Exploring the development of thinking in senior secondary mathematics : a focus on probability
- Authors: Ernst, Heather
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Higher order thinking skills have been identified as desirable although elusive outcomes of many educational curricula. Through a qualitative case study, the alignment between the three levels of the curriculum: intended, implemented, and attained, was examined to determine the tensions and possibilities in the development of mathematical and thinking skills in senior secondary students in Gippsland, a large regional area of Victoria, Australia. Probability was the mathematical content area of focus. Data from document analysis of the intended curriculum, textbooks as the implemented curriculum, and assessments as the attained curriculum, was combined with qualitative data from semi-structured interviews with twenty students and fourteen senior secondary mathematics teachers. These diverse data sources scaffolded each other to identify tensions and possibilities influencing development of student thinking in senior secondary mathematics. This research demonstrated that the flow of content via the intended-implemented-attained curriculum was not adequate to describe all the influences on student learning. The lens of Activity Theory (Engeström, 2001) came closer to capturing the related complexities whereby the textbooks, calculators, bound reference books and assessments, combined with the balance of agency demonstrated by the teachers and students, were found to both support and cause tensions within the activity system. Probability was found to be a valuable topic to study in relation to the development of thinking skills due to its relevance in decision making, how it linked many areas of mathematics and the uniqueness of the classic, experimental, and subjective views of probability. This study is significant in the contribution it makes to understanding the tensions and possibilities associated with the development of mathematical thinking relating to probability through the lens of Activity Theory. While the intended curriculum encouraged a range of thinking skills, this intended curriculum could be implemented in a way that promotes memorisation rather than the intended higher order thinking. This study concludes with recommendations for the curriculum designers, textbook publishers, teachers, and students which may support the development of mathematical and thinking skills.
- Description: Doctor of Philosophy
- Authors: Ernst, Heather
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Higher order thinking skills have been identified as desirable although elusive outcomes of many educational curricula. Through a qualitative case study, the alignment between the three levels of the curriculum: intended, implemented, and attained, was examined to determine the tensions and possibilities in the development of mathematical and thinking skills in senior secondary students in Gippsland, a large regional area of Victoria, Australia. Probability was the mathematical content area of focus. Data from document analysis of the intended curriculum, textbooks as the implemented curriculum, and assessments as the attained curriculum, was combined with qualitative data from semi-structured interviews with twenty students and fourteen senior secondary mathematics teachers. These diverse data sources scaffolded each other to identify tensions and possibilities influencing development of student thinking in senior secondary mathematics. This research demonstrated that the flow of content via the intended-implemented-attained curriculum was not adequate to describe all the influences on student learning. The lens of Activity Theory (Engeström, 2001) came closer to capturing the related complexities whereby the textbooks, calculators, bound reference books and assessments, combined with the balance of agency demonstrated by the teachers and students, were found to both support and cause tensions within the activity system. Probability was found to be a valuable topic to study in relation to the development of thinking skills due to its relevance in decision making, how it linked many areas of mathematics and the uniqueness of the classic, experimental, and subjective views of probability. This study is significant in the contribution it makes to understanding the tensions and possibilities associated with the development of mathematical thinking relating to probability through the lens of Activity Theory. While the intended curriculum encouraged a range of thinking skills, this intended curriculum could be implemented in a way that promotes memorisation rather than the intended higher order thinking. This study concludes with recommendations for the curriculum designers, textbook publishers, teachers, and students which may support the development of mathematical and thinking skills.
- Description: Doctor of Philosophy
Genetic and epigenetic changes associated with polygenic left ventricular hypertrophy
- Authors: Prestes, Priscilla
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Cardiac hypertrophy (CH) is the thickening of heart muscles reducing functionality and increasing risk of cardiac disease. Commonly, pathological CH is presented as left ventricular hypertrophy (LVH) and genetic factors are known to be involved but their contribution is still poorly understood. I used the hypertrophic heart rat (HHR), a unique normotensive polygenic model of LVH, and its control strain, the normal heart rat (NHR) to investigate genetic and epigenetic contributions to LVH independent of high blood pressure. To address this study, I used a systematic approach. Firstly, I sequenced the whole genome of HHR and NHR to identify genes related to LVH, focusing on quantitative trait locus Cm22. I found the gene for tripartite motif-containing 55 (Trim55) was significantly downregulated and also presented decreased protein expression with the presence of one exonic missense mutation that altered the protein structure. Interestingly, Trim55 mRNA expression was reduced in idiopathic dilated cardiomyopathic hearts. Secondly, I selected 42 genes previously described in monogenic forms of human cardiomyopathies and studied DNA variants, mRNA and micro RNA (miRNA) expression to determine their involvement in this polygenic model of LVH at five ages. This comprehensive approach identified the differential expression of 29 genes in at least one age group and two miRNAs in validated miRNA-mRNA interactions. These two miRNAs have binding sites for five of the genes studied. Lastly, I found circular RNA (circRNA) Hrcr was upregulated in the hypertrophic heart. I then silenced Hrcr expression in human primary cardiomyocytes to investigate its miRNA downstream targets and elucidate possible regulatory mechanisms. I described four miRNAs (miR-1-3p, miR-330, miR-27a-5p, miR-299-5p) as novel targets for HRCR and predicted 359 mRNA targets in the circRNA-miRNA-mRNA regulatory axis. In silico analysis identified 206 enriched gene ontology based on the predicted mRNA target list, including cardiomyocyte differentiation and ventricular cardiac muscle cell differentiation. The findings in this thesis suggest that 1) Trim55 is a novel functional candidate gene for polygenic LVH; 2) genes implicated in monogenic forms of cardiomyopathy may be involved in this condition and 3) circRNA expression is associated with changes in hypertrophic hearts and deserve further attention.
- Description: Doctor of Philosophy
- Authors: Prestes, Priscilla
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Cardiac hypertrophy (CH) is the thickening of heart muscles reducing functionality and increasing risk of cardiac disease. Commonly, pathological CH is presented as left ventricular hypertrophy (LVH) and genetic factors are known to be involved but their contribution is still poorly understood. I used the hypertrophic heart rat (HHR), a unique normotensive polygenic model of LVH, and its control strain, the normal heart rat (NHR) to investigate genetic and epigenetic contributions to LVH independent of high blood pressure. To address this study, I used a systematic approach. Firstly, I sequenced the whole genome of HHR and NHR to identify genes related to LVH, focusing on quantitative trait locus Cm22. I found the gene for tripartite motif-containing 55 (Trim55) was significantly downregulated and also presented decreased protein expression with the presence of one exonic missense mutation that altered the protein structure. Interestingly, Trim55 mRNA expression was reduced in idiopathic dilated cardiomyopathic hearts. Secondly, I selected 42 genes previously described in monogenic forms of human cardiomyopathies and studied DNA variants, mRNA and micro RNA (miRNA) expression to determine their involvement in this polygenic model of LVH at five ages. This comprehensive approach identified the differential expression of 29 genes in at least one age group and two miRNAs in validated miRNA-mRNA interactions. These two miRNAs have binding sites for five of the genes studied. Lastly, I found circular RNA (circRNA) Hrcr was upregulated in the hypertrophic heart. I then silenced Hrcr expression in human primary cardiomyocytes to investigate its miRNA downstream targets and elucidate possible regulatory mechanisms. I described four miRNAs (miR-1-3p, miR-330, miR-27a-5p, miR-299-5p) as novel targets for HRCR and predicted 359 mRNA targets in the circRNA-miRNA-mRNA regulatory axis. In silico analysis identified 206 enriched gene ontology based on the predicted mRNA target list, including cardiomyocyte differentiation and ventricular cardiac muscle cell differentiation. The findings in this thesis suggest that 1) Trim55 is a novel functional candidate gene for polygenic LVH; 2) genes implicated in monogenic forms of cardiomyopathy may be involved in this condition and 3) circRNA expression is associated with changes in hypertrophic hearts and deserve further attention.
- Description: Doctor of Philosophy
Investigation of unconventional T cells in patients with haematological malignancies
- Authors: Develyn, Tamekha
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Haematological malignancies involve the uncontrolled division of white blood cells, which can lead to an accumulation of these cells in lymphoid organs and cause the disruption of normal immune function. Multiple Myeloma (MM) and Myelodysplastic syndromes (MDS) are the most common haematological disorders among the elderly (Elidrissi Errahhali et al, 2016), but despite recent advances in treatment options, most individuals with MM or MDS eventually relapse and succumb to the disease (Rjkumar 2020 and Schurch 2018 and Kumar et al, 2012). The association of immune defects with MM and MDS may be a factor in disease progression, therefore it is important to develop a comprehensive understanding of how the immune system changes throughout the progression of these diseases, so that more effective treatment options can be developed. This thesis presents a detailed analysis of the frequency, phenotype and function of conventional T cells, unconventional T cells and antigen presenting cells (APC) throughout the progression of MM and MDS. This analysis has identified a range of immune abnormalities within these patient groups, including novel findings that provide new insights into disease progression and potential new targets for immune therapies. Some of the abnormalities we identified in patients with MM and MDS include; a reduction in the frequency of unconventional T cell (Natural Killer T (NKT) cells and Mucosal Associated Invariant T (MAIT) cells), as well as reduced frequencies of various APC populations. We also reported an increased expression of chronic activation and exhaustion markers on CD8+ T cells and MAIT cells, despite their retention of functional capacity. Importantly, the abnormalities we observed in patients with MM were consistent from the pre-malignant disease stage to active disease, which has not been shown previously suggesting that many of these defects are present from very early in disease development. We also identified key differences in the frequency and phenotype of conventional T cells, unconventional T cells and APC between patients with MM and those with MDS. Together highlighting the many different immune changes that are occurring within these patients groups and the importance of analysing haematological malignancies as individual diseases rather than as a collective. One of the most significant findings in this thesis was the alteration in frequency and phenotype of MAIT cells within the blood of patients with MM and MDS. MAIT cells may have important roles in anti-tumour immunity, so we explored the potential causes of these changes, including soluble factors and cell-to-cell interactions between MAIT cells and APC. Interestingly, we found MM patient plasma contained increased levels of IL-18, which is a cytokine known to influence MAIT cell function. This led us to establishing a long term in vitro culture of sorted MAIT cells supplemented with IL-18, finding that culturing MAIT cells with IL-18 lead to rapid expansion of MAIT cells without otherwise alternating their phenotype or function. We next established a novel mixed-donor MAIT cell co-culture system to examine the interactions between sorted healthy MAIT cells and APC from patients. This system uniquely allowed us to investigate whether abnormal patient APC were capable of stimulating MAIT cells and whether MAIT cell responses were altered as a result of this interaction. Whilst this was conducted as a pilot study to look for potentially important interactions rather than significance, we did conclude that culturing healthy donor MAIT cells with APC from monoclonal gammopathy of undetermined significance (MGUS) and MM patients did not lead to alterations in phenotype. The development and application of these long term MAIT cell cultures shed new light on how MAIT cell defects emerge in MM and MDS, and has also provided valuable insights into optimal MAIT cell growth conditions, which could be applied in the future to analyse other complex disease settings and for the use in therapeutic approaches. Our research was the first comprehensive study to characterise immune system alterations at both the individual cell population level and to examine their functional interactions throughout all stages of MM and in MDS. We discovered a range of novel findings which have greatly improved our understanding of the role that these various immune cells populations might play in MM and MDS, and identified new areas of study that could lead to improved disease management.
