Convex hulls as an hypothesis language bias

Classification learning is dominated by systems which induce large numbers of small axis-orthogonal decision surfaces which biases such systems towards particular hypothesis types. However, there is reason to believe that many domains have underlying concepts which do not involve axis orthogonal surfaces. Further, the multiplicity of small decision regions mitigates against any holistic appreciation of the theories produced by these systems, notwithstanding the fact that many of the small regions are individually comprehensible. We propose the use of less strongly biased hypothesis languages which might be expected to model' concepts using a number of structures close to the number of actual structures in the domain. An instantiation of such a language, a convex hull based classifier, CHI, has been implemented to investigate modeling concepts as a small number of large geometric structures in n-dimensional space. A comparison of the number of regions induced is made against other well-known systems on a representative selection of largely or wholly continuous valued machine learning tasks. The convex hull system is shown to produce a number of induced regions about an order of magnitude less than well-known systems and very close to the number of actual concepts. This representation, as convex hulls, allows the possibility of extraction of higher level mathematical descriptions of the induced concepts, using the techniques of computational geometry.

Contested terrain: Point Nepean, Victoria

It is within the power of place to encompass many meanings, stories, and memories. Point Nepean has always been a contested landscape. But over recent years this 'land' has been the subject of intense debate as its future status is renegotiated. Evidence overwhelmingly suggests that Point Nepean should be recognised again as a unique and inviolable whole, in spite of the Commonwealth Government's division of the land into three parcels. It has always been my contention that all decisions relating to Point Nepean should be made with a clear understanding and appreciation of the natural and cultural significance of the whole area, in the broader context of 'place', such that place governs the approach and decision-making process. It is therefore necessary to not only establish that natural and cultural heritage is inextricably linked, but that it must be approached in an integrated manner.

Teaching for life : generic capabilities that link university learning with workplace learning

Business schools are under increasing pressure to enhance the learning capability and employability of graduates. Business professional institutes and employer organizations are demanding more than the technical knowledge and skills required to perform discipline/professional specific tasks. They want graduates who can demonstrate capabilities in communication, teamwork, risk taking, decision making, problem solving, critical thinking, analytical reasoning, visioning and innovation, leadership, ethical practices, appreciation of diversity, and a commitment to social justice. Evidence in literature and reports (Karpin, 1995; Kirby, 2000; Commonwealth of Australia, 2002; Nelson, 2002) and in test data (McCowan & Richardson, 1998; Employer Survey, 1998; DETYA, 2000) shows that the employability gap7 is closed when graduates possess these generic capabilities. What is important, however, is the increasing research showing that the strategies used to develop generic capabilities lead to improved learning, both in university courses and in the workplace.

The relative importance of landscape properties for woodland birds in agricultural environments

1. Studies of landscape change are seldom conducted at scales commensurate with the processes they purport to investigate. Landscape change is a landscape-level process, yet most studies focus on patches. Even when landscape context is considered, inference remains at the patch-level. The unit of investigation must be extended beyond individual patches to whole mosaics in order to advance understanding of faunal responses to landscape change.

2. In this study, we aggregated data from multiple sites per landscape such that both the response and explanatory variables characterized 'whole' landscapes, allowing for landscape-level inference about factors influencing species' incidence.

3. We used hierarchical partitioning and Bayesian variable selection methods to develop species-specific models that examined the influence of four categories of landscape properties – habitat extent, habitat configuration, landscape composition and geographical location – on the incidence of 58 species of woodland-dependent birds in 24 agricultural landscapes (each 100 km2) in south-eastern Australia.

4. There was strong evidence for a positive effect of habitat extent for 27 species. Thirty species were related to at least one of the four landscape composition variables, and geographical location was important for 19 species. Habitat configuration was influential for 13 species and where important, the impacts of fragmentation per se were detrimental.

5. Variation among species in the influential landscape variables indicates that different species respond to different sets of cues in land mosaics. Thus, although all species were grouped a priori as 'woodland-dependent', expectations based on general ecological characteristics may prove unreliable.

