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MARIE:One-Stage Object Detection Mechanism for Real-Time Identifying of Firearms

Computer Modeling in Engineering & Sciences 2025年第1期142卷 279-298页

作者： Diana Abi-Nader Hassan Harb Ali Jaber Ali Mansour christophe.Osswald Nour Mostafa Chamseddine Zaki Computer Science Department Faculty of SciencesLebanese UniversityBeirut146404Lebanon College of Engineering and Technology American University of the Middle EastEgaila54200Kuwait Lab-STICC CNRS UMR 6285ENSTA-BretagneBrest29200France

Security and safety remain paramount concerns for both governments and individuals *** today’s context,the frequency of crimes and terrorist attacks is alarmingly increasing,becoming increasingly intolerable to ***,there is a pressing need for swift identification of potential threats to preemptively alert law enforcement and security forces,thereby preventing potential attacks or violent *** advancements in big data analytics and deep learning have significantly enhanced the capabilities of computer vision in object detection,particularly in identifying *** paper introduces a novel automatic firearm detection surveillance system,utilizing a one-stage detection approach named MARIE(Mechanism for Realtime Identification of Firearms).MARIE incorporates the Single Shot Multibox Detector(SSD)model,which has been specifically optimized to balance the speed-accuracy trade-off critical in firearm detection *** SSD model was further refined by integrating MobileNetV2 and InceptionV2 architectures for superior feature extraction *** experimental results demonstrate that this modified SSD configuration provides highly satisfactory performance,surpassing existing methods trained on the same dataset in terms of the critical speedaccuracy *** these innovations,MARIE sets a new standard in surveillance technology,offering a robust solution to enhance public safety effectively.

关键词： Firearm and gun detection single shot multi-box detector deep learning one-stage detector MobileNet inception convolutional neural network

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Articulated Estimator Random Field and Geometrical Approach Applied in System Identification

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Journal of Systems Science & Complexity 2018年第5期31卷 1164-1185页

作者： CORBIER christophe Lyon University St-Etienne Jean Monnet University Roanne Technology University Institute

A new point of view of robust statistics based on a geometrical approach is tackled in this paper. Estimation procedures are carried out from a new robust cost function based on a chaining of elementary convex norms. This chain is randomly articulated in order to treat more efficiently natural outliers in data-set. Estimated parameters are considered as random fields and each of them, named articulated estimator random field （AERF） is a manifold or stratum of a stratified space with Riemannian geometry properties, From a high level excursion set, a probability distribution model Mata is presented and a system model validation geometric criterion （SYMOVAGEC） for system model structures Msys based on Rieeian scalar curvatures is proposed. Numerical results are drawn in a context of system identification.

关键词： Articulated robust estimation estimators random field information geometry stratifiedspace system identification.

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Toward the identi?cation and role of structural variations during dog domestication

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National Science Review 2019年第1期6卷 123-124页

作者： christophe.Hitte University of Rennes

To date, we know little about the genetic diversity and development mechanisms that, through the process of domestication, have made the modern dog emerge. Following the processes of domestication and a phase of intense artificial selection,dogs became our auxiliaries for hunting, guarding and finally our best friends. The range of phenotypic diversity in dogs today greatly exceeds that of its ancestors, the wolves, making dogs the most morphologically diverse species of terrestrial mammals[1]. To advance these domestication research questions, studies are now focusing on differences in the content, organization and structure of the genome, called structural variations (SV),as a major source of genetic and phenotypic diversity. In addi-

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Late Quaternary clay minerals off Middle Vietnam in the western South China Sea: Implications for source analysis and East Asian monsoon evolution

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Science China Earth Sciences 2007年第11期50卷 1674-1684页

作者： christophe.COLIN Laboratoire IDES UMR 8148 CNRS Université de Paris XI Orsay 91405 France

High-resolution clay mineral records combined with oxygen isotopic stratigraphy over the past 450 ka during late Quaternary from Core MD05-2901 off Middle Vietnam in the western South China Sea are re-ported to reconstruct a history of East Asian monsoon evolution. Variations in Illite, chlorite, and kaolinite contents indicate a strong glacial-interglacial cyclicity, while changes in smectite content present a higher frequency cyclicity. The provenance analysis indicates a mixture of individual clay minerals from various sources surrounding the South China Sea. Smectite derived mainly from the Sunda shelf and its major source area of the Indonesian islands. Illite and chlorite originated mainly from the Mekong and Red rivers. Kaolinite was provided mainly by the Pearl River. Spectral analysis of the kaolin-ite/(illite+chlorite) ratio displays a strong eccentricity period of 100 ka, implying the ice sheet-forced win-ter monsoon evolution; whereas higher frequency changes in the smectite content show an ice sheet-forced obliquity period of 41 ka, and precession periods of 23 and 19 ka and a semi-precession period of 13 ka as well, implying the tropical-forced summer monsoon evolution. The winter monsoon evolution is generally in coherence with the glacial-interglacial cyclicity, with intensified winter monsoon winds during glacials and weakened winter monsoon winds during interglacials; whereas the summer monsoon evolution provides an almost linear response to the summer insolation of low latitude in the Northern Hemisphere, with strengthened summer monsoon during higher insolation and weakened summer monsoon during lower insolation. The result suggests that the high-latitude ice sheet and low-latitude tropical factor could drive the late Quaternary evolution of East Asian winter and summer monsoons, respectively, implying their diplex and self-contained forcing mechanism.

