Tesis sobre el tema "Discrete lines"
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England, Dean. "Operational planning of discrete component manufacturing lines". Thesis, Loughborough University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416182.
Texto completoSmith, Justin Wesley. "Points and Lines in the Plane". University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282052825.
Texto completoCayan, Fatma Nihan. "The Method Of Lines Solution Of Discrete Ordinates Method For Nongray Media". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607401/index.pdf.
Texto completoSotomayor, Polar Manuel Gustavo. "Analysis of Microstrip Lines on Substrates Composed of Several Dielectric Layers under the Application of the Discrete Mode Matching". Thesis, University of Gävle, University of Gävle, University of Gävle, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-3106.
Texto completoMicrostrip structures became very attractive with the development of cost-effective dielectric materials. Among several techniques suitable to the analysis of such structures, the discrete mode matching method (DMM) is a full-wave approach that allows a fast solution to Helmholz equation. Combined with a full-wave equivalent circuit, the DMM allows fast and accurate analysis of microstrips lines on multilayered substrates.
The knowledge of properties like dispersion and electromagnetic fields is essential in the implementation of such transmission lines. For this objective a MATLAB computer code was developed based on the discrete mode matching method (DMM) to perform this analysis.
The principal parameter for the analysis is the utilization of different dielectric profiles with the aim of a reduction in the dispersion in comparison with one-layer cylindrical microstrip line, showing a reduction of almost 50%. The analysis also includes current density distribution and electromagnetic fields representation. Finally, the data is compared with Ansoft HFSS to validate the results.
The German Aerospace Center has rights over the thesis work
Yesilgul, Mustafa y Firas Nasser. "Discrete event modelling and Simulation of an Assembly Line at GKN Driveline Köping AB". Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-20266.
Texto completoCetinay, Hande. "Models Of Synchronous Production Lines With No Intermediate Buffers". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612227/index.pdf.
Texto completoUscka-Wehlou, Hanna. "Digital lines, Sturmian words, and continued fractions". Doctoral thesis, Uppsala : Matematiska institutionen, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107274.
Texto completoLópez, De La Cova Trujillo Miguel Angel y Niklas Bertilsson. "Investigation of the workforce effect of an assembly line using multi-objective optimization". Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-13134.
Texto completoAltrabulsy, Osama. "A Simulation-based Optimization Approach for Automated Vehicle Scheduling at Production Lines". Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-18454.
Texto completoKhoshnoudirad, Daniel. "Aspects combinatoires des motifs linéaires en géométrie discrète". Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1046.
Texto completoDiscrete Geometry, as Theoretical Computer Science, studies in particular linear patterns such as discrete primitives in images: the discrete lines, discrete segments, the discrete planes, pieces of discrete planes, for example. In this work, I particularly focused on Farey diagrams that appear in the study of the $ (m, n) $ - cubes, ie the pieces of discrete planes. Among others, I study the Combinatorics of the Farey lines forming diagram Farey, establishing exact formulas. I also get an asymptotic estimate using Combinatorial Number Theory. Then, I get a lower bound for the cardinality of the Farey vertices. After that, we analyze the strategies used in the literature for the study of (m, n)- cubes only by Farey diagrams in two dimensions. In order to get new and more accurate bounds for (m, n)- cubes, one of the few available methods, is to propose a generalization for the concept of preimage of a discrete segment for (m, n) - cube, resulting in a new combinatorial inequality. Thus, we introduce the notion Farey diagram in three dimensions
Aboutaleb, Adam. "Empirical study of the effect of stochastic variability on the performance of human-dependent flexible flow lines". Thesis, De Montfort University, 2015. http://hdl.handle.net/2086/12103.
Texto completoAmini, Malaki Afshin. "A Study of the Effects of Operational Time Variability in Assembly Lines with Linear Walking Workers". Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell organisation och produktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-17877.
Texto completoSchanzenbächer, Florian. "Max-plus modeling of traffic on passenger railway lines with a junction : fundamental diagram and dynamic control". Thesis, Paris Est, 2020. http://www.theses.fr/2020PESC2098.
Texto completoThe aim of the doctoral thesis is to contribute on the developpement of real-time traffic control algorithms for mass transit railway systems with junctions, located in urban areas. The scientific ambition of the doctoral thesis is to develop a traffic model with a finer modelisation of the train-passengers interaction. The model will allow a more precise evaluation of the level of service offered to the passengers and of the decisions taken by the operator of the line. Basing on this modeling, we will develop a control algorithm (strategic/ tactical and operational) in order to enhance the service quality on the line. The objective of the Paris metro system operator, financing this thesis, is to have a ready-to-implement control system for a railway line with a junction
Laboureix, Bastien. "Hyperplans arithmétiques : connexité, reconnaissance et transformations". Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0040.
