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Volumetric Vector-Based Representation for Indirect Illumination Caching

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Journal of Computer Science & Technology 2010年第5期25卷 925-932页

作者： romain Pacanowski Xavier Granier Christophe Schlick Pierre Poulin CEA-CESTA BP2 Le Barp33114France ACM INRIA Bordeaux Sud-Ouest/LaBRI-Bordeaux University Talence33405France State Key Lab of CAD&CG Zhejiang University LIGUM Dept.I.R.O.Universite de MontrealMontreal QCH3C 3J7Canada

This paper introduces a caching technique based on a volumetric representation that captures low-frequency indirect *** structure is intended for efficient storage and manipulation of *** is based on a 3D grid that stores a fixed set of irradiance *** preprocessing,this representation can be built using almost any existing global illumination *** rendering,the indirect illumination within a voxel is interpolated from its associated irradiance vectors,and is used as additional local light *** with other techniques,the 3D vector-based representation of our technique offers increased robustness against local geometric variations of a *** thus demonstrate that it may be employed as an efficient and high-quality caching data structure for bidirectional rendering techniques such as particle tracing or photon mapping.

关键词： caching for global illumination photon mapping particle tracing

Hybrid Cellular Automaton-Parabolic Thick Needle model for equiaxed dendritic solidification

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Journal of Materials Science & Technology 2022年第29期124卷 26-40页

作者： romain Fleurisson Oriane Senninger Gildas Guillemot Charles-André Gandin MINES ParisTech PSL Research UniversityCEMEF UMR CNRS 7635CS1020706904 Sophia AntipolisFrance

A hybrid Cellular Automaton(CA)-Parabolic Thick Needle(PTN)model is developed for the simulation of an equiaxed dendritic *** is implemented by solving conservation equations with the Finite Element(FE)method at two *** the scale of the microstructure,dendritic branches are approximated by a network of *** solute field is computed in the liquid using a FE mesh with minimum size smaller than the diffusion length ahead of the dendrite tips,giving access to a detailed description of each dendrite tip growth velocity as well as solutal interactions between *** the simulation domain scale,volume averaged heat and solute transfers are solved on a coarser FE *** average volumetric fraction of phases is deduced from a field giving the fraction of dendritic microstructure together with a microsegregation *** the PTN themselves grow on CA cells,the dendrite tip growth velocity is transferred to the vertices of the polygon associated to the CA growth ***,the field giving the fraction of dendritic microstructure is deduced from the fraction of CA cells part of the mushy zone,which include cells containing PTN *** of the new multiple scale CAPTN model include solutal interaction between dendrite branches together with long range transfer of heat and solute mass,together with the role of latent heat release on equiaxed solidification.

关键词： Solidification Dendrite growth law Multiscale Finite element method

Impacts of a Japan–South Korea power system interconnection on the competitiveness of electric power companies according to power exchange prices

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Global Energy Interconnection 2020年第3期3卷 292-302页

作者： romain Zissler Jeffrey S.Cross School of Environment and Society Tokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo 152-8550Japan

In many regions,international power system interconnections provide economic,energy-security,environmental,and technical *** contrast,such interconnections remain scarce in Northeast *** 2016,after approving a joint memorandum of understanding between major electric power companies from China,Japan,South Korea,and Russia,related initiatives regained momentum in the ***,the corresponding developments in Japan remain limited,mainly owing to the lack of involvement of Japanese electric power *** study represents a pioneering attempt to provide an economic assessment based on power exchange prices of a power system interconnection between Japan and South Korea regarding the competitiveness of electric power companies in terms of competitive business segments and strategic *** found that although the position of Japanese generators may slightly deteriorate,that of the supply segment would substantially improve,thus suggesting that more opportunities than threats are derived from the *** promising outcome may foster the adoption of an interconnection with South Korea considering the positive economic and business perspectives in ***,realizing the interconnection may improve the energy security and air quality in the region.

关键词： Electricity grid interconnection Japan South Korea Electric power company Power exchange price

Compression-induced stiffness in the buckling of a one fiber composite

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Theoretical & Applied Mechanics Letters 2013年第6期3卷 6-10页

作者： romain Lagrange Massachusetts Institute of Technology Department of Applied Mathematics

We study the buckling of a one fiber composite whose matrix stiffness is slightly dependent on the compressive force. We show that the equilibrium curves of the system exhibit a limit load when the induced stiffness parameter gets bigger than a threshold. This limit load increases when the stiffness parameter is increasing and it is related to a possible localized path in the post-buckling domain. Such a change in the maximum load may be very desirable from a structural stand point.

