Dissertations / Theses on the topic 'Flower machine'
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Лук'яненко, Ігор Анатолійович. "Лінія розливу миючих засобів у ПЕТ-пляшки з модернізацією вузла розливу." Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/30721.
Full textIn the course of the Master's thesis, the technological line of bottling detergents in PET bottles was selected. The design, principle of operation and characteristics of the bottling machine and the line as a whole are studied. In the master's thesis parametric and kinematic calculations were performed. The spring was calculated. In order to eliminate the disadvantages of the dispenser, namely, the low speed of the spill, the complexity of the design of the spill node, low accuracy of dosing was conducted patent-literature review of the design. The result was a prototype design of the filling device, which is placed directly in the flow tank and has a simplified design, which allows to increase productivity and reduce the cost of repair and maintenance of the machine as a whole. To confirm the upgrade, 3D models were developed in the SolidWorks environment of the base and upgraded units, and their calculation was performed in the ANSYS environment. The following sections were also completed: installation and operation, automation, labor protection, and a startup project was developed.
Bouzekri, Hacène. "Contribution à la commande des machines synchrones à aimants permanents." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL054N.
Full textRuelas, Rubén. "Intégration de l'expertise humaine en modélisation et identification floues de systèmes." Nancy 1, 1997. http://www.theses.fr/1997NAN10281.
Full textThis thesis deals with the modeling and identification of systems using the fuzzy sets theory. The focus is on the modeling of a system when not enough data is available about its behavior and in which a human being participates either as a sensor or as an expert. The first section is devoted to fuzzy modeling based on expert knowledge from experts, who know the functioning of the system to be modeled, or from the designer. In the first case, the fuzzification process has be studied in order to take into account the linguistic information. Making use of linguistic modifiers we propose to the experts two notions, precision and derivation, with the intention that they express their knowledge. In the first part of this work, we mainly use the aspect of precision for the construction of a fuzzy model. In the last part, the notion of derivation is used. Finally, we present a study demonstrating the influence of the fuzzy sets shape on functions approximation. Since we are mainly interested in fuzzy models with crisp outputs, the second part of this work is focused on defuzzification. After studying tlte theoretical basis of defuzzification, we specify the different objectives of the process with a classification according to different methods presented in the literature. Depending on the defuzzification method, this consists of a conversion from the fuzzy domain to a numerical one, a conversion with preferences, an optimized conversion according to a criterion, or a conversion under constraints. Following the classification, we propose three defuzzification methods to exploit the coded information of the output fuzzy set which correspond to the expert knowledge of the model output variable. The last section addresses the identification of the rules of a fuzzy model, particularly when the observations of the behavior's system are uncertain and imprecise. This method is used for the identification of fuzzy rules in the comfort evaluation of automobile seats. With this industrial application, we demonstrate the role of human operators, either as sensors or as experts, in the evaluation process. Finally, we have applied our method to the identification of the relationship between discomforts and seat characteristics
Berthereau, Frédérique. "Commande vectorielle multialgorithmique de la machine asynchrone avec optimisation par supervision floue." Lille 1, 2001. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2001/50376-2001-23.pdf.
Full textLes commandes multialgorithmiques concernent la combinaison de deux modèles de la vitesse angulaire statorique pour orienter le flux dans la machine et la combinaison de deux modèles du courant magnétisant pour estimer l'amplitude du flux. La combinaison de deux estimateurs de flux, l'un déterminé à partir des équations rotoriques de la machine, l'autre déterminé à partir des équations statoriques et la détermination des gains d'un observateur de flux d'ordre réduit ou d'ordre complet au moyen de la logique floue sont également étudiées. Pour chaque stratégie, l'étude de sensibilité est dans un premier temps validée par des essais experimentaux sur un banc équipé du système Matlab-Simulink-dSPACE (basé sur un DSP TMS320C31), en considérant les variations du courant statorique consommé comme indicateur de la qualité du contrôle du flux. Deux des stratégies de commande étudiées sont ensuite utilisées dans deux applications différentes, l'une concerne la traction électrique, l'autre la génération d'énergie par éoliennes
Tormo, Hélène. "Diversité des flores microbiennes des laits crus de chèvre et facteurs de variabilité." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1343/.