Texto completoThe digital world is littered with discrete mathematical structures, designed to be easily manipulated by a computer while giving our brains the impression of beautiful continuous real shapes. Digital images can thus be seen as subsets of Z^2. In discrete geometry, we are interested in the structures of Z^d and seek to establish geometric or topological properties on these objects. While the questions we ask are relatively simple in Euclidean geometry, they become much more difficult in discrete geometry: no more division, goodbye to limits, everything is just arithmetic. This thesis is also an opportunity to juggle many elementary notions of mathematics and computer science (linear algebra, rings, automata, real analysis, arithmetic, combinatorics) to solve discrete geometry questions. We are interested in the fundamental structures of this geometry: arithmetic hyperplanes. These have a very simple and purely arithmetical definition: an arithmetical hyperplane is the set of integer points lying between two parallel (real) affine hyperplanes. In this thesis, we discuss three problems involving arithmetic hyperplanes:- connectedness: is an arithmetic hyperplane composed of a single piece or of several pieces? The main contribution of this manuscript is to extend results already known for facewise connectedness for any neighbourhood. While certain phenomena remain in the general case, the combinatorial explosion makes it difficult to adapt known algorithms to solve the problem. We therefore adopt an analytical approach and prove connectivity properties by studying the regularity of a function. - recognition: how can we find out the characteristics of an arithmetic hyperplane? This is a more traditional problem in discrete geometry, with a very rich literature. To solve it, we propose a recognition algorithm based on the generalised Stern-Brocot tree. In particular, we introduce the notion of separating chord, which geometrically characterises the zones to which the parameters of an arithmetic hyperplane belong. - soft transformations: how can an arithmetic hyperplane be continuously transformed using translations or rotations? A discrete approach to homotopic transformations, we characterise the possible pixel movements in a discrete structure while preserving its geometric properties. Beyond the study of these problems and the results we were able to obtain, this thesis shows the interest of using the reals, and in particular real analysis, to better understand arithmetic hyperplanes. Arithmetic hyperplanes are largely characterised by their normal vector, which is often considered integer to obtain periodicity properties. Considering any real normal vectors provides greater flexibility and eliminates the noise induced by the arithmetic relationships of the vector. Finally, opening up to the real again is a way of building bridges to other branches of mathematics, such as word combinatorics or numbering systems
Aydin, Guzide. "Radiative-convective Model For One-dimensional Longwave Clear Sky Atmosphere". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12609826/index.pdf.
Texto completoMaldonado, Lopez Juan Pablo. "Some links between discrete and continuous aspects in dynamic games". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066271/document.
Texto completoIn this thesis we describe some links between a) discrete and continuous time games and b) games with finitely many players and games with a continuum of players. A motivation to the subject and the main contributions are outlined in Chapter 2. The rest of the thesis is organized in three parts: Part I is devoted to differential games, describing the different approaches for establishing the existence of the value of two player, zero sum differential games in Chapter 3 and pointing out connections between them. In Chapter 4 we provide a proof of the existence of the value using an explicit description of ε-optimal strategies and a proof of the equivalence of minimax solutions and viscosity solutions for Hamilton-Jacobi-Isaacs equations in Chapter 5. Part II concerns discrete time mean field games. We study two models with different assumptions, in particular, in Chapter 6 we consider a compact action space while in Chapter 7 the action space is finite. In both cases we derive the existence of an ε-Nash equilibrium for a stochastic game with finitely many identical players, where the approximation error vanishes as the number of players increases. We obtain explicit error bounds in Chapter 7 where we also obtain the existence of an ε-Nash equilibrium for a stochastic game with short stage duration and finitely many identical players, with the approximation error depending both on the number of players and the duration of the stage. Part III is concerned with two player, zero sum stochastic games with short stage duration, described in Chapter 8. These are games where a parameter evolves following a continuous time Markov chain, while the players choose their actions at the nodes of a given partition of the positive real axis. The continuous time dynamics of the parameter depends on the actions of the players. We consider three different evaluations for the payoff and two different information structures: when players observe the past actions and the parameter and when players observe past actions but not the parameter
Silva, Murilo da. "Implementação de um localizador de faltas híbrido para linhas de transmissão com três terminais baseado na transformada wavelet". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-11042008-110740/.
Texto completoThis work presents a study and development of a hybrid algorithm for fault detection, classification and location in tree terminal lines based on wavelet transform (WT). It will be presented in two versions: discrete wavelet transform (DWT) and stationary wavelet transform (SWT). The algorithm is called hybrid because it uses two fault location methodologies: one based on fundamental components and other based on traveling waves. The proposed methodology works either with synchronized tree terminal data or only local data. The hybrid fault locator chooses automatically which location technique to be used in order to reach a reliable and accurate fault location. In this manner, this technique can avoid some difficulties present in other techniques, aiming to reach an optimized fault location. The proposed hybrid fault location was evaluated by simulated fault signals obtained by alternative transient program (ATP). In the tests, several parameters, which would influence the performance of the hybrid algorithm, were varied, such as: fault inception angle, fault resistance, fault type, etc. The results obtained by the proposed methodology are very encouraging and it points out to a very promising application.
Manceaux, Antoine. "Contribution au rééquilibrage dynamique des lignes d'assemblage : modélisation, résolutions et applications". Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0279/document.
Texto completoAssembly lines are flow-oriented production systems. They are still typical in industrial production systems despite the evolution from mass-production to more personalized and fluctuating production. In order to meet customer demand (quantity, time, etc.) and to reduce manufacturing costs, the lines must be well balanced. In other words, the products need to move from one workstation to another with the same pace, usually called takt time. This assembly line design problem is widely studied in the literature under the name of ALBP (Assembly Line Balancing Problems). Nonetheless, few studies concern the on-line reconfiguration and in particular, the dynamic rebalancing. The work presented in this thesis focuses on the dynamic rebalancing of assembly lines in response to short-term events disturbing production. Two approaches have been studied for their simplicity, speed of implementation and innovation in the field of ALBP: the ILS approach (Iterated Local Search) and the reachability analysis approach based on a network of communicating automata. This study showed that both approaches can address the need for a quick resolution required by dynamic rebalancing problem but lacked for adaptation when model constraints or objectives are changed. A methodological approach for assembly line balancing problems modeling and resolution is proposed to bridge the gap of adaptability. To ensure the genericity of obtained models., the methodology is composed of two levels of abstraction: a study of the class of the considered problem and a focus on the specific problem to solve. Studies have been validated on industrial examples from Trane factories
Karri, Senanayak Sesh Kumar. "On the Links between Probabilistic Graphical Models and Submodular Optimisation". Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEE047/document.
