A Linguistic Recommender System For University Digital Libraries To Help Users In Their Research Resources Accesses

The Web is one of the most important information media and it is influencing in the development of other media, as for example, newspapers, journals, books, libraries, etc. Moreover, in recent days people want to communicate and collaborate. So, libraries must develop services for connecting people together in information environments. Then, the library staff needs automatic techniques to facilitate that a great number of users can access to a great number of resources. Recommender systems are tools whose objective is to evaluate and filter the great amount of information available on the Web. We present a model of a fuzzy linguistic recommender system to help University Digital Library users in their research resources accesses. This system recommends researchers specialized and complementary resources in order to discover collaboration possibilities to form multi-disciplinaryy groups. In this way, this system increases social collaboration possibilities in a university framework and contributes to improve the services provided by a University Digital Library

Constraining the Distribution of L- & T-Dwarfs in the Galaxy

We estimate the thin disk scale height of the Galactic population of L- & T-dwarfs based on star counts from 15 deep parallel fields from the Hubble Space Telescope. From these observations, we have identified 28 candidate L- & T- dwarfs based on their (i'-z') color and morphology. By comparing these star counts to a simple Galactic model, we estimate the scale height to be 350+-50 pc that is consistent with the increase in vertical scale with decreasing stellar mass and is independent of reddening, color-magnitude limits, and other Galactic parameters. With this refined measure, we predict that less than 10^9 M_{sol} of the Milky Way can be in the form L- & T- dwarfs, and confirm that high-latitude, z~6 galaxy surveys which use the i'-band dropout technique are 97-100% free of L- & T- dwarf interlopers.Comment: 4 pages, 4 figures, accepted to ApJ

Farmers’ management of functional biodiversity goes beyond pest management in organic European apple orchards

Supporting functional biodiversity (FB), which provides natural pest regulation, is an environmentally sound and promising approach to reduce pesticide use in perennial cultures such as apple, especially in organic farming. However, little is known about farmers’ practices and motivations to implement techniques that favor FB, especially whether or not they really expect anything from FB in terms of pest regulation. In fact, FB-supporting techniques (FB-techniques) are massively questioned by practitioners due to inadequate information about their effectiveness. An interview survey was performed in eight European countries(i) to describe farmers’ practices and identify promising FB-techniques: (ii) to better understand their perceptions of and values associated with FB; and (iii) to identify potential drivers of (non-)adoption. Fifty-five advisors and 125 orchard managers with various degrees of experience and convictions about FB were interviewed and a total of 24 different FB-techniques which can be assigned to three different categories (ecological infrastructures, farming practices and redesign techniques) were described. Some were well-established measures (e.g., hedges and bird houses), while others were more marginal and more recent (e.g., animal introduction and compost). On average, farmers combined more than four techniques that had been implemented over a period of 13 years, especially during their establishment or conversion period. In general, it was difficult for farmers to evaluate the effectiveness of individual FB-techniques on pest regulation. They considered FB-techniques as a whole, targeting multiple species, and valued multiple ecosystem services in addition to pest regulation. The techniques implemented and their associated values differed among farmers who adopted various approaches towards FB. Three different approaches were defined: passive, active and integrated. Their appraisal of FB is even more complex because it may change with time and experience. These findings provide empirical evidence that the practical implementation of promising techniques remains a challenge, considering the diversity of situations and evaluation criteria. Increased cooperation between researchers, farmers and advisors should more effectively target research, advisory support and communication to meet farmers’ needs and perceptions

Análisis de datos composicionales para el monitoreo del desempeño de estudiantes de una carrera universitaria de grado. El caso de Ingeniería en Agrimensura de la Universidad Nacional del Nordeste

En este trabajo se describe el desempeño de los estudiantes que cursaron las asignaturas del plan de estudios de la carrera de Ingeniería en Agrimensura, de la Facultad de ciencias exactas y naturales y Agrimensura de la universidad Nacional del Nordeste (FAcenA-unne), en el periodo 2011-2014. La información del resultado del cursado de dichas asignaturas, se analizó mediante la técnica de datos composicionales. Se observó que las mayores deficiencias en el rendimiento académico se presentan en las asignaturas de ciencias básicas, en las cuales los porcentajes de regularización no superan el 50%. esta situación se registra fuertemente en las asignaturas de primer año del primer cuatrimestre, siendo elevado el porcentaje de alumnos libres por asistencia. esta información permitirá apoyar el proceso de monitoreo de la implementación del plan de estudios, actividad comprometida en el proceso de acreditación de la carrera.

Análisis estadístico implicativo de los conocimientos previos sobre propiedades de operaciones con números reales de ingresantes a carreras de ingeniería de FACENA

Este trabajo tiene por objetivo presentar un método de Estadística multivariada llamado Análisis Estadístico Implicativo (ASI) que permite determinar los conocimientos de los estudiantes (materializados en sus respuestas a distintos ítems de evaluación) así como las relaciones conceptuales que entre ellos establecen los sujetos evaluados. ASI, a diferencia de los métodos clásicos de asociación de variables, permite detectar relaciones del tipo “si p, entonces, casi siempre q”, a las cuales se las denomina cuasi-implicaciones o reglas. Estas relaciones se presentan mediante un “grafo implicativo” que permite la mejor interpretación de las relaciones mencionadas. Para lograr el objetivo propuesto en este artículo, se utilizó ASI para analizar un ítem de evaluación de una prueba de diagnóstico suministrada a ingresantes a Ingeniería Eléctrica, Ingeniería en Agrimensura e Ingeniería en Electrónica al inicio del año lectivo 2017 y se realizó una comparación entre las relaciones detectadas según los alumnos pertenezcan a una u otra carrera. A modo general, se observaron saberes y relaciones conceptuales establecidos por los alumnos que dan cuenta de su escasa evolución del pensamiento aritmético al algebraico, independientemente de la carrera a la que pertenecen

Building an end user focused THz based ultra high bandwidth wireless access network: The TERAPOD approach

The TERAPOD project aims to investigate and demonstrate the feasibility of ultra high bandwidth wireless access networks operating in the Terahertz (THz) band. The proposed TERAPOD THz communication system will be developed, driven by end user usage scenario requirements and will be demonstrated within a first adopter operational setting of a Data Centre. In this article, we define the full communications stack approach that will be taken in TERAPOD, highlighting the specific challenges and aimed innovations that are targeted