6. Synthesis and applications. These results underscore the value of moving beyond the fragmentation paradigm focused on the spatial pattern of habitat vs. non-habitat, to a greater appreciation of the composition and heterogeneity of land mosaics. Landscape-level inference will enable improved conservation outcomes by recognizing the influence of landscape properties on biota and devising strategies at this scale to complement patch-based management. We provide strong empirical evidence that biodiversity management in agricultural landscapes must focus on habitat extent. Complementary management of other landscape attributes, such as habitat aggregation and intensity of agricultural land-use, will also enhance the value of agricultural landscapes for woodland birds.

Organisational decline and renewal in an Australian voluntary association

Voluntary associations are an integral fonn of social capital in democratic societies. These associations make vital contributions to community life. Many associations are successful in meeting the needs of their constituency and thrive over many decades. These long serving associations are not static vehicles, like all organisations, they are subject to internal and external pressures for change. It is a significant challenge for volunteer associations to maintain 'a watch' on the external environment whilst responding to the needs of their stakeholders. Previously vibrant associations may experience a decline in membership and social standing as a result of significant changes in society and technology. We track a nonprofit voluntary association from its inception in the 1960s through it responses to major environmental turbulence during the late 1980s, 1990s, and early 2000s when the survival of
the organisation was in doubt. We outline the changes that took place from 2003 that reorientated, revitalised and reshaped the association including a major shift in focus from services to members to services to the community. This study provides academics and practitioners with an appreciation of the forces of organisational decline and a case study of successful change in a voluntary association.

The cognitive contexts of beliefs about the healthiness of meat

Objective: The overall aim of this study was to examine a variety of belief and demographic factors that are associated with the perception that meat is intrinsically unhealthy.

Design: State-wide survey (written questionnaire) that included questions on meat and nutrition beliefs, perceived barriers and benefits of vegetarian diets, personal values, number of vegetarian friends and family members, and use and trust of health/nutrition/food information sources.

Setting: South Australia.

Subjects: Six hundred and one randomly selected South Australians and 106 non-randomly selected vegetarians and semi-vegetarians.

Results: For all respondents considered as a group, the most important predictors of the belief that meat is intrinsically unhealthy were the perceived benefits of vegetarian diets (all positive predictors). These included: (1) the perceived links between vegetarianism, peace and increased contentment; (2) animal welfare and environmental benefits; and (3) health benefits. There were differences between different dietary groups however. For non-vegetarians, social concerns about vegetarianism (positive) were most important, followed by health and non-health benefits (positive) of vegetarianism. Red meat appreciation was the strongest (positive) predictor for vegetarians, with health benefits of vegetarianism (positive) and education (negative predictor) also important.

Conclusions: The implications of the findings for health and other issues are discussed. Judgements about the healthiness of meat are likely to be related to moral and environmental beliefs and, for non-vegetarians, to social concerns about vegetarianism, in addition to health beliefs. These need to be considered if any attempts are made to influence meat consumption.

Women exposed to intimate partner violence : expectations and experiences when they encounter health care professionals : a meta-analysis of qualitative studies

Background The appropriate response of health care professionals to intimate partner violence is still a matter of debate. This article reports a meta-analysis of qualitative studies that answers 2 questions: (1) How do women with histories of intimate partner violence perceive the responses of health care professionals? and (2) How do women with histories of intimate partner violence want their health care providers to respond to disclosures of abuse?

Methods Multiple databases were searched from their start to July 1, 2004. Searches were complemented with citation tracking and contact with researchers. Inclusion criteria included a qualitative design, women 15 years or older with experience of intimate partner violence, and English language. Two reviewers independently applied criteria and extracted data. Findings from the primary studies were combined using a qualitative meta-analysis.

