Rozprawy doktorskie na temat „Discrete location”
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Velten, Sebastian. "Discrete location problems with flexible objectives". Hamburg Kovač, 2008. http://d-nb.info/992492661/04.
Pełny tekst źródłaDominguez-Marin, Patrizia. "The discrete ordered median problem: models and solution methods /". Dordrecht [u.a.] : Kluwer Acad. Publ, 2003. http://www.loc.gov/catdir/enhancements/fy0822/2003061145-d.html.
Pełny tekst źródłaMeyer, Tanja. "Discrete and absolute hub location problems theory and algorithms". München Verl. Dr. Hut, 2008. http://d-nb.info/992163579/04.
Pełny tekst źródłaNunes, Letícia Faria de Carvalho. "Practice location of physicians: a discrete choice model approach". reponame:Repositório Institucional do FGV, 2015. http://hdl.handle.net/10438/13827.
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Economists and policymakers have long been concerned with increasing the supply of health professionals in rural and remote areas. This work seeks to understand which factors influence physicians’ choice of practice location right after completing residency. Differently from previous papers, we analyse the Brazilian missalocation and assess the particularities of developing countries. We use a discrete choice model approach with a multinomial logit specification. Two rich databases are employed containing the location and wage of formally employed physicians as well as details from their post-graduation. Our main findings are that amenities matter, physicians have a strong tendency to remain in the region they completed residency and salaries are significant in the choice of urban, but not rural, communities. We conjecture this is due to attachments built during training and infrastructure concerns.
Chang, Jin. "SINGLE ENDED TRAVELING WAVE BASED FAULT LOCATION USING DISCRETE WAVELET TRANSFORM". UKnowledge, 2014. http://uknowledge.uky.edu/ece_etds/58.
Pełny tekst źródłaXu, Yuanquan. "A discrete choice based facility location model for inland container depots". Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1113.
Pełny tekst źródłaTitle from document title page. Document formatted into pages; contains x, 126 p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references (p. 98-103).
Durán, Mateluna Cristian. "Exact solution methods for large-scale discrete p-facility location problems". Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAE001.
Pełny tekst źródłaThis thesis focuses on the exact solution of the NP-hard problems p-median and p-center, combinatorial optimization problems that quickly become difficult to solve as the instance size increases. These discrete location problems involve opening a defined number p of facilities and then allocating to them a set of clients according to an objective function to be minimized.First, we study the p-median problem, which seeks to minimize the sum of distances between clients and the open facilities to which they are allocated. We develop an algorithm based on Benders decomposition that outperforms state-of-the-art exact methods. The algorithm considers a two-stage approach and an efficient algorithm for separating Benders cuts. The method has been evaluated on over 230 benchmark instances with up to 238025 clients and sites. Many instances are solved to optimality for the first time or have their best known solution improved.Secondly, we explore the p-center problem, which seeks to minimize the largest distance between a client and its nearest open facility. We first compare the five main MILP formulations in the literature. We study the Benders decomposition and also propose an exact algorithm based on a client clustering procedure based on the structure of the problem. All the proposed methods are compared with the state-of-the-art on benchmark instances. The results obtained are analyzed, highlighting the advantages and disadvantages of each method.Finally, we study a robust two-stage p-center problem with uncertainty on node demands and distances. We introduce the robust reformulation of the problem based on the five main deterministic MILP formulations in the literature. We prove that only a finite subset of scenarios from the infinite uncertainty set can be considered without losing optimality. We also propose a column and constraint generation algorithm and a branch-and-cut algorithm to efficiently solve this problem. We show how these algorithms can also be adapted to solve the robust single-stage problem. The different proposed formulations are tested on randomly generated instances and on a case study drawn from the literature
Danancher, Mickaël. "A discrete event approach for model-based location tracking of inhabitants in smart homes". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00955543.
Pełny tekst źródłaHan, 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.
Pełny tekst źródłaFluty, Wesley. "FAULT LOCATION TECHNIQUES USING THE TRAVELING WAVE METHOD AND THE DISCRETE WAVELET TRANSFORM". UKnowledge, 2019. https://uknowledge.uky.edu/ece_etds/146.
Pełny tekst źródłaBayoh, Isaac Moussa. "Estimating the determinants of household residential location choice using a multinomial, discrete choice model". The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1374586719.
Pełny tekst źródłaDesai, Jitamitra. "A Discrete Optimization Approach to Solve a Reader Location Problem for Estimating Travel Times". Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32683.
Pełny tekst źródłaMaster of Science
Inoa-Peña, Ignacio. "Sur l’interdépendance entre localisation résidentielle et localisationprofessionnelle : modèles de choix discrets". Thesis, Cergy-Pontoise, 2015. http://www.theses.fr/2015CERG0792.
Pełny tekst źródłaThis thesis studies the interdependency between the choices of residential and workplace location. Issues such as the decision-making process, the accessibility to jobs, the geographical distribution of job types, and the spouses collective decision process, among others, are analyzed with discrete choice models. In this setting, we study the location decisions from two complementary points of view. (1) First, we study the interdependency between the two location choices without any within-household consideration. We develop a three-level nested logit model of residential and workplace location and study the effect of individual-specific attractiveness and accessibility (log-sum) measures. Results presented in the first chapter show that the individual-specific accessibility measure is an important determinant of the choice of residential location and its effect differs along the household life cycle. Additionally, the attractiveness of the types of employment is a better predictor of the workplace location than the usual total number of jobs. We analyze the evolution of the attractiveness and attractivity measures in the second chapter. (2) Second, we study the interdependency of residential location and workplaces within the household. This thesis contributes with a within-household bargaining process model of location decisions. As such, it applies the collectiveapproach à la Chiappori of household behavior to describe residential location choice of two-worker households. The last chapter develops and estimates a two-step structural model to disentangle bargaining powers from spouses' values of time. Results show that the nationalities of the couple, their education level, as well as the age difference between spouses play a crucial role in determining bargaining power
Espinoza, García Juan Carlos. "Robust optimization for discrete structures and non-linear impact of uncertainty". Thesis, Cergy-Pontoise, Ecole supérieure des sciences économiques et commerciales, 2017. http://www.theses.fr/2017ESEC0004/document.
