Interactive Data Exploration with Smart Drill-Down

We present {\em smart drill-down}, an operator for interactively exploring a relational table to discover and summarize "interesting" groups of tuples. Each group of tuples is described by a {\em rule}. For instance, the rule $(a, b, \star, 1000)$ tells us that there are a thousand tuples with value $a$ in the first column and $b$ in the second column (and any value in the third column). Smart drill-down presents an analyst with a list of rules that together describe interesting aspects of the table. The analyst can tailor the definition of interesting, and can interactively apply smart drill-down on an existing rule to explore that part of the table. We demonstrate that the underlying optimization problems are {\sc NP-Hard}, and describe an algorithm for finding the approximately optimal list of rules to display when the user uses a smart drill-down, and a dynamic sampling scheme for efficiently interacting with large tables. Finally, we perform experiments on real datasets on our experimental prototype to demonstrate the usefulness of smart drill-down and study the performance of our algorithms

Teacher development program on teaching listening using virtual resources at a public school.

Tesis de investigación, que los autores llevaron a cabo un Desarrollo Profesional del Profesorado en una escuela pública de Bogotá (Institución Educativa Distrital de La Floresta sur), tener en cuenta la importancia de la formación de maestros competentes, en el uso de recursos virtuales en Colombia, que mintió en la necesidad de añadir a los procesos pedagógicos, estrategias que conduzcan maestros para alcanzar las metas propuestas en el plan de estudios. Se mintió también en el análisis pedagógica llevada a cabo por los profesores, éstos tienen que ser competentes no sólo en el conocimiento de los recursos virtuales, sino también para llevar a cabo los análisis reflexivos en la adecuación de la enseñanza Escuchar estrategias aplicadas en el aula, ya que podrían dar lugar a resultados inesperados o fallas en el proceso de enseñanza-aprendizaje de Inglés. El proyecto se llevó a cabo en diferentes etapas para lograr cada uno de los objetivos. Fue necesario establecer las siguientes tres tareas científicas, que determinan la realización de la obra. En primer lugar, la identificación de la teoría sobre el desarrollo de los profesores, profesores de inglés el conocimiento pedagógico y recursos virtuales, el panorama general de los profesores desarrollo profesional TIC en Colombia y escuchando estrategias de cualificaciones como una guía para el diseño de este programa de profesores. Entonces, el diseño y la implementación de un programa de recursos virtuales para profesores de inglés, a fin de prepararlos para integrar los recursos virtuales de manera efectiva a través del plan de estudios, en función del idioma Inglés y la metodología de enseñanza, y, finalmente, la evaluación de cómo la aplicación de un programa de recursos virtuales de inglés como lengua extranjera profesores de enseñanza impactos del Inglés y el proceso de aprendizaje. Se aplicó el programa de desarrollo del Profesorado durante siete (7) sesiones, en las que los planes de estudio correspondientes fueron diseñados con una base teórica profunda, objetivos, recursos virtuales y las estrategias de enseñanza de escucha para ser aplicadas por los alumnos. Durante las sesiones, los participantes fueron expuestos a llenar un diario y participar en un foro con el fin de recopilar la información pertinente a través de la investigación que dieron resultados, además, un profesor externo se observan las sesiones, la evaluación de los investigadores. Los resultados fueron analizados por la estrategia de triangulación, que ayudó a interpretar la información acerca de cómo los maestros sintieron en el TPD, cómo se apoya en sus propias experiencias de enseñanza de inglés y cómo utilizar la DPT se podría mejorar en futuros proyectos y los cambios que pueda tener. Hay que reconocer que esta investigación, cuya importancia ha sido reconocida, formando maestros para utilizar los recursos virtuales para proponer actividades de aprendizaje para capacitar en la habilidad comunicativa (escuchar), y proporcionar actividades de vocabulario para las áreas tecnológicas (entre otros). También proporcionó estrategias docentes para utilizar la tecnología en su proceso de enseñanza-aprendizaje. La adición de la importancia de utilizar los recursos virtuales, es relevante mencionar que hace más fácil la enseñanza de actividades, que tiene una ubicación central accesible desde cualquier lugar, con un enorme despliegue de herramientas para ayudar a la entrega, el marcado y proporcionar retroalimentación para todos los cursos. Además, la necesidad de establecer un programa de formación del profesorado, también mintió en la necesidad de llevar a cabo una solución inmediata a la falta de programas de formación en esta área específica, en la que la tecnología se evidencia en los cambios estructurales fundamentales que era parte integral de lograr mejoras significativas, usarlo para infundir aulas con herramientas digitales para el aprendizaje, apoyando el aprendizaje de las 24 horas del día, 7 días a la semana, aumentando el compromiso y la motivación de los maestros.Research thesis, which the authors carried out a Teachers´ Professional Development in a public school in Bogotá (Institución educativa distrital la Floresta sur), take into account the importance of forming competent teachers, in the use of Virtual Resources in Colombia, which lied in the necessity of adding to the pedagogical process, strategies that lead teachers to achieve the goals proposed in the curriculum. It also lied in the pedagogical analysis carried out by teachers, these need to be competent not only in the knowledge of Virtual Resources, but also to carry out reflexive analyses in the adequacy of Teaching Listening Strategies applied in the classroom, since they could lead to unexpected results or failures in the English teaching-learning process. The project was carried out in different stages to accomplish each one of the objectives. It was necessary to establish the following three scientific tasks, which determined the fulfillment of the work. Firstly, the identification of the theory about teachers‘ development, English Teachers Pedagogical Knowledge and virtual resources, the general panorama of teachers' ICT professional development in Colombia and listening skills strategies as a guide to design the teachers’ program. Then, the design and implementation of a Virtual Resources program for EFL teachers, to prepare them to integrate virtual resources effectively across the curriculum, based on English language and teaching methodology, and finally the evaluation of how the implementation of a virtual resources program for EFL teachers impacts the English teaching and learning process. The teachers´ development program was applied during seven (7) sessions, in which the corresponding lesson plans were designed with a deep theoretical foundation, objectives, virtual resources and teaching listening strategies to be applied by the trainees. During the sessions, the trainees were exposed to fill a diary and to participate in a forum in order to collect relevant information that through the research gave results, besides, an external teacher was observing the sessions, evaluating the researchers. The results were analyzed by the triangulation strategy, which helped to interpret the information about how the teachers felt in the TPD, how it supported in their own English teaching experiences and how the TPD could be enhanced in future projects and the changes it may have. It must be recognized that this research, which importance has been recognized, forming teachers to use virtual resources to propose learning activities to provide training in the communicative skill (listening), and to provide vocabulary activities for the technological areas (among others). It also provided teachers strategies to use technology in their teaching-learning process. Adding the importance of using virtual resources, it is relevant to mention that it made teaching activities easier, having one central location accessible anywhere, with a massive array of tools for aiding the delivery, marking and providing feedback for all courses. Besides, the need of establishing a teacher formation program, also lied in the need of carrying out an immediate solution to the lack of formation programs in this specific area, in which technology is evidenced in fundamental structural changes that was integral to achieve significant improvements, using it to infuse classrooms with digital learning tools, supporting learning 24 hours a day, 7 days a week, increasing teachers engagement and motivation

