Ganchúa

Universidad de Sevilla. Máster en Guión, Narrativa y Creatividad Audiovisua

High Performance Algorithms and Implementations Using Sparse and Parallelization Techniques on MBS

In this paper we will see how the efficiency of the MBS simulations can be improved in two different ways, by considering both an explicit and implicit semi-recursive formulation. The explicit method is based on a double velocity transformation that involves the solution of a redundant but compatible system of equations. The high computational cost of this operation has been drastically reduced by taking into account the sparsity pattern of the system. Regarding this, the goal of this method is the introduction of MA48, a high performance mathematical library provided by Harwell Subroutine Library. The second method proposed in this paper has the particularity that, depending on the case, between 70 and 85% of the computation time is devoted to the evaluation of forces derivatives with respect to the relative position and velocity vectors. Keeping in mind that evaluating these derivatives can be decomposed into concurrent tasks, the main goal of this paper lies on a successful and straightforward parallel implementation that have led to a substantial improvement with a speedup of 3.2 by keeping all the cores busy in a quad-core processor and distributing the workload between them, achieving on this way a huge time reduction by doing an ideal CPU usag

Elementos metodológicos para evaluar la sostenibilidad turística en el caribe colombiano

This paper reflects on how to evaluate the sustainability of tourist activities developed in coastal territories of the Colombian Caribbean, doing it through a descriptive methodological scope and a qualitative approach. In this way, the authors combine their expertise on the topic and the analysis of specialized scientific literature, to elaborate a state of the art of the topic and to describe in detail the steps that must be followed in a process of this type. The developed state of the art is organized into four thematic lines related to the characterization of beaches, sustainability of tourist activities, evaluation of the impacts generated in/by them and the existing methodologies for their estimation or measurement. Likewise, the methodological elements proposed for the measurement of sustainability are grouped into two phases: the first, related to adaptation, and the second, concerning the implementation of the system of indicators required to assess sustainability. Finally, the conclusions emphasize at the usefulness and relevance of this work as a preliminary initiative that will contribute to the development of empirical research on the topic and the strengthening of tourism planning processes from the local perspective.En este trabajo se reflexiona acerca de cómo evaluar la sostenibilidad de las actividades turísticas desarrolladas en territorios costeros del Caribe colombiano, a través de un alcance metodológico descriptivo y un enfoque cualitativo. De esta forma, los autores combinan su experticia en el tema y el análisis de literatura científica especializada, para elaborar un estado del arte de la temática y describir detalladamente los pasos que se deben seguir en un proceso de este tipo. El estado del arte desarrollado se organiza en cuatro líneas temáticas relacionadas con la caracterización de playas, sostenibilidad de las actividades turísticas, evaluación de los impactos generados en/por estas y las metodologías existentes para su estimación o medición. Asimismo, los elementos metodológicos propuestos para la medición de la sostenibilidad se agrupan en dos fases: la primera, relacionada con la adaptación, y la segunda, concerniente a la implementación del sistema de indicadores requerido para evaluar la sostenibilidad. Por último, las conclusiones enfatizan en la utilidad y pertinencia de este trabajo como iniciativa preliminar que contribuirá al desarrollo de investigaciones empíricas en la materia y al fortalecimiento de los procesos de planificación turística desde la perspectiva local

Ciencia en el Barroco español: nuevas fuentes documentales de Jerónimo de Ayanz

Recently, a printed document of Jerónimo de Ayanz, acquired by the Biblioteca Nacional de España (the National Library of Spain), has revealed that this inventor was active until the very last days of his life and shows his interest in technology, research and science. The document, addressed to the Prince Emmanuel Philibert of Savoy, is one chapter of a book, of which no copies are known, that Ayanz had prepared in 1612 and that he probably wanted to publish with the support of the Prince. In this paper we present and comment this important text, where the author discusses central scientific subjects of his time such as the compulsory movement of the elements, the existence of vacuum, the possibility of perpetual motion, the sphere of fire and falling bodies.En la vida de Jerónimo de Ayanz hay un lapso de tiempo, desde noviembre de 1611 hasta su muerte, en marzo de 1613, del que no disponíamos de ninguna fuente documental. Recientemente, un impreso adquirido por la Biblioteca Nacional de España, y que hemos fechado en 1612, revela que el técnico estuvo activo hasta sus últimos días y nos muestra una nueva faceta suya: la experimentación científica. Este documento incluye una carta impresa dirigida al príncipe Emanuel Filiberto de Saboya. En la misiva, Ayanz presenta al príncipe un capítulo de un libro científico desconocido que estaba escribiendo en el que, a través de la experimentación, trata asuntos como la compulsión de los elementos, la existencia del vacío, el movimiento perpetuo, la esfera ígnea o la caída de los cuerpos. Nuestro objetivo es presentar este valioso documento y exponer los experimentos e innovadoras teorías científicas que Ayanz plantea

