102 results on '"Lefrançois, M"'
Search Results
2. Comparison of egg production, quality and composition in three production systems for laying hens
- Author
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Philippe, F.X., Mahmoudi, Y., Cinq-Mars, D., Lefrançois, M., Moula, N., Palacios, J., Pelletier, F., and Godbout, S.
- Published
- 2020
- Full Text
- View/download PDF
3. Observables in Topological Theories: A Superspace Formulation
- Author
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Boldo, J. L., Constantinidis, C. P., Gieres, F., Lefrançois, M., and Piguet, O.
- Subjects
High Energy Physics - Theory - Abstract
Observables of topological Yang-Mills theory were defined by Witten as the classes of an equivariant cohomology. We propose to define them alternatively as the BRST cohomology classes of a superspace version of the theory, where BRST invariance is associated to super Yang-Mills invariance. We provide and discuss the general solution of this cohomology., Comment: Prepared for International Conference on Renormalization Group and Anomalies in Gravity and Cosmology (IRGA 2003), Ouro Preto, MG, Brazil, 17-23 Mar 2003
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- 2004
- Full Text
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4. Symmetries and observables in topological gravity
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Constantinidis, C. P., Deandrea, A., Gieres, F., Lefrancois, M., and Piguet, O.
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General Relativity and Quantum Cosmology ,High Energy Physics - Theory - Abstract
After a brief review of topological gravity, we present a superspace approach to this theory. This formulation allows us to recover in a natural manner various known results and to gain some insight into the precise relationship between different approaches to topological gravity. Though the main focus of our work is on the vielbein formalism, we also discuss the metric approach and its relationship with the former formalism., Comment: 34 pages; a few explanations added in subsection 2.2.1, published version of paper
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- 2004
- Full Text
- View/download PDF
5. Viscoplastic behavior of a FeCrAl alloy for high temperature steam electrolysis (HTSE) sealing applications between 700 °C and 900 °C
- Author
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Bérard, P., Bartout, J.-D., Reytier, M., Lefrançois, M., and Besson, J.
- Published
- 2011
- Full Text
- View/download PDF
6. Multicentre study of neoadjuvant chemotherapy for stage I and II oesophageal cancer
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Bekkar, S., Gronnier, C., Renaud, F., Duhamel, A., Pasquer, A., Théreaux, J., Gagnière, J., Meunier, B., Collet, D., Mariette, C., Dhahri, A., Lignier, D., Cossé, C., Regimbeau, J.-M., Luc, G., Cabau, M., Jougon, J., Badic, B., Lozach, P., Bail, J. P., Cappeliez, S., El Nakadi, I., Lebreton, G., Alves, A., Flamein, R., Pezet, D., Pipitone, F., Stan-Iuga, B., Contival, N., Pappalardo, E., Coueffe, X., Msika, S., Mantziari, S., Demartines, N., Hec, F., Vanderbeken, M., Tessier, W., Briez, N., Fredon, F., Gainant, A., Mathonnet, M., Bigourdan, J. M., Mezoughi, S., Ducerf, C., Baulieux, J., Mabrut, J.-Y., Baraket, O., Poncet, G., Adam, M., Vaudoyer, D., Enfer, P. Jourdan, Villeneuve, L., Glehen, O., Coste, T., Fabre, J.-M., Marchal, F., Frisoni, R., Ayav, A., Brunaud, L., Bresler, L., Cohen, C., Aze, O., Venissac, N., Pop, D., Mouroux, J., Donici, I., Prudhomme, M., Felli, E., Lisunfui, S., Seman, M., Petit, G. Godiris, Karoui, M., Tresallet, C., Ménégaux, F., Vaillant, J.-C., Hannoun, L., Malgras, B., Lantuas, D., Pautrat, K., Pocard, M., Valleur, P., Lefevre, J. H., Chafai, N., Balladur, P., Lefrançois, M., Parc, Y., Paye, F., Tiret, E., Nedelcu, M., Laface, L., Perniceni, T., Gayet, B., Turner, K., Filipello, A., Porcheron, J., Tiffet, O., Kamlet, N., Chemaly, R., Klipfel, A., Pessaux, P., Brigand, C., Rohr, S., Carrère, N., Da Re, C., Dumont, F., Goéré, D., Elias, D., and Bertrand, C.
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- 2016
- Full Text
- View/download PDF
7. Immediate outcome, long-term function and quality of life after extended colectomy with ileorectal or ileosigmoid anastomosis
- Author
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Duclos, J., Lefevre, J. H., Lefrançois, M., Lupinacci, R., Shields, C., Chafai, N., Tiret, E., and Parc, Y.
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- 2014
- Full Text
- View/download PDF
8. EVIDENCE FROM SYNTHETIC AGONISTS OF THE CXCR4 CHEMOKINE RECEPTOR ALTERS THE DOGMA OF CHEMOTAXIS ACTIVATION: 391
- Author
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Escher, E., Lefrançois, M., Mona, C., Marsault, E., Lavigne, P., Leduc, R., and Heveker, N.
- Published
- 2014
9. Transient-enhanced diffusion in shallow-junction formation
- Author
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Fiory, A. T., Chawda, S. G., Madishetty, S., Mehta, V. R., Ravindra, N. M., Mccoy, S. P., Lefrançois, M. E., Bourdelle, K. K., Mckinley, J. M., Gossmann, H. -J. L., and Agarwal, A.
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- 2002
- Full Text
- View/download PDF
10. Increasing interoperability in the Web of Things using Autonomous Agents (Position Paper)
- Author
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Chung, E., Lefrançois, M., Olivier BOISSIER, Breuil, Florent, Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT), Institut Henri Fayol (FAYOL-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Département Informatique et systèmes intelligents ( FAYOL-ENSMSE), and Ecole Nationale Supérieure des Mines de St Etienne
- Subjects
[INFO.INFO-WB] Computer Science [cs]/Web ,Thing Description ,systèmes multi-agents ,[INFO.INFO-WB]Computer Science [cs]/Web ,Web des objets ,[INFO] Computer Science [cs] ,Interoperability ,[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation ,Autonomous Agents ,[INFO.INFO-CL]Computer Science [cs]/Computation and Language [cs.CL] ,Multi-Agent Systems ,agents autonomes ,[INFO.INFO-CL] Computer Science [cs]/Computation and Language [cs.CL] ,interopérabilité ,[INFO]Computer Science [cs] ,Web of Things ,[INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation - Abstract
The Web of Things (WoT) aims to enable interoperability across the Internet of Things (IoT) and application domains. However, the number and heterogeneity of connected devices continues to grow. The integration of multiple Things with different interaction methods requires human effort and intervention, and is increasingly challenging as their heterogeneity grows. Some form of automation of this task, for example by delegating new service compositions to autonomous agent, would require mechanisms for uniform access and interaction among Things. In this position paper, we investigate how Semantic Interoperability Solutions (SIS) can be combined with multi-agent systems (MAS), to allow agents to autonomously interact with these WoT resources. We use as a starting point the work of the Web of Things Working Group at W3C (World Wide Web Consortium). We identify and describe issues related to i) the representation, ii) the discovery and selection of Things, and iii) the interaction between agents and Things. We claim that these issues are the core tenets to ensure this integration using MAS, WoT and SIS., Le Web des objets (WoT) vise à permettre l'interopérabi-lité au sein de l'Internet des objets (IoT) et des domaines d'application. Toutefois, le nombre et l'hétérogénéité des dispositifs connectés ne cessent de croître. L'intégration de multiples objets avec des méthodes différentes d'interac-tion nécessite des efforts et des interventions humaines, et est de plus en plus difficile avec leur hétérogénéité crois-sante. Une certaine forme d'automatisation de cette tâche, par exemple en déléguant de nouvelles compositions de services à un agent autonome, nécessite des mécanismes d'accès et d'interaction uniformes entre les Objets. Dans cet article, nous étudions comment les solutions d'interopé-rabilité sémantique (SIS) peuvent être combinées avec des systèmes multi-agents (SMA), pour permettre aux agents d'interagir de manière autonome avec ces ressources du WoT. Nous utilisons comme point de départ les travaux du groupe de travail sur le Web des objets au W3C (World Wide Web Consortium). Nous identifions et décrivons les problèmes liés i) à la représentation, ii) à la découverte et à la sélection des objets, et iii) à l'interaction entre les agents et les objets. Les réponses à ces questions sont essentielles pour assurer cette intégration en utilisant les SMA, le WoT et SIS.
