Tesis sobre el tema "Multi-scale design"
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Suberu, Bolaji A. "Multi-scale Composite Materials with Increased Design Limits". University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377868507.
Texto completoHari, Bost Jan. "Multi-Scale Modelling, Simulation, Design and Analysis of Microreactors". Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511850.
Texto completoHolcombe, Evan W. "Multi-Scale Approach to Design Sustainable Asphalt Paving Materials". Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1493805362392927.
Texto completoFerrer, Ferré Àlex. "Multi-scale topological design of structural materials : an integrated approach". Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/406354.
Texto completoAquest treball té com a objectiu abordar els problemes d'optimització de topologia de múltiples escales. Amb aquesta finalitat, es consideren els conceptes de derivada topologia junt amb el mètode d'homogeneïtzació computacional. En aquest estudi, es presenta primer les condicions d'optimalitat i l'algorisme d'optimització utilitzat quan es considera la derivada topològica. A continuació, es proposa un tractament més precís dels elements de la interfície per reduir les inestabilitats numèriques i els elevats càlculs computacionals que apareixen quan s'utilitza l'algorisme de la derivada topològica. L'estratègia resultant s'examina i es compara amb les metodologies actuals, que es poden trobar sovint recollides a la literatura, mitjançant algunes proves numèriques. A més, s'obté una fórmula tancada de la derivada topològica anisotròpica quan es resol analíticament el problema exterior d'elasticitat. Per aconseguir-ho, es considera la teoria de variable complexa i la computació simbòlica. L'expressió resultant es valida a través d'algunes proves numèriques. A més, es resolen diferents problemes d'optimització topològica anisotròpica per mostrar les implicacions de la topològica macroscòpica en considerar materials anisòtrops. Finalment, s'aborda els problemes d'optimització topològica de dues escales. Com a primera estratègia, es considera les topologies microestructurals com a variables de disseny del problema per obtenir un augment de la rigidesa de l'estructura. Es proposa un algoritme de direcció alternada per fer front a les altes no linealitats del problema. A més, per mitigar els elevats càlculs computacionals, es presenta una tècnica de reducció per mitjà d'un precalcul de les topologies microestructural òptimes, que posteriorment són recollides en un catàleg de material. Com a una extensió de la primera estratègia, a més del disseny de les topologies microestructurals, la topologia macroscòpica també es considera com una variable de disseny, obtenint així solucions encara més òptimes. A més, els algoritmes proposats es modifiquen per tal d'obtenir dissenys que poden ser posteriorment fabricats. Alguns exemples numèrics d'optimització topològica de dues escales mostren el potencial de la metodologia proposada.
Kalua, Amos. "Framework for Integrated Multi-Scale CFD Simulations in Architectural Design". Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/105013.
Texto completoDoctor of Philosophy
The use of natural ventilation strategies in building design has been identified as one viable pathway toward minimizing energy consumption in buildings. Natural ventilation can also reduce the prevalence of the Sick Building Syndrome (SBS) and enhance the productivity of building occupants. This research study sought to develop a framework that can improve the usage of Computational Fluid Dynamics (CFD) analyses in the architectural design process for purposes of enhancing the efficiency of natural ventilation strategies in buildings. CFD is a branch of computational physics that studies the behaviour of fluids as they move from one point to another. The usage of CFD analyses in architectural design requires the input of wind environment data such as direction and velocity. Presently, this data is obtained from a weather station and there is an assumption that this data remains the same even for a building site located at a considerable distance away from the weather station. This potentially compromises the accuracy of the CFD analyses as studies have shown that due to a number of factors such the urban built form, vegetation, terrain and others, the wind environment is bound to vary from one point to another. This study sought to develop a framework that quantifies this variation and provides a way for translating the wind data obtained from a weather station to data that more accurately characterizes a local building site. With this accurate site wind data, the CFD analyses can then provide more meaningful insights into the use of natural ventilation in the process of architectural design. This newly developed framework was deployed on a study site at Virginia Tech. The findings showed that the framework was able to demonstrate that the wind flow field varies from one place to another and it also provided a way to capture this variation, ultimately, generating a wind flow field characterization that was more representative of the local conditions.
Koop, Matthew J. "High-Performance Multi-Transport MPI Design for Ultra-Scale InfiniBand Clusters". The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243581928.
