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Dissertations / Theses on the topic 'Action algorithms'

Author: Grafiati
Published: 30 May 2022
Last updated: 19 July 2025

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1

Cox, Jürgen 1970. "Solution of sign and complex action problems with cluster algorithms." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8646.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2001.<br>Includes bibliographical references (p. [105]-109) and index.<br>Two kinds of models are considered which have a Boltzmann weight which is either not real or real but not positive and so standard Monte Carlo methods are not applicable. These sign or complex action problems are solved with the help of cluster algorithms. In each case improved estimators for the Boltzmann weight are constructed which are real and positive. The models considered belong to two classes: fermionic and non-fermionic models. An example
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2

Wanek, J. F. "Direct action of radiation on mummified cells : modelling of computed tomography by Monte Carlo algorithms." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1432807/.

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X-ray imaging is a non-destructive and preferred method in paleopathology to reconstruct the history of ancient diseases. Sophisticated imaging technologies such as computed tomography (CT) have become common for the investigation of skeletal disorders in human remains. The effects of CT exposure on ancient cells have not been quantitatively examined in the past and may be important for subsequent genetic analysis. To remedy this shortcoming, different Monte Carlo models were developed to simulate X-ray irradiation on ancient cells. Effects of mummification and physical processes were consider
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3

Oppon, Ekow CruickShank. "Synergistic use of promoter prediction algorithms: a choice of small training dataset?" Thesis, University of the Western Cape, 2000. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8222_1185436339.

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<p>Promoter detection, especially in prokaryotes, has always been an uphill task and may remain so, because of the many varieties of sigma factors employed by various organisms in transcription. The situation is made more complex by the fact, that any seemingly unimportant sequence segment may be turned into a promoter sequence by an activator or repressor (if the actual promoter sequence is made unavailable). Nevertheless, a computational approach to promoter detection has to be performed due to number of reasons. The obvious that comes to mind is the long and tedious process involved in eluc
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4

Umuhoza, Denise. "Metric of trust for mobile ad hoc networks using source routing algorithms." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8946_1183465240.

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<p>This thesis proposed and presented technical details of new probabilistic metrics of trust in the links wireless ad hoc networks for unobservable communications. In covert communication networks, only the end nodes are aware of the communication characteristics of the overall path. The most widely used protocols of ad hoc networks was overviewed. The routing protocols of ad hoc networks with trust considerations and select Destination Sequence Routing, a protocol that can be used in distributed ad hoc network settings for path discovery, was also reviewed. It establishes a path through whic
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5

Munaro, Matteo. "Robust perception of humans for mobile robots RGB-depth algorithms for people tracking, re-identification and action recognition." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423652.

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Human perception is one of the most important skills for a mobile robot sharing its workspace with humans. This is not only true for navigation, because people have to be avoided differently than other obstacles, but also because mobile robots must be able to truly interact with humans. In a near future, we can imagine that robots will be more and more present in every house and will perform services useful to the well-being of humans. For this purpose, robust people tracking algorithms must be exploited and person re-identification techniques play an important role for allowing robots to
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MONTELEONE, Vito. "WATCHING PEOPLE: ALGORITHMS TO STUDY HUMAN MOTION AND ACTIVITIES." Doctoral thesis, Università degli Studi di Palermo, 2020. http://hdl.handle.net/10447/395224.

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Nowadays human motion analysis is one of the most active research topics in Computer Vision and it is receiving an increasing attention from both the industrial and scientific communities. The growing interest in human motion analysis is motivated by the increasing number of promising applications, ranging from surveillance, human–computer interaction, virtual reality to healthcare, sports, computer games and video conferencing, just to name a few. The aim of this thesis is to give an overview of the various tasks involved in visual motion analysis of the human body and to present the issues
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7

Brualla, Barberà Llorenç. "Path integral Monte Carlo. Algorithms and applications to quantum fluids." Doctoral thesis, Universitat Politècnica de Catalunya, 2002. http://hdl.handle.net/10803/6577.

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Path integral Monte Carlo (PIMC) is a method suitable for quantum liquid simulations at finite temperature. We present in this thesis a study of PIMC dealing with the theory and algorithms related to it, and then two applications of PIMC to current research problems of quantum fluids in the Bolzmann regime. <br/>The first part encompasses a study of the different ingredients of a PIMC code: action, sampling and physical property estimators. Particular attention has been paid to Li-Broughton's higher order approximation to the action. Regarding sampling, several collective movement methods have
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8

Празднікова, Маргарита Олександрівна. "Додаток на базі Android «Кіногід» для керування контентом". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/34968.

