26 research outputs found

    Flexible statistical construction of bilingual dictionaries

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    La mayoría de los sistemas previos para construir un diccionario bilingüe a partir de un corpus paralelo dependen de un algoritmo iterativo, usando probabilidades de traducción de palabras para alinear palabras en el corpus y sus alineamientos para estimar probabilidades de traducción, repitiendo hasta la convergencia. Si bien este enfoque produce resultados razonables, es computacionalmente lento, limitando el tamaño del corpus que se puede analizar y el del diccionario producido. Nosotros proponemos una aproximación no iterativa para producir un diccionario bilingüe unidireccional que, si bien menos precisa que las aproximaciones iterativas, es mucho más rápida, permitiendo procesar córpora mayores en un tiempo razonable. Asimismo, permite una estimación en tiempo real de la probabilidad de traducción de un par de términos, lo que significa que permite obtener un diccionario de traducción con los n términos más frecuentes, y calcular las probabilidades de traducción de términos infrecuentes cuando se encuentren en documentos reales.Most previous systems for constructing a bilingual dictionary from a parallel corpus have depended on an iterative algorithm, using word translation probabilities to align words in the corpus, and using word alignments to estimate word translation probabilities, and repeating until convergence. While this approach produces reasonable results, it is computationally slow, limiting the size of the corpus that can be analysed and the size of the dictionary produced. We propose a non-iterative approach for producing a uni-directional bilingual dictionary which, while less accurate than iterative approaches, is far quicker, allowing larger corpora to be processed in reasonable time. The approach also allows on-the-fly estimation of translation likelihoods between a pair of terms, meaning that a translation dictionary can be generated with the n most frequent terms in an initial pass, and the translation likelihood of infrequent terms can be calculated as encountered in real documents

    Adapting an educational tool to be used by non-severe cognitive disabled students

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    Also published online by CEUR Workshop Proceedings (CEUR-WS.org, ISSN 1613-0073)Proceeding of Towards User Modeling and Adaptive Systems for All (TUMAS-A 2009): Modeling and Evaluation of Accessible Intelligent Learning Systems, In conjunction with the 14th International Conference on Artificial Intelligence in Education (AIED 2009) Brighton, United Kingdom, July 6, 2009.Since 2007, we have been using the Will Tools, a set of Blended Learning applications able to automatically assess students’ free-text answers and provide immediate personalized feedback to each student. In this paper, our hypothesis is that these tools can be easily adapted to be used by students with some type of non-severe cognitive impairment. In order to test this hypothesis, we present a procedure to transform the Will Tools into the Will Tools ALADE (the version of the Will Tools designed for students with cognitive disabilities). Moreover, an experiment in which 13 students, some of them with Down syndrome and others type of non-severe mental disabilities, have successfully used the Will Tools ALADE is describedThis work has been sponsored by Spanish Ministry of Science and Technology, project TIN2007-64718

    Using automatically generated students' clickable conceptual models for e-tutoring

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    Supplementary Proceedings of the 16th International Conference on Conceptual Structures (ICCS'08). Toulouse, France, July 7-11, 2008.Also published online by CEUR Workshop Proceedings (CEUR-WS.org, ISSN 1613-0073)Computer methods for evaluating student's knowledge have traditionally been based on Multiple Choice Questions (MCQs) or llin- the-blank exercises, which do not provide a reliable basis upon which to assess student's underlying misconceptions. Because of this lack, we have devised and implemented a procedure for automatically deriving clickable students' conceptual models from their free-text answers. A student's conceptual model can be de ned as a network of interrelated concepts associated with a con dence value that indicates how well each student knows a concept. Several knowledge representation formats are used to show the generated conceptual model to the student. Furthermore, students can click on the concepts to get more information about them. 22 English Studies students are taking advantage of this new resource to review their Pragmatics course. Initial results show that they have found it very useful and claim that it is a good support for their review of the subject.This work has been sponsored by Spanish Ministry of Science and Technology, project number TIN2007-64718

    Automatic identification of terms for the generation of students’ concept maps

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    Proceedings of the 4th International Conference on Multimedia and Information and Communication Technologies in Education, M-icte 2006, held in Seville (Spain) on November 2006Willow, an adaptive multilingual free-text Computer-Assisted Assessment system, automatically evaluates students’ free-text answers given a set of correct ones. This paper presents an extension of the system in order to generate the students’ concept maps while they are being assessed. To that aim, a new module for the automatic identification of the terms of a particular knowledge field has been created. It identifies and keeps track of the terms that are being used in the students’ answers, and calculates a confidence score of the student's knowledge about each term. An empyrical evaluation using the students' real answers show that it is robust enough to generate a good set of terms from a very small set of answers.This work has been sponsored by Spanish Ministry of Science and Technology, project number TIN2004-0314

