Rio Gallegos, Argentina

The National University of Austral Patagonia is an Argentine national university in Santa Cruz Province. The university is divided into four campuses, located in the cities of Caleta Olivia , Río Gallegos , San Julián and Río Turbio , and was founded in 1995, by national law 24.446. Wikipedia.

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Constanzo M.A.,National University of Patagonia Austral | Casas S.,National University of Patagonia Austral
Proceedings of the 2016 42nd Latin American Computing Conference, CLEI 2016 | Year: 2016

Web frameworks are tools for building web applications, through different mechanisms (components, classes, templates, descriptors, configuration files, etc.) these tools enable rapid application development. The usability evaluation to web frameworks can help developers in comparing and selecting them, and help to identify weaknesses and make improvements. Documentation resources and supports available on official websites, (books, tutorials, get started, videos, examples, community, blogs, forums, github, stack overflow, wikis, chats, mailing lists) generally are intended to assist and support the developer in using the framework, these elements should be analyzed as determinants of usability and quality from attributes, metrics and measures. This paper proposes a set of elements for evaluating the usability of support, from the analysis of available and published resources of 17 web frameworks, considered among very popular, recognized and used in web development communities. An experience of this proposal implementation is also presented. © 2016 IEEE.

Enriquez J.,National University of Patagonia Austral | Casas S.,National University of Patagonia Austral
Proceedings of the 2016 42nd Latin American Computing Conference, CLEI 2016 | Year: 2016

The widespread use of mobile devices and the heterogeneity of the users involve changes for usability evaluating of mobile applications. It is important to have methodologies and tools to perform usability specific studies for this type of applications in which the context of use is constantly changing. It is necessary that the usability tests are transparent for the user, usability and context data are automatically collected, the test code are not intrusive in the tested application and the tests support the variability of the devices. To achieve the above features, this article presents a framework called FUsAM (Framework of Usability for Mobile Applications) which is extensible and can generate and integrate usability testing in mobile applications. The design and implementation approach is based on Software Product Line (SPL) combined with Features Oriented Programming (FOP) and Aspect Oriented Programming (AOP). A case study is also presented to prove the functionality. © 2016 IEEE.

Villagra A.,National University of Patagonia Austral | Alba E.,University of Malaga | Leguizamon G.,National University of San Luis
Computational Intelligence and Neuroscience | Year: 2016

This work presents the results of a new methodology for hybridizing metaheuristics. By first locating the active components (parts) of one algorithm and then inserting them into second one, we can build efficient and accurate optimization, search, and learning algorithms. This gives a concrete way of constructing new techniques that contrasts the spread ad hoc way of hybridizing. In this paper, the enhanced algorithm is a Cellular Genetic Algorithm (cGA) which has been successfully used in the past to find solutions to such hard optimization problems. In order to extend and corroborate the use of active components as an emerging hybridization methodology, we propose here the use of active components taken from Scatter Search (SS) to improve cGA. The results obtained over a varied set of benchmarks are highly satisfactory in efficacy and efficiency when compared with a standard cGA. Moreover, the proposed hybrid approach (i.e., cGA+SS) has shown encouraging results with regard to earlier applications of our methodology. © 2016 Andrea Villagra et al.

Alba E.,University of Malaga | Villagra A.,National University of Patagonia Austral
Studies in Computational Intelligence | Year: 2013

Cellular Genetic Algorithm (cGA) and Particle Swam Optimization (PSO) are two powerful metaheuristics being used successfully since their creation for the resolution of optimization problems. In this work we present two hybrid algorithms based on a cGA with the insertion of components from PSO. We aim to achieve significant numerical improvements in the results obtained by a cGA in combinatorial optimization problems. We here analyze the performance of our hybrids using a set of different problems. The results obtained are quite satisfactory in efficacy and efficiency. © 2013 Springer-Verlag Berlin Heidelberg.

Vidal P.,National University of Patagonia Austral | Alba E.,University of Malaga
Studies in Computational Intelligence | Year: 2010

The availability of low cost powerful parallel graphic cards has estimulated a trend to implement diverse algorithms on Graphic Processing Units (GPUs). In this paper we describe the design of a parallel Cellular Genetic Algorithm (cGA) on a GPU and then evaluate its performance. Beyond the existing works on masterslave for fitness evaluation, we here implement a cGA exploiting data and instructions parallelism at the population level. Using the CUDA language on a GTX-285 GPU hardware, we show how a cGA can profit from it to create an algorithm of improved physical efficiency and numerical efficacy with respect to a CPU implementation. Our approach stores individuals and their fitness values in the globalmemory of the GPU. Both, fitness evaluation and genetic operators are implemented entirely on GPU (i.e. no CPU is used). The presented approach allows us benefit from the numerical advantages of cGAs and the efficiency of a low-cost but powerful platform. © 2010 Springer-Verlag Berlin Heidelberg.

