Papers by OSCAR SAMUEL DIAZ GARCIA
Estudios de Literatura Colombiana, Nov 2, 2011
Applied Sciences, 2020
In this work, a cost-effective wind resource method specifically developed for the ROSEO-BIWT (Bu... more In this work, a cost-effective wind resource method specifically developed for the ROSEO-BIWT (Building Integrated Wind Turbine) and other Building Integrated Wind Turbines is presented. It predicts the wind speed and direction at the roof of an previously selected building for the past 10 years using reanalysis data and wind measurements taken over a year. To do so, the reanalysis wind speed data is calibrated against the measurements using different kinds of quantile mapping, and the wind direction is predicted using random forest. A mock-up of a building and a BIWT were used in a wind tunnel to perform a small-scale experiment presented here. It showed that energy production is possible and even enhanced over a wide range of attack angles. The energy production estimations made with the best performing kind of calibration achieved an overall relative error of 6.77% across different scenarios.
Forest Science, 2021
Models at various levels of resolution are commonly used for both forest management and ecologica... more Models at various levels of resolution are commonly used for both forest management and ecological research. They all have comparative advantages and disadvantages, making desirable a better understanding of the relationships between various approaches. Accounting for crown and root morphological plasticity in the limit where equilibrium among neighbors is reached (perfect plasticity) transforms spatial models into nonspatial, distance-independent versions. The links between spatial and nonspatial models obtained through a perfect plasticity assumption are more realistic than ignoring spatial structure by a mean field approximation. This article also reviews the connection between distance-independent models and size distributions and how distributions evolve over time and relate to whole-stand descriptions. In addition, some ways in which stand-level knowledge feeds back into detailed individual-tree formulations are demonstrated. This presentation is intended to be accessible to n...
Computational Statistics, 2018
Stochastic differential equations (SDEs) are increasingly used in longitudinal data analysis, com... more Stochastic differential equations (SDEs) are increasingly used in longitudinal data analysis, compartmental models, growth modelling, and other applications in a number of disciplines. Parameter estimation, however, currently requires specialized software packages that can be difficult to use and understand. This work develops and demonstrates an approach for estimating reducible SDEs using standard nonlinear least squares or mixed-effects software. Reducible SDEs are obtained through a change of variables in linear SDEs, and are sufficiently flexible for modelling many situations. The approach is based on extending a known technique that converts maximum likelihood estimation for a Gaussian model with a nonlinear transformation of the dependent variable into an equivalent least-squares problem. A similar idea can be used for Bayesian maximum a posteriori estimation. It is shown how to obtain parameter estimates for reducible SDEs containing both process and observation noise, including hierarchical models with either fixed or random group parameters. Code and examples in R are given. Univariate SDEs are discussed in detail, with extensions to the multivariate case outlined more briefly. The use of well tested and familiar standard software should make SDE modelling more transparent and accessible.
Ecological Modelling, 2017
Mixed-species growth models are needed as a synthesis of ecological knowledge and for guiding for... more Mixed-species growth models are needed as a synthesis of ecological knowledge and for guiding forest management. Individual-tree models have been commonly used, but the difficulties of reliably scaling from the individual to the stand level are often underestimated. Emergent properties and statistical issues limit their effectiveness. A more holistic modelling of aggregates at the whole stand level is a potentially attractive alternative. This work explores methodology for developing biologically consistent dynamic mixture models where the state is described by aggregate stand-level variables for species or age/size cohorts. The methods are demonstrated and tested with a two-cohort model for spruce-aspen mixtures named SAM. The models combine single-species submodels and submodels for resource partitioning among the cohorts. The partitioning allows for differences in competitive strength among species and size classes, and for complementarity effects. Height growth reduction in suppressed cohorts is also modelled. SAM fits well the available data, and exhibits behaviors consistent with current ecological knowledge. The general framework can be applied to any number of cohorts, and should be useful as a basis for modelling other mixed-species or uneven-aged stands.