    The Genotype of the Donor for the (GT)n Polymorphism in the Promoter/Enhancer of FOXP3 Is Associated with the Development of Severe Acute GVHD but Does Not Affect the GVL Effect after Myeloablative HLA-Identical Allogeneic Stem Cell Transplantation

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    The FOXP3 gene encodes for a protein (Foxp3) involved in the development and functional activity of regulatory T cells (CD4+/CD25+/Foxp3+), which exert regulatory and suppressive roles over the immune system. After allogeneic stem cell transplantation, regulatory T cells are known to mitigate graft versus host disease while probably maintaining a graft versus leukemia effect. Short alleles (≤(GT)15) for the (GT)n polymorphism in the promoter/enhancer of FOXP3 are associated with a higher expression of FOXP3, and hypothetically with an increase of regulatory T cell activity. This polymorphism has been related to the development of auto- or alloimmune conditions including type 1 diabetes or graft rejection in renal transplant recipients. However, its impact in the allo-transplant setting has not been analyzed. In the present study, which includes 252 myeloablative HLA-identical allo-transplants, multivariate analysis revealed a lower incidence of grade III-IV acute graft versus host disease (GVHD) in patients transplanted from donors harboring short alleles (OR = 0.26, CI 0.08-0.82, p = 0.021); without affecting chronic GVHD or graft versus leukemia effect, since cumulative incidence of relapse, event free survival and overall survival rates are similar in both groups of patients

    Llibre Blanc de la mediació a Catalunya

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    Projectes científics associats: IDT SGR2009-688; ONTOMEDIA CSO-2008-05536-SOCI, TSI-20501-2008-131; GCC SGR2009-221; GREL SGR2009-357; SGR2009-1328; AT CSD2007-0022; AT COST IC0801Altres ajuts: TSI-20501-2008-131Altres ajuts: COST-IC0801L'estudi que es presenta ara és fruit de gairebé dos anys de treball. Una cartografia completa de les experiències en mediació en tots els àmbits socials, de les escoles als hospitals, de les empreses als nuclis familiars, de la mediació comunitària als conflictes de consum o laborals, de la mediació penal a la mediambiental. També s'hi ha incorporat una anàlisi dels costos de la mediació i de la seva configuració jurídica. La conjunció de les fotografies en relleu i dels estudis més teòrics han fet possible la reflexió ulterior, les interpretacions crítiques i, en darrer terme, les conclusions i les recomanacions, que ens ajudaran a progressar. La mediació permet detenir l'escalada dels conflictes i sostreure'ls de la resolució judicial, per implicar les parts i fer-les protagonistes actives de les solucions a què arribin. Des del Departament de Justícia, ens interessa superar l'excessiva judicialització dels conflictes -insatisfactòria per a tothom- i promoure instruments que facilitin, de manera àgil però amb totes les garanties, la intel·ligència dels problemes i, a partir d'aquí, la fixació de les millors solucions per a les parts implicades, que elles mateixes hauran construït

    Una metodología para gestión de la interacción entre los estudiantes, los profesores y el contenido en aplicaciones en línea de aprendizaje hibrido usando modelos conceptuales

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    El interés principal de este trabajo se encuentra en la interacción de sistemas informáticos en línea para soporte del aprendizaje de un curso. Este tipo de sistemas combinan la educación tradicional con las nuevas tecnologías. Los sistemas que se analizan en esta investigación son usados, por una parte, por los docentes; y por otra, por los estudiantes. En este trabajo se propone una nueva metodología de gestión de la interacción basada en principios IPO y adaptada para sistemas de Aprendizaje Híbrido. La metodología desarrollada es M-I2P5, puesto que trata dos tipos de interacción: la interacción entre el estudiante y la capa computacional (o sistema informático educacional); y la interacción entre el profesor y dicha capa computacional. Proporciona cinco procesos: tres de ellos para modelar la interacción estudiante-capa computacional y dos para la interacción profesor-capa computacional. La metodología, M-I2P5 se basa en el uso de modelos conceptuales como elemento clave del modelo de datos. Este modelo de datos sirve para capturar los conceptos, y las relaciones entre ellos, de distintos contenidos educativos. M-I2P5 se ha implementado en el conjunto de herramientas de Aprendizaje Híbrido llamado Will Tools. Se han realizado varios experimentos con profesores y estudiantes para comprobar su grado de satisfacción y la frecuencia de uso de estas herramientas con la metodología M-I2P5 implementada respecto a versiones previas de las Will Tools sin la metodología implementada, obteniéndose resultados positivos tanto en el aumento de uso de las herramientas, como en el nivel de satisfacción percibido por los profesores y los estudiantes.MadridUniversidad Autónoma Madrid. Escuela Politécnica Superior. Biblioteca; C/ Francisco Tomás y Valiente, 11; 28049 Madrid; Tel. +34914972314; Fax +34914972317; [email protected]
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