Texto completoSong, Huaguang. "Multi-scale data sketching for large data analysis and visualization". Scholarly Commons, 2012. https://scholarlycommons.pacific.edu/uop_etds/832.
Texto completoZentner, John Marc. "A Design Space Exploration Process for Large Scale, Multi-Objective Computer Simulations". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11572.
Texto completoSamadiani, Emad. "Energy efficient thermal management of data centers via open multi-scale design". Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37218.
Texto completoCrowe, Robert A. "Design, construction and testing of a reduced-scale cascaded multi-level converter". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FCrowe.pdf.
Texto completoThesis advisor(s): Robert W. Ashton, John G. Ciezki, Douglas J. Fouts. Includes bibliographical references (p. 125-126). Also available online.
Morin, Jeffrey W. (Jeffrey William). "Design, fabrication and mechanical optimization of multi-scale anisotropic feet for terrestrial locomotion". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65314.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 67-69).
Multi-scale surface interaction methods have been studied to achieve optimal locomotion over surface features of differing length scales. It has been shown that anisotropy is a convenient way of transferring an undirected force to a preferred direction or movement. In this thesis, the fundamentals of friction were studied to achieve a better understanding of how to design multi-scaled robotic feet that use anisotropy for terrestrial locomotion. Static and kinetic friction coefficients were found for novel test geometries under varying load conditions. The test geometries were manufactured with materials of variable durometer and were tested using unconventional rheometry methodology. Test results were then compared to standard friction laws. As predicted, the effects of contact area were shown to have an effect on the friction forces experienced by the softer materials. The contact area effects were then modeled as Hertzian contacts for a given material. Verification of the area dependencies for the materials with adhesive effects was performed for the samples used in the friction tests. The samples were subjected to varying compressive force and images of the corresponding contact areas were obtained using an inverted microscope. The microscope images were then processed using MATLAB's image processing toolbox to find the actual contact area for the samples. The contact area results were shown to be in accordance with Herztian contact principles. The effects of varying surface roughness were also studied for a given anisotropic arrangement of bristles. The array of bristles was used to provide propulsion to a controllable robot called BristleBot. The untethered nature of the robot allowed for unhindered velocity and force measurements that were used to analyze the effects of surface roughness. The force input for the robot was provided by two vibration motors that created an excitation which was then translated to horizontal movement by the anisotropic formation of the bristles. It was found that the BristleBot was able to achieve optimal locomotion when roughness conditions were minimized. Results of the anisotropic friction and adhesion tests were used to improve footpad development for soft robotic platforms.
by Jeffrey W. Morin.
S.M.
Tartibu, Lagouge K. "A multi-objective optimisation approach for small-scale standing wave thermoacoustic coolers design". Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1307.
Texto completoThermoacoustic heat engines provide a practical solution to the problem of heat management where heat can be pumped or spot cooling can be induced. This is new among emerging technology with a strong potential towards the development of sustainable and renewable energy systems by utilising solar energy or wasted heat. The most inhibiting characteristic of current thermoacoustic cooling devices is the lack of efficiency. Although simple to fabricate, the designing of thermoacoustic coolers involves significant technical challenges. The stack has been identified as the heart of the device where the heat transfer takes place. Improving its performance will make thermoacoustic technology more attractive. Existing efforts have not taken thermal losses to the surroundings into account in the derivation of the models. Although thermal losses can be neglected for large-scale applications, these losses need to be adequately covered for small-scale applications. This work explores the use of a multi-objective optimisation approach to model and to optimise the performance of a simple thermoacoustic engine. This study aims to optimise its geometrical parameters—namely the stack length, the stack height, the stack position, the number of channels and the plate spacing—involved in designing thermoacoustic engines. System parameters and constraints that capture the underlying thermoacoustic dynamics have been used to define the models. Acoustic work, viscous loss, conductive heat loss, convective heat loss and radiative heat loss have been used to measure the performance of the thermoacoustic engine. The optimisation task is formulated as a five-criterion mixed-integer nonlinear programming problem. Since we optimise multiple objectives simultaneously, each objective component has been given a weighting factor to provide appropriate user-defined emphasis. A practical example is provided to illustrate the approach. We have determined a design statement of a stack describing how the design would change if emphasis is placed on one objective in particular. We also considered optimisation of multiple objective components simultaneously