handles this difficulty by generalizing the classifier's learning step. By introducing the distribution data of samples, the classifier learns more essential characteristics in discriminating the two classes. Specifically, the samples are represented in a multiscale visual model. For features with different scales, several large margin distribution machine (LDMs) with adaptive kernels are combined in a Baysian way as a strong classifier. Where, in order to improve the accuracy and generalization ability, not only the margin distance but also the sample distribution is optimized in the learning step. Comprehensive experiments are performed on several challenging video sequences, through parameter analysis and field comparison, the proposed LDM combined ensemble tracker is demonstrated to perform with sufficient accuracy and generalize ability in handling various typical tracking difficulties.

  15. Model error estimation in ensemble data assimilation

    Directory of Open Access Journals (Sweden)

    S. Gillijns

    2007-01-01

    Full Text Available A new methodology is proposed to estimate and account for systematic model error in linear filtering as well as in nonlinear ensemble based filtering. Our results extend the work of Dee and Todling (2000 on constant bias errors to time-varying model errors. In contrast to existing methodologies, the new filter can also deal with the case where no dynamical model for the systematic error is available. In the latter case, the applicability is limited by a matrix rank condition which has to be satisfied in order for the filter to exist. The performance of the filter developed in this paper is limited by the availability and the accuracy of observations and by the variance of the stochastic model error component. The effect of these aspects on the estimation accuracy is investigated in several numerical experiments using the Lorenz (1996 model. Experimental results indicate that the availability of a dynamical model for the systematic error significantly reduces the variance of the model error estimates, but has only minor effect on the estimates of the system state. The filter is able to estimate additive model error of any type, provided that the rank condition is satisfied and that the stochastic errors and measurement errors are significantly smaller than the systematic errors. The results of this study are encouraging. However, it remains to be seen how the filter performs in more realistic applications.

  16. Emergent order in ensembles of active spinners

    Science.gov (United States)

    van Zuiden, Benjamin C.; Paulose, Jayson; Irvine, William T. M.; Bartolo, Denis; Vitelli, Vincenzo

    Interacting self-propelled particles is proxy to model many living systems from cytoskeletal motors to bird flocks, while also providing a framework to investigate fundamental questions in non equilibrium statistical mechanics. A surge of recent studies have shown that self-propulsion significantly modifies the phase behavior of particles interacting via potential interactions. A prototypical example is the so-called Motility Induced Phase Separation occurring in ensembles of self-propelled hard spheres. In stark contrast, our understanding of active spinning, as opposed to self-propulsion, remains very scarce. Here, we study a system of self-spinning dimers, interacting via soft repulsive forces. Upon varying the density and activity, we observe a range of emergent phases characterized by different degrees of spatiotemporal order in the position and orientation of the dimers. Changes in bulk properties, including crystallization, melting, and freezing, are reflected in the collective motion of the particles. We rationalize our numerical findings theoretically and demonstrate some of these concepts in a active granular experiment.

  17. Group Theory for Embedded Random Matrix Ensembles

    CERN Document Server

    Kota, V K B

    2014-01-01

    Embedded random matrix ensembles are generic models for describing statistical properties of finite isolated quantum many-particle systems. For the simplest spinless fermion (or boson) systems with say $m$ fermions (or bosons) in $N$ single particle states and interacting with say $k$-body interactions, we have EGUE($k$) [embedded GUE of $k$-body interactions) with GUE embedding and the embedding algebra is $U(N)$. In this paper, using EGUE($k$) representation for a Hamiltonian that is $k$-body and an independent EGUE($t$) representation for a transition operator that is $t$-body and employing the embedding $U(N)$ algebra, finite-$N$ formulas for moments up to order four are derived, for the first time, for the transition strength densities (transition strengths multiplied by the density of states at the initial and final energies). In the asymptotic limit, these formulas reduce to those derived for the EGOE version and establish that in general bivariate transition strength densities take bivariate Gaussian ...

  18. Quantum metrology with cold atomic ensembles

    Directory of Open Access Journals (Sweden)

    Mitchell Morgan W.

    2013-08-01

    Full Text Available Quantum metrology uses quantum features such as entanglement and squeezing to improve the sensitivity of quantum-limited measurements. Long established as a valuable technique in optical measurements such as gravitational-wave detection, quantum metrology is increasingly being applied to atomic instruments such as matter-wave interferometers, atomic clocks, and atomic magnetometers. Several of these new applications involve dual optical/atomic quantum systems, presenting both new challenges and new opportunities. Here we describe an optical magnetometry system that achieves both shot-noise-limited and projection-noise-limited performance, allowing study of optical magnetometry in a fully-quantum regime [1]. By near-resonant Faraday rotation probing, we demonstrate measurement-based spin squeezing in a magnetically-sensitive atomic ensemble [2-4]. The versatility of this system allows us also to design metrologically-relevant optical nonlinearities, and to perform quantum-noise-limited measurements with interacting photons. As a first interaction-based measurement [5], we implement a non-linear metrology scheme proposed by Boixo et al. with the surprising feature of precision scaling better than the 1/N “Heisenberg limit” [6].

  19. A past discharge assimilation system for ensemble streamflow forecasts over France – Part 2: Impact on the ensemble streamflow forecasts

    Directory of Open Access Journals (Sweden)

    G. Thirel

    2010-08-01

    Full Text Available The use of ensemble streamflow forecasts is developing in the international flood forecasting services. Ensemble streamflow forecast systems can provide more accurate forecasts and useful information about the uncertainty of the forecasts, thus improving the assessment of risks. Nevertheless, these systems, like all hydrological forecasts, suffer from errors on initialization or on meteorological data, which lead to hydrological prediction errors. This article, which is the second part of a 2-part article, concerns the impacts of initial states, improved by a streamflow assimilation system, on an ensemble streamflow prediction system over France. An assimilation system was implemented to improve the streamflow analysis of the SAFRAN-ISBA-MODCOU (SIM hydro-meteorological suite, which initializes the ensemble streamflow forecasts at Météo-France. This assimilation system, using the Best Linear Unbiased Estimator (BLUE and modifying the initial soil moisture states, showed an improvement of the streamflow analysis with low soil moisture increments. The final states of this suite were used to initialize the ensemble streamflow forecasts of Météo-France, which are based on the SIM model and use the European Centre for Medium-range Weather Forecasts (ECMWF 10-day Ensemble Prediction System (EPS. Two different configurations of the assimilation system were used in this study: the first with the classical SIM model and the second using improved soil physics in ISBA. The effects of the assimilation system on the ensemble streamflow forecasts were assessed for these two configurations, and a comparison was made with the original (i.e. without data assimilation and without the improved physics ensemble streamflow forecasts. It is shown that the assimilation system improved most of the statistical scores usually computed for the validation of ensemble predictions (RMSE, Brier Skill Score and its decomposition, Ranked Probability Skill Score, False Alarm

  20. Variations de maintien de l'équilibre dynamique entre une population d'adolescents atteints de scoliose idiopathique et une population d'adolescents non scioliotiques

    OpenAIRE

    2015-01-01

    Introduction La scoliose idiopathique de l’adolescent (SIA) progresse durant la période de croissance. L’une des déficiences fréquemment observée chez les adolescents atteints de SIA est une perturbation du contrôle postural, qui influence le maintien de l’équilibre. Il n’existe, cependant, aucun consensus concernant ce sujet. L’objectif de ce travail consiste à déterminer quelles sont les variations de maintien de l’équilibre dynamique entre une population atteinte de SIA et une population d...

