A cotangent bundle Hamiltonian tube theorem and its applications in reduction theory 

    Teixidó Roman, Miguel (Date of defense: 2015-03-27)

    The Marle-Guillemin-Sternberg (MGS) model is an extremely important tool for the theory of Hamiltonian actions on symplectic manifolds. It has been extensively used to prove many local results both in symplectic geometry ...

    A network approach for strapdown inertial kinematic gravimetry 

    Termens Perarnau, Maria Assumpció (Date of defense: 2014-03-07)

    Compared to the conventional ground measurement of gravity, airborne gravimetry is more efficient and cost-effective. Especially, the combination of GPS and INS is known to show very good performances recovering the gravity ...

    Aplicaciones de la teoría de grafos al diseño de redes de interconexión de multiprocesadores 

    Fiol Mora, Miguel Ángel (Date of defense: 1982-01-01)

    En este trabajo se estudia, mediante la Teoría de Grafos, el diseño de redes de interconexión para sistemas distribuidos. Los principales temas tratados son: 1. Se propone una metodología general para la obtención de redes ...

    Contribucions a la teoria de l'aresta-acoloriment de grafs : snarks i multipols 

    Vilaltella Castanyer, Joan, 1969- (Date of defense: 2015-07-14)

    A graph where every vertex has three neighboring vertices is a cubic graph. An edge-coloring is an assignment of colors to the edges of a graph in such a way that the edges incident to a vertex have no repeated colors. An ...

    Contributions to secret sharing and other distributed cryptosystems 

    Ruiz Rodriguez, Alexandre (Date of defense: 2013-07-22)

    The present thesis deals with primitives related to the eld of distributed cryptography. First, we study signcryption schemes, which provide at the same time the functionalities of encryption and signature, where the ...

    Contributions to the 3D ionospheric sounding with GPS data 

    García Fernández, Miquel (Date of defense: 2004-03-15)

    La tesi proposa una sèrie d'algoritmes destinats a obtenir informació del contingut d'electrons lliures presents a la ionosfera. El tipus de dades que s'utilitzaran seran bàsicament les corresponents a receptors de dades ...

    Descomposicions de grafs en arbres. 

    López Masip, Susana-Clara (Date of defense: 2003-02-20)

    Digrafs línia: alguns aspectes en comunicacions: Broadcasting i Vulnerabilitat. 

    Muñoz López, Xavier (Date of defense: 1996-12-05)

    El objetivo de la tesis es el estudio de diversosaspectos de redes de interconexión que pueden sermodeladas mediante la teoría de grafos, y masconcretamente, mediante dígrafos línea iterados enparticular se presentan, para ...

    Geometrical structures of higher-order dynamical systems and field theories 

    Prieto Martínez, Pere Daniel (Date of defense: 2014-10-02)

    Geometrical physics is a relatively young branch of applied mathematics that was initiated by the 60's and the 70's when A. Lichnerowicz, W.M. Tulczyjew and J.M. Souriau, among many others, began to study various topics ...

    Improvements in autonomous GPS navigation of Low Earth Orbit satellites 

    Ramos Bosch, Pedro (Date of defense: 2008-10-24)

    Es defineix un satèl·lit d'òrbita baixa aquell que es troba a una alçada de fins a 2000 km per sobre de la superfície de la Terra. Degut al ràpid decaïment dels objectes propers a la superfície degut al fregament atmosfèric, ...

    Magic graphs 

    Muntaner Batlle, Francesc Antoni (Date of defense: 2001-11-29)

    DE LA TESIS<br/>Si un graf G admet un etiquetament super edge magic, aleshores G es diu que és un graf super edge màgic. La tesis està principalment enfocada a l'estudi del conjunt de grafs que admeten etiquetaments super ...

    Multipartite secret sharing schemes 

    Farràs Ventura, Oriol (Date of defense: 2010-07-27)

    This thesis is dedicated to the study of secret sharing schemes, which are cryptographic methods to share information in a secure way. The topics that are considered in the thesis are two of the main open problems in secret ...

    Optimization in graphs under degree constraints. application to telecommunication networks 

    Sau Valls, Ignasi (Date of defense: 2009-10-16)

    La premi ere partie de cette th ese s'int eresse au groupage de tra c dans les r eseaux de t el ecommunications. La notion de groupage de tra c correspond a l'agr egation de ux de faible d ebit dans des conduits de ...

    Problemas Geométricos en Morfología Computacional 

    Claverol Aguas, Mercè (Date of defense: 2004-07-16)

    Esta tesis se divide en dos partes. La primera parte contiene el estudio de tres pesos o profundidades, asociados a conjuntos finitos de puntos en el plano: el peso definido por las capas convexas, convex depth (introducido ...

    Random combinatorial structures with low dependencies : existence and enumeration 

    Perarnau Llobet, Guillem (Date of defense: 2013-10-01)

    En aquesta tesi s'estudien diferents problemes en el camp de la combinatòria i la teoria de grafs, utilitzant el mètode probabilístic. Aquesta tècnica, introduïda per Erdős , ha esdevingut una eina molt potent per tal de ...

    Some contributions from graph theory to the design and study of large and fault-tolerant interconnection networks 

    Pelayo Melero, Ignacio Manuel (Date of defense: 2000-03-13)

    Esta tesis trata diversas cuestiones relacionadas con el diseño y estudio de redes de interconexión densas y fiables. Concretamente en ella se han incluido cuatro grupos de contribuciones. En primer lugar se presenta una ...

    Some Digital Signature Schemes with Collective Signers 

    Herranz Sotoca, Javier (Date of defense: 2005-04-15)

    Digital signatures are one of the most important consequences of the appearance of public key cryptography, in 1976. These schemes provide authentication, integrity and non-repudiation to digital communications. <br/>Some ...

    The Removal Lemma: algebraic versions and applications 

    Vena Cros, Lluís (Date of defense: 2012-07-02)

    This thesis presents some contributions in additive combinatorics and arithmetic Ramsey theory. More specifically, it deals with the interaction between combinatorics, number theory and additive combinatorics. This area ...

    Una Formalització de les construccions geomètriques 

    Tramuns Figueras, Eulàlia (Date of defense: 2012-07-18)

    Geometric constructions have been studied by mathematicians from ancient Greece until now. Although most attention has been given by the ruler and compass, during the last decades interest in this subject has revived, and ...