- Description: Doctor of Philosophy
- Authors: Develyn, Tamekha
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Haematological malignancies involve the uncontrolled division of white blood cells, which can lead to an accumulation of these cells in lymphoid organs and cause the disruption of normal immune function. Multiple Myeloma (MM) and Myelodysplastic syndromes (MDS) are the most common haematological disorders among the elderly (Elidrissi Errahhali et al, 2016), but despite recent advances in treatment options, most individuals with MM or MDS eventually relapse and succumb to the disease (Rjkumar 2020 and Schurch 2018 and Kumar et al, 2012). The association of immune defects with MM and MDS may be a factor in disease progression, therefore it is important to develop a comprehensive understanding of how the immune system changes throughout the progression of these diseases, so that more effective treatment options can be developed. This thesis presents a detailed analysis of the frequency, phenotype and function of conventional T cells, unconventional T cells and antigen presenting cells (APC) throughout the progression of MM and MDS. This analysis has identified a range of immune abnormalities within these patient groups, including novel findings that provide new insights into disease progression and potential new targets for immune therapies. Some of the abnormalities we identified in patients with MM and MDS include; a reduction in the frequency of unconventional T cell (Natural Killer T (NKT) cells and Mucosal Associated Invariant T (MAIT) cells), as well as reduced frequencies of various APC populations. We also reported an increased expression of chronic activation and exhaustion markers on CD8+ T cells and MAIT cells, despite their retention of functional capacity. Importantly, the abnormalities we observed in patients with MM were consistent from the pre-malignant disease stage to active disease, which has not been shown previously suggesting that many of these defects are present from very early in disease development. We also identified key differences in the frequency and phenotype of conventional T cells, unconventional T cells and APC between patients with MM and those with MDS. Together highlighting the many different immune changes that are occurring within these patients groups and the importance of analysing haematological malignancies as individual diseases rather than as a collective. One of the most significant findings in this thesis was the alteration in frequency and phenotype of MAIT cells within the blood of patients with MM and MDS. MAIT cells may have important roles in anti-tumour immunity, so we explored the potential causes of these changes, including soluble factors and cell-to-cell interactions between MAIT cells and APC. Interestingly, we found MM patient plasma contained increased levels of IL-18, which is a cytokine known to influence MAIT cell function. This led us to establishing a long term in vitro culture of sorted MAIT cells supplemented with IL-18, finding that culturing MAIT cells with IL-18 lead to rapid expansion of MAIT cells without otherwise alternating their phenotype or function. We next established a novel mixed-donor MAIT cell co-culture system to examine the interactions between sorted healthy MAIT cells and APC from patients. This system uniquely allowed us to investigate whether abnormal patient APC were capable of stimulating MAIT cells and whether MAIT cell responses were altered as a result of this interaction. Whilst this was conducted as a pilot study to look for potentially important interactions rather than significance, we did conclude that culturing healthy donor MAIT cells with APC from monoclonal gammopathy of undetermined significance (MGUS) and MM patients did not lead to alterations in phenotype. The development and application of these long term MAIT cell cultures shed new light on how MAIT cell defects emerge in MM and MDS, and has also provided valuable insights into optimal MAIT cell growth conditions, which could be applied in the future to analyse other complex disease settings and for the use in therapeutic approaches. Our research was the first comprehensive study to characterise immune system alterations at both the individual cell population level and to examine their functional interactions throughout all stages of MM and in MDS. We discovered a range of novel findings which have greatly improved our understanding of the role that these various immune cells populations might play in MM and MDS, and identified new areas of study that could lead to improved disease management.
- Description: Doctor of Philosophy
It takes a village to raise a family : designing desire-based community support with parents receiving a family service in south-west Ballarat
- Authors: Goff, Rachel
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: In Victoria, Australia, the family services system is characterised by high referral rates and ongoing challenges to meet the needs of families who are experiencing risks and vulnerabilities. These issues are demonstrating the fact that there is a need to strengthen the level of community support that is being provided to children and their families prior to the escalation of their circumstances. Although the current neoliberal family services system has a key policy priority of reducing and managing family risk and vulnerability, it is neglecting to account for what families no longer want or are yet to experience. This is a shortcoming that the research study that is the subject of this thesis has addressed. In the context of a place-based, government–industry–university collaboration, this research study used a human-centred design methodology to engage with eight parents who were living in the south-west region of Ballarat, Victoria – an area characterised by socio-spatial disadvantage – and receiving a family service. This research study collected data over two phases of investigation. First, it explored the parents’ conceptualisations and experiences of community support in semi-structured interviews. Second, in a design workshop and post-workshop feedback and review interviews, it examined their views, priorities and recommendations for how their self-defined communities might support them in ways that would meet their own and their families’ needs. The research study found that parents conceptualise and experience community support as primarily informal, relational and bound to interpersonal characteristics such as reciprocity, trust, connection and belonging. It also found that their key priorities were supporting their children’s needs, their growing minds and their social skills, as well as bringing people together to promote equality. The parents who participated in this study proposed four recommendations: address the systemic constraints that are impacting on social cohesion; provide more opportunities for parents to support each other; provide non-judgemental and tailored services that can be accessed as a last resort; and enable greater self-determination, equality, trust and safety. These recommendations indicate that parents do not view community support as synonymous with risk and vulnerability; rather, they consider such support enables transformative change to occur in spite of it. Therefore, this research study has provided an understanding of the support that Victorian families want from their communities and has indicated that the paradigms that underpin the family services system are potentially incompatible with parents’ needs and desires.
- Description: Doctor of Philosophy
- Authors: Goff, Rachel
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: In Victoria, Australia, the family services system is characterised by high referral rates and ongoing challenges to meet the needs of families who are experiencing risks and vulnerabilities. These issues are demonstrating the fact that there is a need to strengthen the level of community support that is being provided to children and their families prior to the escalation of their circumstances. Although the current neoliberal family services system has a key policy priority of reducing and managing family risk and vulnerability, it is neglecting to account for what families no longer want or are yet to experience. This is a shortcoming that the research study that is the subject of this thesis has addressed. In the context of a place-based, government–industry–university collaboration, this research study used a human-centred design methodology to engage with eight parents who were living in the south-west region of Ballarat, Victoria – an area characterised by socio-spatial disadvantage – and receiving a family service. This research study collected data over two phases of investigation. First, it explored the parents’ conceptualisations and experiences of community support in semi-structured interviews. Second, in a design workshop and post-workshop feedback and review interviews, it examined their views, priorities and recommendations for how their self-defined communities might support them in ways that would meet their own and their families’ needs. The research study found that parents conceptualise and experience community support as primarily informal, relational and bound to interpersonal characteristics such as reciprocity, trust, connection and belonging. It also found that their key priorities were supporting their children’s needs, their growing minds and their social skills, as well as bringing people together to promote equality. The parents who participated in this study proposed four recommendations: address the systemic constraints that are impacting on social cohesion; provide more opportunities for parents to support each other; provide non-judgemental and tailored services that can be accessed as a last resort; and enable greater self-determination, equality, trust and safety. These recommendations indicate that parents do not view community support as synonymous with risk and vulnerability; rather, they consider such support enables transformative change to occur in spite of it. Therefore, this research study has provided an understanding of the support that Victorian families want from their communities and has indicated that the paradigms that underpin the family services system are potentially incompatible with parents’ needs and desires.
- Description: Doctor of Philosophy
Manifestation of token behaviours on corporate boards; a qualitative study
- Authors: Bhardwaj, Sneh
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text: false
- Description: As boards are central to organisational performance, an ineffective board functioning has long remained a matter of concern among corporate governance researchers, board practitioners, policy makers and the media not only in India – the context of this study – but also across the regions of Asia-Pacific, Africa, Europe, and the Americas. An important aspect of boards’ ineffective working concerns directors’ token board behaviours. This debate in corporate governance circles however continuously adheres to a gender/minority-focused approach, attributing token board behaviours to the gender of minority directors on corporate boards (i.e., women directors). The study aims to examine, firstly, the selection process and criteria for corporate board directors’ appointments in India. Secondly, this thesis examines how the quota appointees are being recruited, integrated, and treated by corporate boards in India, to explain the ensuing participation of quota appointees. The third contribution is (from the third and fourth study aims) a more nuanced explanation of token board behaviours of Indian men and women directors (beyond the commonplace explanation of token board behaviours based on the number of minority directors on corporate boards) from an in-depth examination of directors’ board conduct. The research draws on three theories. Firstly, the resource dependence theory (RDT) lens is used to review the literature on board appointments. RDT supports an argument that board composition impacts board processes, dynamics, and culture, and vice versa. Secondly, the token theory, which identifies the inclusion of minority groups as a perfunctory gesture, is used as a putative explanation for effective/ineffective board participation of directors. Thirdly, the institutional theory is applied to examine the findings related to directors’ quota-based board appointments in response to institutional pressures, namely, coercive, normative, and mimetic. An interpretative phenomenological approach informs this study’s research design. I developed four research questions and, to answer these, conducted twenty-seven semi-structured interviews with Indian board directors to obtain first-hand narration of lived experiences in this context. The findings indicate that a majority of directors consider the pre-, during and post-meeting board dis-engagement, impaired board culture, poorly structured board processes, lacunae in director selection including those of the law-supported women directors and board inexperience of directors as determinants of token behaviour on boards, rather than attributing this understanding to the gender of board minorities alone. These results provide an enhanced understanding of token behaviours manifested by board directors. In so doing, new proposals for restructuring directors’ selection processes, quota law’s implementation, directors’ board roles and boards’ internal functioning are offered. The research has implications for regulators, companies, and governments attempting to enhance the corporate governance effectiveness of corporate boards by putting an end to directors’ token behaviours.
- Description: Doctor of Philosophy
Mapping Australia felix : maps, myths and mitchell
- Authors: Coleridge, Edward
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: This investigation into the oeuvre of Thomas Mitchell, the Surveyor-General of New South Wales from 1827 to 1855, intends to reveal the remarkable opus of work he produced and enquire how he achieved it. The feat that won him fame was his discovery of the rich pasturelands and picturesque landscapes in an area that is now western Victoria, which he called Australia Felix. He matched this enthusiastic name with a finely illustrated and densely detailed two-volume journal of his three exploratory journeys - ostensibly to find where the River Darling met the Murray River. Mitchell learnt his trade as a surveyor and mapmaker in Wellington’s army fighting the French in Spain and Portugal, that theatre of the Napoleonic Wars termed the Peninsular War. The objective of this thesis is twofold. The first is the exposition of a rare and remarkable atlas of battlefield plans he was commissioned to survey at the conclusion of the war, a task which took him five years in the field, but was only completed and published 25 years later. There are only two known copies of this immense tome in Australian public libraries. The parallel plan is to relate it to the wealth of imagery with which he illustrated the journal of his expedition in 1836 that discovered Australia Felix. By the artifice of fusing the magnificent maps and landscapes in the atlas with the illustrations in the journals, together with his unpublished artwork, and commissioned structures, a metaphorical map of the new Promised Land can be attempted. Set in a period of revolution and European expansion, it is a study encompassing histories of nationalism, exploration, cartography, colonisation, indigenous relations, warfare, art, and theories of landscape art, architecture, neoclassicism and romanticism, and the aesthetics of the sublime, the beautiful and the picturesque.