Full textThe microbial flora in raw milk plays a determining role in the technological and sensory quality of raw milk cheese. Studies on cow's milk have show that the season and some farming practices can have an impact on the levels and the equilibrium of this microflora. However, there is very little data regarding raw goat's milk. This study concerns (i) the evaluation of the major microbial groups and the main bacterial species in raw goat's milk using culture dependent and culture independent methods (ii) the knowledge of some factors of variability, including farming conditions and the season (spring 2006, winter 2007), on farms producing farmhouse cheese in different geographic areas. The main microfloras in decreasing order of importance are: coagulase negative staphylococci, micrococci and corynebacteria (Arthrobacter spp. , Brevibacterium linens), lactic acid bacteria (Lactococcus lactis, Enteroccocus faecalis, Leuconostoc spp. , Enterococcus faecium) and coliforms (Serratia spp. , Enterobacter spp. , Raoulterra planticola). The statistical analysis of the factors that can explain the variability of the microbial flora in milk has highlighted a seasonal effect as well as an effect of certain management practices. The nature of the bedding, the atmospheric conditions in the milking area, milking hygiene, as well as the attention given to animal health, are the main factors that could explain the significant differences and the distribution of bacterial groups and species in raw goat's milk. This work shows that it is possible, by making the right choices in terms of farming practices, to obtain milk of good sanitary quality in which the dominant microbial flora is of technological interest (lactic acid bacteria, micrococci and coryneform bacteria)
Koehl, Ludovic. "Conception et réalisation d'un estimateur de dimension fractale par utilisation de techniques floues." Lille 1, 1998. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1998/50376-1998-1.pdf.
Full textLanglet, Jonatan. "Towards Machine Learning Inference in the Data Plane." Thesis, Karlstads universitet, Institutionen för matematik och datavetenskap (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-72875.
Full textDeadman, Benjamin Jade. "New tools for flow chemistry and the machine assisted synthesis of pharmaceuticals." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648306.
Full textClement, Benjamin. "Adaptive Personalization of Pedagogical Sequences using Machine Learning." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0373/document.
Full textCan computers teach people? To answer this question, Intelligent Tutoring Systems are a rapidly expanding field of research among the Information and Communication Technologies for the Education community. This subject brings together different issues and researchers from various fields, such as psychology, didactics, neurosciences and, particularly, machine learning. Digital technologies are becoming more and more a part of everyday life with the development of tablets and smartphones. It seems natural to consider using these technologies for educational purposes. This raises several questions, such as how to make user interfaces accessible to everyone, how to make educational content motivating and how to customize it to individual learners. In this PhD, we developed methods, grouped in the aptly-named HMABITS framework, to adapt pedagogical activity sequences based on learners' performances and preferences to maximize their learning speed and motivation. These methods use computational models of intrinsic motivation and curiosity-driven learning to identify the activities providing the highest learning progress and use Multi-Armed Bandit algorithms to manage the exploration/exploitation trade-off inside the activity space. Activities of optimal interest are thus privileged with the target to keep the learner in a state of Flow or in his or her Zone of Proximal Development. Moreover, some of our methods allow the student to make choices about contextual features or pedagogical content, which is a vector of self-determination and motivation. To evaluate the effectiveness and relevance of our algorithms, we carried out several types of experiments. We first evaluated these methods with numerical simulations before applying them to real teaching conditions. To do this, we developed multiple models of learners, since a single model never exactly replicates the behavior of a real learner. The simulation results show the HMABITS framework achieves comparable, and in some cases better, learning results than an optimal solution or an expert sequence. We then developed our own pedagogical scenario and serious game to test our algorithms in classrooms with real students. We developed a game on the theme of number decomposition, through the manipulation of money, for children aged 6 to 8. We then worked with the educational institutions and several schools in the Bordeaux school district. Overall, about 1000 students participated in trial lessons using the tablet application. The results of the real-world studies show that the HMABITS framework allows the students to do more diverse and difficult activities, to achieve better learning and to be more motivated than with an Expert Sequence. The results show that this effect is even greater when the students have the possibility to make choices
Shelley, Anthony N. "INCORPORATING MACHINE VISION IN PRECISION DAIRY FARMING TECHNOLOGIES." UKnowledge, 2016. http://uknowledge.uky.edu/ece_etds/86.
Full textGuirchoun, Samuel. "Ordonnancement à machines parallèles avec serveur." Tours, 2004. http://www.theses.fr/2004TOUR4041.