Journal of Neurological Surgery Part B: Skull Base, 2017
Objective This study presents a comparative analysis of cost efficacy between the microscopic and... more Objective This study presents a comparative analysis of cost efficacy between the microscopic and endoscopic transsphenoidal approaches, evaluating neurological outcome, extent of resection (EOR), and inpatient hospital costs. Design This study was a retrospective chart review. Setting This study was conducted at a tertiary care center. Participants The study group consisted of 68 patients with transsphenoidal surgeries between January 2007 and January 2014. Main Outcome Measures Two-sample t-tests and Pearson's chi-square test evaluated inpatient costs, quality-adjusted life years (QALYs), volumetric EOR, and neurological outcomes. Results Total inpatient costs per patient was $22,853 in the microscopic group and less ($19,736) in the endoscopic group (p ¼ 0.049). Operating room costs were $5,974 in the microscopic group and lower in the endoscopic group ($5,045; p ¼ 0.038). Operative time was 203.6 minutes in the microscopic group and 166.3 minutes in the endoscopic group (p ¼ 0.032). The QALY score, length of hospital stay, and postoperative outcomes were found to be similar between the two cohorts. Multivariate linear regression modeling suggested that length of stay (p < 0.001) and operative time (p ¼ 0.008) were important factors that influenced total inpatient costs following transsphenoidal surgery. Conclusion This study shows that transsphenoidal surgery is more cost effective with the endoscopic approach than with the microscopic approach and depends on efficiency in the operating room as well as reduction in the length of hospitalization.
La video-creación como estrategia de aprendizaje en el curso de apreciación de lo artístico de la UANL
Actas Ii Congreso Internacional Sociedad Digital Espacios Para La Interactividad Y La Inmersion Vol 1 2011 Isbn 978 84 939077 5 4 Pags 191 197, 2011
espanolEstamos inmersos en una cultura audiovisual y participamos de manera activa o pasiva en la... more espanolEstamos inmersos en una cultura audiovisual y participamos de manera activa o pasiva en la sociedad, que es construida por estimulos que con un poco o ausente comprension esta cultura puede estructurar la realidad, asi como orientar o condicionar el aprendizaje, pero tambien atrae, interesa o sensibiliza a los alumnos para crear una cultura de la imagen. Para los alumnos el video es una manifestacion habitual, que como recurso es muy versatil ya que se encuentra como medio de informacion, como instrumento de investigacion, como medio de expresion, como medio de evaluacion, motivador, instructivo o ludico, etc. La intencion de utilizar como estrategia de aprendizaje la video-creacion es que no se analice un video, sino que los alumnos vivan la experiencia de crear el significado al utilizar la sincronia de la imagen y lo auditivo, de acuerdo a una guia en un programa estructurado persiguiendo objetivos claros para su efectiva evaluacion. Se tuvo la experiencia de aplicar este recurso, de documentar su desarrollo y evaluar la pertinencia de esta estrategia, que permitio valorar su importancia y efectividad para el curso de apreciacion de lo artistico, y exponer el desarrollo de las competencias de manera satisfactoria en el curso, pero tambien existieron circunstancias que se tienen que adaptar de acuerdo a las caracteristicas unicas de cada grupo en donde se pretenda utilizar este recurso estrategico de aprendizaje. EnglishWe are in a media culture and we participate actively or passively in the society that is built by stimuli with little or absent understanding that culture can structure the reality as well to guide or condition the learning, but also attracts interest or sensitizes students to create a culture of image. For the students the video is a common manifestation, as a resource that is very versatile as it is as an information medium, as a research tool as a means of expression as a means of evaluating, motivating, informative or entertaining, and so on. Intention to use as a learning strategy video-creation is not to analyze a video, is that students live the experience of creating meaning by using the synchrony of the auditory image, according to a program guide structured pursuing clear objectives for their effective assessment. It had the experience of implementing this resource, documenting their development and the relevance of this strategy, which enabled it to assess their importance and effectiveness in the course of artistic appreciation, and exposing the development of skills satisfactorily in the course, but there are circumstances that need to be adapted according to the unique characteristics of each group where they intend to use this strategic resource for learning.