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Структура та обсяг роботи. Пояснювальна записка дипломного проекту складається з шести розділів, містить 8 рисунків, 5 таблиць, 5 додатка, 45 джерел. Дипломний проект присвячений розробці додатку на базі Android “Кіногід”. У розділі аналіз існуючих рішень для систематизації інформації про кінопокази розглянуть існуючі сервіси їх функції та недоліки, які необхідно вдосконалити. У розділі аналіз мов програмування та технології розроблення Android додатку розглянуті теоретичні аспекти методів виконання завданяя всі можливі ускладнення та недоліки різних систем у розробці Android додатку. Т
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9

Stephanos, Dembe. "Machine Learning Approaches to Dribble Hand-off Action Classification with SportVU NBA Player Coordinate Data." Digital Commons @ East Tennessee State University, 2021. https://dc.etsu.edu/etd/3908.

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Recently, strategies of National Basketball Association teams have evolved with the skillsets of players and the emergence of advanced analytics. One of the most effective actions in dynamic offensive strategies in basketball is the dribble hand-off (DHO). This thesis proposes an architecture for a classification pipeline for detecting DHOs in an accurate and automated manner. This pipeline consists of a combination of player tracking data and event labels, a rule set to identify candidate actions, manually reviewing game recordings to label the candidates, and embedding player trajectories in
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10

Gill, Harnavpreet Singh. "Computationally Robust Algorithms for Hypoid Gear Cutting and Contact Line Determination using Ease-Off Methodology." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587499768039312.

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11

Chaaraoui, Alexandros Andre. "Vision-based Recognition of Human Behaviour for Intelligent Environments." Doctoral thesis, Universidad de Alicante, 2014. http://hdl.handle.net/10045/36395.

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A critical requirement for achieving ubiquity of artificial intelligence is to provide intelligent environments with the ability to recognize and understand human behaviour. If this is achieved, proactive interaction can occur and, more interestingly, a great variety of services can be developed. In this thesis we aim to support the development of ambient-assisted living services with advances in human behaviour analysis. Specifically, visual data analysis is considered in order to detect and understand human activity at home. As part of an intelligent monitoring system, single- and multi-view
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12

Seita, Marcelo Ruiz. "Simulação multi agente em mercados financeiros artificiais utilizando algoritmos genéticos." reponame:Repositório Institucional do FGV, 2014. http://hdl.handle.net/10438/11936.

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Submitted by Marcelo Seita (mrseita@gmail.com) on 2014-08-20T16:21:47Z No. of bitstreams: 1 Versão_4.3.pdf: 1745536 bytes, checksum: ae0ce9636f907bd1139ff730270fa1ce (MD5)<br>Approved for entry into archive by JOANA MARTORINI (joana.martorini@fgv.br) on 2014-08-20T16:29:41Z (GMT) No. of bitstreams: 1 Versão_4.3.pdf: 1745536 bytes, checksum: ae0ce9636f907bd1139ff730270fa1ce (MD5)<br>Made available in DSpace on 2014-08-20T19:02:48Z (GMT). No. of bitstreams: 1 Versão_4.3.pdf: 1745536 bytes, checksum: ae0ce9636f907bd1139ff730270fa1ce (MD5) Previous issue date: 2014-07-29<br>Aiming to establ
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13

Arseneau, Shawn. "Robust image segmentation towards an action recognition algorithm." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0033/MQ64210.pdf.

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14

Arseneau, Shawn. "Robust image segementation towards an action recognition algorithm." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30234.

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To facilitate proper recognition of a human's action from a video sequence, several key features must first be determined. Initially, the person performing the action must be isolated from the background scene. This information is then used to decipher pertinent action attributes that may include the center of mass, contours, and regions of motion. It is these characteristics that will become the feature elements in the recognition of a person's actions.<br>This thesis will investigate the various image processing tools available to obtain the aforementioned action attributes. The applicabilit
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15

Sharp, Graham R. "Recognition algorithms for actions of permutation groups on pairs." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244602.

