Jean Izoulet (1854-1929) : entre religion etsociologie

Hervé Terral 고려대학교 응용문화연구소 2016 에피스테메 Vol.0 No.15

Even if a public garden in Moissac (France, Tarn-et-Garonne) bears today the name of Jean Izoulet (between the winding streets and the flood of 1930) is little known. Nevertheless Jean Izoulet born in the Quercy area held significant positions in the French intellectual world, since for more than thirty years he held the Distinguished Chair of social philosophy in the Collège de France. Born in Miramont in 1854 he died in Paris in 1929, he was deeply attached to the Tarn-et-Garonne department, in particular with the theme of decentralization. But he was particularly known for his thesis, The Modern City (1895), a global reflection on the evolution of society which earned him the esteem of many Republican secretaries of State (Léon Bourgeois quite particularly). Then in the 1920s he became known thanks to a highly critical reflection on the Western world, that of the "democracies" that he felt were deeply threatened. Without wishing to rehabilitate a complex and sometimes debatable way of thinking, we can nevertheless wish to make it known and give it its real place in the general movement of ideas (from the 1880s to the 1930s, characterized by many changes and many dangers). Même si un square de Moissac (82) porte aujourd’hui son nom, Jean Izoulet demeure méconnu. Pourtant ce quercynois de naissance a occupé des fonctions importantes dans le monde intellectuel français, puisqu’il fut pendant plus de trente ans titulaire de la chaire de philosophie sociale au Collège de France. Né à Miramont en 1854, décédé à Paris en 1929, il a toujours montré un vif attachement pour le Tarn-et-Garonne, notamment par le thème de la décentralisation. Il s’est surtout fait connaître par sa thèse La Cité moderne (1895), réflexion d’ensemble sur l’évolution de la société qui lui valut l’estime de bien des ministres républicains (Léon Bourgeois tout particulièrement), puis dans les années 1920 par une réflexion très critique sur le monde occidental, celui des « démocraties » qu’il sentait profondément menacé. Sans vouloir réhabiliter une pensée complexe et parfois discutable, on peut souhaiter néanmoins la faire connaître et lui restituer sa véritable place dans le mouvement général des idées (des années 1880 aux années 1930, grosses de bien des mutations et de bien des dangers).

Symmetries of partial differential equations

Herv\'e Gaussier,Jo\ 대한수학회 2003 대한수학회지 Vol.40 No.3

We establish a link between the study of completely integrablesystems of partial differential equations and the study of genericsubmanifolds in C^n. Using the recent developments ofCauchy-Riemann geometry we provide the set of symmetries of such asystem with a Lie group structure. Finally we determine theprecise upper bound of the dimension of this Lie group for somespecific systems of partial differential equations.

Influence of the non-linearity of the aerodynamic coefficients on the skewness of the buffeting drag force

Hervé Degée,Vincent Denoël 한국풍공학회 2006 Wind and Structures, An International Journal (WAS Vol.9 No.6

This paper is devoted to the non linear quasi-steady aerodynamic loading. A linear approximation is often used to compute the response of structures to buffeting forces. Some researchers have however shown that it is possible to account for the non linearity of this loading. This non linearity can come (i) from the squared velocity or (ii) from the shape of the aerodynamic coefficients (as functions of the wind angle of attack). In this paper, it is shown that this second origin can have significant implications on the design of the structure, particularly when the non linearity of the aerodynamic coefficient is important or when the transverse turbulence is important.

Evaluation of the relationship between lactacidemia and postoperative complications after surgery for peritoneal carcinomatosis

Hervás Marta Soriano,Játiva-Porcar Rosa,Robles-Hernández Daniel,Rubert Anna Serra,Segarra Blanca,Oliva Cristina,Escrig Javier,Llueca José Antonio 대한마취통증의학회 2021 Korean Journal of Anesthesiology Vol.74 No.1

