Multi-agents Modeling and Simulation of the Spread of Tuberculosis in the City of Ngaoundéré (Cameroon)

In this paper, a model based on Multi-Agent Systems (MAS) of the spread of tuberculosis in the city of Ngaoundéré is proposed. After studying the behavior of the population and treatment using the software "OpenJUMP" of the satellite image of the city of Ngaoundéré, a multi-agent modeling of the population including individual activities, contraction and evolution of tuberculosis is made. This modeling followed the Gaia approach and used the modeling language AUML. The satellite image was processed in the integrated simulation platform GAMA and simulations were made. The simulation results show that in the absence of treatment, the rate of spread of tuberculosis in the city of Ngaoundéré, denoted T0 strongly depends on the behavior of individuals, the quantity of Koch Bacillus (BK) released by a sick individual, the life of a BK in the air. The analysis of T0 shows that there is a threshold beyond which the disease is endemic and below which it disappears.

An Architecture for Misconfiguration Patching of Web Services: A Case Study of Apache Server

Services are usually left configured by default and therefore subjects to vulnerabilities because they are not security enforced. Web services are so popular that they are targets of attacks to intrusions related to vulnerabilities discovered by attackers. This work proposes an architecture for patching Web service misconfigurations related to existing vulnerabilities. The approach underlying this architecture first retrieves and structures anti-vulnerability measures published by the official service manufacturers. Second, it evaluates the risk level using Common Vulnerability Scoring System (CVSS) on the current state of configurations. The proposed approach has been applied on Apache server on four vulnerabilities: version discovery, XSS, SQL injection and deny of service. Experimental results on a vulnerable environment demonstrate that the proposed approach considerably reduces vulnerabilities compared to similar solutions

Un modèle stochastique pour la propagation du VIH/SIDAUne approche individuelle-centrée

Le but de cette thèse est de mettre en place un modèle informatique de simulation stochastique et individucentré qui simule la dynamique démo-épidémiologique du VIH/SIDA dans une population hétérosexuelle à régime matrimoniale polygamique incluant des prostituées et leurs clients. Chaque individu admet un certain nombre de propriétés qui donnent à tout instant des renseignements sur son comportement sexuel et son infectivité, sa fécondabilité ou qui permettent de l identifier. Ce modèle se veut beaucoup plus réaliste que les modèles existants et intégre des paramètres démographiques et épidémiologiques qui peuvent avoir un effet sur la dynamique démo-épidémiologique. Son côté individu-centré donne la possibilité d introduire de l hétérogénéité sur chaque propriété individuelle et en plus facilite son extension. La durée de l abstinence sexuelle et des liaisons de longue durée ont un faible effet sur la propagation de la maladie. La probabilité de transmission maximale à la fin de la séroconversion et le nombre mensuel de visites d un client chez les prostituée ont un effet important sur la propagation. Le modèle montre par exemple que si chaque client visite en moyenne une prostituée par mois alors les taux de transmission sont insuffisants pour que l épidémie soit généralisée. Si ce nombre passe à 2 visites par mois alors au moins 80% de prostituées, 40% de clients et 14% des adultes deviennent infectés. Avec une probabilité de transmission maximale égale à 0.018 l épidémie disparaît même avec 2 visites de clients par mois. Nos résultats montrent l importance des prostituées et de la probabilité de transmission du VIH/SIDA par voie hétérosexuelle.The purpose of this work is to develop an individual-based model of the population dynamics of HIV/AIDS in a heterosexual population that includes polygamous and clients-sex worker relationships. Each individual has a certain number of attributes concerning his/her sexual behaviour, infectivity, and fertility. The model attempts to be more realistic than existing models by incorporating a number of relevant demoepidemiologic parameters. The model incorporates various forms of heterogeneity and can easily be extended. The duration between partnerships and the duration of long-term partnerships have a small effect on the spread of the disease. The peak probability of transmission during the early high infectivity period and the monthly number of prostitute visits have a large effect on the spread. If each client visits one prostitute per month the disease cannot spread. If this number doubles to two, then 80% of prostitutes, 40% of clients, and 14% of the population at large become infected. With a maximum probability of transmission of 0.018, the disease disappears, even with two visits per month. Our work highlights the importance of the probability of transmission and of the client-sex worker relationship.PAU-BU Sciences (644452103) / SudocSudocFranceF

Development of a Human-Agent Interaction System including Norm and Emotion in an Evacuation Situation (Student Abstract)

Agent-based modeling and simulation can provide a powerful test environment for crisis management scenarios. Human agent interaction has limitations in representing norms issued by an agent to a human agent that has emotions. In this study, we present an approach to the interaction between a virtual normative agent and a human agent in an evacuation scenario. Through simulation comparisons, it is shown that the method used in this study can more fully simulate the real-life out come of an emergency situation and also improves the au thenticity of the agent interaction

A critical review of the use of holonic paradigm in traffic and transportation systems

International audienceThe paper presents a critical review of the use of holonic paradigm in order to model and simulate traffic and transportation systems. After an introduction presenting the principles of this paradigm as well as its frameworks and concepts, the paper surveys existing works using the holonic paradigm for traffic and transportation applications. This is followed by a detailed analysis of the results of the survey. In particular, the relevance, the design approaches and the holonification orientation methodologies are investigated. Finally, based on this extensive review, open issues of holonic paradigm in modeling and simulation of traffic and transportation models are highlighted.Holonic multi-agent system; Holonic manufacturing system; Multilevel; Traffic; Transportatio