- Description: Doctor of Philosophy
- Authors: Coleridge, Edward
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: This investigation into the oeuvre of Thomas Mitchell, the Surveyor-General of New South Wales from 1827 to 1855, intends to reveal the remarkable opus of work he produced and enquire how he achieved it. The feat that won him fame was his discovery of the rich pasturelands and picturesque landscapes in an area that is now western Victoria, which he called Australia Felix. He matched this enthusiastic name with a finely illustrated and densely detailed two-volume journal of his three exploratory journeys - ostensibly to find where the River Darling met the Murray River. Mitchell learnt his trade as a surveyor and mapmaker in Wellington’s army fighting the French in Spain and Portugal, that theatre of the Napoleonic Wars termed the Peninsular War. The objective of this thesis is twofold. The first is the exposition of a rare and remarkable atlas of battlefield plans he was commissioned to survey at the conclusion of the war, a task which took him five years in the field, but was only completed and published 25 years later. There are only two known copies of this immense tome in Australian public libraries. The parallel plan is to relate it to the wealth of imagery with which he illustrated the journal of his expedition in 1836 that discovered Australia Felix. By the artifice of fusing the magnificent maps and landscapes in the atlas with the illustrations in the journals, together with his unpublished artwork, and commissioned structures, a metaphorical map of the new Promised Land can be attempted. Set in a period of revolution and European expansion, it is a study encompassing histories of nationalism, exploration, cartography, colonisation, indigenous relations, warfare, art, and theories of landscape art, architecture, neoclassicism and romanticism, and the aesthetics of the sublime, the beautiful and the picturesque.
- Description: Doctor of Philosophy
Measuring trustworthiness of image data in the internet of things environment
- Authors: Islam, Mohammad
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Internet of Things (IoT) image sensors generate huge volumes of digital images every day. However, easy availability and usability of photo editing tools, the vulnerability in communication channels and malicious software have made forgery attacks on image sensor data effortless and thus expose IoT systems to cyberattacks. In IoT applications such as smart cities and surveillance systems, the smooth operation depends on sensors’ sharing data with other sensors of identical or different types. Therefore, a sensor must be able to rely on the data it receives from other sensors; in other words, data must be trustworthy. Sensors deployed in IoT applications are usually limited to low processing and battery power, which prohibits the use of complex cryptography and security mechanism and the adoption of universal security standards by IoT device manufacturers. Hence, estimating the trust of the image sensor data is a defensive solution as these data are used for critical decision-making processes. To our knowledge, only one published work has estimated the trustworthiness of digital images applied to forensic applications. However, that study’s method depends on machine learning prediction scores returned by existing forensic models, which limits its usage where underlying forensics models require different approaches (e.g., machine learning predictions, statistical methods, digital signature, perceptual image hash). Multi-type sensor data correlation and context awareness can improve the trust measurement, which is absent in that study’s model. To address these issues, novel techniques are introduced to accurately estimate the trustworthiness of IoT image sensor data with the aid of complementary non-imagery (numeric) data-generating sensors monitoring the same environment. The trust estimation models run in edge devices, relieving sensors from computationally intensive tasks. First, to detect local image forgery (splicing and copy-move attacks), an innovative image forgery detection method is proposed based on Discrete Cosine Transformation (DCT), Local Binary Pattern (LBP) and a new feature extraction method using the mean operator. Using Support Vector Machine (SVM), the proposed method is extensively tested on four well-known publicly available greyscale and colour image forgery datasets and on an IoT-based image forgery dataset that we built. Experimental results reveal the superiority of our proposed method over recent state-of-the-art methods in terms of widely used performance metrics and computational time and demonstrate robustness against low availability of forged training samples. Second, a robust trust estimation framework for IoT image data is proposed, leveraging numeric data-generating sensors deployed in the same area of interest (AoI) in an indoor environment. As low-cost sensors allow many IoT applications to use multiple types of sensors to observe the same AoI, the complementary numeric data of one sensor can be exploited to measure the trust value of another image sensor’s data. A theoretical model is developed using Shannon’s entropy to derive the uncertainty associated with an observed event and Dempster-Shafer theory (DST) for decision fusion. The proposed model’s efficacy in estimating the trust score of image sensor data is analysed by observing a fire event using IoT image and temperature sensor data in an indoor residential setup under different scenarios. The proposed model produces highly accurate trust scores in all scenarios with authentic and forged image data. Finally, as the outdoor environment varies dynamically due to different natural factors (e.g., lighting condition variations in day and night, presence of different objects, smoke, fog, rain, shadow in the scene), a novel trust framework is proposed that is suitable for the outdoor environments with these contextual variations. A transfer learning approach is adopted to derive the decision about an observation from image sensor data, while also a statistical approach is used to derive the decision about the same observation from numeric data generated from other sensors deployed in the same AoI. These decisions are then fused using CertainLogic and compared with DST-based fusion. A testbed was set up using Raspberry Pi microprocessor, image sensor, temperature sensor, edge device, LoRa nodes, LoRaWAN gateway and servers to evaluate the proposed techniques. The results show that CertainLogic is more suitable for measuring the trustworthiness of image sensor data in an outdoor environment.
- Description: Doctor of Philosophy
- Authors: Islam, Mohammad
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Internet of Things (IoT) image sensors generate huge volumes of digital images every day. However, easy availability and usability of photo editing tools, the vulnerability in communication channels and malicious software have made forgery attacks on image sensor data effortless and thus expose IoT systems to cyberattacks. In IoT applications such as smart cities and surveillance systems, the smooth operation depends on sensors’ sharing data with other sensors of identical or different types. Therefore, a sensor must be able to rely on the data it receives from other sensors; in other words, data must be trustworthy. Sensors deployed in IoT applications are usually limited to low processing and battery power, which prohibits the use of complex cryptography and security mechanism and the adoption of universal security standards by IoT device manufacturers. Hence, estimating the trust of the image sensor data is a defensive solution as these data are used for critical decision-making processes. To our knowledge, only one published work has estimated the trustworthiness of digital images applied to forensic applications. However, that study’s method depends on machine learning prediction scores returned by existing forensic models, which limits its usage where underlying forensics models require different approaches (e.g., machine learning predictions, statistical methods, digital signature, perceptual image hash). Multi-type sensor data correlation and context awareness can improve the trust measurement, which is absent in that study’s model. To address these issues, novel techniques are introduced to accurately estimate the trustworthiness of IoT image sensor data with the aid of complementary non-imagery (numeric) data-generating sensors monitoring the same environment. The trust estimation models run in edge devices, relieving sensors from computationally intensive tasks. First, to detect local image forgery (splicing and copy-move attacks), an innovative image forgery detection method is proposed based on Discrete Cosine Transformation (DCT), Local Binary Pattern (LBP) and a new feature extraction method using the mean operator. Using Support Vector Machine (SVM), the proposed method is extensively tested on four well-known publicly available greyscale and colour image forgery datasets and on an IoT-based image forgery dataset that we built. Experimental results reveal the superiority of our proposed method over recent state-of-the-art methods in terms of widely used performance metrics and computational time and demonstrate robustness against low availability of forged training samples. Second, a robust trust estimation framework for IoT image data is proposed, leveraging numeric data-generating sensors deployed in the same area of interest (AoI) in an indoor environment. As low-cost sensors allow many IoT applications to use multiple types of sensors to observe the same AoI, the complementary numeric data of one sensor can be exploited to measure the trust value of another image sensor’s data. A theoretical model is developed using Shannon’s entropy to derive the uncertainty associated with an observed event and Dempster-Shafer theory (DST) for decision fusion. The proposed model’s efficacy in estimating the trust score of image sensor data is analysed by observing a fire event using IoT image and temperature sensor data in an indoor residential setup under different scenarios. The proposed model produces highly accurate trust scores in all scenarios with authentic and forged image data. Finally, as the outdoor environment varies dynamically due to different natural factors (e.g., lighting condition variations in day and night, presence of different objects, smoke, fog, rain, shadow in the scene), a novel trust framework is proposed that is suitable for the outdoor environments with these contextual variations. A transfer learning approach is adopted to derive the decision about an observation from image sensor data, while also a statistical approach is used to derive the decision about the same observation from numeric data generated from other sensors deployed in the same AoI. These decisions are then fused using CertainLogic and compared with DST-based fusion. A testbed was set up using Raspberry Pi microprocessor, image sensor, temperature sensor, edge device, LoRa nodes, LoRaWAN gateway and servers to evaluate the proposed techniques. The results show that CertainLogic is more suitable for measuring the trustworthiness of image sensor data in an outdoor environment.
- Description: Doctor of Philosophy
Open data and interoperability standards : opportunities for animal welfare in extensive livestock systems
- Authors: Bahlo, Christiane
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Extensive livestock farming constitutes a sizeable portion of agriculture, not only in relation to land use, but in contribution to feeding a growing human population. In addition to meat, it contributes other economically valuable commodities such as wool, hides and other products. The livestock industries are adopting technologies under the banner of Precision Livestock Farming (PLF) to help meet higher production and efficiency targets as well as help to manage the multiple challenges impacting the industries, such as climate change, environmental concerns, globalisation of markets, increasing rules of governance and societal scrutiny especially in relation to animal welfare. PLF is particularly dependent on the acquisition and management of data and metadata and on the interoperability standards that allow data discovery and federation. A review of interoperability standards and PLF adoption in extensive livestock farming systems identified a lack of domain specific standards and raised questions related to the amount and quality of public data which has potential to inform livestock farming. A systematic review of public datasets, which included an assessment based on the principles that data must be findable, accessible, interoperable and reusable (FAIR) was developed. Custom software scripts were used to conduct a dataset search to determine the quantity and quality of domain specific datasets yielded 419 unique Australian datasets directly related to extensive livestock farming. A FAIR assessment of these datasets using a set of non-domain specific, general metrics showed a moderate level of compliance. The results suggest that domain specific FAIR metrics may need to be developed to provide a more accurate data quality assessment, but also that the level of interoperability and reusability is not particularly high which has implications if public data is to be included in decision support tools. To test the usefulness of available public datasets in informing decision support in relation to livestock welfare, a case study was designed and farm animal welfare elements were extracted from Australian welfare standards to guide a dataset search. It was found that with few exceptions, these elements could be supported with public data, although there were gaps in temporal and spatial coverage. The development of a geospatial animal welfare portal including these datasets further explored and confirmed the potential for using public data to enhance livestock welfare.