- Published
- 2020
11. Comparison of egg production, quality and composition in three production systems for laying hens
- Author
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Philippe, François-Xavier, Mahmoudi, Y., Cinq-Mars, D., Lefrançois, M., Moula, Nassim, Palacios, J., Pelletier, F., Godbout, S., Philippe, François-Xavier, Mahmoudi, Y., Cinq-Mars, D., Lefrançois, M., Moula, Nassim, Palacios, J., Pelletier, F., and Godbout, S.
- Abstract
info:eu-repo/semantics/published
- Published
- 2020
12. The Semantic Sensor Network Ontology, Revamped
- Author
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Taylor, K., Haller, A., Lefrançois, M., Simon Cox, Janowicz, K., García-Castro, R., Le-Phuoc, D., Lieberman, J., Atkinson, R., Stadler, C., Breuil, Florent, Australian National University (ANU), University of Surrey (UNIS), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT), Institut Henri Fayol (FAYOL-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Département Informatique et systèmes intelligents ( FAYOL-ENSMSE), Ecole Nationale Supérieure des Mines de St Etienne, Laboratoire Hubert Curien [Saint Etienne] (LHC), Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), CSIRO Division of Information Technology (CSIRO DIT), Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO), University of California, Ontology Engineering Group [Madrid] (OEG), Facultad de Informatica, Universidad Politécnica de Madrid (UPM)-Universidad Politécnica de Madrid (UPM), Technische Universität Berlin (TU), Harvard University [Cambridge], Metalinkage, Institut für Informatik [Leipzig], and Universität Leipzig [Leipzig]
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sensor ,ontology ,[INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation ,W3C recommendation ,[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation ,OGC standard - Abstract
International audience; The Semantic Sensor Network Ontology, popularly knownasSSN, was developed by an Incubator Group of the World Wide WebConsortium (W3C) over 2009 to 2011. Subsequently, the W3C and theOpen Geospatial Consortium (OGC) joined forces to update the SSNas informed by experience, to harmonize it with OGC’s O&M, and topublish a new version to be endorsed as both a W3C Recommendationand an OGC standard in late 2017. The major contribution of the newSSN is a modular structure designed to be more convenient for ontologyengineers and data custodians. It also slightly extends the coverage ofthe previous SSN with new terms for sampling and actuation. SSN re-tains the ability to comprehensively represent:sensorsin terms of whatthey can sense, and what and how they do sense;observationsin termsof what they measure and what values they find;systems(or networks)of sensors in terms of sensor components and how they are deployed;andreal-world objects(calledfeatures of interest, OGC-style) in terms oftheir physical properties, what can sense them, and what observations ofthem have been made. A few little-used SSN terms have been deprecated,and several others have been renamed. For a comprehensive descriptionof new SSN the reader is referred to the specification [10]. A full descrip-tion of the scope, design rationale and additions, with examples of itsapplication are presented in [11].
- Published
- 2019
13. Improving Editorial Workflow and Metadata Quality at Springer Nature
- Author
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Ghidini, C, Hartig, O, Maleshkova, M, Svátek, V, Cruz, I, Hogan, A, Song, J, Lefrançois, M, Gandon, F, Salatino, A, Osborne, F, Birukou, A, Motta, E, Salatino AA, Osborne F, Birukou A, Motta E, Ghidini, C, Hartig, O, Maleshkova, M, Svátek, V, Cruz, I, Hogan, A, Song, J, Lefrançois, M, Gandon, F, Salatino, A, Osborne, F, Birukou, A, Motta, E, Salatino AA, Osborne F, Birukou A, and Motta E
- Abstract
Identifying the research topics that best describe the scope of a scientific publication is a crucial task for editors, in particular because the quality of these annotations determine how effectively users are able to discover the right content in online libraries. For this reason, Springer Nature, the world’s largest academic book publisher, has traditionally entrusted this task to their most expert editors. These editors manually analyse all new books, possibly including hundreds of chapters, and produce a list of the most relevant topics. Hence, this process has traditionally been very expensive, time-consuming, and confined to a few senior editors. For these reasons, back in 2016 we developed Smart Topic Miner (STM), an ontology-driven application that assists the Springer Nature editorial team in annotating the volumes of all books covering conference proceedings in Computer Science. Since then STM has been regularly used by editors in Germany, China, Brazil, India, and Japan, for a total of about 800 volumes per year. Over the past three years the initial prototype has iteratively evolved in response to feedback from the users and evolving requirements. In this paper we present the most recent version of the tool and describe the evolution of the system over the years, the key lessons learnt, and the impact on the Springer Nature workflow. In particular, our solution has drastically reduced the time needed to annotate proceedings and significantly improved their discoverability, resulting in 9.3 million additional downloads. We also present a user study involving 9 editors, which yielded excellent results in term of usability, and report an evaluation of the new topic classifier used by STM, which outperforms previous versions in recall and F-measure.
- Published
- 2019
14. Astrid project, from conceptual to basic design progress status
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Varaine, F., Rodriguez, G., Settimo, D., Hamy, Jm., Romdhane, S., Benard, Rp., Remy, A., Hayafune, H., Chauveau, T., Helle, Jp., Gautier, V., Mochida, H., Lambert, G., Iitsuka, T., Fukuie, M., Lefrançois, M., Mazel, Jl., amplexor, amplexor, CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
- Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th] ,SFR ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,Basic Design ,GEN IV ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,ASTRID - Abstract
International audience; Since the beginning of this year, after 6 years of conceptual design phase, the French 600 eMW ASTRID project has started a 4 years basic design phase. The ASTRID project is funding for basic design phase (2016-2019) through France Future Investments Program. All the Industrials partners involved in the project during the last phase have decided to pursue in the ASTRID project, and the strategic partnership with Japan is going to be reinforced. This very efficient industrial network with CEA as contracting authority is an original and effective project management. Very high level and up-to-date project management methods are performed, including technical control with engineering System tools and 3D mock-up consolidation. On the technical point of view, the first ten months have been kept for a reopening options phase called P2C (Configuration Confirmation Phase) concluded by a configuration review in October. According to conclusions of conceptual design phases, several items had been checked and challenged through three main drivers safety, cost killing and operability. Global consistency was also watched over.It has been also decided for the next two years, to investigate and integrate Gas Power Conversion System in the basic design configuration. The objective for the ASTRID project is to raise Gas PCS integration studies at the same level that was achieved for Water/steam PCS at the end of 2015. A go-no go decision for Gas PCS integration will be organized at the end of 2017.In the same time an ongoing effort started two years ago is underway to map all the qualification needs and define all joined processes consistent with safety regulator requirement. A more realistic planning has been prepared, adding a four years consolidation phase between basic design and detailed design, in order to increase the level of confidence and progress on the technology feasibility including experimental validations of the ASTRID's main innovative options.
