Modeling and Simulating Distributed Industrial Systems - A Multi-Agent Methodological Approach

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.60.2430&rep=rep1&type=pdfDraftWe are located in the context of the industrial system simulation, which are complex and distributed in operational, informational and decisional terms. In this chapter, we present the problems and a methodological solution. This methodology is based on the systemic approach and on multi-agent systems. It allows the modelling of distributed industrial systems such as enterprise consortiums. Moreover, it proposes a software platform architecture whish is currently instanced with Arena and dedicated agents

How to specify an simulation model of an industrial system in MaMA-S

http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.140.3780International audienceWe are located in the context of industrial system simulation. These system are complex and distributed in operational, decisional and informational terms. This article is divided into two parts. The first has for object to position us within the framework of a modeling and specification methodology, for which a study was suggested by [Galland, 1999]. We briefly expose the problems and the considered solution: a methodological approach called MAMA-S. The following section presents the first major stage of the MAMA-S's life cycle: specification of abstract simulation models. It allows to create industrial system models that will be su±ciently generic to be independent from the visions brought by the existing simulation tools. This phase is based on the concepts resulting from Uml and the multi-agent systems. In addition we introduce new modeling elements that taking into account the operational, the decisional and the informational distributions of the industrial systems. We conclude this article by a short presentation of a specific editor and two applications of the theories released by MAMA-S

Simulation of connected driving in hazardous weather conditions: General and extensible multiagent architecture and models

Based on historical records, driving in hazardous weather conditions is one of the most serious causes that lead to fatal accidents on roads in general and in United Arab Emirates (UAE) highways in particular. One solution for improving road safety is to equip the vehicles and infrastructure with connected and smart devices. Before deploying a concrete solution to the field, it must be validated by simulation, and more specifically agent-based simulation. Several key features are expected for the simulation framework, such as the reproduction of different and detailed behaviors for the components of the road infrastructure and for the drivers, simulate specific weather conditions and forecast their impacts on the global system behavior. Additionally, several technological features are related to recent advancements in agent software engineering and simulation. This paper proposes an agent-based model for the modeling and simulation of traffic in foggy weather conditions that covers the above features and technological requirements. The architecture is used and validated on two scenarios of traffic on UAE highways in foggy weather conditions. The first scenario does not include an intelligent transport system, and the second considers smart speed limit panels. From the experiments, the proposed model supports the expected key features, i.e., microscopic simulation of intelligent transport systems, including infrastructure and connected cars, and of different driving behaviors (human or autonomous car). Even if the included weather condition model is basic, a proof of concept is provided regarding the connection of an agent model and a weather condition model

Comparison of Reaction Time-based Collaborative Velocity Control and Intelligent Driver Model for Agent-based Simulation of Autonomous Car

Based on historical records, driving in hazardous weather conditions is one of the most serious causes that lead to fatal accidents on roads in general and in United Arab Emirates (UAE) highways in particular. One solution to improve road safety is to equip vehicles and infrastructure with connected and smart devices and convert them into autonomous vehicles. Before deploying a concrete solution to the field, it must be validated by simulation, and more specifically by agent-based simulation. In this paper, we propose to implement the Reaction Time-Based Collaborative Velocity Control (RT-CVC) model that was implemented in autonomous cars into an agent-based simulator. This model is compared to the Intelligent Driver Model (IDM), which is one of the standard longitudinal driving behaviors in simulation environments. The experimental results show that RT-CVC generates traffic flows with fewer vehicle collisions and shorter travel times. This positive analysis is balanced by the fact that RT-CVC is designed for autonomous cars, and IDM is designed to model human-drive decisions. Using RT-CVC for modeling a human driver may be counter productive in simulation experiments

Un modèle d'environnement pour la simulation multiniveau - Application à la simulation de foules

