Winnerless competition in coupled Lotka-Volterra maps

Winnerless competition is analyzed in coupled maps with discrete temporal evolution of the Lotka-Volterra type of arbitrary dimension. Necessary and sufficient conditions for the appearance of structurally stable heteroclinic cycles as a function of the model parameters are deduced. It is shown that under such conditions winnerless competition dynamics is fully exhibited. Based on these conditions different cases characterizing low, intermediate, and high dimensions are therefore computationally recreated. An analytical expression for the residence times valid in the N-dimensional case is deduced and successfully compared with the simulations.J.L.C. and E.D.G. acknowledge support from IVIC-141, L.A.G.-D. acknowledges support from IVIC-1089 and P.V. acknowledges support from MINECO TIN2012-30883

“Environments”: Live audiovisual performance

The evolution of concerts throughout the years has enticed the inclusion of technological elements to enhance the musicians’ performance onstage and the audience’s experience. This inclusion has evolved into practical results achieved by using modern tools that bring about numerous possibilities. The addition of visuals in live shows has been a logical path in this audiovisual generation and it’s becoming even more recurrent in preset-day acts. The main focus of this project is to create an audiovisual performance that generates visuals reactant to the music being played in real time. This approach opposes a typical modus operandi of prerecorded videos, which are sequenced to play at specific points throughout a more conventional (but not limited) concert setting. The music is broken down and arranged into sequences that are triggered to recreate and remix original electronic music tracks while visuals are generated and manipulated by audio and MIDI. Through improvisation, spectators are able to appreciate the relation of the music with the imagery.https://remix.berklee.edu/graduate-studies-production-technology/1087/thumbnail.jp

Amantes que se desvanecen en el tiempo: la memoria etnográfica o la compleja significación de las leyendas

Los mitos y leyendas no están tan lejos como a veces se ha creído del rumor o del cuento, pues con ellos comparten -a menudo- los mismos asuntos. Pero, a diferencia de ellos -que son cosa del instante o claramente intemporales-, mito y leyenda constituyen una parte poco conocida y, sin embargo, muy importante de la memoria colectiva. Sus relatos aluden a la vez al pasado y presente de los pueblos, contribuyendo a configurar un tiempo y una memoria continuos que -por haber sido estudiados especialmente desde la antropologíapodríamos denominar “etnográficos”. A través del análisis de la compleja formación de algunas leyendas, este trabajo propone que hay algún tipo de “verdad” en lo legendario: que nos dice algo importante sobre la visión que unas gentes tienen de sí mismas y de los otros a lo largo del tiempo.Myths and legends are not so distant from rumour or tales as has often been believed, for they share -frequently- the same topics. But, in contrast to the later -which are momentary or clearly not temporary- myth and legend furthermore constitute a little known and yet very important part of collective memory. Their accounts allude to both the past and the present of peoples, contributing to the shaping of a continuous time and memory which -by having been studied especially from an anthropological perspective- we could designate as “ethnographical”. Through the analysis of the complex formation of some legends, this paper suggests that there exists some sort of “truth” in the legendary: that tell us something important about the view held by some peoples of themselves and of others

Influence of loudspeaker directivity on the measurement uncertainty

One of the most significant aspects of a building’s acoustic behavior is the airborne sound insulation of the room façades, since this determines the protection of its inhabitants against environmental noise. For this reason, authorities in most countries have established in their acoustic regulations for buildings the minimum value of sound insulation that must be respected for façades. In order to verify compliance with legal requirements it is usual to perform acoustic measurements in the finished buildings and then compare the measurement results with the established limits. Since there is always a certain measurement uncertainty, this uncertainty must be calculated and taken into account in order to ensure compliance with specifications. The most commonly used method for measuring sound insulation on façades is the so-called Global Loudspeaker Method, specified in ISO 140-5:1998. This method uses a loudspeaker placed outside the building as a sound source. The loudspeaker directivity has a significant influence on the measurement results, and these results may change noticeably by choosing different loudspeakers, even though they all fulfill the directivity requirements of ISO 140-5. This work analyzes the influence of the loudspeaker directivity on the results of façade sound insulation measurement, and determines its contribution to measurement uncertainty. The theoretical analysis is experimentally validated by means of an intermediate precision test according to ISO 5725-3:1994, which compares the values of sound insulation obtained for a façade using various loudspeakers with different directivitie

