Intelligent zero-day intrusion detection framework for internet of things
- Authors: Khraisat, Ansam
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Zero-day intrusion detection system faces serious challenges as hundreds of thousands of new instances of malware are being created every day to cause harm or damage to the computer system. Cyber-attacks are becoming more sophisticated, leading to challenges in intrusion detection. There are many Intrusion Detection Systems (IDSs), which are proposed to identify abnormal activities, but most of these IDSs produce a large number of false positives and low detection accuracy. Hence, a significant quantity of false positives could generate a high-level of alerts in a short period of time as the normal activities are classified as intrusion activities. This thesis proposes a novel framework of hybrid intrusion detection system that integrates the Signature Intrusion Detection System (SIDS) with the Anomaly Intrusion Detection System (AIDS) to detect zero-day attacks with high accuracy. SIDS has been used to identify previously known intrusions, and AIDS has been applied to detect unknown zero-day intrusions. The goal of this research is to combine the strengths of each technique toward the development of a hybrid framework for the efficient intrusion detection system. A number of performance measures including accuracy, F-measure and area under ROC curve have been used to evaluate the efficacy of our proposed models and to compare and contrast with existing approaches. Extensive simulation results conducted in this thesis show that the proposed framework is capable of yielding excellent detection performance when tested with a number of widely used benchmark datasets in the intrusion detection system domain. Experiments show that the proposed hybrid IDS provides higher detection rate and lower false-positive rate in detecting intrusions as compared to the SIDS and AIDS techniques individually.
- Description: Doctor of Philosophy
- Authors: Khraisat, Ansam
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Zero-day intrusion detection system faces serious challenges as hundreds of thousands of new instances of malware are being created every day to cause harm or damage to the computer system. Cyber-attacks are becoming more sophisticated, leading to challenges in intrusion detection. There are many Intrusion Detection Systems (IDSs), which are proposed to identify abnormal activities, but most of these IDSs produce a large number of false positives and low detection accuracy. Hence, a significant quantity of false positives could generate a high-level of alerts in a short period of time as the normal activities are classified as intrusion activities. This thesis proposes a novel framework of hybrid intrusion detection system that integrates the Signature Intrusion Detection System (SIDS) with the Anomaly Intrusion Detection System (AIDS) to detect zero-day attacks with high accuracy. SIDS has been used to identify previously known intrusions, and AIDS has been applied to detect unknown zero-day intrusions. The goal of this research is to combine the strengths of each technique toward the development of a hybrid framework for the efficient intrusion detection system. A number of performance measures including accuracy, F-measure and area under ROC curve have been used to evaluate the efficacy of our proposed models and to compare and contrast with existing approaches. Extensive simulation results conducted in this thesis show that the proposed framework is capable of yielding excellent detection performance when tested with a number of widely used benchmark datasets in the intrusion detection system domain. Experiments show that the proposed hybrid IDS provides higher detection rate and lower false-positive rate in detecting intrusions as compared to the SIDS and AIDS techniques individually.
- Description: Doctor of Philosophy
Never afters : female friendship and collaboration in contemporary re-visioned fairy tales by women
- Authors: McDermott, Kirstyn
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Antagonism among girls and women in fairy tales has been the subject of much critical and popular discussion over recent decades. Significantly less attention, however, has been paid to the frequent absence of collaborative female relationships in traditional fairy tales and their contemporary retellings. Holding re-visioned fairy tales to be a type of feminist creative praxis, this thesis investigates how mutually beneficial relationships between female characters may be constructed within such narratives. “Never Afters” is a collection of six re-visions, written as sequels to well-known fairy tales from the Western European corpus. Situated within a genre that commonly isolates female characters or foregrounds female antagonism, each re-vision employs one (or more) of five key strategies that are used by contemporary authors to imagine collaborative female relationships within retold fairy tales: inversion, insertion/deletion, expansion, fusion, and extrapolation. The exegesis contextualises my creative work and assesses the strengths and limitations of each strategy by critically examining how they are used in contemporary fairy tales by authors including Emma Donoghue, Theodora Goss, Angela Slatter, Aimee Bender, and Kelly Link. I demonstrate that expansion, fusion, and extrapolation best allow authors to introduce new female characters and fresh feminist perspectives that move away from female exceptionalism and instead foreground female collaboration and friendship as potent sources of narrative power. The exegesis further argues that the cognitive sciences, and schema theories in particular, may offer insights as to why collaborative female relationships have received such scant representation. Using case studies of my own creative praxis, I explore the ways in which female isolation and acrimony are re-inscribed in contemporary work and recommend the adoption of new frameworks through which creative writers may critically and reflexively interrogate their tacit storytelling knowledge.
- Description: Doctor of Philosophy
- Authors: McDermott, Kirstyn
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Antagonism among girls and women in fairy tales has been the subject of much critical and popular discussion over recent decades. Significantly less attention, however, has been paid to the frequent absence of collaborative female relationships in traditional fairy tales and their contemporary retellings. Holding re-visioned fairy tales to be a type of feminist creative praxis, this thesis investigates how mutually beneficial relationships between female characters may be constructed within such narratives. “Never Afters” is a collection of six re-visions, written as sequels to well-known fairy tales from the Western European corpus. Situated within a genre that commonly isolates female characters or foregrounds female antagonism, each re-vision employs one (or more) of five key strategies that are used by contemporary authors to imagine collaborative female relationships within retold fairy tales: inversion, insertion/deletion, expansion, fusion, and extrapolation. The exegesis contextualises my creative work and assesses the strengths and limitations of each strategy by critically examining how they are used in contemporary fairy tales by authors including Emma Donoghue, Theodora Goss, Angela Slatter, Aimee Bender, and Kelly Link. I demonstrate that expansion, fusion, and extrapolation best allow authors to introduce new female characters and fresh feminist perspectives that move away from female exceptionalism and instead foreground female collaboration and friendship as potent sources of narrative power. The exegesis further argues that the cognitive sciences, and schema theories in particular, may offer insights as to why collaborative female relationships have received such scant representation. Using case studies of my own creative praxis, I explore the ways in which female isolation and acrimony are re-inscribed in contemporary work and recommend the adoption of new frameworks through which creative writers may critically and reflexively interrogate their tacit storytelling knowledge.