BackgroundCytoreductive surgery was developed as a treatment for peritoneal carcinomatosis. However, this surgery is associated with important complications. The present study aimed to assess the relationship between lactacidemia and the rate of associated complications during the immediate postoperative period in the intensive care unit (ICU) in patients undergoing cytoreductive surgery.MethodsThis was a retrospective observational study. A total of 57 patients underwent cytoreductive surgery. All patients were admitted to the ICU immediately after the surgery. Data on lactic acid levels at the time of admission and discharge from the ICU were collected. Postsurgical complications that occurred during the ICU stay were recorded according to failure-to-rescue analysis and their severity stratified according to the Clavien-Dindo classification.ResultsThe lactic acid levels at admission to the ICU were significantly higher in patients who developed complications, with an almost tripled unadjusted relative risk (2.9, 95% CI: 1.6, 5.3), than in those who did not develop complications for the lactacidemia threshold established in the cumulative sum curve graphs. After adjustment for confounding effects, the relative risk became even higher (3.1, 95% CI: 1.8, 3.6). Lactic acid levels were still significantly higher in this group at the time of discharge from the ICU.ConclusionsSerum lactate level is a risk factor for postoperative complications in patients undergoing cytoreductive surgery for peritoneal carcinomatosis. This study suggests that the risk of developing severe complications almost triples with a lactic acid level of 2.5 mmol/L or higher at the time of admission in the ICU.

Three Solutions to a Simple Commons Problem

Hervé,Moulin 서울대학교 경제연구소 2001 Seoul journal of economics Vol.14 No.3

We compare the equity and incentive properties of three efficient solutions to a simple problem of cooperative production with binary demands for a homogeneous service, when marginal cost is either monotonically increasing or monotonically decreasing. The solutions are the familiar competitive equilibrium with equal incomes, the Shapley value of the stand alone cooperative game, and the virtual price solution, applying the egalitarian equivalence idea to this particular model.

Improved Networked Iterative learning Fault-tolerant Control Algorithm for Systems with Time-delays, Random Packet Losses, Limited Communication and Actuator Failure

Samba Aimé Hervé,Yeremou Tamtsia Aurelien,Nneme Nneme Leandre,Idellette Judith Hermine Som 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.7

This paper is devoted to develop an improved networked iterative learning fault-tolerant control (NILFTC) algorithm for a class of systems with time-delays, random sensor-controller-channels packet losses, limited communication, external disturbances and random actuator failure. Firstly, the state variable, the Markov chain process of random packet losses, network communication delay, limited communication and actuator failure are introduced to establish an extended state-space model of the system. Secondly, based on the dynamics model of the system and combination of stability theory for linear repetitive processes and linear matrix inequality (LMI) technique, robust monotonic trial to trial convergence for NILFTC is specified in terms of LMIs and satisfy H∞ performance. Thirdly MATLAB optimization based on Yet Another LMI Parser (YALMIP) is applied to improve the performance of the NILFTC scheme, in which the convergence of system output tracking error is converted to a convex optimization problem and the constraints are convex, and the optimal iterative learning gain of the NILFTC is determined by solving the optimization problem. Finally, the feasibility and effectiveness of the proposed design method is illustrated on a dynamic hydro-turbine governing system model based on Matlab/Simulink and TrueTime toolbox.

Effects of subacute oral administration of aqueous extract of Macaranga barteri Müll.Arg (Euphorbiaceae) leaf on anthropometric and haematological parameters in rats

Ehilé Ehilé Hervé,Goze Nomane Bernard,Kouakou Kouakou Léandre,Yapo Angoué Paul,Ehilé Ehouan Etienne 한국독성학회 2021 Toxicological Research Vol.37 No.1