Full textWe present in this PhD thesis an unusual approach for computer system scheduling. It's based on the study of the network entities behaviour during the execution of a distributed application in order to modelize the problem before establishing algorithms for its resolution. We start with an introduction to the scheduling problems and we introduce the notions necessary to the understanding of the computer architecture models, to parallelism and to the distributed applications. Precise analyses of some experimental results give us the necessary elements to place oneself in the typology currently employed in workshop scheduling. During these analyses we could extract several workshop scheduling problems. We started with studying the identical parallel machines problems with a single server, which at first sight seemed judicious. However their too slight approximation forced us to turn towards the hybrid flow shop which constitutes a more interesting approach. The study of that one enabled us to find several theoretical results as well as some algorithms efficient for its resolution
Giuffrida, Tanguy. "Fuzzy4U : un système d'adaptation des Interfaces Homme-Machine en logique floue pour l'accessibilité." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALM063.
Full textWith the massive spread of the use of the Internet and the computer tool in general, the accessibility of user interfaces is an increasingly pressing need. Ease of use of computing devices is indeed a critical point in fostering adoption. Thus, the difficulties experienced by certain users, such as the elderly or in a situation of neurocognitive difficulties, require more acutely the question of accessibility. Much work has focused on this subject in order to define generic or situational accessibility recommendations. One possible approach is to adapt the interfaces to the context of use. However, difficulties remain, particularly linked to the complexity of the possible contexts of use, leading to a multiplicity of characteristics to be taken into account, an imprecision of the values assigned to these characteristics and the combination of multiple adaptation rules. We address these three obstacles through the following research question: how to improve the accessibility of UIs through adaptive interfaces by taking into account the multiplicity of context characteristics, the imprecision of context values ; as well as the complexity and the combination of rules?By relying on a generic adaptation architecture, we propose a dynamic adaptation engine based on fuzzy logic, used to implement accessibility recommendations. We show how fuzzy logic manages the three obstacles identified through a prototype. We will highlight these advantages compared to a classical approach in Boolean logic. In order to validate these advantages, we carried out a comparative analysis between the 2 types of rules (fuzzy and binary logic) in a theoretical way and with an evaluation by experts. The results validate the interest of fuzzy logic for adapting interfaces for accessibility purposes
Von, Backstrom Theodor W. "From turbo-machines to solar chimneys." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71762.
Full textENGLISH ABSTRACT: This dissertation is basically a summary, with some interpretation, of published research by the author. The scope is limited to the fields of turbo-machinery, computational fluid dynamics and solar chimney power plants. The main contribution in the field of turbo-machinery in general is in the development of a through-flow method that automatically satisfies mass conservation. Concerning fan design, the contributions are the realization of the importance of the exit kinetic energy in the determination of the efficiency of rotor-only axial flow fans, and the quantification of the effect of off-axis inflow into cooling system fans on their performance. In the field of centrifugal fans and compressors an original, unifying model for the prediction of slip factor was developed. To investigate accident scenarios in closed cycle gas turbine nuclear reactors, all possible operational modes of multi-stage axial compressor operation caused by flow and rotation direction were investigated experimentally and computationally. Spanning the fields of turbo-machinery and solar chimneys, the basic theory of solar chimney turbines was developed, showing that high turbine efficiency was possible. In the field of solar chimneys, an original thermodynamic approach was developed to predict the main relationships that govern solar chimney performance, and to solve the through-flow equations for non-ideal systems with losses. Equations for the accurate determination of all the thermodynamic variables in a solar chimney as dependent on chimney height, wall friction, additional losses, internal drag and area change were derived and solved. Coefficients