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16

Duan, Jie. "Active Control of Vehicle Powertrain Noise Applying Frequency Domain Filtered-x LMS Algorithm." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1243614246.

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17

Singh, Krishna Kant. "Algorithmes pour la dynamique moléculaire restreinte de manière adaptative." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAM067/document.

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Les méthodes de dynamique moléculaire (MD pour Molecular Dynamics en anglais) sont utilisées pour simuler des systèmes volumineux et complexes. Cependant, la simulation de ce type de systèmes sur de longues échelles temporelles demeure un problème coûteux en temps de calcul. L'étape la plus coûteuse des méthodes de MD étant la mise à jour des forces entre les particules. La simulation de particules restreintes de façon adaptative (ARMD pour Adaptively Restrained Molecular Dynamics en anglais) est une nouvelle approche permettant d'accélérer le processus de simulation en réduisant le nombre de
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18

Sosnowski, Scott T. "Approximate Action Selection For Large, Coordinating, Multiagent Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1459468867.

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19

Bonnefoy, Antoine. "Elimination dynamique : accélération des algorithmes d'optimisation convexe pour les régressions parcimonieuses." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4011/document.

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Les algorithmes convexes de résolution pour les régressions linéaires parcimonieuses possèdent de bonnes performances pratiques et théoriques. Cependant, ils souffrent tous des dimensions du problème qui dictent la complexité de chacune de leur itération. Nous proposons une approche pour réduire ce coût calculatoire au niveau de l'itération. Des stratégies récentes s'appuyant sur des tests d'élimination de variables ont été proposées pour accélérer la résolution des problèmes de régressions parcimonieuse pénalisées tels que le LASSO. Ces approches reposent sur l'idée qu'il est profitable de dé
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20

Novoa, Del Toro Elva Maria. "Detecting active modules in multiplex biological networks." Thesis, Aix-Marseille, 2020. http://theses.univ-amu.fr.lama.univ-amu.fr/200514_NOVOADELTORO_173hc776k263go601dzf_TH(1).pdf.

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L'expression des gènes est régulée dans le temps, les types de cellules et les conditions. Nous avons de nos jours accès à des technologies nous permettant de mesurer l'expression des gènes. Nous pouvons donc calculer les différences d'expression génique entre patients et témoins, et identifier ainsi les gènes dont l'expression est dérégulées. Nous pouvons aussi essayer de trouver un enrichissement des fonctions cellulaires à partir de la liste des gènes dérégulés. Dans ce contexte, j'ai analysé les données d'expression transcriptomiques de patients ayant le syndrome progéria de Hutchinson-Gil
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21

Nkansah-Gyekye, Yaw. "An intelligent vertical handoff decision algorithm in next generation wireless networks." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_2726_1307443785.

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<p>The objective of the thesis research is to design such vertical handoff decision algorithms in order for mobile field workers and other mobile users equipped with contemporary multimode mobile devices to communicate seamlessly in the NGWN. In order to tackle this research objective, we used fuzzy logic and fuzzy inference systems to design a suitable handoff initiation algorithm that can handle imprecision and uncertainties in data and process multiple vertical handoff initiation parameters (criteria)<br>used the fuzzy multiple attributes decision making method and context awareness to desi
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22

Bellino, Kathleen Ann. "Computational Algorithms for Face Alignment and Recognition." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32847.

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Real-time face recognition has recently become available for the government and industry due to developments in face recognition algorithms, human head detection algorithms, and faster/low cost computers. Despite these advances, however, there are still some critical issues that affect the performance of real-time face recognition software. This paper addresses the problem of off-centered and out-of-pose faces in pictures, particularly in regard to the eigenface method for face recognition. We first demonstrate how the representation of faces by the eigenface method, and ultimately the p
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23

Bahramgiri, Moshen. "Algorithmic approaches to graph states under the action of local Clifford groups." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38936.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2007.<br>Includes bibliographical references (p. 87-88).<br>Graph states are quantum states (quantum codes) in qn-dimensional space ... (q being a power of some prime number) which can be described by graphs with edges labeled from the field of order q, Fq. Graph states are determined as a common eigenvector of independent elements of the n-fold Pauli group, on which the local Clifford group has a natural action. This action induces the natural action of the local Clifford group on graph states and hence, its action
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24

Best, Graeme. "Planning Algorithms for Multi-Robot Active Perception." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/19781.

