Time-shared computing. Implications for medical libraries

Many library data processing systems are unresponsive to the needs of librarians because of the necessity to batch-process transactions in a computer center. Such systems tend to be reportoriented rather than information-oriented with resultant problems in the timeliness of information. Time-shared computing permits multiple users to process jobs simultaneously through on-line interaction with the computer. Such systems offer to the librarian the advantages of immediate access to information, costs shared with other users, and direct man-machine interaction. This tutorial paper describes time-shared systems with applications in the library. Problems concerning the cost and present state-of-the-art of time-sharing are discussed.     

Adolescent physical activity levels: discrepancies with accelerometer data analysis

This study investigated the effects of epoch length and cut point selection on adolescent physical activity intensity quantification using vertical axis and vector magnitude (VM) measurement with the ActiGraph GT3X+ accelerometer. Four hundred and nine adolescents (211 males; 198 females) aged 12–16 years of age wore accelerometers during waking hours. The GT3X+ acceleration counts were reintegrated into 1, 5, 15, 30 and 60 s epoch lengths for both vertical axis and VM counts. One cut point was applied to vertical axis counts and three different cut points were applied to VM counts for each epoch length. Significant differences (P < 0.01) in mean total counts per day were observed between vertical axis and VM counts, and between epoch lengths for VM only. Differences in physical activity levels were observed between vertical and VM cut points, and between epoch lengths across all activity intensities. Our findings illustrate the magnitude of differences in physical activity outcomes that occur between axis measurement, cut points and epoch length. The magnitude of difference across epoch length must be considered in the interpretation of accelerometer data and seen as a confounding variable when comparing physical activity levels between studies.     

CONCEPT MAPPING OF HIGH AND AVERAGE ACHIEVING STUDENTS AND EXPERTS

Concept mapping has been used effectively to represent understanding of afield of knowledge. The maps are highly individualistic and idiosyncratic. Three high‐performing junior college students, three average performing junior college students and two university physics teachers constructed maps using 22 electricity concepts. In this study several previously used and newly developed measures were applied to the maps in an attempt to gain further insight into differences in the quality of understanding of the three groups. It was found that the concept maps constructed by high performing students differed from those of average performing students and closely resembled the concept maps of physics experts, especially when the quality of the links between concepts was taken into account.     

From balance to blasphemy: shifting metaphors for researching early childhood education

This paper seeks to make trouble for the metaphor of ‘balance’ in early childhood education research, drawing on the arguments of Gore (, ), Haraway (), McWilliam (), and a study (McArdle, ) that was designed to focus not only on teacher practice, but also to inquire into ways of speaking teacher practice. Our rationale for trouble‐making is to ask questions about the way that the imperative to ‘balance’ disallows the investigation of pedagogy as a more complex field of practice, one that is inevitably riddled with unresolved and unresolvable contradictions and tensions. To understand how it is possible to think structure as freedom, we are forced to refuse any neat distinction between what enables and what constrains (McWilliam, ). For Haraway (), inquiry is ‘blasphemous’ when it refuses to ‘see’ practices in terms of the possibility of resolution, focusing instead on the irony of their unresolvability.     

Early investment: the use of Action Research in developing the role of an educational psychologist in an early years setting

This research considers the role an educational psychologist could play within one early years setting over an academic year, using an Action Research and a Research and Development in Organisations framework. A model of practice was developed based on the needs of the setting that included being more frequently involved with casework and conducting work aimed at supporting early years practitioners and parents/carers. This research suggests there is a greater role for educational psychologists within early years, involving more than conducting casework, through providing a more holistic and intensive approach to supporting practitioners, parents/carers and children. This supports the existing literature as well as advocating a more extensive role within early intervention services.