Le sujet de thèse de doctorat s’inscrit dans le cadre d’un projet de recherche collaboratif entre l’Institut FEMTO-ST et le groupe SAFRAN/SNECMA. Une partie des travaux de cette thèse concerne les caractérisations thermo-physiques de polymères chargés pour différentes nuances et granulométries de poudres de superalliage destinés à être mis en forme par le procédé de Moulage par Injection de Poudre. Pour ces travaux de thèse de doctorat, trois nuances de polymères chargés composé de poudres de superalliages ont été investiguées. Deux nuances sont composées de poudres utilisées par Snecma en réparation (René 80®/Amdry D15® et RBD61) et un autre est composée de poudre d’Inconel 718. Différentes caractérisations ont été réalisées et ont permis d’optimiser le développement de mélanges chargés conduisant à l’élaboration de matériaux homogènes et injectables tout en possédant des taux de charge en poudres les plus élevés possible.Les résultats de ces travaux sont ensuite utilisés afin d’identifier différents termes présents dans les modèles analytiques de rhéologie usuels. Le développement de modèles de rhéologies spécifiques a été réalisé en incorporant aux lois rhéologiques usuelles différents termes dépendant de la surface spécifique, de la viscosité des liants employés au sein de la formulation. Le développement de ces modèles de viscosité de plus en plus complets permet d’améliorer les lois de comportements et de mieux décrire le comportement rhéologique de polymères chargés. Enfin, une simulation de l’étape de moulage par injection d’un composant aéronautique a été réalisée à l’aide du logiciel Moldflow© pour la nuance de René 80®/Amdry D15®. / The works presented in this paper were realized in collaboration between the mechanical department of FEMTO-ST Institute and the company SAFRAN/SNECMA. A part of the works of this thesis focused the thermo-physical characterizations of loaded polymers that is mixtures based of thermoplastic binders and metallic powders suitable be shaped by powder injection molding process.For this work, three different loaded mixtures composed of superalloy powder were investigated.Two were supplied by SAFRAN/SNECMA used to repair (Rene80®/AmdryD15® and RBD61) and another is composed of Inconel 718 powder. Characterizations were to carry out to optimize the development of loaded polymers and to obtain homogenous materials with high solid fraction. Then, the data were used to identified parameters of usual rheological laws. The development of specific rheological models were realized by including different parameters related to the specific surface area, binder viscosities used in the formulation. The development of these models increasingly exhaustive allows the improvement of behavior laws and to better describe the rheological behavior of superalloy-loaded polymers. Finally, a simulation of the injection molding stage of a aeronautical component was realized in the Moldflow© software for the Rene80®/AmdryD15® loaded polymer.

Doctor of Philosophy / Department of Electrical and Computer Engineering / James E. DeVault / Prakash Krishnaswami / Most state-of-the-art systems are multidisciplinary in nature and encompass a wide range of components from domains such as electronics, mechanics, hydraulics, etc. Design considerations and design parameters of the system can come from any or a combination of these domains. The traditional optimization approach for multidisciplinary systems utilizes sequential optimization, wherein each subsystem is optimized in isolation in a predetermined order, assuming that the designs of the other subsystems remain fixed. This often leads to system designs that are suboptimal. In recent years emphasis has been placed on development of an integrated scheme for analysis and design of multidisciplinary systems. An important aspect is the software architecture required to support such a scheme. This dissertation presents MIXEDMODELS (Multidisciplinary Integrated eXtensible Engine for Driving Metamodeling, Optimization and DEsign of Large-scale Systems) - a unified analysis and design tool for multidisciplinary systems that is based on a procedural, symbolic-numeric architecture. This architecture offers great modeling flexibility at the component level, allowing any engineer to add components in his/her domain of expertise to the platform in a modular fashion. The symbolic engine in the MIXEDMODELS platform synthesizes the system governing equations as a unified set of nonlinear differential-algebraic equations (DAEs). These equations are differentiated with respect to design variables to obtain an additional set of DAEs that describe the sensitivity coefficients of the system state variables. This combined set of DAEs is solved numerically to obtain the solution for the state variables and the state sensitivity coefficients of the system. Finally, knowing the system performance functions, their design sensitivity coefficients can be calculated by using the values of the state variables and state sensitivity coefficients obtained from the DAEs. For ease in error control and software implementation, sensitivity analysis formulation described in this work uses direct differentiation approach as opposed to the adjoint variable approach. The MIXEDMODELS capabilities are demonstrated through several numerical examples and the results indicate that the MIXEDMODELS formulation and architecture is effective in terms of accuracy, modeling convenience, computational efficiency, and the ability to simulate the behavior of a general class of multidisciplinary systems.