- Description: Doctor of Philosophy
Abnormalities in T cell lineages from patients with Langerhans cell histiocytosis
- Authors: Mitchell, Jenée
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Langerhans cell histiocytosis (LCH) is a rare inflammatory disease characterised by lesions containing CD1a+ myeloid lineage ‘LCH’ cells. Other immune cells such as T cells are also present within LCH lesions and the cytokine milieu suggests T cell activation. T cells have an established role in regulating cellular immunity and there is already evidence that multiple T cell lineages are enriched in LCH lesions, implying that they may have a role in LCH pathogenesis. Foxp3+ regulatory T cells (Tregs) and the immune suppressive cytokine, transforming growth factor beta (TGF-
- Description: Doctor of Philosophy
- Authors: Mitchell, Jenée
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Langerhans cell histiocytosis (LCH) is a rare inflammatory disease characterised by lesions containing CD1a+ myeloid lineage ‘LCH’ cells. Other immune cells such as T cells are also present within LCH lesions and the cytokine milieu suggests T cell activation. T cells have an established role in regulating cellular immunity and there is already evidence that multiple T cell lineages are enriched in LCH lesions, implying that they may have a role in LCH pathogenesis. Foxp3+ regulatory T cells (Tregs) and the immune suppressive cytokine, transforming growth factor beta (TGF-
- Description: Doctor of Philosophy
Internationalisation of higher education curriculum : a case study in Vietnam
- Authors: Luong, Thi Phuong
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis investigated how the process of internationalisation of the curriculum (IoC) was perceived as taking place at a non-western university, namely Foreign Trade University (FTU) in Vietnam, through the development and offering of a number of jointly run programs, labelled Foreign Undergraduate Programs (FUPs). Two specific programs were examined, both of which were developed in partnership with two western universities – Colorado State University (FTU-CSU program) and London Metropolitan University (FTU-LMET program). These programs provide a range of opportunities for Vietnamese university students to experience an education that aims to reflect an international and therefore ‘broader’ context. The relationship between globalisation and internationalisation is explored and linked with the development of curriculum in higher education and internationalisation trends and strategies. Internationalisation of the curriculum, which is one of the internationalisation strategies employed by educational institutions, is investigated in terms of its interrelationship with student learning, the disciplines and academics. Engeström’s (2001) third generation Activity Theory was used as the theoretical lens for analysis of the data, which was collected via a mainly qualitative case study. Two cohorts of participants provided data through 24 interviews (seven including a joint one with program leaders/course coordinators, and 17 with academics) and 34 surveys completed by academics. The interviews/survey investigated participants’ perceptions about internationalisation and particularly IoC in relation to the two programs. Part of the significance of this study lies in the use of a number of conceptual and theoretical frameworks to extend the current body of literature beyond the main context of western higher education. An innovation in this study was the evaluation of the level of curriculum internationalisation at FTU, which was conducted using the model of curriculum internationalisation proposed by Huang (2017). Findings suggested that program managers and course coordinators worked collaboratively with their western partners to provide programs that they perceived as worthwhile in meeting the needs of the institution and the Vietnamese government agenda for internationalisation. However, academics were not generally well informed about the broader goals relating to IoC and found it challenging to accommodate the expectations with limited resources and lack of appropriate training.
- Description: Doctor of Philosophy
- Authors: Luong, Thi Phuong
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis investigated how the process of internationalisation of the curriculum (IoC) was perceived as taking place at a non-western university, namely Foreign Trade University (FTU) in Vietnam, through the development and offering of a number of jointly run programs, labelled Foreign Undergraduate Programs (FUPs). Two specific programs were examined, both of which were developed in partnership with two western universities – Colorado State University (FTU-CSU program) and London Metropolitan University (FTU-LMET program). These programs provide a range of opportunities for Vietnamese university students to experience an education that aims to reflect an international and therefore ‘broader’ context. The relationship between globalisation and internationalisation is explored and linked with the development of curriculum in higher education and internationalisation trends and strategies. Internationalisation of the curriculum, which is one of the internationalisation strategies employed by educational institutions, is investigated in terms of its interrelationship with student learning, the disciplines and academics. Engeström’s (2001) third generation Activity Theory was used as the theoretical lens for analysis of the data, which was collected via a mainly qualitative case study. Two cohorts of participants provided data through 24 interviews (seven including a joint one with program leaders/course coordinators, and 17 with academics) and 34 surveys completed by academics. The interviews/survey investigated participants’ perceptions about internationalisation and particularly IoC in relation to the two programs. Part of the significance of this study lies in the use of a number of conceptual and theoretical frameworks to extend the current body of literature beyond the main context of western higher education. An innovation in this study was the evaluation of the level of curriculum internationalisation at FTU, which was conducted using the model of curriculum internationalisation proposed by Huang (2017). Findings suggested that program managers and course coordinators worked collaboratively with their western partners to provide programs that they perceived as worthwhile in meeting the needs of the institution and the Vietnamese government agenda for internationalisation. However, academics were not generally well informed about the broader goals relating to IoC and found it challenging to accommodate the expectations with limited resources and lack of appropriate training.