of wall friction, bracing wheel loss and exit kinetic energy were determined experimentally, and empirical equations were developed to predict the loss coefficient of the collector to turbine transition section and and the turbine inlet flow angle. A simple power law approach allowed the calculation of the optimal turbine pressure drop in solar chimney power plants. A comparison of two sets of equations used to calculate the heat fluxes into, inside and leaving the solar collector, resulted in similar air temperature rises in the collector, and similar produced power. It turned out however that the optimal flow for minimal turbine pressure drop was dependent on the heat transfer models. Investigation of the performance of various solar chimney turbo-generator layouts using analytical models and optimisation techniques showed that the optimal number of turbines varies with plant size, but the individual turbine size, the number of blades and even the efficiency remains close to constant. It was found that the cost of a turbogenerator system, however, varies significantly with size. A joint paper with several German universities and institutions did a comparative cost analysis of solar chimney power plants
AFRIKAANSE OPSOMMING: Hierdie verhandeling is basies ’n opsomming, met interpretasie, van gepubliseerde navorsing deur die outeur. Die omvang is beperk tot die gebiede van turbomasjinerie, berekeningsvloeidinamika en sonskoorsteenkragstasies. Die hoof bydrae op die gebied van turbomasjinerie in die algemeen is in die ontwikkeling van ’n deurvloeimetode wat outomaties massabehoud bevredig. Wat waaierontwerp betref is die bydrae die besef van die belangrikheid van die uitlaat kinetiese energie in die bepaling van waaierbenuttingsgraad, en die kwantifisering van die effek van af-as invloei in verkoelingswaaiers op hulle gedrag. Op die gebied van sentrifugaalwaaiers en -kompressors is ’n oorspronklike, samevattende model vir die voorspelling van glipfaktor ontwikkel. Om ongeluk-scenario’s in geslote kringloop gasturbine kenreaktors te ondersoek is al die moontlike werksmodusse veroorsaak deur vloei en rotasie rigting van ’n multistadium aksiaalkompressor eksperimenteel en numeries ondersoek. As brug tussen turbomasjinerie en sonskoorstene is die basiese teorie van sonskoorsteenturbines ontwikkel met die aanduiding dat hoë turbine benuttingsgraad moontlik is. Op die gebied van sonskoorstene is ’n oorspronklike termodinamies benadering ontwikkel om die hoofverwantskappe te voorspel wat sonskoorsteen gedrag bepaal, en om die deurvloei vergelykings op te los vir nie-ideale stelsels met verliese. Vergelykings vir die akkurate bepaling van al die termodinamiese veranderlikes in ’n sonskoorsteen soos afhanklik van skoorsteenhoogte, wandwrywing, bykomstige verliese, interne sleur en oppervlakte verandering is afgelei en opgelos. Koëffisiënte vir wandwrywing, verstywingswiel-verlies en uitlaat kinetiese energie is eksperimenteel bepaal, en empiriese vergelykings is ontwikkel om die verlieskoëffisiënt van die kollektor-tot-skoorsteen oorgang en die turbine inlaatvloeihoek te bepaal. ’n Eenvoudige magswet benadering het dit mootlik gemaak om die optimum turbine-drukval in sonskoorsteen aanlegte te bepaal. ’n Verglyking van twee stelle vergelykings om warmtevloede in, binne en uit die sonkollektor te bereken het gelei na soortgelyke temperatuurstygings en gelewerde drywing. Die optimale vloei vir maksimum drywing was egter afhanklik van die warmteoordrag modelle. Ondersoek van die gedrag van verskeie turbo-generator uitlegte, deur gebruik van analitiese modelle en optimeringstegnieke het getoon dat die optimale aantal turbines wissel met aanleg grootte, maar die individuele turbine grootte, die aantal lemme en selfs die benuttingsgraad bly feitlik konstant. Daar is egter gevind dat die koste van ’n turbogenerator stelsel beduidend wissel met grootte. ’n Gesamentlike artikel met verskeie Duitse universiteite en instansies het ’n vergelykende koste analise van sonskoorstene gedoen.
Steele, Joseph Ronald. "Optimizing mixing in the dilution system of a paper machine." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33887.
Full textHoward, Mitchell James. "Development of a machine-tooling-process integrated approach for abrasive flow machining (AFM) of difficult-to-machine materials with application to oil and gas exploration componenets." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/9262.
Full textKelarestaghi, Manoochehr. "Diagnostic de la qualité d'usinage en fraisage : techniques de recconnaissance de formes floues et de fusion des capteurs." Compiègne, 1999. http://www.theses.fr/1999COMP1227.
Full textKarlsson, Anders. "Cooling methods for electrical machines : Simulation based evaluation of cooling fins found on low voltage general purpose machines." Thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-217171.