Macaranga barteri is a plant used in traditional medicine to treat many illnesses. Previous studies showed the efficacy of the aqueous extract of leaf of this plant (AEMb) in the treatment of gastric ulcer within the dose range of 125–500 mg/kg body weight (b.w.). This study aims at evaluating the safety of AEMb on anthropometric and haematological parameters in wistar rats. Seventy rats were divided into seven groups of ten rats each, including five males and five females. The control group was repeatedly administered by gavage with distilled water at 1 ml/100 g for 28 days while test groups 2, 3, 4 and 5, were repeatedly gavaged with AEMb at the doses of 125, 250, 500 and 1000 mg/kg b.w. respectively. As for satellites (groups 6 and 7), they received daily and respectively distilled water at 1 ml/100 g b.w. and AEMb at the dose of 1000 mg/ kg b.w. The results showed that AEMb caused no significant changes in the behaviour of rats and the weight of the organs removed (kidneys, liver, spleen, and heart) and their relative weights at the end of the 28 days of treatment. However, the body weight and the amount of food consumed by animals treated with AEMb at the doses of 250, 500 and 1000 mg/kg b.w. increased significantly (p < 0.05) from the third week compared to control group. Haematological analysis revealed a non-significant increase (p > 0.05) in leukocyte lineage and platelet level in female rats at the studied doses. However, a significant (p < 0.05) increase in platelet level was recorded in male rats at 1000 mg/kg b.w. A significant (p < 0.05) increase in erythrocyte and hemoglobin levels at the doses of 250, 500 and 1000 mg/kg b.w. in treated animals was also revealed. In conclusion, repeated administration of AEMb over 28 days to rats was safe on leucocyte lineage and most of erythrocyte indices at doses ranging from 125 to 1000 mg/kg b.w. Nevertheless, the use of this extract caused a transient increase of erythrocyte, hemoglobin and platelet levels 2 weeks after the end of AEMb administration, but these effects disappeared. So, the subacute oral administration of AEMb revealed few potential toxic effects overall.

바쟁 무브

에르베 주베르- 로랑생(Hervé Joubert-Laurencin ) 동의대학교 영화·트랜스미디어연구소 2019 디스포지티프 Vol.6 No.-

Linear Viscoelastic Behaviour of Geogrids Interface within Bituminous Mixtures

Reuber Freire,Hervé Di Benedetto,Cédric Sauzéat,Simon Pouget,Didier Lesueur 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.6

Recently, the use of geogrids as bituminous pavements reinforcement has increased in pavements construction and rehabilitation,mainly to avoid reflective cracking. One major research topic is to characterize the mechanical behaviour of actual reinforcedpavement structures, from laboratory experimentation and take it into account for the design. This paper aims at presenting amethodology for the determination of the Interface Linear Viscoelastic (LVE) behaviour of specimens reinforced with geogrids. Thismethod is based on a tension-compression test on cylindrical sample, classically used for complex modulus tests. A geogrid producedby Texinov was glued with tack coat, which constitute the studied interface. This geogrid is composed by fiberglass filaments andpolyester veil, both coated with emulsion. Axial cyclic tests at controlled strain mode of loading (tension-compression) wereperformed on the same bituminous mixtures samples with and without geogrid. The experimental data was fitted using the 2 Springs,2 Parabolic Elements and 1 Dashpot (2S2P1D) model both for the mixtures and for the interface. The results indicate that theproposed methodology can successfully provide the interface LVE behaviour.

Histological Method to Study the Effect of Shear Stress on Cell Proliferation and Tissue Morphology in a Bioreactor

Morgan Chabanon,Hervé Duval,Jérôme Grenier,Claire Beauchesne,Benoit Goyeau,Bertrand David 한국조직공학과 재생의학회 2019 조직공학과 재생의학 Vol.16 No.3

BACKGROUND: Tissue engineering represents a promising approach for the production of bone substitutes. The use of perfusion bioreactors for the culture of bone-forming cells on a three-dimensional porous scaffold resolves mass transport limitations and provides mechanical stimuli. Despite the recent and important development of bioreactors for tissue engineering, the underlying mechanisms leading to the production of bone substitutes remain poorly understood. METHODS: In order to study cell proliferation in a perfusion bioreactor, we propose a simplified experimental set-up using an impermeable scaffold model made of 2 mm diameter glass beads on which mechanosensitive cells, NIH-3T3 fibroblasts are cultured for up to 3 weeks under 10 mL/min culture medium flow. A methodology combining histological procedure, image analysis and analytical calculations allows the description and quantification of cell proliferation and tissue production in relation to the mean wall shear stress within the bioreactor. RESULTS: Results show a massive expansion of the cell phase after 3 weeks in bioreactor compared to static control. A scenario of cell proliferation within the three-dimensional bioreactor porosity over the 3 weeks of culture is proposed pointing out the essential role of the contact points between adjacent beads. Calculations indicate that the mean wall shear stress experienced by the cells changes with culture time, from about 50 mPa at the beginning of the experiment to about 100 mPa after 3 weeks. CONCLUSION: We anticipate that our results will help the development and calibration of predictive models, which rely on estimates and morphological description of cell proliferation under shear stress.