Pełny tekst źródłaWe address decision problems under uncertain information with non-linear structures of parameter variation, and devise solution methods in the spirit of Bertsimas and Sim’s Γ-Robustness approach. Furthermore, although the non-linear impact of uncertainty often introduces discrete structures to the problem, for tractability, we provide the conditions under which the complexity class of the nominal model is preserved for the robust counterpart. We extend the Γ-Robustness approach in three avenues. First, we propose a generic case of non-linear impact of parameter variation, and model it with a piecewise linear approximation of the impact function. We show that the subproblem of determining the worst-case variation can be dualized despite the discrete structure of the piece-wise function. Next, we built a robust model for the location of new housing where the non-linearity is introduced by a choice model, and propose a solution combining Γ-Robustness with a scenario-based approach. We show that the subproblem is tractable and leads to a linear formulation of the robust problem. Finally, we model the demand in a Location Problem through a Poisson Process inducing, when demands are uncertain, non-linear structures of parameter variation. We propose the concept of Nested Uncertainty Budgets to manage uncertainty in a tractable way through a hierarchical structure and, under this framework, obtain a subproblem that includes both continuous and discrete deviation variables
Allen, Timothy E. "Using discrete event simulation to assess obstacle location accuracy in the REMUS unmanned underwater vehicle". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FAllen.pdf.
Pełny tekst źródłaToll, Kristopher C. "Using a Discrete Choice Experiment to Estimate Willingness to Pay for Location Based Housing Attributes". DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7657.
Pełny tekst źródłaRoth, Matthias. "Identification and fault diagnosis of industrial closed-loop discrete event systems". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2010. http://tel.archives-ouvertes.fr/tel-00561906.
Pełny tekst źródłaCabezas, García José Xavier. "Heuristic methods for solving two discrete optimization problems". Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31093.
Pełny tekst źródłaPonce, Lopez Diego. "The Discrete Ordered Median Problem revisited: new formulations, properties and algorithms". Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/234342.
Pełny tekst źródłaCette dissertation étudie en profondeur la structure du "Discrete Ordered Median Problem" (DOMP), afin de proposer de nouvelles formulations et de nouveaux algorithmes de résolution. De plus, une extension intéressante du DOMP nommée MDOMP ("Monotone Discrete Ordered Median Problem") a été étudiée.Cette thèse a été structurée en trois grandes parties.La première partie présente une étude riche aux niveaux théorique et expérimentale. Elle développe plusieurs formulations pour le DOMP qui sont basées sur des problèmes d'ordonnancement largement étudiés dans la littérature. Plusieurs d'entres elles nécessitent un nombre réduit de contraintes pour définir le problème en ce qui concerne certaines formulations connues antérieurement. Les bornes inférieures, qui sont obtenues par la résolution de la relaxation linéaire, donnent de meilleurs résultats que les formulations précédentes et ceci même avec tout processus de renforcement désactivé. S'ensuit une étude du polyhèdre de notre formulation la plus forte qui montre sa proximité entre l'enveloppe convexe des solutions entières de notre problème. Un algorithme de branch and cut et d'autres méthodes de résolution sont ensuite comparés. Les expérimentations qui montrent la puissance de nos méthodes s'appuient sur deux grandes familles d'instances. Les premières sont générées aléatoirement et les secondes proviennent de Beasley's OR-library. Ces expérimentations mettent en valeur la qualité de la borne obtenue par notre formulation.La seconde partie propose une formulation "set partitioning" avec un nombre exponentiel de variables. Dans ce chapitre, la formulation comporte des variables associées à un ensemble de demandes affectées à la même facilité selon l'ordre établi sur leurs distances correspondantes. Nous avons alors développé un algorithme de génération de colonnes pour la résolution de la relaxation continue de notre modèle mathématique. Cet algorithme est ensuite déployé au sein d'un Branch-and-Cut-and-Price afin de résoudre des instances de petites et moyennes tailles avec des temps compétitifs.La troisième partie présente l'analyse et la comparaison des différentes formulations du problème DOMP Monotone. Ces formulations combinent plusieurs manières de formuler l'ordre des éléments selon les moyennes pondérées en utilisant plusieurs programmes linéaires du polytope du p-median. Cette approche donne lieu à deux formulations performantes du DOMP sous l'hypothèse de monotonie des vecteurs lambda. Ces formulations sont comparées de manière théorique puis comparées à d'autres formulations valides pour le cas général du vecteur lambda. Une autre formulation est également proposée, elle exploite l'efficacité du caractère rationnel de la monotonie. Cette dernière permet de résoudre efficacement quelques instances où la monotonie a légèrement disparue. Ces formulations ont fait l'objet de plusieurs expérimentations dècrites dans ce manuscrit de thèse. Elles montrent que les formulations spécifiques permettent de résoudre des instances plus importantes que pour le cas général.