关键词： clay minerals,provenance,East Asian monsoon,late Quaternary,Middle Vietnam,South China Sea

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Dihydrosphingosine-lnduced Programmed Cell Death in Tobacco BY-2 Cells Is Independent of H2O2 Production

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Molecular Plant 2011年第2期4卷 310-318页

作者： christophe.Lachaud Universite de Toulouse UPS UMR 5546 Surfaces Cellulaires et Signalisation chez les Vegetaux BP 42617 F-31326 Castanet-Tolosan France CNRS UMR 5546 BP 42617 F-31326 Castanet-Tolosan France

Sphinganine or dihydrosphingosine （d18：0, DHS）, one of the most abundant free sphingoid Long Chain Base （LCB） in plants, has been recently shown to induce both cytosolic and nuclear calcium transient increases and a correlated Programmed Cell Death （PCD） in tobacco BY-2 cells. In this study, in order to get deeper insight into the LCB signaling pathway leading to cell death, the putative role of Reactive Oxygen Species （ROS） has been investigated. We show that DHS triggers a rapid dose-dependent production of H2O2 that is blocked by diphenyleniodonium （DPI）, indicating the involvement of NADPH oxidase（s） in the process. In addition, while DPI does not block DHS-induced calcium increases, the ROS production is inhibited by the broad spectrum calcium channel blocker lanthanum （La^3＋）. Therefore, ROS production occurs downstream of DHS-induced Ca^2＋ transients. Interestingly, DHS activates expression of defense-related genes that is inhibited by both La^3＋ and DPI. Since DPI does not prevent DHS-induced cell death, these results strongly indicate that DHS-induced H2O2 production is not implicated in PCD mechanisms but rather would be associated to basal cell defense mechanisms.

关键词： Tobacco BY-2 cells calcium signaling cytosolic calcium aequorin sphingolipids LCBs dihydrosphingosine sphinganine apoptosis Programmed Cell Death (PCD) Reactive Oxygen Species (ROS) H2O2 oxidative burst.

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Needs of thermodynamic properties measurements and modeling in the frame of new regulations on refrigerants

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 724-733页

作者： COQUELET christophe.RICHON Dominique School of Mines of Paris CEP/TEPCNRS FRE 286135rue Saint HonoréFontainebleau 77305France

In 1987, the Montreal Protocol prohibited the worldwide use and production of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) and hydro fluorocarbons (HFCs) were proposed as alternative refrigerants. Unfortunately, HFCs have non negligible global warning potential and therefore new refrigerants must be proposed or old refrigerants must be used associated with HFC. Accurate experimental thermodynamic data and predictive techniques are required for better under-standing of the performance of the newly proposed refrigerants. In this communication, experimental techniques based on either analytic or synthetic methods are first described. Data are reported. Then two newly developed predictive models based on thermodynamic approach with the isofugacity criterion and artificial neural network method are presented. The results can provide better evaluation of refrigerants, especially with the aim of studying global warning effects.

关键词： Refrigerants Experimental apparatus Thermodynamic Modeling Vapor-liquid equilibria (VLE) Phase diagram Density

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Generalized LMMSE Filtering with Out-of-Sequence Observations in Arbitrary Constant Delay

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Chinese Journal of Electronics 2019年第6期28卷 1217-1226页

作者： LEI Ming BAEHR christophe.JING Zhongliang School of Aeronautics and Astronautics Shanghai Jiao Tong University Météo-France National Meteorological Research Centre/CNRS

Focusing on the problem of state estimation in the presence of sensor faults and Out-of-sequence measurement(OOSM) observations synchronously, we derive a formulation of Linear minimum mean squared error(LMMSE) filter with the arbitrary time delay of OOSM, the generalization of the present work lies in simultaneous treatment of correlated faults together with OOSMs that arrive at an arbitrary delay in a linear-optimal manner. The approach is demonstrated in a numerical comparison.