  1. CNCA and MOFCOM Released Green Market Certification Rules

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    @@ Learned from the Certification and Accreditation Administration of the People's Republic of China (CNCA) on 9th June, the Green Market Certification Rules formulated by the Certification and Accreditation Administration of the People's Republic of China and the Ministry of Commerce (MOFCOM) will be formally implemented from the date of June 30. The Rules has defined specific requirements for the certification institutions and certification personnel engaged in the certification of Green Market.

  2. Ensembles on configuration space classical, quantum, and beyond

    CERN Document Server

    Hall, Michael J W

    2016-01-01

    This book describes a promising approach to problems in the foundations of quantum mechanics, including the measurement problem. The dynamics of ensembles on configuration space is shown here to be a valuable tool for unifying the formalisms of classical and quantum mechanics, for deriving and extending the latter in various ways, and for addressing the quantum measurement problem. A description of physical systems by means of ensembles on configuration space can be introduced at a very fundamental level: the basic building blocks are a configuration space, probabilities, and Hamiltonian equations of motion for the probabilities. The formalism can describe both classical and quantum systems, and their thermodynamics, with the main difference being the choice of ensemble Hamiltonian. Furthermore, there is a natural way of introducing ensemble Hamiltonians that describe the evolution of hybrid systems; i.e., interacting systems that have distinct classical and quantum sectors, allowing for consistent descriptio...

  3. Phase-selective entrainment of nonlinear oscillator ensembles

    Science.gov (United States)

    Zlotnik, Anatoly; Nagao, Raphael; Kiss, István Z.; Li-Shin, Jr.

    2016-03-01

    The ability to organize and finely manipulate the hierarchy and timing of dynamic processes is important for understanding and influencing brain functions, sleep and metabolic cycles, and many other natural phenomena. However, establishing spatiotemporal structures in biological oscillator ensembles is a challenging task that requires controlling large collections of complex nonlinear dynamical units. In this report, we present a method to design entrainment signals that create stable phase patterns in ensembles of heterogeneous nonlinear oscillators without using state feedback information. We demonstrate the approach using experiments with electrochemical reactions on multielectrode arrays, in which we selectively assign ensemble subgroups into spatiotemporal patterns with multiple phase clusters. The experimentally confirmed mechanism elucidates the connection between the phases and natural frequencies of a collection of dynamical elements, the spatial and temporal information that is encoded within this ensemble, and how external signals can be used to retrieve this information.

  4. Time and ensemble averaging in time series analysis

    CERN Document Server

    Latka, Miroslaw; Jernajczyk, Wojciech; West, Bruce J

    2010-01-01

    In many applications expectation values are calculated by partitioning a single experimental time series into an ensemble of data segments of equal length. Such single trajectory ensemble (STE) is a counterpart to a multiple trajectory ensemble (MTE) used whenever independent measurements or realizations of a stochastic process are available. The equivalence of STE and MTE for stationary systems was postulated by Wang and Uhlenbeck in their classic paper on Brownian motion (Rev. Mod. Phys. 17, 323 (1945)) but surprisingly has not yet been proved. Using the stationary and ergodic paradigm of statistical physics -- the Ornstein-Uhlenbeck (OU) Langevin equation, we revisit Wang and Uhlenbeck's postulate. In particular, we find that the variance of the solution of this equation is different for these two ensembles. While the variance calculated using the MTE quantifies the spreading of independent trajectories originating from the same initial point, the variance for STE measures the spreading of two correlated r...

  5. Ensemble vs. time averages in financial time series analysis

    Science.gov (United States)

    Seemann, Lars; Hua, Jia-Chen; McCauley, Joseph L.; Gunaratne, Gemunu H.

    2012-12-01

    Empirical analysis of financial time series suggests that the underlying stochastic dynamics are not only non-stationary, but also exhibit non-stationary increments. However, financial time series are commonly analyzed using the sliding interval technique that assumes stationary increments. We propose an alternative approach that is based on an ensemble over trading days. To determine the effects of time averaging techniques on analysis outcomes, we create an intraday activity model that exhibits periodic variable diffusion dynamics and we assess the model data using both ensemble and time averaging techniques. We find that ensemble averaging techniques detect the underlying dynamics correctly, whereas sliding intervals approaches fail. As many traded assets exhibit characteristic intraday volatility patterns, our work implies that ensemble averages approaches will yield new insight into the study of financial markets’ dynamics.

  6. An educational model for ensemble streamflow simulation and uncertainty analysis

    Directory of Open Access Journals (Sweden)

    A. AghaKouchak

    2012-06-01

    Full Text Available This paper presents a hands-on modeling toolbox, HBV-Ensemble, designed as a complement to theoretical hydrology lectures, to teach hydrological processes and their uncertainties. The HBV-Ensemble can be used for in-class lab practices and homework assignments, and assessment of students' understanding of hydrological processes. Using this model, students can gain more insights into how hydrological processes (e.g., precipitation, snowmelt and snow accumulation, soil moisture, evapotranspiration and runoff generation are interconnected. The model includes a MATLAB Graphical User Interface (GUI and an ensemble simulation scheme that can be used for not only hydrological processes, but also for teaching uncertainty analysis, parameter estimation, ensemble simulation and model sensitivity.

  7. Relation between native ensembles and experimental structures of proteins

    DEFF Research Database (Denmark)

    Best, R. B.; Lindorff-Larsen, Kresten; DePristo, M. A.

    2006-01-01

    Data Bank ensembles; moreover, we show that the effects of uncertainties in structure determination are insufficient to explain the results. These results highlight the importance of accounting for native-state protein dynamics in making comparisons with ensemble-averaged experimental data and suggest......Different experimental structures of the same protein or of proteins with high sequence similarity contain many small variations. Here we construct ensembles of "high-sequence similarity Protein Data Bank" (HSP) structures and consider the extent to which such ensembles represent the structural...... heterogeneity of the native state in solution. We find that different NMR measurements probing structure and dynamics of given proteins in solution, including order parameters, scalar couplings, and residual dipolar couplings, are remarkably well reproduced by their respective high-sequence similarity Protein...