Redvet Revista Electronica De Veterinaria, 2009
Psicologia Sin Fronteras Revista Electronica De Intervencion Psicosocial Y Psicologia Comunitaria, 2007
Resumen. Casi medio siglo después de la declaración de los derechos del menor, la infancia se enc... more Resumen. Casi medio siglo después de la declaración de los derechos del menor, la infancia se encuentra en una situación dramática en la mayor parte del planeta y en determinados colectivos de las sociedades más prosperas. Las políticas de protección infantil llevadas a cabo por las instituciones se han mostrado incapaces de dar un cambio a esta realidad cada vez más preocupante. Hasta el momento no ha existido una representación social de la negligencia como forma de violencia en sí misma y como generadora de violencia explícita. Hacer visible los efectos de la negligencia y su gravedad permite plantear alternativas para poder hacerle frente. El adultismo, prioriza los derechos de los adultos sobre los de la infancia y supone la justificación de un funcionamiento de negligencia parental e institucional. Contar con una tipología de perfiles parentales negligentes proporciona más información sobre sus características y el modo adecuado de abordarlos. Además, el porcentaje de casos de negligencia existentes en una sociedad posibilita definir el grado de desprotección de su infancia y de su propia sostenibilidad.
Práctica 2. Role Playing, Trabajo en Equipo en Educación Infantil
Resolución de conflictos a través del diálogo y otras estrategias en un equipo de trabajo
Reportatge: Rèquiem per la premsa musical?
Capcalera Revista Del Col Legi De Periodistes De Catalunya, 2014
Revista Científica de Enfermería, 2013
Los traumatismos craneoencefálicos (TCE) constituyen un importante problema de salud pública en l... more Los traumatismos craneoencefálicos (TCE) constituyen un importante problema de salud pública en los países occidentales, por el elevado índice de mortalidad, discapacidad y la prolongada hospitalización que conllevan. Son la primera causa de muerte e incapacidad en la población menor de 45 años y una causa importante de pérdida prematura de vida productiva, de altos costes de atención médica y de pérdidas socioeconómicas grandes para la sociedad. El objetivo del estudio es revisar la literatura actual relacionada con los cuidados de Enfermería aplicados a los pacientes con TCE grave, así como la influencia de los mismos en la mejora de la práctica asistencial y en la calidad de vida de los pacientes y sus familias. Para la realización del trabajo se lleva a cabo una revisión narrativa de la literatura relacionada sobre los aspectos más importantes que influyen en la atención y cuidados de los pacientes con TCE grave. Se revisan las bases de datos MEDLINE, CUIDEN, BDIE, INDEX, CINAHL...
Revista Científica de Enfermería, 2014
OBJETIVOS: - Describir el modelo de control de la gestación y asistencia al parto domiciliario to... more OBJETIVOS: - Describir el modelo de control de la gestación y asistencia al parto domiciliario tomando como referencia Países Bajos. - Comparar la Tasa de Mortalidad Perinatal (TMP) de los países europeos donde sea usual el parto domiciliario con los que la mayoría de sus partos sean atendidos en el hospital. - Mostrar los datos de Tasa de Mortalidad en Países Europeos. - Abrir nuevas vías de investigación respecto al tema. MÉTODOS: Revisión bibliográfica mediante búsqueda en bases de datos y buscadores genéricos de Internet. RESULTADOS: Según un estudio holandés donde comparan tipo de parto y resultados obstétricos, no hay diferencias. Estudios PERISTAT I y II: después de Francia, Países Bajos tuvieron la mayor tasa de mortalidad fetal y la mayor tasa de mortalidad neonatal precoz. Estudio de Erasmus MC: en países similares a Países Bajos la TMP puede ser un 30% menos. Meta-análisis en American Journal of Obstetrics & Gynecology: los nacimientos planificados en casa de madres sanas...
