A kinetic analysis of discus-throwing techniques

The purposes of this study were to investigate (1) the relationships between official distance and selected ground reaction measures during discus throwing; and (2) the relationships between selected ground reactions and selected lower extremity joint kinetics. Three high-speed video cameras and three force plates were used to collect three-dimensional videographic and force plate data in this study. An inverse dynamic model was used to determine the lower extremity kinetics. Multiple regression analyses were conducted to determine relationships of the selected kinematic and kinetic measures with the official distance. Official distance was significantly correlated with ground reaction forces on the left foot during the first single-support phase, on the right foot during the second single-support phase and delivery phase, and on the left foot during the delivery phase. Also, the right-hip extension and internal rotation moments and left-knee extension moment during the delivery phase were significantly correlated with official distance. These results suggest that discus throwers should drive vigorously forward during the first single-support phase and increase the landing impact force on the right foot after flight. Also they should increase forward and rightward ground reaction force on the right foot and backward and vertical force on the left foot by powerful right-hip extension and internal rotation and left-knee extension during the delivery phase. These results provide critical information regarding the training of discus-throwing techniques, and the direction of future biomechanical studies on this event.     

DNA fingerprinting on trial: the dramatic early history of a new forensic technique

The early history of "DNA fingerprinting" in the UK might have been different were it not for the accounts of two dramatic courtroom trials, made by the participants and the media, in the mid-1980s. But these reports, which misrepresented the importance DNA evidence had in the trials, left a strong impression on the British public and on judges on both sides of the Atlantic. These trials, widely considered to be the first "victories" for DNA fingerprinting, have been frequently cited as proof of the utility and reliability of the technique, in both the UK and beyond. But in reality, it was the threat of DNA evidence being used rather than the integrity or validity of it that resolved these cases. At that time, DNA fingerprinting was still in its infancy, an untried and untested technology.     

Xanthine oxidase as a marker of myocardial infarction

In the present communication, we report remarkably elevated levels of xanthine oxidase activity in the blood of the patients with myocardial infarction when compared to age and sex matched healthy persons. Highly significant increase of malondialdehyde, serving as an index of lipid peroxidation and thus free radical mediated damage, has also been found in the patients. We propose the measurement of the blood levels of xanthine oxidase, a very simple, reliable and less time consuming method as an indicator of myocardial infarction.     

A Framework for 21st-Century Career-Technical and Workforce Education Curricula

Increasingly, career-technical and workforce education professionals are challenged with determining the best ways to prepare people for work, when many of the jobs those people will perform do not exist yet. Twenty-first-century work is evolving rapidly, with some jobs going away, other types of work appearing, and many people working in jobs that do not maximize their potential. To remain relevant in this emerging landscape, a framework is needed that can structure and guide research and curriculum development in workforce preparation in an increasingly volatile and uncertain future. We examine three key components—career navigation, work ethic, and innovation—that can situate career-technical and workforce education curricula to anticipate rapid changes in workplace demands and ensure student outcomes that will be lasting and durable in the 21st-century workplace.     

Family rearing antecedents of pubertal timing

Two general evolutionary hypotheses were tested on 756 White children (397 girls) studied longitudinally: (1) rearing experiences would predict pubertal timing; and (2) children would prove differentially susceptible to rearing. Analysis of pubertal measurements, including some based on repeated physical assessments, showed that mothering and fathering, earlier and later in childhood, predicted pubertal development, but only for girls, with negative parenting appearing most influential; maternal harsh control predicted earlier menarche. Rearing effects varied by infant negative emotionality, proving stronger (and opposite) for girls who in infancy were lower rather than higher in negativity. Maternal menarche, controlled in all analyses, was a stronger predictor than rearing. Findings are discussed in terms of theory development, genetic and nutritional influences, and sample restrictions.     

Keystroke Dynamics: Establishing Keyprints to Verify Users in Online Courses

This study examined the potential use of keystroke dynamics to create keyprints (typing fingerprints) to authenticate individuals in online courses. Previous studies have determined that keystroke typing patterns are unique; in addition to replicating these findings, this study explored best practices for implementing keyprint signatures in situations other than simple password or key phrase verification. While authentication can be difficult when attempting to correctly identify individual users, the results of this study indicate that keyprints can reliably indicate negative cases (a typing sample that is likely not the intended student). The results of this study suggest that complete keyprint signatures are better than keyprint profiles (reduced keyprints based on unique typing patterns only). Results also suggest that keyprint signatures are most reliable when a variety of methods are used to obtain keyprint data (i.e., both copy typing and free typing). Small comparison samples increase the challenge of identification but do not prevent the system from identifying negative cases.     

An Evaluation of Factors Regarding Students’ Assessment of Faculty in a Business School*

Student faculty ratings are used at most institutions of higher learning for three important reasons. First, the ratings provide direct feedback to the faculty, and this enables faculty to adjust their teaching styles. Second, the ratings provide the administration with information intended to assist in guiding and mentoring faculty toward more effective pedagogical performance in the classroom. Third, the ratings also provide the administration with information to be used in the reappointment, tenure, and promotion processes, as well as for assignment of salary range adjustments and teaching awards. To be of real value, however, all of this is predicated on the use of a valid and reliable faculty‐rating instrument along with a system designed to provide both the faculty and the administration with norming reports that allow for appropriate comparisons of ratings. This article reports such a study conducted within a large department of a business school and recommends that the process used be adapted by other business school departments and other academic units across the university and at other universities to ensure a more universally appropriate usage of students’ ratings.     

Creating an Innovative Interdisciplinary Graduate Certificate Program

In response to a growing movement within higher education to provide interdisciplinary educational programs, this study describes the creation of an interdisciplinary graduate certificate program in healthcare policy and management. Building on prior research, we surveyed healthcare executives to examine their perceptions about the need for such a program and the importance of core subject areas. Drawing on our findings as well as the literature on “interactional expertise” and “wicked problems,” we provide a detailed method for launching an interdisciplinary program. Our process may be useful in guiding other institutions interested in setting up new interdisciplinary programs of their own.