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A fundamental task of robotic systems is to use on-board sensors and perception algorithms to understand high-level semantic properties of an environment. These semantic properties may include a map of the environment, the presence of objects, or the parameters of a dynamic field. Observations are highly viewpoint dependent and, thus, the performance of perception algorithms can be improved by planning the motion of the robots to obtain high-value observations. This motivates the problem of active perception, where the goal is to plan the motion of robots to improve perception performance. Thi
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25

Duvenage, Eugene. "miRNAMatcher: High throughput miRNA discovery using regular expressions obtained via a genetic algorithm." Thesis, University of the Western Cape, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5752_1266536340.

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<p>In summary there currently exist techniques to discover miRNA however both require many calculations to be performed during the identification limiting their use at a genomic level. Machine learning techniques are currently providing the best results by combining a number of calculated and statistically derived features to identify miRNA candidates, however almost all of these still include computationally intensive secondary-structure calculations. It is the aim of this project to produce a miRNA identification process that minimises and simplifies the number of computational elements requ
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26

Ndiaye, Eugene. "Safe optimization algorithms for variable selection and hyperparameter tuning." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLT004/document.

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Le traitement massif et automatique des données requiert le développement de techniques de filtration des informations les plus importantes. Parmi ces méthodes, celles présentant des structures parcimonieuses se sont révélées idoines pour améliorer l’efficacité statistique et computationnelle des estimateurs, dans un contexte de grandes dimensions. Elles s’expriment souvent comme solution de la minimisation du risque empirique régularisé s’écrivant comme une somme d’un terme lisse qui mesure la qualité de l’ajustement aux données, et d’un terme non lisse qui pénalise les solutions complexes. C
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27

Ahmed, Fareed. "Un nouvel a priori de formes pour les contours actifs." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4008/document.

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Les contours actifs sont parmi les méthodes de segmentation d'images les plus utilisées et de nombreuses implémentations ont vu le jour durant ces 25 dernières années. Parmi elles, l'approche greedy est considérée comme l'une des plus rapides et des plus stables. Toutefois, quelle que soit l'implémentation choisie, les résultats de segmentation souffrent grandement en présence d'occlusions, de concavités ou de déformation anormales de la forme. Si l'on dispose d'informations a priori sur la forme recherchée, alors son incorporation à un modèle existant peut permettre d'améliorer très nettement
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28

Tlaiss, Ziad. "Automated network packet traces analysis methods for fault recognition and TCP flavor identification." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2023. http://www.theses.fr/2023IMTA0384.

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Ces dernières années, le domaine du dépannage réseau a suscité un intérêt particulier de la part des chercheurs en raison de la complexité et de l’importance de cette tâche. Le travail présenté dans cette thèse se concentre sur l’automatisation du dépannage réseau à l’aide de mesures de performance extraites des captures de paquets. La première contribution de cette thèse réside dans l’extraction de caractéristiques permettant d’identifier la cause fondamentale d’une anomalie en analysant des traces de paquets TCP montrant des connexions médiocres. Nous avons classé quatre causes de dégradatio
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Ndiaye, Eugene. "Safe optimization algorithms for variable selection and hyperparameter tuning." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLT004.

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Le traitement massif et automatique des données requiert le développement de techniques de filtration des informations les plus importantes. Parmi ces méthodes, celles présentant des structures parcimonieuses se sont révélées idoines pour améliorer l’efficacité statistique et computationnelle des estimateurs, dans un contexte de grandes dimensions. Elles s’expriment souvent comme solution de la minimisation du risque empirique régularisé s’écrivant comme une somme d’un terme lisse qui mesure la qualité de l’ajustement aux données, et d’un terme non lisse qui pénalise les solutions complexes. C
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Swathanthira, Kumar Murali Murugavel Manjakkattuvalasu. "Implementation of an actuator placement, switching algorithm for active vibration control in flexible structures." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-1120102-210634.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: Actuator placement algorithm; piezoelectric actuators; LQR; Galerkin; supervisory control; active vibration control; FEA; switching policy; dSPACE. Includes bibliographical references (p. 58-64).
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31

Salcburger, Martin. "Semiaktivní systém odpružení vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254452.