Texto completoThe entropy of a probability distribution on a set of discrete random variables is always bounded by the entropy of its factorisable counterpart. This is due to the submodularity of entropy on the set of discrete random variables. Submodular functions are also generalisation of matroid rank function; therefore, linear functions may be optimised on the associated polytopes exactly using a greedy algorithm. In this manuscript, we exploit these links between the structures of graphical models and submodular functions: we use greedy algorithms to optimise linear functions on the polytopes related to graphic and hypergraphic matroids for learning the structures of graphical models, while we use inference algorithms on graphs to optimise submodular functions.The first main contribution of the thesis aims at approximating a probabilistic distribution with a factorisable tractable distribution under the maximum likelihood framework. Since the tractability of exact inference is exponential in the treewidth of the decomposable graph, our goal is to learn bounded treewidth decomposable graphs, which is known to be NP-hard. We pose this as a combinatorial optimisation problem and provide convex relaxations based on graphic and hypergraphic matroids. This leads to an approximate solution with good empirical performance. In the second main contribution, we use the fact that the entropy of a probability distribution is always bounded by the entropy of its factorisable counterpart mainly as a consequence of submodularity. This property of entropy is generalised to all submodular functions and bounds based on graphical models are proposed. We refer to them as graph-based bounds. An algorithm is developped to maximise submodular functions, which is NPhard, by maximising the graph-based bound using variational inference algorithms on graphs. As third contribution, we propose and analyse algorithms aiming at minimizing submodular functions that can be written as sum of simple functions. Our algorithms only make use of submodular function minimisation and total variation oracles of simple functions
Maciel, Lucio Flore [UNESP]. "Aplicação da simulação a eventos discretos no balanceamento de linha de montagem". Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/148830.
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O objetivo geral da pesquisa foi desenvolver um modelo de simulação a eventos discretos para ser aplicado ao balanceamento de uma linha de montagem de componentes numa empresa do setor automotivo, buscando aumentar a produtividade da linha e utilizando menores quantidades de insumos. Na situação estudada há muitos elementos com comportamento estocástico, que podem influenciar na produtividade da linha, além da diversidade de insumos que abastecem a montagem, o que torna o balanceamento da linha uma tarefa complexa e favorece o uso da Simulação como procedimento de solução. Na modelagem conceitual do problema estudado adotou-se o método IDEF-SIM e para a simulação foi utilizado o software ProModel®. Como resultados tem-se um modelo conceitual e implementado para uma linha de montagem que possibilitou informações interessantes sobre o problema, tais como: juntar funções de dois postos de trabalhos, eliminar excesso de movimentação e eliminar gargalos.
The overall objective of the research was to develop a simulation model discrete event to be applied to balancing an assembly line components in automotive company, seeking to increase line productivity and using lower amounts of inputs. In the situation studied for many elements with stochastic behavior, which may influence the productivity of the line beyond the range of products that supply assembly, which makes the balancing line a complex task and promotes the use of the simulation procedure as a solution. In conceptual modeling of the studied problem adopted the IDEF-SIM method and for the simulation we used the ProModel® software. As results has a conceptual model and implemented for an assembly line that has enabled interesting information about the problem, such as joining functions of two posts jobs, eliminate excess movement and eliminate bottlenecks.
Cremer-Schulte, Dominik Clemens. "On the links between natural amenities, residential processes and urban planning : lessons from an Alpine urban region". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAE002/document.
Texto completoUrban regions in and close to the Alps have specific characteristics: they combine a limited land resource for urban development with particular environmental quality in their mountainous hinterland. This combination makes them particularly prone to peri-urbanisation, and potentially social segregation. In the context of continued metropolisation, both of these processes work against central objectives of urban planning, notably compactness of settlement patterns, functional mix, social equity and cohesion. In Alpine urban regions, the links between the mountain environment, urban planning policies and residential processes remain, however, not well understood.This thesis analyses urban planning and residential moves in an Alpine urban region. It seeks to understand the links between the mountain environment, urban planning and notably two residential processes: peri-urbanisation and social segregation. Its general objective is to investigate how and to what extent these residential processes are influenced by (i) the mountain environment and (ii) urban planning policies and to develop recommendations for urban and regional planning. The thesis does this via three distinct contributions which use the urban region of Grenoble in the French Alps as a central study area.The first contribution addresses changes in contemporary urban planning practice in the study region. Based on qualitative research, it focuses on the shift towards strategic spatial planning and on territorial re-scaling towards large urban-peri-urban planning perimeters. The chapter shows the creation of new governance arenas which call into question local planning cultures.The second contribution investigates the links between preferences for the natural environment, residential moves and social segregation. Using location choice models for the study region and the Marseille metropolitan area, this chapter presents a counterfactual segregation analysis that compares segregation outcomes ``with'' and ``without'' preferences for the natural environment. The main result is that households' search for natural environments has significant impacts on social segregation. It most often contributes to reinforcing segregation, but can also be an attenuating factor.The last contribution investigates the links between urban planning policies and residential processes. The chapter develops a residential location choice model in order to predict and analyse residential demand patterns for different planning policy scenarios in terms of concentration and segregation. The scenario results show that continued trends in urban planning policies would sustain and potentially reinforce peri-urbanisation in the region. Confining planning policies are found to be capable of curbing and potentially reversing demand dispersion. Policies that aim at re-centralising demand sustain and potentially increase social segregation levels.The results of this thesis call for a stronger integration of the natural environment in urban and regional planning. If spatial disparities in environmental qualities contribute to residential processes that are detrimental to compact urban forms and an equitable access to environmental quality, then planning should incorporate and account for these disparities in order to prevent further loss of land resources, socio-spatial fragmentation and environmental inequality, not only in an Alpine urban region context
Taylor, Paul Geoffrey. "Quantifying the functional role of discrete movement variability: Links to adaptation and learning". Thesis, Australian Catholic University, 2016. https://acuresearchbank.acu.edu.au/download/8e0b296509df6f9f48db9492f39d38c680ddcdb87c3446055b5a993dfd8361e0/3760378/Taylor_2016_Quantifying_the_functional_role_of_discrete.pdf.
Texto completoManceaux, Antoine. "Contribution au rééquilibrage dynamique des lignes d'assemblage : modélisation, résolutions et applications". Electronic Thesis or Diss., Université de Lorraine, 2015. http://www.theses.fr/2015LORR0279.