  8. Spectroscopic properties of inhomogeneously broadened spin ensembles in a cavity

    DEFF Research Database (Denmark)

    Kurucz, Zoltan; Wesenberg, Janus; Mølmer, Klaus

    2011-01-01

    The enhanced collective coupling to weak quantum fields may turn atomic or spin ensembles into an important component in quantum information processing architectures. Inhomogeneous broadening can, however, significantly reduce the coupling and the lifetime of the collective excitation...

  9. Harmonisation of wind turbine certification in Europe JOULE project EWTC

    Energy Technology Data Exchange (ETDEWEB)

    Nath, C. [Germanischer Lloyd, Hamburg (Germany); Eriksson, C. [Det Norske Veritas, Hellerup (Denmark); Hulle, F. van [Frans van Hulle, Petten (Netherlands); Skamris, C. [Risoe National Lab., Roskilde (Denmark); Stam, W. [CIWI Holland, Arnheim (Netherlands); Vionis, P. [CRES, Attki (Greece)

    1999-03-01

    Wind turbine certification requirements are currently fairly divers within Europe. Therefore the leading European certification bodies initiated a JOULE project to harmonise the certification procedure on the basis of the current set of IEC/EN 61400 series standards. The paper presents a review of the state of the art of wind turbine certification in European countries and an outline of the sturcture of the project. The main steps of the project are (a) the collection of differences in certification practices by round robin certification of three wind turbine types; (b) assessment of the different certification results and (c) the development of a harmonised certification procedure. (au) EU-JOULE-3. 19 refs.

  10. Ensemble control of linear systems with parameter uncertainties

    Science.gov (United States)

    Kou, Kit Ian; Liu, Yang; Zhang, Dandan; Tu, Yanshuai

    2016-07-01

    In this paper, we study the optimal control problem for a class of four-dimensional linear systems based on quaternionic and Fourier analysis. When the control is unconstrained, the optimal ensemble controller for this linear ensemble control systems is given in terms of prolate spheroidal wave functions. For the constrained convex optimisation problem of such systems, the quadratic programming is presented to obtain the optimal control laws. Simulations are given to verity the effectiveness of the proposed theory.

  11. Clustering Categorical Data:A Cluster Ensemble Approach

    Institute of Scientific and Technical Information of China (English)

    He Zengyou(何增友); Xu Xiaofei; Deng Shengchun

    2003-01-01

    Clustering categorical data, an integral part of data mining,has attracted much attention recently. In this paper, the authors formally define the categorical data clustering problem as an optimization problem from the viewpoint of cluster ensemble, and apply cluster ensemble approach for clustering categorical data. Experimental results on real datasets show that better clustering accuracy can be obtained by comparing with existing categorical data clustering algorithms.

  12. An automated approach to network features of protein structure ensembles.

    Science.gov (United States)

    Bhattacharyya, Moitrayee; Bhat, Chanda R; Vishveshwara, Saraswathi

    2013-10-01

    Network theory applied to protein structures provides insights into numerous problems of biological relevance. The explosion in structural data available from PDB and simulations establishes a need to introduce a standalone-efficient program that assembles network concepts/parameters under one hood in an automated manner. Herein, we discuss the development/application of an exhaustive, user-friendly, standalone program package named PSN-Ensemble, which can handle structural ensembles generated through molecular dynamics (MD) simulation/NMR studies or from multiple X-ray structures. The novelty in network construction lies in the explicit consideration of side-chain interactions among amino acids. The program evaluates network parameters dealing with topological organization and long-range allosteric communication. The introduction of a flexible weighing scheme in terms of residue pairwise cross-correlation/interaction energy in PSN-Ensemble brings in dynamical/chemical knowledge into the network representation. Also, the results are mapped on a graphical display of the structure, allowing an easy access of network analysis to a general biological community. The potential of PSN-Ensemble toward examining structural ensemble is exemplified using MD trajectories of an ubiquitin-conjugating enzyme (UbcH5b). Furthermore, insights derived from network parameters evaluated using PSN-Ensemble for single-static structures of active/inactive states of β2-adrenergic receptor and the ternary tRNA complexes of tyrosyl tRNA synthetases (from organisms across kingdoms) are discussed. PSN-Ensemble is freely available from http://vishgraph.mbu.iisc.ernet.in/PSN-Ensemble/psn_index.html.

  13. Ensembles of probability estimation trees for customer churn prediction

    OpenAIRE

    2010-01-01

    Customer churn prediction is one of the most, important elements tents of a company's Customer Relationship Management, (CRM) strategy In tins study, two strategies are investigated to increase the lift. performance of ensemble classification models, i.e (1) using probability estimation trees (PETs) instead of standard decision trees as base classifiers; and (n) implementing alternative fusion rules based on lift weights lot the combination of ensemble member's outputs Experiments ale conduct...

  14. La chimie du XVIIe siècle : une question de principes

    Directory of Open Access Journals (Sweden)

    Rémi Franckowiak

    2008-04-01

    Full Text Available Le tournant du XVIIe au XVIIIe siècle est une période décisive pour l’histoire de la chimie qui passe de la reconnaissance institutionnelle à la contestation de son fondement théorique, pour apparaître au final comme la seule partie de la Physique à pouvoir prétendre atteindre la « vérité certaine ». Ce qui se joue alors n’est rien de moins que la redéfinition de ses principes, à savoir son socle de vérités sur lequel s’appuie la science chimique. Cette période est en fait la dernière étape de l’évolution du rapport entre les deux dimensions – théorique et pratique – dans lesquelles se déploie la chimie, qui a vu, par le développement de l’usage des principes dits seconds, l’ensemble des principes chimiques entrainé vers un réalisme empirique, ayant pour effet d’ôter de la chimie toute cohérence théorique. Aussi l’apparition du mécanisme – pas plus celui de Boyle – n’est-il en réalité responsable du bouleversement que connaît la chimie ; elle n’est pas davantage responsable de sa régénération au tout début du XVIIIe siècle. La conscience de la faiblesse théorique de la chimie va devenir pour elle promesse de vigueur théorique sur la base de ce qui représente sa force : l’expérience. À la suite de la perte de ce qui fut certitude, le chimiste devient un être à ré-instruire. Un chimiste tel que Samuel Cottereau Du Clos illustre parfaitement le passage d’une science chimique comme connaissance des principes à une chimie comme science cette fois du vraisemblable.The last decades of 17th century represent a decisive period for the history of Chemistry which switched from institutional recognition to dispute of its theoretical basis, to seem finally, during the very first years of the next century, the only part of Physics being able to claim reaching the “unquestionable truth”. What did happen then is nothing less than the redefinition of principles of Chemistry

  15. Reconversion écologique et socialisation des retraites : pour une politique industrielle du XXIe siècle

    Directory of Open Access Journals (Sweden)