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The aim of this diploma thesis is to design algorithms of semi-active suspension system for a quarter car model, compare their function with respect to ride comfort and drive safety. Consequently, setup control algorithms for using in the Adams software. The result of this thesis should be to determine the effect of semi-active suspension control system on vehicle behavior.
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32

Carneiro, Milena Bueno Pereira. "Reconhecimento de íris utilizando algoritmos genéticos e amostragem não uniforme." Universidade Federal de Uberlândia, 2010. https://repositorio.ufu.br/handle/123456789/14276.

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The automatic recognition of individuals through the iris characteristics is an e±cient biometric technique that is widely studied and applied around the world. Many image processing stages are necessary to make possible the representation and the interpretation of the iris information. This work presents the state of the art in iris recognition systems where the most re- markable works and the di®erent techniques applied to perform each process- ing stage are quoted. The implementations of each processing stage using traditional techniques are presented and, afterwards, two innovator methods
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33

Greenwood, Aaron Blake. "Implementation of Adaptive Filter Algorithms for the Suppression of Thermoacoustic Instabilities." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31299.

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The main goal of this work was to develop adaptive filter algorithms and test their performance in active combustion control. Several algorithms were incorporated, which are divided into gradient descent algorithms and pattern searches. The algorithms were tested on three separate platforms. The first was an analog electronic simulator, which uses a second order acoustics model and a first order low pass filter to simulate the flame dynamics of an unstable tube combustor. The second was a flat flame, methane-air Rijke tube. The third can be considered a quasi-LDI liquid fuel combustor w
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Araújo, Willian Fernandes. "As narrativas sobre os algoritmos do Facebook : uma análise dos 10 anos do feed de notícias." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/157660.

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Esta tese acompanha a construção do Feed de Notícias do Facebook ao longo dos seus primeiros 10 anos (2006-2016) com o objetivo de descrever as formas como o mecanismo e a noção de algoritmo são definidos ao longo do período estudado. São analisados os conteúdos digitais, chamados de dispositivos textuais, que compõem publicamente o que o Feed de Notícias é e faz, descrevendo os atores implicados na composição dessa narrativa, mapeando seus objetivos e seus efeitos. A amostra analisada toma como ponto de partida os dispositivos textuais alocados em dois espaços digitais institucionais do Faceb
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35

Rousselle, Jean-Jacques. "Les contours actifs, une méthode de ségmentation : application à l'imagerie médicale." Tours, 2003. http://www.theses.fr/2003TOUR4032.

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Les méthodes de segmentation d'images sont nombreuses ; toutes présentent des avantages mais ne donnent pas entière satisfaction. Toutes doivent être adaptées en fonction des appplications que l'on se propose de réaliser. Les contours actifs ou modèles déformables ont permis de s'affranchir du chaînage des points du contour mais nécessitent le réglage de nombreux paramètres. Les contours actifs que nous avons étudiés sont implémentés par un algorithme "greedy". D'abord, nous proposons une variante basée sur une minimisation par algorithme génétique. Puis nous présentons trois approches pour ré
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Bornschlegell, Augusto Salomao. "Optimisation aérothermique d'un alternateur à pôles saillants pour la production d'énergie électrique décentralisée." Thesis, Valenciennes, 2012. http://www.theses.fr/2012VALE0023/document.

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La présente étude concerne l’étude d’optimisation thermique d’une machine électrique. Un modèle nodal est utilisé pour la simulation du champ de température. Ce modèle résout l’équation de la chaleur en trois dimensions, en coordonnées cylindriques et en régime transitoire ou permanent. On prend en compte les deux mécanismes de transport les plus importants : La conduction et la convection. L’évaluation de ce modèle est effectuée par l’intermédiaire de 13 valeurs de débits de référence. C’est en faisant varier ces variables qu’on évalue la performance du refroidissement dans la machine. Avant
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Hossain, M. Alamgir, M. O. Tokhi, and Keshav P. Dahal. "Impact of algorithm design in implementing real-time active control systems." Springer, 2004. http://hdl.handle.net/10454/2597.

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This paper presents an investigation into the impact of algorithm design for real-time active control systems. An active vibration control (AVC) algorithm for flexible beam systems is employed to demonstrate the critical design impact for real-time control applications. The AVC algorithm is analyzed, designed in various forms and implemented to explore the impact. Finally, a comparative real-time computing performance of the algorithms is presented and discussed to demonstrate the merits of different design mechanisms through a set of experiments.
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Loth, Manuel. "Algorithmes d'Ensemble Actif pour le LASSO." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2011. http://tel.archives-ouvertes.fr/tel-00845441.

