An application of discrete time survival models to analyze student dropouts at a private university in Peru

Discrete-time survival models are discussed and applied to the study of which factors are associated with student dropouts at a private university in Lima, Per_u. We studied the characteristics of 26; 790 incoming students enrolled between 2004 and 2012 in all the under-graduate programs at the University. The analysis include the estimation of the survival and hazard functions using the Kaplan-Meier method and the _tting of parametric models using the Cox proportional hazards regression and the Logistic regression for survival analysis, this last one, in order to include time varying variables as predictors. During the period of analysis, the cumulative probability of remain at the University after _ve years was 73.7% [95% CI: 73.1% - 74.4%]. In any period the hazard is greater than 4.4% and this highest value is reached in the 3rd semester. In a multivariate analysis, we found that academic factors (area of study, type of admission, standardized academic performance index, and the percentage of passed credits); economic factors (type of residence, and payment scale); and sociodemographic factors (mother education level, indicators of whether or not parents are alive, and the age of the student) were associated with the risk of dropout.Tesi

Learning Software Quality Assurance with Bricks

Software Quality Assurance (SQA) and Software Process Improvement (SPI) are topics of crucial importance for software engineers; however, teaching them in a lecture room comes with several limitations due to lack of practical experience. With that in mind, we created KUALI-Brick, a LEGO(R)-based activity that brings SQA and SPI concepts together applying them in order to successfully build a LEGO city. This hands-on activity has been carried out in a fourth-year Software Engineering course at the University of Canterbury, with current results showing high levels of fun, increased engagement and an improved learning experience. We present a step-by-step guide to replicate the activity as well as lessons learned after conducting the activity for three consecutive years.Comment: 9 pages, 4 figures, ICSE-JSEET 202

Effect of row orientation on soil water content and vine water status on a Cabernet franc vineyard in Madrid, spain

The aim of this study was to evaluate the effects of row orien¬tation on vine and soil water status in an irrigated vineyard. The trial was developed during 2006, 2007 and 2008, in the South East region of Madrid (Spain) on 5-year old Cabernet franc grapevines (Vitis vinifera L.) grafted onto 140Ru. Plant spacing was 2.5 m x 1.5 m and vines were trained to a VSP. Four orientations were stu¬died: North-South (N-S), East-West (E-W), Northeast-Southwest (N+45) and North-South +20o (N+20). Irrigation (0.4•ET0) started when shoot growth stopped. Soil water availability was measured using a TDR technique with forty buried probes. Row orientation did not have any effect on water consumption in the vineyard. At maturity, leaf water potential was measured at predawn, early mor¬ning, midday and 14:00 solar time, on both canopy sides - sun and shade – ; the early morning measurement was the one that better differentiated treatments. Leaf water potential was a good indica¬tor of plant water status. Differences between (N-S and E-W) and (N+20 and N+45) treatments were obtained both on sun and shade canopy sides, N+20 and N+45 having lower leaf water potentials then drier leaves. The water stress integral shows that N-S and E-W reach the end of maturation with a greater level of hydration than N+45 and N+20. As a whole, N+45 and N+20 orientations, without affecting too much the soil available water content, induce regularly more water stress to the vine at some periods, probably due to an higher sunlight interception in early morning which makes water limitation for the vine more early and thus more severe during the day

Elaboración de guías de laboratorio de estructuras de la Universidad Católica de Colombia

Práctica EmpresarialEn el presente trabajo se encontrarán las pautas y orden lógico para la realización de prácticas de laboratorio de estructuras en ingeniería civil, donde se tendrán en cuenta aspectos como funcionamiento adecuado de los equipos existentes, manejo apropiado de los materiales a ensayar y los requerimientos exigidos por las normas técnicas (ICONTEC y ASTM), para el correcto procedimiento y desarrollo en las prácticas.INTRODUCCIÓN 1. GENERALIDADES 2. METALES 3. UNIDADES DE MAMPOSTERÍA (LADRILLO) 4. LA MADERA 5. EL CONCRETO 6. CEMENTO. 7. AGREGADOS PARA CONCRETO. CONCLUSIONES RECOMENDACIONES BIBLIOGRAFÍA ANEXOPregradoIngeniero Civi