- Description: Doctor of Philosophy
- Authors: Bahlo, Christiane
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Extensive livestock farming constitutes a sizeable portion of agriculture, not only in relation to land use, but in contribution to feeding a growing human population. In addition to meat, it contributes other economically valuable commodities such as wool, hides and other products. The livestock industries are adopting technologies under the banner of Precision Livestock Farming (PLF) to help meet higher production and efficiency targets as well as help to manage the multiple challenges impacting the industries, such as climate change, environmental concerns, globalisation of markets, increasing rules of governance and societal scrutiny especially in relation to animal welfare. PLF is particularly dependent on the acquisition and management of data and metadata and on the interoperability standards that allow data discovery and federation. A review of interoperability standards and PLF adoption in extensive livestock farming systems identified a lack of domain specific standards and raised questions related to the amount and quality of public data which has potential to inform livestock farming. A systematic review of public datasets, which included an assessment based on the principles that data must be findable, accessible, interoperable and reusable (FAIR) was developed. Custom software scripts were used to conduct a dataset search to determine the quantity and quality of domain specific datasets yielded 419 unique Australian datasets directly related to extensive livestock farming. A FAIR assessment of these datasets using a set of non-domain specific, general metrics showed a moderate level of compliance. The results suggest that domain specific FAIR metrics may need to be developed to provide a more accurate data quality assessment, but also that the level of interoperability and reusability is not particularly high which has implications if public data is to be included in decision support tools. To test the usefulness of available public datasets in informing decision support in relation to livestock welfare, a case study was designed and farm animal welfare elements were extracted from Australian welfare standards to guide a dataset search. It was found that with few exceptions, these elements could be supported with public data, although there were gaps in temporal and spatial coverage. The development of a geospatial animal welfare portal including these datasets further explored and confirmed the potential for using public data to enhance livestock welfare.
- Description: Doctor of Philosophy
Participation, retention and dropout of children and adolescents in club-based community tennis
- Authors: Unni, Ambili
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Promoting participation in sport to achieve sporting excellence and health outcomes is a national policy of Australia. Organised, club-based sport at community level is important as it provides a pathway to elite sporting success and contributes to health and wellbeing of participants. Dropout from all forms of club-based sports including tennis occurs specifically during adolescence in Australia and internationally. Little is known about the factors that collectively influence this age group in their choice to continue playing club-sport or to drop out. This PhD program of research investigated the trends and determinants of retention and dropout among children and adolescents playing community level club-based tennis in the Australian state of Victoria. The program of research used the socio-ecological model underpinned by Leisure Constraint Theory and Fun Integration Theory to understand the different factors that influence retention. The mixed-methods explanatory sequential research design comprised of two consecutive phases of quantitative study that involved secondary data analysis of state-wide club-tennis participation and an on-line survey that examined the determinants of retention and dropout with a socio-ecological perspective. This was followed by an informed qualitative study to explore the key findings in depth. Players aged 10-18 years who were or had been registered players at tennis clubs in Victoria were invited to participate. Analysis of survey data and interviews identified a range of factors that influence and impact the decision of young players to continue playing club-based tennis or to drop out. The result from this program of research highlighted the two intrapersonal determinants ‘enjoyment’ and ‘competency’ as ‘core’ determinants of young players’ choice to be retained or to drop out. Many previous studies have listed enjoyment and competency and several other socio-ecological factors as determinants influencing retention. This research created new knowledge by explaining how each individual socio-ecological element influenced retention through enhancing or diminishing the two core determinants. Mapping of the interaction of multiple socio-ecological elements in leading to retention or dropout while presenting enjoyment and competency as core determinants is unique. Improving retention in club-based tennis during adolescence is important for maintaining participation as a habit into adulthood. As a practical way to achieve this, factors that are identified in this study as influencing enjoyment and competency can be targeted through interventions at various levels through policies and strategies in delivering club programs, coaching and competition. Competency and enjoyment are interconnected in promoting retention. Increasing access to affordable and good quality coaching promotes enjoyment through improving competency and hence should be prioritised to sustain children’s interest and passion for the game. The knowledge about interconnectivity of several apparently distinct elements reiterates the importance of a holistic approach in sport retention studies. It provides the theoretical backing for strategies aimed at retaining more children and adolescents in organised sport which is important for carrying regular physical activity habit into adulthood and ensuring sustainability of organised sports.
- Description: Doctor of Philosophy
- Authors: Unni, Ambili
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Promoting participation in sport to achieve sporting excellence and health outcomes is a national policy of Australia. Organised, club-based sport at community level is important as it provides a pathway to elite sporting success and contributes to health and wellbeing of participants. Dropout from all forms of club-based sports including tennis occurs specifically during adolescence in Australia and internationally. Little is known about the factors that collectively influence this age group in their choice to continue playing club-sport or to drop out. This PhD program of research investigated the trends and determinants of retention and dropout among children and adolescents playing community level club-based tennis in the Australian state of Victoria. The program of research used the socio-ecological model underpinned by Leisure Constraint Theory and Fun Integration Theory to understand the different factors that influence retention. The mixed-methods explanatory sequential research design comprised of two consecutive phases of quantitative study that involved secondary data analysis of state-wide club-tennis participation and an on-line survey that examined the determinants of retention and dropout with a socio-ecological perspective. This was followed by an informed qualitative study to explore the key findings in depth. Players aged 10-18 years who were or had been registered players at tennis clubs in Victoria were invited to participate. Analysis of survey data and interviews identified a range of factors that influence and impact the decision of young players to continue playing club-based tennis or to drop out. The result from this program of research highlighted the two intrapersonal determinants ‘enjoyment’ and ‘competency’ as ‘core’ determinants of young players’ choice to be retained or to drop out. Many previous studies have listed enjoyment and competency and several other socio-ecological factors as determinants influencing retention. This research created new knowledge by explaining how each individual socio-ecological element influenced retention through enhancing or diminishing the two core determinants. Mapping of the interaction of multiple socio-ecological elements in leading to retention or dropout while presenting enjoyment and competency as core determinants is unique. Improving retention in club-based tennis during adolescence is important for maintaining participation as a habit into adulthood. As a practical way to achieve this, factors that are identified in this study as influencing enjoyment and competency can be targeted through interventions at various levels through policies and strategies in delivering club programs, coaching and competition. Competency and enjoyment are interconnected in promoting retention. Increasing access to affordable and good quality coaching promotes enjoyment through improving competency and hence should be prioritised to sustain children’s interest and passion for the game. The knowledge about interconnectivity of several apparently distinct elements reiterates the importance of a holistic approach in sport retention studies. It provides the theoretical backing for strategies aimed at retaining more children and adolescents in organised sport which is important for carrying regular physical activity habit into adulthood and ensuring sustainability of organised sports.
- Description: Doctor of Philosophy
Patients’ experiences of acute deterioration and Medical Emergency Team (MET) encounter : a grounded theory study
- Authors: Chung, Catherine
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Globally, considerable effort has been made to ensure hospital patients whose clinical condition deteriorates receive timely and appropriate care. Research suggests that hospitals have increasing numbers of patients who are more likely to become seriously ill during their admission due to complex problems. Recently, patient experience has been recognised as a means of assessing healthcare delivery with healthcare services across the world gathering patient experience or satisfaction data. Acute deterioration is unique and complex for all involved. However, little is known about this experience from the patient’s perspective. The purpose of this study was to generate theory about processes patients engage in when experiencing acute deterioration and MET encounter. Also, the research aimed to recognise and explain the factors that mediate patients’ experiences. The findings of this study contribute to a growing body of knowledge that will improve patient care and practice guidelines for healthcare professionals. Underpinned by the theoretical framework of symbolic interactionism, grounded theory was employed for this study. From it ontological, epistemological, and methodological underpinnings, constructivist grounded theory was considered the most suitable approach. Using purposive sampling, in-depth semi-structured interviews were conducted with 27 patients across three Australian healthcare services. Data were collected over a 12-month period, between May 2018 – May 2019 and analysed using constant comparative analysis. The theoretical model ‘Unravelling a complex experience: contextualising patients’ experiences of acute clinical deterioration and Medical Emergency Team (MET) encounter’ emerged, offering a possible explanation of patients’ actions and processes. Most patients began their journeys feeling something was wrong which triggered emotional changes (experiencing changes-before the encounter). Patient experience was influenced by a combination of physical and psychological changes and a MET response (perceiving the reality - the encounter). After the MET encounter, some patients searched for deeper understandings about their illnesses and the events that occurred, whereas others managed without further reflection (reflecting on the event-after the encounter). Contextual conditions emerged influencing patients’ experiences with three broad mediating factors identified. Some participants identified that their acute deterioration and subsequent MET encounter was unexpected, and they perceived the nature of their illness (before their acute deterioration) as stable, based on what they had been told by medical staff (expectations and illness perception). Many participants acknowledged that their experience was dependent on the health care professionals who were caring for them at the time (relationship with the MET). Past experiences of illness and hospitalisation played an important role in participants’ abilities to conceptualise their experiences of acute deterioration and MET encounter (past experiences). These factors exerted a significant influence on participants’ experiences and helps to explain the differences between them. Unravelling a complex experience: Conceptualising patients’ experiences of acute deterioration and MET encounter offers a possible explanation of patients’ meanings, actions and processes when experiencing acute deterioration and MET encounter. The theory leads to recommendations that healthcare organisations gather data about patients’ experiences of acute deterioration and MET encounters, as these provide insights and opportunity to identify challenges that can be addressed.. Findings provide an explanatory framework for similar phenomena and increase awareness of patients’ experiences to ultimately inform health policy and improve patient care. The findings highlight the need for healthcare services to instigate strategies that support patients who have experienced acute deterioration. Further research could evaluate the effectiveness of implemented strategies.
- Description: Doctor of Philosophy
- Authors: Chung, Catherine
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Globally, considerable effort has been made to ensure hospital patients whose clinical condition deteriorates receive timely and appropriate care. Research suggests that hospitals have increasing numbers of patients who are more likely to become seriously ill during their admission due to complex problems. Recently, patient experience has been recognised as a means of assessing healthcare delivery with healthcare services across the world gathering patient experience or satisfaction data. Acute deterioration is unique and complex for all involved. However, little is known about this experience from the patient’s perspective. The purpose of this study was to generate theory about processes patients engage in when experiencing acute deterioration and MET encounter. Also, the research aimed to recognise and explain the factors that mediate patients’ experiences. The findings of this study contribute to a growing body of knowledge that will improve patient care and practice guidelines for healthcare professionals. Underpinned by the theoretical framework of symbolic interactionism, grounded theory was employed for this study. From it ontological, epistemological, and methodological underpinnings, constructivist grounded theory was considered the most suitable approach. Using purposive sampling, in-depth semi-structured interviews were conducted with 27 patients across three Australian healthcare services. Data were collected over a 12-month period, between May 2018 – May 2019 and analysed using constant comparative analysis. The theoretical model ‘Unravelling a complex experience: contextualising patients’ experiences of acute clinical deterioration and Medical Emergency Team (MET) encounter’ emerged, offering a possible explanation of patients’ actions and processes. Most patients began their journeys feeling something was wrong which triggered emotional changes (experiencing changes-before the encounter). Patient experience was influenced by a combination of physical and psychological changes and a MET response (perceiving the reality - the encounter). After the MET encounter, some patients searched for deeper understandings about their illnesses and the events that occurred, whereas others managed without further reflection (reflecting on the event-after the encounter). Contextual conditions emerged influencing patients’ experiences with three broad mediating factors identified. Some participants identified that their acute deterioration and subsequent MET encounter was unexpected, and they perceived the nature of their illness (before their acute deterioration) as stable, based on what they had been told by medical staff (expectations and illness perception). Many participants acknowledged that their experience was dependent on the health care professionals who were caring for them at the time (relationship with the MET). Past experiences of illness and hospitalisation played an important role in participants’ abilities to conceptualise their experiences of acute deterioration and MET encounter (past experiences). These factors exerted a significant influence on participants’ experiences and helps to explain the differences between them. Unravelling a complex experience: Conceptualising patients’ experiences of acute deterioration and MET encounter offers a possible explanation of patients’ meanings, actions and processes when experiencing acute deterioration and MET encounter. The theory leads to recommendations that healthcare organisations gather data about patients’ experiences of acute deterioration and MET encounters, as these provide insights and opportunity to identify challenges that can be addressed.. Findings provide an explanatory framework for similar phenomena and increase awareness of patients’ experiences to ultimately inform health policy and improve patient care. The findings highlight the need for healthcare services to instigate strategies that support patients who have experienced acute deterioration. Further research could evaluate the effectiveness of implemented strategies.