Este trabajo estudia en profundidad la estructura del problema disctreto de la mediana ordenada (DOMP, por su acrónimo en inglés) con el objetivo de definir nuevas formulaciones y algoritmos de resolución. Además, analizamos una interesante extensión del DOMP conocida como el problema monótono discreto de la mediana ordenada (MDOMP, de su acrónimo en inglés).Esta tesis se compone de tres grandes bloques.En primer lugar, se desarrolla un detallado estudio teórico y computacional. Se presentan varias formulaciones nuevas para el problema discreto de la mediana ordenada (DOMP) basadas en su similaridad con algunos problemas de secuenciación. Algunas de estas formulaciones requieren de un cosiderable menor número de restricciones para definir el problema respecto a algunas de las formulaciones previamente conocidas. Además, las cotas inferiores proporcionadas por las relajaciones lineales mejoran a las obtenidas con formulaciones previas de la literatura incluso sin reforzar la nueva formulación. También presentamos un estudio poliédrico del politopo de asignación de nuestra formulación más compacta mostrando su proximidad con la envolvente convexa de las soluciones enteras del problema. Se comparan algunos procedimientos de resolución, entre los que destacamos un algoritmo de ramificación y corte. Amplios resultados computacionales sobre dos familias de instancias -aleatoriamente generadas y utilizando la Beasley's OR-library- muestran la potencia de nuestros métodos para resolver el DOMP.En el segundo bloque, el problema discreto de la mediana ordenada es abordado con una formulación de particiones de conjuntos empleando un número exponencial de variables. Este capítulo desarrolla una nueva formulación en la que cada variable corresponde a un conjunto de puntos de demanda asignados al mismo servidor con la información de la posición obtenida de ordenar las distancias correspondientes. Utilizamos generación de columnas para resolver la relajación continua del modelo. Después, empleamos un algoritmo de ramificación, acotación y "pricing" para resolver a optimalidad tamaños moderados del DOMP en un tiempo computacional competitivo.Por último, el tercer bloque de este trabajo se dedica a analizar y comparar formulaciones para el problema monótono discreto de la mediana ordenada. Estas formulaciones combinan diferentes maneras de representar medidas de pesos ordenados de elementos utilizando programación lineal junto con el politopo de la $p$-mediana. Este enfoque da lugar a dos formulaciones eficientes para el DOMP bajo la hipótesis de monotonía en su vector $lambda$. Se comparan teóricamente las formulaciones entre sí y frente a algunas de las formulaciones válidas para el caso general. Adicionalmente, se desarrolla otra formulación válida para el caso general que explota la eficiencia de las ideas de la monotonicidad. Esta representación permite resolver eficientemente algunos ejemplos donde la monotonía se pierde ligeramente. Finalmente, llevamos a cabo un detallado estudio computacional, en el que se aprecia que las formulaciones ad hoc permiten resolver a optimalidad ejemplos cuyo tamaño supera los límites marcados en al caso general.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Lancaster, Joseph Paul Jr. "Predicting the behavior of robotic swarms in discrete simulation". Diss., Kansas State University, 2015. http://hdl.handle.net/2097/18980.
Pełny tekst źródłaDepartment of Computing and Information Sciences
David Gustafson
We use probabilistic graphs to predict the location of swarms over 100 steps in simulations in grid worlds. One graph can be used to make predictions for worlds of different dimensions. The worlds are constructed from a single 5x5 square pattern, each square of which may be either unoccupied or occupied by an obstacle or a target. Simulated robots move through the worlds avoiding the obstacles and tagging the targets. The interactions between the robots and the robots and the environment lead to behavior that, even in deterministic simulations, can be difficult to anticipate. The graphs capture the local rate and direction of swarm movement through the pattern. The graphs are used to create a transition matrix, which along with an occupancy matrix, can be used to predict the occupancy in the patterns in the 100 steps using 100 matrix multiplications. In the future, the graphs could be used to predict the movement of physical swarms though patterned environments such as city blocks in applications such as disaster response search and rescue. The predictions could assist in the design and deployment of such swarms and help rule out undesirable behavior.
Baraklianos, Ioannis. "The accessibility in Land-Use Transport Interaction models : four essays on location choice models". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE2037/document.
Pełny tekst źródłaThis PhD thesis has as objective to examine the place and the importance of accessibility in location choice models of households and firms, two key construction elements of Land-Use Transport Interaction models. More specifically, the aim is to analyse the effect of various methodological choices from a theoretical and empirical point of view in order to give some answers to theoretical, methodological, empirical and policy issues. Having as a case study the urban area of Lyon and using discrete models to explain the location choices of households and firms, four research papers comprise the main work of this dissertation.In the first paper, the objective was to analyse the effect of the accessibility measure on the results of residential location choice model. While accessibility has always been important at theoretical level, at empirical level, some works questioned its importance, considering other location characteristics as more influential. This paper examines whether different accessibility measurement methods can lead to divergent results. The conclusion is that accessibility is an indispensable variable for residential location choice models and the conclusion remains the same whatever is the measure. Without accessibility, the model gives inconsistent results. Complex accessibility measures give better results, especially for predictions, but simple measures are also relevant for residential location choices modelling.In the second paper, the objective was to analyse the differences of accessibility preferences between new and relocating firms. Accessibility is one of the most important attributes of a location choice of an economic establishment. However, even if it seems intuitive, works analysing any differences between creations and relocations are scarce. Using data from eighteconomic sectors and comparing creations to relocations, the results demonstrate that the effect of accessibility differs between in the same economic sector.In the third paper, the objective was to evaluate the difference of the accessibility impact on the location choices of firms of the business services sector. Distinguishing between Front Office and Back Office business services in a location choice model, the results demonstrate that the effect of accessibility differs between economic subsectors.In the fourth paper, the objective was to analyse the temporal evolution of the preferences for accessibility for residential choices. More and more people choose to buy a residence at the suburbs taking advantage of the accessibility increase. At the same time, young households, the so called millennials, choose to rent in central areas. Distinguishing between renters andowners, the analysis of the elasticities for 1999, 2006 and 2013 confirm the initial intuition. Renters were always more sensitive to accessibility to employment. More importantly, renters show an increasing preference for accessibility during the analysis period, while the owners the opposite. We suggest that planners and model developers should integrate temporal dynamics into their models in order to anticipate better future tendencies
Posta, Marius. "« Resolution Search » et problèmes d’optimisation discrète". Thèse, Avignon, 2012. http://hdl.handle.net/1866/8393.
