Fast cross-validation of kernel fisher discriminant classifiers

Given n training examples, the training of a Kernel Fisher Discriminant (KFD) classifier corresponds to solving a linear system of dimension n. In cross-validating KFD, the training examples are split into 2 distinct subsets for a number of times (L) wherein a subset of m examples is used for validation and the other subset of(n - m) examples is used for training the classifier. In this case L linear systems of dimension (n - m) need to be solved. We propose a novel method for cross-validation of KFD in which instead of solving L linear systems of dimension (n - m), we compute the inverse of an n × n matrix and solve L linear systems of dimension 2m, thereby reducing the complexity when L is large and/or m is small. For typical 10-fold and leave-one-out cross-validations, the proposed algorithm is approximately 4 and (^4/9n) times respectively as efficient as the naive implementations. Simulations are provided to demonstrate the efficiency of the proposed algorithms.

Leaving the professional tennis circuit : exploratory study of experiences and reactions from elite female athletes

In 2002, Tennis Australia commissioned a report into the experiences of elite female past players on leaving the professional tennis circuit. Australian players who were in the top 800 of the Women’s Tennis Association (WTA) end of year rankings and who had left the professional circuit within the previous 15 years were asked by mail to respond to a questionnaire. The questionnaire asked players to describe their feelings about leaving the tour during the time leading up to leaving the tour to two years after retirement. The main findings of the study suggested that those who planned to leave the tour found the transition process easy, whereas those who did not plan to leave the tour found the process difficult. Most players (66%) did not regret leaving the tour, and, although the remaining players responded that they regretted leaving, none attempted a comeback. Tennis Australia has implemented strategies to assist current players on the professional tour based on the results of this study.

Youth literacy development through applied learning and the national curriculum

The introduction of a national curriculum into Australian schools coincides with an increasing body of research emphasising the importance of completing Year 12 or its equivalent if young people are to achieve successful transitions beyond school. This research is reflected in Australian government policy targets to achieve secondary school completion rates to at least 90% by 2015. State governments across the country have also embraced these targets, with some states already achieving above this level thanks to innovative curriculum and pedagogical initiatives that are more attuned to applied ways of learning.

In this chapter we examine the challenges faced by school leaders and teachers as they re-conceptualise approaches to youth literacy development through applied learning pedagogy. We begin by exploring definitions and applications of applied learning and examining the relatively recent growth of applied learning in secondary schools. We discuss the impetus for using applied learning approaches to literacy development and consider the challenges manifest in the day-to-day professional practices of secondary school teachers who use applied learning to engage young people who may otherwise leave school early. We conclude by exploring tensions emerging from the use of applied learning approaches to youth literacy development in Australia and the new demands created by a national curriculum.

Isolation and characterization of 12 polymorphic tetranucleotide microsatellite loci in the apostlebird (Struthidea cinerea)

The apostlebird (Struthidea cinerea) is an Australian endemic passerine belonging to the Corcoracidae family. The species is highly gregarious throughout the year and the name of the species refers to the apparent prevalence of social groups of around 12 birds. The species is becoming a model system for the study of sociality in vertebrates, which will require the analysis of relatedness, paternity and maternity. We characterize 12 microsatellite loci tested for polymorphism on 25 individuals from a population in western New South Wales, Australia. The number of alleles ranged from 4 to 9 per locus. Expected heterozygosities ranged from 0.69 to 0.88. This microsatellite panel will facilitate future studies that will advance our understanding of dispersal processes, inbreeding avoidance and reproductive skew in social animals.

The maternity journey in an organisational context : a case study

The transition to motherhood is a significant life event impacting on all spheres of a woman's life. In an organisational context, changes to women's relationships with their employer and to their social identity occur as they adjust to their new role. A case study was undertaken to describe and compare the workplace experiences of three female employees from one health organisation who were either preparing to commence, currently on or recently returned to work from maternity leave. At all stages of the maternity journey, women expected flexibility from their employer in negotiating their return to work and managing parenting responsibilities. Women's obligations to their employer included being open about their capacity to work and parenting situations which may interfere with their work, as well as maintaining their work performance. Within a supportive work environment that included a shared identity with managers who were also mothers, women's social identity as a worker was not significantly threatened and did not change. Social identity change may be most apparent during the transition to first-time motherhood.

