Separación de sombras a los objetos detectados con sustracción de fondo en video

El trabajo presenta los resultados preliminares de un algoritmo de detección y eliminación de sombras, en secuencias de video. Se propone que a partir de la base de la sustracción de fondo con el algoritmo Visual Background Extraction (ViBE), que identifica zonas de movimiento, aplicar un post-procesamiento para separar los píxeles del objeto real y los de sombra. Debido a que las zonas de sombras tienen características parecidas a la de los objetos en movimiento, la separación es una tarea difícil, por lo que los algoritmos usados para esta clasificación producen gran cantidad de falsos positivos. Para atacar este problema, se parte de la premisa de utilizar información del objeto, como el tamaño y la dirección de movimiento, para estimar la posición aproximada de la sombra. Además, se realiza el análisis de las similitudes entre el cuadro actual y el modelo de fondo, con el indicador tradicional de correlación cruzada normalizada para detectar sombras. El algoritmo se puede aplicar para detectar personas o vehículos en aplicaciones para seguridad ciudadana, monitoreo de tráfico, análisis deportivo, entre otros. Los resultados obtenidos en la detección de objetos muestran que es factible recortar la sombra con alta tasa de acierto y con bajo costo computacional, lo cual también permite mejorar etapas de procesamiento posteriores, como el reconocimiento y el seguimiento de los objetos

Effectiveness of classroom management strategies in large groups 35-45 students in the national institute Guillermo Cano Balladares

This article focuses on present aspects about the effectiveness of classroom management strategies in large groups’ 35-45 students in a high school level. In this paper we explain some conceptions related to classroom management, the prescriptive strategies to be a good classroom manager and different teacher management styles. Afterwards, it describes our methodological design, the analysis, and discussions of the results gotten in this study. Finally, we propose authentic strategies and suggestions to be the best classroom manager and how to deal with large groups students

Optimización de matrices origen-destino estimadas a partir de datos georeferenciados en redes sociales

A la hora de aplicar cualquier política urbana de transporte es muy importante conocer el patrón de movilidad de la población y por lo tanto las matrices Origen Destino que la describen. Los grandes volúmenes de datos arrojados por las nuevas tecnologías permiten obtener información dinámica del comportamiento de sus usuarios. En contraposición con los métodos clásicos de obtención de las matrices O-D el uso de las redes sociales aporta una manera más económica de realizar el estudio y un mayor dinamismo. En este trabajo se desarrolla un método para la actualización de matrices Origen-Destino correspondientes a tráfico vehicular, a partir de la información obtenida de datos disponibles en la red social Twitter. Para actualizar una matriz OD anterior con nueva información se consideró un problema de maximización de entropía restringiendo la distancia a la matriz original. El enfoque presentado se aplicó a analizar la movilidad diaria de las personas de CABA obteniendo las matrices O-D que la caracterizan y los resultados obtenidos se compararon con estudios previos que se realizaron utilizando otras metodologías comprobando la viabilidad del nuevo enfoque propuesto

Urban Motion Planning Framework Based on N-Bézier Curves Considering Comfort and Safety

In last decades, great technology advances have been done related to the automotive sector, especially in Advanced Driver Assistance Systems (ADAS) developed to improve mobility in terms of comfort and safety during driving process; hence, automated driving is presented as an evolution of those systems in the present and upcoming years. The aim of this work is to present a complete framework of motion planning for automated vehicles, considering different constraints with parametric curves for lateral and longitudinal planners. Parametric Bézier curves are used as the core approach for trajectory design in intersections, roundabouts, and lane change maneuvers. Additionally, a speed planner algorithm is presented using the same parametric curve approach, considering comfort and safety. A simulation environment is used for testing the planning method in urban conditions. Finally, tests with the real platform in automated mode have been performed showing goods results.Tis work was partly supported by ECSEL Project ENABLES3 with Grant Agreement no. 692455-2 and the AutoDrive ECSEL Project with Grant Agreement no. 73746

Effectiveness of english classroom management strategies with overcrowded group in 9th grade students, at Guillermo Cano Institute during the second semester 2015

Teaching and learning English is essential in the world we live in, for this reason the need to teach and learn English language using Effectives strategies to work with overcrowded group to help the students to develop communication. This research study is about; Effectiveness of English classroom management strategies with overcrowded group with 9th grade students, at Guillermo Cano institute during the second semester 2015 The main objective of the study was to analyze the effectiveness of classroom management strategies in Teaching-learning English with overcrowded group. The total population of the research consists of 376 students and 10 teachers. Of this population a sample of 1 teacher and 37 students of 9th grades were selected