Pełny tekst źródłaThe combinatorial nature of discrete optimization problems often makes them diffi- cult to solve. Consider for instance integer linear programming problems, which are commonly solved using a Branch-and-Bound approach. An alternative approach, Resolution Search, was proposed by Chvátal in 1997 for solving 0-1 optimization problems, but remains little known to this day and as such has seen few practical applications. This thesis attempts to remedy this state of affairs, with partial success. Its first contribution consists in the generalization of Resolution Search to any discrete optimization problem, while introducing new definitions and concepts. Next, we tried to validate this approach by attempting to solve well-known problems efficiently with it. Although our research did not succeed in this respect, it lead us to new methods for solving the generalized assignment and uncapacitated facility location problems. After presenting these methods, this thesis concludes with a summary of our attempts at practical application of Resolution Search, along with further perspectives on this matter.
Thèse réalisée en cotutelle avec l'Université d'Avignon.
Rasciute, Simona. "The investment location choices of multinational enterprises in Central and Eastern Europe : the multi-level data and discrete choice methodology approach". Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/8134.
Pełny tekst źródłaAlmeida, Diony José de. "Proposta de um sistema de simulação e diagnóstico de falhas aplicado a um sistema de produção". Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1397.
Pełny tekst źródłaThis work we presents a proposal a software of simulation and fault diagnosis applied to an automation system. In that task was developed , a case study that contains a problem of industrial automation. The study was used as the source for creating the simulation that follows the specifications of software models, where you can observe the evolution of events through its language and diagnose faults when they occur in one of the machines of the plant. The process of fault diagnosis is based on the rules of diagnosticabilidades presented in the literature. The machines, as well as its restrictions are modeled within the software itself, where the structures of each automaton are defined the caracteristics as observability an the possibility of failure. The tests in the system showed that of the language used can allowing identify fails, checking only for events that occorem after the occurence the fails.
Maddah, Bacel. "Pricing, Variety, and Inventory Decisions in Retail Operations Management". Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/26298.
Pełny tekst źródłaPh. D.
Nilsson, Linnea, i Linnea Tiensuu. "Optimization of Storage Categorization : A simulation based study of how categorization strategies affect the order fulfillment time in a multi-picker warehouse". Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-148537.
Pełny tekst źródła三輪, 富生, Tomio MIWA, 俊行 山本, Toshiyuki YAMAMOTO, 高行 森川 i Takayuki MORIKAWA. "駐車場所-駐車時間選択行動への離散-連続選択モデルの適用と駐車料金施策分析". 日本都市計画学会, 2008. http://hdl.handle.net/2237/10026.
Pełny tekst źródłaFurió, Pruñonosa Salvador. "Modelos y métodos avanzados para la logística del contenedor. Aplicación al Puerto de Valencia". Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/63248.
Pełny tekst źródła[ES] Desde su aparición en los años 50, el contenedor marítimo ha revoluciona-do el transporte internacional de mercancías dando soporte a un sistema global de producción, marcado por la multilocalización de las industrias en busca de ventajas competitivas y la configuración de cadenas de suministro cada vez más complejas y globales. En este contexto, el contenedor ha adquirido un gran protagonismo convirtiéndose en un elemento logístico básico en las cadenas de suministro en las que actúa como unidad de transporte, producción y distribución. El éxito del contenedor queda puesto de manifiesto al analizar la evolución del tráfico portuario de contenedores, que ha estado creciendo a ritmos superiores al 10 %, superando los 600 millones TEU desde 2012. El contenedor es, por tanto, un elemento clave de las cadenas de suministro globales y la logística del contenedor es un área de estudio y trabajo de enorme interés por el impacto que tiene en la eficiencia de dichas cadenas, por el coste que supone a navieras y operadores en sus cuentas de explotación (coste que se traslada al usuario final y repercute en el precio de las mercancías transportadas) y por el coste social y ambiental asociado a las externalidades del transporte derivadas de esta gestión de la flota de contenedores. La logística del contenedor tiene que ver con la gestión eficiente del parque de contenedores, minimizando los costes de transporte, almacenamiento y mantenimiento, y maximizando la utilización del equipo. En la logística del contenedor se pueden identificar, por lo general, dos categorías o niveles diferenciados en función del ámbito geográfico y de los modos de transporte implicados: El nivel internacional y el nivel local o regional. Este trabajo aborda la logística del contenedor a nivel regional o local, es decir, en lo relativo a la gestión del stock, transporte y movimientos interiores, tratando de dar respuesta y plantear soluciones a algunos de los problemas con los que se encuentra el sector logístico-portuario en la actualidad. El resultado de la investigación permite, en primer lugar, conocer de una forma integral y estructurada la complejidad de la logística del contenedor marítimo. En segundo lugar, se identifican y abordan problemas específicos reales para su modelización y análisis, que permiten contribuir a la mejora del sistema logístico actual. En concreto se abordan los siguientes problemas: -Problemas de elección modal en la configuración de las cadenas o corredores logísticos interiores en el transporte de contenedores marítimos. -Problemas de localización o vertebración de una red de infraestructuras nodales para atender las necesidades logísticas de los contenedores marítimos. -Problemas asociados a los movimientos en vacío y gestión de contenedores marítimos. El interés y contribución académica de este trabajo reside tanto en la definición y modelización de los problemas específicos con una profunda discusión teórica, como en la aplicación empírica a situaciones y entornos reales, cosa que ha sido posible gracias al contacto directo del autor con el sector logístico-portuario y su participación en numerosos proyectos de consulto-ría e investigación tanto en el clúster del Puerto de Valencia como a nivel europeo e internacional. El trabajo se plantea como una colección de seis artículos científicos. El orden en que están situados los artículos en la tesis permite mantener una secuencia lógica construida a posteriori y no según el orden cronológico en el que fueron publicados.
