Resultats globals: 19 registres trobats en 0.01 segons.
Articles, 18 registres trobats
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 Articles 18 registres trobats  1 - 10  anar al registre:
1.
 10 p, 2.1 MB Saddle-node bifurcation of limit cycles in an epidemic model with two levels of awareness / Juher, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Rojas, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Saldaña, Joan (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) In this paper we study the appearance of bifurcations of limit cycles in an epidemic model with two types of aware individuals. All the transition rates are constant except for the alerting decay rate of the most aware individuals and the rate of creation of the less aware individuals, which depend on the disease prevalence in a non-linear way. [...] 2023 - 10.1016/j.physd.2023.133714 Physica D. Nonlinear phenomena, Vol. 448 (June 2023) , art. 133714
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 18 p, 409.4 KB Forward triplets and topological entropy on trees / Alsedà i Soler, Lluís (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Juher, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Mañosas Capellades, Francesc (Universitat Autònoma de Barcelona. Departament de Matemàtiques) We provide a new and very simple criterion of positive topological entropy for tree maps. We prove that a tree map f has positive entropy if and only if some iterate fk has a periodic orbit with three aligned points consecutive in time, that is, a triplet (a,b,c) such that fk(a)=b, fk(b)=c and b belongs to the interior of the unique interval connecting a and c (a forward triplet of fk). [...] 2022 - 10.3934/dcds.2021131 Discrete and continuous dynamical systems. Series A, Vol. 42, Issue 2 (February 2022) , p. 623-641
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 17 p, 1.3 MB Robustness of behaviorally induced oscillations in epidemic models under a low rate of imported cases / Juher, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Rojas, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Saldaña, Joan (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) This paper is concerned with the robustness of the sustained oscillations predicted by an epidemic ODE model defined on contact networks. The model incorporates the spread of awareness among individuals and, moreover, a small inflow of imported cases. [...] 2020 - 10.1103/PhysRevE.102.052301 Physical Review E, Vol. 102, Issue 5 (November 2020) , art. 52301
4.
 12 p, 1.2 MB A multilayer temporal network model for STD spreading accounting for permanent and casual partners / Vajdi, Aram (Kansas State University. Department of Electrical and Computer Engineering (USA)) ; Juher, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Saldaña, Joan (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Scoglio, Caterina (Kansas State University. Department of Electrical and Computer Engineering (USA)) Sexually transmitted diseases (STD) modeling has used contact networks to study the spreading of pathogens. Recent findings have stressed the increasing role of casual partners, often enabled by online dating applications. [...] 2020 - 10.1038/s41598-020-60790-0 Scientific reports, Vol. 10 (March 2020) , art. 3846
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 26 p, 983.4 KB Network-centric interventions to contain the Syphilis epidemic in San Francisco / Juher, David (Universitat de Girona) ; Saldaña, Joan (Universitat de Girona) ; Kohn, Robert (San Francisco Public Health Department (USA)) ; Bernstein, Kyle (Centers for Disease Control and Prevention (USA)) ; Scoglio, Caterina (Kansas State University (USA)) The number of reported early syphilis cases in San Francisco has increased steadily since 2005. It is not yet clear what factors are responsible for such an increase. A recent analysis of the sexual contact network of men who have sex with men with syphilis in San Francisco has discovered a large connected component, members of which have a significantly higher chance of syphilis and HIV compared to non-member individuals. [...] 2017 - 10.1038/s41598-017-06619-9 Scientific reports, Vol. 7 (July 2017) , art. 6464 2 documents
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 15 p, 876.8 KB Tuning the overlap and the cross-layer correlations in two-layer networks : application to an SIR model with awareness dissemination / Juher, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Saldaña, Joan (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) We study the properties of the potential overlap between two networks A,B sharing the same set of N nodes (a two-layer network) whose respective degree distributions p_A(k), p_B(k) are given. Defining the overlap coefficient as the Jaccard index, we prove that is very close to 0 when A and B are random and independently generated. [...] 2018 - 10.1103/PhysRevE.97.032303 Physical review E, Vol. 97, issue 3 (March 2018) , art. 32303
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 3 p, 583.8 KB Erratum to: A Network Epidemic Model with Preventive Rewiring: Comparative Analysis of the Initial Phase / Britton, Tom (Stockholm University. Department of Mathematics) ; Juher, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Saldaña, Joan (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) 2017 - 10.1007/s11538-017-0295-0 Bulletin of Mathematical Biology, Vol. 79 (2017) , p. 1687-1689
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 25 p, 826.6 KB A network epidemic model with preventive rewiring: comparative analysis of the initial phase / Britton, Tom (Stockholm University. Department of Mathematics) ; Juher, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Saldaña, Joan (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) This paper is concerned with stochastic SIR and SEIR epidemic models on random networks in which individuals may rewire away from infected individuals at some rate so-called preventive rewiring. The models are denoted SIR- and SEIR- and we focus attention on the early stages of an outbreak, where we derive expression for the basic reproduction number R_0 and the expected degree of the infectious nodes E(D_I) using two different approximation approaches. [...] 2017 - 10.1007/s11538-016-0227-4 Bulletin of Mathematical Biology, Vol. 78 Núm. 12 (2017) , p. 2427-2454
9.
 31 p, 570.9 KB On the minimum positive entropy for cycles on trees / Alsedà i Soler, Lluís (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Juher, David (Universitat de Girona. Departament d'Informàtica i Matemàtica Aplicada) ; Mañosas Capellades, Francesc (Universitat Autònoma de Barcelona. Departament de Matemàtiques) Consider, for any n ∈ N, the set Posn of all n-periodic tree patterns with positive topological entropy and the set Irrn ( Posn of all n-periodic irreducible tree patterns. The aim of this paper is to determine the elements of minimum entropy in the families Posn and Irrn. [...] 2017 - 10.1090/tran6677 Transactions of the American Mathematical Society, Vol. 369 Núm. 1 (2017) , p. 187-221
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 16 p, 291.8 KB Spectral properties of the connectivity matrix and the SIS-epidemic threshold for mid-size metapopulations / Juher, David (Universitat de Girona. Departament d'Informàtica i Matemàtica Aplicada) ; Mañosa Fernández, Víctor 1971- (Universitat Politècnica de Catalunya. Departament de Matemàtica Aplicada III) We consider the spread of an infectious disease on a heterogeneous metapopulation defined by any (correlated or uncorrelated) network. The infection evolves under transmission, recovering and migration mechanisms. [...] 2014 Mathematical Modelling of Natural Phenomena, Vol. 9 Núm. 2 (2014) , p. 108-120

Articles : 18 registres trobats   1 - 10  anar al registre:
 Documents de recerca 1 registres trobats
1.
 201 p, 1.2 MB Set of periods, topological entropy and combinatorial dynamics for tree and graph maps / Juher, David ; Alsedà i Soler, Lluís (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Mumbrú i Rodriguez, Pere, dir. ; Universitat Autònoma de Barcelona. Departament de Matemàtiques La tesi versa sobre sistemes dinàmics discrets 1-dimensionals, des d'un punt de vista combinatori i topològic. Estem interessats en les òrbites periòdiques i l'entropia topològica de les aplicacions contínues definides en arbres i grafs. [...] This memoir deals with one-dimensional discrete dynamical systems, from both a topological and a combinatorial point of view. We are interested in the periodic orbits and topological entropy of continuous self-maps defined on trees and graphs. [...] Bellaterra : Universitat Autònoma de Barcelona, 2004

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