Convexity in scientific collaboration networks

Convexity in a network (graph) has been recently defined as a property of each of its subgraphs to include all shortest paths between the nodes of that subgraph. It can be measured on the scale [0, 1] with 1 being assigned to fully convex networks. The largest convex component of a graph that emerges after the removal of the least number of edges is called a convex skeleton. It is basically a tree of cliques, which has been shown to have many interesting features. In this article the notions of convexity and convex skeletons in the context of scientific collaboration networks are discussed. More specifically, we analyze the co-authorship networks of Slovenian researchers in computer science, physics, sociology, mathematics, and economics and extract convex skeletons from them. We then compare these convex skeletons with the residual graphs (remainders) in terms of collaboration frequency distributions by various parameters such as the publication year and type, co-authors’ birth year, status, gender, discipline, etc. We also show the top-ranked scientists by four basic centrality measures as calculated on the original networks and their skeletons and conclude that convex skeletons may help detect influential scholars that are hardly identifiable in the original collaboration network. As their inherent feature, convex skeletons retain the properties of collaboration networks. These include high-level structural properties but also the fact that the same authors are highlighted by centrality measures. Moreover, the most important ties and thus the most important collaborations are retained in the skeletons.     

What might the school of 2030 be like? An exercise in social science fiction

ABSTRACT

This article addresses the deliberately speculative question of ‘What might the school of 2030 be like?’, with a specific focus on the influences of digital technologies. The article adopts the methodological approach of ‘social science fiction’ to explore the ways in which digital technologies might be used in one Australian high school in 2030 (Lakeside), and what this might mean for the people whose lives are enmeshed with these technologies. Through the co-construction of five social science fiction ‘vignettes’ about life within Lakeside, the article considers the increasing prevalence of dataveillance, digital deskilling and the de-territorialization of schooling. The article then goes on to consider changing relationships between time/place, material and coded structures, as well as the increasingly platformized and data-driven nature of schooling in the 2020s. The article ends by considering the ways in which critical scholars can continue to use the methodological approach of social science fiction writing with regard to unpacking the politics of digital education futures.     

Validation of a Tennis Rating Score to evaluate the technical level of children tennis players

The purpose of this study was to create a valid and reliable assessment scale for the evaluation of three basic tennis strokes (forehand, backhand, serve) for 6–12-year-old tennis players, named the Tennis Rating Score for Children (TRSC). Altogether 60 players (21: forehand, 22: backhand, 17: serve) were video recorded (30 frames per second) while performing three main tennis strokes and later evaluated using the TRSC by five tennis trainers at Day 1 and Day 7. Agreement between days and raters was examined using the intraclass correlation coefficients (ICC). A Pearson’s correlation was calculated to determine convergent validity (score related to participant’s level of experience). The reliability between raters was very high for all three main strokes (ICC_FOREHAND = 0.874; ICC_BACKHAND = 0.877; ICC_SERVE = 0.877). The intra-rater test-retests ICCs were also very high (ICC_FOREHAND = 0.885; ICC_BACKHAND = 0.891; ICC_SERVE = 0.887). A large (r_FOREHAND = 0.660) and very large (r_BACKHAND = 0.730; r_SERVE = 0.772) Pearson’s correlations were found between all the ratings and the level of experience. The TRSC is shown to be highly reliable and valid when assessing technical skills in novice players, when compared to actual assessment from coaching experts; this tool may be helpful for tennis coaches to make a more objective diagnostic of the technical level of young tennis players.     

Immediations and rhythms of speculative design: Implications for value in design-based research

This paper presents data from the first six-months of an ongoing speculative design project in which youth and researchers co-created a videogame club, and later an eSports team, in an urban youth centre in Montréal, Québec. It describes how process philosophy informed researchers’ approach to speculative design, allowing youth and researchers to co-compose a sense of value for the club and the potentials for what they could do together through the club. This speculative process is contrasted with structuralist approaches to design-based research in education, which can overly or pre-determine value and mechanisms of social change, with or without the collaboration of youth and communities.     

The prevalence of psychiatric disorder in children attending a school for pupils with emotional and behavioural difficulties

The research presented in this article suggests that young people attending schools for pupils with emotional and behavioural difficulties are more likely to experience concurrent psychiatric disorders (comorbidity) than their peers in mainstream schools. Dr Cassidy (Consultant in Child and Adolescent Psychiatry), Dr James (Consultant and Honorary Senior Lecturer in Child and Adolescent Psychiatry) and Dr Wiggs (Research Psychologist) used questionnaires and interviews with parents and teachers, together with pupil self-reporting, to gather their data. The two-stage investigation suggested that 89% of the adolescents in one school for pupils with EBD met established criteria for the diagnosis of a psychiatric disorder. Conduct disorder and attention deficit hyperactivity disorder (ADHD) emerged as the most common psychiatric difficulties, but emotional disorders were also prominent in the data. These untreated problems are likely to have significant long-term implications for the psychological and educational development of the pupils concerned, and the authors speculate on some of the ways in which psychiatric and education services might work together in order to improve the outlook.