关键词： buckling fiber composite initial curvature compression-induced stiffness limit point

Migration of a vascular coil from the common bile duct secondary to vasculobiliary injury after cholecystectomy

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Hepatobiliary Surgery and Nutrition 2019年第6期8卷 679-680页

作者： Abdelkader Taibi romain Legros Visceral Surgery Department Dupuytren University HospitalLimogesFrance University Limoges CNRSXLIMUMR 7252LimogesFrance Gastroenterology Department Dupuytren University HospitalLimogesFrance

A 61-year-old woman had cholangitis secondary to two cholelithiases[one in the common bile duct(CBD)and one in the cystic duct(Mirizzi syndrome)],which was treated by *** patient subsequently underwent a shincterotomy with endoscopic retrograde cholangiopancreatography(ERCP)and,finally,a cholecystectomy by *** postoperative course was marked by biliary *** was transferred to our hospital due to haemorrhagic shock and abdominal pain.

关键词： biliary bile cholecystectomy

Germinal center-dependent and-independent immune responses of tumor-infiltrating B cells in human cancers

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Cellular & Molecular Immunology 2023年第9期20卷 1040-1050页

作者： Eve Playoust romain Remark Eric Vivier Pierre Milpied Marseille Université CNRSINSERMCentre d’Immunologie de Marseille-LuminyMarseilleFrance Innate Pharma MarseilleFrance

B cells play essential roles in immunity,mainly through the production of high affinity plasma cells(PCs)and memory B(Bmem)*** affinity maturation and differentiation of B cells rely on the integration of B-cell receptor(BCR)intrinsic and extrinsic signals provided by antigen binding and the microenvironment,*** recent years,tumor infiltrating B(TIL-B)cells and PCs(TIL-PCs)have been revealed as important players in antitumor responses in human cancers,but their interplay and dynamics remain largely *** lymphoid organs,B-cell responses involve both germinal center(GC)-dependent and GC-independent pathways for Bmem cell and PC *** maturation of BCR repertoires occurs in GC reactions with specific spatiotemporal dynamics of signal integration by B *** general,the reactivation of high-affinity Bmem cells by antigens triggers GC-independent production of large numbers of PC without BCR *** B-cell dynamics in immune responses requires the integration of multiple tools and readouts such as single-cell phenotyping and RNA-seq,in situ analyses,BCR repertoire analysis,BCR specificity and affinity assays,and functional ***,we review how those tools have recently been applied to study TIL-B cells and TIL-PC in different types of solid *** assessed the published evidence for different models of TIL-B-cell dynamics involving GC-dependent or GC-independent local responses and the resulting production of antigen-specific ***,we highlight the need for more integrative B-cell immunology studies to rationally investigate TIL-B cells as a leverage for antitumor therapies.

关键词： antibody tertiary lymphoid structure plasma cell germinal center cancer

Dimensions of hepatocellular carcinoma phenotypic diversity

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World Journal of Gastroenterology 2018年第40期24卷 4536-4547页

作者： romain Désert Natalia Nieto Orlando Musso Institut NuMeCan Université de Rennes 1 Institut national de la recherche agronomique (INRA) Institut national de la santé et de la recherche médicale (INSERM) Department of Pathology Department of Medicine (Gastroenterology and Hepatology) University of Illinois at Chicago