The world-swimmers

For days now you have been driving across unbroken grassland, which you know you’ll never be able to leave behind forever, no matter how fast you might go, or however deep into the night you persist in your journey. The northern coast of your country is far in the distance and darkness, yet nothing is clearer to you than the knowledge that the plain you once in a while spit into will surely not disappear when it gets to the water. You have faith it will move without interruption through the breakers, even picking up speed across the ocean, until there is no more ocean—and with all the more reality if it takes on a form you could not even begin to comprehend. After so much confusion—the wrack of entire cities on sickening flats of sand—this alone seems certain.

Professional supervision : a workforce retention strategy for social work?

Retaining social workers in the workforce is a significant challenge and a considerable amount of research has focused on identifying and examining the reasons why social workers choose to leave the profession. This paper presents findings collected as part of a small-scale exploratory study into why some social workers have chosen to remain in the social work profession for many years and who consider themselves to be passionate about their careers. In particular, the paper focuses on the potential of effective professional supervision as a factor that can facilitate social worker workforce retention. Supervision was mentioned by all participants in the study as being important for their wellbeing, either throughout their social work career or at particular points along the way, and supervision was also cited as one of the reasons they were still social workers. On the basis of this research, the authors argue that regular professional supervision can increase the retention rate of social worker employees; and it is, therefore, false economy not to allocate sufficient resources for effective supervision.

Sticking around : why and how some social workers stay in the profession

Although much is known about why social workers leave the profession, much less is known about what enables some social workers to remain working in highly stressful situations for many years and retain a passion for their work. Based on in-depth interviews with six Australian social workers with at least 10 years practice experience, factors associated with retention included self-awareness, a sense of perspective, having a strong professional identity, a sense of humour, the ability to recognise and respond to the emotional impact of the work, clear separation of work and home, and a mental interlude of some intermediate activity between leaving work and arriving home. Whereas previous research has depicted job change as a sign of burnout, for participants in this study changing jobs was regarded as a preventive measure which enabled them to continue in social work.

Perspectives of sporting opportunities for remote indigenous Cape York communities

The health outcomes for Indigenous peoples are well publicised as being poorer than that of the rest of the Australian population. The importance of physical activity as part of a balanced approach to health and wellbeing are well documented. Physical inactivity is a significant risk factor for many preventable diseases that many non-Indigenous, but specifically more Indigenous peoples die from. A recent report on Indigenous health indicated that only 23% of adults living in remote and very remote areas, such as Cape York, participated in regular physical activity. Physical activity initiatives in remote Indigenous communities on Cape York are commonly delivered by external agencies that ‘fly in and fly out’. While members of Indigenous communities may engage with the initiatives while they are being provided once the external agencies leave some of the benefits made may be quickly lost. There is no current published literature on the variety, prevalence and outcomes of ‘fly-in fly-out’ physical activity programs, or on the agencies that provide them. An understanding of these factors would facilitate a better understanding of the opportunities available to Indigenous communities on Cape York and provide important foregrounding to an investigation of community capacity for physical activity. The purpose of this study was to investigate the range of physical activity programs being offered by external agencies to Indigenous Cape York communities.

Methods: Five physical activity agencies that routinely engaged with Indigenous communities on Cape York were interviewed. The semi-structured interviews focussed on what activities were being conducted; by whom; when; and their concomitant outcomes. Interviews were recorded and professionally transcribed. Transcriptions were then analysed using content analysis to identify themes.

Results: Each physical activity agency had a variety of ways of engaging with community. The key initial focus point for each provider was the local school. Contacts within the school and opportunities to provide workshop opportunities for the students then facilitated wider community engagement.

