Perception of kinematic characteristics of tennis strokes for anticipating stroke type and direction

The purpose of this study was to determine the sources of visual information used by highly skilled tennis players in anticipating their opponent's shots. In Experiment 1, motion analysis of the strokes showed that the relative motion between the racquet and forearm was different between the ground strokes and lobs, but there were no reliable kinematic differences when shot direction was varied. In Experiment 2, 12 skilled tennis players observed the opponent hitting strokes in a normal video or in a point-light display with different segments occluded. Players' anticipation accuracy was not degraded by the use of the point-light display. Occluding the racquet and forearm significantly reduced the participant's ability to determine the type of stroke produced.     

Predicting a Threshold of Perceived Facebook Post Success via Likes and Reactions: A Test of Explanatory Mechanisms

Individuals frequently engage in self-presentation via social media and can subsequently receive various simple communicative cues (paralinguistic digital affordances; PDAs) from which they may determine the success of their self-presentation, including Likes and Upvotes. Previous research has found these communicatively abstract one-click cues are interpreted idiosyncratically when received, but the quantity received matters to users in determining whether a post is “successful.” The present work probes explanatory mechanisms behind the use of PDA responses as a metric of self-presentational success, deriving hypotheses from social comparison theory, social penetration theory, and expectancy violations theory. Results from a survey (N = 255) reveal that social comparison and communicative reciprocity provide explanatory power regarding the threshold of Likes and Reactions to a Facebook post needed to consider a post successful.     

Retrieval,visualization, and mining of large radiation dosage data

Radiation dose monitoring has become an essential service that hospitals must perform. Depending on the system in place, this can result in the collection of large quantities of data, ripe for analysis. These data should include a wide variety of variables for each study because assessment of the propriety of the patient’s dose is dependent on many factors, including patient age and size, as well as the body section that is being scanned. Moreover, the scanners themselves have many properties that affect patient dose, such as model, pitch and kVp. In this paper, we propose an engine that seamlessly integrated with a clinical PACS to retrieve radiation dosage data. We devised several schemes to analyze these data through visualization and mining techniques that examine it at different scopes. We demonstrate the utility of such visual methods at examining large, noisy, and multi-dimensional data, which is embodied in the collected radiation data.     

Playing the game: examining parental engagement in schooling in post‐millennial Queensland

The abolition of the probationary year for teachers in 1991 by the Department for Education was short-lived, with new requirements for the setting of Induction Standards, monitoring of performance, the administration of assessment procedures, and the possible de-registration of new teachers introduced in the Teaching and Higher Education Act 1998. The article describes the policy context of the initiative; the characteristics of the new requirements; the complex induction problem, which needs solving; and the failed promises on induction, which preceded the new provision. It argues for a more imaginative alternative to be developed, capable of ensuring that new teachers are able to contribute actively and in meaningful ways to the reconstruction of education.     

Self-Direction, Values and Truth: Towards an Unpostmodern Re-examination

Despite its exalted status in post-war analytical educational philosophy as probably the main aim of liberal education, the basic philosophical psychology of autonomy or self-determination is prey to certain not widely acknowledged conceptual difficulties. In relation to this problem, the present paper explores different conceptions of evaluation and competing liberal and communitarian conceptions of rational choice and decision, to the ultimate end of defending a crucial connection—discerned by many ancient and modern philosophers—between rational self-direction and the possibility of objective knowledge and truth.     

Formative assessment in mathematics for engineering students

In this paper, we present a range of formative assessment types for engineering mathematics, including in-class exercises, homework, mock examination questions, table quizzes, presentations, critical analyses of statistical papers, peer-to-peer teaching, online assessments and electronic voting systems. We provide practical tips for the implementation of such assessments, with a particular focus on time or resource constraints and large class sizes, as well as effective methods of feedback. In addition, we consider the benefits of such formative assessments for students and staff.