http://hdl.handle.net/2099/3329 2013-05-21T05:08:26Z http://hdl.handle.net/2099/1266 Title: El decadentismo como doctrina estética Authors: Vilar, Gerard 1987-01-01T00:00:00Z http://hdl.handle.net/2099/1738 Title: Fuzzy morphological operators in image processing Authors: Burillo López, Pedro; Frago Paños, Noé; Fuentes-González, Ramón Abstract: First of all, in this paper we propose a family of fuzzy implication operators, which the generalised Luckasiewicz's one, and to analyse the impacts of Smets and Magrez properties on these operators. The result of this approach will be a characterisation of a proposed family of inclusion grade operators (in Bandler and Kohout's manner) that satisfies the axioms of Divyendu and Dogherty. Second, we propose a method to define fuzzy morphological operators (erosions and dilations). A family of fuzzy implication operators and the inclusion grade are the basis for this method. 2003-01-01T00:00:00Z http://hdl.handle.net/2099/13318 Title: The new class of Kummer beta generalized distributions Authors: Pescim, R. R.; Cordeiro, G. M.; Demétrio, C. G. B.; Ortega, E. M. M.; Nadarajah, S. Abstract: Ng and Kotz (1995) introduced a distribution that provides g reater flexibility to extremes. We define and study a new class of distributions called the Kummer beta generalized family to extend the normal, Weibull, gamma and Gumbel distributions, among sev eral other well-known distributions. Some special models are discussed. The ordinary moments of a ny distribution in the new family can be expressed as linear functions of probability weighte d moments of the baseline distribution. We examine the asymptotic distributions of the extreme valu es. We derive the density function of the order statistics, mean absolute deviations and entro pies. We use maximum likelihood estimation to fit the distributions in the new class and illus trate its potentiality with an application to a real data set 2012-01-01T00:00:00Z http://hdl.handle.net/2099/13317 Title: A note on the use of supply-use tables in impact analyses Authors: Lenzen, Manfred; Rueda-Cantuche, José M. Abstract: Little attention has so far been paid to the problems inheren t in interpreting the meaning of results from standard impact analyses using symmetric input-outpu t tables. Impacts as well as drivers of these impacts must be either of the product type or of the in dustry type. Interestingly, since supply-use tables distinguish products and industries, th ey can cope with product impacts driven by changes in industries, and vice versa. This paper contrib utes in two ways. Firstly, the demand- driven Leontief quantity model, both for industry-by-indu stry as well as for product-by-product tables, is formalised on the basis of supply-use tables, thu s leading to impact multipliers, both for industries and products. Secondly, we demonstrate how the s upply-use formulation can improve the incorporation of disparate satellite data into input-o utput models, by offering both industry and product representation. Supply-use blocks can accept any m ix of industry and product satellite data, as long as these are not overlapping 2012-01-01T00:00:00Z http://hdl.handle.net/2099/13316 Title: On developing ridge regression parameters: a graphical investigation Authors: Muniz, Gisela; Golam Kibria, B. M.; Mansson, Kristofer Mansson; Shukur, Ghazi Abstract: In this paper we review some existing and propose some new est imators for estimating the ridge parameter. All in all 19 different estimators have been stud ied. The investigation has been carried out using Monte Carlo simulations. A large number of differe nt models have been investigated where the variance of the random error, the number of variabl es included in the model, the correlations among the explanatory variables, the sample s ize and the unknown coefficient vector were varied. For each model we have performed 2000 replicati ons and presented the results both in term of figures and tables. Based on the simulation study, w e found that increasing the number of correlated variable, the variance of the random error and increasing the correlation between the independent variables have negative effect on the mean s quared error. When the sample size increases the mean squared error decreases even when the cor relation between the independent variables and the variance of the random error are large. In a ll situations, the proposed estimators have smaller mean squared error than the ordinary least squa res and other existing estimators 2012-01-01T00:00:00Z http://hdl.handle.net/2099/13297 