Search results for "Investigacion"

Testing invariance between web and paper students satisfaction surveys. A case study

2017

[EN] Purpose: This paper studied the measurement invariance (MI) across web-based and paper-based surveys to evidence if both techniques of data collection can be regarded as equivalent. Design/methodology: We develop a multigroup confirmatory factor analysis (MGCFA) with Maximum Likelihood Estimation to asses measurement invariance of the Job Diagnostic Survey (JDS) adapted to teaching, with data collected from paper and web surveys. Sample from paper surveys was constituted by 294 student of a Spanish public university in the academic years 2007-08, 2008-09 and 2009-10. Internet surveys were administered through an open source survey application called Lime Survey. We received 241 complet…

Minimizing weighted earliness-tardiness on parallel machines using hybrid metaheuristics

2015

We consider the problem of scheduling a set of jobs on a set of identical parallel machines where the objective is to minimize the total weighted earliness and tardiness penalties with respect to a common due date. We propose a hybrid heuristic algorithm for constructing good solutions, combining priority rules for assigning jobs to machines and a local search with exact procedures for solving the one-machine subproblems. These solutions are then used in two metaheuristic frameworks, Path Relinking and Scatter Search, to obtain high quality solutions for the problem. The algorithms are tested on a large number of test instances to assess the efficiency of the proposed strategies. The result…

Noise fiber lasers

2021

In this paper, we present a brief review of the noise operation mode of fiber lasers. These lasers were studied recently by collaborative group that includes researchers, professors, and Ph.D. students from the Centro de Investigaciones en Optica, A.C. (Leon, Guanajuato, Mexico) and from the Universidad de Valencia (Valencia, Spain). Meanwhile, the pioneer works in this topic important for understanding the physics behind fiber lasers’ operation and for practical applications were done with the active participation of Dr. Evgeny Kuzin from the Instituto Nacional de Astrofisica, Optica y Electronica (Puebla, Mexico) and Dr. Georgina Beltrán-Pérez from the Benemérita Universidad Autónoma de P…

Analyse de la planification espagnole comme processus de decision politique

1977

Rapport sur les travaux effectués par M. Vidal-Beneyto sous le titre: "Analyse de la planification espagnole comme processus de décision politique" e…

1981

Disinformation in Facebook Ads in the 2019 Spanish General Election Campaigns

2021

Producción Científica

Metabolic flux understanding of Pichia pastoris grown on heterogenous culture media

2014

[EN] Within the emergent field of Systems Biology, mathematical models obtained from physical chemical laws (the so-called first principles-based models) of microbial systems are employed to discern the principles that govern cellular behaviour and achieve a predictive understanding of cellular functions. The reliance on this biochemical knowledge has the drawback that some of the assumptions (specific kinetics of the reaction system, unknown dynamics and values of the model parameters) may not be valid for all the metabolic possible states of the network. In this uncertainty context, the combined use of fundamental knowledge and data measured in the fermentation that describe the behaviour…

An evaluation of the environmental factors for supply chain strategy decisions using grey systems and composite indicators

2020

[EN] The purpose of this work is to assess the importance of environmental factors in a supply chain with four partners as a preliminary step to select the competitive strategies and objectives. To achieve this purpose, a real case study was carried out in a footwear supply chain, in which two approaches were used: the grey system theory and uncertainty analysis tools for composite indicators. In order to validate both approaches, a seven-phase research methodology was developed and applied to our case study. In addition, the priorization of environmental factors was calculated individually for each partner. The results allow managers to establish the competitive strategy that best suits th…

Propiedades Psicométricas de la Versión Española del Cancer Survivors¿ Unmet Needs (CaSUN-S) en Cáncer de Mama

2021

[ES] el Cancer Survivors¿ Unmet Needs (CaSUN) ha sido desarrollado para esta población, pero varias cuestiones sobre sus propiedades estructurales permanecen inconclusas. Método: este estudio prueba el modelo teórico, la solución empírica de los autores originales y una nueva propuesta racional del CaSUN utilizando Análisis Factorial Confi rmatorio; también analiza su fi abilidad y validez convergente. 566 supervivientes de cáncer de mama completaron el CaSUN, el Inventario Breve de Síntomas-18 (BSI-18) y el Quality of Life in Adult Cancer Survivors (QLACS). Resultados: el modelo propuesto de cinco dominios (efectos físicos, efectos psicológicos, atención integral e información, cuestiones …

Scientists’ engagement in knowledge transfer and exchange: Individual factors, variety of mechanisms and users

2018

[EN] This article aims to provide a deeper understanding of the individual factors behind scientists' involvement in a wide variety of knowledge transfer and exchange (KTE) activities. By doing so, the article addresses three major shortcomings in the literature. First, this article considers scientists' involvement in both formal and informal KTE activities. Secondly, the study focuses not only on KTE activities with the private sector, but also with other types of agents. Thirdly, the article adopts an individual approach to distinguish between three types of KTE predictors: individual capacities, training and career trajectories, and motivations. Overall, the results of the regression mo…