Cette thèse propose un modèle organisationnel et holonique de l'environnement pour la simulation des déplacements de piétons dans des bâtiments. Une foule de piétons peut être considérée comme un système composé d'un grand nombre d'entités en interaction, dont la dynamique globale ne peut se réduire à la somme des comportements de ses composants. La simulation multiniveau fondée sur les modèles multiagents holoniques constitue une approche permettant d'analyser la dynamique de tels systèmes. Elle autorise leur analyse en considérant plusieurs niveaux d'observation (microscopique, mésoscopique et macroscopique) et prend en compte les ressources de calcul disponibles. Dans ces systèmes, l'environnement est considéré comme l'une des parties essentielles. La dynamique des piétons composant la foule est alors clairement distinguée de celle de l'environnement dans lequel ils se déplacent. Un modèle organisationnel décrivant la structure et la dynamique de l'environnement est proposé. L'environnement est structurellement décomposé en zones, sous-zones, etc. Les organisations et les rôles de cet environnement sont projetés dans une société d'agents ayant en charge de simuler la dynamique de l'environnement et les différentes missions qui lui sont classiquement assignées dans les systèmes multiagents. Ce modèle précise également les règles de passage entre deux niveaux d'observation. Ainsi, chaque agent appartenant au modèle de l'environnement tente d'utiliser une approximation des comportements de ses sous-zones afin de limiter la consommation de ressources durant la simulation. La qualité de l'approximation entre ces deux niveaux d'observation est évaluée avec des indicateurs énergétiques. Ils permettent de déterminer si l'agent approxime correctement les comportements des agents associés aux sous-zones. En sus du modèle organisationnel et holonique proposé, nous présentons un modèle concret de la simulation de voyageurs dans un terminal d'aéroport. Ce modèle concret est implanté sur les plateformes JaSIM et Janus.This work presents a holonic organizational model of the environment for the simulation of pedestrians in buildings. A crowd of pedestrians is considered as a system composed of a large number of interacting entities. The global dynamics of this system cannot be reduced to the sum of the behaviors of its components, Multilevel simulation based on holonic multiagent models is one approach to analyze the dynamics of such systems. It allows their analysis by considering several levels of observation (microscopic, mesoscopic and macroscopic) and the available computing resources. In these systems, the environment is considered as an essential part. The behavior of the crowd is clearly distinguished from the behavior of the environment in which the pedestrians move. An organizational model is proposed to describe the structure and the dynamics of the indoor environment. This environment is structurally divided into areas, sub-areas, etc. Organizations and roles are mapped into a society of agents in charge of simulating the dynamics of the environment and their various missions in multiagent systems. This model also specifies the rules for changing the level of observation dynamically. Thus, each agent belonging to the model of the environment tries to use an approximation of behaviors of its sub-zones, and at the same time to minimize the resource consumption. The quality of the approximation between these two levels is evaluated with energy-based indicators. They help to determine if the agent approximates the behaviors of its sub-agents correctly. In addition to the organizational and holonic model proposed in this work, we present a concrete model of the simulation of passengers in an airport terminal. This concrete model is implemented on the platforms JaSIM and Janus.BELFORT-UTBM-SEVENANS (900942101) / SudocSudocFranceF

Opioid-free versus opioid-based anesthesia in pancreatic surgery

Peer reviewedPublisher PD

Correction to : Opioid-free versus opioid-based anesthesia in pancreatic surgery

Peer reviewedPublisher PD

Vanin-1 licenses inflammatory mediator production by gut epithelial cells and controls colitis by antagonizing peroxisome proliferator-activated receptor γ activity

Colitis involves immune cell–mediated tissue injuries, but the contribution of epithelial cells remains largely unclear. Vanin-1 is an epithelial ectoenzyme with a pantetheinase activity that provides cysteamine/cystamine to tissue. Using the 2,4,6-trinitrobenzene sulfonic acid (TNBS)-colitis model we show here that Vanin-1 deficiency protects from colitis. This protection is reversible by administration of cystamine or bisphenol A diglycidyl ether, a peroxisome proliferator-activated receptor (PPAR)γ antagonist. We further demonstrate that Vanin-1, by antagonizing PPARγ, licenses the production of inflammatory mediators by intestinal epithelial cells. We propose that Vanin-1 is an epithelial sensor of stress that exerts a dominant control over innate immune responses in tissue. Thus, the Vanin-1/pantetheinase activity might be a new target for therapeutic intervention in inflammatory bowel disease