Title: Analysing visual receptive fields through generalised additive models with interactions Authors: Rodríguez Álvarez, María Xosé; Cadarso-Suárez, Carmen; González, Francisco Abstract: Visual receptive fields (RFs) are small areas of the visual fie ld where a stimulus induces a re- sponses of a particular neuron from the visual system. RFs ca n be mapped using reverse cross- correlation technique, which produces raw matrices contai ning both spatial and temporal informa- tion about the RF. Though this technique is frequently used i n electrophysiological experiments, it does not allow formal comparisons between RFs obtained un der different experimental condi- tions. In this paper we propose the use of Generalised Additi ve Models (GAM) including com- plex interactions, to obtain smoothed spatio-temporal ver sions of RFs. Moreover, the proposed methodology also allow for the statistical comparisons of t he RFs obtained across various experi- mental conditions. Data analysed here derive from studies o f neurons’ activity in the visual cortex of behaving monkeys. Our results suggest that the GAM-based technique proposed in this paper can be a flexible and powerful tool for assessing receptive fie ld properties 2012-01-01T00:00:00Z http://hdl.handle.net/2099/13296 Title: Iterative beam search for simple assembly line balancing with a fixed number of work stations Authors: Blum, Christian Abstract: The simple assembly line balancing problem (SALBP) concern s the assignment of tasks with pre-defined processing times to work stations that are arran ged in a line. Hereby, precedence constraints between the tasks must be respected. The optimi zation goal of the SALBP-2 variant of the problem concerns the minimization of the so-called cy cle time, that is, the time in which the tasks of each work station must be completed. In this work we p ropose to tackle this problem with an iterative search method based on beam search. The propose d algorithm is able to generate optimal solutions, respectively the best upper bounds, for 283 out of 302 test cases. Moreover, for 9 further test cases the algorithm is able to improve the c urrently best upper bounds. These numbers indicate that the proposed iterative beam search al gorithm is currently a state-of-the-art method for the SALBP-2 2011-01-01T00:00:00Z http://hdl.handle.net/2099/13293 Title: Ingenieros sin fronteras: un espacio académico para proyectos auto-sustenibles en torno a comunidades marginales Authors: Ramírez, María Catalina; Sanabria Céspedes, Juan Pablo; Duarte Gómez, Diana María Abstract: Ingenieros sin fronteras Colombia - ISF-COL, es un grupo de lnvestigaciòn que busca vincular a estudiantes, profesores y profeslonales de distintas ramas, que buscan trabajar proyectos de ingenieria con impacto social, siempre bajo la concepción de diseñar propuestas que sean sostenibles, económica y culturalmente viables para atender necesidades insatisfechas o potencializar las capacidades de comunidades marginales en Colombia. Este artículo presenta el desanollo,estructura y evolución del grupo de trabajo y cómo éste esta diseñado para que sus participantes conciban propuestas innovadoras y auto-sostenibles con temas como agua, medio ambiente, recursos naturales y emprendimiento. Al finalizar se realiza un analisis del impacto de este tipo de proyecto y la importancia en la académica de este tipo de espacios de formación.; Engineers without borders Colombia - ISF-COL, is a group that seeks to link lnvestigacion students, teachers and professionals from different fields, who seek to work engineering projects with social impact, always under the conception of design proposals that are sustainable, economically and culturally viable to meet unmet needs or potentiate the capabilities of marginalized communities in Colombia. This paper presents the desanollo, structure and evolution of group work and how it is designed for participants to devise innovative proposals and self-sustainable areas such as water, environment, natural resources and entrepreneurship. At the end of an analysis is made of the impact of this type of project and the importance in this type of academic training spaces. 