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A multi-scale epidemic model of Salmonella infection with heterogeneous shedding 具有非均匀脱落的沙门氏菌感染的多尺度流行模型
ESAIM Proceedings and Surveys Pub Date : 2020-06-09 DOI: 10.1051/PROC/202067015
S. Labarthe, B. Laroche, Thi Nhu Trang Nguyen, Bastien Polizzi, F. Patout, M. Ribot, Tabea Stegmaier
{"title":"A multi-scale epidemic model of Salmonella infection with heterogeneous shedding","authors":"S. Labarthe, B. Laroche, Thi Nhu Trang Nguyen, Bastien Polizzi, F. Patout, M. Ribot, Tabea Stegmaier","doi":"10.1051/PROC/202067015","DOIUrl":"https://doi.org/10.1051/PROC/202067015","url":null,"abstract":"Salmonella strains colonize the digestive tract of farm livestock, such as chickens or pigs, without affecting them, and potentially infect food products, representing a threat for human health ranging from food poisoning to typhoid fever. It has been shown that the ability to excrete the pathogen in the environment and contaminate other animals is variable. This heterogeneity in pathogen carriage and shedding results from interactions between the host’s immune response, the pathogen and the commensal intestinal microbiota. In this paper we propose a novel generic multiscale modeling framework of heterogeneous pathogen transmission in an animal population. At the intra-host level, the model describes the interaction between the commensal microbiota, the pathogen and the inflammatory response. Random fluctuations in the ecological dynamics of the individual microbiota and transmission at between-host scale are added to obtain a drift-diffusion PDE model of the pathogen distribution at the population level. The model is further extended to represent transmission between several populations. The asymptotic behavior as well as the impact of control strategies including cleaning and antimicrobial administration are investigated through numerical simulation.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74228218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A remark on memory effects in constrained fluid systems 受限流体系统中记忆效应的评述
ESAIM Proceedings and Surveys Pub Date : 2020-01-15 DOI: 10.1051/PROC/202069056
C. Perrin
{"title":"A remark on memory effects in constrained fluid systems","authors":"C. Perrin","doi":"10.1051/PROC/202069056","DOIUrl":"https://doi.org/10.1051/PROC/202069056","url":null,"abstract":"The goal of this note is to put into perspective the recent results obtained on memory effects in partially congested fluid systems of Euler or Navier-Stokes type with former studies on free boundary obstacle problems and Hele-Shaw equations. In particular, we relate the notion of adhesion potential initially introduced in the context of dense suspension flows with the one of Baiocchi variable used in the analysis of free boundary problems.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86215400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Change-point detection, segmentation, and related topics 变更点检测、分割和相关主题
ESAIM Proceedings and Surveys Pub Date : 2020-01-01 DOI: 10.1051/proc/202068006
J. Bardet, V. Brault, S. Dachian, F. Enikeeva, B. Saussereau
{"title":"Change-point detection, segmentation, and related topics","authors":"J. Bardet, V. Brault, S. Dachian, F. Enikeeva, B. Saussereau","doi":"10.1051/proc/202068006","DOIUrl":"https://doi.org/10.1051/proc/202068006","url":null,"abstract":"Recent contributions to change-point detection, segmentation and inference for non-regular models are presented. Various problems are considered including the multiple change-point estimation with adaptive penalty for time series with different dependency structures, estimation of the singularity point in cusp-type models, inference for thresholded autoregressive models, and cross-segmentation of matrices.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76480580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Influence of the mode of reproduction on dispersal evolution during species invasion 物种入侵过程中繁殖方式对扩散进化的影响
ESAIM Proceedings and Surveys Pub Date : 2020-01-01 DOI: 10.1051/proc/202067008
V. Calvez, Joachim Crevat, L. Dekens, B. Fabrèges, Frédéric Kuczma, Florian Lavigne, G. Raoul