[CAT] Des del seu naixement als anys 50, el contenidor marítim ha revolucionat el transport internacional de mercaderies donant suport a un sistema global de producció, marcat per la multilocalització de les indústries en busca d'avantatges competitives i la configuració de cadenes de subministrament cada vegada més complexes i globals. En aquest context, el contenidor ha adquirit un gran protagonisme convertintse en un element logístic bàsic en les cadenes de subministrament en les quals actua com a unitat de transport, producció i distribució. L'èxit del contenidor s'evidencia en analitzar l'evolució del tràfic portuari de contenidors, que ha estat creixent a ritmes superiors al 10 % superant els 600 milions TEU des de 2012. El contenidor és, per tant, un element clau de les cadenes subministrament globals i la logística del contenidor és un àrea d'estudi i treball d'enorme interès per l'impacte que té en l'eficiència d'aquestes cadenes, pel cost que suposa a navilieres i operadors en els seus comptes d'explotació (cost que es trasllada a l'usuari final i repercuteix en el preu de les mercaderies transportades) i pel cost social i ambiental associat a les externalitats del transport derivades d'aquesta gestió de la flota de contenidors. La logística del contenidor té a veure amb la gestió eficient del parc de contenidors, minimitzant els costos de transport, emmagatzematge i manteniment, i maximitzant la utilització de l'equip. En la logística del contenidor es poden identificar, en general, dues categories o nivells diferenciats en funció de l'àmbit geogràfic i de les modalitats de transport implicats: el nivell internacional i el nivell local o regional. Aquest treball aborda la logística del contenidor a nivell regional o local, és a dir, quant a la gestió de l'estoc, transport i moviments interiors, tractant de donar resposta i plantejar solucions a alguns dels problemes amb els quals es troba el sector logístic-portuari en l'actualitat. El resultat de la recerca permet, en primer lloc, conèixer d'una forma integral i estructurada la complexitat de la logística del contenidor marítim. En segon lloc, s'identifiquen i aborden problemes específics reals per a la seua modelització i anàlisi, que permeten contribuir a la millora del sistema logístic actual. En concret s'aborden els següents problemes: -Problemes d'elecció modal en la configuració de les cadenes o corredors logístics interiors en el transport de contenidors marítims. -Problemes de localització o vertebració d'una xarxa d'infraestructures nodals per a atendre les necessitats logístiques dels contenidors marítims. -Problemes associats als moviments en buit i gestió de contenidors marítims. L'interès i contribució acadèmica d'aquest treball resideix tant en la definició i modelització dels problemes específics amb una profunda discussió teòrica, com en l'aplicació empírica a situacions i entorns reals, cosa que ha sigut possible gràcies al contacte directe de l'autor amb el sector logístic-portuari i la seua participació en nombrosos projectes de consultoria i recerca tant en el clúster del Port de València com a nivell europeu i internacional. El treball es planteja com una col·lecció de sis articles científics. L'ordre en què estan situats els articles en la tesi permet mantenir una seqüència lògica construïda a posteriori i no segons l'ordre cronològic en el qual van ser publicats.
Furió Pruñonosa, S. (2016). Modelos y métodos avanzados para la logística del contenedor. Aplicación al Puerto de Valencia [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/63248
TESIS
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/.
Pełny tekst źródłaThis 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.
Zuo, Jian. "The Frequency Monitor Network (FNET) Design and Situation Awareness Algorithm Development". Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26721.
Pełny tekst źródłaPh. D.
Pounds, Andrew J. "A generalized discrete dynamical search method for locating minimum energy molecular geometries". Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/27144.
Pełny tekst źródłaHolmes, Kristin Renee Stone. "Locating-Domination in Complementary Prisms". Digital Commons @ East Tennessee State University, 2009. https://dc.etsu.edu/etd/1871.
Pełny tekst źródłaLane, Stephen M. "Trees with Unique Minimum Locating-Dominating Sets". Digital Commons @ East Tennessee State University, 2006. https://dc.etsu.edu/etd/2196.
Pełny tekst źródłaRyberg, Albin. "Optimisation of hauling schedules and passing bay locations in underground mines using a time-discrete mathematical model". Thesis, Linköpings universitet, Optimeringslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-169826.
Pełny tekst źródłaCyganski, Rita. "Was zieht uns an? Empirische Grundlagen für eine verbesserte Abbildung der Einkaufszielwahl in Verkehrsnachfragemodellen". Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/22101.