- Published
- 2017
15. Status of the astrid sodium fast reactor project from conceptualdesign to basic design phase
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Varaine, F., Rodriguez, G., Settimo, D., Hamy, Jm., Hayafune, H., Romdhane, S., Benard, Rp., Remy, A., Chauveau, T., Vandendriesche, L., Lambert, G., Helle, Jp., Mochida, H., Iitsuka, T., Robertson, D., Lefrançois, M., Fukuie, M., Mazel, Jl., amplexor, amplexor, CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
- Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,Basic Design ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,ASTRID ,Sodium Fast Reactor - Abstract
International audience; The ASTRID project is pursuing its progress and has reached at the end of 2015 the Conceptual Design phasefollowed by the starting of the Basic Design phase from 2016 to 2019.The transition from the Conceptual Design phase (2010-2015) to the Basic Design phase (2016-2019) was validated by theproduction of the Conceptual Design files. According to the production of this report, at the end of the Conceptual Designphase (December 2015), the French ministries representatives agreed to launch the Basic Design Phase due to the goodprogression of the program all the milestones have been met during the Conceptual Design phase, and relevant innovationshave been proposed in order to propose a technological demonstration reactor that could fulfilled Generation IV objectives.For the Basic Design phase, the ASTRID project has consolidated its industrial partnership with fourteen industrial partnersespecially strengthened with JAEA / MHI MFBR.The Basic Design phase started with a particular step named Confirmation Configuration Phase (P2C) where during the firstnine months of the 2016 year, the project - with all partners has- re-analyzed several structural options regarding three main drivers safety, operability and cost killing,- implemented the Gas (Nitrogen) Energy Conversion system within the plant design,- and built a coherent reactor layout shared by all partners as a starting point of a new ASTRID configuration forthe Basic Design phase.Therefore, this papers aims at presenting the recent progress of the ASTRID project either in terms of project managementand organization, than in terms of technological progress in reactor design and support studies.
- Published
- 2017
16. Real-time 200 Gb/s 8-QAM transmission over a 1800-km long SSMF-based system using add/drop 50 GHz-wide filters
- Author
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Lavigne, B., primary, Lefrançois, M., additional, Bertran-Pardo, O., additional, Le Monnier, M., additional, Raddatz, L., additional, Weisser, S., additional, Peruta, R., additional, Azzini, G. A., additional, and Suberini, L., additional
- Published
- 2016
- Full Text
- View/download PDF
17. Theories des champs topologiques et mecanique quantique en espace non-commutatif
- Author
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Lefrançois, M., Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Claude Bernard - Lyon I, and François Gieres(f.gieres@ipnl.in2p3.fr)
- Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph] - Abstract
Theorie; In particle physics, the Standard Model describes the interactions between fundamental particles. However, it was not able until now to unify quantum field theory and general relativity. This PhD thesis focuses on two different unification approaches, though they might show some compatibility: topological field theories and quantum mechanics on noncommutative space.Topological field theories have been introduced by Witten some twenty years ago and have a very strong link to mathematics: their observables are topological invariants of the manifold they are defined on. In this thesis, we firs give interest to topological Yang-Mills. We develop a superspace formalism and give a systematic method of determination of the observables. This approach allows, once projected on a particular supergauge (of Wess-Zumino type), to recover the existing results but it also gives a generalisation to the case of an unspecified supergauge. We have then be able to show that the up-to-now known observables correspond to the most general form of the solutions. This superspace formalism can be applied to more complex models; the case of topological gravity is given here in example.Quantum mechanics on noncommutative space provides an extension of the Heisenberg algebra of ordinary quantum mechanics. What differs here is that the components of the position or momentum operators do not commute with each other anymore. This implies to introduce a fundamental length. The second part of this thesis focuses on the description of the commutation algebra. Applications are made to low-dimensional quantum systems (Landau system, harmonic oscillator...) and to supersymmetric systems.; Le Modèle Standard de la physique des particules décrit les interactions entre les constituants élémentaires de la matière. Cependant, il ne parvient pas à concilier théorie quantique des champs et relativité générale. Cette thèse se focalise sur deux approches au-delà du Modèle Standard, a priori différentes mais non nécessairementincompatibles entre elles : les théories des champs topologiques et la mécanique quantique en espace non-commutatif.Les théories topologiques ont été introduites par Witten il y a une vingtaine d'années et possèdent un lien très étroit avec les mathématiques : leurs observablessont des invariants topologiques de la variété d'espace-temps étudiée. Dans ce mémoire, nous nous intéressons en premier lieu à une théorie de Yang-Mills topologique. Ce modèle-jouet est ici abordé dansun formalisme de superespace et nous dégageons une méthode systématique de détermination de ses observables. L'intérêt est double : d'une part,retrouver les résultats obtenus précédemment dans une jauge particulière (de Wess et Zumino) et d'autre part, calculer les observables dans une superjauge quelconque. Notre approche a ainsi permis de vérifier que les observables découvertes jusque là en théorie deYang-Mills topologique étaient les seules possibles. Le formalisme développé peut ensuite être appliqué à desmodèles plus complexes; dans cette optique, nous détaillons ici le cas de la gravité topologique.La mécanique quantique en espace non-commutatif propose une extension de l'algèbre de Heisenbergde la mécanique quantique ordinaire. La différence tient au fait que les différentes composantes des opérateurs position ou moment ne commutent plus entre elles. Par conséquent, il est nécessaire de renoncer à la notion de point en introduisant une «longueur fondamentale». Nous nous intéressons dans la deuxième partie de cemanuscrit à la description des différentes algèbres decommutateurs rencontrées. Des applications à des systèmes quantiques en dimension deux (système de Landau, oscillateur harmonique,...) ainsi qu'une généralisation au cas de systèmes supersymétriques sont présentées.
- Published
- 2005
18. Topological field theories and quantum mechanics on commutative space
- Author
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Lefrançois, M. and Flores, Sylvie
- Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.MPHY] Physics [physics]/Mathematical Physics [math-ph] - Abstract
In particle physics, the Standard Model describes the interactions between fundamental particles. However, it was not able until now to unify quantum field theory and general relativity. This PhD thesis focuses on two different unification approaches, though they might show some compatibility: topological field theories and quantum mechanics on noncommutative space.Topological field theories have been introduced by Witten some twenty years ago and have a very strong link to mathematics: their observables are topological invariants of the manifold they are defined on. In this thesis, we firs give interest to topological Yang-Mills. We develop a superspace formalism and give a systematic method of determination of the observables. This approach allows, once projected on a particular supergauge (of Wess-Zumino type), to recover the existing results but it also gives a generalisation to the case of an unspecified supergauge. We have then be able to show that the up-to-now known observables correspond to the most general form of the solutions. This superspace formalism can be applied to more complex models; the case of topological gravity is given here in example.Quantum mechanics on noncommutative space provides an extension of the Heisenberg algebra of ordinary quantum mechanics. What differs here is that the components of the position or momentum operators do not commute with each other anymore. This implies to introduce a fundamental length. The second part of this thesis focuses on the description of the commutation algebra. Applications are made to low-dimensional quantum systems (Landau system, harmonic oscillator...) and to supersymmetric systems., Le Modèle Standard de la physique des particules décrit les interactions entre les constituants élémentaires de la matière. Cependant, il ne parvient pas à concilier théorie quantique des champs et relativité générale. Cette thèse se focalise sur deux approches au-delà du Modèle Standard, a priori différentes mais non nécessairementincompatibles entre elles : les théories des champs topologiques et la mécanique quantique en espace non-commutatif.Les théories topologiques ont été introduites par Witten il y a une vingtaine d'années et possèdent un lien très étroit avec les mathématiques : leurs observablessont des invariants topologiques de la variété d'espace-temps étudiée. Dans ce mémoire, nous nous intéressons en premier lieu à une théorie de Yang-Mills topologique. Ce modèle-jouet est ici abordé dansun formalisme de superespace et nous dégageons une méthode systématique de détermination de ses observables. L'intérêt est double : d'une part,retrouver les résultats obtenus précédemment dans une jauge particulière (de Wess et Zumino) et d'autre part, calculer les observables dans une superjauge quelconque. Notre approche a ainsi permis de vérifier que les observables découvertes jusque là en théorie deYang-Mills topologique étaient les seules possibles. Le formalisme développé peut ensuite être appliqué à desmodèles plus complexes; dans cette optique, nous détaillons ici le cas de la gravité topologique.La mécanique quantique en espace non-commutatif propose une extension de l'algèbre de Heisenbergde la mécanique quantique ordinaire. La différence tient au fait que les différentes composantes des opérateurs position ou moment ne commutent plus entre elles. Par conséquent, il est nécessaire de renoncer à la notion de point en introduisant une «longueur fondamentale». Nous nous intéressons dans la deuxième partie de cemanuscrit à la description des différentes algèbres decommutateurs rencontrées. Des applications à des systèmes quantiques en dimension deux (système de Landau, oscillateur harmonique,...) ainsi qu'une généralisation au cas de systèmes supersymétriques sont présentées.
