2843 research outputs found
Sort by
On a question of Erdős on doubly stochastic matrices
No full textIn a celebrated paper of Marcus and Ree (1959), it was shown that if A=[a_{ij}] is an n times n doubly stochastic matrix, then there is a permutation sigma such that the sum sum of the absolute squares of its elements is less or equal to the sum from i=1 to n of a_{i,\sigma(i)}. Erdös asked for which doubly stochastic matrices the inequality is saturated. Although Marcus and Ree provided some insight for the set of solutions, the question appears to have fallen into oblivion. Our goal is to provide a complete answer in the particular, yet non-trivial, case when n=3
Exact Short Products From Truncated Multipliers
Get PDFWe sometimes need to compute the most significant digits of the product of small integers with a multiplier requiring much storage: e.g., a large integer (e.g., 5100) or an irrational number (π). We only need to access the most significant digits of the multiplier-as long as the integers are sufficiently small. We provide an efficient algorithm to compute the range of integers given a truncated multiplier and a desired number of digits
Parsing Millions of URLs per Second
Get PDFURLs are fundamental elements of web applications. By applying vector algorithms, we built a fast standard-compliant C++ implementation. Our parser uses three times fewer instructions than competing parsers following the WHATWG standard (e.g., Servo's rust-url) and up to eight times fewer instructions than the popular curl parser. The Node.js environment adopted our C++ library. In our tests on realistic data, a recent Node.js version (20.0) with our parser is four to five times faster than the last version with the legacy URL parser
Exploración de Python en la automatización del análisis lingüístico: dos estudios de caso en la enseñanza de lenguas a distancia
Get PDFEn el contexto de la educación a distancia resulta fundamental contar con recursos pedagógicos que respalden la autonomía del estudiante, especialmente en la enseñanza de segundas lenguas. Comprender cómo los estudiantes adquieren y usan el idioma permite diseñar materiales que fomenten la efectividad en el aprendizaje. La investigación en adquisición de segundas lenguas y el análisis de corpus juegan un papel esencial en este contexto. En este estudio, exploramos el uso de Python y de sus librerías como alternativa gratuita y de código abierto para el análisis automático de corpus, mostrando ejemplos específicos como el análisis de la asignación de género en español y del uso del gerundio en inglés
Wiki as an open educational resource in asynchronous courses: benefits and challenges
Get PDFSince 2013, TÉLUQ University (Quebec, Canada) has been using MediaWiki software for the Wiki-TEDia project to build an open educational resource (OER) aligning the asynchronous nature of wiki writing with self-paced student learning and the institutional model of continuous enrollment. Wiki-TEDia applies contribution-oriented pedagogy and OER-enabled pedagogy in self-paced educational technology courses. The primary goal of Wiki-TEDia is to create a comprehensive repository of scientific knowledge on teaching methods and strategies, engaging students in the collaborative creation of OERs beneficial to their professional community. The repository has grown continuously, achieving its goal of creating a detailed inventory of teaching methods. By 2023, after 10 years, Wiki-TEDia contained 135 teaching models, methods, and strategies, each described on a separate web page. Despite variations in form and scientific quality, the number of visits and positive feedback confirm the repository's success and social relevance. A quantitative evaluation conducted in July 2021 revealed that the repository had accumulated 5.5 million unique visits. Student participation has exceeded expectations. They expressed satisfaction and pride in contributing to the wiki and appreciated the repository as a valuable resource for their professional practice, even after leaving the university. The Wiki-TEDia project successfully embodies the core attributes of open pedagogy in distance learning, including participatory technologies, openness and transparency, innovation and creativity, sharing ideas and resources, a connected community, learner-generated content, reflective practice, and peer review
La recherche documentaire de qualité: une clé pour l’utilisation des données probantes en éducation
Get PDFRecension des écrits, revue de littérature, recension systématique, voilà des termes que l’on retrouve en éducation et plus particulièrement dans les travaux de recherche. En tant que membre de cette communauté, est-ce que nous nous comprenons réellement dans tous ces termes ? Avons-nous les méthodes nécessaires pour faire progresser collectivement notre domaine ? Dans un contexte où les questions à propos des données probantes en éducation soulèvent les débats et échanges, clarifier les concepts, idées et notions peut s’avérer utile. Lors de cet atelier les participant.es pourront découvrir en quoi la recherche documentaire systématique représente une clé de voute sur laquelle tous les types de travaux de recherche peuvent s’appuyer
Quelle appréciation de la formation à distance aujourd’hui? Le point de vue de quelques enseignants en contexte postpandémique (rubrique débats et discussions)
Get PDFLa pandémie a été l’occasion, pour beaucoup d’enseignants, de découvrir ou d’approfondir leurs connaissances et compétences en formation à distance (FAD). Qu’ils aient déjà de l’expérience ou non, il a fallu passer dans l’urgence de la présence à la distance pour s’adapter aux exigences des mesures sanitaires. Ce faisant, les représentations et opinions concernant la FAD ont pu évoluer. Alors que l’urgence dans laquelle s’est opéré le passage à la FAD pourrait avoir détérioré le point de vue des enseignants concernant ce mode de formation, quelques données recueillies lors d’un sondage tendent au contraire à révéler un accroissement de l’appréciation de celui-ci à tous les ordres d’enseignement. Cependant, les avis ne sont pas uniformes et il est possible de s’interroger sur la représentativité de l’échantillon de répondants ainsi que sur les liens entre représentations et pratiques. Cet article ne fait ainsi qu’ouvrir une discussion qui mériterait d’être poursuivie à la lumière d’autres données
Algumas palavras sobre o desenvolvimento do ensino a distância no Brasil. Entrevista com João Mattar
Get PDFUnravelling the complex interplay between statistical learning and working memory in Chinese children with and without dyslexia across different ages
Get PDFThe relation between statistical learning and working memory in children with developmental dyslexia (DD) remains unclear. This study employed a distributional and a conditional statistical learning experiment and a working memory task to examine this relation in 651 Chinese 6- to 12- year- olds with and without DD (NDD = 199, 101 females; NwoDD = 452, 227 females; participated 2014–2019). Results showed working memory positively associated with recognizing high-predictable and familiar items in both groups, but negatively associated with recognizing unfamiliar items in the DD group only. These findings uncovered the complex interplay between statistical learning and working memory, demonstrating how different working memory abilities in children with and without DD relate to various statistical learning mechanisms at the item level