Now showing items 1-16 of 16

    • A Computational characterization of collective chaos 

      Delgado Pin, Jordi; Solé, Ricard Vicenç (1998-06)
      Research report
      Open Access
      We suggest that the interaction of a Globally Coupled Map (GCM) with an individual element inside the system is, from a computational point of view, indistinguishable of a mu,epsilon-dependent noise in the turbulent ...
    • Aprenentatge de la Programació al Citilab: Squeak i Scratch 

      Delgado Pin, Jordi (2008)
      Conference report
      Open Access
      Aquest article vol ser un recull de les primeres experiències al Citilab apropant la programació dels ordinadors a la gent del carrer. Sense cap requeriment previ, qualsevol pot inscriure's a algun dels cursos de la nostra ...
    • Emergence of social conventions in complex networks 

      Delgado Pin, Jordi (2001-07)
      Research report
      Open Access
      The emergence of social conventions in multi-agent systems has been analyzed mainly in settings where every agent may interact either with every other agent or with nearest neighbours, according to some regular underlying ...
    • Evidence of a noise induced transition in fluid neural networks 

      Delgado Pin, Jordi; Solé, Ricard Vicenç (1995-03)
      Research report
      Open Access
      Submitted to Physica D. Focusing on a phenomenon observed in the temporal patterns of activity behavior of Leptothorax ants, we introduce the notion of Noise Induced Computation. We study, from a Noise Induced Transition ...
    • Formulación numérica en elementos finitos de problemas de flujo multifásico no isotermo y transporte de solutos reactivos en medios porosos 

      Juncosa, Ricardo; Samper Calvete, Francisco Javier; Navarro, Vicente; Delgado Pin, Jordi (Universitat Politècnica de Catalunya, 2002)
      Article
      Open Access
      En este artículo se presenta la formulación numérica del flujo multifásico no isotermo y del transporte reactivo de un sistema multicomponente de solutos en condiciones no isotermas. El modelo numérico ha sido implementado ...
    • Mean field theory of fluid neural networks 

      Delgado Pin, Jordi; Solé, Ricard Vicenç (1997-06)
      Research report
      Open Access
      Fluid Neural Networks (FNN) are a mathematical framework where the phenomenon of self-synchronization in ant colonies can be explained, predicting the model a critical density, i.e. a density where oscillations appear, ...
    • Modelos de flujo multifásico no isotermo y transporte reactivo multicomponente en medios porosos : 1. formulación físico matemática 

      Juncosa, Ricardo; Samper Calvete, Francisco Javier; Navarro, Vicente; Delgado Pin, Jordi (Fundación para el Fomento de la Ingeniería del Agua, 2002-12)
      Article
      Open Access
      El diseño y construcción de almacenamientos de residuos tóxicos en formaciones geológicas poco permeables requiere disponer de herramientas que permitan predecir el comportamiento a largo plazo del sistema. Por ello, es ...
    • Neighborhood-based stopping criterion for contrastive divergence 

      Romero Merino, Enrique; Mazzanti Castrillejo, Fernando Pablo; Delgado Pin, Jordi (2018-07)
      Article
      Open Access
      Restricted Boltzmann Machines (RBMs) are general unsupervised learning devices to ascertain generative models of data distributions. RBMs are often trained using the Contrastive Divergence (CD) learning algorithm, an ...
    • On Collective Computation 

      Delgado Pin, Jordi (Universitat Politècnica de Catalunya, 1997-12-05)
      Doctoral thesis
      Open Access
    • Pattern formation and optimization in army ant raids 

      Solé, Ricard Vicenç; Bonabeau, Eric; Fernández, P.; Delgado Pin, Jordi; Marín Sánchez, Jesús (1999-12)
      Research report
      Open Access
      Army ant colonies display complex foraging raid patterns involving thousands of individuals communicating through chemical trails. In this paper we explore, by means of a simple search algorithm, the properties of these ...
    • Phase transitions and complex systems 

      Vicente Solé, Ricardo; Cuevas Manrubia, Susana; Bartolo, Luque; Delgado Pin, Jordi; Bascompte, Jordi (1995-10)
      Research report
      Open Access
      The applicability of concepts from the theory of critical phenomena and phase transitions to complex systems (in relation with the edge of chaos hypothesis) is discussed. Different types of phase transitions are defined ...
    • Self-synchronization and task fulfilment in ant colonies 

      Delgado Pin, Jordi; Solé, Ricard Vicenç (1999-12-01)
      Research report
      Open Access
      Some authors have hypothesized that the observed self-synchronized activity in ant colonies provides some adaptive advantages, and, in particular, it has been suggested that task realization may benefit from this ordered ...
    • Social insects and swarm intelligence 

      Delgado Pin, Jordi (1999-11)
      Research report
      Open Access
      Most of the questions on the dynamics of systems of strongly interacting (simple) agents we can pose could be reframed, without any modification, in the context of social insects, since these are, without any doubt, a ...
    • Stopping criteria in contrastive divergence: Alternatives to the reconstruction error 

      Buchaca Prats, David; Romero Merino, Enrique; Mazzanti Castrillejo, Fernando Pablo; Delgado Pin, Jordi (2014)
      Conference report
      Open Access
      Restricted Boltzmann Machines (RBMs) are general unsupervised learning devices to ascertain generative models of data distributions. RBMs are often trained using the Contrastive Divergence learning algorithm (CD), an ...
    • Universal computation in fluid neural networks 

      Vicente Solé, Ricardo; Delgado Pin, Jordi (1995-10)
      Research report
      Open Access
      Fluid Neural Networks can be used as a theoretical framework for a wide range of complex systems such as social insects. In this paper we show that collective logical gates can be built in such a way that complex computation ...
    • Weighted contrastive divergence 

      Romero Merino, Enrique; Mazzanti Castrillejo, Fernando Pablo; Delgado Pin, Jordi; Buchaca Prats, David (2019-06)
      Article
      Open Access
      Learning algorithms for energy based Boltzmann architectures that rely on gradient descent are in general computationally prohibitive, typically due to the exponential number of terms involved in computing the partition ...