- Published
- 2005
19. 400Gb/s Trials on Commercial Systems Using Real-time Bit-rate-adaptive Transponders for Next Generation Networks
- Author
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Lavigne, B., primary, Bertran-Pardo, O., additional, Bresson, C., additional, Lefrançois, M., additional, Balmefrezol, E., additional, Le Monnier, M., additional, Raddatz, L., additional, and Suberini, L., additional
- Published
- 2015
- Full Text
- View/download PDF
20. 400Gb/s Real-time Trials on Commercial Systems Using Bit-rate-adaptive Transponders for Next Generation Networks
- Author
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Lavigne, B., primary, Bertran-Pardo, O., additional, Bresson, C., additional, Lefrançois, M., additional, Balmefrezol, E., additional, Le Monnier, M., additional, Raddatz, L., additional, and Suberini, L., additional
- Published
- 2014
- Full Text
- View/download PDF
21. Viscoplastic behavior of a FeCrAl alloy for high temperature steam electrolysis (HTSE) sealing applications between 700°C and 900°C
- Author
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Bérard, P., primary, Bartout, J.-D., additional, Reytier, M., additional, Lefrançois, M., additional, and Besson, J., additional
- Published
- 2011
- Full Text
- View/download PDF
22. Performance comparison of 40G and 100G coherent PDM-QPSK for upgrading dispersion managed legacy systems
- Author
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Renaudier, J., primary, Bertran-Pardo, O., additional, Mardoyan, H., additional, Tran, P., additional, Charlet, G., additional, Bigo, S., additional, Lefrançois, M., additional, Lavigne, B., additional, Augé, J-L., additional, Piriou, L., additional, and Courtois, O., additional
- Published
- 2009
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23. Impact of very large cumulated dispersion on performance of 40 Gbit∕s submarine systems over nonzero dispersion shifted fibres
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Lefrançois, M., primary, Charlet, G., additional, and Bigo, S., additional
- Published
- 2006
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- View/download PDF
24. Upgrade of 10 Gbit∕s ultra-long-haul system to 40 Gbit∕s with APol RZ-DPSK modulation format
- Author
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Charlet, G., primary, Mardoyan, H., additional, Tran, P., additional, Klekamp, A., additional, Astruc, M., additional, Lefrançois, M., additional, and Bigo, S., additional
- Published
- 2005
- Full Text
- View/download PDF
25. Time evolution of the diffraction pattern of an ultrashort laser pulse
- Author
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Lefrançois, M., primary and Pereira, S. F., additional
- Published
- 2003
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26. Topological Yang-Mills Theories and their Observables: A Superspace Approach
- Author
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Boldo, J. L., primary, Constantinidis, C. P., additional, Piguet, O., additional, Gieres, F., additional, and Lefrançois, M., additional
- Published
- 2003
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- View/download PDF
27. Parametric instability of a pendulum
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Curzon, F. L., primary, Loke, A. L. H., additional, Lefrançois, M. E., additional, and Novik, K. E., additional
- Published
- 1995
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28. Coherence Energies of Turbulent Flow
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Ahlborn, B., primary, Kevlahan, N., additional, and Lefrançois, M., additional
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- 1991
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29. Energy Storage and Exchange Mechanisms in Turbulent Media
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Ahlborn, B., primary, Seto, M., additional, and Lefrançois, M., additional
- Published
- 1991
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30. Low concentrations of acridine dimers inhibit Micrococcus AP endonuclease through interaction with apurinic sites in DNA
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Malvy, C., primary, Pierre, J., additional, Lefrançois, M., additional, Markovits, J., additional, Garbay, C., additional, and Roques, B., additional
- Published
- 1990
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31. Low-load metal seals to replace elastomer O-rings: the Helicoflex-delta (Δ) seals
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Lefrançois, M., primary, Montuclard, J., additional, and Rouaud, C., additional
- Published
- 1990
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32. Ocular Subconjunctival Lymphoscintigraphy in Unilateral Chemosis
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Levasseur A, Taillefer R, and Lefrançois M
- Subjects
Adult ,Male ,Chemosis ,medicine.medical_specialty ,business.industry ,Technetium ,General Medicine ,Conjunctival Diseases ,Ophthalmology ,Technetium Tc 99m Sulfur Colloid ,Methods ,medicine ,Edema ,Humans ,Radiology, Nuclear Medicine and imaging ,Colloids ,medicine.symptom ,business ,Conjunctiva ,Lymphoscintigraphy ,Sulfur - Published
- 1982
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33. Upgrade of 10Gbit/s ultra-long-haul system to 40 Gbit/s with APoI RZ-DPSK modulation format.
- Author
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Charlet, G., Mardoyan, H., Tran, P., Kiekamp, A., Astruc, M., Lefrançois, M., and Bigo, S.
- Subjects
DISPERSION (Chemistry) ,OPTICS ,DATA transmission systems ,TELECOMMUNICATION ,DIGITAL communications ,ELECTRONIC systems - Abstract
It is demonstrated that ultra-long-haul links at 10 Gbit/s could be upgraded to 40 Gbit/s without any change to the infrastructure (fibre arrangement, amplifiers, dispersion map). The system capacity is doubled with alternate-polarisation RZ-DPSK modulation format. [ABSTRACT FROM AUTHOR]
- Published
- 2005
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34. Latest developments on valve seat-seal assembly
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De Villepoix, R., Lefrancois, M., Montuclard, J., and Rouaud, C.