- Description: Doctor of Philosophy
Patricia Violet Slater : a remarkable leader in the nursing profession in changing times
- Authors: Hamilton, Helen
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Patricia Slater opposed the entrenched traditional system of educating nurses in hospital programs and, in the years 1960-1983, she was an advocate and activist for tertiary level ducation for nurses in the general education system. Ms Slater’s educational expertise and unique position in nursing affairs, positioned her to progress nursing education at both undergraduate (basic) and graduate (post basic) levels and to take a leading role in the reform of nursing education. In this biographical account of Ms Slater’s professional life, her contribution as a pioneer and key player in the late twentieth century radical reform of nursing education, is distinguished from the collective activity of the nursing profession. The 1950s-1970s, highlighted many shortcomings in nursing practice drawing attention to the inadequacy of the contemporary preparation of nursing students. The traditional nursing education system, couched as it was in the cultural ethos of nineteenth century and rule driven, is identified as a major contributing factor to the apparent stasis in educational growth and development in Nursing. Social, cultural and political ideologies, to which the nursing profession was subject, worked to constrain and contain the profession, contributing to the apparent powerlessness of the profession to readily adjust and rectify its position. Chief among these influences was firstly, the domination and control of the medical profession over the health system and all health matters. Secondly, paternalism, that kept women in society and in the workforce subordinate to men. Thus nurses, being mostly female, were also professionally subordinated in the workplace being subject to medical control and direction. Thirdly, the Nightingale legacy of discipline and obedience in combination with the apprenticeship model of nurse education and the hierarchical organisation of nursing work, combined to encourage passive and conservative traits in nursing students that persisted over time. Ms Slater returned from nursing studies in America in 1960 with a vision as to how the nursing profession in Australia could advance and prepare nurses able to carry the profession forward, to determine the role and function of the nurse and the education required to develop nursing students at all levels. It would not be until the 1970s that sufficient numbers of nurses were ready to support the radical solution that Slater advocated, the transfer of nursing education into the general education system. Achieving this aim drew support from leading nursing organisations and the profession’s collective effort, sustained for over a decade, ultimately proved successful. Ms Slater’s thinking on nursing education, her vision for the nursing profession’s future, her philosophy and values in respect of Nursing, are drawn from her published work and some unpublished papers. Finding little to give insight into her personal reactions to events in her professional life, I approached individuals who had worked with Ms Slater ranging in time from approximately 2-12 years. Sixteen individuals were interviewed to gain their perspectives on events and their views and perceptions of Ms Slater: all but four were former employees. Interviews were taped verbatim, transcribed and reviewed by participants, all of whom agreed to be identified in the study. The official records of the College of Nursing, Australia and the then Royal Australian Nursing Federation, provided further primary source material together with the many reports of inquiries into nursing education. A diverse range of material was used to place Ms Slater’s life and the Nursing profession as a whole, in the social, cultural and political context of the times. Nursing in Australia was compared with like countries in the same time period. It was established that all were facing similar problems for much the same reasons. Patricia Slater’s leadership and expertise, were essential components in the successful achievement of tertiary level education for nurses. As a result, in the years 1984-1994, the nursing profession moved from a skilled craft towards becoming a knowledge based discipline, the equal of other health professions. The change in nurse education at that time, was as radical as that introduced to Australia by the Nightingale nurses in 1860s, in that the position and status of nurses and Nursing was radically changed on both occasions. The story of one of the most important Australian nurse leaders of the twentieth century is related for the first time in this work.
- Description: Doctor of Philosophy
- Authors: Hamilton, Helen
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Patricia Slater opposed the entrenched traditional system of educating nurses in hospital programs and, in the years 1960-1983, she was an advocate and activist for tertiary level ducation for nurses in the general education system. Ms Slater’s educational expertise and unique position in nursing affairs, positioned her to progress nursing education at both undergraduate (basic) and graduate (post basic) levels and to take a leading role in the reform of nursing education. In this biographical account of Ms Slater’s professional life, her contribution as a pioneer and key player in the late twentieth century radical reform of nursing education, is distinguished from the collective activity of the nursing profession. The 1950s-1970s, highlighted many shortcomings in nursing practice drawing attention to the inadequacy of the contemporary preparation of nursing students. The traditional nursing education system, couched as it was in the cultural ethos of nineteenth century and rule driven, is identified as a major contributing factor to the apparent stasis in educational growth and development in Nursing. Social, cultural and political ideologies, to which the nursing profession was subject, worked to constrain and contain the profession, contributing to the apparent powerlessness of the profession to readily adjust and rectify its position. Chief among these influences was firstly, the domination and control of the medical profession over the health system and all health matters. Secondly, paternalism, that kept women in society and in the workforce subordinate to men. Thus nurses, being mostly female, were also professionally subordinated in the workplace being subject to medical control and direction. Thirdly, the Nightingale legacy of discipline and obedience in combination with the apprenticeship model of nurse education and the hierarchical organisation of nursing work, combined to encourage passive and conservative traits in nursing students that persisted over time. Ms Slater returned from nursing studies in America in 1960 with a vision as to how the nursing profession in Australia could advance and prepare nurses able to carry the profession forward, to determine the role and function of the nurse and the education required to develop nursing students at all levels. It would not be until the 1970s that sufficient numbers of nurses were ready to support the radical solution that Slater advocated, the transfer of nursing education into the general education system. Achieving this aim drew support from leading nursing organisations and the profession’s collective effort, sustained for over a decade, ultimately proved successful. Ms Slater’s thinking on nursing education, her vision for the nursing profession’s future, her philosophy and values in respect of Nursing, are drawn from her published work and some unpublished papers. Finding little to give insight into her personal reactions to events in her professional life, I approached individuals who had worked with Ms Slater ranging in time from approximately 2-12 years. Sixteen individuals were interviewed to gain their perspectives on events and their views and perceptions of Ms Slater: all but four were former employees. Interviews were taped verbatim, transcribed and reviewed by participants, all of whom agreed to be identified in the study. The official records of the College of Nursing, Australia and the then Royal Australian Nursing Federation, provided further primary source material together with the many reports of inquiries into nursing education. A diverse range of material was used to place Ms Slater’s life and the Nursing profession as a whole, in the social, cultural and political context of the times. Nursing in Australia was compared with like countries in the same time period. It was established that all were facing similar problems for much the same reasons. Patricia Slater’s leadership and expertise, were essential components in the successful achievement of tertiary level education for nurses. As a result, in the years 1984-1994, the nursing profession moved from a skilled craft towards becoming a knowledge based discipline, the equal of other health professions. The change in nurse education at that time, was as radical as that introduced to Australia by the Nightingale nurses in 1860s, in that the position and status of nurses and Nursing was radically changed on both occasions. The story of one of the most important Australian nurse leaders of the twentieth century is related for the first time in this work.
- Description: Doctor of Philosophy
Shelter From the Storm. Webs of connectedness and entanglement in contemporary painting of the everyday
- Authors: Griffin, Tony
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Considering the often-overlooked objects in a single Australian suburban home through the practice of still life painting, this project examines the everyday as a means to understand our anxious times. By employing phenomenological approaches this project explores the theoretical understandings of the everyday and many recent iterations of “thing theory”. Through the practice of still life, its traditions, language and its contemporary currency, painting is employed as a means to understand this age of anxiety. My research closely observes, documents and presents the everyday objects in a single suburban Australian home in the early part of the twenty-first century. Ian Hodder’s theory of entanglement and the mutual dependency between humans and things that it proposes, is considered as a suitable tool for a contemporary visual art practitioner in creating new understandings of our domestic and broader world. Additionally, my research employs the innovative and challenging approaches to the familiar championed by the French writer Georges Perec. His work in revealing an understanding of our world through the exhaustively comprehensive and meticulous description of everyday things provides a structural basis for this project. Our homes are where we experience the everyday nature of our existence most keenly and my home is not unlike the homes of others. It is a place that shares those broader ideals considered to constitute a home, my shelter and my refuge. It is a worthy place in which to seek an understanding of our complex world. This project reveals in paint my observations of the minor things which, when combined, constitute the major things in my small home. The result of these observations is a series of representations of a familiar environment that enables an audience to recognise their own surroundings and re-evaluate the many hidden entanglements in their world in more complex and evocative ways.
- Description: Doctor of Philosophy
- Authors: Griffin, Tony
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Considering the often-overlooked objects in a single Australian suburban home through the practice of still life painting, this project examines the everyday as a means to understand our anxious times. By employing phenomenological approaches this project explores the theoretical understandings of the everyday and many recent iterations of “thing theory”. Through the practice of still life, its traditions, language and its contemporary currency, painting is employed as a means to understand this age of anxiety. My research closely observes, documents and presents the everyday objects in a single suburban Australian home in the early part of the twenty-first century. Ian Hodder’s theory of entanglement and the mutual dependency between humans and things that it proposes, is considered as a suitable tool for a contemporary visual art practitioner in creating new understandings of our domestic and broader world. Additionally, my research employs the innovative and challenging approaches to the familiar championed by the French writer Georges Perec. His work in revealing an understanding of our world through the exhaustively comprehensive and meticulous description of everyday things provides a structural basis for this project. Our homes are where we experience the everyday nature of our existence most keenly and my home is not unlike the homes of others. It is a place that shares those broader ideals considered to constitute a home, my shelter and my refuge. It is a worthy place in which to seek an understanding of our complex world. This project reveals in paint my observations of the minor things which, when combined, constitute the major things in my small home. The result of these observations is a series of representations of a familiar environment that enables an audience to recognise their own surroundings and re-evaluate the many hidden entanglements in their world in more complex and evocative ways.
