Elbow joint kinematics during cricket bowling using magneto-inertial sensors: A feasibility study

Magnetic and inertial measurement units (MIMUs) may provide an accessible, three-dimensional, in-field alternative to laboratory-restricted marker-based motion capture. Existing upper limb MIMU models have predominantly been validated with low-velocity motion and their suitability for use with sport-based movements remains relatively untested. We propose a MIMU system approach to enable the estimation of anatomically meaningful and participant-specific elbow kinematics with considerations for use with cricket bowling. A novel standardised elbow reference posture of 90 degrees flexion and 0 deg pronation, and functional definition of elbow joint axes of rotation calibrated the MIMU method model before it was validated across three experiments: (1) simple elbow rotations with a mechanical linkage; (2) low-velocity elbow rotations in human participants; and (3) low-medium velocity sport-based movements in human participants. The proposed MIMU method demonstrated high elbow kinematic measurement agreement when compared with a criterion measure across all three conditions. However, during experiment 3, sensor components neared their measurement capacity and the MIMU method elbow flexion measurement variability increased. We conclude that the proposed MIMU method can estimate anatomically referenced, participant-specific joint angles, however, the hardware specifications of currently available systems may limit application in high-velocity/acceleration situations, preventing the measurement of cricket bowling in-field for now.     

Higher Education in Hong Kong

This article describes the extraordinary expansion of higher education in Hong Kong which took place from around the mid-1980s to the mid-1990s. It considers the factors involved in this expansion with some reference to theories of policy development, and speculates on certain aspects of the situation after the 1997 handover to the People's Republic of China.     

Streams of shared knowledge: computational expansion of knowledge-flow theory

In this article, we investigate empirically the theoretical split between emphases upon specialist vs trans-specialist knowledge in the organization – or more generally between exploitation and exploration – a split that divides knowledge-flow theory at present, and hence represents an important issue for knowledge management (KM). We review the relevant literature, articulate hypotheses, and employ computational experimentation to test them empirically. Our findings provide novel, insightful understanding of the factors that contribute toward understanding the relative balance between specialist vs trans-specialist knowledge in particular, and exploitation vs exploration more generally. We offer three main contributions: (1) we critique extant theory relating to the substitutability of specialist and interspecialist knowledge; (2) we offer new conceptual insight and empirical evidence concerning substitutability of these knowledge types in the organization; and (3) we demonstrate the empirical power of computational experimentation to examine KM questions of both theoretical and practical interest.     

The impact of image characteristics on written naming in adults

The present study was aimed at investigating whether and how image characteristics influence written naming performance in adults. In three different sessions, participants had to quickly write down the names of pictured objects on a graphic tablet. Across sessions, the picture format was different, but the to-be-named objects were the same: There were black-and-white pictures (Snodgrass & Vanderwart’s [SV] 1980 drawings), grayscale and colored pictures of the SV drawings as provided by Rossion and Pourtois (2004). Linear-mixed models (LMM) were used to analyze written latencies. The main findings were the following: (1) Colorized pictures yielded shorter written naming latencies than line drawings with the grayscale pictures being situated between the two; (2) Both within- and between-picture format LMM revealed reliable effects of name agreement, objective word frequency, frequency trajectory (the effect was marginal in the grayscale condition), and imageability on written latencies. The influence of image agreement was, however, less stable (reliable only in the colorized condition in the within-picture format LMM analysis; significant with both line drawings and their colorized version only in the between-picture format LMM analysis); (3) None of the interactions with picture format reached significance except the interaction of Image agreement with Picture format. In line with Bonin, Roux, Barry, & Canell (2012b), the findings support a limited-cascading account of written word production.

     

The natural sciences: Trouble ahead? Yes

This essay expands a talk given by Professor Gross at the annual meeting of the American Academy for Liberal Education, held at St. John’s College, Santa Fe, New Mexico, October 29–30, 1993.