Texto completoAssembly lines are flow-oriented production systems. They are still typical in industrial production systems despite the evolution from mass-production to more personalized and fluctuating production. In order to meet customer demand (quantity, time, etc.) and to reduce manufacturing costs, the lines must be well balanced. In other words, the products need to move from one workstation to another with the same pace, usually called takt time. This assembly line design problem is widely studied in the literature under the name of ALBP (Assembly Line Balancing Problems). Nonetheless, few studies concern the on-line reconfiguration and in particular, the dynamic rebalancing. The work presented in this thesis focuses on the dynamic rebalancing of assembly lines in response to short-term events disturbing production. Two approaches have been studied for their simplicity, speed of implementation and innovation in the field of ALBP: the ILS approach (Iterated Local Search) and the reachability analysis approach based on a network of communicating automata. This study showed that both approaches can address the need for a quick resolution required by dynamic rebalancing problem but lacked for adaptation when model constraints or objectives are changed. A methodological approach for assembly line balancing problems modeling and resolution is proposed to bridge the gap of adaptability. To ensure the genericity of obtained models., the methodology is composed of two levels of abstraction: a study of the class of the considered problem and a focus on the specific problem to solve. Studies have been validated on industrial examples from Trane factories
Bettersworth, Zachary S. "Nullification of Torus Knots and Links". TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1626.
Texto completoChao, Daphne (Yu Fen). "MDRIP: A Hybrid Approach to Parallelisation of Discrete Event Simulation". Thesis, University of Canterbury. Computer Science and Software Engineering, 2006. http://hdl.handle.net/10092/1076.
Texto completoAgunlejika, Oluwafunmilayo. "Efficient discrete modelling of axisymmetric radiating structures". Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21714.
Texto completoJanius, Camilla y Sahel Mir. "Using discrete event simulation : Improving efficiency and eliminating nonvalue added work". Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-35065.
Texto completoSamieinia, Shiva. "Digital Geometry, Combinatorics, and Discrete Optimization". Doctoral thesis, Stockholms universitet, Matematiska institutionen, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-47399.
Texto completoAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Submitted. Paper 5: Manuscript. Paper 6: Manuscript.
Tribess, Andrea. "Liens discrets : processus historiques dans le milieu agricole d'un village sarde, 1950-1990". Paris, EHESS, 2000. http://www.theses.fr/2000EHES0060.
Texto completoKalpokas, Justas. "Discrete moments of the Riemann zeta function and Dirichlet L-functions". Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121119_130728-97328.
Texto completoAnalizinė skaičių teorija yra skaičių teorijos dalis, kuri, naudodama matematinės analizės ir kompleksinio kintamojo funkcijų tyrimo metodus, sprendžia uždavinius susijusius su sveikaisiais skaičiais. Manoma, kad analizinės skaičių teorijos pradžią žymi Dirichlet eilučių ir Dirichlet L-funkcijų taikymai. Vienas iš pagrindinių analizinės skaičių teorijos tyrimo objektų yra Riemann’o dzeta funkcija. Riemann’o hipotezė teigia, kad visi netrivialieji nuliai yra ant kritinės tiesės. Disertacijoje nagrinėjamas Riemann’o dzeta funckijos reikšmių pasiskirstymas ant kritinės tiesės. Tam pasitelkiama Riemann’o dzeta funkcijos kreivė. Svarbus klausimas susijęs su kreive yra ar ši kreivė yra visur tiršta kompleksinių skaičių plokštumoje. Disertacijoje įrodoma, kad kreivė plečiasi į visas puse kompleksinių skaičių plokštumoje. Atskiras disertacijos pagrindinio rezultato atvejis gali būti formuluojamas taip – Riemann’o dzeta funkcija ant kritinės tiesės įgyja be galo daug neigiamų reikšmių, kurios yra neaprėžtos.
Le, Floc'h Laurence. "Cristaux électromagnétiques bidimensionnels discrets de taille finie : une étude théorique et expérimentale". Brest, 2005. http://www.theses.fr/2005BRES2022.
Texto completoThis thesis is devoted to the theoretical study and development of a novel class of Photonic Crystals (PCs) so-called Discrete Photonic Crystals (DPCs). DPCs are arrangements of multi-port networks interconnected by wave guides. Easily manufactured in the microwave domain, CPDs can be described exactly using a classical linear algebra. After a general introduction on several types of PC, an original study on one-dimensional PCs (1D PCs) is proposed. By considering these PCs as two-port networks, we develop a process of normalization. This tool allows us to perform a universal parametric study of the responses (scattering parameters). The theory is experimentally illustrated with a microstrip periodic transmission line. The concept is then extended to the 2D-type DPCs. Symmetries have been exploited to give the responses of the structure in analytical form and in normalised units. We propose an analysis of PC spectra behaviour by means of a reduced set of parameters whatever the characteristics of the waves. Special care has been with respect to the control of width frequency position and reflectivity of the Photonic Band-gap. A simple and fast design method applied to these “2D”-type DPC has been developed. Low-cost ring-shaped prototypes are fabricated using microstrip technology in the 0-7 GHz band. We finally conduct a theroretical and an experimental study on the effects of boundary conditions on 2D DPCs responses. The optimization of theses conditions enables us to envisage specific functions for applications such as filtering or switching devices
Rosenbaum, Leah F. "Exploring the On-line Partitioning of Posets Problem". Scholarship @ Claremont, 2012. http://scholarship.claremont.edu/scripps_theses/53.
Texto completoSilva, Rodrigo Cleber da [UNESP]. "Representação de linhas de transmissão, utilizando elementos discretos de circuitos, no domínio das fases". Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/87151.