- Description: Doctor of Philosophy
Teacher perceptions of changes in school infrastructure and how these impact on their teaching practice
- Authors: Zivave, Takavada
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: The impetus of this study comes from the 2009 Commonwealth Government of Australia’s $16.2 billion investment in school infrastructure under the Building the Education Revolution (BER) program. The BER program was supposed to stimulate the economy through creating construction jobs by building schools and ensuring that workers had jobs during the global financial crisis. Provision of learning spaces and learning space design was secondary to this need to create construction jobs. This thesis aimed to explore the teaching activity using an activity system based on Cultural-Historical Activity Theory (CHAT) (Engestrom, 1987) with the intent of bringing out or exposing the contribution made by the BER school infrastructure program on teaching especially around issues of pedagogy, teamwork, wellbeing, collaboration and interactions with students. Using a mixed-methods approach, the study utilised three sources of data, document analysis, online survey responses and focus group interviews. In the first phase, data were collected using a document analysis, this information guided the design of the online survey instrument, which was used to collect data in the second phase. Data collected using both the document analysis and online survey responses were used in the third phase, which involved focus group interviews. The data analysis involved identifying, grouping together and labelling document analysis, data from the online survey and transcripts of focus group interviews. These were coded and organised into themes, or units of meaning. The quantitative data was presented in frequency tables and descriptive statistics. This quantitative data was corroborated with extracts from focus group interviews and document analysis data where possible. The study’s findings demonstrated that school infrastructure supports teacher collaboration by allowing for team planning and co-teaching. Furthermore, the study revealed a link between teacher collaboration and teacher wellbeing. The study findings indicate that when teachers plan together and co-teach, their workload is reduced contributing positively to teacher wellbeing. The study suggests that a relationship exists between school infrastructure and student-teacher interactions, which serves to reduce negative interactions when dealing with outside classroom behaviour. The present study seeks to generate insights that, while unique to participants and individuals, are anticipated to be of interest to teachers more broadly. Potentially, the findings from this study could inform other educational contexts, for example, school architectural designers. Significantly, this research seeks to contribute to literature on the importance of school infrastructure on teacher performance ultimately improving student-learning outcomes.
- Description: Doctor of Philosophy
- Authors: Zivave, Takavada
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: The impetus of this study comes from the 2009 Commonwealth Government of Australia’s $16.2 billion investment in school infrastructure under the Building the Education Revolution (BER) program. The BER program was supposed to stimulate the economy through creating construction jobs by building schools and ensuring that workers had jobs during the global financial crisis. Provision of learning spaces and learning space design was secondary to this need to create construction jobs. This thesis aimed to explore the teaching activity using an activity system based on Cultural-Historical Activity Theory (CHAT) (Engestrom, 1987) with the intent of bringing out or exposing the contribution made by the BER school infrastructure program on teaching especially around issues of pedagogy, teamwork, wellbeing, collaboration and interactions with students. Using a mixed-methods approach, the study utilised three sources of data, document analysis, online survey responses and focus group interviews. In the first phase, data were collected using a document analysis, this information guided the design of the online survey instrument, which was used to collect data in the second phase. Data collected using both the document analysis and online survey responses were used in the third phase, which involved focus group interviews. The data analysis involved identifying, grouping together and labelling document analysis, data from the online survey and transcripts of focus group interviews. These were coded and organised into themes, or units of meaning. The quantitative data was presented in frequency tables and descriptive statistics. This quantitative data was corroborated with extracts from focus group interviews and document analysis data where possible. The study’s findings demonstrated that school infrastructure supports teacher collaboration by allowing for team planning and co-teaching. Furthermore, the study revealed a link between teacher collaboration and teacher wellbeing. The study findings indicate that when teachers plan together and co-teach, their workload is reduced contributing positively to teacher wellbeing. The study suggests that a relationship exists between school infrastructure and student-teacher interactions, which serves to reduce negative interactions when dealing with outside classroom behaviour. The present study seeks to generate insights that, while unique to participants and individuals, are anticipated to be of interest to teachers more broadly. Potentially, the findings from this study could inform other educational contexts, for example, school architectural designers. Significantly, this research seeks to contribute to literature on the importance of school infrastructure on teacher performance ultimately improving student-learning outcomes.
- Description: Doctor of Philosophy
The care factor of leadership : identifying and understanding workplace appreciative behaviours in the supervisory relationship
- Authors: Timmerman, Geoffrey
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Most would agree, people like to be appreciated for who they are and for the work they do. Yet, the process resulting in employees feeling appreciated is not well understood. Further, appreciation in the workplace is complex, when considering the concept’s multifaceted nature. Workplace-relevant research supports hypotheses that being appreciated at work is associated with desirable employee outcomes such as enhanced subjective well-being (SWB), higher levels of job satisfaction and performance, creativity while also benefiting organisations through higher employee productivity. Some authors even suggest that being appreciated links to physical well-being. Regardless, empirical evidence supporting a putative relationship between appreciation and key workplace outcomes (SWB, job satisfaction and happiness) is lacking; This represents a knowledge gap in the management literature. An important related question concerns optimal ways that managers can express appreciation to their employees at work, and conversely, employee preferences for the form of appreciation that they receive from their manager. Past studies investigating the influence of appreciation in the workplace, though informative, have failed to apply a rigorous process to identify forms of appreciative behaviour. To advance knowledge on forms of workplace appreciation endowed by supervisors, and how this may influence employees, the first study aim was to identify and appraise the underlying components of appreciation-type behaviours. Hence, the supervisor-employee relationship forms the central component for this study. The second study aim was to identify whether and how supervisor-enacted appreciative behaviours influence selected employee work outcomes. A review of literature pertinent to the research aims provided theoretical foundations for understanding appreciative behaviours in the workplace. These included social relationships, human motivation, workplace sources of support, dispositional versus behavioural approaches to appreciation, selected aspects of leadership and the theorised function of workplace appreciation. From this, a conceptual model of an iterative workplace appreciation cycle was proposed to support the study aims. To meet the research aims, a two-phase study approach was adopted. Firstly, a qualitative study investigated the construct of expressed appreciation (phase 1). Here, expressed supervisor appreciative behaviours were identified through 19 one-on-one, semi-structured interviews with employees from a variety of professions and employment sectors. Through a rigorous thematic analysis, five supervisor appreciative behavioural themes (Interest, Rewards, Acknowledgment, Trust and Endorsement) were established to determine what (forms of appreciative behaviours enacted by supervisors). This first thematic framework was complemented by three outcome-related themes (Cognisance, Confirmation and Commendation) capturing the why (with regard to why employees feel appreciated) as a second thematic framework. Phase 2 of the study employed an online quantitative survey directly informed by phase 1 results. The hypothetical what and why constructs forming workplace appreciative behaviours were each developed as itemised scales (20-item and 12-item, respectively). An online survey instrument gathered employee (N=206) responses for itemised scales plus workplace outcome scales measuring SWB, job satisfaction and job commitment. Factor analysis of the 20-item what scale identified workplace appreciation behaviours endowed by supervisors to comprise a three-factor structure (factors labelled acknowledgement, trust and reward). A 12-item scale representing why employees feel appreciated provided a one-factor solution. Subsequent multiple regressions revealed the factors of acknowledgement and trust to be associated (p<.05) with job satisfaction, job commitment and overall well-being. Reward was not associated with any measured employee workplace outcome. Relationships of workplace appreciation factors with other measured variables including employee age, gender and workplace role were identified. The study findings provide both theoretical and practical contributions concerning the roles of and importance of supervisor appreciative behaviours manifest in the workplace. Supervisor acknowledgment is theorised to provide a foundation for developing a positive supervisor-employee relationship with trust conveyed over time to realise positive employee and organisational outcomes. Building on this, further studies are recommended to confirm this study’s results across a range of workplaces and for other national cultures.
- Description: Doctor of Philosophy
- Authors: Timmerman, Geoffrey
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Most would agree, people like to be appreciated for who they are and for the work they do. Yet, the process resulting in employees feeling appreciated is not well understood. Further, appreciation in the workplace is complex, when considering the concept’s multifaceted nature. Workplace-relevant research supports hypotheses that being appreciated at work is associated with desirable employee outcomes such as enhanced subjective well-being (SWB), higher levels of job satisfaction and performance, creativity while also benefiting organisations through higher employee productivity. Some authors even suggest that being appreciated links to physical well-being. Regardless, empirical evidence supporting a putative relationship between appreciation and key workplace outcomes (SWB, job satisfaction and happiness) is lacking; This represents a knowledge gap in the management literature. An important related question concerns optimal ways that managers can express appreciation to their employees at work, and conversely, employee preferences for the form of appreciation that they receive from their manager. Past studies investigating the influence of appreciation in the workplace, though informative, have failed to apply a rigorous process to identify forms of appreciative behaviour. To advance knowledge on forms of workplace appreciation endowed by supervisors, and how this may influence employees, the first study aim was to identify and appraise the underlying components of appreciation-type behaviours. Hence, the supervisor-employee relationship forms the central component for this study. The second study aim was to identify whether and how supervisor-enacted appreciative behaviours influence selected employee work outcomes. A review of literature pertinent to the research aims provided theoretical foundations for understanding appreciative behaviours in the workplace. These included social relationships, human motivation, workplace sources of support, dispositional versus behavioural approaches to appreciation, selected aspects of leadership and the theorised function of workplace appreciation. From this, a conceptual model of an iterative workplace appreciation cycle was proposed to support the study aims. To meet the research aims, a two-phase study approach was adopted. Firstly, a qualitative study investigated the construct of expressed appreciation (phase 1). Here, expressed supervisor appreciative behaviours were identified through 19 one-on-one, semi-structured interviews with employees from a variety of professions and employment sectors. Through a rigorous thematic analysis, five supervisor appreciative behavioural themes (Interest, Rewards, Acknowledgment, Trust and Endorsement) were established to determine what (forms of appreciative behaviours enacted by supervisors). This first thematic framework was complemented by three outcome-related themes (Cognisance, Confirmation and Commendation) capturing the why (with regard to why employees feel appreciated) as a second thematic framework. Phase 2 of the study employed an online quantitative survey directly informed by phase 1 results. The hypothetical what and why constructs forming workplace appreciative behaviours were each developed as itemised scales (20-item and 12-item, respectively). An online survey instrument gathered employee (N=206) responses for itemised scales plus workplace outcome scales measuring SWB, job satisfaction and job commitment. Factor analysis of the 20-item what scale identified workplace appreciation behaviours endowed by supervisors to comprise a three-factor structure (factors labelled acknowledgement, trust and reward). A 12-item scale representing why employees feel appreciated provided a one-factor solution. Subsequent multiple regressions revealed the factors of acknowledgement and trust to be associated (p<.05) with job satisfaction, job commitment and overall well-being. Reward was not associated with any measured employee workplace outcome. Relationships of workplace appreciation factors with other measured variables including employee age, gender and workplace role were identified. The study findings provide both theoretical and practical contributions concerning the roles of and importance of supervisor appreciative behaviours manifest in the workplace. Supervisor acknowledgment is theorised to provide a foundation for developing a positive supervisor-employee relationship with trust conveyed over time to realise positive employee and organisational outcomes. Building on this, further studies are recommended to confirm this study’s results across a range of workplaces and for other national cultures.
