Browsing by Author "Delgado Pin, Jordi"
Now showing items 1-18 of 18
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A Computational characterization of collective chaos
(1998-06)
Research report
Open AccessWe 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 ... -
A list of applications of stallings automata
(2022-11-22)
Article
Open AccessThis survey is intended to be a fast (and reasonably updated) reference for the theory of Stallings automata and its applications to the study of subgroups of the free group, with the main accent on algorithmic aspects. ... -
Aprenentatge de la Programació al Citilab: Squeak i Scratch
(2008)
Conference report
Open AccessAquest 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
(2001-07)
Research report
Open AccessThe 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
(1995-03)
Research report
Open AccessSubmitted 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
(Universitat Politècnica de Catalunya, 2002)
Article
Open AccessEn 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
(1997-06)
Research report
Open AccessFluid 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
(Fundación para el Fomento de la Ingeniería del Agua, 2002-12)
Article
Open AccessEl 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
(2018-07)
Article
Open AccessRestricted 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
(Universitat Politècnica de Catalunya, 1997-12-05)
Doctoral thesis
Open Access -
Pattern formation and optimization in army ant raids
(1999-12)
Research report
Open AccessArmy 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
(1995-10)
Research report
Open AccessThe 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
(1999-12-01)
Research report
Open AccessSome 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
(1999-11)
Research report
Open AccessMost 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 ... -
Stallings automata for free-times-abelian groups: intersections and index
(2022-06-22)
Article
Open AccessWe extend the classical Stallings theory (describing subgroups of free groups as automata) to direct products of free and abelian groups: after introducing enriched automata (i.e., automata with extra abelian labels), we ... -
Stopping criteria in contrastive divergence: Alternatives to the reconstruction error
(2014)
Conference report
Open AccessRestricted 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
(1995-10)
Research report
Open AccessFluid 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
(2019-06)
Article
Open AccessLearning 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 ...