Texto completoPROPG - Programa de Pós-Graduação
Neste trabalho será mostrado o desenvolvimento de dois modelos de linhas de transmissão, baseados em elementos discretos de circuitos, que fornecem respostas diretamente no domínio do tempo e nas fases. Os dois modelos propostos partem da hipótese de que um pequeno segmento de linha de transmissão pode ser representado por um circuito . Hipótese esta já validada para linhas monofásicas por diversos autores, e que neste trabalho será utilizada para representar pequenos segmentos de linhas bifásicas e trifásicas. Deste modo, tais linhas serão representadas por uma grande quantidade de blocos (constituídos de elementos discretos de circuitos que representam um pequeno segmento de linha) conectados em cascata. No primeiro modelo proposto, válido para representar linhas idealmente transpostas, as fases de cada um dos pequenos segmentos de linha são separados em seus modos de propagação, e as correntes e tensões são calculadas no domínio modal. No entanto a conversão fase-modo-fase está inserida nas equações de estado que descrevem as correntes e tensões ao longo da linha, sendo que não há a necessidade do usuário do modelo conhecer a teoria de representação de linhas no domínio modal. Uma vez que o modelo não usa explicitamente o processo de decomposição modal, neste trabalho o mesmo será considerado como sendo um modelo desenvolvido no domínio das fases sem o uso explícito da teoria de decomposição modal. Este modelo pode ser utilizado para representar linhas que podem ter suas fases desacopladas por matrizes reais e invariáveis em relação à frequência. A representação de pequenos segmentos de linhas por elementos discretos de circuitos também foi aplicada em linhas bifásicas e trifásicas sem plano de simetria vertical. Neste caso, devido ao fato de que as matrizes...
This paper will show the development of two models of transmission lines, based on discrete circuit elements, which provide answers directly in the time domain and phase. The two proposed models start from the assumption that a small segment of transmission line can be represented by a -circuit, this hypothesis has already been validated for single-phase by several authors and this work will be used to represent small segments of lines biphasic and triphasic. Thus, these lines will be represented by a large number of blocks (consisting of discrete circuit elements that represent a small segment of the line) in cascade. In the first model, valid for ideally transposed lines represent the phases of each small line segments are separated into their modes of propagation and the currents and voltages are calculated in the modal domain. However the conversion phase-mode-phase is inserted into the state equations describing the currents and voltages along the line being that there is no need for the user the model to know representation theory of modal lines. Since the model does not explicitly use modal decomposition process, this paper it will be considered to be a model developed in the field of the phases without the explicit use of modal decomposition theory. This model can be used to represent lines that may have decoupled phases for real matrices and invariant with respect to frequency. The representation of small line segments by discrete circuit elements has also been applied in biphasic and triphasic lines without vertical symmetry plane. In this case, due to the fact that the matrices that separate line in their modes of propagation are not real and invariant with respect to frequency, the model was developed directly in the field of the phases without the use of modal decomposition matrices
Coupat, Raphaël. "Méthodologie pour les études d’automatisation et la génération automatique de programmes Automates Programmables Industrielssûrs de fonctionnement. Application aux Equipements d’Alimentation des Lignes Électrifiées". Thesis, Reims, 2014. http://www.theses.fr/2014REIMS019/document.
Texto completoThe research project presented in this thesis has been realized with the collaboration of the Engineer Department of the SNCF and the CReSTIC of the University of Reims Champagne-Ardenne. The goal of this project is to contribute to the improvement of the control studies of the electrification projects realized by the design engineers. This project must meet human, economic and technical aims expressed by the SNCF applied to the field of the Power Supply Equipments of the Electrified Lines (EALE in french). To answer these problems, a methodology for the automation studies is proposed. It integrates two research orientations were studied. The first axis is the automatic generation the deliverables (codes, documents, diagrams…). This axis is based on standardization and modeling of the “work”. MDD (Model Driven Development) and DSM (Domain Specific Modeling) approaches, brings suggestions for solution based on the use of “work templates”. However, it is fundamental to generate quality deliverables and safe PLC (Programmable Logic Controller) code. The second research orientation is interested in safe control. Three approaches of control synthesis (Supervisory Control Theory (SCT), the algebraic synthesis, the control by logical constraints) permitting a priori to reach these aims of safety are presented and discussed. The major advantage of the control by logical constraints is to separate the safety (which is checked formally off line by model-checking) and the functional parts. It can be used with existing PLC programs, which doesn't change thus the working methodology of the design engineers
Ubertosi, Fabrice. "Chenalisation de l'écoulement et du transport dans les milieux fracturés : approche discrète par réseaux de liens". Poitiers, 2008. http://www.theses.fr/2008POIT2257.
Texto completoThe complexity of fractured reservoirs makes that for the moment there is not any conceptual approach to these media either simple and accurate. The continuous simple-medium approach is probably the easier-one to handle but remains imprecise because unable to homogenize the local information. Multicontinuum approaches and discrete approaches to the fracture network are more relevant but induce some numerical efforts as well as a huge parameterization often unaffordable in terms of conditioning on available data. The work in this manuscript is on the side of a discrete representation of the medium with the eventual addition of stagnant continuums for simulating solute transport. The model claims to be but simple and thus slightly less accurate. The loss of precision is the consequence of accounting for main water fluxes (channels) only. The simplification comes from a 1D single bond homogenized representation of the local heterogeneity within each flowing channel. A 3D network of 1D bonds can be built dynamically by accounting for both the general head gradient and the geometry of the principal families of fractures. This network of bonds rests however on an invariant bombing of nodes representing bond intersections. The model can then calculate steady-state and transient flow as well as solute transport with a few additional retention and reaction mechanisms. Incidentally, solving transport is based on a Time Domain Random Walk method (TDRW) which is worth and rapid when handled over a network of 1D bonds. Finally, the model reveals interesting since it generates an evolutionary simplified network (the network can be deformed, or more exactly redistributed, while keeping invariant seed nodes) according to flow conditions and it is able to mimic correctly the mean behavior of a fracture network. The deformation capacity of the bond network and its relative ease of handling should allow in the end to tackle with the inversion of transport scenarios by optimizing both the local parameters of the bonds and the network geometry
Silva, Rodrigo Cleber da. "Representação de linhas de transmissão, utilizando elementos discretos de circuitos, no domínio das fases /". Ilha Solteira : [s.n.], 2012. http://hdl.handle.net/11449/87151.