Improving Message Delivery Performance in Opportunistic Networks using a Forced-stop diffusion scheme

The final publication is available at Springer via http://dx.doi.org/10.1007/978-3-319-40509-4_11The performance of mobile opportunistic networks strongly depends on contact duration. If the contact lasts less than the required transmission times, some messages will not get delivered, and the whole diffusion scheme will be seriously affected. In this paper we propose a new diffusion method, called Forced-Stop, that is based on controlling node mobility to guarantee a complete message transfer. Using the ONE simulator and realistic mobility traces, we compared our proposal with the classical Epidemic diffusion. We show that Forced-Stop improves the message delivery performance, increasing the delivery ratio up to 30\%, and reducing the latency of message delivery up to 40\%, with a limited impact on buffer utilisation and message relaying. These results can be a relevant indication to the designers of opportunistic network applications that could integrate in their products strategies to inform the user about the need to temporarily stop in order to favor the overall data delivery.This work was partially supported by the Ministerio de Economía y Competitividad, Programa Estatal de Investigación, Desarrollo e Innovación Orientada a los Retos de la Sociedad, Proyectos I+D+I 2014, Spain, under Grant TEC2014-52690-R, the Generalitat Valenciana, Spain, under Grant AICO/2015/108, the Secretaría Nacional de Educación Superior, Ciencia, Tecnología e Innovación del Ecuador(SENESCYT), and the Universidad Laica Eloy Alfaro de Manabi, Ecuador.Herrera Tapia, J.; Hernández Orallo, E.; Tomás Domínguez, AE.; Manzoni, P.; Tavares De Araujo Cesariny Calafate, CM.; Cano Escribá, JC. (2016). Improving Message Delivery Performance in Opportunistic Networks using a Forced-stop diffusion scheme. En Ad-hoc, Mobile, and Wireless Networks. Springer. 156-168. https://doi.org/10.1007/978-3-319-40509-4_11S156168Pelusi, L., Passarella, A., Conti, M.: Opportunistic networking: data forwarding in disconnected mobile ad hoc networks. IEEE Commun. Mag. 44(11), 134–141 (2006)Ferretti, S.: Shaping opportunistic networks. Comput. Commun. 36, 481–503 (2013)Keränen, A., Ott, J., Kärkkäinen, T.: The ONE simulator for DTN protocol evaluation. In: Proceedings of the Second International ICST Conference on Simulation Tools and Techniques, Rome (2009)Tsai, T.-C., Chan, H.-H.: NCCU Trace: social-network-aware mobility trace. IEEE Commun. Mag. 53, 144–149 (2015)AnAverage WhatsApp User Sends Messages per Month, 15 September 2015. http://www.statista.com/chart/1938/monthly-whatsapp-usage-per-userNiu, J., Guo, J., Cai, Q., Sadeh, N., Guo, S.: predict and spread: an efficient routing algorithm for opportunistic networking. In: Wireless Communications and Networking Conference (WCNC), 2011 IEEE, pp. 498–503, Cancún (2011)Thakur, G.S., Kumar, U., Helmy, A., Hsu, W.