Modelling of chemical control of "Conyza" and the risk of glyphosate resistance

Se ha desarrollado un modelo de genética de poblaciones para estudiar el efecto de diferentes estrategias de manejo químicas en el control de poblaciones de Conyza y el desarrollo de resistencia a glifosato en poblaciones inicialmente susceptibles. Las estrategias de manejo se basaron en la aplicación de dos herbicidas en diferentes fechas, aislados o en mezcla, donde uno de ellos era glifosato. Las simulaciones mostraron que la aplicación de glifosato con herbicidas postemergentes controlaron más eficazmente las poblaciones de “Conyza” que las aplicaciones de glifosato con herbicidas preemergentes. Las aplicaciones tardías (principalmente en marzo) del herbicida postemergente consiguieron los mejores controles de las poblaciones y un riesgo bajo de desarrollar resistencia en poblaciones de Conyza inicialmente susceptibles.We developed a model of population genetics to study the effect of different chemical management strategies on the control of “Conyza” populations and the resistance evolution to glyphosate in initially susceptible populations. The management strategies were based on herbicides; glyphosate and another post- or pre-emergent herbicide applied alone or in mixtures at different timing. The simulations showed that glyphosate and post-emergent herbicides controlled better “Conyza” populations than glyphosate and pre-emergent herbicides. Later post-emergent herbicide applications (in March principally) reached the best control of “Conyza” populations and a low resistance risk in initially susceptible populations

Business model analysis of public services operating in the smart city ecosystem: The case of SmartSantander

As the deployment of Internet of Things and other enabling technologies is still in an initial phase worldwide, few research studies have addressed the associated business models. This paper aims to fill this gap. The main objective of this research is to gain a deeper knowledge about practical business models matching into a real-life smart city ecosystem. Hence, a benchmarking of eight urban services provided in the city of Santander has been carried out: waste management; water supply; traffic management; street lighting; augmented reality and tourism; incidences management, parks and gardens and citizen participation. Among the main results of our study, we highlight that those public services properly managed embedding IoT technology convey cost reductions in the long term. There is also a reduction in energy consumption and environmental impact with the consequent social impact. It should also be highlighted that most data are managed with the same platform. Last but not least, an emerging ecosystem of incentivized citizens has been proved to be arising

Hypercube algorithms on mesh connected multicomputers

A new methodology named CALMANT (CC-cube Algorithms on Meshes and Tori) for mapping a type of algorithm that we call CC-cube algorithm onto multicomputers with hypercube, mesh, or torus interconnection topology is proposed. This methodology is suitable when the initial problem can be expressed as a set of processes that communicate through a hypercube topology (a CC-cube algorithm). There are many important algorithms that fit into the CC-cube type. CALMANT is based on three different techniques: (a) the standard embedding to assign the processes of the algorithm to the nodes of the mesh multicomputer; (b) the communication pipelining technique to increase the level of communication parallelism inherent in the CC-cube algorithms; and (c) optimal message-scheduling algorithms proposed in this work in order to avoid conflicts and minimizing in this way the communication time. Although CALMANT is proposed for multicomputers with different interconnection network topologies, the paper only focuses on the particular case of meshes.Peer ReviewedPostprint (published version