2012-12-01T00:00:00Z http://hdl.handle.net/2099/13292 Title: La clasificación de la ciudad histórico-turística: una herramienta para la evaluación de la sostenibilidad Authors: Antonini, Alessandra Abstract: Este estudio se propone el objetivo de analizar la problemática de la sostenibilidad urbana, centrada en el caso de las ciudades histórico-turísticas, con el objetivo general de la creación de un sistema de indicadores de la sostenibilidad en ciudades histórico-turísticas pequeñas o medianas que se pueda aplicar a escala municipal para evaluar y monitorizar la sostenibilidad urbana en relación al turismo. Partiendo de la construcción de una visión sintética del problema en análisis, se propone la creación de modelos de referencia de ciudades histórico-turísticas capaces de tener en cuenta, entre otros factores, la estructura física de la ciudad y analizando la variación de los impactos en función de dicha organización espacial. Esto permite generar tipologías de ciudad, que pueden ser útiles a la hora de un primer análisis de un caso de estudio real. Una vez estructuradas las categorías, se identifican las medidas importantes para el análisis de la ciudad histórico-turística, comparando éstas con las categorías de ciudad creadas anteriormente, se genera un sistema de clasificación de las ciudades entre las diferentes categorías, a partir de los resultados de los indicadores. Una vez estructurada toda la metodología de análisis para la ciudad histórico-turística, esta se aplica al caso de la ciudad italiana de Alghero, situada en la isla de Sardegna.; This study proposes to analyze the problems of urban sustainability, focusing on the case of tourist-historic cities, with the overall goal of creating a system of indicators of sustainability in tourist-historic cities small or medium sized can be applied at the municipal level to assess and monitor urban sustainability in relation to tourism. Based on the construction of a synthetic view of the problem in analysis, we propose the creation of reference models tourist-historic cities able to take into account, among other factors, the physical structure of the city and analyzing the variation of impacts on function of the spatial organization. This produces types of city, which can be useful when a first analysis of a real case study. Once structured categories, identifies important steps in the analysis of tourist-historic city, comparing these to the city categories created above, generates a classification system of cities across different categories, based on the results indicators. Once all the structured analysis methodology for tourist-historic city, this applies to the case of the Italian city of Alghero, located on the island of Sardinia. 2012-12-01T00:00:00Z http://hdl.handle.net/2099/13291 Title: Aproximación a la estimación de la Huella Hídrica de la minería del oro en el Municipio de Segovia, Antioquia (Colombia) Authors: González Valencia, Juan Esteban; Montoya, L.J.; Botero, A.; Arévalo, D,; Valencia, V. Abstract: El siguiente artículo tiene como propósito estimar el impacto ambiental de la minería de oro mediante el indicador de Huella Hídrica en el municipio de Segovia (Antioquia), el cual permite no solo analizar el consumo real de agua en las etapas de extracción y beneficio del oro, sino que también permite cuantificar el grado de contaminación generado principalmente por los vertimientos de mercurio. En esta primera aproximación se tendrán en cuenta la Huella Hídrica Azul y la Huella Hídrica Gris. Los resultados obtenidos se convierten en una herramienta para la toma de decisiones en el municipio, ya que permiten direccionar el accionar público y privado hacia las actividades que más están afectando al recurso hídrico.; The following article aims to estimate the environmental impact of gold mining by the Water Foot Print indicator in the town of Segovia (Antioquia), which allows not only to analize the actual consumption of water in the stages of extraction and processing of gold, but also to quantify the degree of pollution generated mainly by mercury discharges. In this first approach will be considered the Blue and Grey Water Foot Print. The results become a tool for decision making in the town, as they allow direct the public and private actions to the activities that are affecting the water resource. 