and identified global optimal solutions describing the stack geometry using the augmented ε-constraint method. This approach has been implemented in GAMS (General Algebraic Modelling System). In addition, this work develops a novel mathematical programming model to optimise the performance of a simple thermoacoustic refrigerator. This study aims to optimise its geometrical parameters—namely the stack position, the stack length, the blockage ratio and the plate spacing—involved in designing thermoacoustic refrigerators. System parameters and constraints that capture the underlying thermoacoustic dynamics have been used to define the models. The cooling load, the coefficient of performance and the acoustic power loss have been used to measure the performance of the device. The optimisation task is formulated as a three-criterion nonlinear programming problem with discontinuous derivatives (DNLPs). Since we optimise multiple objectives simultaneously, each objective component has been given a weighting factor to provide appropriate user-defined emphasis. A practical example is provided to illustrate the approach. We have determined a design statement of a stack describing how the geometrical parameters described would change if emphasis is placed on one objective in particular. We also considered optimisation of multiple objective components simultaneously and identified global optimal solutions describing the stack geometry using a lexicographic multi-objective optimisation scheme. The unique feature of the present mathematical programming approach is to compute the stack geometrical parameters describing thermoacoustic refrigerators for maximum cooling or maximum coefficient of performance. The present study highlights the importance of thermal losses in the modelling of small-scale thermoacoustic engines using a multi-objective approach. The proposed modelling approach for thermoacoustic engines provides a fast estimate of the geometry and position of the stack for maximum performance of the device. The use of a lexicographic method introduced in this study improves the modelling and the computation of optimal solutions and avoids subjectivity in aggregation of weight to objective functions in the formulation of mathematical models. The unique characteristic of this research is the computing of all efficient non dominated Pareto optimal solutions allowing the decision maker to select the most efficient solution. The present research experimentally examines the influence of the stack geometry and position on the performance of thermoacoustic engines and thermoacoustic refrigerators. Thirty-six different cordierite honeycomb ceramic stacks are studied in this research. The influence of the geometry and the stack position has been investigated. The temperature difference across the stack and radiated sound pressure level at steady state are considered indicators of the performance of the devices. The general trends of the proposed mathematical programming approach results show satisfactory agreement with the experiment. One important aspect revealed by this study is that geometrical parameters are interdependent and can be treated as such when optimising the device to achieve its highest performance. The outcome of this research has direct application in the search for efficient stack configurations of small-scale thermoacoustic devices for electronics cooling.
Delucia, Marco. "Développement de modèles multi-échelle et multi-physiques pour la conception de composites à base de liège". Thesis, Paris, HESAM, 2022. http://www.theses.fr/2022HESAE036.
Texto completoThis thesis focuses on the development of multi-scale and multi-physical models of the cork agglomerate with the aim of developing a first contribution to characterise the behaviour of cork-based composites. This work contributes to the development of new design methods based on systematic approaches. The thesis’s work is focused on white agglomerates. A first 2D numerical model of the agglomerate at the mesoscopic scale has been developed in order to understand the local thermomechanical behaviour of cork granules. This made it possible to study the influence of some design parameters on the thermoelastic properties of the agglomerate at the macroscopic scale. Following this first work, the 2D numerical model of the agglomerate has been generalised and a new 3D numerical model has been proposed. A homogensation strategy, based on a stochastic approach, has been introduced to study the influence of the variability of the elastic properties of natural cork on the elastic properties of the agglomerate as a function of temperature. The results obtained thanks to these works can be useful for the design of the agglomerate by the trial/error method. Finally, the pre-stress state into the agglomerate, made by the compression moulding, has been evaluated by means of the simulation of the compression process. The proposed approach is based on a simulation of the mould filling phase followed by a compression phase. The time dependent stress-strain curves of the granulate, at different strain states, represent a first useful result as input data in a design approach that takes into account the effects of manufacturing process
Abdelaziz, Omar Abdelaziz Ahmed. "Development of multi-scale, multi-physics, analysis capability and its application to novel heat exchanger design and optimizaiton". College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9566.
Texto completoThesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Gomez, Connie Sun Wei Shokoufandeh Ali. "A unit cell based multi-scale modeling and design approach for tissue engineered scaffolds /". Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1766.
Texto completoSuwanpinij, Piyada [Verfasser]. "Multi-scale modelling of hot rolled dual-phase steels for process design / Piyada Suwanpinij". Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1030517010/34.
Texto completoReichl, John Vincent. "Design Optimization of Hybrid Switch Soft-Switching Inverters using Multi-Scale Electro-Thermal Simulation". Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/64169.
Texto completoPh. D.
Becar, Joseph Samuel. "A Collaborative Conceptual Aircraft Design Environment for the Design of Small-Scale UAVs in a Multi-University Setting". BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5857.
Texto completoDasiyici, Mehmet Celal. "Multi-Scale Cursor: Optimizing Mouse Interaction for Large Personal Workspaces". Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/32706.
Texto completoMaster of Science
Escamez, Guillaume. "AC losses in superconductors : a multi-scale approach for the design of high current cables". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT087/document.
Texto completoThe work reported in this PhD deals with AC losses in superconducting material for large scale applications such as cables or magnets. Numerical models involving FEM and integral methods have been developed to solve the time transient electromagnetic distributions of field and current density with the peculiarity of the superconducting constitutive E-J equation. Two main conductors have been investigated for two ranges of superconducting cables. First, REBCO superconductors working at 77 K are studied and a new architecture of conductor (round wires) for 3~kA cables. Secondly, for very high current cables, 3-D simulations on MgB2 wires are approach and solved using FEM modeling. The following chapter introduced new development used for the calculation of AC losses in DC cables. The thesis ends with the use of the developed numerical model on a practical example in the BEST-PATHS project: a 10 kA MgB2 demonstrator
Duro, Royo Jorge. "Towards Fabrication Information Modeling (FIM) : workflow and methods for multi-scale trans-disciplinary informed design". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101843.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 67-70).
This thesis sets the stage for Fabrication Information Modeling (FIM); a design approach for enabling seamless design-to-production workflows that can derive complex designs fusing advanced digital design technologies associated with analysis, engineering and manufacturing. Present day digital fabrication platforms enable the design and construction of high-resolution and complex material distribution structures. However, virtual-to-physical workflows and their associated software environments are yet to incorporate such capabilities. As preliminary methods towards FIM I have developed four computational strategies for the design and digital construction of custom systems. These methods are presented in this thesis in the context of specific design challenges and include a biologically driven fiber construction algorithm; an anatomically driven shell-to-wearable translation protocol; an environmentally-driven swarm printing system; and a manufacturing-driven hierarchical fabrication platform. I discuss and analyze these four challenges in terms of their capabilities to integrate design across media, disciplines and scales through the concepts of multidimensionality, media-informed computation and trans-disciplinary data in advanced digital design workflows. With FIM I aim to contribute to the field of digital design and fabrication by enabling feedback workflows where materials are designed rather than selected; where the question of how information is passed across spatiotemporal scales is central to design generation itself; where modeling at each level of resolution and representation is based on various methods and carried out by various media or agents within a single environment; and finally, where virtual and physical considerations coexist as equals.
by Jorge Duro Royo.
S.M.
Sharma, Roopali. "Design of a pixel scale sample-and-hold circuit suitable for integration in multi-technology FPGA". Cincinnati, Ohio : University of Cincinnati, 2006. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1141328237.
Texto completoTitle from electronic thesis title page (viewed Apr. 18, 2006). Includes abstract. Keywords: Photodetector, Sample and Hold Circuit, Multi-technology Devices. Includes bibliographical references.
PATEL, PRERNA D. "DESIGN OF A PIXEL SCALE OPTICAL POWER METER SUITABLE FOR INCORPORATION IN A MULTI-TECHNOLOGY FPGA". University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1066421274.
Texto completoNavarro, Rosa Jennifer. "Framework for sustainability assessment of industrial processes with multi-scale technology at design level: microcapsules production process". Doctoral thesis, Universitat Rovira i Virgili, 2009. http://hdl.handle.net/10803/8572.