- Description: Doctor of Philosophy
Deriving value from health 2.0 : A study of social media use among healthcare providers
- Authors: Ukoha, Chukwuma
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Social media applications are increasingly being used by healthcare providers because of the numerous communication, information, and public relations benefits they offer. Despite the growing adoption of social media in healthcare settings, its specific uses and value propositions are not well understood. To ensure continuous improvement, social media performance must be measured. However, little is known about the tools, techniques and yardsticks used to measure social media performance in healthcare settings. This study adopts qualitative research methods to explore healthcare providers’ perspectives on the value of social media in healthcare settings. Australian healthcare providers, from organizations of different sizes and locations, who use social media, were interviewed and the transcripts thematically analysed. The results demonstrate the uses of social media in health care, as well as the steps and techniques in social media measurement. Based on the findings, it is clear that the ability of social media to support various activities in healthcare settings makes it valuable to healthcare providers. Drawing on Bakhtin’s ‘theories’ and Stevens’s theory of measurement, this study theorises on the value of social media and introduces a protocol for measuring social media performance in healthcare settings. As one of the first studies to apply Bakhtinian ideas to consumer health informatics, this study has the potential to pave a new approach to conceptualizing the role of social media, particularly in healthcare settings. By using Stevens’s theory of measurement to explore the yardsticks suitable for social media measurement, this study provides a more nuanced framework for measuring the value of social media in healthcare settings.
- Description: Doctor of Philosophy
- Authors: Ukoha, Chukwuma
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Social media applications are increasingly being used by healthcare providers because of the numerous communication, information, and public relations benefits they offer. Despite the growing adoption of social media in healthcare settings, its specific uses and value propositions are not well understood. To ensure continuous improvement, social media performance must be measured. However, little is known about the tools, techniques and yardsticks used to measure social media performance in healthcare settings. This study adopts qualitative research methods to explore healthcare providers’ perspectives on the value of social media in healthcare settings. Australian healthcare providers, from organizations of different sizes and locations, who use social media, were interviewed and the transcripts thematically analysed. The results demonstrate the uses of social media in health care, as well as the steps and techniques in social media measurement. Based on the findings, it is clear that the ability of social media to support various activities in healthcare settings makes it valuable to healthcare providers. Drawing on Bakhtin’s ‘theories’ and Stevens’s theory of measurement, this study theorises on the value of social media and introduces a protocol for measuring social media performance in healthcare settings. As one of the first studies to apply Bakhtinian ideas to consumer health informatics, this study has the potential to pave a new approach to conceptualizing the role of social media, particularly in healthcare settings. By using Stevens’s theory of measurement to explore the yardsticks suitable for social media measurement, this study provides a more nuanced framework for measuring the value of social media in healthcare settings.
- Description: Doctor of Philosophy
Imbalanced data classification and its application in cyber security
- Authors: Moniruzzaman, Md
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Cyber security, also known as information technology security or simply as information security, aims to protect government organizations, companies and individuals by defending their computers, servers, electronic systems, networks, and data from malicious attacks. With the advancement of client-side on the fly web content generation techniques, it becomes easier for attackers to modify the content of a website dynamically and gain access to valuable information. The impact of cybercrime to the global economy is now more than ever, and it is growing day by day. Among various types of cybercrimes, financial attacks are widely spread and the financial sector is among most targeted. Both corporations and individuals are losing a huge amount of money each year. The majority portion of financial attacks is carried out by banking malware and web-based attacks. The end users are not always skilled enough to differentiate between injected content and actual contents of a webpage. Designing a real-time security system for ensuring a safe browsing experience is a challenging task. Some of the existing solutions are designed for client side and all the users have to install it in their system, which is very difficult to implement. In addition, various platforms and tools are used by organizations and individuals, therefore, different solutions are needed to be designed. The existing server-side solution often focuses on sanitizing and filtering the inputs. It will fail to detect obfuscated and hidden scripts. This is a realtime security system and any significant delay will hamper user experience. Therefore, finding the most optimized and efficient solution is very important. To ensure an easy installation and integration capabilities of any solution with the existing system is also a critical factor to consider. If the solution is efficient but difficult to integrate, then it may not be a feasible solution for practical use. Unsupervised and supervised data classification techniques have been widely applied to design algorithms for solving cyber security problems. The performance of these algorithms varies depending on types of cyber security problems and size of datasets. To date, existing algorithms do not achieve high accuracy in detecting malware activities. Datasets in cyber security and, especially those from financial sectors, are predominantly imbalanced datasets as the number of malware activities is significantly less than the number of normal activities. This means that classifiers for imbalanced datasets can be used to develop supervised data classification algorithms to detect malware activities. Development of classifiers for imbalanced data sets has been subject of research over the last decade. Most of these classifiers are based on oversampling and undersampling techniques and are not efficient in many situations as such techniques are applied globally. In this thesis, we develop two new algorithms for solving supervised data classification problems in imbalanced datasets and then apply them to solve malware detection problems. The first algorithm is designed using the piecewise linear classifiers by formulating this problem as an optimization problem and by applying the penalty function method. More specifically, we add more penalty to the objective function for misclassified points from minority classes. The second method is based on the combination of the supervised and unsupervised (clustering) algorithms. Such an approach allows one to identify areas in the input space where minority classes are located and to apply local oversampling or undersampling. This approach leads to the design of more efficient and accurate classifiers. The proposed algorithms are tested using real-world datasets. Results clearly demonstrate superiority of newly introduced algorithms. Then we apply these algorithms to design classifiers to detect malwares.