Pełny tekst źródłaA major challenge in travel demand modelling is the correct representation of decision patterns underlying the choice of destinations. This choice determines the spatial structures of demand and is closely related to central modelling results. Around one third of everyday trips in Germany are for shopping and errands. Numerous studies show the importance of habitualised behavioral patterns when choosing a shopping location. The motives for choosing a shop are considered to be very diverse. Particular importance is attributed to primary activity locations. Nevertheless, the representation of the target choice in demand modelling is usually very simplified. Usually, a supply purchase is implicitly assumed, with the size of the shop and travel time from the previous location being the most important choice criteria. Using empirical analyses, this dissertation shows possibilities for a behavior-oriented depiction of shopping location choice in microscopic passenger transport models. These are discussed in terms of their usability for modeling. The analyses focus on the variability of destinations, the decisive motives and the spatial reference points of the location search. Using the example of the purchase of food and beverages, textiles and consumer electronics, differences between shopping goods of different periodicity and also different groups of people are presented. Simulation calculations with the demand model TAPAS show that a differentiation of the type of purchase and the use of a motive-based accessibility measure greatly improves the modelling results. The dissertation provides extended indicators for a consideration of spatial reference points in the evaluation of the modelling results. Furthermore, the analyses of activity areas, diversion factors, the location of shopping locations and cumulative travel distances provide information that can be generally used to define adequate search areas and reference points for the modelling of urban study areas.Einkaufsverhalten
Giacometti, Romain. "Détection et localisation des signaux radar (systèmes passifs ou discrets)". Thesis, Brest, 2017. http://www.theses.fr/2017BRES0083.
Pełny tekst źródłaThe purpose of this work is to develop new methods for the detection and the location of radar sources. The developed approach exploits the direct and indirect signals received at the receiving point. In our study, we first develop a model of these signals that takes into account the characteristics of the transmitters and the reflectors. We evaluate this model by simulating a particular case of reflectors detection and location, defined in the literature. Our goal is to use the multipaths to locate emission sources. Most existing methods are based on specular reflections. Methods based on non-specular reflections, to locate emission sources in an unknown environment, are rarely studied in the literature. In our study, we propose a new location method that uses a fixed receiver measuring the Angle of Arrival (AOA) and Time Difference of Arrival (TDOA). In practice, an assignment problem must be solved before locating the emitters and reflectors. The problem is to assign each pair of TDOA-AOA measurements to a given reflector, assuming that each pair has already been assigned to a transmitter. The method developed has been tested and evaluated by using simulated data and real measurements
Moore, Darren N. "Mixed Multinomial Logit Analysis of Bicyclist Injury-severity in Single Motor Vehicle Crashes Based on Intersection and Non Intersection Locations". University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1247599441.
Pełny tekst źródłaHomocianu, George Marius. "Modélisation de l’interaction transport-urbanisme : choix résidentiels des ménages dans l’aire urbaine de Lyon". Thesis, Lyon 2, 2009. http://www.theses.fr/2009LYO22001/document.
Pełny tekst źródłaThe objective of the thesis is to propose a modeling of the residential behaviors of the households: the choice of change of residence (or removal), and the choice of the new location. This type of models aims at envisaging the probability that a household changes residence and its choice of new location, according to a certain number of explanatory variables. In our case, modeling is founded on the discrete choice theory (random utility approach). Research is based on the Lyons case, the model being built on the urban area of Lyon, on data of the year 1999. In terms of results, side of residential mobility, it should be retained that the variables which explain the variation of the degree of mobility (of the rate of removal) of the households are the age of head, the number of children and the statute of occupation of housing. With regard to the households location, the preferences of the households for a zone are related on the characteristics of those and particularly to accessibility on various opportunities and services, which confirms that among the factors which influence the location behavior of the households one finds accessibilities, and thus, the assumption of the existence of a relation between transport and land use. It was also found that the characteristics of the households like age of head, income or household size have an influence on their location choices. The study and the results of the models suggest that improvements and new directions of research are possible. Thus, on the side of residential mobility, there could be other variables which justify the housing change, like characteristics of the residence, residential environment or other characteristics of the households not observed. It would be also interesting to estimate the location model at a finer geographical level (îlot). Other alternatives of modeling of the residential decisions of the households would be to model a hierarchical structure of the choices, by a hierarchical or nested logit, or to model the life cycle, whit its components family, residential and professional, which are in interdependence (in condition of availability of necessary data)
Aissaoui, Hind. "Choix de localisation résidentielle des ménages en milieu urbain : les apports récents des modèles de choix discrets en présence d'un nombre élevé d'alternatives". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE2093/document.
Pełny tekst źródłaThis thesis, focusing on the choice of residential location, is based on the theoretical framework of urban micro-economy and random utility. Though discrete choice modelling is the most appropriate in this field, the difficulty lies in choosing the appropriate model to the spatial context of residential location choice (spatial autocorrelation, large number of alternatives), on the one hand, and in the way of defining the spatial scale, on the other hand. For this purpose, we proceeded in two stages. We estimated a multinomial logit with random sampling of alternatives to understand the process of residential location choice before taking into account the spatial autocorrelation, and estimating a nested logit model. It also allowed to investigate the feasibility of applying a new method to correct biases of sampling alternatives in the case of nested logit model. In terms of results, we have shown that social environment are the most important determinants of residential location choice. Though job accessibility still weigh on household choice decision. In terms of methodology, we were able to test the feasibility of estimating a nested logit model with sampling of alternatives to analyze the choice of location of Lyon urban area. However, we could not overcome the difficulty of distinguishing spatial autocorrelation from nesting. The use of 1999 and 2007 databases to model residential location choice also helped to provide answers on the temporal transferability of location choice models and discuss in future work the predictive power of a location choice model
Pehlivan, Canan. "Design and flow control of stochastic health care networks without waiting rooms : A perinatal application". Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2014. http://tel.archives-ouvertes.fr/tel-00994291.
