Digital preservation of Brazilian indigenous artworks: Generating high quality textures for 3D models

Three-dimensional (3D) digital preservation aims at generating 3D models of objects that have cultural or scientific value. It allows realistic visualization of objects through virtual museums or scientific applications, and the restoration of the preserved object in case of natural wear or accidents. This work contributes to this research area by presenting a method to improve color texture quality of 3D models obtained from color and depth images of a laser scanner. Although this device offers precise depth information, the resulting color information is still poor and limits the generation of realistic textures. Our approach is to capture photographs of the object with a high-resolution digital camera and use them to generate a new color texture for the 3D model. Our work proposes a practical technique, easy to replicate, to generate high quality textures for 3D models from photographs. The method is composed by three main steps: (1) calibration of the image acquisition devices; (2) data acquisition; and (3) texture generation. In this paper, we detail our color texture generation method and apply it on the digital preservation of many artworks made by native Brazilians (indians) from the Wauja and Karaja communities. These indigenous communities are acknowledged as great ceramic artists, each bearing their own main themes, using a very rich symbolism in their paintings. Their artworks represent important aspects of the native South American culture and their digital preservation is motivated by three main reasons: (1) their fragility; (2) the paintings loose their original appearance with time; and (3) the possibility of extinction of these communities. We present several results of preserved artworks with enhanced quality realistic texture maps. Also, we present a methodology to analyze the quality and accuracy of texture maps. The resulting 3D models can be visualized through a tool we developed to support the virtual exhibit of 3D preserved heritage.     

CoSearcher: studying the effectiveness of conversational search refinement and clarification through user simulation

Information Retrieval Journal - A key application of conversational search is refining a user’s search intent by asking a series of clarification questions, aiming to improve the relevance of...     

Plato, Pascal, and the dynamics of personal knowledge

Abstract educational practices are to be based on proven scientific knowledge, not least because the function science has to perform in human culture consists of unifying practical skills and general beliefs, the episteme and the techne (Amsterdamski, 1975, pp. 43–44). Now, modern societies first of all presuppose regular and standardized ways of organizing both our concepts and our institutions. The explanatory schemata resulting from this standardization tend to destroy individualism and enchantment. But mathematics education is in fact the only place in which to treat the human subject’s relationship with mathematics. And that is what mathematics education is all about: make the human subject grow intellectually and as a person by means of mathematics. At first sight, mathematics, in its formal guise, seems the opposite of philosophy, because philosophy constructs concepts (meanings), whereas mathematics deals with extensions of concepts (sets). We shall, however, turn this problem into an instrument, using the complementarity of intensions and extensions of theoretical terms as our main device for discussing the relationship between philosophy and mathematics education. The complementarity of the “how” and the “what” of our representations outlines, in fact, the terrain on which epistemology and education are to meet.     

Effect of a congested match schedule on immune-endocrine responses,technical performance and session-RPE in elite youth soccer players

ABSTRACT

This study investigated the effects of a congested match schedule (7 matches played in 7 days) on steroid hormone concentrations, mucosal immunity, session rating of perceived exertion (S-RPE) and technical performance in 16 elite youth soccer players (14.8 ± 0.4 years; 170.6 ± 9.4 cm; 64.9 ± 7 kg). No change was observed for salivary cortisol concentration across match time points (P = 0.33; effect size [ES] = 0.13–0.48). In contrast, there was a decrease in salivary testosterone and salivary IgA (SIgA) concentrations from the 1st compared with the last time point (P = 0.01 and 0.001, ES = 0.42 and 0.67, respectively). The SIgA concentration varied across time points (P < 0.001) with the highest value observed at the 3rd time point (rest day) (3rd vs all time point; ES = 0.47–0.73). No changes were observed for S-RPE across time points (P > 0.05). A higher number of tackles and interceptions were observed during the 4th match vs 1st and 7th matches (P < 0.001; ES = 2.25 and 1.90, respectively). The present data demonstrate that accumulated fatigue related to participation in a congested match schedule might induce a decrease in testosterone concentration in youth players and negatively affect their mucosal immunity and capacity to perform certain technical actions.     

Lexical-semantic processing and reading: relations between semantic priming,visual word recognition and reading comprehension

The aim of this study was to investigate relations between lexical-semantic processing and two components of reading: visual word recognition and reading comprehension. Sixty-eight children from private schools in Porto Alegre, Brazil, from 7 to 12 years, were evaluated. Reading was assessed with a word/nonword reading task and a reading comprehension task. Lexical-semantic processing was evaluated with a semantic priming experiment. Correlations were conducted in order to examine the relations between semantic priming effects (SPEs) and performance in reading tasks. Regression analyses were performed to test the hypothesis that word reading mediates the relation between semantic priming and reading comprehension. The results showed that SPEs correlated with both word reading and reading comprehension measures. Additionally, partial mediation by word reading was found for the prediction of reading comprehension by SPEs. The results are discussed in the context of reading models and other studies relating semantic priming and reading measures.     

The knowledge of orthography is a revolution in the brain

Brain adaptation to the type of informationthat is processed has been documented inseveral conditions in animals and humans.Illiteracy due to social reasons is a goodsource of information to investigate theadaptation mechanisms to the formal knowledgeof written language. In this paper, a series ofstudies addressing this topic are reviewed.Illiterate subjects and their carefullyselected controls were compared in severalexperimental conditions. It is concluded thatschooling and in particular the knowledge oforthography introduces in the brain newstrategies for information processing thatmanifest themselves in task performance, inbrain activation studies and in anatomicalstudies.     

Violence in Schools: Perspectives (and hope) from Galtung and Buber

Research into violence in schools has been growing steadily at an international level, and has shown high degrees of violence at various different levels. Given the seriousness of the problem, finding ways of responding to this issue in schools becomes an imperative for educationists. In this article, we engage with this problem by defending the view that whilst violence might be endemic in schools, there are also real possibilities for working towards different ways of being in relationship in schools. Firstly, we discuss Galtung’s understanding of violence and peace, paying particular attention to his concepts of structural and cultural violence, peacekeeping, peacemaking and peacebuilding. Secondly, we connect Galtung’s notions of peacemaking to Buber’s philosophy of dialogue, in order to make a case for an ‘epistemological shift’ which might enable individuals and communities to achieve ‘peace’. Finally, we direct our argument to the education context and put forward some concrete proposals for peacemaking in schools.     

An ideology critique of global citizenship education

ABSTRACT

In the last two decades, global citizenship education (GCE) has become a catchphrase used by international and national educational agencies, as well as researchers, to delineate the increasing internationalisation of education, framed as an answer to the growing globalisation and the high values of citizenship. These developments, however, have created issues, due to the presence of two conflicting discourses. While the discourse of critical democracy highlights the importance of ethical values, social responsibility and active citizenry, a neoliberal discourse privileges instead a market-rationale, focused on self-investment and enhanced profits. These two discourses are not separated; they rather appear side by side, causing a confusing effect. This article aims to analyse GCE as an ideology, unveiling not only its hidden (discursive) content but also the role played by non-discursive elements in guaranteeing the coexistence of antagonistic discourses. It will be argued that not only the critical democratic discourse does not offer any resistance or threat to the neoliberal structuring of higher education, but also this discourse can function as an apologetic narrative that exculpates all of us who still want to work in universities, notwithstanding our dissatisfaction with their current commodification.