- Description: Doctor of Philosophy
- Authors: Moniruzzaman, Md
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Cyber security, also known as information technology security or simply as information security, aims to protect government organizations, companies and individuals by defending their computers, servers, electronic systems, networks, and data from malicious attacks. With the advancement of client-side on the fly web content generation techniques, it becomes easier for attackers to modify the content of a website dynamically and gain access to valuable information. The impact of cybercrime to the global economy is now more than ever, and it is growing day by day. Among various types of cybercrimes, financial attacks are widely spread and the financial sector is among most targeted. Both corporations and individuals are losing a huge amount of money each year. The majority portion of financial attacks is carried out by banking malware and web-based attacks. The end users are not always skilled enough to differentiate between injected content and actual contents of a webpage. Designing a real-time security system for ensuring a safe browsing experience is a challenging task. Some of the existing solutions are designed for client side and all the users have to install it in their system, which is very difficult to implement. In addition, various platforms and tools are used by organizations and individuals, therefore, different solutions are needed to be designed. The existing server-side solution often focuses on sanitizing and filtering the inputs. It will fail to detect obfuscated and hidden scripts. This is a realtime security system and any significant delay will hamper user experience. Therefore, finding the most optimized and efficient solution is very important. To ensure an easy installation and integration capabilities of any solution with the existing system is also a critical factor to consider. If the solution is efficient but difficult to integrate, then it may not be a feasible solution for practical use. Unsupervised and supervised data classification techniques have been widely applied to design algorithms for solving cyber security problems. The performance of these algorithms varies depending on types of cyber security problems and size of datasets. To date, existing algorithms do not achieve high accuracy in detecting malware activities. Datasets in cyber security and, especially those from financial sectors, are predominantly imbalanced datasets as the number of malware activities is significantly less than the number of normal activities. This means that classifiers for imbalanced datasets can be used to develop supervised data classification algorithms to detect malware activities. Development of classifiers for imbalanced data sets has been subject of research over the last decade. Most of these classifiers are based on oversampling and undersampling techniques and are not efficient in many situations as such techniques are applied globally. In this thesis, we develop two new algorithms for solving supervised data classification problems in imbalanced datasets and then apply them to solve malware detection problems. The first algorithm is designed using the piecewise linear classifiers by formulating this problem as an optimization problem and by applying the penalty function method. More specifically, we add more penalty to the objective function for misclassified points from minority classes. The second method is based on the combination of the supervised and unsupervised (clustering) algorithms. Such an approach allows one to identify areas in the input space where minority classes are located and to apply local oversampling or undersampling. This approach leads to the design of more efficient and accurate classifiers. The proposed algorithms are tested using real-world datasets. Results clearly demonstrate superiority of newly introduced algorithms. Then we apply these algorithms to design classifiers to detect malwares.
- 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
Approaches to learning : perceptions about Chinese international undergraduates in Australian Universities
- Li, Boli
- Authors: Li, Boli
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Chinese students constitute the largest cohort of international undergraduates in Australian universities, comprising 37.3% in 2019. However, there is a scarcity of research examining perceptions of how Chinese international students (CIS) learn in Australian universities, from the broader context of the students themselves, their Australian teachers and Australian domestic student (ADS) counterparts. Drawing on the 3P (Presage-Process-Product) framework by Biggs, Kember, and Leung (2001), this thesis explored the perceptions of CIS, and their lecturers and classmates regarding their approaches to learning in Australian universities. Utilising a mixed methods approach (Creswell, 2014), surveys were conducted with 156 CIS and 212 ADS incorporating a validated survey by Biggs et al. (2001) called the R-SPQ-2F. Interviews were also conducted with 10 CIS and 10 Australian academics from two Australian universities, one regional and the other metropolitan. The findings demonstrated that perceptions of CIS were characterised by a unique learning structure that differed from ADS in a number of ways, particularly in relation to group learning, the use of understanding and memorisation strategies, and classroom engagement. It was noted that these disparities did not support the generally held view of CIS as mainly surface oriented learners who preferred rote-learning techniques (Grimshaw, 2007). While adopting similar levels to ADS of deep approach strategies in their learning, CIS also used more surface and achieving approaches than ADS, and tended to incorporate memorising with understanding in their learning process. However, it was also evident that the approaches used by CIS in Australia were often more complex than what was easily observed. For instance, their reticence in class was not necessarily indicative of passive learning, but instead, suggestive of the complexity of context that needs to encompass the ‘whole being’ of these students, i.e., their personality, culture, and most of all, the dynamics of their perceived approaches to their learning. This study also investigated negotiations that occurred between CIS and their Australian lecturers. While CIS’ learning approaches were greatly shaped and determined by academics’ instructional decisions involving curriculum, teaching patterns and assessment procedures, it was also found that academics’ instructional activities were reshaped and counter-determined by CIS’ learning approaches. As a result, a Co-constructed Model of Learning and Teaching (CMLT) for CIS in Australian universities, based on the 3P framework (Biggs et al., 2001), was developed to assist future education experiences for international students. This study is significant in that it has given voice to Chinese students, enabling a greater understanding of their experiences in Australian universities to emerge, in conjunction with and supplemented by insights provided by their Australian student counterparts and educators. It has enabled both international and domestic students the opportunity to reflect on possible cultural impacts on learning, hopefully improving their capacities to act as effective global citizens. It has also afforded an opportunity for academics to reflect on their beliefs and practices in relation to teaching diverse student cohorts, which will hopefully deepen their understanding of the complexities that come with the increasing globalisation of education.