Phylogenetic relationships and genetic diversity among Orobanche cumana Wallr. and O. cernua L. (Orobanchaceae) populations in the Iberian Peninsula

Orobanche cumana is found in the Iberian Peninsula as an allochthonous species parasitizing exclusively sunflower, in contrast to the closely related species Orobanche cernua, which is an autochthonous species that only parasitizes wild Asteraceae hosts. Ten O. cumana populations were collected in the two traditional areas of sunflower broomrape occurrence, the Guadalquivir Valley, Southern Spain (six populations) and Cuenca province, Central Spain (four populations). Twelve O. cernua populations were collected on wild hosts across its natural distribution area in Southeastern Spain. Genetic relationships within and between both sets of populations were studied using a set of 50 robust and co-dominant SSR markers from O. cumana. The results supported the taxonomic separation of the two species and the existence of two distant genetic groups for O. cumana, one in Guadalquivir Valley and another one in Cuenca province. The inter- and intra-population variability was extremely low for O. cumana, whereas the overall genetic diversity was much higher for O. cernua. The genetic structure of O. cumana populations probably reflects a founder effect, with the two genetically distant groups deriving from separate introduction events. The high degree of genetic differentiation observed in O. cernua is mainly explained on the basis of restricted gene flow due to ecological barriers together with the occurrence of a predominantly self-pollinating mating system. Complementary diversity studies on both species in its current distribution area are required for understanding global genetic variability and evolutionary characteristics of the parasitism.The study was partially funded by Fundación Ramón Areces, Madrid, Spain. R. Pineda-Martos was the recipient of a Ph.D. fellowship from the Spanish National Research Council (CSIC) (JAEPre_08_00370).Peer Reviewe

Forage Yields and Structure of Moringa oleifera cv Nicaragua at Different Cutting Frequencies

The effect of the cutting frequency (45 and 60 days) on the morphological and productive behavior of Moringa oleifera Lam vc Nicaragua with irrigation and organic fertilization, on little differentiated fluvisols in Cauto Valley, in 2012. A randomized block design with four repetitions was applied. The cutting frequency affected the morphological variables (P≤ 0.001), but not DM from leaves, stems, and total yields (P≥ 0.05). The cutting times for both frequencies predisposed great variability between the first (February-March) and the third (June-July) cuts. The best plant height values were achieved in 60 days (P≤0.001), in comparison to 45 days, whereas the number and thickness of leaves per shoots varied (P≤ 0.001) at different cutting times based on innate plant features, not on the cutting frequency. Leaf proportion was higher (P≤0.001) in the 45-day frequency, and the DM yields ha-1 from leaves and DM ha-1 only differed in the first 45-day cut, in comparison to the other averages within the same cutting frequency, and the 60-day cut. The structure and productive behavior of Moringa were influenced by the cutting frequencies and times, whereas the cutting frequency alone just modified the structural variables

Herramientas para la detección y seguimiento de personas a partir de cámaras de seguridad

La inseguridad es un problema que afecta en mayor o menor medida a todas las ciudades del mundo. Las ciudades más informatizadas hacen uso de la video-vigilancia para combatirla, montando en muchos de los casos centros de monitoreo con cientos de cámaras. En su mayoría, estos centros cuentan con grupos de personas para realizar la tarea de observación, sin embargo, la velocidad de cómputo actual nos da la posibilidad de automatizar muchas de sus tareas diarias. En este trabajo, se presenta una plataforma de análisis de video que se está desarrollando en la UNCPBA para facilitar el seguimiento de una persona a través de diferentes cámaras, utilizando técnicas de proyección que convierten los puntos detectados desde las diferentes cámaras a un único espacio georeferenciado. Se presenta una discusión de los algoritmos utilizados para el seguimiento, algunos problemas propios que se suceden en este tipo de sistemas y los resultados preliminares obtenidos.XIV Workshop Computación Gráfica, Imágenes y Visualización (WCGIV)

Seismicity and structural safety in buildings: lessons learned in Mexico

Motivated by the recent seismic events in México, the seismic environment of the country is reviewed together with the mechanisms and the regions that generate earthquakes. Some of the parameters used to determine the intensity as a difference with the magnitude of earthquakes and the way to make predictions with data coming for seismological stations using attenuation functions are mentioned. It is shown how the structures that collapse after the September 19th, 2017 earthquake in México City are aligned with the transition zone between the old lake region of the Mexican valley and the hill zone. The basic criteria for structural design and how the constructions codes establish the performance level of the structures subjected to actions of different frequency and intensity, are presented. An example is given regarding the relationship that exists between strength, damage and structural performance. Some of the observed damages are presented with ideas regarding some of the aspects that can be improved that have an influence in construction safety