Texto completoEn un mundo con recursos limitados y graves impactos ambientales, sociales y económicos, un estilo de vida más sostenible es cada día más importante. Debido a esto, el objetivo general de este trabajo es desarrollar un procedimiento metodológico para evaluar eco-eficiencia y sostenibilidad de procesos industriales con tecnología multi-escala a nivel de diseño. La metodología desarrollada sigue la serie ISO 14040 para el medio ambiente. Se utilizó el proceso analítico jerárquico para integrar los tres pilares de sostenibilidad. Los resultados se presentan en un balance triple. La metodología se aplicó al caso de estudio "producción de micro-cápsulas que contienen perfume" y se analizaron y compararon diferentes escenarios. Se seleccionaron diversos indicadores de sostenibilidad para analizar los impactos. Los resultados demostraron que esta metodología puede ser utilizada como herramienta de toma de decisiones y que puede aplicarse a cualquier proceso seleccionando, en cada caso, los datos del inventario y los indicadores.
SHARMA, ROOPALI. "DESIGN OF A PIXEL SCALE OPTICAL SAMPLE-AND-HOLD CIRCUIT SUITABLE FOR INTEGRATION IN MULTI-TECHNOLOGY FPGA". University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1141328237.
Texto completoQiu, Fengjing. "Analog very large scale integrated circuits design of two-phase and multi-phase voltage doublers with frequency regulation". Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175632756.
Texto completoKapil, Ankur. "Multi-scale simulation tools for design and decision making of sorption enhanced reaction processes in energy and biochemical systems". Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507227.
Texto completoHossain, Md Amjad. "DESIGN OF CROWD-SCALE MULTI-PARTY TELEPRESENCE SYSTEM WITH DISTRIBUTED MULTIPOINT CONTROL UNIT BASED ON PEER TO PEER NETWORK". Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent1606570495229229.
Texto completoDiBiasio, Christopher M. (Christopher Michael). "Concept synthesis and design optimization of meso-scale, multi-degree-of-freedom precision flexure motion systems with integrated strain-based sensors". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61518.
Texto completoThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 171-178).
The purpose of this research was to generate the knowledge required to 1) identify where and how to best place strain-based sensors in multi-degree-of-freedom (MDOF) flexure systems and 2) design a flexure system with optimal topology/size/shape for precision equipment and instrumentation. The success of many application areas (e.g. probe-based nanomanufacturing) hinges on the ability to design and realize low-cost, high-performance MDOF nanopositioners. The repeatability and accuracy of precision flexure-based instruments depends upon the performance of the flexure mechanism (e.g. bearings, actuators, and structural elements) and a metrology system (e.g. sensors). In meso-scale MDOF nanopositioners the sensing system must be integrated into the structure of the nanopositioner. The only viable candidate for small-scale, low-cost sensing is strain-based sensors; specifically piezoresistive sensors. Strain-based sensing introduces strong coupling and competition between the metrology and mechanical subsystems because these subsystems share a load path. Traditional tools for flexure system and compliant mechanism synthesis are not capable of simultaneously optimizing the mechanical and sensing subsystems. The building block synthesis approach developed in this work is the only tool capable of designing compliant mechanisms with integrated strain based sensing. Building block modeling allows for rapid synthesis and vetting of concepts. This approach also allows the designer to check concept feasibility, identify performance limits and tradeoffs, and obtain 1st order estimates of beam geometry. In short, this enables one to find an optimal design and set first order design parameters. The utility of the preceding is demonstrated via a case study. A meso-scale 6-DOF nanopositioner was designed via the building block synthesis approach. Polysilicon piezoresistors were surface micromachined onto a microfabricated silicon nanopositioner. The nanopositioner was actuated with moving magnet Lorentz force actuators. The final prototype costs less than $300 US and was found to have 10's of [mu]m range, nm-level resolution, and a 100 Hz 1st mode. The accuracy of the sensing system as determined by existing metrology equipment is better than 17% in-plane and better than 30% out-of-plane.
by Christopher M. DiBiasio.
Ph.D.
Ramos, Jubierre Javier [Verfasser], André [Akademischer Betreuer] [Gutachter] Borrmann y Christian [Gutachter] Koch. "Consistency preservation methods for multi-scale design of subway infrastructure facilities / Javier Ramos Jubierre ; Gutachter: André Borrmann, Christian Koch ; Betreuer: André Borrmann". München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1127728598/34.
