Distributed Correlation-Based Feature Selection in Spark

CFS (Correlation-Based Feature Selection) is an FS algorithm that has been successfully applied to classification problems in many domains. We describe Distributed CFS (DiCFS) as a completely redesigned, scalable, parallel and distributed version of the CFS algorithm, capable of dealing with the large volumes of data typical of big data applications. Two versions of the algorithm were implemented and compared using the Apache Spark cluster computing model, currently gaining popularity due to its much faster processing times than Hadoop's MapReduce model. We tested our algorithms on four publicly available datasets, each consisting of a large number of instances and two also consisting of a large number of features. The results show that our algorithms were superior in terms of both time-efficiency and scalability. In leveraging a computer cluster, they were able to handle larger datasets than the non-distributed WEKA version while maintaining the quality of the results, i.e., exactly the same features were returned by our algorithms when compared to the original algorithm available in WEKA.Comment: 25 pages, 5 figure

The Research Object Suite of Ontologies: Sharing and Exchanging Research Data and Methods on the Open Web

Research in life sciences is increasingly being conducted in a digital and online environment. In particular, life scientists have been pioneers in embracing new computational tools to conduct their investigations. To support the sharing of digital objects produced during such research investigations, we have witnessed in the last few years the emergence of specialized repositories, e.g., DataVerse and FigShare. Such repositories provide users with the means to share and publish datasets that were used or generated in research investigations. While these repositories have proven their usefulness, interpreting and reusing evidence for most research results is a challenging task. Additional contextual descriptions are needed to understand how those results were generated and/or the circumstances under which they were concluded. Because of this, scientists are calling for models that go beyond the publication of datasets to systematically capture the life cycle of scientific investigations and provide a single entry point to access the information about the hypothesis investigated, the datasets used, the experiments carried out, the results of the experiments, the people involved in the research, etc. In this paper we present the Research Object (RO) suite of ontologies, which provide a structured container to encapsulate research data and methods along with essential metadata descriptions. Research Objects are portable units that enable the sharing, preservation, interpretation and reuse of research investigation results. The ontologies we present have been designed in the light of requirements that we gathered from life scientists. They have been built upon existing popular vocabularies to facilitate interoperability. Furthermore, we have developed tools to support the creation and sharing of Research Objects, thereby promoting and facilitating their adoption.Comment: 20 page

Microwave plasma and rapid thermal processing of indium-tin oxide thin films for enhancing their performance as transparent electrodes

Rehab Ramadan, Kamal Abdel-Hady, Miguel Manso-Silván, Vicente Torres-Costa, and Raúl J. J. Martín-Palma "Microwave plasma and rapid thermal processing of indium-tin oxide thin films for enhancing their performance as transparent electrodes," Journal of Photonics for Energy 9(3), 034001 (27 August 2019). https://doi.org/10.1117/1.JPE.9.034001Indium-tin oxide (ITO) is widely used as a transparent electrode for optoelectronic devices given its large transparency and high conductivity. However, the particular properties of this material greatly depend on the overall fabrication process. We report on the effect of four different postfabrication processes on ITO thin films grown by electron beam evaporation. More specifically, the effect on the overall properties of the evaporated ITO thin films of microwave plasma annealing, rapid thermal processing, and the two processes combined were analyzed. In particular, the morphological, chemical, optical, and electrical properties of the annealed ITO thin films were studied. The experimental results show that the ITO thin films can be turned from opaque to transparent, and their conductivity can be improved by one order of magnitude depending on the particular postfabrication proces

Indicios de homeschooling parental en comunidades vulnerables regionales: análisis de documentales al bicentenario

El homeschooling se ha configurado como una alternativa educativa para los padres de familia, con mayor frecuencia, en los últimos años. Lo que generó que sea un tema de estudio inminente. Por ello, ante la existencia de registros documentales en los medios de comunicación masiva, se realizó por primera vez la investigación de indicios de homeschooling en los contextos de las comunidades regionales vulnerables del Perú. Se analizaron e interpretaron los indicios de homeschooling parental practicados en las comunidades vulnerables regionales en el Perú en los últimos cinco años, desde una investigación básica de enfoque cualitativo, diseño interpretativo. Se utilizó una ficha de análisis de registros documentales que permitió codificar los rasgos y registrar las características de diez reportajes, de los cuales ocho cumplieron con todos los parámetros establecidos. Estos generaron nuevas categorías emergentes relacionadas con la categoría y las subcategorías planteadas a priori (motivaciones, ideólogos y pedagogos). Entre ellas, se obtuvieron el desarrollo e integración sociocultural hallado en los ideólogos y convivencia para la permanencia escolar en los pedagogos. Se descubrió que en el Perú existió diferencia entre grupos de padres, los ideólogos tienen como objetivo brindar a los estudiantes una educación basada en las creencias religiosas y los valores, mientras que los padres pedagogos tienen como objetivo brindar una educación basada en las relaciones sociales, orientado al éxito académico

Control de tesorería y su relación con la liquidez de las empresas de químicos alimenticios, Cercado de Lima, periodo 2020

El presente trabajo de investigación tiene como objetivo general, determinar la relación que existe entre el Control de tesorería y la liquidez de las empresas de químicos alimenticios para el periodo 2020. Es importante que toda empresa controle sus flujos de efectivo con mucha diligencia y cautela para salvaguardar la capacidad económica que le permitirá mantenerse en operatividad, de esta manera el área de tesorería cumple un papel muy importante en el manejo del efectivo, siendo este el responsable de la aplicación de diversos controles y procedimientos que ayudaran a mitigar los riesgos de que la empresa no cuente con la liquidez necesaria. La investigación trabajada es de metodología tipo básica, de diseño no experimental y de nivel correlacional, donde las variables fueron relacionadas entre sí mediante métodos cuantitativos, la muestra de estudio estuvo conformada por 40 trabajadores, cuyos datos fueron recogidos a través del instrumento cuestionario electrónico empleada bajo la escala de Likert y previamente validada por 3 expertos profesionales. Para el análisis de los datos recolectados, se utilizó el programa estadístico SPSS v.26, en donde la prueba Alfa de Cronbach resultó en 0.910 demostrando así la confiabilidad del estudio, así mismo para verificar la relación entre las dos variables, se ejecutó la prueba estadística de Rho Spearman (0.796) que determina la aceptación de la hipótesis alterna, por tanto, se concluye que el control de tesorería se relaciona significativamente con la liquidez