Finalité et invention : perspectives architecturales et philosophiques

Seit der prominenten Stellung der utilitas in der vitruvianischen Trias wird die Aufgabe von Architektur und ihr Verhältnis zum Entwurf theoretisch reflektiert. Kategorien wie Zweck, Funktion oder commodité bilden dabei ebenso den Kern der Disziplin wie sie zunächst im scheinbaren Widerspruch zu Freiheit und Erfindung stehen. Dieses spannungsreiche Verhältnis manifestiert sich in einer Vielzahl von Gegensätzen: Normierung gegenüber künstlerischer Freiheit – Schaffen von Freiräumen für die Nutzer der Architektur gegenüber dem Ziel einer Prägung des Menschen durch den Architekten – das Abbilden von Formen und Strukturen aus den Bereichen der Natur, Technik oder Ökonomie gegenüber einem schöpferischen Individualismus. Dieses produktive Wechselspiel von Erfindung und Zweck verbindet in selten konsequenter Weise nicht nur die Bereiche Architektur und Philosophie miteinander, sondern auch die Mikro- und Makroebene eines Architekturdiskurses, der sich zwischen Baustelle und theoretischer Reflexion entfaltet.Depuis la célèbre formulation de l’utilitas au sein de la triade vitruvienne, la tâche de l’architecture et sa relation au projet ont fait l’objet d’une réflexion théorique intense. Des catégories telles que la finalité, la fonction ou la commodité forment le cœur de la discipline en même temps qu’elles semblent entrer en contradiction avec la liberté d’invention de l’architecte. Une telle tension se manifeste dans de nombreuses oppositions: normalisation contre liberté artistique; création d’espaces pour le libre usage de l’architecture contre volonté d’imprégnation de l’existence humaine par l’activité de l’architecte; reproduction de formes et de structures issues des domaines de la nature, de la technique et de l’économie contre individualisme créateur. Cette interaction productive entre invention et finalité permet non seulement de relier l’une à l’autre l’architecture et la philosophie, et ce d’une manière particulièrement intéressante, mais également les niveaux microscopiques et macroscopiques du discours architectural, qui se déploient entre le travail constructif sur le chantier et la réflexion théorique

Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS

While the sample of confirmed exoplanets continues to increase, the population of transiting exoplanets around early-type stars is still limited. These planets allow us to investigate the planet properties and formation pathways over a wide range of stellar masses and study the impact of high irradiation on hot Jupiters orbiting such stars. We report the discovery of TOI-615b, TOI-622b, and TOI-2641b, three Saturn-mass planets transiting main sequence, F-type stars. The planets were identified by the Transiting Exoplanet Survey Satellite (TESS) and confirmed with complementary ground-based and radial velocity observations. TOI-615b is a highly irradiated ($\sim$1277 $F_{\oplus}$) and bloated Saturn-mass planet (1.69$^{+0.05}_{-0.06}$$R_{Jup}$ and 0.43$^{+0.09}_{-0.08}$$M_{Jup}$) in a 4.66 day orbit transiting a 6850 K star. TOI-622b has a radius of 0.82$^{+0.03}_{-0.03}$$R_{Jup}$ and a mass of 0.30$^{+0.07}_{-0.08}$~$M_{Jup}$ in a 6.40 day orbit. Despite its high insolation flux ($\sim$600 $F_{\oplus}$), TOI-622b does not show any evidence of radius inflation. TOI-2641b is a 0.37$^{+0.05}_{-0.04}$$M_{Jup}$ planet in a 4.88 day orbit with a grazing transit (b = 1.04$^{+0.05}_{-0.06 }$) that results in a poorly constrained radius of 1.61$^{+0.46}_{-0.64}$$R_{Jup}$. Additionally, TOI-615b is considered attractive for atmospheric studies via transmission spectroscopy with ground-based spectrographs and $\textit{JWST}$. Future atmospheric and spin-orbit alignment observations are essential since they can provide information on the atmospheric composition, formation and migration of exoplanets across various stellar types.Comment: 16 pages, 17 figures, submitted to A&