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Cette thèse aborde le calcul de l'opérateur LASSO (Least Absolute Shrinkage and Selection Operator), ainsi que des problématiques qui lui sont associées, dans le domaine de la régression. Cet opérateur a suscité une attention croissante depuis son introduction par Robert Tibshirani en 1996, par sa capacité à produire ou identi fier des modèles linéaires parcimonieux à partir d'observations bruitées, la parcimonie signi fiant que seules quelques unes parmi de nombreuses variables explicatives apparaissent dans le modèle proposé. Cette sélection est produite par l'ajout à la méthode des moindres
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39

RUGGERI, SIMONA. "Centralised and decentralised control of active distribution systems: models, algorithms and applications." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266574.

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Power system were traditionally planned and designed by assuming unidirectional power flows from power stations to loads. Nowadays, several factors (e.g., liberalization of the electricity market, need of increased reliability, and environmental issues) lead to a situation where electricity is produced also downstream the transmission level. Connecting generators to the distribution networks could provide several benefits to the whole system, but also technical and safety problems that must be faced. On the other hand, the loads are changing: new loads like electric vehicles and electric pumps
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40

Nguyen, Vu-Linh. "Imprecision in machine learning problems." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2433.

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Nous nous sommes concentrés sur la modélisation et l'imprécision dans les problèmes d'apprentissage automatique, où les données ou connaissances disponibles souffrent d'imperfections importantes. Dans ce travail, les données imparfaites font référence à des situations où certaines caractéristiques ou les étiquettes sont imparfaitement connues, c'est-à-dire peuvent être spécifiées par des ensembles de valeurs possibles plutôt que par des valeurs précises. Les apprentissages à partir de données partielles sont couramment rencontrés dans divers domaines, tels que la biostatistique, l'agronomie ou
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41

Aidarous, Yasser. "Optimisation des modèles actifs d'apparence." Rennes 1, 2012. http://www.theses.fr/2012REN1S037.

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Nous utilisons les modèles actifs d'apparence (AAM) pour l'alignement de bouchessous différentes expressions. Cependant, la prédiction utilisée par cette méthodes'avère très sensible à l'initialisation et consommatrice à la fois en temps de calcul eten espace mémoire. Nous remplaçons la prédiction classique des AAM par uneoptimisation basée sur le simplexe de Nelder &amp; Mead. Nous utilisons unecombinaison de Gaussiennes pour initialiser le simplexe et contraindre les solutionsproposées, à l'aide d'un calcul d'appartenance en temps réel, à appartenir à unespace d'apparences plausibles. Les pa
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42

Liu, Siwei. "Apport d'un algorithme de segmentation ultra-rapide et non supervisé pour la conception de techniques de segmentation d'images bruitées." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4371.

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La segmentation d'image constitue une étape importante dans le traitement d'image et de nombreuses questions restent ouvertes. Il a été montré récemment, dans le cas d'une segmentation à deux régions homogènes, que l'utilisation de contours actifs polygonaux fondés sur la minimisation d'un critère issu de la théorie de l'information permet d'aboutir à un algorithme ultra-rapide qui ne nécessite ni paramètre à régler dans le critère d'optimisation, ni connaissance a priori sur les fluctuations des niveaux de gris. Cette technique de segmentation rapide et non supervisée devient alors un outil é
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43

Moura, Carolina Silva de. "Associações sociotécnicas: mediações algorítmicas e a economia das ações no Facebook." Universidade Federal de Goiás, 2018. http://repositorio.bc.ufg.br/tede/handle/tede/8427.

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Submitted by Franciele Moreira (francielemoreyra@gmail.com) on 2018-05-03T13:53:27Z No. of bitstreams: 2 Dissertação - Carolina Silva de Moura - 2018.pdf: 5329584 bytes, checksum: 5bfa61f6504213d3213b09998b948dfa (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-05-03T14:53:50Z (GMT) No. of bitstreams: 2 Dissertação - Carolina Silva de Moura - 2018.pdf: 5329584 bytes, checksum: 5bfa61f6504213d3213b09998b948dfa (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5
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Oz, Sinan. "Implement Of Three Segmentation Algorithms For Ct Images Of Torso." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612866/index.pdf.

