Showing papers by "Griffith University published in 2001"

Learning through work: workplace affordances and individual engagement

Abstract: Identifies factors that shape how learning proceeds in workplaces. Focuses on the dual bases of how workplaces afford opportunities for learning and how individuals elect to engage in work activities and with the guidance provided by the workplace. Together, these dual bases for participation (co‐participation) at work, and the relations between them, are central to understanding the kinds of learning that workplaces are able to provide and how improving the quality of that learning might proceed. The readiness of the workplace to afford opportunities for individuals to engage in work activities and access direct and indirect support is a key determinant of the quality of learning in workplaces. This readiness can promote individuals’ engagement. However, this engagement remains dependent on the degree by which individuals wish to engage purposefully in the workplace.

Revisiting academics' beliefs about teaching and learning

Abstract: In the last decade, several classifications of the ways in whichacademics conceptualise teaching and learning have been proposed,including our scheme (Samuelowicz and Bain 1992). This paper reassessesthe framework described in our earlier paper, evaluates the adequacy ofthe belief dimensions and categories in that framework and considerswhether there is a `transitional' orientation to teaching and learningas argued by Kember (1997a) in his recent synthesis of the domain.Thirty-nine academics representing a range of disciplines wereinterviewed and in accordance with a `beliefs' framework we sought theirtypical ways of thinking about teaching and learning, and theirdispositions to teach in particular ways. The constant comparison method(Strauss and Corbin 1997) was applied to whole interview transcripts toidentify broad orientations to teaching and learning, which were thenanalysed to identify the qualitatively distinct beliefs constitutingthem. An extended framework of academics' beliefs about teaching andlearning is proposed in which seven orientations are described in termsof nine qualitative belief dimensions. There is considerable overlapwith our previous findings, but there also are some importantrefinements and additions. Three forms of evidence (the qualitativeanalysis itself, a hierarchical clustering based on that analysis, andnarratives of two academics) are presented to demonstrate that there arefundamental differences between teaching-centred and learning-centredorientations to teaching and learning. Thus our data are broadlyconsistent with previously reported evidence, but they provide noempirical support for Kember's (1997a) `transitional' category acting asa bridge between the two major sets of orientations.

Inter‐biome comparison of factors controlling stream metabolism

Abstract: 'SUMMARY 1. We studied whole-ecosystem metabolism in eight streams from several biomes in North America to identify controls on the rate of stream metabolism over a large geographic range. The streams studied had climates ranging from tropical to cool-temperate and from humid to arid and were all relatively uninfluenced by human disturbances. 2. Rates of gross primary production (GPP), ecosystem respiration (R) and net ecosystem production (NEP) were determined using the open-system, two-station diurnal oxygen change method. 3. Three general patterns in metabolism were evident among streams: (1) relatively high GPP with positive NEP (i.e. net oxygen production) in early afternoon, (2) moderate primary production with a distinct peak in GPP during daylight but negative NEP at all times and (3) little or no evidence of GPP during daylight and a relatively constant and negative NEP over the entire day. ', 4. Gross primary production was most strongly correlated with photosynthetically active radiation (PAR). A multiple regression model that included log PAR and stream water soluble reactive phosphorus (SRP) concentration explained 90% of the variation in log GPP. 5. Ecosystem respiration was significantly correlated with SRP concentration and size of the transient storage zone and, together, these factors,explained 73% of the variation in R. The rate of R was poorly correlated with the rate of GPP. 6. Net ecosystem production was significantly correlated only with PAR, with 53% of the variation in log NEP explained by log PAR. Only Sycamore Creek, a desert stream in Arizona, had positive NEP (GPP: R > I), supporting the idea that streams are generally net sinks rather than net sources of organic matter.