- Description: Doctor of Philosophy
- Authors: Li, Boli
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Chinese students constitute the largest cohort of international undergraduates in Australian universities, comprising 37.3% in 2019. However, there is a scarcity of research examining perceptions of how Chinese international students (CIS) learn in Australian universities, from the broader context of the students themselves, their Australian teachers and Australian domestic student (ADS) counterparts. Drawing on the 3P (Presage-Process-Product) framework by Biggs, Kember, and Leung (2001), this thesis explored the perceptions of CIS, and their lecturers and classmates regarding their approaches to learning in Australian universities. Utilising a mixed methods approach (Creswell, 2014), surveys were conducted with 156 CIS and 212 ADS incorporating a validated survey by Biggs et al. (2001) called the R-SPQ-2F. Interviews were also conducted with 10 CIS and 10 Australian academics from two Australian universities, one regional and the other metropolitan. The findings demonstrated that perceptions of CIS were characterised by a unique learning structure that differed from ADS in a number of ways, particularly in relation to group learning, the use of understanding and memorisation strategies, and classroom engagement. It was noted that these disparities did not support the generally held view of CIS as mainly surface oriented learners who preferred rote-learning techniques (Grimshaw, 2007). While adopting similar levels to ADS of deep approach strategies in their learning, CIS also used more surface and achieving approaches than ADS, and tended to incorporate memorising with understanding in their learning process. However, it was also evident that the approaches used by CIS in Australia were often more complex than what was easily observed. For instance, their reticence in class was not necessarily indicative of passive learning, but instead, suggestive of the complexity of context that needs to encompass the ‘whole being’ of these students, i.e., their personality, culture, and most of all, the dynamics of their perceived approaches to their learning. This study also investigated negotiations that occurred between CIS and their Australian lecturers. While CIS’ learning approaches were greatly shaped and determined by academics’ instructional decisions involving curriculum, teaching patterns and assessment procedures, it was also found that academics’ instructional activities were reshaped and counter-determined by CIS’ learning approaches. As a result, a Co-constructed Model of Learning and Teaching (CMLT) for CIS in Australian universities, based on the 3P framework (Biggs et al., 2001), was developed to assist future education experiences for international students. This study is significant in that it has given voice to Chinese students, enabling a greater understanding of their experiences in Australian universities to emerge, in conjunction with and supplemented by insights provided by their Australian student counterparts and educators. It has enabled both international and domestic students the opportunity to reflect on possible cultural impacts on learning, hopefully improving their capacities to act as effective global citizens. It has also afforded an opportunity for academics to reflect on their beliefs and practices in relation to teaching diverse student cohorts, which will hopefully deepen their understanding of the complexities that come with the increasing globalisation of education.
- Description: Doctor of Philosophy
Agoraphilic navigation algorithm in dynamic environment
- Authors: Hewawasam, Hasitha
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis presents a novel Agoraphilic (free space attraction [FSA])-based navigation algorithm. This new algorithm is capable of undertaking local path planning for robot navigation in static and dynamic environments with the presence of a moving goal. The proposed algorithm eliminates the common weaknesses of the existing navigation approaches when operating in unknown dynamic environments while using the modified Agoraphilic concept. The Agoraphilic Navigation Algorithm in Dynamic Environment (ANADE) presented in this thesis does not look for obstacles (problems) to avoid; rather, it looks for free space (solutions) to follow. Therefore, this algorithm is also a human-like optimistic navigation algorithm. The proposed algorithm creates a set of Free Space Forces (FSFs) based on the current and future growing free space around the robot. These Free Space Forces are focused towards the current and future locations of a moving goal and finally generate a single attractive force. This attractive force pulls the robot through current free space towards the future growing free space leading to the goal. The new free space concept allows the ANADE to overcome many common problems of navigation algorithms. Several versions of the ANADE have been developed throughout this research to overcome the main limitation of the original Agoraphilic algorithm and address the common weaknesses of the existing navigation approaches. The ANADE I uses an object tracking method to identify the states (locations) of moving objects accurately. The ANADE II uses a dynamic obstacle prediction methodology to identify the robot’s future environments. In the ANADE III, a novel controller based on fuzzy logic was developed and combined with the new FSA concept to provide optimal navigational solutions at a low computational cost. In the ANADE III, the effectiveness of the ANADE II was further improved by incorporating the velocity vectors of the moving objects into decision-making. In the ANADE IV, a self-tuning system was successfully applied to the ANADE III to take advantage of the performances of free space attraction-based navigation algorithms. The proposed final version of the algorithm (ANADE V) comprises nine main modules. These modules are repeatedly used to create the robot’s driving force, which pulls the robot towards the goal (moving or static). An obstacle tracking module is used to identify the time-varying free spaces by tracking the moving objects. Further, a tracking system is also used to track the moving goal. The capacity of the ANADE was strengthened further by obstacle and goal path prediction modules. Future location prediction allowed the algorithm to make decisions by considering future environments around the robot. This is further supported by a self-tuning, machine learning–based controller designed to efficiently account for the inherent high uncertainties in the robot’s operational environment at a reduced computational cost. Experimental and simulation-based tests were conducted under dynamic environments to validate the algorithm. Further, the ANADE was benchmarked against other recently developed navigation algorithms. Those tests were focused on the behaviour of the algorithm under challenging environments with moving and static obstacles and goals. Further, the test results demonstrate that the ANADE is successful in navigating robots under unknown, dynamically cluttered environments.
- Description: Doctor of Philosophy
- Authors: Hewawasam, Hasitha
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis presents a novel Agoraphilic (free space attraction [FSA])-based navigation algorithm. This new algorithm is capable of undertaking local path planning for robot navigation in static and dynamic environments with the presence of a moving goal. The proposed algorithm eliminates the common weaknesses of the existing navigation approaches when operating in unknown dynamic environments while using the modified Agoraphilic concept. The Agoraphilic Navigation Algorithm in Dynamic Environment (ANADE) presented in this thesis does not look for obstacles (problems) to avoid; rather, it looks for free space (solutions) to follow. Therefore, this algorithm is also a human-like optimistic navigation algorithm. The proposed algorithm creates a set of Free Space Forces (FSFs) based on the current and future growing free space around the robot. These Free Space Forces are focused towards the current and future locations of a moving goal and finally generate a single attractive force. This attractive force pulls the robot through current free space towards the future growing free space leading to the goal. The new free space concept allows the ANADE to overcome many common problems of navigation algorithms. Several versions of the ANADE have been developed throughout this research to overcome the main limitation of the original Agoraphilic algorithm and address the common weaknesses of the existing navigation approaches. The ANADE I uses an object tracking method to identify the states (locations) of moving objects accurately. The ANADE II uses a dynamic obstacle prediction methodology to identify the robot’s future environments. In the ANADE III, a novel controller based on fuzzy logic was developed and combined with the new FSA concept to provide optimal navigational solutions at a low computational cost. In the ANADE III, the effectiveness of the ANADE II was further improved by incorporating the velocity vectors of the moving objects into decision-making. In the ANADE IV, a self-tuning system was successfully applied to the ANADE III to take advantage of the performances of free space attraction-based navigation algorithms. The proposed final version of the algorithm (ANADE V) comprises nine main modules. These modules are repeatedly used to create the robot’s driving force, which pulls the robot towards the goal (moving or static). An obstacle tracking module is used to identify the time-varying free spaces by tracking the moving objects. Further, a tracking system is also used to track the moving goal. The capacity of the ANADE was strengthened further by obstacle and goal path prediction modules. Future location prediction allowed the algorithm to make decisions by considering future environments around the robot. This is further supported by a self-tuning, machine learning–based controller designed to efficiently account for the inherent high uncertainties in the robot’s operational environment at a reduced computational cost. Experimental and simulation-based tests were conducted under dynamic environments to validate the algorithm. Further, the ANADE was benchmarked against other recently developed navigation algorithms. Those tests were focused on the behaviour of the algorithm under challenging environments with moving and static obstacles and goals. Further, the test results demonstrate that the ANADE is successful in navigating robots under unknown, dynamically cluttered environments.