- Description: Doctor of Philosophy
The effect of swimming training load on supraspinatus tendon thickness and shoulder pain in elite swimmers
- Authors: Jabornik, Kirsten
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Swimming is one of the top three participant sports in Australia and enjoys a high public profile. Shoulder injuries are commonly sustained by swimmers and are associated with significant morbidity as well as impaired swimming performance. Supraspinatus tendinopathy has been found to be present in a large proportion of competitive swimmers. The use of ultrasound has been found to be a reliable and valid tool in assessing supraspinatus tendon thickness changes. Primarily this thesis investigated the relationship between changes in supraspinatus tendon thickness and shoulder pain among elite Australian swimmers. The thesis investigated how swimming practice load and intensity resulted in supraspinatus tendon thickness changes. Furthermore, retrospective data investigates the link between training related supraspinatus tendon thickness changes and future incidence of shoulder pain. The research ascertained that swimming practice results in significantly greater increases in supraspinatus tendon thickness in swimmer’s shoulders with a history of shoulder pain. The evaluation of volume and intensity demonstrated a greater increase in thickness as a result of high intensity low volume practice compared with that of high volume low intensity practice in swimmer’s shoulders without a history of pain. While retrospective data identified a significant association between the increase in tendon thickness immediately post a swimming practice and the tendon thickness at six hours post practice and the incidence of significant interfering shoulder pain at both three and six months post testing. These findings provide an evidence base for the use of supraspinatus tendon thickness measures to assess a swimmer’s readiness to train when returning from an episode of shoulder pain. Additionally, the shoulder tendon response to varying training loads, including different intensity and volume and how this may be associated with future incidence of pain may guide coaches and clinical staff in the planning of training programs and training periodisation to manage shoulder pain incidence
- Description: Doctor of Philosophy
- Authors: Jabornik, Kirsten
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Swimming is one of the top three participant sports in Australia and enjoys a high public profile. Shoulder injuries are commonly sustained by swimmers and are associated with significant morbidity as well as impaired swimming performance. Supraspinatus tendinopathy has been found to be present in a large proportion of competitive swimmers. The use of ultrasound has been found to be a reliable and valid tool in assessing supraspinatus tendon thickness changes. Primarily this thesis investigated the relationship between changes in supraspinatus tendon thickness and shoulder pain among elite Australian swimmers. The thesis investigated how swimming practice load and intensity resulted in supraspinatus tendon thickness changes. Furthermore, retrospective data investigates the link between training related supraspinatus tendon thickness changes and future incidence of shoulder pain. The research ascertained that swimming practice results in significantly greater increases in supraspinatus tendon thickness in swimmer’s shoulders with a history of shoulder pain. The evaluation of volume and intensity demonstrated a greater increase in thickness as a result of high intensity low volume practice compared with that of high volume low intensity practice in swimmer’s shoulders without a history of pain. While retrospective data identified a significant association between the increase in tendon thickness immediately post a swimming practice and the tendon thickness at six hours post practice and the incidence of significant interfering shoulder pain at both three and six months post testing. These findings provide an evidence base for the use of supraspinatus tendon thickness measures to assess a swimmer’s readiness to train when returning from an episode of shoulder pain. Additionally, the shoulder tendon response to varying training loads, including different intensity and volume and how this may be associated with future incidence of pain may guide coaches and clinical staff in the planning of training programs and training periodisation to manage shoulder pain incidence
- Description: Doctor of Philosophy
Towards robust convolutional neural networks in challenging environments
- Authors: Hossain, Md Tahmid
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Image classification is one of the fundamental tasks in the field of computer vision. Although Artificial Neural Network (ANN) showed a lot of promise in this field, the lack of efficient computer hardware subdued its potential to a great extent. In the early 2000s, advances in hardware coupled with better network design saw the dramatic rise of Convolutional Neural Network (CNN). Deep CNNs pushed the State-of-The-Art (SOTA) in a number of vision tasks, including image classification, object detection, and segmentation. Presently, CNNs dominate these tasks. Although CNNs exhibit impressive classification performance on clean images, they are vulnerable to distortions, such as noise and blur. Fine-tuning a pre-trained CNN on mutually exclusive or a union set of distortions is a brute-force solution. This iterative fine-tuning process with all known types of distortion is, however, exhaustive and the network struggles to handle unseen distortions. CNNs are also vulnerable to image translation or shift, partly due to common Down-Sampling (DS) layers, e.g., max-pooling and strided convolution. These operations violate the Nyquist sampling rate and cause aliasing. The textbook solution is low-pass filtering (blurring) before down-sampling, which can benefit deep networks as well. Even so, non-linearity units, such as ReLU, often re-introduce the problem, suggesting that blurring alone may not suffice. Another important but under-explored issue for CNNs is unknown or Open Set Recognition (OSR). CNNs are commonly designed for closed set arrangements, where test instances only belong to some ‘Known Known’ (KK) classes used in training. As such, they predict a class label for a test sample based on the distribution of the KK classes. However, when used under the OSR setup (where an input may belong to an ‘Unknown Unknown’ or UU class), such a network will always classify a test instance as one of the KK classes even if it is from a UU class. Historically, CNNs have struggled with detecting objects in images with large difference in scale, especially small objects. This is because the DS layers inside a CNN often progressively wipe out the signal from small objects. As a result, the final layers are left with no signature from these objects leading to degraded performance. In this work, we propose solutions to the above four problems. First, we improve CNN robustness against distortion by proposing DCT based augmentation, adaptive regularisation, and noise suppressing Activation Functions (AF). Second, to ensure further performance gain and robustness to image transformations, we introduce anti-aliasing properties inside the AF and propose a novel DS method called blurpool. Third, to address the OSR problem, we propose a novel training paradigm that ensures detection of UU classes and accurate classification of the KK classes. Finally, we introduce a novel CNN that enables a deep detector to identify small objects with high precision and recall. We evaluate our methods on a number of benchmark datasets and demonstrate that they outperform contemporary methods in the respective problem set-ups.
- Description: Doctor of Philosophy
- Authors: Hossain, Md Tahmid
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Image classification is one of the fundamental tasks in the field of computer vision. Although Artificial Neural Network (ANN) showed a lot of promise in this field, the lack of efficient computer hardware subdued its potential to a great extent. In the early 2000s, advances in hardware coupled with better network design saw the dramatic rise of Convolutional Neural Network (CNN). Deep CNNs pushed the State-of-The-Art (SOTA) in a number of vision tasks, including image classification, object detection, and segmentation. Presently, CNNs dominate these tasks. Although CNNs exhibit impressive classification performance on clean images, they are vulnerable to distortions, such as noise and blur. Fine-tuning a pre-trained CNN on mutually exclusive or a union set of distortions is a brute-force solution. This iterative fine-tuning process with all known types of distortion is, however, exhaustive and the network struggles to handle unseen distortions. CNNs are also vulnerable to image translation or shift, partly due to common Down-Sampling (DS) layers, e.g., max-pooling and strided convolution. These operations violate the Nyquist sampling rate and cause aliasing. The textbook solution is low-pass filtering (blurring) before down-sampling, which can benefit deep networks as well. Even so, non-linearity units, such as ReLU, often re-introduce the problem, suggesting that blurring alone may not suffice. Another important but under-explored issue for CNNs is unknown or Open Set Recognition (OSR). CNNs are commonly designed for closed set arrangements, where test instances only belong to some ‘Known Known’ (KK) classes used in training. As such, they predict a class label for a test sample based on the distribution of the KK classes. However, when used under the OSR setup (where an input may belong to an ‘Unknown Unknown’ or UU class), such a network will always classify a test instance as one of the KK classes even if it is from a UU class. Historically, CNNs have struggled with detecting objects in images with large difference in scale, especially small objects. This is because the DS layers inside a CNN often progressively wipe out the signal from small objects. As a result, the final layers are left with no signature from these objects leading to degraded performance. In this work, we propose solutions to the above four problems. First, we improve CNN robustness against distortion by proposing DCT based augmentation, adaptive regularisation, and noise suppressing Activation Functions (AF). Second, to ensure further performance gain and robustness to image transformations, we introduce anti-aliasing properties inside the AF and propose a novel DS method called blurpool. Third, to address the OSR problem, we propose a novel training paradigm that ensures detection of UU classes and accurate classification of the KK classes. Finally, we introduce a novel CNN that enables a deep detector to identify small objects with high precision and recall. We evaluate our methods on a number of benchmark datasets and demonstrate that they outperform contemporary methods in the respective problem set-ups.
- Description: Doctor of Philosophy
Transversality, regularity and error bounds in variational analysis and optimisation
- Authors: Nguyen, Duy
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Transversality properties of collections of sets, regularity properties of set-valued mappings, and error bounds of extended-real-valued functions lie at the core of variational analysis because of their importance for stability analysis, constraint qualifications, qualification conditions in coderivative and subdifferential calculus, and convergence analysis of numerical algorithms. The thesis is devoted to investigation of several research questions related to the aforementioned properties. We develop a general framework for quantitative analysis of nonlinear transversality properties by establishing primal and dual characterizations of the properties in both convex and nonconvex settings. The H¨older case is given special attention. Quantitative relations between transversality properties and the corresponding regularity properties of set-valued mappings as well as nonlinear extensions of the new transversality properties of a set-valued mapping to a set in the range space are also discussed. We study a new property so called semitransversality of collections of set-valued mappings on metric (in particular, normed) spaces. The property is a generalization of the semitransversality of collections of sets and the negation of the corresponding stationarity, a weaker property than the extremality of collections of set-valued mappings. Primal and dual characterizations of the property as well as quantitative relations between the property and semiregularity of set-valued mappings are formulated. As a consequence, we establish dual necessary and sufficient conditions for stationarity of collections of set-valued mappings as well as optimality conditions for efficient solutions with respect to variable ordering structures in multiobjective optimization. We examine a comprehensive (i.e. not assuming the mapping to have any particular structure) view on the regularity theory of set-valued mappings and clarify the relationships between the existing primal and dual quantitative sufficient and necessary conditions including their hierarchy. The typical sequence of regularity assertions, often hidden in the proofs, and the roles of the assumptions involved in the assertions, in particular, on the underlying space: general metric, normed, Banach or Asplund are exposed. As a consequence, we formulate primal and dual conditions for the stability properties of solution mappings to inclusions. We propose a unifying general framework of quantitative primal and dual sufficient and necessary error bound conditions covering linear and nonlinear, local and global settings. The function is not assumed to possess any particular structure apart from the standard assumptions of lower semicontinuity in the case of sufficient conditions and (in some cases) convexity in the case of necessary conditions. We expose the roles of the assumptions involved in the error bound assertions, in particular, on the underlying space: general metric, normed, Banach or Asplund. As a consequence, the error bound theory is applied to characterize subregularity of set-valued mappings, and calmness of the solution mapping in convex semi-infinite optimization problems.
