Cultural Interactivity in the Digital Age

The essay addresses mediated communication in a context of technological convergence that has reorganized the logic of production and transmission of symbolic content worldwide To do this it focuses on the cultural dimension of participation that audiences have today particularly on their ability to interact and the implications this has for the media industry and our society This is particularly sensitive in the midst of a global pandemic where long-term personal relationships that are important to our well-being are lost or modified It describes some conceptual approaches that deserve some attention due to their relevance to the debate and their daily manifestation in social life Finally it warns of certain risks particularly associated with some principles that may be threatened in this process of rearranging the media ecosyste

Constraints to Dark Matter from Inert Higgs Doublet Model

We study the Inert Higgs Doublet Model and its inert scalar Higgs $H$ as the only source for dark matter. It is found that three mass regions of the inert scalar Higgs can give the correct dark matter relic density. The low mass region (between 3 and 50 GeV) is ruled out. New direct dark matter detection experiments will probe the intermediate (between 60 and 100 GeV) and high (heavier than 550 GeV) mass regions. Collider experiments are advised to search for $D^\pm \to HW^\pm$ decay in the two jets plus missing energy channel

The matching relaxation for a class of generalized set partitioning problems

This paper introduces a discrete relaxation for the class of combinatorial optimization problems which can be described by a set partitioning formulation under packing constraints. We present two combinatorial relaxations based on computing maximum weighted matchings in suitable graphs. Besides providing dual bounds, the relaxations are also used on a variable reduction technique and a matheuristic. We show how that general method can be tailored to sample applications, and also perform a successful computational evaluation with benchmark instances of a problem in maritime logistics.Comment: 33 pages. A preliminary (4-page) version of this paper was presented at CTW 2016 (Cologne-Twente Workshop on Graphs and Combinatorial Optimization), with proceedings on Electronic Notes in Discrete Mathematic

Evaporación mecánica de salmueras de litio

Tesis (Ingeniero Civil en Minas)En el presente trabajo se realizó una comparación entre el proceso actual de concentración de salmueras de litio y el proceso planteado en el presente documento, como contribución del trabajo se destaca la originalidad del punto de vista tratado, la creación de un modelo de simulación aplicable a la industria actual, la creación de diferentes líneas de estudios para posibles trabajos de investigación en la universidad Andrés Bello. Desde el punto de vista de la industria el presente trabajo instala la posibilidad de cambiar un proceso y hacer más eficiente la industria chilena del litio. El estudio plantea de alguna manera la posibilidad de crear una industria extractiva de litio con menores impactos medioambientales en relación a la calidad de sales obtenidas en el proceso y a la recuperación de agua a través de los equipos en cuestión

Delayed improvement local search

Local search is a fundamental tool in the development of heuristic algorithms. A neighborhood operator takes a current solution and returns a set of similar solutions, denoted as neighbors. In best improvement local search, the best of the neighboring solutions replaces the current solution in each iteration. On the other hand, in first improvement local search, the neighborhood is only explored until any improving solution is found, which then replaces the current solution. In this work we propose a new strategy for local search that attempts to avoid low-quality local optima by selecting in each iteration the improving neighbor that has the fewest possible attributes in common with local optima. To this end, it uses inequalities previously used as optimality cuts in the context of integer linear programming. The novel method, referred to as delayed improvement local search, is implemented and evaluated using the travelling salesman problem with the 2-opt neighborhood and the max-cut problem with the 1-flip neighborhood as test cases. Computational results show that the new strategy, while slower, obtains better local optima compared to the traditional local search strategies. The comparison is favourable to the new strategy in experiments with fixed computation time or with a fixed target.publishedVersio

De Nanteuil, Matthieu. 2013. La democracia insensible. Economía y política a prueba del cuerpo. Bogotá: Ediciones Uniandes [224 pp.].

La crítica al liberalismo ha sido uno de los espacios más fértiles de producción académica en los últimos años en Europa. Desde distintas perspectivas y disciplinas, la gubernamentalidad liberal ha sido puesta en tela de juicio, en momentos cuando crisis económicas y de representatividad política han dejado claro cuáles son los límites del orden europeo post-Guerra Fría. De forma paralela, estas visiones —la mayoría de las veces— no han logrado salir del mundo de las aulas universitarias, gen..