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Search Results: 1 - 10 of 462078 matches for " A. Barbier "
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Animation culturelle et Volontariat International : une expérience à l’Institut Fran ais de Valence
Julien Barbier
Synergies Espagne , 2012,
Abstract: L’Institut fran ais de Valence est le premier acteur de la promotion et de la diffusion de la culture et de la langue fran aise dans la région du Levant. Fruit d’un travail acharné réalisé par une petite équipe de passionnés, l’établissement jouit actuellement d’une excellente réputation dans le réseau culturel fran ais à l’étranger et au sein des cercles culturels locaux. Ce cadre exceptionnel rend toute expérience menée au service de l’action culturelle francophone particulièrement enrichissante et déterminante.
Macro‐ecology of the world’s savannas
Nicolas Barbier
Frontiers of Biogeography , 2011,
Abstract:
Le roi et les cités. Pouvoir royal, pouvoirs locaux et société au nord de la Loire (VIe-VIIIe siècle)
Josiane Barbier
Bulletin du Centre d’études Médiévales d’Auxerre , 2005, DOI: 10.4000/cem.740
Abstract: Le projet de recherche “Le roi et les cités. Pouvoir central, pouvoirs locaux et société au nord de la Loire, VIe-VIIIe siècle” vise à cerner la manière concrète dont le pouvoir royal s’exer a sous les Mérovingiens et sous les premiers Carolingiens dans ses interactions avec les pouvoirs locaux. Il s’agit de mieux percevoir le poids respectif du roi et des élites des cités et pagi dans le gouvernement et dans l’encadrement des populations, en conciliant perspectives politiques et interprétati...
New Set of Codes for the Maximum-Likelihood Decoding Problem
Morgan Barbier
Mathematics , 2010,
Abstract: The maximum-likelihood decoding problem is known to be NP-hard for general linear and Reed-Solomon codes. In this paper, we introduce the notion of A-covered codes, that is, codes that can be decoded through a polynomial time algorithm A whose decoding bound is beyond the covering radius. For these codes, we show that the maximum-likelihood decoding problem is reachable in polynomial time in the code parameters. Focusing on bi- nary BCH codes, we were able to find several examples of A-covered codes, including two codes for which the maximum-likelihood decoding problem can be solved in quasi-quadratic time.
Re-encoding reformulation and application to Welch-Berlekamp algorithm
Morgan Barbier
Mathematics , 2012,
Abstract: The main decoding algorithms for Reed-Solomon codes are based on a bivariate interpolation step, which is expensive in time complexity. Lot of interpolation methods were proposed in order to decrease the complexity of this procedure, but they stay still expensive. Then Koetter, Ma and Vardy proposed in 2010 a technique, called re-encoding, which allows to reduce the practical running time. However, this trick is only devoted for the Koetter interpolation algorithm. We propose a reformulation of the re-encoding for any interpolation methods. The assumption for this reformulation permits only to apply it to the Welch-Berlekamp algorithm.
Statistical physics and approximate message-passing algorithms for sparse linear estimation problems in signal processing and coding theory
Jean Barbier
Mathematics , 2015,
Abstract: This thesis is interested in the application of statistical physics methods and inference to sparse linear estimation problems. The main tools are the graphical models and approximate message-passing algorithm together with the cavity method. We will also use the replica method of statistical physics of disordered systems which allows to associate to the studied problems a cost function referred as the potential of free entropy in physics. It allows to predict the different phases of typical complexity of the problem as a function of external parameters such as the noise level or the number of measurements one has about the signal: the inference can be typically easy, hard or impossible. We will see that the hard phase corresponds to a regime of coexistence of the actual solution together with another unwanted solution of the message passing equations. In this phase, it represents a metastable state which is not the true equilibrium solution. This phenomenon can be linked to supercooled water blocked in the liquid state below its freezing critical temperature. We will use a method that allows to overcome the metastability mimicing the strategy adopted by nature itself for supercooled water: the nucleation and spatial coupling. In supercooled water, a weak localized perturbation is enough to create a crystal nucleus that will propagate in all the medium thanks to the physical couplings between closeby atoms. The same process will help the algorithm to find the signal, thanks to the introduction of a nucleus containing local information about the signal. It will then spread as a "reconstruction wave" similar to the crystal in the water. After an introduction to statistical inference and sparse linear estimation, we will introduce the necessary tools. Then we will move to applications of these notions to signal processing and coding theory problems.
Transverse approach between real world concentrations of SO2, NO2, BTEX, aldehyde emissions and corrosion in the Grand Mare tunnel
I Ameur-Bouddabbous,J Kasperek,A Barbier,F Harel,B Hannoyer,
I. Ameur-Bouddabbous
,J. Kasperek,A. Barbier,F. Harel,B. Hannoyer

环境科学学报(英文版) , 2012,
Abstract: With regard to automotive traffic, a tunnel-type semi enclosed atmosphere is characterized by a higher concentration of gaseous pollutants than on urban traffic roads and highlights the gaseous effluent species having an impact on material degradation. Therefore, a transverse approach between air quality and its consequences upon the longevity of materials is necessary, implying better knowledge of tunnel atmosphere and a better understanding of material degradation inside a tunnel for operating administration. Gaseous pollutant measurements carried out in a road tunnel in Rouen (Normandy) give the real world traffic concentrations of experimental exposure conditions. The sampling campaigns, achieved in summer and winter include SO2, NO2, BTEX and aldehyde analyses. Effluent profiles in the upward and downward tubes have been established. The current work shows that SO2, NO2, formaldehyde, acetaldehyde, propanal and butanal must be considered in the degradation process of materials in a stuffy environment. As regards NO2, its concentration depends on the modification of the automotive fleet. The total aldehyde concentrations indicate no particular trend between the two bores. Formaldehyde, acetaldehyde, propanal, butanal and acrolein species are the most abundant species emitted by vehicles and represent 90% to 95% of the total aldehyde emissions.
