1,720,963 research outputs found
¿Al doble le toca el doble? La enseñanza de la proporcionalidad en la educación básica, de David Block, Tatiana Mendoza y Margarita Ramírez (reseña)
Full text linkEn este libro se discuten preguntas como ¿qué define a la proporcionalidad directa?, ¿qué tipo de problemas de los que se plantean en la escuela tienen que ver con la proporcionalidad directa?, ¿cómo suelen resolverlos los alumnos?, ¿qué dificultades puede haber?, ¿con qué otros contenidos matemáticos se vincula?, ¿qué aspectos se estudian en la primaria?, ¿cuáles en la secundaria?
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The role of cultural artifacts in the production of meaning of mathematical knowledge involved in embroidery activities from the Hñahñu culture
Full text linkInternational audienceWe identify mathematical knowledge involved in embroidery activities of the Hñahñu culture from Valle del Mezquital (Mexico), from a cultural-semiotic approach. The motivation that leads to this research is to test the viability of a teaching model (Filloy, Rojano & Puig, 2008), which considers the social and cultural aspects of the embroidery activity. We resort to the Theory of objectification (Radford, 2014) as it allows us to study the appropriation process of the mathematical knowledge involved in this activity, taking into account the cultural artifacts and the interaction between embroiderers. Among the results of this study, we can say that embroiderers establish a correspondence between the symmetries and patterns of the geometric motifs and the “symmetries” and patterns of the numerical sequence of stitches. We also found that they develop different strategies for counting and measuring the motifs, stitches and yarn strands.</p
Mathematically significant knowledge of Hñañu women embroiderers from the Valle del Mezquital: a possibility for an encounter and dialogue
No full textInternational audienceWe present some results of an ethnographic perspective-based study of mathematically significant knowledge of Hñañu women embroiderers from Valle del Mezquital (Mexico). In this contribution, we focus on an interview throughout where one embroiderer and the researchers encounter and dialogue about the realization of embroideries ordered by the clients (the researchers). This encounter (Radford, 2021) gave rise to a joint discourse built through the discourses from the culture of the embroiderers and that of the researchers. Based on these results, we reflect on the possibility of constructing encounter opportunities in classrooms between school mathematical knowledge and knowledge about embroidery. We consider that the construction of such encounters requires the active participation of members of thehistorically marginalized-indigenous communities so that the school will not be a space for the domination and homogenization of people and their knowledge
La teoría de la objetivación. Una perspectiva vigotskiana sobre conocer y devenir en la enseñanza y el aprendizaje de las matemáticas, de Luis Radford
Full text linkLuis Radford nos ofrece en este libro un recuento sistemático de la Teoría de la Objetivación (TO). Ubica a la TO como una teoría sociocultural inspirada en el
materialismo dialéctico contemporáneo; es decir, como una teoría que concibe al aprendizaje como un proceso histórico-cultural colectivo. Por “colectivo” la TO no
se refiere a un conjunto de individuos que negocian idiosincráticamente los significados de sus conocimientos matemáticos; en la TO el colectivo se refiere a individuos que trabajan juntos para satisfacer las necesidades comunitarias del grupo; colectivo se refiere a maestros y estudiantes trabajando y aprendiendo juntos, co-produciendose a sí mismos en un transfondo histórico y cultural específico. En ese sentido, una característica fundamental de la TO es dicha labor conjunta
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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