Texto completoPröbstl, Alma [Verfasser], Samarjit [Akademischer Betreuer] Chakraborty, Andreas [Gutachter] Jossen, Qi [Gutachter] Zhu y Samarjit [Gutachter] Chakraborty. "Multi-Scale System Design and Management for Battery Health Optimization / Alma Pröbstl ; Gutachter: Andreas Jossen, Qi Zhu, Samarjit Chakraborty ; Betreuer: Samarjit Chakraborty". München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1220320706/34.
Texto completoCoull, Renee Katherine. "The impact of multi-stakeholder planning and design processes on large-scale residential developments : an evaluation of the Rodgers Creek Area development, British Columbia". Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/23490.
Texto completoRodriguez, Pila Ernesto. "Contribution aux choix de modélisations pour la conception de structures multi-échelle sous incertitudes". Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0222/document.
Texto completoThe design of multi-scale structures is based on predictive and experimental modelling. To achieve a high level of precision, modelling rest on a high number of experimental tests and sophisticated analytical and numerical developments integrating all possible knowledge about the quantity of interest. Adding knowledge into models diminishes the uncertainty on quantities of interest and significantly impacts the cost of modelling, a high impact factor on the design cost. The designer must be able to control the suitability of the integration of knowledge into the prediction of quantities of interest and its impact on the cost of modelling. The research carried out in this work is structured around the development of a methodology of assistance to the design under uncertainties allowing the designer to choose combinations between several predictive and experimental models, called modelling paths, presenting different compromises between the cost of modelling and the uncertainty on quantities of interest. The work is based on a pyramidal representation of experimental and predictive modelling. Random and epistemic uncertainties related to materials, models and geometrical tolerances are aggregated and propagated in the pyramid up to the quantities of interest of the structure. An adaptive method based on fuzzy logics for estimating the cost of modelling has been proposed. The multi objective problem aiming to minimizing the uncertainties on the quantities of interest and the cost of modelling is solved by means of the « NSGA-II » genetic algorithm, allowing to identify robust optimized modelling paths. This methodology is applied to a thick composite vessel for hydrogen storage. The proposed methodology demonstrates the possibility of rationalization of experimental and predictive models carried out to obtain the burst pressure of the vessel with a controlled precision. In a second step, the methodology is used to redesign the vessel considering larger or smaller volumes and with different burst pressure targets. Robust modelling paths obtained deliver design solutions adapted to the redesign requirements with a controlled modelling cost and a managed level of uncertainty
Pindat, Cyprien. "A Content-Aware Design Approach to Multiscale Navigation". Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-01016710.
Texto completoHarmes, Riccardo Lucian Paul. "Localism and the design of political systems". Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/30140.
Texto completoBasirat, Farzad. "Process Models for CO2 Migration and Leakage : Gas Transport, Pore-Scale Displacement and Effects of Impurities". Doctoral thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-315490.
Texto completoWagner, Julie. "A body-centric framework for generating and evaluating novel interaction techniques". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00772138.
Texto completoHecht, Martin. "Optimierung von Messinstrumenten im Large-scale Assessment". Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17270.
Texto completoMeasurement instruments are essential elements in the acquisition of knowledge in scientific research. Special features of measurement instruments in large-scale assessments of student achievement are their frequent reconstruction and the usage of different test versions. Here, threats for the accuracy and validity of the measurement may emerge. To minimize such threats, (a) sources for potential bias of measurement and (b) strategies to optimize measuring instruments should be explored. Therefore, the present dissertation investigates several specific topics within these two research areas.
Rodosik, Sandrine. "Etude de l'impact d'architectures fluidiques innovantes sur la gestion, la performance et la durabilité de systèmes de pile à combustible PEMFC pour les transports". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI090.
Texto completoAlthough hydrogen is booming, fuel cell electric vehicles are still rare on the market. Their high volume and complexity are still major hurdles to the development of PEM (Proton Exchange Membrane) systems for transport applications. This PhD. work aimed at studying two new fluidic circuits that can both simplify and reduce the system volume. Namely, the cathodic recirculation, and the Ping-Pong, which is a new fluidic architecture that alternate the fuel feed locations during operation. The performances of both architectures have been studied experimentally in automotive conditions on a 5 kW system. A multiscale analysis was conducted to compare, with other known architectures, the performances of the system, the stack and the homogeneity of the cell voltages inside the stack. The study was completed with a Ping-Pong durability test to evaluate the impact of this new operation on the fuel cell stack. The experimental data have been analyzed at different scales up to the post-mortem expertise of membrane-electrode assemblies
Yang, Bin. "Contribution to a kernel of symbolic asymptotic modeling software". Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2055/document.