    Gilles L. Bourque

    2011-11-01

    Full Text Available Cet article présente une analyse des scénarios possibles au Québec pour assurer la reconversion écologique du secteur des transports collectifs. La réflexion sur l'avenir des politiques industrielles doit en effet intégrer l'impact des changements climatiques et de la réduction de la disponibilité des énergies fossiles. Au Québec, le modèle de développement a toujours intégré la question de l'indépendance énergétique, et plus récemment des énergies renouvelables, à la réflexion sur le modèle de développement. L'apport de la recherche consiste à évaluer, dans une perspective globale pour l'ensemble du secteur et pour le Québec dans son ensemble, les enjeux de l'électrification du transport collectif, autant à l'intérieur des agglomérations que pour le transport entre les pôles régionaux. L'analyse des enjeux de l'électrification du transport collectif porte également sur les modes de financement possibles à l'intérieur du système de retraite au Québec, que ce soit dans le cadre actuel des politiques de placement des régimes de retraite ou encore à travers la création d'outils financiers particuliers comme cela a été fait dans d'autres pays.This article presents a coherent scenario to provide ecological transition of public transport in order to escape from the dependency on non-renewable energy sources. This transition is an important matter for industrial economics and public policy because sectoral level analysis is usually the most effective one. In Québec, the model of development has taken into account for a long time the issue of energetic independence through renewable energy and its impact on industries. This article offers a global evaluation of the costs and financing process for the transition towards electric public transport in large cities and between them. It also shows that it is possible to secure the funds through pension funds investment policy and the creation of green bonds that are

  16. Three-model ensemble wind prediction in southern Italy

    Science.gov (United States)

    Torcasio, Rosa Claudia; Federico, Stefano; Calidonna, Claudia Roberta; Avolio, Elenio; Drofa, Oxana; Landi, Tony Christian; Malguzzi, Piero; Buzzi, Andrea; Bonasoni, Paolo

    2016-03-01

    Quality of wind prediction is of great importance since a good wind forecast allows the prediction of available wind power, improving the penetration of renewable energies into the energy market. Here, a 1-year (1 December 2012 to 30 November 2013) three-model ensemble (TME) experiment for wind prediction is considered. The models employed, run operationally at National Research Council - Institute of Atmospheric Sciences and Climate (CNR-ISAC), are RAMS (Regional Atmospheric Modelling System), BOLAM (BOlogna Limited Area Model), and MOLOCH (MOdello LOCale in H coordinates). The area considered for the study is southern Italy and the measurements used for the forecast verification are those of the GTS (Global Telecommunication System). Comparison with observations is made every 3 h up to 48 h of forecast lead time. Results show that the three-model ensemble outperforms the forecast of each individual model. The RMSE improvement compared to the best model is between 22 and 30 %, depending on the season. It is also shown that the three-model ensemble outperforms the IFS (Integrated Forecasting System) of the ECMWF (European Centre for Medium-Range Weather Forecast) for the surface wind forecasts. Notably, the three-model ensemble forecast performs better than each unbiased model, showing the added value of the ensemble technique. Finally, the sensitivity of the three-model ensemble RMSE to the length of the training period is analysed.

  17. Concrete ensemble Kalman filters with rigorous catastrophic filter divergence.

    Science.gov (United States)

    Kelly, David; Majda, Andrew J; Tong, Xin T

    2015-08-25

    The ensemble Kalman filter and ensemble square root filters are data assimilation methods used to combine high-dimensional, nonlinear dynamical models with observed data. Ensemble methods are indispensable tools in science and engineering and have enjoyed great success in geophysical sciences, because they allow for computationally cheap low-ensemble-state approximation for extremely high-dimensional turbulent forecast models. From a theoretical perspective, the dynamical properties of these methods are poorly understood. One of the central mysteries is the numerical phenomenon known as catastrophic filter divergence, whereby ensemble-state estimates explode to machine infinity, despite the true state remaining in a bounded region. In this article we provide a breakthrough insight into the phenomenon, by introducing a simple and natural forecast model that transparently exhibits catastrophic filter divergence under all ensemble methods and a large set of initializations. For this model, catastrophic filter divergence is not an artifact of numerical instability, but rather a true dynamical property of the filter. The divergence is not only validated numerically but also proven rigorously. The model cleanly illustrates mechanisms that give rise to catastrophic divergence and confirms intuitive accounts of the phenomena given in past literature.

  18. Ensembles of a small number of conformations with relative populations

    Energy Technology Data Exchange (ETDEWEB)

    Vammi, Vijay, E-mail: vsvammi@iastate.edu; Song, Guang, E-mail: gsong@iastate.edu [Iowa State University, Bioinformatics and Computational Biology Program, Department of Computer Science (United States)

    2015-12-15

    In our previous work, we proposed a new way to represent protein native states, using ensembles of a small number of conformations with relative Populations, or ESP in short. Using Ubiquitin as an example, we showed that using a small number of conformations could greatly reduce the potential of overfitting and assigning relative populations to protein ensembles could significantly improve their quality. To demonstrate that ESP indeed is an excellent alternative to represent protein native states, in this work we compare the quality of two ESP ensembles of Ubiquitin with several well-known regular ensembles or average structure representations. Extensive amount of significant experimental data are employed to achieve a thorough assessment. Our results demonstrate that ESP ensembles, though much smaller in size comparing to regular ensembles, perform equally or even better sometimes in all four different types of experimental data used in the assessment, namely, the residual dipolar couplings, residual chemical shift anisotropy, hydrogen exchange rates, and solution scattering profiles. This work further underlines the significance of having relative populations in describing the native states.

  19. Long-range interacting systems in the unconstrained ensemble.

    Science.gov (United States)

    Latella, Ivan; Pérez-Madrid, Agustín; Campa, Alessandro; Casetti, Lapo; Ruffo, Stefano

    2017-01-01

    Completely open systems can exchange heat, work, and matter with the environment. While energy, volume, and number of particles fluctuate under completely open conditions, the equilibrium states of the system, if they exist, can be specified using the temperature, pressure, and chemical potential as control parameters. The unconstrained ensemble is the statistical ensemble describing completely open systems and the replica energy is the appropriate free energy for these control parameters from which the thermodynamics must be derived. It turns out that macroscopic systems with short-range interactions cannot attain equilibrium configurations in the unconstrained ensemble, since temperature, pressure, and chemical potential cannot be taken as a set of independent variables in this case. In contrast, we show that systems with long-range interactions can reach states of thermodynamic equilibrium in the unconstrained ensemble. To illustrate this fact, we consider a modification of the Thirring model and compare the unconstrained ensemble with the canonical and grand-canonical ones: The more the ensemble is constrained by fixing the volume or number of particles, the larger the space of parameters defining the equilibrium configurations.