Hepatocellular carcinoma(HCC) is the 3^(rd) leading cause of cancer-related death worldwide. More than 80% of HCCs arise within chronic liver disease resulting from viral hepatitis, alcohol, hemochromatosis, obesity and metabolic syndrome or genotoxins. Projections based on Western lifestyle and its metabolic consequences anticipate a further increase in incidence, despite recent breakthroughs in the management of viral hepatitis. HCCs display high heterogeneity of molecular phenotypes, which challenges clinical management. However, emerging molecular classifications of HCCs have not yet formed a unified corpus translatable to the clinical practice. Thus, patient management is currently based upon tumor number, size, vascular invasion, performance status and functional liver reserve. Nonetheless, an impressive body of molecular evidence emerged within the last 20 years and is becoming increasingly available to medical practitioners and researchers in the form of repositories. Therefore, the aim this work is to review molecular data underlying HCC classifications and to organize this corpus into the major dimensions explaining HCC phenotypic diversity. Major efforts have been recently made worldwide toward a unifying "clinically-friendly" molecular landscape. As a result, a consensus emerges on three major dimensions explaining the HCC heterogeneity. In the first dimension, tumor cell proliferation and differentiation enabled allocation of HCCs to two major classes presenting profoundly different clinical aggressiveness. In the second dimension, HCC microenvironment and tumor immunity underlie recent therapeutic breakthroughs prolonging patients' survival. In the third dimension,metabolic reprogramming, with the recent emergence of subclass-specific metabolic profiles, may lead to adaptive and combined therapeutic approaches. Therefore, here we review recent molecular evidence, their impact on tumor histopathological features and clinical behavior and highlight the r

关键词： Liver metabolism Liver zonation Hepatocellular carcinoma classification Wnt/β-catenin TP53 Tumor microenvironment Inflammation Tumor immunity Hepatocyte proliferation Hepatocyte differentiation

Mechanisms of electrochemical magnesium(de)alloying of Mg-Sn and Mg-Pb polymorphs

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Journal of Magnesium and Alloys 2022年第6期10卷 1609-1616页

作者： Clément Pechberty Antoine Klein Bernard Fraisse Lorenzo Stievano romain Berthelot ICGM CNRSUniv.MontpellierENSCMMontpellierFrance RS2E CNRSHub de l’EnergieAmiensFrance

Different polymorphs of Mg-Sn and Mg-Pb intermetallic compounds were prepared by high-energy mechanical alloying and then investigated as active material in magnesium batteries. Beside thermodynamically stable Mg_(2)Sn and Mg_(2)Pb crystallizing in the anti-fluorite structure, other polymorphs Mg_(~2)Sn and Mg_(~2)Pb were prepared by increasing the ball-milling time. The first dealloying process is almost complete only for the cubic polymorphs, then similar capacities are observed during the subsequent alloying and dealloying *** to operando X-ray diffraction, the electrochemical mechanism is revealed and shows that the cubic polymorphs Mg_(2)Sn and Mg_(2)Pb tend to preferentially form during the alloying whatever the pristine intermetallic. Weak traces of Mg_(~2)Sn and Mg_(~2)Pb are observed during the alloying, suggesting that these polymorphs act as a by-product and/or an intermediate phases of the electrochemical process. Finally, the compatibility of cubic Mg_(2)Sn and Mg_(2)Pb with Mg(TFSI)_(2)-based electrolyte is confirmed in full cell vs. a positive electrode based on the Chevrel phase Mo6S8, although limited performance is achieved. This fundamental work provides new insights in the behavior of alloy-type negative electrodes for magnesium-ion batteries.

关键词： Magnesium batteries Alloy electrode Mechanochemistry Operando X-ray diffraction

Renewable energy in Benin: current situation and future prospects

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Clean Energy 2023年第5期7卷 952-961页

作者： romain Akpahou Lena D.Mensah David A.Quansah Department of Mechanical Engineering Kwame Nkrumah University of Science and Technology(KNUST)KumasiGhana The Brew-Hammond Energy Centre Kwame Nkrumah University of Science and Technology(KNUST)KumasiGhana

To provide clean energy at a lower cost to their citizens,all nations of the world are striving to increase their energy production in an environmentally friendly *** has also joined this dynamic by considerably increasing its green energy production efforts in recent *** country has a huge undeveloped renewable-energy(RE)potential that can contribute considerably to its national energy production *** paper summarizes the current RE situation in Benin and examines its future *** current energy situation of the country is discussed,followed by an examination of its electricity demand-and-supply *** country has been found to depend heavily on natural gas and petroleum products from neighbouring countries and has~41%of national electricity ***,the government is taking considerable steps to implement RE projects in the *** study analyzes government targets in the energy sector with existing policies and institutional *** are made for the benefit of the government,the private sector and other actors in order to developing the RE potential of Benin.

关键词： Benin electricity demand energy policy future prospect renewable energy