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Many practical applications in the field of medical image processing require valid and reliable segmentation of images. In this dissertation, we propose three different semi-automatic segmentation frameworks for 2D-upper torso medical images to construct 3D geometric model of the torso structures. In the first framework, an extended version of the Otsu&rsquo<br>s method for three level thresholding and a recursive connected component algorithm are combined. The segmentation process is accomplished by first using Extended Otsu&rsquo<br>s method and then labeling in each consecutive slice. Since
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Gupta, Vaibhav. "A Characterization of Wireless Network Interface Card Active Scanning Algorithms." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/cs_theses/28.

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In this thesis, we characterize the proprietary active scanning algorithm of several wireless network interface cards. Our experiments are the first of its kind to observe the complete scanning process as the wireless network interface cards probe all the channels in the 2.4GHz spectrum. We discuss the: 1) correlation of channel popularity during active scanning and access point channel deployment popularity; 2) number of probe request frames statistics on each channel; 3) channel probe order; and 4) dwell time. The knowledge gained from characterizing wireless network interface cards is imp
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46

Cabell, Randolph H. III. "A Principal Component Algorithm for Feedforward Active Noise and Vibration Control." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30461.

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A principal component least mean square (PC-LMS) adaptive algorithm is described that has considerable benefits for large control systems used to implement feedforward control of single frequency disturbances. The algorithm is a transform domain version of the multichannel filtered-x LMS algorithm. The transformation corresponds to the principal components of the transfer function matrix between the sensors and actuators in a control system at a single frequency. The method is similar to other transform domain LMS algorithms because the transformation can be used to accelerate conve
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Johansson, Sven. "Active Control of Propeller-Induced Noise in Aircraft : Algorithms & Methods." Doctoral thesis, Karlskrona, Ronneby : Blekinge Institute of Technology, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00171.

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In the last decade acoustic noise has become more and more regarded as a problem. In cars, boats, trains and aircraft, low-frequency noise reduces comfort. Lightweight materials and more powerful engines are used in high-speed vehicles, resulting in a general increase in interior noise levels. Low-frequency noise is annoying and during periods of long exposure it causes fatigue and discomfort. The masking effect which low-frequency noise has on speech reduces speech intelligibility. Low-frequency noise is sought to be attenuated in a wide range of applications in order to improve comfort and s
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48

Mathema, Najma. "Predicting Plans and Actions in Two-Player Repeated Games." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8683.

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Artificial intelligence (AI) agents will need to interact with both other AI agents and humans. One way to enable effective interaction is to create models of associates to help to predict the modeled agents' actions, plans, and intentions. If AI agents are able to predict what other agents in their environment will be doing in the future and can understand the intentions of these other agents, the AI agents can use these predictions in their planning, decision-making and assessing their own potential. Prior work [13, 14] introduced the S# algorithm, which is designed as a robust algorithm for
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Nguyen, Thi Thanh. "Algorithmes gloutons orthogonaux sous contrainte de positivité." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0133/document.

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De nombreux domaines applicatifs conduisent à résoudre des problèmes inverses où le signal ou l'image à reconstruire est à la fois parcimonieux et positif. Si la structure de certains algorithmes de reconstruction parcimonieuse s'adapte directement pour traiter les contraintes de positivité, il n'en va pas de même des algorithmes gloutons orthogonaux comme OMP et OLS. Leur extension positive pose des problèmes d'implémentation car les sous-problèmes de moindres carrés positifs à résoudre ne possèdent pas de solution explicite. Dans la littérature, les algorithmes gloutons positifs (NNOG, pour
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50

Shieh, Yih-Dar. "Arithmetic Aspects of Point Counting and Frobenius Distributions." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4108/document.

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Cette thèse se compose de deux parties. Partie 1 étudie la décomposition des groupes de cohomologie pour une famille de courbes non hyperelliptiques de genre 3 avec une involution, et le bénéfice d'une telle décomposition dans le calcul de Frobenius utilisant l'algorithme de Kedlaya. L'involution d'une telle courbe C induit un morphisme de degré 2 vers une courbe elliptique E, ce qui donne une décomposition de Jac(C) en E et en une surface abélienne A, à partir desquelles le Frobenius sur C peut être récupérée. En E, le polynôme caractéristique du Frobenius peut être calculé en utilisant un al
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