Texto completoBanca: Luiz Fernando Bovolato
Banca: Marcos de Araujo Paz
Resumo: Neste trabalho será mostrado o desenvolvimento de dois modelos de linhas de transmissão, baseados em elementos discretos de circuitos, que fornecem respostas diretamente no domínio do tempo e nas fases. Os dois modelos propostos partem da hipótese de que um pequeno segmento de linha de transmissão pode ser representado por um circuito . Hipótese esta já validada para linhas monofásicas por diversos autores, e que neste trabalho será utilizada para representar pequenos segmentos de linhas bifásicas e trifásicas. Deste modo, tais linhas serão representadas por uma grande quantidade de blocos (constituídos de elementos discretos de circuitos que representam um pequeno segmento de linha) conectados em cascata. No primeiro modelo proposto, válido para representar linhas idealmente transpostas, as fases de cada um dos pequenos segmentos de linha são separados em seus modos de propagação, e as correntes e tensões são calculadas no domínio modal. No entanto a conversão fase-modo-fase está inserida nas equações de estado que descrevem as correntes e tensões ao longo da linha, sendo que não há a necessidade do usuário do modelo conhecer a teoria de representação de linhas no domínio modal. Uma vez que o modelo não usa explicitamente o processo de decomposição modal, neste trabalho o mesmo será considerado como sendo um modelo desenvolvido no domínio das fases sem o uso explícito da teoria de decomposição modal. Este modelo pode ser utilizado para representar linhas que podem ter suas fases desacopladas por matrizes reais e invariáveis em relação à frequência. A representação de pequenos segmentos de linhas por elementos discretos de circuitos também foi aplicada em linhas bifásicas e trifásicas sem plano de simetria vertical. Neste caso, devido ao fato de que as matrizes... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This paper will show the development of two models of transmission lines, based on discrete circuit elements, which provide answers directly in the time domain and phase. The two proposed models start from the assumption that a small segment of transmission line can be represented by a -circuit, this hypothesis has already been validated for single-phase by several authors and this work will be used to represent small segments of lines biphasic and triphasic. Thus, these lines will be represented by a large number of blocks (consisting of discrete circuit elements that represent a small segment of the line) in cascade. In the first model, valid for ideally transposed lines represent the phases of each small line segments are separated into their modes of propagation and the currents and voltages are calculated in the modal domain. However the conversion phase-mode-phase is inserted into the state equations describing the currents and voltages along the line being that there is no need for the user the model to know representation theory of modal lines. Since the model does not explicitly use modal decomposition process, this paper it will be considered to be a model developed in the field of the phases without the explicit use of modal decomposition theory. This model can be used to represent lines that may have decoupled phases for real matrices and invariant with respect to frequency. The representation of small line segments by discrete circuit elements has also been applied in biphasic and triphasic lines without vertical symmetry plane. In this case, due to the fact that the matrices that separate line in their modes of propagation are not real and invariant with respect to frequency, the model was developed directly in the field of the phases without the use of modal decomposition matrices
Mestre
Cousty, Jean. "Lignes de partage des eaux discrètes : théorie et application à la segmentation d'images cardiaques". Phd thesis, Université de Marne la Vallée, 2007. http://tel.archives-ouvertes.fr/tel-00321885.
Texto completoLa ligne de partage des eaux topologique (LPE) étend la notion de clivage aux graphes dont les sommets sont valués et permet de segmenter une image. Nous étendons les propriétés des clivages dans les graphes de fusion aux cas des fonctions et proposons un algorithme de LPE
monotone et linéaire dans les grilles de fusion parfaites. Grâce à la notion de graphe d'arêtes, les propriétés des LPE dans les grilles de fusion parfaites s'étendent aux graphes à arêtes valuées.
Nous étudions en profondeur les LPE dans les graphes à arêtes valuées. Les LPE peuvent y être définies en suivant l'idée intuitive de gouttes d'eau s'écoulant sur un relief topographique. Nous établissons aussi bien la consistance que l'optimalité de cette définition. De plus, nous proposons deux algorithmes linéaires qui, à notre connaissance, sont les plus efficaces pour le calcul des LPE.
En nous reposant sur ces résultats théoriques, nous proposons une méthode et développons un logiciel pour la segmentation du ventricule gauche dans des images cardiaques 3D+t par résonance magnétique. La méthode est quantitativement et qualitativement validée par comparaison avec des segmentations manuelles tracées par deux experts cardiologues.
Ragavan, Prasanna Kumar. "Adaptive Sampling Line Search for Simulation Optimization". Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/84938.
Texto completoPh. D.
Osty, Guillaume. "Extraction de particularités sur données discrètes issues de numérisation 3D : partitionnement de grands nuages de points". Cachan, Ecole normale supérieure, 2002. http://www.theses.fr/2002DENS0003.
Texto completoSpacek, Pavel. "Modélisation, analyse et commande des systèmes à événements discrets par l’algèbre des dioides : application aux lignes de galvanoplastie". Besançon, 1998. http://www.theses.fr/1998BESA2011.
Texto completoArekar, Chaitanya. "Real time analysis with development, simulation and validation of discrete element method models for tumbling mill charge motion and liner wear". Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81524.
Texto completoIn this thesis, we have carried out real time analysis of the DEM model to enable online availability of the mill parameters for the mill operators. We have completed rigorous validation of a DEM model based on nine mill parameters by comparing the predicted parameters under varying operating conditions of a 30" pilot mill and some simulated industrial mills. Further, we have also developed a simulator to predict the wear on the tumbling mill liner profile.
Results show that the charge motion simulator used is faster than real time. The validation exercise showed that improvements to charge motion are possible, liner wear prediction is feasible but affects real-time simulator behaviour. Based on these results, it is recommended to continue the improvement of the charge motion model as well as the liner wear model.
