Search results for "Misa"
showing 10 items of 301 documents
Recherche Tabou Robuste pour l'allocation de fréquences
2014
National audience; 1. Problématique : depuis le démarrage des réseaux cellulaires (2G, 3G, 3.5G), les opérateurs configuraient manuellement la gestion des paramètres réseau. Avec l'apparition des réseaux 4G/LTE, la notion de Self-Organizing Network (SON) a vu le jour. Les SON introduisent des fonctions avancées de paramétrage automatique du réseau en fonction de la demande. Grâce à cette technologie, les opérateurs peuvent désormais améliorer la flexibilité et les performances du réseau en réduisant les coûts d'exploitation. Notre objectif est de proposer des solutions algorithmiques pouvant s'appliquer au SON. 2. Méthodologie : le problème d'allocation de fréquences est NP-difficile car il…
Utilisation des bras de mesure polyarticulés portables
2017
International audience; Les bras de mesure polyarticulés portables (articulated arm coordiante measuring machine : AACMM) sont des machines à mesurer tridimensionnelles portables comportant 6 ou 7 axes de rotation. Ils peuvent être utilisés actuellement avec un système de palpage à contact (statique ou dynamique) ou un scanner à nappe laser. Ils sont conçus principalement pour faire de la mesure sur site et dans différents environnements. Leurs flexibilité, facilité d’utilisation et coût moins élevé que le coût des machines à mesurer tridimensionnelles classiques, font partie des éléments phares permettant à ces dispositifs d'intégrer complétement les projets de l’usine du futur. Toutefois,…
Optimisation et implémentation de méthodes bio-inspirées d'extraction de caractéristiques pour la reconnaissance d'objets visuels
2016
Industry has growing needs for so-called “intelligent systems”, capable of not only ac-quire data, but also to analyse it and to make decisions accordingly. Such systems areparticularly useful for video-surveillance, in which case alarms must be raised in case ofan intrusion. For cost saving and power consumption reasons, it is better to perform thatprocess as close to the sensor as possible. To address that issue, a promising approach isto use bio-inspired frameworks, which consist in applying computational biology modelsto industrial applications. The work carried out during that thesis consisted in select-ing bio-inspired feature extraction frameworks, and to optimize them with the aim t…
Une architecture générique de Systèmes de recommandation de combinaison d'items : application au domaine du tourisme
2011
This thesis gives a generalization of the recommendation principle of recommender systems. Instead of considering a recommendation as an item, it is considered as a combination of several items following a given pattern. A recommendation of a unique item is then a particular case of this type of recommendation. The proposed recommender system framework is based on an architecture derived from work in adaptive hypermedia systems. Three layers are defined: a semantic layer, a user layer and an intelligence layer. The semantic layer consists of two sub-layers, a sub-layer modeling the content according to the general knowledge of the domain and a sub-layer modeling the content according to the…
Étude de statistiques combinatoires et de leur impact en optimisation évolutionnaire
2021
This thesis studies combinatorial objects, with both an algorithmic and a combinatorial point of view. In the combinatorial part, we take care first, the enumeration of Catalan words avoiding pairs of patterns of length three, presenting the proofs of each case with various enumeration methods. Catalan words are particular growth-restricted words counted by the eponymous integer sequence. More precisely, we systematically explore the structural properties of the sets of words under consideration and give enumerating results by constructive bijections or bivariate generating functions with respect to the length and descent number. Then, we study a sorting machine using two stacks in s…
Prise de décision dynamique dans la sélection des maintenances des tournées de techniciens
2022
Local monomialization of generalized real analytic functions
2011
Generalized power series extend the notion of formal power series by considering exponents ofeach variable ranging in a well ordered set of positive real numbers. Generalized analytic functionsare defined locally by the sum of convergent generalized power series with real coe cients. Weprove a local monomialization result for these functions: they can be transformed into a monomialvia a locally finite collection of finite sequences of local blowingsup. For a convenient frameworkwhere this result can be established, we introduce the notion of generalized analytic manifoldand the correct definition of blowing-up in this category.
The Influence of the feedback control of the hexapod platform of the SAAM dynamic driving simulator on neuromuscular dynamics of the drivers
2012
Multi sensorial cues (visual, auditory, haptic, inertial, vestibular, neuromuscular) [Ang2] play important roles to represent a proper sensation (objectively) and so a perception (subjectively as cognition) in driving simulators. Driving simulator aims at giving the sensation of driving as in a real case. For a similar situation, the driver has to react in the same way as in reality in terms of ‘self motion’. To enable this behavior, the driving simulator must enhance the virtual immersion of the subject in the driving situation. The subject has to perceive the motion of his own body in the virtual scene of the virtual car as he will have in a real car. For that reason, restituting the iner…
Modeling and energy optimization of the operative parts of an air assisted drill
2016
In the context of sustainable farming, the optimization of the energy costs of agricultural operations allows shorter working times and high quality of the agricultural operations. This question relates particularly to the seeding. This operation one is decisive for the quality of the future harvest. The modern high capacity seed drills must be compatible with all the constraints. The main goal of this PhD thesis is thus to develop an innovative methodology, integrating the modeling tools, in order to reduce the energy consumption of the heavy seeding equipment. Thus, we explored four key aspects concerning air seed drill design: maneuverability of poly-articulated seed drills; establishmen…
La maximisation microéconomique du taux de profit
1992
National audience; Dans la théorie microéconomique traditionnelle, les firmes sont supposées maximiser le profit pur. Nous étudions ici l'impact de la prise en compte des actionnaires et d'un profit social rémunérant le capital. On montre les conséquences de l'abandon de la maximisation du profit pour considérer la maximisation du taux de profit social. Les cas de concurrence avec coefficient fixe de capital, monopole avec coefficient fixe de capital, monopole avec coefficient variable de capital sont étudiés. Les solutions fournies par les comportements de maximisation du profit et de maximisation du taux de profit sont comparées. On conclut à une réduction du volume d'investissement dans …