A correction on Shiloach's algorithm for minimum linear arrangement of trees

More than 30 years ago, Shiloach published an algorithm to solve the minimum linear arrangement problem for undirected trees. Here we fix a small error in the original version of the algorithm and discuss its effect on subsequent literature. We also improve some aspects of the notation.Comment: A new introductory paragraph has been added; error solutions and notation improvements are discussed with more dept

Engineering a QoS Provider Mechanism for Edge Computing with Deep Reinforcement Learning

With the development of new system solutions that integrate traditional cloud computing with the edge/fog computing paradigm, dynamic optimization of service execution has become a challenge due to the edge computing resources being more distributed and dynamic. How to optimize the execution to provide Quality of Service (QoS) in edge computing depends on both the system architecture and the resource allocation algorithms in place. We design and develop a QoS provider mechanism, as an integral component of a fog-to-cloud system, to work in dynamic scenarios by using deep reinforcement learning. We choose reinforcement learning since it is particularly well suited for solving problems in dynamic and adaptive environments where the decision process needs to be frequently updated. We specifically use a Deep Q-learning algorithm that optimizes QoS by identifying and blocking devices that potentially cause service disruption due to dynamicity. We compare the reinforcement learning based solution with state-of-the-art heuristics that use telemetry data, and analyze pros and cons

Technical Note TN 2.2 Fuel load sampling of a Cupressus sempervirens hedge

In this document, data from a destructive sampling of a Cupressus sempervirens hedgerow are shown, as well as the followed methodology. Measures of sizes and weights have been taken. With these data, moisture content, fuel load and bulk density have been calculated. Different fuel classes (state and diameter) have been taken into account.Postprint (updated version

A free-energy stable nodal discontinuous Galerkin approximation with summation-by-parts property for the Cahn-Hilliard equation

We present a nodal Discontinuous Galerkin (DG) scheme for the Cahn-Hilliard equation that satisfies the summation-by-parts simultaneous-approximation-term (SBP-SAT) property. The latter permits us to show that the discrete free-energy is bounded, and as a result, the scheme is provably stable. The scheme and the stability proof are presented for general curvilinear three-dimensional hexahedral meshes. We use the Bassi-Rebay 1 (BR1) scheme to compute interface fluxes, and an IMplicit-EXplicit (IMEX) scheme to integrate in time. Lastly, we test the theoretical findings numerically and present examples for two and three-dimensional problems

SERS study of different species of p-aminothiophenol adsorbed on silver nanoparticles

In the present work we have focused the discussion on the experimental and theoretical SERS spectra of the organic compound pATP recorded on silver colloids. The huge SERS of pATP on metal substrates is significantly different from its ordinary Raman spectra due to the formation of a new specie namely p,p’ –dimercaptoazobenzene (DMAB). The features of the SERS spectra of pATP are strongly dependent on many factors as i.e. the laser power density or the laser wavelength but there are still important aspects to understand as, for example, the effect of the concentration that has already been studied before by our group. In this case we have analyzed the effect of the concentration at different wavelengths on the SERS spectra of pATP on silver nanoparticles.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Patria, estado y legitimidad religiosa en la teoría política de Cicerón

Este trabajo analiza los conceptos de patria, nación y estado en los escritos de Cicerón, su infl uencia posterior, y la importancia de la religión y el ejercicio de los cargos sacerdotales en las decisiones institucionales. Entre algunos politólogos, la república romana –y en general las comunidades políticas de la antigüedad− no debe ser considerada un estado porque carece de las características que ellos solo reconocen a partir de la edad moderna, pero las palabras de Cicerón y la propia organización constitucional de la res publica romana confi rman que los ciudadanos romanos se organizaron en una comunidad que presenta los mismos rasgos que aquellas otras que, desde Maquiavelo, llamamos estados.Th is paper analyses the concepts of homeland, nation and state in the writings of Cicero, their subsequent infl uence, and the importance of religion and the exercise of priestly offi ces in the making of institutional decisions. Among some political scientists, the Roman republic, and in general political communities of antiquity, should not be considered a state because it lacks the distinctive features that the only recognise from the modern age onwards. But the words of Cicero and the constitutional organization of the Roman res publica, confi rm that the Roman citizens organised themselves in a community with the same features as those which, since Machiavelli, we call states

El mercado en la antigua Roma y la economía agropecuaria en tiempos de crisis

This paper presents an overview of the market concept and investigates the features that characterize the economy of the Roman Empire. The agricultural production leadership and importance in the Late Antiquity is asserted, unveiling the scarce mercantile spirit among the wealthy landowners.Este trabajo presenta una síntesis del concepto de mercado e indaga en los rasgos que caracterizan la economía del Imperio romano. En él se afirma la consistencia y protagonismo de la producción agrícola en los siglos de la antigüedad tardía y se evidencia el escaso espíritu mercantil de los ricos propietarios de tierras