-J.: On the efficacy of mobility modeling for DTN evaluation: analysis of encounter statistics andspatio-temporal preferences. In: 7th International Wireless Communications and Mobile Computing Conference (IWCMC), pp. 510–515, Istanbul (2011)Warthman, F.: Delay-and Disruption-Tolerant Networks (DTNs) a tutorial, version 2.0. In: The InterPlaNetary (IPN) Internet Project. InterPlanetary Networking Special Interest Group (IPNSIG) (2012)Battestini, A., Setlur, V., Sohn, T.: A large scale study of text messaging use. In: 12th International Conference on Human Computer Interaction with Mobile Devices and Services MobileHCI, pp. 1–10, Lisbon (2010)Förster, A., Garg, K., Nguyen, H.A., Giordano, S. On context awareness and social distance in human mobility traces. In: Third ACM International Workshop on Mobile Opportunistic Networks, pp. 5–12, Zürich (2012)Boldrini, C., Conti, M., Passarella, A.: Modelling data dissemination in opportunistic networks. In: Proceedings of the Third ACM Workshop on Challenged Networks - CHANTS 2008, pp. 89–96, San Francisco (2008)Natalizio, E., Loscrí, V.: Controlled mobility in mobile sensor networks: advantages, issues and challenges. Telecommun. Syst. 52(4), 2411–2418 (2013)Neena, V.V., Rajam, V.M.A.: Performance analysis of epidemic routing protocol for opportunistic networks in different mobility patterns. In: 2013 International Conference on Computer Communication and Informatics, pp. 1–5, Coimbatore (2013)Mehta, N., Shah, M.: Performance evaluation of efficient routing protocols in delay tolerant network under different human mobility models. Int. J. Grid Distrib. Comput. 8(1), 169–178 (2015)Su, J., Chin, A., Popivanova, A., Goel, A., Lara, E.D.: User mobility for opportunistic ad-hoc networking. In: Sixth IEEE Workshop on Mobile Computing Systems and Applications (WMCSA 2004), Low Wood (2004)Feng, Z., Chin, K.-W.: A unified study of epidemic routing protocols and their enhancements. In: IEEE 26th International Parallel and Distributed Processing Symposium Workshops PhD Forum (IPDPSW), pp. 1484–1493, Shanghai (2012)Vardalis, D., Tsaoussidis, V.: Exploiting the potential of DTN for energy-efficient internetworking. J. Syst. Softw. 90, 91–103 (2014)Rango, F.D., Amelio, S., Fazio, P.: Epidemic strategies in delay tolerant networks from an energetic point of view: main issues and performance evaluation. J. Networks 10(01), 4–14 (2015)Herrera-Tapia, J., Manzoni, P., Hernández-Orallo, E., Calafate, C.T., Cano, J.-C.: Power consumption evaluation in vehicular opportunistic networks. In: IEEE 12th CCNC 2015 Workshops - VENITS, pp. 925–930, Las Vegas (2015)Erramilli, V., Crovella, M.: Forwarding in opportunistic networks with resource constraints. In: Proceedings of the third ACM workshop on Challenged networks - CHANTS 2008, pp. 41–47, San Francisco (2008)Fathima, G., Wahidabanu, R.: Buffer management for preferential delivery in opportunistic delay tolerant networks. Int. J. Wirel. Mob. Netw. (IJWMN) 3, 15–28 (2011)Pan, D., Ruan, Z., Zhou, N., Liu, X., Song, Z.: A comprehensive-integrated buffer management strategy for opportunistic networks. EURASIP J. Wirel. Commun. Netw. 2013(1), 1–10 (2013)Hernández-Orallo, E., Herrera-Tapia, J., Cano, J.-C., Calafate, C.T., Manzoni, P.: Evaluating the impact of data transfer time in contact-based messaging applications. IEEE Commun. Lett. 19, 1814–1817 (2015)de Abreu, C.S., Salles, R.M.: Modeling message diffusion in epidemical DTN. Ad Hoc Netw. 16, 197–209 (2014

Population history, phylogeography, and conservation genetics of the last Neotropical mega-herbivore, the lowland tapir (Tapirus terrestris)

