Search results for "ESA"

Asymmetry matters: Dynamic half-way points in bidirectional labeling for solving shortest path problems with resource constraints faster

2017

Abstract With their paper “Symmetry helps: Bounded bi-directional dynamic programming for the elementary shortest path problem with resource constraints” [Discrete Optimization 3, 2006, pp. 255–273] Righini and Salani introduced bounded bidirectional dynamic programming (DP) as an acceleration technique for solving variants of the shortest path problem with resource constraints (SPPRC). SPPRCs must be solved iteratively when vehicle routing and scheduling problems are tackled via Lagrangian relaxation or column-generation techniques. Righini and Salani and several subsequent works have shown that bounded bidirectional DP algorithms are often superior to their monodirectional counterparts, s…

Probabilistic cross-validation estimators for Gaussian process regression

2018

Gaussian Processes (GPs) are state-of-the-art tools for regression. Inference of GP hyperparameters is typically done by maximizing the marginal log-likelihood (ML). If the data truly follows the GP model, using the ML approach is optimal and computationally efficient. Unfortunately very often this is not case and suboptimal results are obtained in terms of prediction error. Alternative procedures such as cross-validation (CV) schemes are often employed instead, but they usually incur in high computational costs. We propose a probabilistic version of CV (PCV) based on two different model pieces in order to reduce the dependence on a specific model choice. PCV presents the benefits from both…

Empiricism and Relationism Intertwined: Hume and Einstein’s Special Theory of Relativity

2016

Einstein acknowledged that his reading of Hume influenced the development of his special theory of relativity. In this article, I juxtapose Hume’s philosophy with Einstein’s philosophical analysis related to his special relativity. I argue that there are two common points to be found in their writings, namely an empiricist theory of ideas and concepts, and a relationist ontology regarding space and time. The main thesis of this article is that these two points are intertwined in Hume and Einstein.

Looking towards the Future of Language Assessment: Usability of Tablet PCs in Language Testing

2016

[EN] This research addresses the change in how the Spanish University Entrance Examination can be delivered in the future. There is a wide acknowledgement that computer tests are very demanding for the delivering institutions which makes computer language testing difficult to implement. However, the use of tablet PCs can facilitate the delivery at even lower cost than the regular computer based language testing. 183 students in their last year of high school took a computer based language test which included reading, writing, listening and speaking. The research aspects were 1) whether they feel at ease with the tablet PC exam; 2) if they felt that visual aspects were accessible and 3) whet…

Las voces del interior rural valenciano: recursos naturales y resistencias al desarrollo

2020

[EN] This paper shows the results of two territorial diagnoses for employment and local development carried out in two rural regions of the province of Valencia. These diagnostics showed that these territories have abundant natural resources, but that lack of competent actors to dynamize them properly; either because they lack the means to do so (access to sources of financing, transport or basic infrastructure), or because they are not trained for it (aging population with lack of training), or because they do not have enough initiative (installed in a comfort zone).

A Tool to Assess Architectural Education from the Sustainable Development Perspective and the Students' Viewpoint

2021

[EN] Architectural education plays a fundamental role in achieving sustainable development by training future professionals who can contribute to sustainability through their practice. Nevertheless, to ensure the introduction of sustainable development in the education of future architects, it is fundamental to understand what is being done and what could be improved. Despite this, a big gap has been detected in the assessment of architectural education in Spain and worldwide. Thus, a close-ended questionnaire for students has been designed based on the outcomes from a literature review, exploratory interviews with specialists, and the qualitative analysis of two schools of architecture. Ad…

Force Field for Water over Pt(111): Development, Assessment, and Comparison

2018

Metal/water interfaces are key in many natural and industrial processes, such as corrosion, atmospheric, or environmental chemistry. Even today, the only practical approach to simulate large interfaces between a metal and water is to perform force-field simulations. In this work, we propose a novel force field, GAL17, to describe the interaction of water and a Pt(111) surface. GAL17 builds on three terms: (i) a standard Lennard-Jones potential for the bonding interaction between the surface and water, (ii) a Gaussian term to improve the surface corrugation, and (iii) two terms describing the angular dependence of the interaction energy. The 12 parameters of this force field are fitted again…

Sexualitat en persones grans: Claus per entendre la satisfacció sexual i el seu vincle amb la salut sexual

2019

La satisfacció sexual s?ha convertit en una qüestió important dintre dels estudis sobre sexualitats, dels que sistemàticament les persones grans queden excloses al reduir la seua sexualitat a aspectes relacionats amb la mala salut. En aquest estudi s?analitza la satisfacció sexual amb la parella d?aquest grup de població a través de la Encuesta Nacional de Salud Sexual, prenent com a base el model biopsicosocial de la sexualitat (DeLamater, 2002) i considerant el gènere i diferents grups d?edat. Els resultats indiquen el caràcter multifactorial de la satisfacció sexual, prioritzant elements de natura relacional, social i cultural per sobre de l?estat de salut.

Trabajadores migrantes en la logística holandesa. El papel de reclutadoras y agencias de trabajo temporal en la producción de vulnerabilidad

2021

Repeatability of in-vitro optical quality measurements of intraocular lenses with a deflectometry technique effect of the toricity

2018

Aim To evaluate the repeatability of an optical device for measuring the Zernike coefficients of toric intraocular lenses (IOLs) and assess whether its toricity has any impact in its repeatability. Methods An experienced technician used the NIMO TR1504 to measure the Zernike coefficients 30 times for an aperture of 4.50 mm for all lenses included. The IOLs included were divided into two group: toric and non-toric ones. The cylindrical powers of the toric lenses included in the present study were 1.00, 1.50, 2.25, 3.00 and 3.75 D. Finally, the repeatability of the NIMO TR1504 was described in terms of within subject standard deviation (Sw) and repeatability limit. Results The Sw was smaller …