  20. Knowledge based cluster ensemble for cancer discovery from biomolecular data.

    Science.gov (United States)

    Yu, Zhiwen; Wongb, Hau-San; You, Jane; Yang, Qinmin; Liao, Hongying

    2011-06-01

    The adoption of microarray techniques in biological and medical research provides a new way for cancer diagnosis and treatment. In order to perform successful diagnosis and treatment of cancer, discovering and classifying cancer types correctly is essential. Class discovery is one of the most important tasks in cancer classification using biomolecular data. Most of the existing works adopt single clustering algorithms to perform class discovery from biomolecular data. However, single clustering algorithms have limitations, which include a lack of robustness, stability, and accuracy. In this paper, we propose a new cluster ensemble approach called knowledge based cluster ensemble (KCE) which incorporates the prior knowledge of the data sets into the cluster ensemble framework. Specifically, KCE represents the prior knowledge of a data set in the form of pairwise constraints. Then, the spectral clustering algorithm (SC) is adopted to generate a set of clustering solutions. Next, KCE transforms pairwise constraints into confidence factors for these clustering solutions. After that, a consensus matrix is constructed by considering all the clustering solutions and their corresponding confidence factors. The final clustering result is obtained by partitioning the consensus matrix. Comparison with single clustering algorithms and conventional cluster ensemble approaches, knowledge based cluster ensemble approaches are more robust, stable and accurate. The experiments on cancer data sets show that: 1) KCE works well on these data sets; 2) KCE not only outperforms most of the state-of-the-art single clustering algorithms, but also outperforms most of the state-of-the-art cluster ensemble approaches.

  1. Long-range interacting systems in the unconstrained ensemble

    Science.gov (United States)

    Latella, Ivan; Pérez-Madrid, Agustín; Campa, Alessandro; Casetti, Lapo; Ruffo, Stefano

    2017-01-01

    Completely open systems can exchange heat, work, and matter with the environment. While energy, volume, and number of particles fluctuate under completely open conditions, the equilibrium states of the system, if they exist, can be specified using the temperature, pressure, and chemical potential as control parameters. The unconstrained ensemble is the statistical ensemble describing completely open systems and the replica energy is the appropriate free energy for these control parameters from which the thermodynamics must be derived. It turns out that macroscopic systems with short-range interactions cannot attain equilibrium configurations in the unconstrained ensemble, since temperature, pressure, and chemical potential cannot be taken as a set of independent variables in this case. In contrast, we show that systems with long-range interactions can reach states of thermodynamic equilibrium in the unconstrained ensemble. To illustrate this fact, we consider a modification of the Thirring model and compare the unconstrained ensemble with the canonical and grand-canonical ones: The more the ensemble is constrained by fixing the volume or number of particles, the larger the space of parameters defining the equilibrium configurations.

  2. Flood Forecasting Based on TIGGE Precipitation Ensemble Forecast

    Directory of Open Access Journals (Sweden)

    Jinyin Ye

    2016-01-01

    Full Text Available TIGGE (THORPEX International Grand Global Ensemble was a major part of the THORPEX (Observing System Research and Predictability Experiment. It integrates ensemble precipitation products from all the major forecast centers in the world and provides systematic evaluation on the multimodel ensemble prediction system. Development of meteorologic-hydrologic coupled flood forecasting model and early warning model based on the TIGGE precipitation ensemble forecast can provide flood probability forecast, extend the lead time of the flood forecast, and gain more time for decision-makers to make the right decision. In this study, precipitation ensemble forecast products from ECMWF, NCEP, and CMA are used to drive distributed hydrologic model TOPX. We focus on Yi River catchment and aim to build a flood forecast and early warning system. The results show that the meteorologic-hydrologic coupled model can satisfactorily predict the flow-process of four flood events. The predicted occurrence time of peak discharges is close to the observations. However, the magnitude of the peak discharges is significantly different due to various performances of the ensemble prediction systems. The coupled forecasting model can accurately predict occurrence of the peak time and the corresponding risk probability of peak discharge based on the probability distribution of peak time and flood warning, which can provide users a strong theoretical foundation and valuable information as a promising new approach.

  3. SVM and SVM Ensembles in Breast Cancer Prediction

    Science.gov (United States)

    Huang, Min-Wei; Chen, Chih-Wen; Lin, Wei-Chao; Ke, Shih-Wen; Tsai, Chih-Fong

    2017-01-01

    Breast cancer is an all too common disease in women, making how to effectively predict it an active research problem. A number of statistical and machine learning techniques have been employed to develop various breast cancer prediction models. Among them, support vector machines (SVM) have been shown to outperform many related techniques. To construct the SVM classifier, it is first necessary to decide the kernel function, and different kernel functions can result in different prediction performance. However, there have been very few studies focused on examining the prediction performances of SVM based on different kernel functions. Moreover, it is unknown whether SVM classifier ensembles which have been proposed to improve the performance of single classifiers can outperform single SVM classifiers in terms of breast cancer prediction. Therefore, the aim of this paper is to fully assess the prediction performance of SVM and SVM ensembles over small and large scale breast cancer datasets. The classification accuracy, ROC, F-measure, and computational times of training SVM and SVM ensembles are compared. The experimental results show that linear kernel based SVM ensembles based on the bagging method and RBF kernel based SVM ensembles with the boosting method can be the better choices for a small scale dataset, where feature selection should be performed in the data pre-processing stage. For a large scale dataset, RBF kernel based SVM ensembles based on boosting perform better than the other classifiers. PMID:28060807

  4. Hybrid Intrusion Detection Using Ensemble of Classification Methods

    Directory of Open Access Journals (Sweden)

    M.Govindarajan

    2014-01-01

    Full Text Available One of the major developments in machine learning in the past decade is the ensemble method, which finds highly accurate classifier by combining many moderately accurate component classifiers. In this research work, new ensemble classification methods are proposed for homogeneous ensemble classifiers using bagging and heterogeneous ensemble classifiers using arcing classifier and their performances are analyzed in terms of accuracy. A Classifier ensemble is designed using Radial Basis Function (RBF and Support Vector Machine (SVM as base classifiers. The feasibility and the benefits of the proposed approaches are demonstrated by the means of real and benchmark data sets of intrusion detection. The main originality of the proposed approach is based on three main parts: preprocessing phase, classification phase and combining phase. A wide range of comparative experiments are conducted for real and benchmark data sets of intrusion detection. The accuracy of base classifiers is compared with homogeneous and heterogeneous models for data mining problem. The proposed ensemble methods provide significant improvement of accuracy compared to individual classifiers and also heterogeneous models exhibit better results than homogeneous models for real and benchmark data sets of intrusion detection.

  5. Selecting, weeding, and weighting biased climate model ensembles

    Science.gov (United States)

    Jackson, C. S.; Picton, J.; Huerta, G.; Nosedal Sanchez, A.