- Description: Doctor of Philosophy
Assessment of horizontal bore drains performance in brown coal mines in the Latrobe Valley
- Authors: Perdigao, Cristhiana
- Date: 2021
- Type: Text , Thesis , Masters
- Full Text:
- Description: Horizontal bores are essential infrastructures for maintaining the stability of open-pit mine batters. The infiltration of water from large surface catchments during rain events and induced deformation caused by mining activities can cause the build-up of pore water pressures in mine batters, potentially leading to catastrophic slope failures. A field investigation unit containing a camera has been developed to survey long (>300m) horizontal bores. Features observed using the camera along the profile of horizontal bores are discussed. Water flow was quantified by flow meters. X-Ray Diffraction (XRD) was undertaken to investigate the water precipitates within the selected bores. Water flow temperature was recorded to test the hypothesis of a possibility to indicate whether a borehole was draining from the saturated zone or from the surface water through its temperature. The investigations have been conducted to determine the cause of change in the efficiency of horizontal boreholes and find a reliable measure to assess longevity and performance of horizontal drains. Bore efficiency has been defined as the bore functioning as a preferential path for water within the batter to be drained out to reduce the saturated zone and associated pore water pressures within the batter. The results suggest blockages and fractures inside the bores can be considered the leading cause of the change in the efficiency of a bore. Blockages occur because of sediment accumulation and because of coal chunks from internal wall collapses. Internal fractures affect efficiency when they become the water preferred path; thus, retaining water flowing within the batter. The bore’s longevity is considered the period of the bore is considered effective. Water flow measurement is suggested as a reliable measure to assess bores’ longevity.
- Description: Masters by Research
- Authors: Perdigao, Cristhiana
- Date: 2021
- Type: Text , Thesis , Masters
- Full Text:
- Description: Horizontal bores are essential infrastructures for maintaining the stability of open-pit mine batters. The infiltration of water from large surface catchments during rain events and induced deformation caused by mining activities can cause the build-up of pore water pressures in mine batters, potentially leading to catastrophic slope failures. A field investigation unit containing a camera has been developed to survey long (>300m) horizontal bores. Features observed using the camera along the profile of horizontal bores are discussed. Water flow was quantified by flow meters. X-Ray Diffraction (XRD) was undertaken to investigate the water precipitates within the selected bores. Water flow temperature was recorded to test the hypothesis of a possibility to indicate whether a borehole was draining from the saturated zone or from the surface water through its temperature. The investigations have been conducted to determine the cause of change in the efficiency of horizontal boreholes and find a reliable measure to assess longevity and performance of horizontal drains. Bore efficiency has been defined as the bore functioning as a preferential path for water within the batter to be drained out to reduce the saturated zone and associated pore water pressures within the batter. The results suggest blockages and fractures inside the bores can be considered the leading cause of the change in the efficiency of a bore. Blockages occur because of sediment accumulation and because of coal chunks from internal wall collapses. Internal fractures affect efficiency when they become the water preferred path; thus, retaining water flowing within the batter. The bore’s longevity is considered the period of the bore is considered effective. Water flow measurement is suggested as a reliable measure to assess bores’ longevity.
- Description: Masters by Research
Tracing farmers' exploitation, alienation and agency through technology
- Authors: Latham, Amity
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Grain growers are caught in a system of production which is characterised by the privatisation of the farm services sector, global trade, machinery automation, and technologies. The commodity chain is structured so that costs are passed on to farmers through what they buy and sell. As a consequence of this structure, farmers are exploited and subject to the condition of alienation. Previous research has revealed the challenges of farm-scale efficiencies and the demise of rural areas due to farmer-exodus. Since Kautsky’s original publication of The Agrarian Question in 1899, there is still limited material offering a new sociological understanding of farming and the humanistic effects of farm trade. Therefore, this doctoral study is about farmer-exploitation, alienation, and agency, together with the role of political economy, and the function of the commodity chain. It draws upon historical works from labour theorists to seek a better understanding of the humanism of work and participation in commerce in reference to the relations and networks that exist through farming. To trace farmers and their operations, this research uses actor network theory by deploying some of the methods that sit within this approach. Reflexive photography creates a hybrid method with digital images supporting the findings. The photographs in this thesis help to transport the reader to the research setting that is family operated grain growing farms. The key findings are that agency is a property of farmers, land and their machinery. It was found that technology and science facilitated farmer-agency to re-arrange humans and non-humans to hold science stable on farm through strong networks. Technology is responsible for facilitating farmer-agency, which is used as a tool and then it becomes a force, to exert control over farm production. This thesis makes a significant contribution in understanding modern farmer exploitation and how farmers can work to overcome their vulnerability in socio-political economy. This research is place-specific in the dryland agricultural zone of the Wimmera Southern Mallee region of Victoria, but it contributes to a global understanding of what makes farmers act.