{"title":"Influence of the mode of reproduction on dispersal evolution during species invasion","authors":"V. Calvez, Joachim Crevat, L. Dekens, B. Fabrèges, Frédéric Kuczma, Florian Lavigne, G. Raoul","doi":"10.1051/proc/202067008","DOIUrl":"https://doi.org/10.1051/proc/202067008","url":null,"abstract":"We consider a reaction-diffusion-reproduction equation, modeling a population which is spatially heterogeneous. The dispersion of each individuals is influenced by its phenotype. In the literature, the asymptotic propagation speed of an asexual population has already been rigorously determined. In this paper we focus on the difference between the asexual reproduction case, and the sexual reproduction case, involving a non-local term modeling the reproduction. This comparison leads to a different invasion speed according to the reproduction. After a formal analysis of both cases, leading to a heuristic of the asymptotic behaviour of the invasion fronts, we give some numerical evidence that the acceleration rate of the spatial spreading of a sexual population is slower than the acceleration rate of an asexual one. The main difficulty to get sharper results on a transient comes from the non-local sexual reproduction term.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81883326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Some mathematical properties of a barotropic multiphase flow model 正压多相流模型的一些数学性质
ESAIM Proceedings and Surveys Pub Date : 2020-01-01 DOI: 10.1051/PROC/202069070
K. Saleh, N. Seguin
{"title":"Some mathematical properties of a barotropic multiphase flow model","authors":"K. Saleh, N. Seguin","doi":"10.1051/PROC/202069070","DOIUrl":"https://doi.org/10.1051/PROC/202069070","url":null,"abstract":"We study a model for compressible multiphase flows involving N non miscible barotopic phases where N is arbitrary. This model boils down to the barotropic Baer-Nunziato model when N = 2. We prove the weak hyperbolicity property, the non-strict convexity of the natural mathematical entropy, and the existence of a symmetric form.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80850286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Construction of a statistical learning tool based on ordinary differential equations to model the digestive behaviour of ross chickens 建立基于常微分方程的统计学习工具来模拟罗斯鸡的消化行为
ESAIM Proceedings and Surveys Pub Date : 2020-01-01 DOI: 10.1051/PROC/202067005
Nicolas Bloyet, Hélène Flourent, E. Frénod, Marouan Handa, Harold Moundoyi, T. Phuong
{"title":"Construction of a statistical learning tool based on ordinary differential equations to model the digestive behaviour of ross chickens","authors":"Nicolas Bloyet, Hélène Flourent, E. Frénod, Marouan Handa, Harold Moundoyi, T. Phuong","doi":"10.1051/PROC/202067005","DOIUrl":"https://doi.org/10.1051/PROC/202067005","url":null,"abstract":"Being able to monitor and forecast farm animal performances is a strategic problem in the agronomy industry. We use a Data-Model Coupling approach to build a biomimetic Statistical Learning tool taking into account some aspects of the biological dynamics of the animal body. The objective is to build a tool which is able to assimilate data about daily feed consumption and measured performances. The model encompasses several sub-models corresponding to compartments and permitting to mimic a kinetic process divided into several steps. Each sub-model contains parameters which can be learnt by using an optimization algorithm and data. The goal of the first application of the model on field data was to simulate and predict the growth of chickens. An experiment was performed during 70 days to collect every day the feed consumption and the weight gain of a male and a female chickens. After the learning of the model parameters, the model shows a very good approximation of the chicken’s weight evolution over time.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82585684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phase transitions in a two-species model for cell segregation and logistic growth 细胞分离和逻辑生长的两种模型中的相变
ESAIM Proceedings and Surveys Pub Date : 2020-01-01 DOI: 10.1051/proc/202067001
Luís Almeida, Kevin Atsou, M. Marulli, D. Peurichard, R. Tesson