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- 1995
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35. What joining method for the new generation of accelerators (SSC and LHC)
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Montuclard, J, Lefrancois, M, and Rouaud, Ch
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- 1993
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36. Improving Editorial Workflow and Metadata Quality at Springer Nature
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Aliaksandr Birukou, Enrico Motta, Francesco Osborne, Angelo Antonio Salatino, Ghidini, C, Hartig, O, Maleshkova, M, Svátek, V, Cruz, I, Hogan, A, Song, J, Lefrançois, M, Gandon, F, Salatino, A, Osborne, F, Birukou, A, and Motta, E
- Subjects
FOS: Computer and information sciences ,Computer Science - Machine Learning ,Computer science ,Process (engineering) ,Computer Science - Artificial Intelligence ,media_common.quotation_subject ,02 engineering and technology ,01 natural sciences ,Machine Learning (cs.LG) ,Task (project management) ,Computer Science - Information Retrieval ,World Wide Web ,Scholarly ontologie ,Topic classification ,0202 electrical engineering, electronic engineering, information engineering ,Scholarly data ,Digital Libraries (cs.DL) ,Quality (business) ,Topic detection ,Data mining ,media_common ,Scope (project management) ,business.industry ,010401 analytical chemistry ,020207 software engineering ,Usability ,Computer Science - Digital Libraries ,Discoverability ,0104 chemical sciences ,Artificial Intelligence (cs.AI) ,Workflow ,Publishing ,business ,Bibliographic metadata ,Information Retrieval (cs.IR) - Abstract
Identifying the research topics that best describe the scope of a scientific publication is a crucial task for editors, in particular because the quality of these annotations determine how effectively users are able to discover the right content in online libraries. For this reason, Springer Nature, the world's largest academic book publisher, has traditionally entrusted this task to their most expert editors. These editors manually analyse all new books, possibly including hundreds of chapters, and produce a list of the most relevant topics. Hence, this process has traditionally been very expensive, time-consuming, and confined to a few senior editors. For these reasons, back in 2016 we developed Smart Topic Miner (STM), an ontology-driven application that assists the Springer Nature editorial team in annotating the volumes of all books covering conference proceedings in Computer Science. Since then STM has been regularly used by editors in Germany, China, Brazil, India, and Japan, for a total of about 800 volumes per year. Over the past three years the initial prototype has iteratively evolved in response to feedback from the users and evolving requirements. In this paper we present the most recent version of the tool and describe the evolution of the system over the years, the key lessons learnt, and the impact on the Springer Nature workflow. In particular, our solution has drastically reduced the time needed to annotate proceedings and significantly improved their discoverability, resulting in 9.3 million additional downloads. We also present a user study involving 9 editors, which yielded excellent results in term of usability, and report an evaluation of the new topic classifier used by STM, which outperforms previous versions in recall and F-measure., In: The Semantic Web - ISWC 2019. Lecture Notes in Computer Science, vol 11779. Springer, Cham
- Published
- 2019
37. Plant-based diets enriched with linseed oil or marine algae modify sperm lipid profiles and fertility parameters in broiler breeders.
- Author
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Coss, C., Brèque, C., Venne, D., Lefrançois, M. R., Chouinard, Y., Vandenberg, G., and Bailey, J. L.
- Subjects
- *
BROILER chickens - Abstract
The article presents an abstract of the research paper "Plant-based diets enriched with linseed oil or marine algae modify sperm lipid profiles and fertility parameters in broiler breeders," by C. Coss and colleagues.
- Published
- 2008
38. [Overview of the French Memory Centres healthcare pathway for patients with early Alzheimer disease].
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Ceccaldi M, Monteil-Hautin V, Chevrette A, Lebouvier T, Lefrançois M, Wallon D, Volpe-Gillot L, Dumas E, and Soto M
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- Humans, France, Aged, Male, Female, Aged, 80 and over, Critical Pathways, Alzheimer Disease therapy, Alzheimer Disease psychology, Referral and Consultation
- Abstract
The growing prevalence of the Alzheimer's disease (AD) is an increasing public health concern that led to French recommendations for timely AD diagnosis and patient management as well as a territorial coverage of specialized structures [Memory Centers including Resources and Memory Research Centers (RMRC) and Memory Consultations (MC)]. In view of the potential availability of Disease Modifying Therapies (DMTs), this French observatory aimed to describe the current organization of the Memory Centers, and the care pathway of patients suffering from early AD. Overall, 12 of the 28 RMRC and 44 of the 250 MC solicited by the Federation of Memory Centers participated in this study. RMRC and MC differed in the practicing specialists (neurologists in 100 % and 41 % of the structures, respectively; geriatricians in 58 % and 95 %), and in the median yearly number of patients with early AD (192 and 99). The majority of patients were referred to RMRC and MC by a general practitioner (42 % and 51 %, respectively) or a private neurologist (19 % and 6 %). The time between referral and the first visit to the Memory Center was shorter in MC compared to RMRC (<3 months: 51 % versus 34 %). Cerebrospinal fluid biomarkers were assessed in the majority of patients in 75 % of RMRC and 14 % of MC. A care plan was proposed for the majority of patients whatever the Memory Center was (RMRC: 91 %, MC: 84 %) unlike psychological support (21 % and 29 %, respectively) and therapeutic education (14 % and 9 %). According to more than 2/3 of the RMRC the referral delays, the number of patients with early AD, and the monitoring schedule (including MRIs and clinical assessments) will be very impacted by the potential availability of DMTs. A similar impact was only perceived by around half of the MC. This study highlighted the key challenges raised by these new therapies.
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- 2024
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39. The CNK-HYP scaffolding complex promotes RAF activation by enhancing KSR-MEK interaction.
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Maisonneuve P, Sahmi M, Bergeron-Labrecque F, Ma XI, Queguiner J, Arseneault G, Lefrançois M, Kurinov I, Fronzes R, Sicheri F, and Therrien M
- Subjects
- Animals, Humans, Cryoelectron Microscopy, raf Kinases metabolism, raf Kinases chemistry, Protein Binding, Protein Multimerization, Models, Molecular, Drosophila melanogaster metabolism, Mitogen-Activated Protein Kinase Kinases metabolism, Protein Kinases, ras Proteins, Drosophila Proteins metabolism, Drosophila Proteins chemistry, Drosophila Proteins genetics
- Abstract
The RAS-MAPK pathway regulates cell proliferation, differentiation and survival, and its dysregulation is associated with cancer development. The pathway minimally comprises the small GTPase RAS and the kinases RAF, MEK and ERK. Activation of RAF by RAS is notoriously intricate and remains only partially understood. There are three RAF isoforms in mammals (ARAF, BRAF and CRAF) and two related pseudokinases (KSR1 and KSR2). RAS-mediated activation of RAF depends on an allosteric mechanism driven by the dimerization of its kinase domain. Recent work on human RAFs showed that MEK binding to KSR1 promotes KSR1-BRAF heterodimerization, which leads to the phosphorylation of free MEK molecules by BRAF. Similar findings were made with the single Drosophila RAF homolog. Here we show that the fly scaffold proteins CNK and HYP stabilize the KSR-MEK interaction, which in turn enhances RAF-KSR heterodimerization and RAF activation. The cryogenic electron microscopy structure of the minimal KSR-MEK-CNK-HYP complex reveals a ring-like arrangement of the CNK-HYP complex allowing CNK to simultaneously engage KSR and MEK, thus stabilizing the binary interaction. Together, these results illuminate how CNK contributes to RAF activation by stimulating the allosteric function of KSR and highlight the diversity of mechanisms impacting RAF dimerization as well as the regulatory potential of the KSR-MEK interaction., (© 2024. The Author(s).)
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- 2024
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40. French national survey on breast cancer care: caregiver and patient views.
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Rousset-Jablonski C, Lortal B, Lantheaume S, Arnould L, Simon H, Tuszynski AS, Courtier M, Debbah S, Lefrançois M, Balbin S, Kably AS, and Toledano A
- Subjects
- Humans, Female, France, Adult, Middle Aged, Surveys and Questionnaires, Caregivers psychology, Patient Satisfaction, Aged, Quality of Health Care, Breast Neoplasms therapy, Breast Neoplasms pathology
- Abstract
Purpose: To improve the quality of care for patients with breast cancer, an analysis of the health-care pathway, considering feedback from both health-care practitioners (HCPs) and patients, is needed., Methods: Between 2020 and 2022, we conducted a survey at French breast cancer centers and analyzed information from questionnaires completed by HCPs and patients. We collected information on center organization, diagnostic processes, treatment decisions and modalities, supportive care, patient advocacy groups, and work issues., Results: Twenty-three breast cancer centers were included and questionnaires completed by 247 HCPs and 249 patients were analyzed. The centers closely followed the legal French framework for cancer treatments, which includes formal diagnostic announcements, multidisciplinary tumor boards, personalized treatment summaries, and supportive care access. HCPs and patients were satisfied with the time to diagnosis (≤ 2 weeks as evaluated by 75% of patients), time to surgery (mean 61 days), time between surgery and chemotherapy (mean 47 days), and time between surgery and radiotherapy (mean 81 days). Fertility preservation counseling for women under 40 years of age was systematically offered by 67% of the HCPs. The majority (67%) of the patients indicated that they had received a personalized treatment summary; the topics discussed included treatments (92%), tumor characteristics (84%), care pathways (79%), supportive care (52%), and breast reconstruction (33%). Among HCPs, 44% stated that reconstructive surgery was offered to all eligible patients and 57% and 45% indicated coordination between centers and primary care physicians for adverse effects management and access to supportive care should be improved, for chemotherapy and radiotherapy, respectively. Regarding patient advocacy groups, 34% of HCPs did not know whether patients had contact and only 23% of patients declared that they had such contact. For one-third of working patients, work issues were not discussed. Twenty-eight percent of patients claimed that they had faced difficulties for supportive care access. Among HCPs, 13% stated that a formal personalized survivorship treatment program was administered to almost all patients and 37% almost never introduced the program to their patients. Compliance to oral treatments was considered very good for 75-100% of patients by 62% of HCPs., Conclusions: This study provides an updated analysis of breast cancer care pathways in France. Overall, the initial processes of diagnosis, announcement, and treatment were swift and were in agreement with the best care standards. No barriers to accessing care were identified. Based on the study findings, we proposed several strategies to improve the quality of care for patients in supportive care, coordination with primary care physicians, reconstructive surgery, and fertility preservation access., (© 2024. The Author(s).)