La motivación como herramienta de la dirección en el Centro Regional de Adiestramiento Canino Guayaquil en el área Antinarcóticos

This work is gathering information on the motivation of both staff police and canines of the Canine Regional Training Center "CRAC" highly specialized unit that evaluates policies and action plans against drug trafficking, basing their work on: planning, research, teaching, assessment and education. In addition to a collection of information about surveys were conducted to determine the effect of motivation for staff there are some kinds of motivations as merit, courses, trainings, appointments, commissions, grade and positive aspect; instead on the dogs: dogs with and without high, training, best breed for training and other courses. In conclusion was obtained that: motivation is a key pillar in the drive to encourage staff, should increase motivation in the unit through new strategies and policies, statistically to be considered for a higher motivation is better to have higher education; motivation in dogs causes great influence on impulses after that perform the desired activity, the most used for public safety in Ecuador race are the pastors for their physical condition and genetic, female dogs have a better predisposition for motivation and therefore are better in trainability. As we recommendations that should motivate staff having more than one year in CRAC looking mechanisms for motivation be for everyone, encouraging staff to specialize to have an advanced degree, future studies comparing with other countries in our region.El presente trabajo es la recopilación de información sobre la motivación tanto del personal policial como de los canes del Centro Regional de Adiestramiento canino “CRAC”. El CRAC es una unidad altamente especializada que evalúa políticas y planes de acción en contra del narcotráfico, basando su trabajo en: planificación, investigación, enseñanza, evaluación y educación. Además de una recopilación de información sobre el tema se realizaron encuestas para determinar el efecto de la motivación, con respecto al personal hay algunos tipos de motivaciones como: el mérito, los cursos, las capacitaciones, los nombramientos, las comisiones, el grado y el aspecto positivo; en cambio en los canes: canes con y sin alta, entrenamiento, mejor raza para entrenar y otros cursos. Como conclusiones se obtuvo que: la motivación es un pilar fundamental en la unidad para incentivar al personal. Se debería incrementar la motivación en la unidad por medio de nuevas estrategias y políticas. Estadísticamente para ser tomados en cuenta para una mayor motivación es mejor contar con estudios superiores. La motivación en los canes causa gran influencia en sus impulsos logrando que realice la actividad deseada, la raza más utilizada para la seguridad pública en el Ecuador son los pastores por su condición física y su genética, los canes hembras presentan una mejor predisposición para la motivación y por ende son mejores en la entrenabilidad. Como recomendaciones tenemos que se debería motivar al personal que tiene más de un año en el CRAC buscando mecanismos para que la motivación sea para todos, incentivar al personal a que se especialice para tener un título superior, realizar estudios futuros comparando con otros países de nuestra región

Hybrid visual servoing with hierarchical task composition for aerial manipulation

© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.In this paper a hybrid visual servoing with a hierarchical task-composition control framework is described for aerial manipulation, i.e. for the control of an aerial vehicle endowed with a robot arm. The proposed approach suitably combines into a unique hybrid-control framework the main benefits of both image-based and position-based control schemes. Moreover, the underactuation of the aerial vehicle has been explicitly taken into account in a general formulation, together with a dynamic smooth activation mechanism. Both simulation case studies and experiments are presented to demonstrate the performance of the proposed technique.Peer ReviewedPostprint (author's final draft

Sent out or sent home: understanding racial disparities across suspension types from critical race theory and quantcrit perspectives

Although in-school suspensions may be viewed as less severe than out-of-school suspensions, both discipline consequences limit students’ access to learning opportunities and are negatively associated with a range of educational outcomes. Moreover, if sending students out of class perpetuates the same racial disparities as sending them home, this practice does not realize the equity goals of discipline reforms over the last decade. Our study draws on Critical Race Theory and QuantCrit to understand racial discipline gaps across in-school and out-of-school suspensions using data from students and schools in one large district. Results of multilevel regression models indicate similar racial disparities in both suspension types, suggesting neither approach is equitable. These findings illustrate the limits of race-neutral policies in mitigating exclusionary discipline gaps. Addressing the thorny issues that contribute to racial disparities will likely require greater resources for high quality implementation of school-wide culture change initiatives that are explicitly anti-racist