- Description: Doctor of Philosophy
- Authors: Nguyen, Duy
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Transversality properties of collections of sets, regularity properties of set-valued mappings, and error bounds of extended-real-valued functions lie at the core of variational analysis because of their importance for stability analysis, constraint qualifications, qualification conditions in coderivative and subdifferential calculus, and convergence analysis of numerical algorithms. The thesis is devoted to investigation of several research questions related to the aforementioned properties. We develop a general framework for quantitative analysis of nonlinear transversality properties by establishing primal and dual characterizations of the properties in both convex and nonconvex settings. The H¨older case is given special attention. Quantitative relations between transversality properties and the corresponding regularity properties of set-valued mappings as well as nonlinear extensions of the new transversality properties of a set-valued mapping to a set in the range space are also discussed. We study a new property so called semitransversality of collections of set-valued mappings on metric (in particular, normed) spaces. The property is a generalization of the semitransversality of collections of sets and the negation of the corresponding stationarity, a weaker property than the extremality of collections of set-valued mappings. Primal and dual characterizations of the property as well as quantitative relations between the property and semiregularity of set-valued mappings are formulated. As a consequence, we establish dual necessary and sufficient conditions for stationarity of collections of set-valued mappings as well as optimality conditions for efficient solutions with respect to variable ordering structures in multiobjective optimization. We examine a comprehensive (i.e. not assuming the mapping to have any particular structure) view on the regularity theory of set-valued mappings and clarify the relationships between the existing primal and dual quantitative sufficient and necessary conditions including their hierarchy. The typical sequence of regularity assertions, often hidden in the proofs, and the roles of the assumptions involved in the assertions, in particular, on the underlying space: general metric, normed, Banach or Asplund are exposed. As a consequence, we formulate primal and dual conditions for the stability properties of solution mappings to inclusions. We propose a unifying general framework of quantitative primal and dual sufficient and necessary error bound conditions covering linear and nonlinear, local and global settings. The function is not assumed to possess any particular structure apart from the standard assumptions of lower semicontinuity in the case of sufficient conditions and (in some cases) convexity in the case of necessary conditions. We expose the roles of the assumptions involved in the error bound assertions, in particular, on the underlying space: general metric, normed, Banach or Asplund. As a consequence, the error bound theory is applied to characterize subregularity of set-valued mappings, and calmness of the solution mapping in convex semi-infinite optimization problems.
- Description: Doctor of Philosophy
True to nature? Fidelity and transformation in Eugene von Guérard’s antipodean landscape paintings
- Authors: Hook, George
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: When the leading mid-nineteenth-century landscape artist in Victoria, Eugene von Guérard, was criticised for failing to illustrate nature sublimely, he replied that his “greatest desire” was to “imitate nature” as far as it was “compatible with the effect of the picture.” Later, he asserted that his aim was “to be true to nature as far as possible” in his art. This empirical, science-informed thesis explores what being “true to nature” meant in Guérard’s practice by examining natural features typically illustrated with fidelity, scrutinising features freely transformed for artistic effect, and assessing whether such transformations compromise his aesthetic ideal. The fieldwork-based study addresses a knowledge gap in Australian art history and environmental history by adopting a multi-disciplinary approach. The findings make a significant contribution to understanding what being “true to nature” meant for Guérard, and to determining whether his landscapes are reliable environmental history records. The investigation uses a mixed-method approach, combining qualitative and quantitative techniques. Early in-depth case studies identified faithfully rendered and freely modified features, which informed the development of an innovative survey instrument used to evaluate the fidelity of over a hundred of Guérard’s Antipodean landscapes. The extent to which natural features are faithful or transformed is subjectively assessed by comparing them with his accurate field drawings and modern site photographs taken from his vantage points. The novel reverse use of digital elevation models enabled many of his vantage points at sites to be precisely determined. Statistical analysis of survey data and further case studies leads to the conclusion that Guérard practised selective fidelity to nature. Although no natural feature was totally immune to being modified for artistic effect, many features are typically reproduced with great fidelity to the natural scenery visible at the site. Features significantly altered to create visually engaging or dramatic landscapes are usually found to be true to the natural history of the location, if not necessarily to the view. Exceptions are largely restricted to the composite landscapes that field research uncovered. Finally, the thesis examines whether Guérard’s fidelity practice resonates with particular purported influences, or parallels the practices of international contemporaries who were also renowned for their wilderness paintings.
- Description: Doctor of Philosophy
- Authors: Hook, George
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: When the leading mid-nineteenth-century landscape artist in Victoria, Eugene von Guérard, was criticised for failing to illustrate nature sublimely, he replied that his “greatest desire” was to “imitate nature” as far as it was “compatible with the effect of the picture.” Later, he asserted that his aim was “to be true to nature as far as possible” in his art. This empirical, science-informed thesis explores what being “true to nature” meant in Guérard’s practice by examining natural features typically illustrated with fidelity, scrutinising features freely transformed for artistic effect, and assessing whether such transformations compromise his aesthetic ideal. The fieldwork-based study addresses a knowledge gap in Australian art history and environmental history by adopting a multi-disciplinary approach. The findings make a significant contribution to understanding what being “true to nature” meant for Guérard, and to determining whether his landscapes are reliable environmental history records. The investigation uses a mixed-method approach, combining qualitative and quantitative techniques. Early in-depth case studies identified faithfully rendered and freely modified features, which informed the development of an innovative survey instrument used to evaluate the fidelity of over a hundred of Guérard’s Antipodean landscapes. The extent to which natural features are faithful or transformed is subjectively assessed by comparing them with his accurate field drawings and modern site photographs taken from his vantage points. The novel reverse use of digital elevation models enabled many of his vantage points at sites to be precisely determined. Statistical analysis of survey data and further case studies leads to the conclusion that Guérard practised selective fidelity to nature. Although no natural feature was totally immune to being modified for artistic effect, many features are typically reproduced with great fidelity to the natural scenery visible at the site. Features significantly altered to create visually engaging or dramatic landscapes are usually found to be true to the natural history of the location, if not necessarily to the view. Exceptions are largely restricted to the composite landscapes that field research uncovered. Finally, the thesis examines whether Guérard’s fidelity practice resonates with particular purported influences, or parallels the practices of international contemporaries who were also renowned for their wilderness paintings.
- Description: Doctor of Philosophy
Virtual streetgames : a mixed methods study exploring the delivery of an online youth physical activity program
- Authors: Kemel, Paul
- Date: 2021
- Type: Text , Thesis , Masters
- Full Text:
- Description: Prior to the COVID-19 pandemic there was already considerable concern relating to the declining physical activity rates of adolescents and young adults seen across the world. The COVID-19 pandemic, along with the various corresponding social distancing and lockdown guidelines, has further exacerbated these concerns. The utilisation of various forms of technology to maintain and encourage a degree of social connectedness during these timeframes sparked a degree of creativity in how our usual ways of interacting could be modified to the unique social-political circumstances. One such example is the youth community physical activity program Latrobe Streetgames, who adapted their program to be delivered across a range of social media platforms. A mixed methods study was conducted to help understand the impact that the adapted online program had on its participants during the COVID-19 pandemic. The results of the study highlight the negative impact that the various COVID-19 lockdowns had on the target population, and while the ability to maintain some degree of social-physical intractability via the modified Latrobe Streetgames delivery was beneficial, it likely did not outweigh the negative impact of the lockdowns itself. Therefore, as the world moves pasts the pandemic, an emphasis needs to be placed on ensuring that youth physical activity is promoted in order to combat the acquired negative health effects relating to physical, mental and social health.
- Description: Masters by Research
- Authors: Kemel, Paul
- Date: 2021
- Type: Text , Thesis , Masters
- Full Text:
- Description: Prior to the COVID-19 pandemic there was already considerable concern relating to the declining physical activity rates of adolescents and young adults seen across the world. The COVID-19 pandemic, along with the various corresponding social distancing and lockdown guidelines, has further exacerbated these concerns. The utilisation of various forms of technology to maintain and encourage a degree of social connectedness during these timeframes sparked a degree of creativity in how our usual ways of interacting could be modified to the unique social-political circumstances. One such example is the youth community physical activity program Latrobe Streetgames, who adapted their program to be delivered across a range of social media platforms. A mixed methods study was conducted to help understand the impact that the adapted online program had on its participants during the COVID-19 pandemic. The results of the study highlight the negative impact that the various COVID-19 lockdowns had on the target population, and while the ability to maintain some degree of social-physical intractability via the modified Latrobe Streetgames delivery was beneficial, it likely did not outweigh the negative impact of the lockdowns itself. Therefore, as the world moves pasts the pandemic, an emphasis needs to be placed on ensuring that youth physical activity is promoted in order to combat the acquired negative health effects relating to physical, mental and social health.
- Description: Masters by Research
“I’ve got something to say and I need you to listen” : a photovoice study with women who have experienced family violence
- Authors: Hunt, Michelle
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Family violence is recognised as a significant social issue in Australia that is predominantly perpetrated by men against women in intimate partner relationships. Once only of concern to women and feminist activists, family violence is now part of mainstream public policy and community service provision. This research was conducted within an industry, community and university partnership to improve services for women and children who have experienced family violence in the Central Highlands region of Victoria. This research study used photovoice, a feminist participatory research method, to gather the insights and knowledge of some of these women from this region. The participants produced, selected and contextualised photographs to share their vision of “strong families, safe children” as well as providing their insights on what services needed to do to support this vision. Ten women participated in the study and collectively contributed 42 photographs and attended 15 individual interviews and four group workshops over a six-month period. Through their photographs and narratives, the participants detailed their experiences of services, including the systemic abuse of power and coercion that undermined their relationships with their children. The participants described feeling blamed and further victimised when their interactions with services replicated the coercive control that they had experienced in their intimate partner relationships. Systemic racial discrimination and violence further compounded service encounters described by the Aboriginal women who participated in the study. The participants advocated for the transformation of family violence policy and practice from one reliant on patriarchal and colonial knowledge to one grounded in feminist epistemologies and women’s experiential knowledge. Consistent with feminist epistemologies, this research study highlights the importance of relational understandings of family violence, a position that acknowledges the significance of women’s social context and family networks, as well as the interconnectedness of women’s and children’s safety and wellbeing. This research study has implications for the family violence service system grappling with the inclusion of lived experience as being more than voice but encompassing the positioning of women’s experiential knowledge (with all its emotion, complexity and subjectivity) at the heart of policy and practice.
- Description: Doctor of Philosophy
- Authors: Hunt, Michelle
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Family violence is recognised as a significant social issue in Australia that is predominantly perpetrated by men against women in intimate partner relationships. Once only of concern to women and feminist activists, family violence is now part of mainstream public policy and community service provision. This research was conducted within an industry, community and university partnership to improve services for women and children who have experienced family violence in the Central Highlands region of Victoria. This research study used photovoice, a feminist participatory research method, to gather the insights and knowledge of some of these women from this region. The participants produced, selected and contextualised photographs to share their vision of “strong families, safe children” as well as providing their insights on what services needed to do to support this vision. Ten women participated in the study and collectively contributed 42 photographs and attended 15 individual interviews and four group workshops over a six-month period. Through their photographs and narratives, the participants detailed their experiences of services, including the systemic abuse of power and coercion that undermined their relationships with their children. The participants described feeling blamed and further victimised when their interactions with services replicated the coercive control that they had experienced in their intimate partner relationships. Systemic racial discrimination and violence further compounded service encounters described by the Aboriginal women who participated in the study. The participants advocated for the transformation of family violence policy and practice from one reliant on patriarchal and colonial knowledge to one grounded in feminist epistemologies and women’s experiential knowledge. Consistent with feminist epistemologies, this research study highlights the importance of relational understandings of family violence, a position that acknowledges the significance of women’s social context and family networks, as well as the interconnectedness of women’s and children’s safety and wellbeing. This research study has implications for the family violence service system grappling with the inclusion of lived experience as being more than voice but encompassing the positioning of women’s experiential knowledge (with all its emotion, complexity and subjectivity) at the heart of policy and practice.
- Description: Doctor of Philosophy