Color image quantization using the shuffled-frog leaping algorithm

[EN] Swarm-based algorithms define a family of methods that consider a population of very simple individuals that cooperate to solve a difficult problem. The Shuffled frog-leaping algorithm is a method of this type that has been applied to solve different types of problems. This article describes the application of this algorithm to the color quantization problem. Although the selected method was developed to solve optimization problems, this work shows how it can be adapted to solve the problem proposed. The proposed method uses the mean squared error as the objective function of the optimization problem to be solved. To reduce the execution time of the algorithm, it is applied to a subset of pixels of the original image. As a result, a quantized palette is obtained that is used to define the quantized image. Computational results indicate that the proposed method can generate a quantized image with low computational cost. Moreover, the quality of the image generated is better than that of the images obtained by several well-known color quantization methods

Desarrollo de una herramienta para el aprendizaje autónomo del alumno en la asignatura fundamentos de programación

Memoria ID-022. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2013-2014

Integracion del grado en Ingenieria Informatica en Sistemas de Informacion en las redes sociales

Memoria ID11-223. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2011-2012

Diseño de un animador de algoritmos de búsqueda y ordenación

Memoria ID12-0055. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2012-2013

Creación de un curso cero para los estudiantes de programación

Memoria ID-0269. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2015-2016

Cuestionarios de auto-evaluación como herramienta de apoyo para el aprendizaje autónomo del alumno

Memoria ID-0135. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2014-2015

Pasemos REVISTA. Publicaciones Periódicas

De un modo gráfico, se explica la gestión de Publicaciones Periódicas en Koha, el procedimiento de trabajo desde la adquisición hasta el registro de ejemplares, la visualización en OPAC desde el punto de vista del usuario y la conservación de los fondos en las distintas ubicaciones

The crucial role of molecular emissions on LIBS differentiation of organic compounds of interest in astrobiology under a Mars simulated atmosphere

In this work, the influence of Martian atmosphere on the recombination mechanisms in laser-induced plasmas of organic compounds of interest in astrobiology has been closely examined. The proposed LIBS methodology reveals new insights concerning the influence of the surrounding atmosphere on the molecular emission of organics. The presence of nitrogen, even in the short concentration found in the low-pressure Mars environment, influences the plasma chemistry and the formation pathways leading to molecular species. Characteristic atomic and molecular emitters (C, H, C2, CN, NH, OH and CH) were inspected in a set of selected organic compounds considered as meaningful biomarkers. For comparative purposes, LIBS analysis was performed in both low-pressure air and Martian atmospheres. Statistical analysis (linear discriminant analysis; DFA) suggested that satisfactory differentiation among materials was feasible under Martian conditions when molecular emissions are computed in the classification algorithm. Atomic lines (C, H) only contribute a mere ~62% to the discriminating analysis, whereas the percentage of successful discrimination was considerably increased (up to 99%) by the progressive introduction of signals associated to molecular bands into the DFA analysis, thus confirming the major contribution of molecular information to the final sorting performance and the feasibility of discriminating closely related organic compounds by LIBS in the Martian atmosphere.his work was partially supported by Programa Operativo FEDER Andalucía 2014–2020, Consejería de Economía y Conocimiento de la Junta de Andalucía, Reference UMA18-FEDERJA-272 and by Project PID2020-119185GB-I00 from Ministerio de Ciencia e Innovación, Spain. The authors would also like to acknowledge the support of the SIGUE-Mars Research Network, the International Space Science Institute (ISSI) Bern and the International Space Science Institute (ISSI) Beijing. // Funding for open access charge: Universidad de Málaga / CBU

The stellar content of giant H II regions in NGC 7714

This is an electronic version of an article published in The Astrophysical Journal. García-Vargas, M.L., González-Delgado, R.M., Pérez, E., Alloin, D., Díaz, A. and E. Terlevich. The stellar content of giant H II regions in NGC 7714. The Astrophysical Journal 478 (1997): 112-12

Social services for the elderly: a multivariate perspective study

IntroductionToday’s society is aware that healthy aging favors quality of life in the future, even more so as life expectancy increases in populations such as Europe. As in countries such as Japan, it is necessary for institutions to provide social services to support the elderly, with the aim of achieving an optimal quality of life for these people. The aim of this study is to analyze the different types of social services and activities that certain institutions provide to the elderly in order to find areas for improvement or to propose relationships between them that will benefit both users and institutions.MethodsOfficial data from Junta de Castilla y León (Spain) on social services for the elderly in the 9 provinces of the autonomous community of Castilla y León from 2007 to 2021 were analysed using multivariate statistical techniques.ResultsThroughout the period under analysis, there is an association between the number of places in public and private non-profit residential centers for the elderly and the number of places in day-care centers or the number of students in the Inter-University Experience Programme. The variables associated with the telecare programme are related to the number of people under guardianship. On the other hand, three well-differentiated clusters of provinces of Castilla y León were observed.DiscussionOur findings have implications for the quality of life of the elderly, as the differences in social services in the areas analysed have a direct impact on the health of the elderly