    2012-12-01

    In the Bayesian formulation, the "log-likelihood" is a test statistic for selecting, weeding, or weighting climate model ensembles with observational data. This statistic has the potential to synthesize the physical and data constraints on quantities of interest. One of the thorny issues for formulating the log-likelihood is how one should account for biases. While in the past we have included a generic discrepancy term, not all biases affect predictions of quantities of interest. We make use of a 165-member ensemble CAM3.1/slab ocean climate models with different parameter settings to think through the issues that are involved with predicting each model's sensitivity to greenhouse gas forcing given what can be observed from the base state. In particular we use multivariate empirical orthogonal functions to decompose the differences that exist among this ensemble to discover what fields and regions matter to the model's sensitivity. We find that the differences that matter are a small fraction of the total discrepancy. Moreover, weighting members of the ensemble using this knowledge does a relatively poor job of adjusting the ensemble mean toward the known answer. This points out the shortcomings of using weights to correct for biases in climate model ensembles created by a selection process that does not emphasize the priorities of your log-likelihood.

  6. SVM and SVM Ensembles in Breast Cancer Prediction.

    Science.gov (United States)

    Huang, Min-Wei; Chen, Chih-Wen; Lin, Wei-Chao; Ke, Shih-Wen; Tsai, Chih-Fong

    2017-01-01

    Breast cancer is an all too common disease in women, making how to effectively predict it an active research problem. A number of statistical and machine learning techniques have been employed to develop various breast cancer prediction models. Among them, support vector machines (SVM) have been shown to outperform many related techniques. To construct the SVM classifier, it is first necessary to decide the kernel function, and different kernel functions can result in different prediction performance. However, there have been very few studies focused on examining the prediction performances of SVM based on different kernel functions. Moreover, it is unknown whether SVM classifier ensembles which have been proposed to improve the performance of single classifiers can outperform single SVM classifiers in terms of breast cancer prediction. Therefore, the aim of this paper is to fully assess the prediction performance of SVM and SVM ensembles over small and large scale breast cancer datasets. The classification accuracy, ROC, F-measure, and computational times of training SVM and SVM ensembles are compared. The experimental results show that linear kernel based SVM ensembles based on the bagging method and RBF kernel based SVM ensembles with the boosting method can be the better choices for a small scale dataset, where feature selection should be performed in the data pre-processing stage. For a large scale dataset, RBF kernel based SVM ensembles based on boosting perform better than the other classifiers.

  7. Concrete ensemble Kalman filters with rigorous catastrophic filter divergence

    Science.gov (United States)

    Kelly, David; Majda, Andrew J.; Tong, Xin T.

    2015-01-01

    The ensemble Kalman filter and ensemble square root filters are data assimilation methods used to combine high-dimensional, nonlinear dynamical models with observed data. Ensemble methods are indispensable tools in science and engineering and have enjoyed great success in geophysical sciences, because they allow for computationally cheap low-ensemble-state approximation for extremely high-dimensional turbulent forecast models. From a theoretical perspective, the dynamical properties of these methods are poorly understood. One of the central mysteries is the numerical phenomenon known as catastrophic filter divergence, whereby ensemble-state estimates explode to machine infinity, despite the true state remaining in a bounded region. In this article we provide a breakthrough insight into the phenomenon, by introducing a simple and natural forecast model that transparently exhibits catastrophic filter divergence under all ensemble methods and a large set of initializations. For this model, catastrophic filter divergence is not an artifact of numerical instability, but rather a true dynamical property of the filter. The divergence is not only validated numerically but also proven rigorously. The model cleanly illustrates mechanisms that give rise to catastrophic divergence and confirms intuitive accounts of the phenomena given in past literature. PMID:26261335

  8. EnsembleGASVR: A novel ensemble method for classifying missense single nucleotide polymorphisms

    KAUST Repository

    Rapakoulia, Trisevgeni

    2014-04-26

    Motivation: Single nucleotide polymorphisms (SNPs) are considered the most frequently occurring DNA sequence variations. Several computational methods have been proposed for the classification of missense SNPs to neutral and disease associated. However, existing computational approaches fail to select relevant features by choosing them arbitrarily without sufficient documentation. Moreover, they are limited to the problem ofmissing values, imbalance between the learning datasets and most of them do not support their predictions with confidence scores. Results: To overcome these limitations, a novel ensemble computational methodology is proposed. EnsembleGASVR facilitates a twostep algorithm, which in its first step applies a novel evolutionary embedded algorithm to locate close to optimal Support Vector Regression models. In its second step, these models are combined to extract a universal predictor, which is less prone to overfitting issues, systematizes the rebalancing of the learning sets and uses an internal approach for solving the missing values problem without loss of information. Confidence scores support all the predictions and the model becomes tunable by modifying the classification thresholds. An extensive study was performed for collecting the most relevant features for the problem of classifying SNPs, and a superset of 88 features was constructed. Experimental results show that the proposed framework outperforms well-known algorithms in terms of classification performance in the examined datasets. Finally, the proposed algorithmic framework was able to uncover the significant role of certain features such as the solvent accessibility feature, and the top-scored predictions were further validated by linking them with disease phenotypes. © The Author 2014.

  9. Ensemble Kalman filter versus ensemble smoother for assessing hydraulic conductivity via tracer test data assimilation

    Directory of Open Access Journals (Sweden)

    E. Crestani

    2013-04-01

    Full Text Available Estimating the spatial variability of hydraulic conductivity K in natural aquifers is important for predicting the transport of dissolved compounds. Especially in the nonreactive case, the plume evolution is mainly controlled by the heterogeneity of K. At the local scale, the spatial distribution of K can be inferred by combining the Lagrangian formulation of the transport with a Kalman-filter-based technique and assimilating a sequence of time-lapse concentration C measurements, which, for example, can be evaluated on site through the application of a geophysical method. The objective of this work is to compare the ensemble Kalman filter (EnKF and the ensemble smoother (ES capabilities to retrieve the hydraulic conductivity spatial distribution in a groundwater flow and transport modeling framework. The application refers to a two-dimensional synthetic aquifer in which a tracer test is simulated. Moreover, since Kalman-filter-based methods are optimal only if each of the involved variables fit to a Gaussian probability density function (pdf and since this condition may not be met by some of the flow and transport state variables, issues related to the non-Gaussianity of the variables are analyzed and different transformation of the pdfs are considered in order to evaluate their influence on the performance of the methods. The results show that the EnKF reproduces with good accuracy the hydraulic conductivity field, outperforming the ES regardless of the pdf of the concentrations.

  10. On evaluation of ensemble precipitation forecasts with observation-based ensembles

    Directory of Open Access Journals (Sweden)

    S. Jaun

    2007-04-01

    Full Text Available Spatial interpolation of precipitation data is uncertain. How important is this uncertainty and how can it be considered in evaluation of high-resolution probabilistic precipitation forecasts? These questions are discussed by experimental evaluation of the COSMO consortium's limited-area ensemble prediction system COSMO-LEPS. The applied performance measure is the often used Brier skill score (BSS. The observational references in the evaluation are (a analyzed rain gauge data by ordinary Kriging and (b ensembles of interpolated rain gauge data by stochastic simulation. This permits the consideration of either a deterministic reference (the event is observed or not with 100% certainty or a probabilistic reference that makes allowance for uncertainties in spatial averaging. The evaluation experiments show that the evaluation uncertainties are substantial even for the large area (41 300 km2 of Switzerland with a mean rain gauge distance as good as 7 km: the one- to three-day precipitation forecasts have skill decreasing with forecast lead time but the one- and two-day forecast performances differ not significantly.