Discussion: There were limited opportunities for these agencies to build community capacity to maintain their physical activities due to a variety of reasons that included: resources (both human and material); transient populations and an entrenched culture of ‘having things done to’ rather than with Indigenous people. In order to improve the physical activity outcomes of Indigenous people on Cape York community’s strategies that engage and empower the local population to take control of their needs should be employed.

Work differences by sector for medical specialists : evidence of a public sector ethos

Work-related characteristics representative of the ethos for medical specialists have been relatively unexplored, particularly compared to the array of research on primary care physicians. Analyses of 4,166 specialists, from the first wave of the Medicine in Australia: Balancing Employment and Life (MABEL) study, revealed that specialists have a choice between either challenging work in the public sector or straightforward yet well-paid work in the private sector. Despite more challenging conditions, health and intent to leave were not key issues for specialists in the public sector, with specialists in private rooms more likely to leave the profession despite more positive work conditions. This result may be due to the public sector ethos suggested in other studies. Ultimately this study provides evidence that suggests differences in the ethos between medical specialists in the public and private sectors.

Is narrative identity four-dimensionalist?

The claim that selves are narratively constituted has attained considerable currency in both analytic and continental philosophy. However, a set of increasingly standard objections to narrative identity are also emerging. In this paper, I focus on metaphysically realist versions of narrative identity theory, showing how they both build on and differ from their neo-Lockean counterparts. But I also argue that narrative realism is implicitly committed to a four-dimensionalist, temporal-parts ontology of persons. That exposes narrative realism to the charge that the narratively constituted self, on the one hand, and the self that is the object of much of our everyday self-reference and self-experience, on the other, can’t be the same thing. This conclusion may well force narrativists to abandon metaphysical realism about narrative selves — which, in turn, may leave the invocation of ‘narrativity’ as identity-constituting somewhat under-motivated.

Opportunistic visitors : long-term behavioural response of bull sharks to food provisioning in Fiji

Shark-based tourism that uses bait to reliably attract certain species to specific sites so that divers can view them is a growing industry globally, but remains a controversial issue. We evaluate multi-year (2004–2011) underwater visual (n = 48 individuals) and acoustic tracking data (n = 82 transmitters; array of up to 16 receivers) of bull sharks Carcharhinus leucas from a long-term shark feeding site at the Shark Reef Marine Reserve and reefs along the Beqa Channel on the southern coast of Viti Levu, Fiji. Individual C. leucas showed varying degrees of site fidelity. Determined from acoustic tagging, the majority of C. leucas had site fidelity indexes >0.5 for the marine reserve (including the feeding site) and neighbouring reefs. However, during the time of the day (09:00–12:00) when feeding takes place, sharks mainly had site fidelity indexes <0.5 for the feeding site, regardless of feeding or non-feeding days. Site fidelity indexes determined by direct diver observation of sharks at the feeding site were lower compared to such values determined by acoustic tagging. The overall pattern for C. leucas is that, if present in the area, they are attracted to the feeding site regardless of whether feeding or non-feeding days, but they remain for longer periods of time (consecutive hours) on feeding days. The overall diel patterns in movement are for C. leucas to use the area around the feeding site in the morning before spreading out over Shark Reef throughout the day and dispersing over the entire array at night. Both focal observation and acoustic monitoring show that C. leucas intermittently leave the area for a few consecutive days throughout the year, and for longer time periods (weeks to months) at the end of the calendar year before returning to the feeding site.

Polyandry in a marine turtle : females make the best of a bad job

The female perspective on reproductive strategies remains one of the most active areas of debate in biology. Even though a single mating is often sufficient to satisfy the fertilization needs of most females and the act of further mating incurs costs, multiple paternity within broods or clutches is a common observation in nature. Direct or indirect advantage to females is the most popular explanation. However, the ubiquity of this explanation is being challenged by an increasing number of cases for which benefits are not evident. For the first time, we test possible fitness correlates of multiple paternity in a marine turtle, an organism that has long attracted attention in this area of research. Contrary to the wide-spread assumption that multiple mating by female marine turtles confers fitness benefits, none were apparent. In this study, the environment played a far stronger role in determining the success of clutches than whether paternity had been single or multiple. A more likely explanation for observations of multiply sired clutches in marine turtles is that these are successful outcomes of male coercion, where females have conceded to superfluous matings as a compromise. Thus, multiple matings by female marine turtles may be a form of damage control as females attempt to make the best of a bad job in response to male harassment.