Results Twenty-nine articles reporting 25 studies (847 participants) were included. The emerging constructs were largely consistent across studies and did not vary by study quality. We ordered constructs by the temporal structure of consultations with health care professionals: before the abuse is discussed, at disclosure, and the immediate and further responses of the health care professional. Key constructs included a wish from women for responses from health care professionals that were nonjudgmental, nondirective, and individually tailored, with an appreciation of the complexity of partner violence. Repeated inquiry about partner violence was seen as appropriate by women who were at later stages of an abusive relationship.

Conclusion Women’s perceptions of appropriate and inappropriate responses partly depended on the context of the consultation, their own readiness to address the issue, and the nature of the relationship between the woman and the health care professional.

Soil erosion in developing countries: a socio-economic appraisal

Soil erosion is the single most important environmental degradation problem in the developing world. Despite the plethora of literature that exists on the incidence, causes and impacts of soil erosion, a concrete understanding of this complex problem is lacking. This paper examines the soil erosion problem in developing countries in order to understand the complex inter-relationships between population pressure, poverty and environmental-institutional dynamics. Two recent theoretical developments, namely Boserup's theory on population pressure, poverty and soil erosion and Lopez's theory on environmental and institutional dynamics have been reviewed. The analysis reveals that negative impacts of technical change, inappropriate government policies and poor institutions are largely responsible for the continued soil erosion in developing countries. On the other hand, potential for market-based approaches to mitigate the problem is also low due to the negative externalities involved. A deeper appreciation of institutional and environmental dynamics and policy reforms to strengthen weak institutions may help mitigate the problem.

Acting at the Nexus : integration of research, policy and practice

This report is the result of an exciting journey of discovery. As with all journeys, we have been to many exotic places, have met extraordinary people, and at times have been challenged to keep going ahead rather than retreating. Good journeys are also enjoyed best in good company. We would like to thank VicHealth for giving us the opportunity to embark on our voyage, but also specifically to some great VicHealth staff: John Biviano, Siân Lloyd, Barb Mouy and Ali Barr have all been travelers along the way, providing us with encouragement, directions and nourishment. We know that our Project Advisory Committee and the then Chief Executive of VicHealth, dr. Rob Moody, have followed our progress on the journey with great interest. A special word of thanks to professor David Hill, chair of our advisory committee and member of the VicHealth Board of Governance, to sit down with us and critically review our navigation procedures. But we could not have reached our destination without the great assistance of the people and agencies that gave us their time, energy, and sometimes precious resources, to engage in data collection for our case studies. Again, a particular word of appreciation, to professor Brian Head, and to Ruth Belben for her incredibly efficient assistance, in organising the ARACY workshop on 24 November, 2006 in which we were given an opportunity to triangulate our position with colleagues from research, policy and practice.

Editorial

This issue of Papers presents four essays canvassing a diverse range of theoretical and textual interests. Beverley Pennell’s ‘Ozzie Kids Flee the Garden of Delight: Reconfigurations of Childhood in Australian Children’s Fictions’ tracks shifts in how childhood is conceptualised in contemporary Australian fiction for children, using as focus texts Joanne Horniman’s Sand Monkeys and Odo Hirsch’s trilogy of ‘Hazel Green’ books. This essay argues that cultural discourses around children and childhood have shifted from an emphasis on adulthood and childhood as distinct and separate domains of experience, and from the idealisation of childhood as it manifested in Romantic textuality, to a blurring of boundaries between children and adults. In Australian texts, Pennell sees this shift as incorporating an increasing democratisation of power relations between adults and children, and an appreciation of the diversity of child populations. This essay invites comparative studies which explore the extent to which representations of childhood in Australian texts are similar to those evident in other national literatures for children.

Professional development online : showcasing good practice to support open, distance and flexible learning

Designing Electronic Learning and Teaching Approaches (DELTA) is an online professional development initiative to support pedagogically-appropriate teaching with technology by showcasing examples of good practice in e-learning. The site aims to increase appreciation of e-learning possibilities for teaching staff through an easy-to-access, just-in-time resource. This paper describes the site and introduces the modular evaluation approach which is being implemented to examine it from different stakeholder perspectives. It then focuses on the first evaluation module which investigates how users perceive and engage with DELTA. The paper provides the initial evaluation findings which will contribute to the ongoing improvement of DELTA as a professional development resource that supports open, distance and flexible learning.