Cognitive-behavioral treatment of anxiety disorders in children: long-term (6-year) follow-up

Abstract: Authors evaluated the long-term effectiveness of cognitive-behavioral therapy (CBT) for childhood anxiety disorders. Fifty-two clients (aged 14 to 21 years) who had completed treatment an average of 6.17 years earlier were reassessed using diagnostic interviews, clinician ratings, and self- and parent-report measures. Results indicated that 85.7% no longer fulfilled the diagnostic criteria for any anxiety disorder. On a majority of other measures, gains made at 12-month follow-up were maintained. Furthermore, CBT and CBT plus family management were equally effective at long-term follow-up. These findings support the long-term clinical utility of CBT in treating children and adolescents suffering from anxiety disorders.

Evaluative and relational influences on service loyalty

Abstract: Four attitudinal components of customer loyalty were synthesised from the services literature and combined to produce a loyalty conceptualisation that excludes repurchase behaviour. This proposed conceptualisation of service loyalty was then modelled in two quantitative studies to determine the effects of potential predictors. The influence of consumers’ evaluative judgements was compared against the effects of relational outcomes. The three evaluative judgement measures were service encounter satisfaction, perceived core service quality and value for money while relational measures comprised social comfort, social regard and friendship. It was found that while personal friendship between customer and service employee was significantly associated with loyalty, service encounter satisfaction was the major predictor. It was also found that the relational factors of social comfort and social regard played indirect roles through their influence on customer’s evaluation of satisfaction and quality. Conversely, friendship was not related to the mediating variables of service encounter satisfaction and perceived core service quality.

Representation results for defeasible logic

Abstract: The importance of transformations and normal forms in logic programming, and generally in computer science, is well documented. This paper investigates transformations and normal forms in the context of Defeasible Logic, a simple but efficient formalism for nonmonotonic reasoning based on rules and priorities. The transformations described in this paper have two main benefits: on one hand they can be used as a theoretical tool that leads to a deeper understanding of the formalism, and on the other hand they have been used in the development of an efficient implementation of defeasible logic.

The Efficacy of a Universal School-based Program to Prevent Adolescent Depression

Abstract: Evaluated whether a universal school-based program, designed to prevent depression in adolescents, could be effectively implemented within the constraints of the school environment. Participants were 260 Year 9 secondary school students. Students completed measures of depressive symptoms and hopelessness and were then assigned to 1 of 3 groups: (a) Resourceful Adolescent Program-Adolescents (RAP-A), an 11-session school-based resilience building program, as part of the school curriculum; (b) Resourceful Adolescent Program-Family (RAP-F), the same program as in RAP-A, but in which each student's parents were also invited to participate in a 3-session parent program; and (c) Adolescent Watch, a comparison group in which adolescents simply completed the measures. The program was implemented with a high recruitment (88%), low attrition rate (5.8%), and satisfactory adherence to program protocol. Adolescents in either of the RAP programs reported significantly lower levels of depressive symptomatology and hopelessness at post-intervention and 10-month follow-up, compared with those in the comparison group. Adolescents also reported high satisfaction with the program. The study provides evidence for the efficacy of a school-based universal program designed to prevent depression in adolescence.

Prevention of anxiety symptoms in primary school children: preliminary results from a universal school-based trial.

Abstract: Preliminary data are presented on the effectiveness of a universal school-based intervention for the prevention of anxiety symptoms in primary school children. A sample of 489 children (aged 10-12 years) were assigned to one of three intervention conditions: a psychologist-led preventive intervention, a teacher-led preventive intervention, or a usual care (standard curriculum) with monitoring condition. The intervention offered was the Friends for Children programme, a 12-session cognitive-behavioural intervention, originally based upon Kendall's (1994) Coping Cat programme. Participants in both intervention conditions reported fewer symptoms of anxiety at post-intervention than participants in the usual care condition. These preliminary results suggest that universal programmes for childhood anxiety are promising intervention strategies that can be successfully delivered to a school-based population and integrated into the classroom curriculum.

Evaluating the FRIENDS program: a cognitive-behavioral group treatment for anxious children and their parents.