Full textMålet med detta examensarbete var att identifiera intressanta koncept relaterade till kylning av elektriska maskiner och generatorer, som kunde utvärderas med lämplig programvara för datorsimuleringar. Under projektets gång så bestämdes det att fokusera på hur luften från en fläkt flödar längs med en generell lågspänningsmaskin, hur värmen överförs från ramen till den omgivande luften och hur temperaturfördelningen ser ut. Det undersöktes även om det var möjligt att förbättra effektiviteten av kylningen utan att ansluta extra kylanordningar. Undersökningarna fokuserades på olika fendesigner och dess påverkan på värmefördelningen. På grund av simuleringarnas komplexitet så har simuleringarna endast utförts på ett segment istället för hela maskinen. Validering av simuleringarna utfördes genom att jämföra de simulerade lufthastigheterna med verklig lufthastighet som mättes på två maskiner i testmiljö. Valideringen visade att simuleringarna överensstämmer väl med de mätningar som utfördes. Slutsatsen utifrån simuleringarna är att mindre förändringar av fenornas nuvarande design kan förbättra fenornas kylningsförmåga. Mätningarna av lufthastigheten ger även indikationer på att kylningen av maskinens utsida eventuellt kan förbättras genom små förändringar av ramens exteriör.
Fnaiech, Mohamed Amine. "Commandes non-linéaires et intelligentes pour le positionnement précis des machines hexaphasées." Amiens, 2009. http://www.theses.fr/2009AMIE0115.
Full textSecuring electric drives used in industry is a very interest area today and the induction machine, known for its legendary strength, could be an answer to this problem. However, a three-phase induction machine with three stator phases and six active switches, is unsatisfactory because it does not meet safety goals set. To overcome this problem for embedded applications, new work consists in designing a Six Phase Induction Machine (6PIM). The main advantage of this type of machine is essentially functioning in faulted mode, which corresponds to the loss of one or more supply phases. However, this critical situation induces torque ripples that affect significantly the quality of the task. The objective of this thesis is therefore to design nonlinear and intelligent algorithms which can operate in safe mode or in faulted mode. For this and after reviewing many nonlinear and intelligent control laws, we have focused our study on variable structure control and fuzzy logic control. Both techniques are known for their robustness and their low computation requirements. Both algorithms were used to achieve precise positioning regardless of the mechanical load driven and in the cases of phase losses. Note that these algorithms have been inserted into the inner and the external loop. After being compared with a conventional PID controller, these two intelligent algorithms have been successfully implemented on a test bed developed in the laboratory
Garg, Aditie. "Designing Reactive Power Control Rules for Smart Inverters using Machine Learning." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83558.
Full textMaster of Science
Williams, Matthew. "Investigation of machine vision and path planning methods for use in an autonomous unmanned air vehicle." Thesis, Bangor University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367393.
Full textPodzámsky, Ján. "Optimalizace uspořádání technologických pracovišť ve společnosti Slovarm." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230276.
Full textChong, Yew Chuan. "Thermal analysis and air flow modelling of electrical machines." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10466.
Full textFlake, John T. "Application of the Relevance Vector Machine to Canal Flow Prediction in the Sevier River Basin." DigitalCommons@USU, 2007. https://digitalcommons.usu.edu/etd/272.
Full textYusuf, Adeel. "Advanced machine learning models for online travel-time prediction on freeways." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50408.
Full textHsu, Pei-Lun. "Machine Learning-Based Data-Driven Traffic Flow Estimation from Mobile Data." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-300712.
Full textInformation om trafikflödet är nödvändig för övervakning av fordonsutsläpp och trafikstyrning. Trafikflöden kan dock inte observeras överallt och när som helst på vägen på grund av höga installationskostnader och t.ex. funktionsstörningar hos stationära sensorer. För att kompensera för stationära sensorers svagheter analyseras i detta arbete ett tillvägagångssätt för att estimera trafikflöden från mobila data som tillhandahålls av INRIX. Detta kommersiella dataset innehåller restider som kommer från användare av bl.a. färdnavigatorer i fordon och som har en bred rumslig täckning och hög kvalitet. Idén är att utveckla modeller baserade på artificiellt neuronnät för att automatiskt extrahera samband mellan trafikflödesdata och restidsdata från INRIX-mätningarna baserat på historiska data och med hänsyn till tidsmässiga och rumsliga beroenden. Vi utförde experiment med fyra veckors data från INRIX och från stationära sensorer på två intilliggande vägsegment på E4:an i Stockholm. Modellerna valideras med hjälp av estimering av trafikflöde baserat på en veckas INRIX- data. Jämfört med det traditionella tillvägagångssättet som anpassar stationära samband mellan trafikflöde och hastighet baserat på fundamentaldiagram, förbättrar det nya tillvägagångssättet noggrannheten avsevärt. Dessutom visar resultaten att modellerna i den nya metoden bättre hanterar avvikelser i ingående variabler och kan öka noggrannheten på estimatet för vägsegmentet utan stationär sensor. Den nya metoden kan därför vara lämplig för att uppskatta trafikflöden på vägsegment närliggande en stationär sensor. Metodiken ger ett automatiserat sätt att bygga modeller som är anpassade till datamängderna och som förbättrar noggrannheten vid estimering av trafikflöden. Den kan också enkelt integrera nya datakällor. Metodiken är lämplig att tillämpa på tillämpningar inom intelligenta transportsystem för trafikövervakning och trafikstyrning.