Lizarralde Z.I.,National University of Patagonia Austral | Pittaluga S.,National University of Patagonia Austral
Thalassas | Year: 2011

The aim of this work was to analyze spatial and temporal variations in composition and abundance of benthic species assemblages in an intertidal environment of the Río Gallegos Estuary, Patagonia, Argentina (51° 35' S 69° W). Species distribution and its temporal fluctuations were analyzed using multivariate statistical methods. Different species assemblages were observed, their distribution being related to the tidal level and type of intertidal sediment. The polychaete Scolecolepides uncinatus was dominant in a species assemblage restricted to the high intertidal levels, which are characterized by silty clay sediments. At the intermediate intertidal level, the number of species and total macrofauna abundance increased; at this level, the clam Darina solenoides and the mussel Mytilus edulis platensis were dominant. At the low levels, which are composed of fine sediments, the polychaete Clymenella minor and the bivalve Mysella sp. were dominant. Temporal variations detected in species abundance were mainly due to the incorporation of recruits in the population, especially of the most abundant species.

Montani H.,National University of Patagonia Austral | Schaposnik F.A.,National University of La Plata
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

We construct fermionic Lagrangians with anisotropic scaling z=2, the natural counterpart of the usual z=2 Lifshitz field theories for scalar fields. We analyze the issue of chiral symmetry, construct the Noether axial currents and discuss the chiral anomaly giving explicit results for two-dimensional case. We also exploit the connection between detailed balance and the dynamics of Lifshitz theories to find different z=2 fermionic Lagrangians and construct their supersymmetric extensions. © 2012 American Physical Society.

Brunini A.,National University of Patagonia Austral | Zanardi M.,National University of La Plata | Zanardi M.,CONICET
Monthly Notices of the Royal Astronomical Society | Year: 2016

We present numerical simulations of the evolution of synthetic transneptunian binaries (TNBs) under the influence of the solar perturbation, tidal friction, and collisions with the population of classical Kuiper belt objects (KBOs).We show that these effects, acting together, have strongly sculpted the primordial population of TNBs. If the population of classical KBOs have a powerlawsize distribution as the ones that are inferred from recent observational surveys, the fraction of surviving binaries at present would be ~70 per cent of the primordial population. The orbits of the surviving synthetic systems match reasonably well the observed sample. The collisional process excites the mutual orbital eccentricity of the binaries, acting against the effect of tides. Therefore only ~10 per cent of the objects reach total orbital circularization (e ≤ 10-4). In addition, our results predict that the population of contact binaries in the transneptunian region should be small. Ultrawide binaries are naturally obtained by the combined action of Kozai cycles and tidal friction and collisional evolution, being the number and orbital distribution of them very similar to the ones of the observed population. © 2015 The Authors.

The results of actualistic taphonomic studies in Patagonia aimed at evaluating the preservation potential of vertebrates with different body sizes are presented. Large vertebrates include the guanaco (Lama guanicoe); the South American sea lion (Otaria flavescens), and a flightless bird belonging to the Ratites, the Lesser Rhea (Rhea pennata). Small vertebrates are flying birds and a member of the Spheniscidae Family, the Magellanic penguin (Spheniscus magellanicus). The large vertebrate bone record is the result of a long period of exposure on the ground surface, and its destruction is mainly due to weathering. The flying birds and penguin bone records are instead conditioned by a shorter subaerial exposure time. The future fossil records of these two groups vertebrates will be thus completely different as regards their integrity (sensu Binford, 1981) and their tendency towards spatial and temporal mixing.

Borella F.,CONICET | Cruz I.,National University of Patagonia Austral
Quaternary International | Year: 2012

Archaeological deposits in continental Patagonia that allow an adequate discussion of the exploitation of seabirds, particularly the Spheniscidae, are scarce. In many cases, characteristics of bone assemblages seem to indicate the natural incorporation of penguin bones into archaeological contexts. This suggests it is not always possible to support the argument that the presence of penguin remains indicates, a priori, consumption by humans. The Bajada de los Pescadores (BP2) site, San Matías Gulf (Río Negro, Patagonia, Argentina), provides a case study that allows the origin of these deposits and their contents to be evaluated in terms of the exploitation of penguins and other marine resources by hunter-gatherers during the Late Holocene. This paper discusses the origin of the archaeological deposit, its context, and the agents involved in its formation. The analysis used criteria formulated previously in the framework of actualistic taphonomic observations, with the aim of assessing the integrity of this sample, and evaluating its contribution towards clarifying the role of penguins in the subsistence of people on the northern Patagonian coast. © 2012 Elsevier Ltd and INQUA.

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