Understanding the oil price-exchange rate nexus for the Fiji Islands

In this paper, we examine the relationship between oil price and the Fiji–US exchange rate using daily data for the period 2000–2006. We use the generalised autoregressive conditional heteroskedasticity (GARCH) and exponential GARCH (EGARCH) models to estimate the impact of oil price on the nominal exchange rate. We find that a rise in oil prices leads to an appreciation of the Fijian dollar vis-à-vis the US dollar.

Incongruence between nurses' and patients' understandings and expectations of rehabilitation

Aims and objectives. To explore nurses' understandings and expectations of rehabilitation and nurses' perceptions of patients' understandings and expectations of rehabilitation.
Background. Within the context of a broadening appreciation of the benefits of rehabilitation, interest in the nature of rehabilitation is growing. Some believe that rehabilitation services do not adequately meet the needs of patients. Others are interested in the readiness of patients to participate in rehabilitation.
Design. Qualitative.
Method. Grounded theory using data collected during interviews with nurses in five inpatient rehabilitation units and during observation of the nurses' everyday practice.
Findings. According to nurses working in inpatient rehabilitation units, there is a marked incongruence between nurses' understandings and expectations of rehabilitation and what they perceive patients to understand and expect.
Conclusion. Given these different understandings, an important nursing role is the education of patients about the nature of rehabilitation and how to optimise their rehabilitation.

Relevance to clinical practice. Before patients are transferred to rehabilitation, the purpose and nature of rehabilitation, in particular the roles of patients and nurses, needs to be explained to them. The understandings of rehabilitation that nurses in this study possessed provide a framework for the design of education materials and orientation programmes that inform patients (and their families) about rehabilitation. In addition, reinforcement of the differences between acute care and rehabilitation will assist patients new to rehabilitation to understand the central role that they themselves can play in their recovery.

What can Hannah Arendt's theorising add to equity policy activism in higher education institutions?

Human rights theory is based on universalistic moral perspectives that regard each individual as a bearer of rights. These rights are often legislated nationally and implementation mandated for institutions including higher education institutions. Arendt contests this kind of governance and ruling. Arendt argues for an agonal politics. Arendt theorises politics and power as something that cannot occur in isolation; it is through ‘acting in concert’ with others that a political community is constituted. Arendt advocates for a public space where people can take care of the ‘public things’ between them to work out how to live together. In this paper I reflect on my role promoting equity within Australian higher education institutions and explore what Arendt’s theorising can add to rethinking this kind of human rights work. Arendt argued that re-valuing politics would pave the way to a ‘new appreciation of human plurality’ (Villa 1996: 17). I will argue that the ‘Fair Chance for All’ (1990) equity policy promoted a form of identity politics within higher education institutions. I argue that Arendt’s theorising can effectively disrupt identity politics and offers a corrective to the way human rights legislation and related institutional policies tend to focus on specific target populations.

The metabolic syndrome: in need of a global mission statement

Aims The value of clinical definitions of the metabolic syndrome has been questioned, with confusion surrounding their intended use and purpose. Our aim was to construct a mission statement that outlines the value of the metabolic syndrome in clinical and public health settings.

Methods Case studies have been used to demonstrate three key points.

Results We argue here for recognition of obesity as being a crucial element within the metabolic syndrome but perhaps even more important before its development. We also contend that the concept does indeed have a role as a risk prediction tool, and that it could provide a useful metric for the scale and progress of the looming global epidemic of diabetes and cardiovascular disease.

Conclusions Through appreciation of its purpose, and recognition of both its limitations and those attributes that make it unique and valuable, we believe we have demonstrated here that the metabolic syndrome deserves its place in the global toolbox of diabetes and CVD prevention.