Modelling and simulation of several interacting cellular automata

Cellular Automata are used for modelling and simulation of many systems. In some applications, the system is formed by a set of subsystems that can be modelled separately, but, in such cases, the existence of interactions between these subsystems requires additional modelling and computer programming. In this paper we propose a modelling methodology for the simulation of a set of Cellular Automata models that interact with each other. The modelling methodology is described, together with an insight on implementation details. Also, it is applied to a particular Cellular Automata model, the Sanpile Model, to illustrate its use and to obtain some example simulations

Interactive Terrain Simulation and Force Distribution Models in Sand Piles

This paper presents an application of Cellular Automata in the field of dry Granular Systems modelling. While the study of granular systems is not a recent field, no efficient models exist, from a computational point of view, in classical methodologies. Some previous works showed that the use of Cellular Automata is suitable for the development of models that can be used in real time applications. This paper extends the existing Cellular Automata models in order to make them interactive. A model for the reaction to external forces and a pressure distribution model are presented and analyzed, with numerical examples and simulations

Claves geográficas para la interpretación del patrimonio hidráulico mediterráneo. A propósito de los regadíos históricos valencianos

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Texture advection on discontinuous flows

Texture advection techniques, which transport textures using a velocity field, are used to visualize the dynamics of a flow on a triangle mesh. Some flow phenomena lead to velocity fields with discontinuities that cause the deformation of the texture which is not properly controlled by these techniques. We propose a method to detect and visualize discontinuities on a flow, keeping consistent texture advection at both sides of the discontinuity. The method handles the possibility that the discontinuity travels across the domain of the flow with arbitrary velocity, estimating its speed with least-squares approximation. The technique is tested with different sample scenarios and with two avalanche scenes, showing that it can run at interactive rates

Geography and hydraulic mediterranean heritage: With regards to historic valencian irrigation

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Environmental and social impact assessment of optimized post-tensioned concrete road bridges

[EN] Most of the definitions of sustainability include three basic pillars: economic, environmental, and social. The economic pillar has always been evaluated but not necessarily in the sense of economic sustainability. On the other hand, the environmental pillar is increasingly being considered, while the social pillar is weakly developed. Focusing on the environmental and social pillars, the use of methodologies to allow a wide assessment of these pillars and the integration of the assessment in a few understandable indicators is crucial. This article is structured into two parts. In the first part, a review of life cycle impact assessment methods, which allow a comprehensive assessment of the environmental and social pillars, is carried out. In the second part, a complete environmental and social sustainability assessment is made using the ecoinvent database and ReCiPe method, for the environmental pillar, and SOCA database and simple Social Impact Weighting method, for the social pillar. This methodology was used to compare three optimized bridges: two box-section post-tensioned concrete road bridges with a variety of initial and maintenance characteristics, and a pre-stressed concrete precast bridge. The results show that there is a high interrelation between the environmental and social impact for each life cycle stage.This research was funded by the Ministerio de Economia, Ciencia y Competitividad and FEDER funding grant number [BIA2017-85098-R]Penades-Pla, V.; Martínez-Muñoz, D.; García-Segura, T.; Navarro, IJ.; Yepes, V. (2020). Environmental and social impact assessment of optimized post-tensioned concrete road bridges. Sustainability. 12(10):4265-01-4265-18. https://doi.org/10.3390/su12104265S4265-014265-18121

New Developments in Simulation-Based Harbour Crane Training

This paper presents the efforts that have been made during the development of a set of harbour training simulators to improve their quality. The paper focuses on two main research lines: the improvement of complex physical systems involved in the simulation and the analysis of hardware architecture solutions. Cable-based hoist systems and bulk materials are systems present in different harbour equipment and are usually simulated with poor quality due to their complexity. In this paper physics-based models for the interactive simulation of these systems are proposed and applied to real cases. Also, different hardware simulator architectures are analysed and different approaches are proposed to the problem of choosing the devices for a simulator

GESTIÓN DE RECURSOS EN REDES 3G: USO DE PROGRAMACIÓN EVOLUTIVA PARA LA EVALUACIÓN COMPARARADA DE POLÍTICAS

RESUMENEn este trabajo se evalúan diferentes políticas de control de admisión de llamadas en varios escenarios celulares multiservicio sin buffers. Para cada una de las políticas estudiadas se obtiene la máxima tasa de llamadas que puede ser ofrecida al sistema para lograr una QoS objetivo dada, definida en términos de probabilidades de pérdidas. Para la mayoría de políticas usamos un algoritmo genético para encontrar una buena configuración. Concluimos que las prestaciones de las políticas de la clase trunk reservation son mejores a aquellas que producen una solución con forma producto y que esta mejora oscila entre el 5% y el 15%.PALABRAS CLAVESRedes celulares multiservicio.Algoritmos genéticos.Políticas de control de admisión.Evaluación comparativa.Dimensionado

Butterfly biodiversity in the city is driven by the interaction of the urban landscape and species traits : a call for contextualised management

Altres ajuts: Acord transformatiu CRUE-CSICContext: Urbanisation is an environmental filter for many species that leads to community homogenisation, with a few species inhabiting isolated patches (e.g. public and private gardens and parks) embedded within the urban landscape. Promoting biodiversity in urban areas requires understanding which species traits allow species to survive the urban landscape. Objectives: The objective of this study was to assess how species traits and landscape factors combine to allow species functional groups to live in the city. Methods: We used butterfly count data collected by volunteers in 24 gardens of Barcelona city, during 2018 and 2019. Species were clustered in functional groups according to their traits. We applied a multinomial choice model to test for the effect of the landscape on the different functional groups. Results: Three functional groups became prevalent in the city while a fourth, containing most sedentary specialist species, was filtered out. Although the observed groups had similar species richness, abundances varied depending on urban landscape characteristics. Specialist sedentary specialists and medium mobile species were all favoured by patch connectivity; while the presence of mobile generalist species was only enhanced by habitat quality. Our results indicate that butterfly communities are more diverse in highly connected gardens. Conclusions: Our study highlights the need of contextualised management with actions accounting for the species functional groups, rather than a management focused on general species richness. It demonstrates that urban landscape planning must focus on improving connectivity inside the city in order to diversify the community composition