Silva, Luiz Otávio Lamardo Alves. "Classificação visual de mudas de plantas ornamentais: análise da eficácia de técnicas de seleção de atributos." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-04112014-105007/.
Full textThe automation of visual classification of products is gaining more importance in agricultural production processes. That said, one of the main difficulties encountered by ornamental plants and flowers producers is to ensure homogeneous growth of their plants. In this scenario, the seedlings used to grow the plants are very important since it is possible to estimate their growth potential by means of a visual inspection. Therefore, a computer vision system can be used to automate this task. Unlike traditional industries, the agricultural industry shows great variability among the products inspected. Supervised machine learning techniques can evaluate an attribute set representing the inspected object in order to correctly classify it, making it possible not only to deal with the variability of the inspected products but also with the incorporation of experts knowledge into the system. The definition of the attribute set to be extracted from the images of the products is of utmost importance, as it is it that provides all information used by the system. A set with several attributes ensures that all necessary information is captured; however irrelevant or redundant attributes can affect the performance of classifiers. Attribute selection techniques can be used to balance these needs. The aim of this study was then to evaluate the effectiveness of these techniques regarding the classification of African violet seedlings. Twenty- six parameters were extracted from six hundred images, labeled into four quality groups. Then, the performances of six classifiers were compared by considering the universe of subsets generated by four attribute selection techniques. The results showed that these techniques are indeed advantageous, generating gains of up to 8.8% in accuracy rate while reducing from 26 to 11 the average number of attributes used. Logistic Regression classifier, associated with the subset generated by the Chi-squared filter showed the best overall performance, achieving 80 % accuracy. Random Forest was second, but was less sensitive to attribute selection.
Barre, Pierre-Jean Hautier Jean-Paul. "Commande et entrainement des machines-outils à dynamique élevée formalismes et applications /." Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/161.
Full textN° d'ordre (Lille 1) : 441. Résumé en français. Curriculum vitae. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 126-127. Liste des publications et communications.
Ennassiri, Hamza. "Analyse magnéto-vibroacoustique des machines synchrones discoides à commutation de flux dédiées aux véhiculex électriques hybrides." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMLH36/document.
Full textThis PhD thesis deals with the issue of vibroacoustic emissions from the first design phases of electrical machines in order to have robust, reliable and above all efficient machines that meet the constraints in a wide range of applications and especially electrical vehicles. This manuscript is not only interested in the identification and highlighting the vibroacoustic problem, but above all to brought solutions and response elements to certain constraints. Knowing that the vibroacoustic problem is too vast and complex, this thesis focuses on vibroacoustic aspects of electromagnetic origin. To do so, the methods of noise reduction are presented but only the passive reduction solutions are used. These solutions are based on the design and optimization of efficient and less noisy electrical machines. This brings us back to the core of this work, which is the development of tools and multi-physics models combining the criteria of genericity, speed, accuracy and simplicity of coupling. In this context, several electric, magnetic, mechanical, thermal and acoustic models are presented. Different coupling strategies and modeling approaches are investigated. Conclusions are drawn each time according to the needs for the application use case
Kremer, Mickaël. "Electromagnetic design of a disc rotor electric machine as integrated motor-generator for hybrid vehicles." Thesis, Mulhouse, 2016. http://www.theses.fr/2016MULH8792/document.