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- 2024
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41. Profiles, diagnostic process, and patterns of care of patients with stage III non-small cell lung cancer: A French national study.
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Auliac JB, Greillier L, Martin E, Falcoz PE, Boisselier P, Ano S, Lefrançois M, and Cortot A
- Subjects
- Humans, France epidemiology, Female, Male, Middle Aged, Retrospective Studies, Aged, Positron Emission Tomography Computed Tomography, Practice Patterns, Physicians' statistics & numerical data, Magnetic Resonance Imaging statistics & numerical data, Pneumonectomy statistics & numerical data, Carcinoma, Non-Small-Cell Lung therapy, Carcinoma, Non-Small-Cell Lung pathology, Carcinoma, Non-Small-Cell Lung diagnosis, Carcinoma, Non-Small-Cell Lung epidemiology, Lung Neoplasms therapy, Lung Neoplasms pathology, Lung Neoplasms diagnosis, Lung Neoplasms epidemiology, Neoplasm Staging
- Abstract
Background: The management of stage III non-small-cell lung cancer (NSCLC) remains heterogeneous and complex, even after the approval of immune checkpoint inhibitors post-chemoradiotherapy (CRT). This observational study from France evaluated real-world practices in managing stage III NSCLC., Methods: Between 2020 and 2022, we conducted a physician practice survey in 41 medical centers across France, and retrospectively analyzed aggregated information from 417 consecutive charts of patients with stage III NSCLC. We collected information on diagnostic and staging procedures, biomarker testing, surgical and non-surgical treatments, and follow-up., Results: According to the physician survey, diagnostic workup of stage III NSCLC primarily relied on positron emission tomography/computed tomography and brain magnetic resonance imaging, performed for the majority of patients in 100 % and 78 % of centers, respectively. Of 417 patient charts, 414 were evaluable with 53 % of patients having stage IIIA disease, 37 % IIIB, and 10 % IIIC. The most common node involvement was N2 (59 %). Programmed death-ligand 1 testing was conducted for 98 % of patients. Invasive staging (mediastinoscopy or endobronchial ultrasound) was performed in 41 % of patients, of whom 83 % had N2 or N3 nodal involvement. Surgical resection was offered to 120 patients (29 %), with 85 % achieving R0 resection. In 292 charts of patients with unresectable stage III NSCLC, 190 patients (65 %) were offered CRT followed by consolidation immunotherapy. Within these patients, concurrent CRT was more frequently employed (52 %) than sequential CRT (13 %)., Conclusions: Diagnostic procedures and treatment modalities in French medical centers generally align with clinical guidelines for stage III NSCLC, except for invasive staging that was less commonly performed than expected., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Jean-Bernard Auliac reports financial support was provided by AstraZeneca. Jean-Bernard Auliac reports a relationship with AstraZeneca that includes: consulting or advisory, paid expert testimony, speaking and lecture fees, and travel reimbursement. Jean-Bernard Auliac reports a relationship with Takeda Pharmaceutical Company Limited that includes: consulting or advisory and paid expert testimony. Jean-Bernard Auliac reports a relationship with Bristol Myers Squibb Co that includes: consulting or advisory, paid expert testimony, and travel reimbursement. Jean-Bernard Auliac reports a relationship with Janssen Pharmaceuticals Inc that includes: consulting or advisory, paid expert testimony, and speaking and lecture fees. Jean-Bernard Auliac reports a relationship with Amgen Inc that includes: consulting or advisory, paid expert testimony, and speaking and lecture fees. Jean-Bernard Auliac reports a relationship with MSD France SAS that includes: speaking and lecture fees and travel reimbursement. Jean-Bernard Auliac reports a relationship with Sanofi that includes: paid expert testimony, speaking and lecture fees, and travel reimbursement. Jean-Bernard Auliac reports a relationship with Boehringer Ingelheim GmbH that includes: travel reimbursement. Laurent Greillier reports a relationship with Bristol Myers Squibb Co that includes: funding grants and speaking and lecture fees. Laurent Greillier reports a relationship with MSD France SAS that includes: funding grants, speaking and lecture fees, and travel reimbursement. Laurent Greillier reports a relationship with Takeda Pharmaceutical Company Limited that includes: funding grants, speaking and lecture fees, and travel reimbursement. Laurent Greillier reports a relationship with Pfizer that includes: funding grants, speaking and lecture fees, and travel reimbursement. Laurent Greillier reports a relationship with Roche that includes: funding grants and speaking and lecture fees. Laurent Greillier reports a relationship with Amgen Inc that includes: funding grants and speaking and lecture fees. Laurent Greillier reports a relationship with Sanofi that includes: funding grants and speaking and lecture fees. Laurent Greillier reports a relationship with Janssen Pharmaceuticals Inc that includes: funding grants and speaking and lecture fees. Laurent Greillier reports a relationship with Eli Lilly and Company that includes: funding grants and speaking and lecture fees. Laurent Greillier reports a relationship with Novartis that includes: funding grants and speaking and lecture fees. Laurent Greillier reports a relationship with AstraZeneca that includes: travel reimbursement. Etienne Martin reports a relationship with AstraZeneca that includes: consulting or advisory, speaking and lecture fees, and travel reimbursement. Etienne Martin reports a relationship with Varian Medical Systems Inc that includes: speaking and lecture fees. Etienne Martin reports a relationship with Sanofi that includes: speaking and lecture fees. Etienne Martin reports a relationship with Ipsen that includes: speaking and lecture fees and travel reimbursement. Etienne Martin reports a relationship with MSD France SAS that includes: speaking and lecture fees. Etienne Martin reports a relationship with Janssen Pharmaceuticals Inc that includes: consulting or advisory and travel reimbursement. Sabine Ano reports a relationship with AstraZeneca that includes: employment. Marc Lefrancois reports a relationship with CMI Group that includes: employment and equity or stocks. Marc Lefrancois reports a relationship with AstraZeneca that includes: consulting or advisory. Alexis Cortot reports a relationship with Roche that includes: funding grants and paid expert testimony. Alexis Cortot reports a relationship with Novartis that includes: consulting or advisory, paid expert testimony, speaking and lecture fees, and travel reimbursement. Alexis Cortot reports a relationship with Sanofi that includes: speaking and lecture fees. Alexis Cortot reports a relationship with Pfizer that includes: paid expert testimony and speaking and lecture fees. Alexis Cortot reports a relationship with Takeda Pharmaceutical Company Limited that includes: paid expert testimony, speaking and lecture fees, and travel reimbursement. Alexis Cortot reports a relationship with Janssen Pharmaceuticals Inc that includes: paid expert testimony. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 SPLF and Elsevier Masson SAS. All rights reserved.)