Texto completoThis thesis is dedicated to develop a kernel of a symbolic asymptotic modeling software packageMEMSALab which will be used for automatic generation of asymptotic models for arrays of micro andnanosystems. Unlike traditional software packages aimed at numerical simulations by using pre-builtmodels, the purpose of MEMSALab is to derive asymptotic models for input equations by taking intoaccount their own features. An approach called ”by extension-combination” for the asymptotic modelingwhich allows an incremental model construction is firstly proposed for the homogenization modelderivation. It relies on a combination of the asymptotic method used in the field of partial differentialequations with term rewriting techniques coming from computer science. This approach focuses onthe model derivation for family of PDEs instead of each of them. An homogenization model of theelectrothermoelastic equation defined in a multi-layered thin domain has been derived by applyingthe mathematical method used in this approach. At last, an optimization tool has been developed bycombining a house-made optimization software package SIMBAD and COMSOL-MATLAB simulationand it has been applied for optimization of a SThM probe
Lauzet, Nicolas. "Prise en compte cumulée du réchauffement climatique et des surchauffes urbaines en phase amont de conception frugale des bâtiments centrée sur le confort des occupants : des propositions méthodologiques". Thesis, Lorient, 2019. http://www.theses.fr/2019LORIS551.
Texto completoWhile the IPCC's climate forecasts are more and more advanced and the phenomena related to the Urban Heat Island (UHI) are well understood, both are still not taken into account in the design of current buildings. How to take into account the global warming and urban overheating in buildings’ design? What are the impacts on the thermal behavior of buildings? What comfort criteria can be proposed to guide the choices of designers motivated by frugality? The first part presents how the building "sees" the climate. Currently, consulting agencies use averages over 10 or 30 years of measurements that give a weather file representative of the climate of an area, but which remove extreme conditions such as heat waves. However, these are and will increasingly constitute health risks for vulnerable people. A methodology is proposed to choose a real weather year by repositioning it in relation to the IPCC climate forecast. In the second part of the manuscript, the influence of the type of weather file used for buildings simulation on the comfort results is studied for a residential building located in the Confluence district in Lyon. This study focuses on the analysis of summer comfort, which is the major issue for adaptation to current and future climates. This part also contains methodological proposals for the analysis of health risks in indoor environments during extreme heatwave events. Finally, in the third and last part, we study the possibility of using the results of a urban microclimate tool to produce weather input for the building energy models. A chaining experiment between the CitySim and CIM tools, developed at EPFL Lausanne, is conducted on the same Confluence district in Lyon
Ryu, Kyeong Keol. "Automated Bus Generation for Multi-processor SoC Design". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5076.
Texto completoYin, Weiwei. "The role and regulatory mechanisms of nox1 in vascular systems". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44833.
Texto completoSa, Shibasaki Rui. "Lagrangian Decomposition Methods for Large-Scale Fixed-Charge Capacitated Multicommodity Network Design Problem". Thesis, Université Clermont Auvergne (2017-2020), 2020. http://www.theses.fr/2020CLFAC024.
Texto completoTypically present in logistics and telecommunications domains, the Fixed-Charge Multicommodity Capacitated Network Design Problem remains challenging, especially when large-scale contexts are involved. In this particular case, the ability to produce good quality soutions in a reasonable amount of time leans on the availability of efficient algorithms. In that sense, the present thesis proposed Lagrangian approaches that are able to provide relatively sharp bounds for large-scale instances of the problem. The efficiency of the methods depend on the algorithm applied to solve Lagrangian duals, so we choose between two of the most efficient solvers in the literature: the Volume Algorithm and the Bundle Method, providing a comparison between them. The results showed that the Volume Algorithm is more efficient in the present context, being the one kept for further research.A first Lagrangian heuristic was devised to produce good quality feasible solutions for the problem, obtaining far better results than Cplex, for the largests instances. Concerning lower bounds, a Relax-and-Cut algorithm was implemented embbeding sensitivity analysis and constraint scaling, which improved results. The increases in lower bounds attained 11\%, but on average they remained under 1\%.The Relax-and-Cut algorithm was then included in a Branch-and-Cut scheme, to solve linear programs in each node of the search tree. Moreover, a Feasibility Pump heuristic using the Volume Algorithm as solver for linear programs was implemented to accelerate the search for good feasible solutions in large-scale cases. The obtained results showed that the proposed scheme is competitive with the best algorithms in the literature, and provides the best results in large-scale contexts. Moreover, a heuristic version of the Branch-and-Cut algorithm based on the Lagrangian Feasibility Pump was tested, providing the best results in general, when compared to efficient heuristics in the literature
Polakowski, Matthew Ryan. "An Improved Lightweight Micro Scale Vehicle Capable of Aerial and Terrestrial Locomotion". Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1334600182.
