El papel de la memoria de trabajo en la adquisición lectora en niños de habla castellana

Resumen

En este trabajo se abordan cuestiones básicas relativas a la manipulación y retención de la información en la Memoria de Trabajo y su vinculación con la adquisición lectora desde la perspectiva de los modelos interactivos de procesamiento de la información. Se plantean cuatro experimentos aplicados a niños de nivel lector alto y bajo de primero, tercero y quinto de EGB, respectivamente. Los resultados indican que sólo existen diferencias significativas entre grupos de distinto nivel lector en aquellas tareas con mayor implicaión de componentes funcionales, mientras que las diferencias más importantes entre cursos se dan entre primero y tercero, tanto para componentes estructurales como funcionales.     

Ethical Challenges of the Information Society in the 21st Century

The paper deals with theoretical and practical challenges of the information society in the 21st century. In the first part an overview of past and current activities in the field of information ethics at UNESCO is provided (Virtual Forum, Second International Congress on Information Ethics, Observatory on the information Society). The second part presents a historical interpretation of the development of modern information society with the emerging networked world society with its characteristics of interactivity and decentralization. The diversity of moral norms and traditions within this global medium gives rise to the question concerning an Internet-morality as a challenge to ethical thinking. The third part deals with the question of our identity within the framework of a digital ontology. The concepts of “net” and “information” are analysed. A future information ethics is based on a digital ontology. Living in the information age is considered from the point of view of both an ethical imperative and the art of living.     

A STUDY OF SEMIOTIC REGISTERS IN THE DEVELOPMENT OF THE DEFINITE INTEGRAL OF FUNCTIONS OF TWO AND THREE VARIABLES

Tracing the path from a numerical Riemann sum approximating the area under a curve to a definite integral representing the precise area in various texts and online presentations, we found 3 semiotic registers that are used: the geometric register, the numerical register, and the symbolic register. The symbolic register had 3 representations: an expanded sum, a sum in sigma notation, and the definite integral. Reviewing the same texts, we found that in the presentation of double and triple integrals, not a single textbook continues to present the numerical register and the expanded sum representation of the symbolic register. They are implied and the expectation appears to be that students no longer need them. The omission of these representations is quite ubiquitous and correspondingly affects millions of students. Materials that present the missing numerical register representation and the expanded sum representation of the symbolic register throughout topics associated with double and triple integrals have been created. This paper presents the results of a clinical study on the improvement of student comprehension of multivariable integral topics when these representations are included.     

Short animation movies as advance organizers in physics teaching: a preliminary study

Background : Advance organizers are instructional materials that help students use previous knowledge to make links with new information. Short animation movies are a possible format and are well suited for physics, as they can portray dynamic phenomena and represent abstract concepts.

Purpose : The study aimed to determine guidelines for the construction of an instructional short animation movie, with the role of an advance organizer. A film was created in order to evaluate the effectiveness of the approach, making part of a physics lesson and concerning the subject ‘moment of a force’.

Sample : The study took place in a Brazilian school in the city of Arapoti, in the south region of the country. Thirty-eight students participated, having an average age of 16 and following the third year of high school.

Design and methods : Criteria drawn from a literature review directed the construction of the movie and the lesson. Data were collected using pre- and post-tests; registers of oral comments were also done during the class. The post-test included open-ended questions, allowing students to write remarks concerning the lesson and the animation.

Conclusions : The article describes steps and guidelines to orient the process of designing an animation movie with the role of advance organizer. Data indicated that the movie facilitated the construction of links between pre-existent knowledge and the new information presented in the lesson. The proposed methodology can be considered a valid framework to derive similar approaches.     

‘I will be “fighting” even more for pupils with SEN’: SENCOs' role predictions in the changing English policy context

The Coalition Government's ‘Green Paper’ (DfE 2011) proposes a systemic overhaul of services for pupils with special educational needs in England, with increased parental choice of provision and ‘sharper accountability’ (p. 67) in schools. Deadlines for various stages of this reform have not been met, and its final nature remains uncertain. This paper reveals SENCOs' insights into their changing role in this turbulent policy context. This is achieved through the thematic analysis of 227 responses to an ‘open‐ended’ question in the national Special Educational Needs Coordinator (SENCO) Survey 2012. Findings from this sample indicate that SENCOs predict that schools in England will become more inclusive, with greater shared responsibility for achievement for all, and SENCOs' increased involvement in staff training and other whole school capacity‐building activities. Respondents predict a greater partnership with parents, for whom they will provide advice and links to other services. They foresee their reduced involvement in direct teaching and an intensification of their work in other ways, especially in terms of paperwork associated with pupil tracking and other accountability measures. These changes are anticipated against a backdrop of resource cuts, requiring SENCOs to show increasing self‐reliance and imagination.     

Relationship Between Language and Concept Science Notebook Scores of English Language Learners and/or Economically Disadvantaged Students

Despite research interest in testing the effects of literacy-infused science interventions in different contexts, research exploring the relationship, if any, between academic language and conceptual understanding is scant. What little research exists does not include English language learners (ELLs) and/or economically disadvantaged (ED) student samples—students most at risk academically. This study quantitatively determined if there exists a relationship, and if so, how strong of a relationship, between ELL and ED students’ academic language and conceptual understanding based on science notebook scores used in a larger science and literacy-infused intervention with a sample of culturally diverse students. The study also considered strengths of relationships between language and concept science notebook scores within student language status groups (ELL, former ELL, and English speaking). Correlational analyses noted positive, large, and significant correlations between students’ language and concept scores overall, with the largest correlations for science notebook entries using more academic language. Large correlations also existed for ELL student entries at the end of the school year. Implications of the findings for future research and practice in science classrooms including literacy interventions, such as science notebooks, with populations of culturally diverse students are discussed.

     

Single landmark feedback-based time optimal navigation for a differential drive robot

In this paper, we propose a feedback-based control approach to execute the time optimal motion trajectories for a differential drive robot. These trajectories are composed of straight lines and rotations in place. We show that the evolution of the position of a single landmark over time, in a local reference frame, makes it possible to track a prescribed time-optimal robot’s trajectory, based on feedback of the landmark’s position. We also show that the closed-loop system is an exponentially stable one with a nonvanishing perturbation, and that globally uniformly ultimately boundedness of the tracking errors can be achieved. The two main results of this work are: 1) Our approach leverages visual servo control type of methods with tools from optimal control for executing time-optimal trajectories in the state space based on feedback information. 2) The approach is able to work with the minimum number of landmarks–only one–this represents a necessary and sufficientcondition for landmark-based navigation. Experiments in a physical robot, a nonholonomic differential drive system equipped with an omnidirectional laser sensor, are shown, which validate the proposed theoretical modelling.