Mazauric, Dorian. "Optimisation discrète dans les réseaux de télécommunication : reconfiguration du routage, routage efficace en énergie, ordonnancement de liens et placement de données". Phd thesis, Université de Nice Sophia-Antipolis, 2011. http://tel.archives-ouvertes.fr/tel-00643513.
Texto completoHan, Junyu. "Fault location on mixed overhead line and cable network". Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/fault-location-on-mixed-overhead-line-and-cable-network(1a911a42-ddfa-4592-8365-badc8d5c45f3).html.
Texto completoSaid, Mouhammad. "Géométrie multi-résolution des objets discrets bruités". Grenoble, 2010. http://www.theses.fr/2010GRENM084.
Texto completoBoundary curves are compact and descriptive means for defining regions or shapes in the plane. It is well known that shapes should be studied at different scales. This has led to the development of regular and irregular pyramids for shape analysis and scene understanding. However there exists no analytical description of the multiresolution of a digital shape, contrary to the famous scale-space analysis in the continuous world. Moreover, in the context of digital geometry, geometric primitives such as lines, circles or polynomials are of a great importance. For instance, pieces of digital lines are excellent tangent estimators, circular arcs estimate curvature. It is thus fundamental to keep them in the multiscale analysis of digital boundaries. One of the contribution of this thesis is to give new analytical results on the multiresolution of Digital Straight Line (DSL) and Digital Straight Segment (DSS). Figueiredo is the first one who studied the behavior of 8-connected lines when changing the resolution of the grid [41]. In this work, we consider a standard digital line. The objective is to provide an analytic description of digital straight line DSL when the resolution of the grid is changed by an arbitrary factor. We also prove that their subsampling is a standard digital line. As analytical formulae for DSS appear to be a much harder problem and DSS are finite parts of DSL, we propose an indirect path to DSS multiresolution. Given a DSS, we build two DSL whose intersection contains it and whose main connected part has the same arithmetic characteristics as well as the same number of patterns. We note here that we propose new results about the combinatorics of such digital line intersections. We determine the multiresolution of DSS by examining the multiresolution of the intersection of these two DSL. We give a new analytical description of this set with arithmetic inequalities. We also address the problem of computing the exact characteristics of any subsegment of digital straight line with known characteristics. We present two new algorithms SmartDSS and ReversedSmartDSS that solve this problem. Their principle is to climb the Stern-Brocot tree of fraction either in a top-down or bottom-up way. Their worst-time complexity are better than the classical DSS recognition algorithm. Both algorithms are useful to compute efficiently the multiresolution of a DSS. The noise along digital contours is not really detected but is rather canceled out by thickening digital straight segments. The thickness is tuned by a user and set globally for the contour. To overcome this issue, we propose an original strategy to detect locally both the amount of noise and the meaningful thickness of each point of a digital contour. This work is based on the asymptotic properties of blurred segments with different thicknesses and forms an alternative to the multiscale approach to noise detection
Maciel, Lucio Flore. "Aplicação da simulação a eventos discretos no balanceamento de linha de montagem /". Guaratinguetá, 2016. http://hdl.handle.net/11449/148830.
Texto completoBanca: José Roberto Dale Luche
Banca: Roberto Campos Leoni
Resumo: O objetivo geral da pesquisa foi desenvolver um modelo de simulação a eventos discretos para ser aplicado ao balanceamento de uma linha de montagem de componentes numa empresa do setor automotivo, buscando aumentar a produtividade da linha e utilizando menores quantidades de insumos. Na situação estudada há muitos elementos com comportamento estocástico, que podem influenciar na produtividade da linha, além da diversidade de insumos que abastecem a montagem, o que torna o balanceamento da linha uma tarefa complexa e favorece o uso da Simulação como procedimento de solução. Na modelagem conceitual do problema estudado adotou-se o método IDEF-SIM e para a simulação foi utilizado o software ProModel®. Como resultados tem-se um modelo conceitual e implementado para uma linha de montagem que possibilitou informações interessantes sobre o problema, tais como: juntar funções de dois postos de trabalhos, eliminar excesso de movimentação e eliminar gargalos
Abstract: The overall objective of the research was to develop a simulation model discrete event to be applied to balancing an assembly line components in automotive company, seeking to increase line productivity and using lower amounts of inputs. In the situation studied for many elements with stochastic behavior, which may influence the productivity of the line beyond the range of products that supply assembly, which makes the balancing line a complex task and promotes the use of the simulation procedure as a solution. In conceptual modeling of the studied problem adopted the IDEF-SIM method and for the simulation we used the ProModel® software. As results has a conceptual model and implemented for an assembly line that has enabled interesting information about the problem, such as joining functions of two posts jobs, eliminate excess movement and eliminate bottlenecks
Mestre
Lopez, Paola Johana Saboya. "Uma contribuição ao problema de detecção de ruídos impulsivos para power line communication". Universidade Federal de Juiz de Fora (UFJF), 2013. https://repositorio.ufjf.br/jspui/handle/ufjf/4155.
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A presente dissertação tem por objetivo propor e avaliar cinco técnicas de detecção de ruídos impulsivos para a melhoria da transmissão digital de dados via redes de energia elétrica (do inglês, Power Line Communications) (PLC). As técnicas propostas contemplam a detecção de ruídos impulsivos no domínio do tempo discreto, no domínio da transformada wavelet discreta (do inglês, Discrete Wavelet Transform) (DWT) e no domínio da transformada discreta de Fourier (do inglês, Discrete Fourier Transform) (DFT). Tais técnicas fazem uso de métodos de extração e seleção de características, assim como métodos de detecção de sinais baseados na teoria de Bayes e redes neurais. Análises comparativas explicitam as vantagens e desvantagens de cada uma das técnicas propostas para o problema em questão, e ainda indicam que estas são bastante adequadas para a solução do mesmo.