{"title":"Phase transitions in a two-species model for cell segregation and logistic growth","authors":"Luís Almeida, Kevin Atsou, M. Marulli, D. Peurichard, R. Tesson","doi":"10.1051/proc/202067001","DOIUrl":"https://doi.org/10.1051/proc/202067001","url":null,"abstract":"We study a model of cell segregation in a population composed of two cell types. Starting from a model initially proposed in [3], we aim to understand the impact of a cell division process on the system’s segregation abilities. The original model describes a population of spherical cells interacting with their close neighbors by means of a repulsion potential and which centers are subject to Brownian motion. Here, we add a stochastic birth-death process in the agent-based model, that approaches a logistic growth term in the continuum limit. We address the linear stability of the spatially homogeneous steady states of the macroscopic model and obtain a precise criterion for the phase transition, which links the system segregation ability to the model parameters. By comparing the criterion with the one obtained without logistic growth, we show that the system’s segregation ability is the result of a complex interplay between logistic growth, diffusion and mechanical repulsive interactions. Numerical simulations are presented to illustrate the results obtained at the microscopic scale.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88945963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Opinion propagation on social networks: a mathematical standpoint 社交网络上的观点传播:一个数学的观点
ESAIM Proceedings and Surveys Pub Date : 2020-01-01 DOI: 10.1051/PROC/202067016
Hugo Lavenant, B. Maury
{"title":"Opinion propagation on social networks: a mathematical standpoint","authors":"Hugo Lavenant, B. Maury","doi":"10.1051/PROC/202067016","DOIUrl":"https://doi.org/10.1051/PROC/202067016","url":null,"abstract":"These lecture notes address mathematical issues related to the modeling of opinion propagation on networks of the social type. Starting from the behavior of the simplest discrete linear model, we develop various standpoints and describe some extensions: stochastic interpretation, monitoring of a network, time continuous evolution problem, charismatic networks, links with discretized Partial Differential Equations, nonlinear models, inertial version and stability issues. These developments rely on basic mathematical tools, which makes them accessible at an undergraduate level. In a last section, we propose a new model of opinion propagation, where the opinion of an agent is described by a Gaussian density, and the (discrete) evolution equation is based on barycenters with respect to the Fisher metric.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87899045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Modeling the spatial propagation of Aβ oligomers in Alzheimer’s Disease 阿尔茨海默病中Aβ低聚物的空间传播模型
ESAIM Proceedings and Surveys Pub Date : 2020-01-01 DOI: 10.1051/proc/202067003
Martín Andrade-Restrepo, Paul Lemarre, Laurent Pujo-Menjouet, L. M. Tine, S. Ciuperca
{"title":"Modeling the spatial propagation of Aβ oligomers in Alzheimer’s Disease","authors":"Martín Andrade-Restrepo, Paul Lemarre, Laurent Pujo-Menjouet, L. M. Tine, S. Ciuperca","doi":"10.1051/proc/202067003","DOIUrl":"https://doi.org/10.1051/proc/202067003","url":null,"abstract":"Recent advances in the study of Alzheimer’s Disease and the role of Aβ amyloid formation have caused the focus of biologists to progressively shift towards the smaller protein assemblies, the oligomers. These appear very early on in the disease progression and they seem to be the most infectious species for the neurons. We suggest a model of spatial propagation of Aβ oligomers in the vicinity of a few neurons, without considering the formation of large fibrils or plaques. We also include a simple representation of the oligomers neurotoxic effect. A numerical study reveals that the oligomers spatial dynamics are very sensitive to the balance between their diffusion and their replication, and that the outcome in terms of the progression of AD strongly depends on it.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90366713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Random walks in random sceneries and related models 随机场景中的随机漫步及相关模型
ESAIM Proceedings and Surveys Pub Date : 2020-01-01 DOI: 10.1051/proc/202068003
F. Pène
{"title":"Random walks in random sceneries and related models","authors":"F. Pène","doi":"10.1051/proc/202068003","DOIUrl":"https://doi.org/10.1051/proc/202068003","url":null,"abstract":"We present random walks in random sceneries as well as three related models: U-statistics indexed by random walks, a model of stratified media with inhomogeneous layers (random one-way streets) and the one-dimensional Lévy-Lorentz gas (random roundabouts on a line). We present in particular results obtained in collaboration with Castell, Guillotin-Plantard, Br. Schapira, Franke, Wendler, Aurzada, Bianchi and Lenci.","PeriodicalId":53260,"journal":{"name":"ESAIM Proceedings and Surveys","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86262654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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