Abstract: Conducted the 1st randomized clinical trial evaluating the efficacy of the FRIENDS program, a family-based group cognitive-behavioral treatment (FGCBT) for anxious children. Children (n = 71) ranging from 6 to 10 years of age who fulfilled diagnostic criteria for separation anxiety (SAD), generalized anxiety disorder (GAD), or social phobia (SOP) were randomly allocated to FRIENDS or to a 10-week wait-list control group. The effectiveness of the intervention was evaluated at posttreatment and 12-month follow-up. Results indicated that 69% of children who completed FGCBT were diagnosis-free, compared to 6% of children completing the wait-list condition. At 12-month follow-up, 68% of children were diagnosis-free. Beneficial treatment effects were also evident on the self-report measures completed by the children and their mothers. Parents and children reported high treatment satisfaction. Results suggest that FRIENDS is an effective treatment for clinically anxious children. Limitations of this study and directions for future research are discussed.

Power station fly ash : a review of value-added utilization outside of the construction industry

Abstract: The disposal of fly ash from coal-fired power stations causes significant economic and environmental problems. A relatively small percentage of the material finds application as an ingredient in cement and other construction products, but the vast majority of material generated each year is held in ash dams or similar dumps. This unproductive use of land and the associated long-term financial burden of maintenance has led to realization that alternative uses for fly ash as a value-added product beyond incorporation in construction materials are needed. Utilization of fly ash in such areas as novel materials, waste management, recovery of metals and agriculture is reviewed in this article with the aim of looking at new areas that will expand the positive reuse of fly ash, thereby helping to reduce the environmental and economic impacts of disposal.

A Universal Prevention Trial of Anxiety and Depressive Symptomatology in Childhood: Preliminary Data from an Australian Study

Abstract: This paper describes the development and preliminary findings of a program designed to prevent the development of anxiety and depressive symptoms in children aged 10 to 13 years. Using a universal prevention approach, a total of 594 children were randomly assigned on a class-by-class basis to either a 10-session family group CBT program (FRIENDS) routinely implemented as part of the school curriculum, or to a comparison group. Pre-post intervention changes were examined universally, and for children who scored above the clinical cut-off for anxiety at pretest. Results revealed that children in the FRIENDS intervention group reported fewer anxiety symptoms, regardless of their risk status, than the comparison group at posttest. In terms of reported levels of depression, only the high anxiety group who completed the FRIENDS intervention evidenced improvements at posttest. Overall, these preliminary results appear to support the benefits of a school-based universal cognitive-behavioural intervention program. Implications of this study are discussed, and long-term follow-up measures are currently underway.

Alcohol abuse and dysfunctional eating in adolescent girls: The influence of individual differences in sensitivity to reward and punishment

Abstract: Objective An unusually high comorbidity of eating disorders and alcohol abuse has been found in clinical and community samples of young women. This paper proposes that individual differences in sensitivity to reward and punishment may influence the propensity of young women to engage in dysfunctional eating and drinking behaviour. Method The Drive for Thinness scale, the Alcohol Use Disorders Identification Test and the BIS/BAS scales were administered to 232 high school girls. Results Heightened sensitivity to reward was the better predictor of alcohol misuse while heightened sensitivity to both reward and punishment was predictive of dysfunctional eating. When categorised by group, alcohol abusing, dysfunctional eating, and comorbid girls reported greater sensitivity to reward than non-disordered girls. Girls with dysfunctional eating with and without comorbid alcohol abuse reported greater sensitivity to punishment than alcohol abusing only girls. Discussion These findings suggest that girls who abuse alcohol and have dysfunctional eating may share a vulnerability to heightened sensitivity to reward, yet be differentiated by sensitivity to punishment. © 2001 by John Wiley & Sons, Inc. Int J Eat Disord 29: 455–462, 2001.