The effect of prescribed fluid consumption on physiology and work behavior of wildfire fighters

The purpose of this study was to examine 1) wildfire fighters' ability to consume the prescribed fluid volume (1200 mL h-1), 2) the effect of fluid intake on plasma sodium and hydration, and 3) the effect of fluid intake on firefighters' heart rate, core temperature and activity during emergency suppression shifts. Methods: Thirty-four firefighters were divided into ad libitum (AD, n = 17) and prescribed (PR, n = 17) drinking groups. Results: PR drinkers did not meet the prescribed fluid target, yet consumed over double the volume of AD drinkers. No differences between groups in plasma sodium or hydration were noted. PR drinking resulted in lower core temperature between 2 and 6 h. This did not coincide with reduced cardiovascular strain, greater work activity or larger distances covered when compared to AD drinkers. Conclusion: Extra fluid consumption (above AD) did not improve firefighter activity or physiological function (though PR firefighters core temperature was lower earlier in their shift). Firefighter can self-regulate their fluid consumption behavior and work rate to leave the fireground euhydrated.

Firsts: performing ways first year teachers experience identity transformation

This thesis reports on research showing the survival discourse of beginning teaching has shifted from sink or swim metaphors to describe surviving transition shock and classroom management concerns to surviving contract employment. Beginning teachers are neither sinking nor swimming in this liminal state. Rather, it is as though they are on a lifeboat where they cannot feel like a ‘real’ teacher until they can operate with certainty.

Interrogating the experiences of beginning teachers, and the transformation of their identity in their first year (1yr) of teaching, the thesis explores research participants’ firsts as epiphanic or revelatory moments of identity transformation. Participants were followed for three years from upon completion of their teacher education, through their first year of teaching, up to the beginning of their third year in the profession. The major finding was that while contemporary understandings of professional identity highlight the transformative nature of the phenomenon,  contract employment had the most impact on these teachers’ identity transformation.

Teachers’ perceptions of their own professional identity affect their efficacy and professional development as well as their ability and willingness to cope with educational change (Beijaard, Verloop & Vermunt 2000). It has been reported by the Australian Education Union (AEU) and in the Victorian media in recent years that up to 50% of beginning teachers are leaving the profession within their first five years. The reasons given for this level of
attrition include workload, pay, and behaviour management, among the top concerns of beginning teachers. These categories have positioned beginning teachers in a survival discourse for many years, yet there is more to beginning teachers’ intentions to leave than their struggles to survive in the classroom. More recently in Victoria what it means to ‘survive’ has shifted to surviving the pervasive contractual nature of beginning teachers’
employment conditions.

This qualitative study seeks to question what remains concealed with regard to beginning teachers’ experiences through an investigation of the differences between and within individuals, allowing categories of description to emerge from the data rather than pre-determining categories of investigation. Data was collected from twelve participants through individual semi-structured interviews and written communication. A theatre-based research approach to representing the participants’ experiences was employed, culminating in a performance titled ‘The First Time’. The processes of scripting, rehearsing, and performing, were utilised to analyse and represent the data to expert audiences. In an aim to uncover questions that have been buried by answers, the research is oriented as a
phenomenographic inquiry. This mode of inquiry seeks to describe, analyse, and understand (Marton 1981) the qualitatively different experiences 1yr teachers undergo in their identity formation and transformation.

The results of this research reveal the destabilising effect of short-term contracts so prevalent in the current context; that status and belonging are central to 1yr teachers’ identity work. Status and belonging are positioned within survival, liminal, and hegemonic discourses; and expressed through artefacts as symbols of belonging. The low status ascribed to contractual work has a clear impact on beginning teachers’ commitment to the profession.