Pełny tekst źródłaChung, Lan-kun, i 衷嵐焜. "Study of applying Discrete Location Model to fast-food delivery store location choice". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/61299115860479507028.
Pełny tekst źródła國立中央大學
土木工程學系
84
In urban areas of Taiwan, land price per square meter for retailing stores could be as high as 200 thousand NT dollars, about a half of annual personal income per capita in Taiwan area. In combination with consumption pattern characterized by mixed land uses, the high land values push operation of western fast-food chain-stores switch their major business to non-store retailing . In the research , our attempt is to formulate discrete location model to evaluate the aforementioned non-store retailer with the objective of maximizing profit. Site selection for Pizza delivery store is the case for empirical study. To assist a decision-maker to make decision, GIS is employed to manage data and display spatial result.To the proposed discrete location model, Lagrangian Relaxation with Subgradient Method and Genetic Algorithm(GA) are chosen to solve. The former can converge to optimal solution in any small cases; on the other hand, the latter can converge to optimal solution not in all selected small cases. Empirical penalty functions are tested to simulate the constraints in the GA formulation and assist the model to approach optimality. However, the Lagrangian Relaxation with Subgradient Method converges very slowly in case that total number of facilities increase. GA, on the contrary, converges satisfactorily.
CHANG, WEN TIEN, i 張文田. "Formulations and Solution Method for Discrete Location Problem with Unreliable Facilities". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/32792526956187704502.
Pełny tekst źródłaChen, Yun-Ju, i 陳韻如. "Location Optimization of Battery Swapping Stations for Electric Scooters using Stochastic Discrete-event Simulation". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/x6cug3.
Pełny tekst źródła國立臺灣大學
土木工程學研究所
107
In recent years, along with raising environmental consciousness, an innovative transportation mode—electric vehicles have gotten many attentions. Because the power source of electric vehicles is electric power, a renewable and environmentally friendly energy, worldwide countries have been devoted to the popularization of electric vehicles and Taiwan is no exception. However, there are two principal challenges for the penetration of electric vehicles: the limited endurance of the mode and its expensive batteries. The limited endurance lets the user has to refuel the energy during a certain using period and the problem of range anxiety comes out. Hence, an auxiliary equipment—the refueling facility is necessary for electric vehicles and it is essential to locate the charger appropriately. Actually, there already are many types of refueling methods and one of the innovative and promising ways is the swapping system. The swapping system reduces the entire refueling time from original several hours to a few minutes or even seconds. This user-friendly advantage lets the user conducts the refueling on the road become much more possible but on the other side, this benefit also increases the need for spare batteries. Therefore, not only the location but also the capacity of swapping stations has to be cautiously determined by the operator. Nevertheless, it is thorny to decide where and how big the swapping station should be directly, so the purpose of this research is to develop a model for deploying the refueling facilities of the swapping system. In addition, because the most popularized transportation mode in Taiwan is scooters, the research object of this study is electric scooters. In order to enhance the applicability of the model and depict the usage behavior conveniently, the methodology adopted in this study combines the genetic algorithm and the discrete-event simulation forming a two-stage planning. In addition, considering the usage habits of the swapping system, the notion of flow interception is adopted in the model. After the sensitivity analysis of experiments, it is found that different parameters have diverse impacts on different shapes of demand spatial distribution. Regular spatial distribution is much more sensitive to the budget and the irregular one is sensitive to the power consumption rate of batteries. Noteworthily, a factor significantly influencing both the shape of demand distribution is the driving endurance. With the case study in the reality, some setting instructions for such a location problem have been obtained. The operator who is going to plan a layout for swapping stations should adopt the entire traffic “flow” rather than the traffic “zone”. Besides, the operator should give a locating priority to the station where is near heavy traffic flows regardless of the shape of demand distributions. Further, considering the user’s maximum tolerable driving distance for swapping, the operator should radially deploy the station taking origins and destinations as the center. Many important factors are considered in the model such as the demand uncertainty, driving endurance, the tolerance of the user, usage behavior and the varied charging power levels by charging time. This is the first time that a model takes these significant factors into account at the same time. What’s more, after the experiments and the case study, the utility and validity of the model are exhibited and these results also show the importance of considering usage behavior. Thus, this model can be a useful tool to help the operator to decide a proper deployment of swapping stations for electric scooters.
Mara, Setyo Tri Windras, i Setyo Tri Windras Mara. "SOLVING A MULTI-OBJECTIVE SUSTAINABLE LOCATION-ROUTING PROBLEM USING DISCRETE MULTI-OBJECTIVE SINE-COSINE ALGORITHM". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/59r5es.