A study of the communication cost of the FFT on torus multicomputers

The computation of a one-dimensional FFT on a c-dimensional torus multicomputer is analyzed. Different approaches are proposed which differ in the way they use the interconnection network. The first approach is based on the multidimensional index mapping technique for the FFT computation. The second approach starts from a hypercube algorithm and then embeds the hypercube onto the torus. The third approach reduces the communication cost of the hypercube algorithm by pipelining the communication operations. A novel methodology to pipeline the communication operations on a torus is proposed. Analytical models are presented to compare the different approaches. This comparison study shows that the best approach depends on the number of dimensions of the torus and the communication start-up and transfer times. The analytical models allow us to select the most efficient approach for the available machine.Peer ReviewedPostprint (published version

Evaluating the institutionalisation of diversity outreach in top universities worldwide

The participation of diverse demographics in higher education has risen over the last halfcentury; meanwhile, different political and social tiers have been assigning a more active role to institutions in terms of equality and social justice. This change in circumstances has led to the roll out of processes to institutionalise diversity outreach. This study was conducted for the clear purpose of assessing the current institutionalisation status of diversity outreach in 127 key universities from the Academic Ranking of World Universities based on the opinions of diversity outreach managers and the information published on institutional websites, in turn measuring compliance with various indicators. A qualitative analysis of the institutional statements, the goals sought through strategic plans and the definitions of diversity itself was also conducted. The evidence reveals the early stage of the institutionalisation process in universities on account of the low percentage obtained for the proposed indicators. Furthermore, the study failed to exhibit significant differences in this process in terms of the institutional ownership or position held in the ranking; however, more prominent progress was noted in the North-American region when geographical differences were taken into account, likely as a result of the historical background in the advocacy for equal opportunities. Lastly, a change of approach to the conceptualisation of diversity is suggested in favour of equality and social justice.This study was supported by the Spain’s Ministry of Science, Innovation and Universities, State Plan for R&D (Grant number EDU2017-82862-R)

Los Modelos Docentes en la Matemáticas Preuniversitarias y su Relación con los Diferentes Grupos de Edad de los Docentes en Formación

This paper addresses the mathematical education received during the pre-university stage based on the teaching-learning processes experienced by 225 students from the master’s degree in Teacher Training of Secondary, Baccalaureate, and FP and the Degree of Teacher of Primary Education of the Madrid Open University (UDIMA). For collecting the required information, a computerized questionnaire designed by the authors of this work and validated by the Ethics Committee of the Madrid Open University (UDIMA), has been used. The results of our study reveal the preservice teachers' memories about mathematics during the Primary and Secondary stages. Traditional teaching models, based on the repetition of calculation procedures, are the majority compared to other active teaching models. It is observed that a progressive increase in the methodologies supported by solving complex problems, detecting a moderate influence of the legislative changes produced in Spain in 2006. The mastery of classical teaching models and the moderate work around complex problems detected in pre-university education can be major constraints when developing new competency-based legislative approaches.En este trabajo se aborda la formación matemática recibida en la etapa de formación preuniversitaria a través del recuerdo de los procesos de enseñanza-aprendizaje vividos, de 225 estudiantes procedentes del Máster de Formación del Profesorado de Secundaria, Bachillerato y FP y del Grado de Maestro de Educación Primaria de la Universidad XXXX. Para la recogida de información se ha empleado un cuestionario informatizado diseñado por los autores del trabajo y que ha sido validado por el Comité de Ëtica de la XXXX. Mediante estadística descriptiva y el análisis de correlaciones entre las diferentes variables se ha dado respuesta a cuatro hipótesis de investigación. Los resultados del estudio revelan unos recuerdos escolares en relación a la materia de matemáticas de la etapa de Primaria y Secundaria donde los modelos docentes tradicionales, basados en la repetición de procedimientos de cálculo, son mayoritarios frente a otros modelos docentes de corte activo. Adicionalmente se observa un aumento progresivo de la importancia de resolución de problemas complejos detectándose una influencia moderada de los cambios legislativos producidos en España en el año 2006. El dominio de los modelos docentes clásicos y el moderado trabajo en torno a problemas complejos detectados en la formación recibida puede suponer una restricción importante a la hora de desarrollar los nuevos enfoques legislativos basados en competencias