2012-12-01T00:00:00Z http://hdl.handle.net/2099/13290 Title: Metodologías multicriterio para toma de decisiones en gestión de proyectos: la integración de los agentes gestores como beneficio indirecto Authors: Armengou, Jaume; Aguado de Cea, Antonio Abstract: Las decisiones correctamente tomadas en la gestión de proyectos tienen en cuenta todos los componentes y todo su ciclo de vida pero, principalmente, a todos los agentes implicados. A través de un ejemplo (selección entre alternativas a la compra de una vivienda) se muestra directamente la integración de aspectos económicos, funcionales, sociales y ambientales. Así, para realizar la selección se contemplan: costes, vulnerabilidad, ubicación, estética, recursos naturales, sostenibilidad, etc. Indirectamente, se justifica que la adecuada aplicación en sí de la metodología integra a los agentes, atenuando la posibilidad de conflictos y logrando una mayor eficiencia en la gestión. La metodología como tal queda descrita para ser aplicada a cualquier otro proyecto.; Correct decision making in project management takes into account all of the components and the whole life-cycle of the project, but primarily focuses on all of the stakeholders. An example (deciding between alternative homes to buy) shows the integration of economic, functional, social and environmental requirements. In order to score alternatives, costs, vulnerability, location, aesthetics, natural resources, sustainability, etc. are considered. It is also justified, in an indirect way, that the proper application of the methodology integrates agents, lessening the possibility of conflict and achieving greater efficiency in management. The methodology, as described, is ready to be applied to any project. 2012-12-01T00:00:00Z http://hdl.handle.net/2099/13289 Title: A comparison of some confidence intervals for estimating the population coefficient of variation: a simulation study Authors: Gulhar, Monika; Golam Kibria, B.M.; Albatineh, Ahmed; Ahmed, Nasar U Abstract: This paper considers several confidence intervals for estim ating the population coefficient of variation based on parametric, nonparametric and modified m ethods. A simulation study has been conducted to compare the performance of the existing and new ly proposed interval estimators. Many intervals were modified in our study by estimating the va riance with the median instead of the mean and these modifications were also successful. Dat a were generated from normal, chi-square, and gamma distributions for CV = 0.1, 0.3, and 0. 5. We reported coverage probability and interval length for each estimator. The results were app lied to two public health data: child birth weight and cigarette smoking prevalence. Overall, go od intervals included an interval for chi-square distributions by McKay (1932), an interval esti mator for normal distributions by Miller (1991), and our proposed interval 2012-01-01T00:00:00Z http://hdl.handle.net/2099/13288 Title: Comparing and calibrating discrepancy measures for Bayesian model selection Authors: Horra, Julián de la; Rodríguez-Bernal, María Teresa Abstract: Different approaches have been considered in the literatur e for the problem of Bayesian model selection. Recently, a new method was introduced and analys ed in De la Horra (2008) by minimizing the posterior expected discrepancy between the set of data and the Bayesian model, where the chi-square discrepancy was used. In this article, several discrepancy measures are considered and compared by simulation, and it is obtained th at the chi-square discrepancy is reasonable to use. Then, an easy method for calibrating disc repancies is proposed, and the behaviour of this approach is studied on simulated data. Fin ally, a set of real data is analysed 2012-01-01T00:00:00Z http://hdl.handle.net/2099/13287 Title: Sustainability frameworks: their influence on the operational capacity of sustainability Authors: Calleros Islas, Alejandra Abstract: This paper seeks to overview some of the existing and most relevant sustainability frameworks in order to compare their approach and level of concretion towards sustainability, as well as its relation with other scientific disciplines by reviewing the considered dimensions and evaluation criteria. The aim here is actually an attempt to clarify some of the possible ways to consolidate the operational capacity of sustainability at different levels without losing its holistic approach.; El presente artículo pretende hacer una revisión de algunos de los marcos teóricos de la sostenibilidad más relevantes con el objetivo de comparar su enfoque y nivel de concreción en torno a la sostenibilidad así como su relación con otras disciplinas científicas, mediante la revisión de las dimensiones y criterios de evaluación considerados. La finalidad es en realidad un intento para determinar algunos de los posibles caminos que pueden seguirse para consolidar la capacidad operacional de la sostenibilidad a diferentes niveles sin que se pierda su perspectiva holística. 2012-12-01T00:00:00Z http://hdl.handle.net/2099/13286 Title: Presentación Authors: Aguado Chao, Juan Carlos 2012-12-01T00:00:00Z