Pełny tekst źródła國立臺灣科技大學
工業管理系
107
The location-routing problem (LRP) is an emerging area in logistics research which combines two well-known distribution planning tasks: facility location problem (FLP) and vehicle routing problem (VRP). The main goal of planning a distribution network is to obtain a minimum systemwide cost, which resembles companies’ economical objective. However, in order to achieve a more sustainable future, nowadays companies have to start to give attention to the sustainability issue, such as providing workload balance for their employees and producing less emission from their operational activities. The challenge arises because sustainability issue is potentially conflicting with companies’ economical objective. Therefore, an effort has to be made to find the optimal solution. Our literature review finds only limited works in LRP which have already addressed sustainability issue comprehensively. Thus, this study intends to present a multi-objective sustainable LRP to address this issue. The proposed model considers three objective functions: (1) to minimize the total cost associated with facility, vehicle, and distribution, (2) to balance the workload in distribution activities, and (3) to minimize CO2 emission from transportation activities. The main purposes of this model are to obtain the optimal location of distribution centers, a number of vehicles established, and delivery routes which satisfy all of these three objectives. In order to solve the model, this study implements a novel metaheuristic for multi-objective routing problem, namely the multi-objective sine-cosine algorithm (MOSCA). The algorithm is modified with a simple discretization technique to deal with discrete search space. Then, the performance of the proposed algorithm is evaluated with several test instances and applied to solve a real world case study in Daerah Istimewa Yogyakarta, Indonesia. The results are compared to three classical metaheuristics, namely non-dominated sorting genetic algorithm-II (NSGA-II), multi-objective particle swarm optimization (MOPSO), and Pareto archived evolution strategy (PAES). The experimental results indicate that, based on five comparison metrics, MOSCA performs better than the other algorithms.
Bishop, Kelly Catherine. "Location Choice and the Value of Spatially Delineated Amenities". Diss., 2008. http://hdl.handle.net/10161/656.
Pełny tekst źródłaIn the first chapter of this dissertation, I outline a hedonic equilibrium model that explicitly controls for moving costs and forward-looking behavior. Hedonic equilibrium models allow researchers to recover willingness to pay for spatially delineated amenities by using the notion that individuals "vote with their feet." However, the hedonic literature and, more recently, the estimable Tiebout sorting model literature, has largely ignored both the costs associated with migration (financial and psychological), as well as the forward-looking behavior that individuals exercise in making location decisions. Each of these omissions could lead to biased estimates of willingness to pay. Building upon dynamic migration models from the labor literature, I estimate a fully dynamic model of individual migration at the national level. By employing a two-step estimation routine, I avoid the computational burden associated with the full recursive solution and can then include a richly-specified, realistic state space. With this model, I am able to perform non-market valuation exercises and learn about the spatial determinants of labor market outcomes in a dynamic setting. Including dynamics has a significant positive impact on the estimates of willingness to pay for air quality. In addition, I find that location-specific amenity values can explain important trends in observed migration patterns in the United States.
The second chapter of this dissertation describes a model which estimates willingness to pay for air quality using property value hedonics techniques. Since Rosen's seminal 1974 paper, property value hedonics has become commonplace in the non-market valuation of environmental amenities, despite a number of well-known methodological problems. In particular, recovery of the marginal willingness to pay function suffers from important endogeneity biases that are difficult to correct with instrumental variables procedures [Epple (1987)]. Bajari and Benkard (2005) propose a "preference inversion" procedure for recovering heterogeneous measures of marginal willingness to pay that avoids these problems. However, using cross-sectional data, their approach imposes unrealistic constraints on the elasticity of marginal willingness to pay. Following Bajari and Benkard's suggestion, I show how data describing repeat purchase decisions by individual home buyers can be used to relax these constraints. Using data on ozone pollution in the Bay Area of California, I find that endogeneity bias and flexibility in the shape of the marginal willingness to pay function are both important.
Finally, in the third chapter of this dissertation, I combine the insights of the Bajari-Benkard inversion approach employed in second chapter with more standard estimation techniques (i.e., Rosen (1974)) to arrive at a new hedonic methodology that allows for flexible and heterogeneous preferences while avoiding the endogeneity problems that plague the traditional Rosen two-stage model. Implementing this estimator using the Bay Area ozone data, I again find evidence of considerable heterogeneity and of endogeneity bias. In particular, I find that a one unit deterioration in air quality (measured in days in which ozone levels exceed the state standards) raises marginal willingness to pay by $145.18 per year. The canonical two-stage Rosen model finds, counter-intuitively, that this same change would reduce marginal willingness to pay by $94.24.
Dissertation
Jung, Inyeop. "Geometric location and power distribution for discrete heat sources on a vertical flat plate with natural convection". Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-3750.
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Khuong, Paul Virak. "Lagrangian-informed mixed integer programming reformulations". Thèse, 2013. http://hdl.handle.net/1866/10538.
Pełny tekst źródłaInteger linear programming is a robust and efficient approach to solve large-scale instances of combinatorial problems. However, problems constantly gain in complexity and sometimes impose strong constraints on computation times. We must then develop specialised methods to compute heuristic primal solutions to the problem and derive lower bounds on the optimal value, and thus prove the quality of our primal solutions. We propose to guide a reformulation approach for mixed integer programs with Lagrangian relaxations. After the identification of a strong relaxation, a mechanical process leads to a second integer formulation. This reformulation is equivalent to the initial one, but its linear relaxation is equivalent to the strong Lagrangian dual. We will show that the reformulation approach unifies and generalises prior formulations and lower bounding approaches, and that it exposes a simple mechanism to reduce the size of reformulations in return for weaker bounds. Nevertheless, our reformulations are large. We address this issue by solving their linear relaxations with specialised methods. Finally, we apply the reformulation approach to two location problems. This yields novel formulations for both problems; some are very large but, thanks to the aforementioned specialised methods, still practical.
Dutta, Rajdeep. "Evolutionary Optimization For Vibration Analysis And Control". Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2281.
Pełny tekst źródłaDutta, Rajdeep. "Evolutionary Optimization For Vibration Analysis And Control". Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2281.
Pełny tekst źródła于善淳. "On the free vibration of rotating annular plates elastically restrained at discrete locations". Thesis, 1989. http://ndltd.ncl.edu.tw/handle/86044475041058252099.
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