Le travail de cette thèse se focalise sur le rôle de l’espace de la représentation comme un univers d’actions pour conduire la conception et l’aboutissement du projet d’aménagement et d’architecture. Il vise à renouveler les questions sur la scène actuelle de la pratique professionnelle au regard de la mutation permanente des outils de la visualisation mis en pratique. L’approche proposée par cette thèse est d’ordre systémique-compréhensive et tente de tisser des liens entre la nature de la pratique de la conception comme pratique basée de plus en plus sur des démarches collaboratives et la nature des dispositifs numériques comme univers fondés sur l’interactivité et la virtualité. Le premier univers est attaché au facteur humain, aux relations entre le praticien, son statut professionnel et les acteurs du projet ; le deuxième a pour entité l’idéalisation et l’artificialité du système numérique conçu pour répondre aux pratiques. Entre ces deux univers se place le modèle de l’utilisation, comme modèle invisible qui se forme par la conjonction entre une culture du projet et une culture numérique. Trois approches guident l’enquête ethnographique menée auprès des praticiens : une approche par l’« architecte-agence » comme entité qui a tendance à forger une identité professionnelle par la « production » et par le développement de compétences adaptées à la mutation de la profession ; une approche par le « projet » qui le présente comme environnement « organisateur » conditionnant le travail et le déroulement de la conception ; et une dernière approche par l’« appropriation » de la 3D comme phénomène que nous avons visé à identifier dès le démarrage de nos recherches. / This thesis focuses on the role of the environment of the representation, as an important sphere which leads the conception, and the development of architectural project. It aims to analyze the actual professional practice, and also the permanent evolution of the displayed tools used in these domains. The approach proposed by this thesis is based on a systematic-comprehensive matter, this approach try to develop links between the conception (as a first universe based on a collaboration between partners) and a second universe of numeric tools (marked by the interactivity and the vitality). The conception universe is attached to the human factor, to the relations between the practitioner, its professional status and the actors of the project, however the numeric environment presents a second universe based on the idealization and the artificiality of the digital system. The model of the use takes place between these two universes, as an invisible model which forms by the conjunction between a project’s culture and a numerical culture. Three approaches guide the ethnographical analyses realized with the practitioners: the first approach presents the “architect-agency” which develops a professional identity based on the “production” and on the development of adapted specific skills; the second approach concerns “the project” which is presented like a sphere influencing the work and the progress of the conception; the third and last approach is the use of 3D conception as a phenomenon which we aimed to identify in our research.

This thesis deals with the design system for multiple integrals for diferential expression with space variables. Today, integration is one of engineering problems. Reader is acquainted with different method of integration, then with numerican integration and Taylor series. The practical aim of this work is to design software and hardware system of numerican integration multiple integrals.

This term project describes transformation of system of diferential equations into polynomial form. Such transformed systems of diferential equations can be subsequently solved using Taylor series. This method enables computing of initial problem's numeric solution using dynamical order selection in order to achieve required accuracy. The work mathematically proves, that transformed systems of diferential equations have the same solution as the original systems. This transformation can be used for all mathematic functions commonly used in technical applications. The work also focuses on optimization of given problem and implements it in programme taylor. This progamme enables user to solve given diferential equations with chosen parameters.

The aim of diploma thesis is to design one variant of technical flood protection in the urban area of the town of Litovel. The subject of the work is the elaboration of the so called "zero variant", consisting in the transfer of part of the flood flows through the Morava riverbed in km 259,852 - 262,070 and the Power Plant drive in km 0.000 - 1.791. Hydraulic calculations were carried out using a 1D numerical model. The outputs have been processed in the form of project documentation of flood protection.

A diploma thesis was objected to a figure analyzing and a figure interpretation of ingot processing. The described figures were obtained from samples which were taking from feeder-heads of ingot of lower ram, produced in Vitkovice Machinery Group. The thesis was focused on ingot solidification and segregation processes which were associated with this procedure. The figures obtained from numeric simulation of ingot solidification in defined places were analyzed using statistic method – linear regression, as well as linear regression was used for evaluation of explored samples, their chemical compositions and mechanical properties. In conclusion all acquired results were summarized.

No description available.