Texto completoVadlmudi, Tripurasuparna. "A nano-CMOS based universal voltage level converter for multi-VDD SoCs". Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3602/.
Texto completoWang, Jialing Yang Xiaojun. "Multi-scale forest landscape pattern characterization". Diss., 2005. http://etd.lib.fsu.edu/theses/available/etd-08142005-151446.
Texto completoAdvisor: Xiaojun Yang, Florida State University, College of Social Sciences, Dept. of Geography. Title and description from dissertation home page (viewed Jan. 24, 2006). Document formatted into pages; contains xiv, 213 pages. Includes bibliographical references.
JONG-HARN, YWI CHI y 尉遲仲涵. "Design of SDN based Large-Scale Multi-Tenant Data Center Networks". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/04065276713127203383.
Texto completo國立中正大學
通訊工程研究所
103
Abstract— In this thesis, we propose an architecture for realizing a reliable large scale data center network. This network is a cost effective hybrid SDN-Ethernet network. We fully take advantage of the automatic learning capability of the Ethernet switches to simplify state management. By employing SDN switches in the core of the network, the system is able to perform route changes for supporting VM live migration and fast failure recovery. Using the proposed architecture, a single data center can support hundreds of thousand physical machines (PM) and own up to a million of virtual machines (VM). Besides, more than 64K tenants can share a single data center and each tenant can individually own up to 4K VLANs in their network. Each tenant is allowed to freely assign IP addresses and VLAN IDs to their VM. Unlike conventional IP network that employing packet broadcasting to handle ARP queries, in our system, ARP packets are considered to be control packets. They are processed in the system controller so as to mitigate the impact of ARP broadcast in a large data center To enhance reliability, dual SDN controllers are used to manage the network through in-band control channels. The controllers are able to detect network topology and computing servers automatically. It fully supports plug and play service to reduce the possible configuration errors introduced by human. We apply MPTCP to provide multiple subflows to enhance throughput of TCP connections. In this work, a novel congestion aware routing is propose for network load balancing. We have conducted experiments and simulations to evaluate the performance of the proposed network. The experimental results show that the system is able to handle heavy connection requests and resume connections after VM migrations within short time. Our simulation results also reveal that the proposed congestion aware routing outperforms ECMP. It improves the total MPTCP throughput significantly.
"Protein Folding & Dynamics Using Multi-scale Computational Methods". Doctoral diss., 2014. http://hdl.handle.net/2286/R.I.25005.
Texto completoDissertation/Thesis
Ph.D. Physics 2014
Chang, Fu-Hsing y 張富雄. "Development of Innovative Product Design Process Using Patent Multi-Scale Analysis and TRIZ Methodology". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/97arf3.
Texto completo國立臺北科技大學
工業工程與管理系碩士班
100
In recent years, because the competition between enterprises has been more intense, and the preference of consumers has changed dramatically. The production changing rapidly and diversely of styles cut down the life cycle of products today. The enterprises that concern about the property right and lot of professional techniques in production processes are increasing year by year, so it''s important to avoid patents issues in production developing processes. It took lot of manpower and resource to search, read patents and evaluate how to advance products patents avoiding designs in the past. We developed the concepts of production design processes for integrating the patent multi-scale analysis and TRIZ methodology in this study. First of all, we sorted out the key patents by the international patent classification codes, and then we found those patents similar with our target patents by the Multi-scale analysis. With the above described integrated approach, we used text mining technique and combined back-propagation neural network with user''s problems to provide the design direction for users to avoid patent issues by TRIZ methods. Finally, this study will be integrated for building the system process method and the specific application of innovation in the LED design patent.