- Description: Doctor of Philosophy
- Authors: Latham, Amity
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Grain growers are caught in a system of production which is characterised by the privatisation of the farm services sector, global trade, machinery automation, and technologies. The commodity chain is structured so that costs are passed on to farmers through what they buy and sell. As a consequence of this structure, farmers are exploited and subject to the condition of alienation. Previous research has revealed the challenges of farm-scale efficiencies and the demise of rural areas due to farmer-exodus. Since Kautsky’s original publication of The Agrarian Question in 1899, there is still limited material offering a new sociological understanding of farming and the humanistic effects of farm trade. Therefore, this doctoral study is about farmer-exploitation, alienation, and agency, together with the role of political economy, and the function of the commodity chain. It draws upon historical works from labour theorists to seek a better understanding of the humanism of work and participation in commerce in reference to the relations and networks that exist through farming. To trace farmers and their operations, this research uses actor network theory by deploying some of the methods that sit within this approach. Reflexive photography creates a hybrid method with digital images supporting the findings. The photographs in this thesis help to transport the reader to the research setting that is family operated grain growing farms. The key findings are that agency is a property of farmers, land and their machinery. It was found that technology and science facilitated farmer-agency to re-arrange humans and non-humans to hold science stable on farm through strong networks. Technology is responsible for facilitating farmer-agency, which is used as a tool and then it becomes a force, to exert control over farm production. This thesis makes a significant contribution in understanding modern farmer exploitation and how farmers can work to overcome their vulnerability in socio-political economy. This research is place-specific in the dryland agricultural zone of the Wimmera Southern Mallee region of Victoria, but it contributes to a global understanding of what makes farmers act.
- Description: Doctor of Philosophy
The regional trifecta: Entrepreneurs, managers and community leaders - an Ethnographic typology of leaders collaborating in a Regional Vicrorian Community
- Authors: Isham, Amy
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: This doctoral thesis explores a socioeconomic model for understanding and analysing leadership in the regional area of Horsham and its hinterland communities. This thesis critiques accepted models of regional development policy and leadership theory and in doing so argues for a new approach emphasising the roles that leaders adopt to achieve goals. These roles comprise the entrepreneur, manager and community leader that this thesis terms the regional trifecta model of leadership. This is a model that explores the ways that leaders attain mutuality within social and economic eco-systems in order to achieve long-term regional economic sustainability and liveability for residents. This doctoral study uses a critical qualitative ethnographic exploration of Horsham and its surrounding region drawing on researcher, the informant participant’s observations from a wide range of industries and social backgrounds. This thesis discusses themes of policy barriers to environmentally sustainable entrepreneurship, social ostracism of female leaders, a sense of futility in bureaucratic compliance, passive and unsupportive communities, tempered with the critical hope of social enterprise and potential partnerships. In examining these themes the thesis argues that entrepreneurs are overwhelmingly values driven. It also asserts that they experience barriers of unreliable labour and unsupportive external partnerships. Managers are also strongly values driven and can experience many barriers from internal partnerships within their own organisations. Community leaders are values driven and struggle against the barriers of bureaucracy with the organisations they partner with. The thesis provides a new contribution to the literature. This includes a critique of psycho-social approaches to leadership through role-based explorations that emphasise a collective responsibility for success within an eco-system. It also examines the types of people that become leaders and their motivations in regional Victoria. From this emerges a discussion about the tension between formal governance and power structures and the informal agency of leaders. The recommendations that emerge from this research are that policy-makers, local, state and federal governments acknowledge and support the role of existing informal leaders and the significant social and economic benefit they bring to regional Victoria.
- Description: Doctor of Philosophy
- Authors: Isham, Amy
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: This doctoral thesis explores a socioeconomic model for understanding and analysing leadership in the regional area of Horsham and its hinterland communities. This thesis critiques accepted models of regional development policy and leadership theory and in doing so argues for a new approach emphasising the roles that leaders adopt to achieve goals. These roles comprise the entrepreneur, manager and community leader that this thesis terms the regional trifecta model of leadership. This is a model that explores the ways that leaders attain mutuality within social and economic eco-systems in order to achieve long-term regional economic sustainability and liveability for residents. This doctoral study uses a critical qualitative ethnographic exploration of Horsham and its surrounding region drawing on researcher, the informant participant’s observations from a wide range of industries and social backgrounds. This thesis discusses themes of policy barriers to environmentally sustainable entrepreneurship, social ostracism of female leaders, a sense of futility in bureaucratic compliance, passive and unsupportive communities, tempered with the critical hope of social enterprise and potential partnerships. In examining these themes the thesis argues that entrepreneurs are overwhelmingly values driven. It also asserts that they experience barriers of unreliable labour and unsupportive external partnerships. Managers are also strongly values driven and can experience many barriers from internal partnerships within their own organisations. Community leaders are values driven and struggle against the barriers of bureaucracy with the organisations they partner with. The thesis provides a new contribution to the literature. This includes a critique of psycho-social approaches to leadership through role-based explorations that emphasise a collective responsibility for success within an eco-system. It also examines the types of people that become leaders and their motivations in regional Victoria. From this emerges a discussion about the tension between formal governance and power structures and the informal agency of leaders. The recommendations that emerge from this research are that policy-makers, local, state and federal governments acknowledge and support the role of existing informal leaders and the significant social and economic benefit they bring to regional Victoria.