A huge amount of data is generated daily by digital technologies such as social media, web logs, traffic sensors, on-line transactions, tracking data, videos, and so on. This has led to the archiving and storage of larger and larger datasets, many of which are multi-modal, or contain different types of data which contribute to the problem that is now known as “Big Data”. In the area of Big Data, volume, variety and velocity problems remain difficult to solve. The work presented in this thesis focuses on the variety aspect of Big Data. For example, data can come in various and mixed formats for the same feature(attribute) or different features and can be identified mainly by one of the following data types: real-valued, crisp and linguistic values. The increasing variety and ambiguity of such data are particularly challenging to process and to build accurate machine learning models. Therefore, data heterogeneity requires new methods of analysis and modelling techniques to enable useful information extraction and the modelling of achievable tasks. In this thesis, new approaches are proposed for handling heterogeneous Big Data. these include two techniques for filtering heterogeneous data objects are proposed. The two techniques called Two-Dimensional Similarity Space(2DSS) for data described by numeric and categorical features, and Three-Dimensional Similarity Space(3DSS) for real-valued, crisp and linguistic data are proposed for filtering such data. Both filtering techniques are used in this research to reduce the noise from the initial dataset and make the dataset more homogeneous. Furthermore, a new similarity measure based on intuitionistic fuzzy set theory is proposed. The proposed measure is used to handle the heterogeneity and ambiguity within crisp and linguistic data. In addition, new combine similarity models are proposed which allow for a comparison between the heterogeneous data objects represented by a combination of crisp and linguistic values. Diverse examples are used to illustrate and discuss the efficiency of the proposed similarity models. The thesis also presents modification of the k-Nearest Neighbour classifier, called k-Nearest Neighbour Weighted Average (k-NNWA), to classify the heterogeneous dataset described by real-valued, crisp and linguistic data. Finally, the thesis also introduces a novel classification model, called FCCM (Filter Combined Classification Model), for heterogeneous data classification. The proposed model combines the advantages of the 3DSS and k-NNWA classifier and outperforms the latter algorithm. All the proposed models and techniques have been applied to weather datasets and evaluated using accuracy, Fscore and ROC area measures. The experiments revealed that the proposed filtering techniques are an efficient approach for removing noise from heterogeneous data and improving the performance of classification models. Moreover, the experiments showed that the proposed similarity measure for intuitionistic fuzzy data is capable of handling the fuzziness of heterogeneous data and the intuitionistic fuzzy set theory offers some promise in solving some Big Data problems by handling the uncertainties, and the heterogeneity of the data.

Syftet med denna masterstudie var att jämföra den smärtlindrande effekten av fullständig utrensning och desinfektion av rotkanalsystemet med enbart utrymning av pulpakavum, utan instrumentering av rotkanalerna, som akutbehandling hos tänder med symtomatisk apikal parodontit. Materialet utgjordes av 16 patienter insamlade på Tandvårdshögskolans jourmottagning. Patienter med svullnad och allmänpåverkan exkluderades. Patienterna valdes slumpmässigt ut till att genomgå någon av behandlingarna. Den preoperativa smärtnivån och ev. analgetikaintag registrerades. Tre till fem dagar efter utförd behandling kontaktades patienterna per telefon och fick då gradera sin postoperativa smärtnivå samt analgetika- och/eller antibiotikaintag. Resultatet visade att 100% av patienterna som behandlades med fullständig utrensning erhöll tillfredställande smärtlindring jämfört med 71% av de patienter som behandlades med enbart utrymning av pulpakavum. Skillnaden var inte statistiskt signifikant. 44% av patienterna som behandlades med fullständig utrensning hade tagit smärtstillande postoperativt medan 29% av patienterna i utrymningsgruppen hade gjort det. Skillnaden var inte signifikant. Ingen av patienterna oavsett behandling hade tagit antibiotika efter behandlingen. Ingen skillnad förelåg i andelen patienter som blev tillräckligt smärtlindrade mellan fullständig utrensning och enbart utrymning av pulpakavum hos tänder med symtomatisk apikal parodontit. Det var inte heller någon skillnad i smärtsänkning mellan de två behandlingarna. / The aim was to compare the pain relieving effect of complete chemo mechanical disinfection of the root canal system with removal of necrotic tissue in the pulp chamber without instrumentation of the root canals as emergency treatment in teeth with symptomatic apical periodontitis. The material consisted of 16 patients collected at the emergency clinic at Malmö University. Patients with swelling and/or systemic involvement were excluded. The patients were randomized to either treatment. The preoperative pain level and intake of analgesics was registered. Three till 5 days postoperatively the patients were contacted and asked to grade the current pain level and intake of analgesics and/or antibiotics. The results showed that 100% of the patients treated with complete chemo mechanical disinfection of the root canal system obtained satisfying pain relief compared to 71% for patients treated with removal of necrotic tissue in the pulp chamber. 44% of the patients treated with chemo mechanical disinfection of the root canal system had some kind of analgesics postoperatively compared to 29% for those treated with removal of necrotic tissue in the pulp chamber. No patients in either group reported use of antibiotics postoperatively. The conclusion was that both complete chemo mechanical disinfection and removal of necrotic tissue implied a significant pain relief as emergency treatment in teeth with symptomatic apical periodontitis. There was no difference between the two treatments concerning the number of patients who obtained sufficient pain relief or in pain relieving effect.