  11. Didactique du lexique et problématique de l'unité lexicale : état d'une confusion

    OpenAIRE

    Petit, Gérard

    2000-01-01

    La didactique du lexique1 privilégie en général l'acquisition, c'est-à-dire l'accroissement du stock d'unités maîtrisées et employées par l'apprenant. Cette approche quantitative de la construction de la compétence repose sur un ensemble de prérequis dont l'utilité n'est plus à démontrer2 mais dont la pérennisation dans la suite des cursus s'avère particulièrement néfaste dès que l'apprenant est confronté à une exigence de technicité, notamment pour la préparation des concours de recrutement ...

  12. La danse sabar, une expression de l’identité féminine chez les Wolof du Sénégal 

    OpenAIRE

    Penna-Diaw, Luciana

    2011-01-01

    Sabar est un terme générique qui désigne à la fois la circonstance organisée par les femmes, l’ensemble des tambours qui servent à l’animer et l’un des rythmes qui y sont joués. Plusieurs aspects anthropologiques et musicaux ont été pris en compte. Dans un premier temps, l’auteur a cherché à dégager, du point de vue anthropologique, les éléments essentiels de la société wolof et les changements sociaux qui ont eu une forte incidence sur la musique et la fonction de la femme dans les circonsta...

  13. Ce que "réorganisation" veut dire ? une étude du démantèlement de la centrale nucléaire Phenix

    OpenAIRE

    Pelleterat De Borde, Melchior; Martin, Christophe; Besnard, Denis; Guarnieri, Franck

    2013-01-01

    Il n'existe pas pour le moment de réelle industrie du démantèlement nucléaire, et les expériences de grande ampleur manquent. Elles ont jusqu'à présent permis de développer un savoir essentiellement technique. D'importants choix politiques en Europe et au Japon viennent rappeler que le démantèlement va constituer, dans les années à venir, un dé pour l'ensemble de la filière nucléaire. Depuis 2010, le CRC est engagé dans une étude à la centrale Phénix, à Marcoule, qui a cessé de fonctionner en...

  14. Analyse formelle et relationnelle de concepts pour la modélisation et l'interrogation d'une collection documentaire

    OpenAIRE

    Mimouni, Nada; Nazarenko, Adeline; Salotti, Sylvie

    2012-01-01

    National audience; Une collection documentaire est généralement représentée comme un ensemble de documents mais cette modélisation ne permet pas de rendre compte des relations intertextuelles et du contexte d'interprétation d'un document. Le modèle documentaire classique trouve ses limites dans les domaines spécialisés où les besoins d'accès à l'information correspondent à des usages spécifiques et où les documents sont liés par de nombreux types de relations. Cet article propose un modèle pe...

  15. 29 CFR 19.5 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 29 Labor 1 2010-07-01 2010-07-01 true Certification. 19.5 Section 19.5 Labor Office of the Secretary of Labor RIGHT TO FINANCIAL PRIVACY ACT § 19.5 Certification. Prior to obtaining the requested records pursuant to a formal written request, a senior official designated by the head of the...

  16. 48 CFR 25.702-2 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 1 2010-10-01 2010-10-01 false Certification. 25.702-2 Section 25.702-2 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION SOCIOECONOMIC PROGRAMS FOREIGN ACQUISITION Prohibited Sources 25.702-2 Certification. As required by the...

  17. 40 CFR 86.001-30 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Certification. 86.001-30 Section 86.001-30 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED...-Fueled and Methanol-Fueled Heavy-Duty Vehicles § 86.001-30 Certification. Section 86.001-30 includes...

  18. 30 CFR 75.1201 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Certification. 75.1201 Section 75.1201 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR COAL MINE SAFETY AND HEALTH MANDATORY SAFETY STANDARDS-UNDERGROUND COAL MINES Maps § 75.1201 Certification. Such map shall be made or...

  19. 29 CFR 501.47 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 29 Labor 3 2010-07-01 2010-07-01 false Certification. 501.47 Section 501.47 Labor Regulations Relating to Labor (Continued) WAGE AND HOUR DIVISION, DEPARTMENT OF LABOR REGULATIONS ENFORCEMENT OF... AND NATIONALITY ACT Administrative Proceedings Record § 501.47 Certification. Upon receipt of...

  20. 40 CFR 86.096-30 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Certification. 86.096-30 Section 86.096-30 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED...-Fueled and Methanol-Fueled Heavy-Duty Vehicles § 86.096-30 Certification. (a)(1)-(14) (a)(15) For...

  1. 40 CFR 86.098-30 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Certification. 86.098-30 Section 86.098-30 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED...-Fueled and Methanol-Fueled Heavy-Duty Vehicles § 86.098-30 Certification. (a)(1)-(18) (a)(19) For...

  2. 28 CFR 47.5 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 28 Judicial Administration 2 2010-07-01 2010-07-01 false Certification. 47.5 Section 47.5 Judicial Administration DEPARTMENT OF JUSTICE (CONTINUED) RIGHT TO FINANCIAL PRIVACY ACT § 47.5 Certification. Prior to obtaining the requested records pursuant to a formal written request, an official of a rank designated...

  3. 47 CFR 95.851 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false Certification. 95.851 Section 95.851 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES PERSONAL RADIO SERVICES 218-219 MHz Service Technical Standards § 95.851 Certification. Each CTS and RTU transmitter...

  4. 31 CFR 14.5 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 1 2010-07-01 2010-07-01 false Certification. 14.5 Section 14.5 Money and Finance: Treasury Office of the Secretary of the Treasury RIGHT TO FINANCIAL PRIVACY ACT § 14.5 Certification. Prior to obtaining the requested records pursuant to a formal written request,...

  5. Increasing certification through unit-based education.

    Science.gov (United States)

    Fischer-Cartlidge, Erica; Mahon, Suzanne

    2014-04-01

    Certification has been identified by multiple organizations as an important component and means of elevating the level of nursing care provided to patients and demonstrating to the public that the nursing staff has subspecialty knowledge. Certification may lead to improved patient satisfaction and outcomes as well as increased nurse satisfaction and retention. Despite the known potential benefits associated with certification, institutions struggle to improve certification rates. One possible method to overcome system barriers to certification is the implementation of a unit-based study course to prepare nurses for the Certified Breast Care Nurse (CBCN) examination. Data collected by an author-developed tool as one institution created and executed a unit-based study course suggest that such an approach increased certification rates and improved disease-specific knowledge and confidence among the staff, despite no official data existing on the tool's reliability and validity. Implementation of similar programs may be successful in improving certification at other institutions seeking to raise certification rates.