Effects of nitridation in gate oxides grown on 4H-SiC

Abstract: Experiments have demonstrated that nitridation provides critically important improvements in the quality of SiO2–SiC interface. This article provides results and analysis aimed at developing the much needed understanding of the mechanisms and effects associated with both annealing of pregrown oxides and direct growth in NO and N2O environments. According to the model proposed in the article, nitridation plays a double role: (1) creation of strong Si≡N bonds that passivate interface traps due to dangling and strained bonds, and (2) removal of carbon and associated complex silicon–oxycarbon bonds from the interface. This understanding of the effects of nitridation is experimentally verified and used to design a superior process for gate oxide growth in the industry-preferred N2O environment.

Social identity and the development of children's group attitudes.

Abstract: This study assessed predictions drawn from social identity theory (SIT; Tajfel & Turner) concerning the acquisition of young children's intra- and intergroup attitudes and cognitions. In a minimal group study, 5- and 8-year-old children (N = 258) were arbitrarily assigned to teams that varied in their drawing ability (social status). In addition, the study varied the extent to which the children believed they could change teams (social mobility) and whether the team had additional positive qualities beyond their drawing skill (social change). The children subsequently rated their liking for, and similarity to, the ingroup and the outgroup and the extent to which they wished to change groups. Consistent with SIT and research with adults, the results indicated that children as young as 5 years of age were sensitive to the status of their social group, and that ingroup status has important implications for both their desire to remain group members as well as their perceived similarity to other group members. The extent to which the findings provide support for SIT and the intergroup similarities between adults and children are discussed.

Consumer brand classifications: an assessment of culture‐of‐origin versus country‐of‐origin

Abstract: Examines consumers’ perception of brands as influenced by their origins and the differences in classification ability between consumers’ knowledge levels. Specifically, culture‐of‐brand‐origin (COBO) is proposed to have replaced country‐of‐origin (COO) as the most important origin influence regarded by consumers in their perceptions of brands. Culture‐of‐brand‐origin is used to mean the cultural origin or heritage of a brand. Data were gathered from 459 respondents in the Asian city of Singapore; and used to assess Singaporean consumers’ ability to classify the cultural origins of fashion clothing brands. This was compared to their ability to classify the country origins of the same brands. Six brands were used in a between‐subjects design, with three brands of western countries and three of eastern countries. Results indicate that consumers can more readily identify the cultural origin of brands over their country‐of‐origin. Reveals that a consumer’s ability to make this distinction is influenced by the consumer’s perception of how well he/she knows the brand.

The supportive care needs of men with prostate cancer (2000)

Abstract: The diagnosis and subsequent treatment of prostate cancer is followed by a range of significant disease specific and iatrogenic sequelae. However, the supportive care needs of men with prostate cancer are not well described in the literature. The present study assesses the supportive care needs of men with prostate cancer who are members of prostate cancer self-help groups in Queensland, Australia. In all, 206 men aged between 48 and 85 years (mean = 68) completed the Supportive Care Needs Survey (SCNS) (62% response). The SCNS is a validated measure assessing perceived need in the domains of psychological needs, health system and information needs, physical and daily living needs, patient care and support, and sexuality. Items assessing need for access to services and resources were also included. One third of the sample reported a moderate to high need for help for multiple items in the sexuality, psychological and health system and information domains. Younger men reported greater need in the sexuality domain; living in major urban centres was predictive of greater psychological need; being closer to the time of diagnosis was related to greater need for help in the physical and daily living domain; having prostate cancer that is not in remission, having received radiation therapy, and lower levels of education were predictive of greater need for help in patient care and support. Of the total sample, 55% of men had used alternative cancer treatments in the past 12 months, with younger and more educated men more likely to use alternative therapies. Interventions in sexuality, psychological concerns and informational support are priorities for men with prostate cancer. Copyright (C) 2001 John Wiley & Sons, Ltd.