This dissertation aims to propose and evaluate five techniques for impulsive noise detection in order to improve digital communications through power line channels. The imput signals for the proposed detection techniques are impulsive noise signals on discrete-time domain, on the Discrete Wavelet Transform domain and on the Discrete Fourier Transform domain and it makes use of feature extraction and selection techniques, as well as detection techniques supported on Bayes Theory and Multi-layer Perceptron Neural Networks. Comparative analysis show some advantages and disadvantages of each proposed technique and the relevance of them to solve the impulsive noise detection problem.
Albaba, Adel. "Modélisation par éléments discrets de l’impact des laves torrentielles granulaires sur des structures rigides et flexibles". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI111/document.
Texto completoNatural hazards such as debris flows are real threat to the urbanization of mountainousareas. Local communities and infrastructures can be exposed to large impact forces inextreme debris events. Mitigation of such threats requires, along other measures, theestimation of the impact of such flows on protection structures (rigid walls and flexiblebarriers). In this thesis, Discrete Element Method (DEM) is used to model the granularflow, the rigid walls and flexible barriers.First, a dry granular flow made of non-spherical particles flowing in inclined plane ismodeled using a visco-elastic contact law with Mohr-Coulomb failure criterion. Experimentaldata from the literature is used to calibrate and validate the model. The modelis calibrated based on the shape of the particle, the flow thickness and the final shapeof the deposit on the wall. Validation procedure is based on the impact on a rigid walldivided into six segments. The main contribution of total normal force applied on thewall is found to be due to the dynamic component. On the micro-scale, development offorce chains is believed to cause heterogeneous distribution of normal force on each partof the wall, for multiple same-test conditions.Next, a flexible barrier is modeled using cylindrical elements. The impact on thebarrier is modeled using the same flow model used for wall-impact problem. The use ofenergy dissipators is found to be essential for minimizing the impact force on the barrier,and thus controlling the force applied on the lateral anchors.By comparing a rigid wall and a flexible barrier for the same flow, we found thatthe rigid wall is exposed to higher impact force, due its high global stiffness comparedwith the flexible barrier. Next, different simulations are carried out to recommend designguidelines for the flexible barrier. It is found that using a mesh size as large as D90 of theviflow is acceptable in terms of mass retaining capacity. In addition, not fixing the bottomcable of flexible barriers might lead to the total loss of its retaining capacity in extremeevents
Nader, François. "Modélisation de la rupture 3D des grains polyédriques par éléments discrets". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI082/document.
Texto completoRockfill structures are very popular among civil engineering structures (dams, retaining walls, . . . ). Important settlements can take place during the lifetime of these structures, settlements mainly caused by the breakage of rockfill grains. This thesis proposes a numerical model that allows the simulation of the behavior of granular materials exhibiting grain breakage. To take into account the discrete nature of these media, the discrete element method is chosen. The adopted strategy is the Non-Smooth Contact Dynamics method, where grains are considered to be rigid. To generate blocks having complex shapes, a 3D grain model is suggested. This grain model is then discretized into tetrahedral subgrains, joined together using cohesive bonds so that breakage can be simulated. A Mohr-Coulomb failure criterion is used for the cohesive bonds. The model is implemented into the LMGC90 software platform. At first, the model is tested in single grain crushing simulations between two plates. Multiple parameters controling the strength of the grain are studied : the intra-granular cohesion, the size, the discretization and the orientation of the grain. The scale effect that characterizes this type of material is verified. Then the model is tested in numerical simulations of œdometric compression of rockfill. The influence of the parameters of the model and of those of the granular medium are studied. The results of œdometric simulations are compared to experimental results, and present a good agreement. Lastly, numerical experimentations are conducted in order to study the energies that are brought into play in the simulations. The surface creation energy is estimated for this type of material. Results are close to the data provided in the literature
Ferrari, Sandro Mauro. "Identificação on-line de motores de indução através de modelo discreto para sinais senoidais". Universidade do Estado de Santa Catarina, 2006. http://tede.udesc.br/handle/handle/1882.
Texto completoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
In this work are developed two on-line identification methods for three-phase induction motors based on discrete models obtained when we consider continuous systems excited by sinusoidal signals. The first method uses the discrete model of the homopolar machine in the stationary frame to estimate the stator resistance and the stator dispersion inductance and the discrete model of the linear system existent among the stator flux and current in the rotor frame to estimate all the electric parameters of the motor. The second method, besides this last model, presupposes to estimate the stator resistance with DC excitation added to the supply voltage of the motor and the knowledge of the motor class, in order to estimate the other electric parameters through classical methods of least squares parameters estimation. The two methods presuppose the estimate of the rotor frame signals from measurements of stator currents in the stationary frame and measurement of the rotor angular velocity. Simulation and experimental results illustrate the proposed methods.
Neste trabalho são desenvolvidos dois métodos on-line para identificação do motor de indução trifásico baseados em modelos discretos obtidos ao se considerar sistemas contínuos excitados por sinais senoidais. O primeiro método utiliza o modelo discreto da máquina homopolar no referencial estacionário para estimar a resistência estatórica e a indutância de dispersão de estator e o modelo discreto da relação linear existente entre o fluxo estatórico e a corrente estatórica no referencial que gira com o rotor para a obtenção dos demais parâmetros elétricos. No segundo método, além deste último modelo, pressupõe-se a estimação da resistência de estator através do acréscimo de excitação C.C. à tensão bifásica de alimentação do motor. A obtenção dos demais parâmetros elétricos é realizada através de métodos clássicos de Mínimos Quadrados, sendo necessário o conhecimento da classe do motor. Os dois métodos pressupõem a estimação dos sinais no referencial que gira com o rotor a partir das medidas de correntes de estator no referencial estacionário e da medição da rotação do motor. Resultados de simulação e experimentais ilustram a metodologia proposta.
Xia, Johnny. "A NEW STUDY OF UNBALANCED PRODUCTION LINE WITH OPTIMIZATION". Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-15149.
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