Social Security Administration: Questions and Answers
La Prensa De San Antonio, Feb 25, 2001
Ciència, cultura i nova filosofia
La filosofía de la cultura no puede dejar fuera de su objeto de análisis la ciencia natural; La c... more La filosofía de la cultura no puede dejar fuera de su objeto de análisis la ciencia natural; La ciencia es cultura y ello hace necesario pensar en la cultura como conocimiento. Desde este artículo se procederá a un estudio de la relación entre humanidades y ciencias naturales por una parte y a la relación entre humanidades y filosofía por otra que conluirá que la filosofía no es una de las humanidades y, de serlo, lo será al mismo nivel de las matemáticas y la física. Se pedirá la inclusión de contenidos de ciencias naturales para una filosofía renovada que pueda abordar problemas necesarios para el tratamiento del panorama que presenta la ciencia natural. Por último se esbozarán unas consideraciones sobre los actuales planes de estudio en la universidad.Philosophy of culture can not ignore in its researches natural science. Science is a kind of culture and it makes it necessary to think about culture as knowledge. In this paper we will pay our attention to the analysis of the relationship between humanities and natural science in one hand, and between humanities and philosophy in the other hand. This will come to the conclusion that philosophy is not a part of humanities or,in the case it was, it will be a part of humanities the same way as mathemathics or physics are. We will ask for the inclussion of natural science contents into a new way of doing philosopy,which make it possible to deal with the landscape given by natural science. In the end, we will make some reflections on the new curricula at university
Renovables 2050. Un informe sobre el potencial de las energías renovables en la España Peninsular
Lecture Notes in Computer Science, 2002
In this contribution, we will study the influence of the three components of the Best-Worst Ant S... more In this contribution, we will study the influence of the three components of the Best-Worst Ant System (BWAS) algorithm. As the importance of each of them as the fact whether all of them are necessary will be analyzed. Besides, we will introduce a new algorithm called Best-Worst Ant Colony System by combining the basis of the Ant Colony System with the special components of the BWAS. The performance of different variants of these algorithms will be tested when solving different instances of the QAP.
In movement: New players in the construction of democracy in Spain, 1962–1977
Political Power and Social Theory, 2009
Specialised literature on democratisation has generally presented the Spanish case as the model o... more Specialised literature on democratisation has generally presented the Spanish case as the model of an elite-led political settlement. This approach forms the basis of the most widespread interpretation of Spain's transition to democracy as a work of top-down political engineering. However, this scholarship fails to pay sufficient attention to the capacity for agency of civil society and both “old” and “new” social movements. In fact, although there is no doubt that democracy arrived in Spain by means of a negotiated transition, it must not be forgotten that the pacts among elites were influenced, as is demonstrated here, by relentless social pressure among highly organised collective actors, including the Communist Party. This paper shows that protests by this organisation and other collective actors in the most socioeconomically underdeveloped provinces of Spain, most of which have been ignored by the most influential scholarship on the transition, were vitally important in the negotiated path to democracy. As such, it investigates the relationship between social unrest and political change through the study of provinces which, a priori, were considered to be socially and politically inactive. This analysis of popular mobilisation in poor and politically marginalised provinces enables a deeper theoretical and empirical understanding of the dynamics from below, which were fundamental in Spain's transition process.
Journal of Ambient Intelligence and Humanized Computing, 2011
The constant evolution of mobile devices and Information Technologies allows users to enjoy a new... more The constant evolution of mobile devices and Information Technologies allows users to enjoy a new variety of features that were unimaginable some years ago. In this sense, Ambient Intelligence (AmI) has emerged as a new discipline focused on people and aimed at facilitating their daily activities. This paper proposes a new definition model that helps designers to characterize collaborative e-learning systems based on AmI and Computer Supported Collaborative Learning. The use of mobile devices and Mobile Adhoc Networks is a key aspect in this model as they allow users to access resources from anywhere on demand. The proposed model is applied to a concrete case of study as an example of its application on real scenarios.
International Congress Series, 2003
We here describe a multiplex-PCR method to generate six overlapping short amplicons (100-130 bp) ... more We here describe a multiplex-PCR method to generate six overlapping short amplicons (100-130 bp) in two separate PCR reactions of non-overlapping fragments for full sequencing of the whole hypervariable region I (HV1). The performance of this multiplex system has been evaluated not only on ancient bone remains (5000-4000 BP) but also on different forensic samples with highly degraded DNA (bone remains, hair shafts,. . .) that yielded negative PCR results with the mtDNA amplification strategies usually employed in forensic genetics. The multiplex-PCR methodology described in this study also illustrates a potential high throughput strategy to reconstruct the sequence of both coding and non-coding regions of the mtDNA genome from ancient DNA.
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Papers by OSCAR SAMUEL DIAZ GARCIA