Browsing by Subject "Mathematical models"

Now showing items 1-20 of 184

    • A comprehensive dynamic model for class-1 tensegrity systems based on quaternions 

      Cefalo, Massimo; Mirats Tur, Josep Maria (2011)
      Article
      Open Access
      In this paper we propose a new dynamic model, based on quaternions, for tensegrity systems of class-1. Quaternions are used to represent orientations of a rigid body in the 3-dimensional space eliminating the problem of ...

    • A conductance electrical model for representing and matching weighted undirected graphs 

      Igelmo Ganzo, Manuel; Sanfeliu Cortés, Alberto; Ferrer Sumsi, Miquel (2010)
      Conference report
      Open Access
      In this paper we propose a conductance electrical model to represent weighted undirected graphs that allows us to efficiently compute approximate graph isomorphism in large graphs. The model is built by transforming a graph ...

    • A dynamic fitting strategy for physiological models: a case study of a cardiorespiratory model for the simulation of incremental aerobic exercise 

      Sarmiento Pérez, Carlos Andrés; Hernández Valdivieso, Alher Mauricio; Mañanas Villanueva, Miguel Ángel; Serna Higuita, Leidy Yanet (Multidisciplinary Digital Publishing Institute (MDPI), 2024-04-11)
      Article
      Open Access
      Using mathematical models of physiological systems in medicine has allowed for the development of diagnostic, treatment, and medical educational tools. However, their complexity restricts, in most cases, their application ...

    • A Formal Verification and Validation of a Low Magnetic Reynolds Number MHD Code for Fusion Applications 

      Suárez Cambra, Daniel; Khodak, Andrei; Mas de les Valls Ortiz, Elisabet; Batet Miracle, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2022-01-01)
      Article
      Open Access
      As the nuclear fusion research advances, resear-chers and engineers focus more on the design of the required systems that complement the nuclear fusion reaction in the plasma of a Tokamak. Some proposals for breeding ...

    • A general framework for softening regularisation based on gradient elasticity 

      Rodríguez Ferran, Antonio; Bennet, Terry; Askes, Harm; Tamayo Mas, Elena (2011-05-01)
      Article
      Open Access
      A general non-local approach to regularise strain-softening continua is presented. The key idea is to introduce the gradient-type enrichment at the level of displacements (rather than some internal variable), so the model ...

    • A generalization of the Caginalp phase-field system based on the Cattaneo law 

      Miranville, Alain; Quintanilla de Latorre, Ramón (Elsevier, 2009)
      Article
      Restricted access - publisher's policy
      We consider in this article a generalization of the Caginalp model for phase transitions based on the Maxwell Cattaneo law, instead of the classical Fourier law. In particular, we prove the existence and uniqueness of ...

    • A mathematical model for dynamic memory networks 

      Fàbrega Canudas, José; Fiol Mora, Miquel Àngel; Serra Albó, Oriol; Andrés Yebra, José Luis (Iniciativa Digital Politècnica, 2011)
      Conference report
      Open Access
      The aim of this paper is to bring together the work done several years ago by M.A. Fiol and the other authors to formulate a quite general mathematical model for a kind of permutation networks known as dynamic memories. A ...

    • A mathematical model for the energy stored in green roofs 

      Aguareles Carrero, María; Calvo Schwarzwälder, Marc; Font Martínez, Francesc; Myers, Timothy G. (2023-03-13)
      Article
      Open Access
      A simple mathematical model to estimate the energy stored in a green roof is developed. Analytical solutions are derived corresponding to extensive (shallow) and intensive (deep) substrates. Results are presented for the ...

    • A mathematical model of carbon capture by adsorption 

      Font Martínez, Francesc; Myers, Timothy; Hennessy, Matthew G. (2021-08-02)
      Part of book or chapter of book
      Restricted access - publisher's policy
      We present a model to describe the capture of carbon by an adsorbing porous material occupying a circular cross-section column. The model consists of an advection-reaction-diffusion equation for the gas concentration coupled ...

    • A mathematical perspective on how test-type exams are evaluated 

      Freixas Bosch, Josep; Pons Vallès, Montserrat (2020)
      Conference report
      Restricted access - confidentiality agreement
      Typically, the test type exams with binary answers (true / false) are corrected by adding a +1 to the correct answers, a -1 to the incorrect ones and 0 to non-answered questions. This mainly obeys to a purely statistic ...