Liver Resection after Downstaging Hepatocellular Carcinoma with Sorafenib
L. Barbier,F. Muscari,S. Le Guellec,A. Pariente,P. Otal,B. Suc
International Journal of Hepatology , 2011, DOI: 10.4061/2011/791013
Abstract: Background. Sorafenib is a molecular-targeted therapy used in palliative treatment of advanced hepatocellular carcinoma in Child A patients. Aims. To address the question of sorafenib as neoadjuvant treatment. Methods. We describe the cases of 2 patients who had surgery after sorafenib. Results. The patients had a large hepatocellular carcinoma in the right liver with venous neoplastic thrombi (1 in the right portal branch, 1 in the right hepatic vein). After 9 months of sorafenib, reassessment showed that tumours had decreased in size with a necrotic component. A right hepatectomy with thrombectomy was performed, and histopathology showed 35% to 60% necrosis. One patient had a recurrence after 6 months and had another liver resection; they are both recurrence-free since then. Conclusion. Sorafenib can downstage hepatocellular carcinoma and thus could represent a bridge to surgery. It may be possible to select patients in good general condition with partial regression of the tumour with sorafenib for a treatment in a curative intent.
Liver Resection after Downstaging Hepatocellular Carcinoma with Sorafenib
L. Barbier,F. Muscari,S. Le Guellec,A. Pariente,P. Otal,B. Suc
International Journal of Hepatology , 2011, DOI: 10.4061/2011/791013
Abstract: Background. Sorafenib is a molecular-targeted therapy used in palliative treatment of advanced hepatocellular carcinoma in Child A patients. Aims. To address the question of sorafenib as neoadjuvant treatment. Methods. We describe the cases of 2 patients who had surgery after sorafenib. Results. The patients had a large hepatocellular carcinoma in the right liver with venous neoplastic thrombi (1 in the right portal branch, 1 in the right hepatic vein). After 9 months of sorafenib, reassessment showed that tumours had decreased in size with a necrotic component. A right hepatectomy with thrombectomy was performed, and histopathology showed 35% to 60% necrosis. One patient had a recurrence after 6 months and had another liver resection; they are both recurrence-free since then. Conclusion. Sorafenib can downstage hepatocellular carcinoma and thus could represent a bridge to surgery. It may be possible to select patients in good general condition with partial regression of the tumour with sorafenib for a treatment in a curative intent. 1. Introduction Hepatocellular carcinoma (HCC) represents one of the highest causes of cancer-related death. Recent advances have been made for advanced HCC (extrahepatic spread or major vascular invasion) with molecular-targeted therapies [1] such as sorafenib (Nexavar, Bayer), which has been indicated as a palliative therapy in Child A patients since a benefit in median survival and time to radiologic progression has been shown in 2 large international trials [1, 2]. We report here the cases of 2 patients who were treated with sorafenib with a palliative intent but eventually had a resection after good clinical and radiological response. This is, to our knowledge, the first report of resection surgery after sorafenib. 2. Case Reports 2.1. Case 1 A 56-year-old man presented with asthenia, right subscapular pain, weight loss, and malaise with hypoglycaemia. He had a significant history of chronic alcoholism. The laboratory tests showed normal platelet count, polycythaemia, prothrombin time of 79%, liver cytolysis, and cholestasis with total bilirubin of 43?μmol/L. Alpha-foeto-protein (AFP) was 282,500?ng/mL, and anti-HCV antibodies were positive with high virus levels. MRI (Magnetic Resonance Imaging) showed (Figure 1(a)) a 120?mm hypervascular tumour of the right liver with a right portal branch tumoral thrombosis reaching the bifurcation. There was no sign of extra-abdominal spread. The lesion had all radiological features of HCC (i.e., hypervascular with portal phase washout). The middle hepatic vein was free of
Structure of self-organized Fe clusters grown on Au(111) analyzed by Grazing Incidence X-Ray Diffraction
H. Bulou,F. Scheurer,P. Ohresser,A. Barbier,S. Stanescu,C. Quiros
Physics , 2003, DOI: 10.1103/PhysRevB.69.155413
Abstract: We report a detailed investigation of the first stages of the growth of self-organized Fe clusters on the reconstructed Au(111) surface by grazing incidence X-ray diffraction. Below one monolayer coverage, the Fe clusters are in "local epitaxy" whereas the subsequent layers adopt first a strained fcc lattice and then a partly relaxed bcc(110) phase in a Kurdjumov-Sachs epitaxial relationship. The structural evolution is discussed in relation with the magnetic properties of the Fe clusters.
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