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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...