1,722,594 research outputs found
Artefacts, schèmes d’utilisation et significations arithmétiques
No full textCette contribution présente des éléments d’une expérimentation didactique conduite à l’école primaire sur une machine à calculer. L’objectif est d’amener les élèves d’une part à réfléchir sur les procédures de calcul selon les instruments utilisés, d’autre part à construire la signification d’opérateur unaire, ce qui est la notion d’addition fondant pour la machine. La conception et l’analyse de cette expérimentation sont fondées sur le cadre théorique de la médiation sémiotique d’origine vygosktienne, où les artefacts introduits en classe permettent de développer des systèmes sémiotique concourrant à l’intériorisation des concepts mathématiques incorporés dans l’artefact même. Les analyses des protocoles montrent comment ces processus se vérifient par les activités proposées
The use of perspectographs in primary school: artifacts, instruments and semiotic mediation
No full textThe experiment presented here sits within a long-term project, which started with Grade 4 students and is currently being carried out in a 5th Grade classroom (primary school). This project, about a Desarguesian form of geometry, centres on the study of cognitive processes of semiotic mediation through the use of tools (perspectographs). At the beginning the students are presented with a perspectograph and by the end they are required to construct a device to do perspective drawing. This poster illustrates the key elements of the beginning of the experiment, focused on identifying the basic components of the artefact (ocular, glass)
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
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
Transizione digitale e dimensione costituzionale dell’Unione europea: tra principi, diritti e valori = Digital transition and the constitutional dimension of the European Union: principles, rights, and values
No full textIl capitolo esamina la transizione digitale europea nella dimensione costituzionale dell’ordinamento giuridico dell’Unione. A tale proposito, l’analisi concerne dapprima vari principi generali dell’Unione, in particolare quelli relativi alle competenze e i principi del primato, dell’efficacia diretta e dell’effetto utile. In secondo luogo, il lavoro si concentra sulla Carta dei diritti fondamentali, per sondarne l’applicazione da parte della Corte di giustizia e
l’attuazione da parte del legislatore dell’Unione con riferimento a talune fattispecie particolarmente
rilevanti. Infine, vengono proposte riflessioni sull’impianto assiologico dell’Unione,
soprattutto mettendo in comunicazione recenti iniziative in tema di digitale e valori
fondanti quali stato di diritto, tutela dei diritti fondamentali e democrazia.The chapter analyses the European digital transition within the constitutional dimension
of the Union’s legal order. In this regard, the analysis first concerns various general principles
of the Union, in particular those relating to the division and exercise of the competences,
as well as the principles of primacy, direct effect and effectiveness. Secondly, there is
a focus on the Charter of Fundamental Rights to discuss its application, by the Court of Justice,
and the implementation, by the Union legislator, with reference to some relevant provisions.
Finally, reflections on the axiological system of the Union are proposed, especially
by linking certain secondary law acts with core founding values such as the rule of law, protection of fundamental rights and democracy
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
Mapping DNA topoisomerase I, RNA polymerase II and other proteins at a human gene locus during transcription inhibition
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