- Published
- 2024
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42. CNK2 promotes cancer cell motility by mediating ARF6 activation downstream of AXL signalling.
- Author
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Serwe G, Kachaner D, Gagnon J, Plutoni C, Lajoie D, Duramé E, Sahmi M, Garrido D, Lefrançois M, Arseneault G, Saba-El-Leil MK, Meloche S, Emery G, and Therrien M
- Subjects
- Humans, Mice, Animals, Phosphatidylinositol 3-Kinases metabolism, ADP-Ribosylation Factor 6, Signal Transduction physiology, Cell Movement physiology, rac1 GTP-Binding Protein metabolism, ADP-Ribosylation Factors metabolism, Neoplasms genetics
- Abstract
Cell motility is a critical feature of invasive tumour cells that is governed by complex signal transduction events. Particularly, the underlying mechanisms that bridge extracellular stimuli to the molecular machinery driving motility remain partially understood. Here, we show that the scaffold protein CNK2 promotes cancer cell migration by coupling the pro-metastatic receptor tyrosine kinase AXL to downstream activation of ARF6 GTPase. Mechanistically, AXL signalling induces PI3K-dependent recruitment of CNK2 to the plasma membrane. In turn, CNK2 stimulates ARF6 by associating with cytohesin ARF GEFs and with a novel adaptor protein called SAMD12. ARF6-GTP then controls motile forces by coordinating the respective activation and inhibition of RAC1 and RHOA GTPases. Significantly, genetic ablation of CNK2 or SAMD12 reduces metastasis in a mouse xenograft model. Together, this work identifies CNK2 and its partner SAMD12 as key components of a novel pro-motility pathway in cancer cells, which could be targeted in metastasis., (© 2023. The Author(s).)
- Published
- 2023
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- View/download PDF
43. How to carry out participatory research that takes account of sex and gender issues: a scoping review of guidelines targeting health inequities.
- Author
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Lefrançois M, Sultan-Taïeb H, Webb J, Gervais MJ, Messing K, Blanchette-Luong V, Riel J, Saint-Charles J, Faust R, Vaillancourt C, Fillion M, and Laberge M
- Subjects
- Male, Female, Humans, Data Collection, Health Inequities, Community-Based Participatory Research, Gender Identity
- Abstract
Objective: Conducting participatory research (PR) aimed at improving health implies considering inequitable power relations, including those related to sex/gender (S/G). This necessitates specific skills and methods and may be challenging especially since guidelines are scarce. Our objective was to perform a scoping review to provide a typology of existing guidelines for researchers on how to take account of S/G in the context of PR in public health, with a focus on occupational and environmental health., Methods: All steps of the research were conducted with the collaboration of an advisory committee, following PR principles. Nineteen documents were retained from 513 references identified in nine scientific databases and grey literature between 2000 and 2020. Data on recommendations were extracted and coded qualitatively. Cluster analysis based on similarities in recommendations proposed in the documents identified four types: (1) empowerment-centered; (2) concrete action-centered; (3) macrosystem-centered; and (4) stakeholder-centered., Synthesis: Many sources gave pointers on how to include S/G during data collection and analysis or during the dissemination of findings, but there was a dearth of suggestions for building partnerships with stakeholders and producing sustainable S/G sociopolitical transformations. Occupational health PR showed less similarities with other public health subfields including environmental health PR. Power relationships with workplace stakeholders generated specific obstacles related to S/G integration that require further attention. Intersectionality and reflexive practices emerged as overarching themes., Conclusion: This review provides helpful guidelines to researchers at different stages of planning PR, ranging from familiarizing themselves with S/G approaches to anticipating difficulties in their ongoing S/G-transformative PR., (© 2023. The Author(s) under exclusive license to The Canadian Public Health Association.)
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- 2023
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- View/download PDF
44. Integration of sex and gender in interventions by students in ergonomics.
- Author
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Laberge M, Chadoin M, Inigo M, Messing K, Lefrançois M, Sultan-Taïeb H, Chatigny C, Riel J, Webb J, Fillion M, Vaillancourt C, and Bellemare M
- Subjects
- Male, Female, Humans, Inservice Training, Students, Ergonomics, Workplace
- Abstract
This article aims to analyse the integration of sex and gender (s/g) by ergonomics students during their internship at the master's degree level, following training sessions on s/g issues in the workplace. This exploratory research used a descriptive mixed-methods design, encompassing evaluation of students' intention to use the content from the training ( n = 13 students), and a multiple case study ( n = 5 ergonomics interventions). The results show that while students found the training relevant, they only minimally integrated s/g in their interventions and when they did, it was primarily from an anthropometric and physiological perspective. In addition to discussing the training format limitations, the article discusses barriers to this integration: combining learning about s/g issues with learning about activity analysis is challenging; employers' and workers' organisations may be reluctant to approach s/g issues; and it is difficult for an ergonomist to integrate these issues when the employer's request does not specify it. Practitioner summary: This article aims to analyse the integration of s/g by ergonomics students during their internships. Findings show that they only minimally considered s/g. The discussion examines s/g training, organisational obstacles to inclusion of s/g during interventions, and how ergonomists can consider s/g in their practice.
- Published
- 2022
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45. Gender and work in ergonomics: recent trends.
- Author
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Laberge M, Lefrançois M, Chadoin M, Probst I, Riel J, Casse C, and Messing K
- Subjects
- Male, Female, Humans, Sex Factors, Ergonomics, Knowledge
- Abstract
Since the establishment of the Gender and Work Technical Committee (TC) of the International Ergonomics Association (IEA) in 2006, many researchers have addressed the role of sex and gender in ergonomics, producing a great deal of new information. This special issue aims to present new ways of viewing women's work and gender differences in work-related injury risks in an era of rapidly changing labour market configurations. It offers innovative methods for integrating sex and gender into ergonomic analysis and for designing work environments. It shares reflections on the intersection of vulnerabilities according to certain identity markers. Finally, it contributes to establishing milestones standards of practice so that the consideration of sex and gender can be more systematically modelled in ergonomics research and interventions, for example, in training ergonomists or in knowledge transfer initiatives. Practitioner summary: This editorial article provides an overview of the background and the content of the Special Issue 'Gender and Work in Ergonomics: Recent trends'.
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- 2022
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46. Work-family balance in the construction industry: why gender analysis matters to develop sustainable interventions.
- Author
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Lefrançois M and Trottier M
- Subjects
- Female, Male, Humans, Workplace, Workload, Sex Factors, Construction Industry, Occupational Health
- Abstract
Work-family balance (WFB) in the construction sector has rarely been studied. Hardship, atypical schedules and seasonal work create challenging conditions for parents in this male-dominated industry. Semi-structured interviews with workers (14 men, 6 women) and a survey of 789 on-site workers (85% men, 15% women) were conducted as part of a wider participatory action-research project involving governmental actors. Triangulation of the interview and survey data clarified the influence of quantitative and qualitative workload and of managerial support on work-family conflict. Results also show that male and female workers have differentiated experiences of WF issues and, consequently, develop different WF strategies while pursuing increased flexibility. The stereotyped conception of WF encourages social norms that have various impacts on mothers and fathers working in the industry. Recommendations for a cultural shift are proposed for employers in this industry, marked by a labour shortage and low retention of female workers. Practitioner summary: This paper provides a gendered analysis of work-family issues among on-site workers in the construction industry. It aims to inform ergonomists and occupational health researchers about the potential of inflexible work designs to convey stereotypes that can impact the sustainability and equity of workplace interventions.
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- 2022
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47. CXCR4 signaling controls dendritic cell location and activation at steady state and in inflammation.