    • A novel approach for hybrid performance modelling and prediction of large-scale computing systems 

      Pllana, Sabri; Benkner, Siegfried; Xhafa Xhafa, Fatos; Barolli, Leonard (2009)
      Article
      Restricted access - publisher's policy
      We present a novel approach for hybrid performance modeling and prediction of large-scale parallel and distributed computing systems, which combines mathematical modeling and discrete-event simulation. We use mathematical ...

    • A novel model to predict a slap avalanche configuration using m:n-CAk cellular automata 

      Fonseca Casas, Pau; Colls, Màxim; Casanovas Garcia, Josep (Elsevier, 2010-08-23)
      Article
      Restricted access - publisher's policy
      The paper introduces a novel method to represent slap avalanche phenomena. The model is based on a cellular automaton generalization named m:n-$CA^k$. This generalization allows the use of different layers in a single ...

    • A novel strategy to fit and validate physiological models: a case study of acardiorespiratory model for simulation of incremental aerobic exercise 

      Sarmiento, Carlos Andrés; Serna Higuita, Leidy Yanet; Hernández Valdivieso, Alher Mauricio; Mañanas Villanueva, Miguel Ángel (2023-03-01)
      Article
      Open Access
      Applying complex mathematical models of physiological systems is challenging due to the large number of parameters. Identifying these parameters through experimentation is difficult, and although procedures for fitting and ...

    • A recursive LMI-based algorithm for efficient vertex reduction in LPV systems 

      Sanjuan Gómez, Adrián; Rotondo, Damiano; Nejjari Akhi-Elarab, Fatiha; Sarrate Estruch, Ramon (2021-01-01)
      Article
      Open Access
      This paper proposes a new algorithm to reduce the number of gains of a polytopic LPV controller considering generic tuples of vertices, for which a common controller gain can be used. The use of Frobenius norm and the ...

    • A simple discrete simulation model to explore in the classroom some rules involved in the decision-making process: the cellular automata 

      Ginovart Gisbert, Marta (2013)
      Article
      Restricted access - publisher's policy
      The aim of this contribution is to pr esent teaching material elaborated to work with a very simple discrete model, the cellular automata called “Voting” (free access from the social science section of NetLogo ...

    • Advanced Spatial Temporal Regularization for Inverse Electrocardiography (ECG) 

      González Navarro, Paula (Universitat Politècnica de Catalunya, 2014-07-23)
      Bachelor thesis
      Open Access
      Covenantee:   Northeastern University
      [ANGLÈS] Heart diseases are the first cause of Mortality in the world. The percentage of the deceased who dies because of a cardiac infarction rises every year. Therefore, an early identification of typical signs may be ...

    • Algorithms for three-dimensional atmospheric simulations 

      Nadal Vila, Pau (Universitat Politècnica de Catalunya, 2021-09-28)
      Master thesis
      Open Access
      In this project, an atmospheric model based on the Navier-Stokes equations and the incorpo-ration of the Boussinesq’s approximation is introduced. The model is applicable to pseudo-incompressible adiabatic three-dimensional ...

    • An Approach to enhance efficiency of DEM modelling of soils with crushable grains 

      Ciantia, Matteo Oryem; Arroyo Alvarez de Toledo, Marcos; Calvetti, Francesco; Gens Solé, Antonio (Thomas Telford, 2015-02)
      Article
      Open Access
      In this study oedometric compression tests of hydrocarbon coke, Fontainebleau sand and silica sand are simulated in three dimensions using breakable particles. The method adapts a rigorous breakage criterion for elasto-brittle ...

    • An enriched finite element/level-set model for two-phase electrohydrodynamic simulations 

      Narváez Muñoz, Christian; Hashemi, Mohammad Reza; Ryzhakov, Pavel; Pons Prats, Jordi (2023-01-04)
      Article
      Open Access
      In this work, a numerical model for the simulation of two-phase electrohydrodynamic (EHD) problems is proposed. It is characterized by a physically consistent treatment of surface tension as well as a jump in the electric ...

    • An integrated mathematical model of the cardiovascular and respiratory response to exercise: Model-building and comparison with reported models 

      Sarmiento, Carlos Andrés; Hernández, Alher Mauricio; Serna Higuita, Leidy Yanet; Mañanas Villanueva, Miguel Ángel (2021-04-01)
      Article
      Open Access
      The use of physiological models in medicine allows the evaluation of new hypotheses, development of diagnosis and clinical treatment applications, and development of training and medical education tools, as well as medical ...