Inciting Legal Fictions: 'Disability's' date with Ontology and the Ableist Body of Law

Abstract: Activists with 'disabilities' have placed great trust in the legal body to deliver freedoms in the form of equality rights and protections against discrimination. This article argues that, while such equalisation initiatives have provided remedies in the lives of some individuals with 'disabilities', the sub-text of 'disability' as negative ontology has remained substantially unchallenged. Understanding disability requires more sustained attention to the ontological nature of disability, in particular the ways in which a 'disabled person' is produced. The article opens with a discussion of the difficult and complex(ing) area of ontology - in particular the performativity of 'disability' as a history of unthought and then moves on to a discussion of the ways 'disabled bodies' negotiate the symbol trade in 'disability' within the confines of the ableist regime of law. The increasing disability ontology wars are foregrounded by discussing the ways in which 'negative ontologies' are written into the practices and effects of law. As such, the article's focal concerns extend to law's understanding of the autonomous individual and technologies of freedom, strategies of 'social injuries', and attempts to introduce new formations of disability related to matters of 'election' and 'mitigation'. These battles over the (re)writing of disability are important because they affect the access of people with disabilities to welfare provision, protection under anti-discrimination legislation and formations of the perfectible, abled human self. Finally, the article concludes by suggesting that the law's continual reiteration of defective corporeality through the signification of 'disability' as legal proclamation (prescription) not only disallows the 'disabled' subject any escape from the normalising practices of compensation and mitigation but continues to negate possibilities of imagining the desiring 'disabled subject' in any voluptuous way.

Women's preference for a cesarean section: incidence and associated factors

Abstract: Background:Few studies have examined women's preferences for birth. The object of this study was to determine the incidence of women's preferred type of birth, and the reasons and factors associated with their preference.Methods:Three hundred and ten women between 36 and 40 weeks' gestation were recruited from the antenatal clinic of a major metropolitan teaching hospital and the consulting rooms of six private obstetricians in Brisbane, Australia. Participants completed a questionnaire asking about their preferred type of birth, reasons for their preference, preparation for childbirth, level of anxiety and concerns, and the influence of the primary caregiver.Results:Two hundred and ninety women (93.5%) preferred a spontaneous vaginal birth; 20 women (6.4%) preferred a cesarean section. Of the latter group, most had a current obstetric complication or experienced a previously complicated delivery (p <0.001); 1 woman (0.3%) preferred a cesarean section in the absence of any known current or previous obstetric complication. Women who preferred a cesarean section were more anxious, were generally poorly informed of the risks of this procedure, and/or overestimated the safety of the procedure.Conclusions:Women who preferred a cesarean section were more likely to have experienced this type of birth previously and to have negative feelings about it. To decrease women's preference for a cesarean section, practitioners should reduce the primary cesarean delivery rate and improve the quality of emotional care for women who require a cesarean section. Caregivers should engage in a sensitive discussion of the risks and benefits of various birth options, including a vaginal birth after cesarean, with women who have previously experienced a cesarean birth before they make decisions about mode of delivery in a subsequent pregnancy.

A computer-aided diagnosis system for digital mammograms based on fuzzy-neural and feature extraction techniques

Abstract: An intelligent computer-aided diagnosis system can be very helpful for radiologist in detecting and diagnosing microcalcification patterns earlier and faster than typical screening programs. In this paper, we present a system based on fuzzy-neural and feature extraction techniques for detecting and diagnosing microcalcifications' patterns in digital mammograms. We have investigated and analyzed a number of feature extraction techniques and found that a combination of three features (such as entropy, standard deviation and number of pixels) is the best combination to distinguish a benign microcalcification pattern from one that is malignant. A fuzzy technique in conjunction with three features was used to detect a microcalcification pattern and a neural network was used to classify it into benign/malignant. The system was developed on a Microsoft Windows platform. It is an easy-to-use intelligent system that gives the user options to diagnose, detect, enlarge, zoom and measure distances of areas in digital mammograms.