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Gallego C, Vétillard M, Calmette J, Roriz M, Marin-Esteban V, Evrard M, Aknin ML, Pionnier N, Lefrançois M, Mercier-Nomé F, Bertrand Y, Suarez F, Donadieu J, Ng LG, Balabanian K, Bachelerie F, and Schlecht-Louf G
- Subjects
- Alphapapillomavirus genetics, Animals, Benzylamines pharmacology, Cell Count, Cell Differentiation, Chemokine CXCL12 physiology, Chemotaxis, Cyclams pharmacology, Dendritic Cells classification, Epidermis pathology, Female, Gene Knock-In Techniques, Genes, Viral, Humans, Inflammation metabolism, Langerhans Cells physiology, Lymphoid Tissue pathology, Mice, Mice, Inbred C57BL, Mice, Inbred Strains, Mice, Transgenic, Organ Specificity, Parabiosis, Primary Immunodeficiency Diseases blood, Primary Immunodeficiency Diseases genetics, Primary Immunodeficiency Diseases pathology, Recombinant Proteins metabolism, Warts blood, Warts genetics, Warts pathology, Dendritic Cells physiology, Inflammation pathology, Primary Immunodeficiency Diseases physiopathology, Receptors, CXCR4 physiology, Warts physiopathology
- Abstract
Dendritic cells (DCs) encompass several cell subsets that collaborate to initiate and regulate immune responses. Proper DC localization determines their function and requires the tightly controlled action of chemokine receptors. All DC subsets express CXCR4, but the genuine contribution of this receptor to their biology has been overlooked. We addressed this question using natural CXCR4 mutants resistant to CXCL12-induced desensitization and harboring a gain of function that cause the warts, hypogammaglobulinemia, infections, and myelokathexis (WHIM) syndrome (WS), a rare immunodeficiency associated with high susceptibility to the pathogenesis of human papillomavirus (HPV). We report a reduction in the number of circulating plasmacytoid DCs (pDCs) in WHIM patients, whereas that of conventional DCs is preserved. This pattern was reproduced in an original mouse model of WS, enabling us to show that the circulating pDC defect can be corrected upon CXCR4 blockade and that pDC differentiation and function are preserved, despite CXCR4 dysfunction. We further identified proper CXCR4 signaling as a critical checkpoint for Langerhans cell and DC migration from the skin to lymph nodes, with corollary alterations of their activation state and tissue inflammation in a model of HPV-induced dysplasia. Beyond providing new hypotheses to explain the susceptibility of WHIM patients to HPV pathogenesis, this study shows that proper CXCR4 signaling establishes a migration threshold that controls DC egress from CXCL12-containing environments and highlights the critical and subset-specific contribution of CXCR4 signal termination to DC biology., (© 2021 by The American Society of Hematology.)
- Published
- 2021
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48. Emergency Surgery in Acute Diverticulitis: A Systematic Review.
- Author
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Beyer-Berjot L, Maggiori L, Loiseau D, De Korwin JD, Bongiovanni JP, Lesprit P, Salles N, Rousset P, Lescot T, Henriot A, Lefrançois M, Cotte E, and Parc Y
- Subjects
- Acute Disease, Anastomosis, Surgical, Humans, Laparoscopy, Peritoneal Lavage, Digestive System Surgical Procedures, Diverticulitis surgery, Emergencies
- Abstract
Background: Acute diverticulitis is a common disease with public health significance. Many studies with a high level of evidence have been published recently on the surgical management of acute diverticulitis., Objective: The aim of this systematic review was to define the accurate surgical management of acute diverticulitis., Data Sources: Medline, Embase, and the Cochrane Library were sources used., Study Selection: One reviewer conducted a systematic study with combinations of key words for the disease and the surgical procedure. Additional studies were searched in the reference lists of all included articles. The results of the systematic review were submitted to a working group composed of 13 practitioners. All of the conclusions were obtained by full consensus and validated by an external committee., Interventions: The interventions assessed were laparoscopic peritoneal lavage, primary resection with anastomosis with or without ileostomy, and the Hartmann procedure, with either a laparoscopic or an open approach., Main Outcome Measures: Morbidity, mortality, long-term stoma rates, and quality of life were measured., Results: Seventy-one articles were included. Five guidelines were retrieved, along with 4 meta-analyses, 14 systematic reviews, and 5 randomized controlled trials that generated 8 publications, all with a low risk of bias, except for blinding. Laparoscopic peritoneal lavage showed concerning results of deep abscesses and unplanned reoperations. Studies on Hinchey III/IV diverticulitis showed similar morbidity and mortality. A reduced length of stay with Hartmann procedure compared with primary resection with anastomosis was reported in the short term, and in the long term, more definite stoma along with poorer quality of life was reported with Hartmann procedure. No high-quality data were found to support the laparoscopic approach., Limitations: Trials specifically assessing Hinchey IV diverticulitis have not yet been completed., Conclusions: High-quality studies showed that laparoscopic peritoneal lavage was associated with an increased morbidity and that Hartmann procedure was associated with poorer long-term outcomes than primary resection with anastomosis with ileostomy, but Hartmann procedure is still acceptable, especially in high-risk patients.
- Published
- 2020
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49. "They say we have a choice, but we don't": A gendered reflection on work-family strategies and planning systems of atypical schedules within male-dominated occupations in Canada and Switzerland.
- Author
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Lefrançois M and Probst I
- Subjects
- Adult, Canada, Ergonomics, Female, Humans, Job Description, Male, Occupations, Switzerland, Time Factors, Family Relations, Occupational Health statistics & numerical data, Work Capacity Evaluation, Work Schedule Tolerance psychology
- Abstract
For parents working in the transportation industry, atypical schedules are often a daily puzzle. Schedule planning systems allowing workers to choose shifts may affect job strenuousness and work-family balance (WFB) for both female and male workers. How could ergonomic interventions related to the implementation of those systems better consider gender dynamics regarding WFB strategies, and minimize inequities among workers? This article presents a joint analysis of two independent case studies related to ergonomic interventions in transport companies in Canada and Switzerland. Direct observation and semi-structured interviews shed light on the characteristics of schedule planning systems and their interaction with men's and women's WFB strategies. Issues related to each step of the planning process (shift construction, schedule choice, day-to-day schedule management) are discussed to inform interventions aimed at facilitating WFB, and ultimately gender equity, in atypical schedule contexts., (Copyright © 2019 Elsevier Ltd. All rights reserved.)
- Published
- 2020
- Full Text
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50. Impacts of considering sex and gender during intervention studies in occupational health: Researchers' perspectives.
- Author
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Laberge M, Blanchette-Luong V, Blanchard A, Sultan-Taïeb H, Riel J, Lederer V, Saint-Charles J, Chatigny C, Lefrançois M, Webb J, Major MÈ, Vaillancourt C, and Messing K
- Subjects
- Adult, Female, Humans, Interviews as Topic, Male, Sex Factors, Ergonomics, Occupational Health, Research Design, Research Personnel, Translational Research, Biomedical
- Abstract
The aim of this article is to examine the impacts of incorporating sex and gender (s/g) analysis in integrated knowledge translation (iKT) initiatives in the field of ergonomics and occupational health. The article presents findings based on a retrospective analysis of twelve intervention-research (IR) studies, including a thematic content analysis of in-depth interviews conducted with 15 researchers involved in these IRs. The findings offer an overview of various categories of impacts, such as changes in partners' views, in workplace settings and conditions, in practices and policies, and in economic outcomes. In these types of IR, health effects measurement is not the main objective, and direct health outcomes are difficult to assess. Explicitly talking about sex/gender led more often to system-level changes but less often to workplace-level changes, compared to interventions where sex/gender was not identified as a specific object of the intervention., (Crown Copyright © 2019. Published by Elsevier Ltd. All rights reserved.)
- Published
- 2020
- Full Text
- View/download PDF
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