Full textThis PhD presents the design of a disc rotor electric machine for the traction of hybrid vehicles. A complete state of the art enables the selection of the internal rotor axial flux machine which is the most suited to this application. Different geometries of the magnetic circuit are successively studied and compared with finite elements simulations. To maximize the efficiency of the machine losses generated in the magnetic circuit are studied. An analytic model on the skin effect in the copper conductors is proposed and validated with finite elements simulations. A second analytic model estimates the eddy current losses in the permanent magnets for every operating point of the machine based on only three finite element simulations enabling an important time-saving. Two dimensioning methods are compared: the manual dimensioning based on a tries/errors method and the multi-objectives optimization. This last method automates the dimensioning and enables a more refined optimization and a strong improvement of the performances. For example, the torque density has been improved by 29% in that case. The designed axial flux machine is compared to a state of the art radial flux machine for hybrid vehicle. This comparison shows the potential of the axial flux machine with an improvement of the torque density by more than 20%. Finally two prototypes have been built and measured to validate the simulations
Zheng, Yanming. "Minimizing Makespan for Hybrid Flowshops with Batch, Discrete Processing Machines and Arbitrary Job Sizes." FIU Digital Commons, 2010. http://digitalcommons.fiu.edu/etd/383.
Full textPaszek, Michal. "Analýza tepelných vlastností synchronního stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219717.
Full textSher, Galen. "News media, asset prices and capital flows: evidence from a small open economy." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25505.
Full textCurea, Octavian. "Recherche et validation des modèles de connaissances d'un ensemble convertisseur machine synchrone pour l'aide au diagnostic : conception d'une instrumentation virtuelle." Le Havre, 2001. http://www.theses.fr/2002LEHA0008.
Full textResearch of the methods and models usable for fault detection on tree phases motor systems. In order to verify the pertinence of the procedures used, tree fault classes have been studied : control (asymmetrical sequences), mechanical (variable load torque), and electrical (phase resistance variation) fault classes
Baghli, Lotfi. "Contribution à la commande de la machine asynchrone, utilisation de la logique floue, des réseaux de neurones et des algorithmes génétiques." Phd thesis, Université Henri Poincaré - Nancy I, 1999. http://tel.archives-ouvertes.fr/tel-00356891.
Full textHail, Nourredine. "Méthodes algorithmiques pour les lignes de production avec des machines parallèles." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10019.
Full textAhmed, Zubair. "Developing an efficient scheduling template of a chemotherapy treatment unit: simulation and optimization approach." Australasian Medical Journal, 2011. http://hdl.handle.net/1993/5084.
Full textOzlen, Melih. "A Bicriteria Rescheduling Problem On Unrelated Parallel Machines: Network Flow And Enumeration Based Approaches." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607822/index.pdf.
Full textHrabinová, Barbora. "Vytvoření předpovědi průměrných měsíčních průtoků pro řízení zásobní funkce fiktivní vodní nádrže." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372103.
Full textElkosantini, Sabeur. "Contribution à la modélisation de la dynamique du comportement d'opérateurs humains." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2007. http://tel.archives-ouvertes.fr/tel-00369774.
Full textLes hypothèses proposées dans le modèle sont par la suite testées dans un environnement de simulation permettant de reproduire une tâche de contrôle de la qualité de certains produits dans un atelier de production. Les résultats des expériences obtenus ont été utilisés pour la construction d'un modèle de comportement.
Espinouse, Marie-Laure. "Flowshop et extensions : chevauchement des tâches, indisponibilité des machines et système de transport." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10247.
Full textKiourktsidis, Ilias. "Flexible cross layer design for improved quality of service in MANETs." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/7464.
Full textSoualmi, Boussaad. "Coopération Homme Machine pour la conduite automatisée : une approche par partage haptique du contrôle." Thesis, Valenciennes, 2014. http://www.theses.fr/2014VALE0007/document.
Full textThe work presented in the thesis is part of the research partnership project ANRABV 2009 which aims is to design an automated low-speed driving. It describes and analyzes the principles of shared control of a motor vehicle between a human driver and an electronic copilot (E-copilot). The objective is to establish effective human-machine cooperation between the driver and E-copilot. One issue is particular to allow the driver to interact with the E-copilot continuously in order to perform maneuvers he wants without requiring deactivation neither constrained by E-copilot. This issue addresses the need for consideration of driver actions taken to remedy those of E-copilot for example avoiding undetected obstacle by the system while ensuring operator comfort and the driver situation awareness. The driver and E-co-pilot acting simultaneously on the steering system, everyone must be aware of the actions of the other: twoway communication is essential. To achieve this goal, we used the haptic interactions through the steering system of the vehicle. The torque applied by the driver on the steering wheel is used by the E-copilot to take into account these actions as the torque produced by the E-copilot is felt by the driver and used to understand the system’s behavior. Other key issues for the Human-Machine Cooperation were also discussed: the study of changes in modes of operation of the system and HMI via which the driver interact with the system
Harbaoui, Houda. "Ordonnancement d’un système de production industriel complexe : flow shop hybride avec des machines dédiées soumis à différentes contraintes temporelles." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2018. http://www.theses.fr/2018IMTA0114/document.