关键词： Out-of-sequence measurement(OOSM) Linear minimum mean squared error(LMMSE) Arbitrary time delay Sensor faults Fault-tolerant estimation Multisensor fusion

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A note on the regularity of the holes for permeability property through a perforated domain for the 2D Euler equations:Dedicated to Professor Jean-Yves Chemin on the Occasion of His 60th Birthday

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Science China Mathematics 2019年第6期62卷 1121-1142页

作者： christophe.Lacave Chao Wang Institut Fourier Université Grenoble AlpesCNRS School of Mathematical Sciences Peking University

For equations of order two with the Dirichlet boundary condition, as the Laplace problem, the Stokes and the Navier-Stokes systems, perforated domains were only studied when the distance between the holes d_ε is equal to or much larger than the size of the holes ε. Such a diluted porous medium is interesting because it contains some cases where we have a non-negligible effect on the solution when(ε, d_ε) →(0, 0).Smaller distances were avoided for mathematical reasons and for these large distances, the geometry of the holes does not affect or rarely affect the asymptotic result. Very recently, it was shown for the 2D-Euler equations that a porous medium is non-negligible only for inter-holes distances much smaller than the sizes of the *** this result, the boundary regularity of holes plays a crucial role, and the permeability criterion depends on the geometry of the lateral boundary. In this paper, we relax slightly the regularity condition, allowing a corner, and we note that a line of irregular obstacles cannot slow down a perfect fluid in any regime such thatε ln d_ε→ 0.

关键词： ideal fluids homogenization in perforated domains shrinking obstacles and the porous medium domains with corners

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Paleoclimate and Paleoenvironment of Gonghe Basin, Qinghai-Tibet Plateau, During the Lastdeglacial: Weathering, Erosion and Vegetation Cover Affect Clay Mineral Formation

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Acta Geologica Sinica(English Edition) 2014年第2期88卷 647-660页

作者： SUN Qingfeng christophe.COLIN Faculty of Geography Northwest Normal University Laboratoire des Interactions et Dynamique des Environnements de Surface (IDES) UMR 8148CNRS Université de Paris-Sud

With the analysis of the sources and formation mechanism of the clay minerals in the sediment core from the Dalianhai lake in the Gonghe Basin,northeastern Tibet-Qinghai Plateau,clay mineral composition proxies,grain-size and carbonate contents have been employed for high-resolution study in order to reconstruct East Asian Summer Monsoon （EASM） over the northeastern Tibet-Qinghai Plateau during the *** study also extended to establish a relationship between vegetation cover changes and erosion during the last 14.5 ka with pollen record and clay mineral ***/kaolinite and smectite/（illite＋chlorite） ratios allow us to assess hydrolysis conditions in lowlands and/or physical erosion process in highlands of the Gonghe *** 12.9 Cal ka BP,both mineralogical ratios show low values indicative of strong physical erosion in the basin with a dominant cold and dry *** 12.9 Cal ka BP,an increase in both mineralogical ratios indicates enhanced chemical weathering in the basin associated with a warm and humid *** beginning of Holocene is characterized by high smectite/（illite＋chlorite） and smectite/kaolinite ratios that is synchronous as with deposition of many peat laminae,implying the best warm and humid conditions specifically between 8.0 to 5.5 Cal ka *** time interval after 5.0 Cai ka BP is characterized by a return to high physical erosion and low chemical weathering with dry climate conditions in the *** variations of clay mineral assemblages with previous pollen results,we observe a rapid response in terms of chemical weathering and physical erosion intensity to a modification of the vegetation cover in the basin.

关键词： clay minerals vegetation Gonghe Basin Tibet-Qinghai Plateau Asian monsoon Holocene

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Predictive-reactive Strategy for Flowshop Rescheduling Problem:Minimizing the Total Weighted Waiting Times and Instability

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Journal of Systems Science and Systems Engineering 2021年第3期30卷 253-275页

作者： Ayoub Tighazoui christophe.Sauvey Nathalie Sauer Universitéde Lorraine LGIPMF-57000MetzFrance

Due to the fourth revolution experiencing,referred to as Industry 4.0,many production firms are devoted to integrating new technological tools to their manufacturing *** of them,is rescheduling the tasks on the machines responding to ***,for static scheduling,the efficiency criteria measure the performance of scheduling systems,in dynamic environments,the stability criteria are also used to assess the impact of jobs *** this paper,a new performance measure is investigated for a flowshop rescheduling *** one considers simultaneously the total weighted waiting time as the efficiency criterion,and the total weighted completion time deviation as the stability *** fusion could be a very helpful and significant measure for real life industrial *** disruption types are considered:jobs arrival and jobs ***,a Mixed Integer Linear Programming(MILP)model is developed,as well as an iterative predictive-reactive strategy for dealing with the online *** last,two heuristic methods are proposed and discussed,in terms of solution quality and computing time.

关键词： Rescheduling flowshop predictive-reactive strategy weighted waiting time stability weighted completion time deviation

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