  6. 40 CFR 86.095-30 - Certification.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 18 2010-07-01 2010-07-01 false Certification. 86.095-30 Section 86.095-30 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED...-Fueled and Methanol-Fueled Heavy-Duty Vehicles § 86.095-30 Certification. (a)(1)-(3) (4)(i)-(iii)...

  7. 46 CFR 160.073-5 - Certification.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 6 2010-10-01 2010-10-01 false Certification. 160.073-5 Section 160.073-5 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) EQUIPMENT, CONSTRUCTION, AND MATERIALS... Certification. (a) The float-free link is not approved by the Coast Guard. The manufacturer of the link...

  8. Is Halal Certification Process “Green”?

    Directory of Open Access Journals (Sweden)

    Mohd Rizal Razalli

    2012-09-01

    Full Text Available These days, the environmental perspective on operations is becoming more common. In fact, any effort in improving efficiency in the organization is closely related to sustainability of our environment. The Environmental Management System (EMS certification such as ISO 14001 has been accepted as the world standard. In addition to these ISO standards, there are other certifications such as Halal certification. There is no research that investigates the relationship between Halal Certification process and its effect on our environment. Hence, our main research question is that is Halal Certification process can be considered as environmental friendly? In this paper, we argue that Halal Certification also contributes towards green initiatives. We used EDC-UUM as our case study. EDC-UUM is actively seeking the Halal certification from Malaysian authority agency or JAKIM. In this study, we assessed the perception of the EDC-UUM staff on the issue of going green. The findings and implications are discussed in the paper. Keywords: halal certification, hotel operations, sustainability, green

  9. Administrator Certification Requirements for Student Assessment Competence.

    Science.gov (United States)

    Trevisan, Michael S.

    1999-01-01

    State-level administrator certification requirements were studied with respect to student-assessment expectations, using responses of state certification offices. Only 18 states require some form of student-assessment knowledge and skills, and only Washington state requires the assessment competencies promulgated by the National Policy Board for…

  10. General certification procedure of formation organizations

    CERN Document Server

    Int. At. Energy Agency, Wien

    2002-01-01

    This document presents the procedure dealing with the certification of formation organizations dispensing the formation and the risks prevention to the personnel of A or B category in nuclear facilities. This certification proves the organization ability to satisfy the ''F'' specification of the CEFRI. (A.L.B.)

  11. 30 CFR 955.15 - Certification.

    Science.gov (United States)

    2010-07-01

    ... his or her control, OSM may issue a non-renewable temporary OSM blaster certificate for a maximum term... 30 Mineral Resources 3 2010-07-01 2010-07-01 false Certification. 955.15 Section 955.15 Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR PROGRAMS FOR...

  12. Unmanned Aircraft Pilot Medical Certification Requirements

    Science.gov (United States)

    2007-02-01

    Warren Silberman represented the FAA Aerospace Medical Certification Division in regard to the medical certification require- ments. Given that the...Johnson, Marca Access 5 marca@direcway.com 410-961-3149 McCarley, Jason U of Illinois Institute of Aviation mccarley@uiuc.edu 217-244-8854 Silberman

  13. 7 CFR 652.26 - Certification renewal.

    Science.gov (United States)

    2010-01-01

    ..., DEPARTMENT OF AGRICULTURE SUPPORT ACTIVITIES TECHNICAL SERVICE PROVIDER ASSISTANCE Certification § 652.26... additional time period in accordance with this section. (b) A technical service provider may request renewal... 7 Agriculture 6 2010-01-01 2010-01-01 false Certification renewal. 652.26 Section...

  14. 5 CFR 1330.403 - System certification.

    Science.gov (United States)

    2010-01-01

    ... PERSONNEL MANAGEMENT HUMAN RESOURCES MANAGEMENT Performance Appraisal Certification for Pay Purposes § 1330.403 System certification. (a) The performance appraisal system(s) covering senior employees must be... § 430.210, as applicable. In some agencies, the performance appraisal system(s) covers employees in...

  15. 5 CFR 430.403 - System certification.

    Science.gov (United States)

    2010-01-01

    ... MANAGEMENT Performance Appraisal Certification for Pay Purposes § 430.403 System certification. (a) The performance appraisal system(s) covering senior employees must be certified by OPM, with OMB concurrence, as... agencies, the performance appraisal system(s) covers employees in many organizations and/or components,...

  16. An "Exceptional" NBPTS Certificate for Special Educators.

    Science.gov (United States)

    Helms, Ronald G.

    2000-01-01

    This article describes the new National Board for Professional Teaching Standards (NBPTS) certificate for teachers of students with disabilities. The certification process, the required Exceptional Needs portfolio, the assessment center, and the application fee are discussed, along with answers to frequently asked questions about the NBPTS.…

  17. Brief Introduction to Compulsory Product Certification System

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    @@ What is Compulsory Product Certification System? Compulsory Product Certification System is a kind of product qualifying assessment system which implements under laws and regulations by states in order to protect life security of human, animals and plants as well as environmental protection and national security.

  18. PKIX Certificate Status in Hybrid MANETs

    Science.gov (United States)

    Muñoz, Jose L.; Esparza, Oscar; Gañán, Carlos; Parra-Arnau, Javier

    Certificate status validation is a hard problem in general but it is particularly complex in Mobile Ad-hoc Networks (MANETs) because we require solutions to manage both the lack of fixed infrastructure inside the MANET and the possible absence of connectivity to trusted authorities when the certification validation has to be performed. In this sense, certificate acquisition is usually assumed as an initialization phase. However, certificate validation is a critical operation since the node needs to check the validity of certificates in real-time, that is, when a particular certificate is going to be used. In such MANET environments, it may happen that the node is placed in a part of the network that is disconnected from the source of status data at the moment the status checking is required. Proposals in the literature suggest the use of caching mechanisms so that the node itself or a neighbour node has some status checking material (typically on-line status responses or lists of revoked certificates). However, to the best of our knowledge the only criterion to evaluate the cached (obsolete) material is the time. In this paper, we analyse how to deploy a certificate status checking PKI service for hybrid MANET and we propose a new criterion based on risk to evaluate cached status data that is much more appropriate and absolute than time because it takes into account the revocation process.

  19. 10 CFR 76.21 - Certificate required.

    Science.gov (United States)

    2010-01-01

    ..., use, or transfer radioactive material at the gaseous diffusion plants at Piketon, Ohio, and Paducah... REGULATORY COMMISSION (CONTINUED) CERTIFICATION OF GASEOUS DIFFUSION PLANTS General Provisions § 76.21 Certificate required. (a) The Corporation or its contractors may not operate the gaseous diffusion plants...

  20. 7 CFR 800.165 - Corrected certificates.

    Science.gov (United States)

    2010-01-01

    ... this process shall be corrected according to this section. (b) Who may correct. Only official personnel.... According to this section and the instructions, corrected certificates shall show (i) the terms “Corrected... that has been superseded by another certificate or on the basis of a subsequent analysis for...