<p>Abstract</p> <p>Background</p> <p>Understanding the forces that shaped Neotropical diversity is central issue to explain tropical biodiversity and inform conservation action; yet few studies have examined large, widespread species. Lowland tapir (<it>Tapirus terrrestris</it>, Perissodactyla, Tapiridae) is the largest Neotropical herbivore whose ancestors arrived in South America during the Great American Biotic Interchange. A Pleistocene diversification is inferred for the genus <it>Tapirus </it>from the fossil record, but only two species survived the Pleistocene megafauna extinction. Here, we investigate the history of lowland tapir as revealed by variation at the mitochondrial gene Cytochrome <it>b</it>, compare it to the fossil data, and explore mechanisms that could have shaped the observed structure of current populations.</p> <p>Results</p> <p>Separate methodological approaches found mutually exclusive divergence times for lowland tapir, either in the late or in the early Pleistocene, although a late Pleistocene divergence is more in tune with the fossil record. Bayesian analysis favored mountain tapir (<it>T. pinchaque</it>) paraphyly in relation to lowland tapir over reciprocal monophyly, corroborating the inferences from the fossil data these species are sister taxa. A coalescent-based analysis rejected a null hypothesis of allopatric divergence, suggesting a complex history. Based on the geographic distribution of haplotypes we propose (<it>i</it>) a central role for western Amazonia in tapir diversification, with a key role of the ecological gradient along the transition between Andean subcloud forests and Amazon lowland forest, and (<it>ii</it>) that the Amazon river acted as an barrier to gene flow. Finally, the branching patterns and estimates based on nucleotide diversity indicate a population expansion after the Last Glacial Maximum.</p> <p>Conclusions</p> <p>This study is the first examining lowland tapir phylogeography. Climatic events at the end of the Pleistocene, parapatric speciation, divergence along the Andean foothill, and role of the Amazon river, have similarly shaped the history of other taxa. Nevertheless further work with additional samples and loci is needed to improve our initial assessment. From a conservation perspective, we did not find a correspondence between genetic structure in lowland tapir and ecogeographic regions proposed to define conservation priorities in the Neotropics. This discrepancy sheds doubt into this scheme's ability to generate effective conservation planning for vagile species.</p

The CIM-UVigo plug-in hybrid propulsion vessel for coastal oceanographic research: a tool for the ecological transition

Peer Reviewe

Role of biological and non biological factors in congestive heart failure mortality: PREDICE-SCORE: A clinical prediction rule

Background: Congestive heart failure (HF) is a chronic, frequent and disabling condition but with a modifiable course and a large potential for improving. The aim of this project was to develop a clinical prediction model of biological and non biological factors in patients with first diagnosis of HF that facilitates the risk-stratification and decision-making process at the point of care. Methods and Results: Historical cohort analysis of 600 patients attended at three tertiary hospitals and diagnosed of a first episode of HF according Framingham criteria. There were followed 1 year. We analyzed sociodemographic, clinical and laboratory data with potential prognostic value. The modelling process concluded into a logistic regression multivariable analysis and a predictive rule: PREDICE SCORE. Age, dependency for daily basic activities, creatinine clearance, sodium levels at admission and systolic dysfunction diagnosis (HF with left ventricular ejection fraction &lt; 40%) were the selected variables. The model showed a c-statistic of 0.763. PREDICE Score, has range of 22 points to stratifications of 1-year mortality. Conclusions: The follow-up of 600 patients hospitalized by a first episode of congestive HF, allowed us to obtain a predictive 1 year mortality model from the combination of demographic data, routine biochemistry and easy handling social and functional variables at the point of care. The variables included were non-invasive, undemanding to collect, and widely available. It allows for risk stratification and therapeutical targeting and may help in the clinical decisions process in a sustainable way

Identification and relationship of the autochthonous ‘Romé’ and ‘Rome Tinto’ grapevine cultivars

The ‘Romé’ variety is considered an Andalusian (southern region in Spain) autochthonous black grape cultivar. However, several white and black grapevine accessions are known by this name, according to Vitis International Variety Catalogue. The aim of the present work was to clarify the identity of the ‘Romé’ and ‘Rome Tinto’ as black grapevine cultivar. Eight accessions known as ‘Romé’ and two as ‘Rome Tinto’ were analyzed using 30 OIV descriptors and 22 SSR loci. The morphologic and genetic analysis showed that all accessions studied presented the same genotype and phenotype and grouped with South Spanish cultivars. This study helps to clarify the confusion over the identity of ‘Romé’ grapevine cultivar, and provides a solid basis to develop a germplasm collection to protect grapevine diversity and to recover cultivars that may be in danger of extinction