Comprehensive and Reliable Crowd Assessment Algorithms

Evaluating workers is a critical aspect of any crowdsourcing system. In this paper, we devise techniques for evaluating workers by finding confidence intervals on their error rates. Unlike prior work, we focus on "conciseness"---that is, giving as tight a confidence interval as possible. Conciseness is of utmost importance because it allows us to be sure that we have the best guarantee possible on worker error rate. Also unlike prior work, we provide techniques that work under very general scenarios, such as when not all workers have attempted every task (a fairly common scenario in practice), when tasks have non-boolean responses, and when workers have different biases for positive and negative tasks. We demonstrate conciseness as well as accuracy of our confidence intervals by testing them on a variety of conditions and multiple real-world datasets.Comment: ICDE 201

Novel studies about the electrooxidation of a deoxinivalenol (don) mycotoxin reduction product adsorbed on glassy carbon and carbon paste electrodes

A novel and fast square-wave adsorptive anodic stripping voltammetric procedure on glassy carbon and carbon paste electrodes is described for the indirect trace quantitation of deoxynivalenol (DON) mycotoxin that frequently contaminates soya and foodstuff. The ?in situ? homogeneous reduction of the toxin by product/s of dissolved oxygen electroreduction in pH 8 buffer solution makes the quantitation of DON possible through a simple electroanalytical technique. Moreover, its potential use for the analysis of real samples was demonstrated using a soya flour sample spiked with DON without previous separating procedures. The DON detection limits were 3.6 and about 6 ppb from standard solutions and soya flour matrix, respectively.Fil: Molina, Patricia Gabriela. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Zon, María Alicia. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Fernandez, Hector. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentin

Consistency in a Partitioned Network: A Survey

Recently, several strategies for transaction processing in partitioned distributed database systems with replicated data have been proposed. We survey these strategies in light of the competing goals of maintaining correctness and achieving high availability. Extensions and combinations are then discussed, and guidelines for the selection of a strategy for a particular application are presented

Development of a highly sensitive noncompetitive electrochemical immunosensor for the detection of atrazine by phage anti-immunocomplex assay

The development of immunosensors for the detection of small molecules is of great interest because of their simplicity, high sensitivity and extended analytical range. Due to their size, small compounds cannot be simultaneously recognized by two antibodies impeding their detection by noncompetitive two-site immunoassays, which are superior to competitive ones in terms of sensitivity, kinetics, and working range. In this work, we combine the advantages of magneto-electrochemical immunosensors with the improved sensitivity and direct proportional signal of noncompetitive immunoassays to develop a new Phage Anti-Immunocomplex Electrochemical Immunosensor (PhAIEI) for the detection of the herbicide atrazine. The noncompetitive assay is based on the use of recombinant M13 phage particles bearing a peptide that specifically recognizes the immunocomplex of atrazine with an anti-atrazine monoclonal antibody. The PhAIEI performed with a limit of detection (LOD) of 0.2 pg mL−1, which is 200-fold better than the LOD obtained using the same antibody in an optimized conventional competitive ELISA, with a large increase in working range. The developed PhAIEI was successfully used to assay undiluted river water samples with no pretreatment and excellent recoveries. Apart from the first demonstration of the benefits of integrating phage anti-immunocomplex particles into electrochemical immunosensors, the extremely low and environmentally relevant detection limits of atrazine attained with the PhAIEIS may have direct applicability to fast and sensitive detection of this herbicide in the environment.Fil: González Techera, Andrés. Universidad de la República; UruguayFil: Zon, María Alicia. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquímicas y Naturales. Departamento de Química. Area Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Molina, Patricia Gabriela. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquímicas y Naturales. Departamento de Química. Area Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fernandez, Hector. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquímicas y Naturales. Departamento de Química. Area Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: González Sapienza, Gualberto. Universidad de la República; UruguayFil: Arevalo, Fernando Javier. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquímicas y Naturales. Departamento de Química. Area Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin