1864‐1903: Progreso, academicismo y arte prehistórico. Sustrato sociocultural del arte lúdico.

En este artículo se reflexiona sobre la manera en que influyeron en la primera fase de la investigación sobre el arte paleolítico, o del arte lúdico (1864‐1903), el contexto social, cultural e intelectual de finales del s. XIX y las primeras décadas del s. XX, el transformismo, el ideal de progreso, la etnografía, etc. Se hace especial hincapié en cómo el contexto históricoartístico (“arte por el arte”, conflicto entre academicismo y la incipiente renovación plástica) mediatizó la forma de mirar y enjuiciar las manifestaciones artísticas paleolíticas.------This article reflects on the way the social, cultural and intellectual context at the end of nineteenth and the first decades of the XXth centuries, influenced the first phase of the investigation about the palaeolithic art, or playful art (1864‐1903), and also the transformism, the idea of progress, the ethnography, and so on. This article emphasized how the historical‐artistic context (ʺArt for artʹs sakeʺ, conflict between academic world and the incipient plastic renovation) mediatized the way of looking and judging the artistic palaeolithic manifestations

La cueva de Basaula (Baríndano) y el arte postpaleolítico navarro

En este artículo se analiza y estudia el corpus parietal de los grafismos localizados en la Galería del Felino de la Cueva de Basaula, y se expone un estado de la cuestión sobre la comprensión del arte postpaleolítico esquemático peninsular y navarro; así como del fenómeno complejo del arte esquemático abstracto

El yacimiento de Ordoiz (Estella)

Se expone un estado de la cuestión sobre el yacimiento de Ordoiz (Estella), con los datos disponibles tras la intervención de 1998. Partiendo de estos datos se analiza la cultura material del asentamiento, modos de vida y rasgos ecológicos/paisajísticos. A la vista de las dificultades derivadas de su conservación, se le atribuye una cronología del Edad del Bronce genérica

Bootstrapping pairs in Distance-Based Regression

Distance-based regression is a prediction method consisting of two steps: from distances between observations we obtain latent variables which, in turn, are the regressors in an ordinary least squares linear model. Distances are computed from actually observed predictors by means of a suitable dissimilarity function. Being in general nonlinearly related with the response their selection by the usual F tests is unavailable. In this paper we propose a solution to this predictor selection problem, by defining generalized test statistics and adapting a non-parametric bootstrap method to estimate their p-values. We include a numerical example with automobile insurance data.non-parametric bootstrap, automobile insurance data, predictors selection, distance-based regression

Compilability of Abduction

Abduction is one of the most important forms of reasoning; it has been successfully applied to several practical problems such as diagnosis. In this paper we investigate whether the computational complexity of abduction can be reduced by an appropriate use of preprocessing. This is motivated by the fact that part of the data of the problem (namely, the set of all possible assumptions and the theory relating assumptions and manifestations) are often known before the rest of the problem. In this paper, we show some complexity results about abduction when compilation is allowed

Self-organization in service discovery in presence of noncooperative agents

[EN] Self-organization and cooperation of agents in open societies play an important role in the success of the service discovery process. Self-organization allows agents to deal with dynamic requirements in service demand. Moreover, in distributed environments where service discovery is carried out by agents that only have a partial view of the system, cooperation with neighbors is a key issue in order to locate the required services. However, cooperation is not always present in open agent societies. With this motivation, we present a set of mechanisms that consider self-organization actions and incentives to adapt the structure of the society to the service demand and to promote a cooperative behavior among agents in open societies.This work is supported by the Ministerio de Economía y Competitividad TIN2011-27652-C03-01 and TIN2012-36586-C03-01 projects and PROMETEOII/2013/019, the Program Valorización y Recursos Conjuntos de IþDþi VLC/CAMPUS and the Ministerio de Educación, Cultura y Deporte as part of the Campus of International Excellence Program SP2014800.Del Val Noguera, E.; Rebollo Pedruelo, M.; Botti Navarro, VJ. (2016). Self-organization in service discovery in presence of noncooperative agents. Neurocomputing. 176:81-90. https://doi.org/10.1016/j.neucom.2014.11.085S819017

Experimental Study of Tapping Wear Mechanisms on Nodular Cast Iron

AbstractTapping by cutting is one of the most common operations in manufacturing. This multi-teeth tool, known as a tap, cuts the thread in a hole when the piece has a high added value. The thread quality is ensured when the tap is new or slightly worn, yet when tap wear is high; the quality of profiles exceeds tolerance limits and therefore a defect occurs in the manufacturing line.The aim of this paper is to study the tap wear of titanium nitride coated taps measured on nodular cast iron. The level of tap wear is determined by optical images and the wear mechanics are classified by scanning images and energy dispersion spectroscopy analysis. The results highlight that the critical part in measured taps is between the last chamfer and the first cylinder teeth and, consequently, the thread profile is under-sized. Beside adhesive wear, coating removal and chipping are the main wear aspects during tapping operations