Full textIncreasing profits, through the improvement of productivity and minimizing waste, is a primary objective for industrial companies. In this thesis, we are interested insolving a real complex industrial problem with time constraints. Firstly, we were interested in minimizing completion time (Cmax). Secondly, we focused on minimizing of non-recyclable waste. As a first step, we formulated the problem by mathematical models, which we solved using a solver. In a second step, we proposed an approximate method in the form of evolutionary algorithms. Both methods were applied to the two objectives mentioned above separately. Then, a third method which is a tree-search algorithm was applied only to the main objective. We tested the proposed algorithms on instances inspired from a real case; from an agri-food business, and also on instances inspired from the literature
Hussain, Ayman. "Contribution à la commande adaptative robuste par modes glissants." Reims, 2008. http://theses.univ-reims.fr/exl-doc/GED00000994.pdf.
Full textThis thesis aims to develop a family of adaptive robust sliding modes for a large class of non-linear uncertain and disturbed. Two control laws were developed. In the first, the model system has been reformed such that all the unknown dynamics are combined in one function and then use a single approximation. In this context, fuzzy wavelet networks were first used thanks to their rapid convergence but they don’t give good results in the presence of uncertain linguistic information. To resolve this, a fuzzy system of type-2 was used. To ensure robustness against external disturbances, uncertainty and approximation errors, the sliding mode has been proposed. To reduce the stresses at the start of the signal, a non-linear was introduced. The control law is built to ensure the robustness and overall stability of the closed system in addition to it’s capacity of eliminating the phenomenon of chattering in the case of classical sliding mode. However, the choice of the gains of the sliding surface becomes complicated for systems of order greater than 2. To overcome this problem, a new control law using sliding mode has been proposed. The main advantage of this approach is that the sliding surface has been modified so that the approach has been removed which makes the system more robust and increases its speed of convergence to the reference signal. .
Chomier, Mickael Thierry. "Effect of Vortex Roll-up and Crevice Mass Flow on Ignition in a Rapid Compression Machine." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1374666527.
Full textCornejo, Maceda Guy Y. "Gradient-enriched machine learning control exemplified for shear flows in simulations and experiments." Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPAST036.
Full textAs main contribution we propose a fast and automated gradient-enriched machine learning control (gMLC) algorithm to learn feedback control laws. The framework alternates between explorative and exploitive gradient-based iterations, generalizing genetic programming control (GPC) and the Explorative Gradient Method (EGM). The gMLC algorithm has been demonstrated both numerically, with the stabilization of a MIMO system, the fluidic pinball and experimentally, with the control of the open cavity. In both cases, gMLC successfully built closed-loop control laws allowing the best performances so far. We prove, in particular, that the mechanisms behind the control of the cavity rely effectively on feedback. The benchmark of gMLC with GPC on both problems, shows that gMLC outperforms GPC both in terms of convergence speed and final solution efficiency. An acceleration of at least a factor 10 between the GPC and gMLC has been achieved, allowing the control of many experiments, e.g., with a large number of inputs and outputs or multiple parameters testing for robustness. The two developed codes are both freely available online: xMLC, based on GPC and gMLC, based on our new algorithm
Hissel, Daniel. "Contribution à la commande de dispositifs électrotechniques par logique floue : procédures de réglage sur site par plans d'expériences et méthodologie Taguchi : application à un hacheur dévolteur et à une machine asynchrone." Toulouse, INPT, 1998. http://www.theses.fr/1998INPT037H.
Full textEl, Siblani Ali. "Tool condition analysis and monitoring in cold rolling process." Thesis, KTH, Industriell produktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41318.
Full textJohansson, Henrik. "Video Flow Classification : Feature Based Classification Using the Tree-based Approach." Thesis, Karlstads universitet, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-43012.
Full textHITS, 4707
Fayed, Hassan El-Hady Hassan. "Particles and Bubbles Collisions Frequency in Homogeneous Turbulence and Applications to Minerals Flotation Machines." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/24910.
Full textPh. D.