- Description: Doctor of Philosophy
Under the influence : identifying determinants of young adults' involvement in alcohol-influenced aquatic activity to improve drowning prevention efforts
- Authors: Calverley, Hannah
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: BACKGROUND: Young adults are an at-risk group for experiencing an alcohol-related drowning incident. Investigations and drowning prevention efforts have aimed to address young adults’ prevalence in alcohol-related drownings and contribute to understanding their level of risk. Some explanations have concluded young adults’ need for autonomy and independence coincides with their exposure to alcohol and social norm pressures. However, gaps in knowledge remain, specifically young adults’: behaviours, knowledge and attitudes towards alcohol-influenced aquatic activity and the associated risks; and, their awareness and perceptions of alcohol-themed drowning prevention campaigns. METHODS: This PhD, completed with publications, aimed to address these gaps through four interlinked projects: (i) a systematic review of alcohol education programs to determine evidence-based quality criteria necessary for inclusion in programs to successfully change young adults’ alcohol-related behaviours, knowledge and attitudes; (ii) a program audit of alcohol-themed drowning prevention campaigns to establish current prevention efforts in high-income countries and areas for improvement; (iii) a survey among young adults from Australia and the United Kingdom to establish their knowledge, attitudes and predictors of intentions and involvement in alcohol-influenced aquatic activities; and, (iv) interviews to deepen understanding of young adults’ knowledge, attitudes and behaviours relating to alcohol-influenced aquatic activity, their awareness of alcohol-themed drowning prevention campaigns and their suggestions for improvement. Six publications resulted from this research. RESULTS: Friends influenced frequency of young adults’ involvement in alcohol-influenced aquatic activity, but involvement was dependent on the characteristics of the peer group, self-confidence and risk disassociation. Attitudes were neutral towards alcohol-influenced aquatic activity, but when participants perceived personal control over the risks it was deemed more acceptable. Alcohol-related safety strategies from other contexts (e.g., driving) were applied to aquatic settings, but specific water safety knowledge/education was low. Stronger swimmers, Australian young adults and those who had received alcohol-specific water safety education displayed more knowledge of alcohol and its effects in aquatic contexts. Participants lacked awareness of alcohol-themed drowning prevention campaigns, and used campaign logos and names to interpret key messages. Little information was available on the alcohol-themed drowning prevention campaigns identified in the program audit and only two had evidence of evaluation, limiting progress of future prevention efforts. Ten quality criteria identified from evidence-based literature were considered to be necessary for inclusion in alcohol education programs. Programs included in the systematic review which incorporated these criteria were more likely to report success in influencing behaviour changes among the participants. CONCLUSIONS: To decrease the incidence of alcohol-related drowning among young adults, the findings of the projects included within this thesis result in the following recommendations. For enhanced likelihood of successful outcomes, alcohol-themed drowning prevention campaigns should align campaign design, implementation and evaluation with best-practice literature. The identified influencers on young adults’ involvement in alcohol-influenced aquatic activity, such as their peers, should be incorporated into prevention efforts and appropriate information provided to encourage informed decision making. Alcohol education programs (e.g., drink driving education) should include information about alcohol use in aquatic settings to clarify the risks associated with transferring safety strategies between drinking contexts, and appropriate information should be provided about alcohol consumption in aquatic settings.
- Description: Doctor of Philosophy
- Authors: Calverley, Hannah
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: BACKGROUND: Young adults are an at-risk group for experiencing an alcohol-related drowning incident. Investigations and drowning prevention efforts have aimed to address young adults’ prevalence in alcohol-related drownings and contribute to understanding their level of risk. Some explanations have concluded young adults’ need for autonomy and independence coincides with their exposure to alcohol and social norm pressures. However, gaps in knowledge remain, specifically young adults’: behaviours, knowledge and attitudes towards alcohol-influenced aquatic activity and the associated risks; and, their awareness and perceptions of alcohol-themed drowning prevention campaigns. METHODS: This PhD, completed with publications, aimed to address these gaps through four interlinked projects: (i) a systematic review of alcohol education programs to determine evidence-based quality criteria necessary for inclusion in programs to successfully change young adults’ alcohol-related behaviours, knowledge and attitudes; (ii) a program audit of alcohol-themed drowning prevention campaigns to establish current prevention efforts in high-income countries and areas for improvement; (iii) a survey among young adults from Australia and the United Kingdom to establish their knowledge, attitudes and predictors of intentions and involvement in alcohol-influenced aquatic activities; and, (iv) interviews to deepen understanding of young adults’ knowledge, attitudes and behaviours relating to alcohol-influenced aquatic activity, their awareness of alcohol-themed drowning prevention campaigns and their suggestions for improvement. Six publications resulted from this research. RESULTS: Friends influenced frequency of young adults’ involvement in alcohol-influenced aquatic activity, but involvement was dependent on the characteristics of the peer group, self-confidence and risk disassociation. Attitudes were neutral towards alcohol-influenced aquatic activity, but when participants perceived personal control over the risks it was deemed more acceptable. Alcohol-related safety strategies from other contexts (e.g., driving) were applied to aquatic settings, but specific water safety knowledge/education was low. Stronger swimmers, Australian young adults and those who had received alcohol-specific water safety education displayed more knowledge of alcohol and its effects in aquatic contexts. Participants lacked awareness of alcohol-themed drowning prevention campaigns, and used campaign logos and names to interpret key messages. Little information was available on the alcohol-themed drowning prevention campaigns identified in the program audit and only two had evidence of evaluation, limiting progress of future prevention efforts. Ten quality criteria identified from evidence-based literature were considered to be necessary for inclusion in alcohol education programs. Programs included in the systematic review which incorporated these criteria were more likely to report success in influencing behaviour changes among the participants. CONCLUSIONS: To decrease the incidence of alcohol-related drowning among young adults, the findings of the projects included within this thesis result in the following recommendations. For enhanced likelihood of successful outcomes, alcohol-themed drowning prevention campaigns should align campaign design, implementation and evaluation with best-practice literature. The identified influencers on young adults’ involvement in alcohol-influenced aquatic activity, such as their peers, should be incorporated into prevention efforts and appropriate information provided to encourage informed decision making. Alcohol education programs (e.g., drink driving education) should include information about alcohol use in aquatic settings to clarify the risks associated with transferring safety strategies between drinking contexts, and appropriate information should be provided about alcohol consumption in aquatic settings.
- Description: Doctor of Philosophy
The molecular characterisation of shigella spp. from Papua New Guinea and Pacific Island Nations
- Authors: Malau, Elisheba
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: In Papua New Guinea (PNG) and other low-middle income countries (LMICs) in Oceania, diarrhoea remains a leading cause of hospitalisation and death in children <5 years old; and is an important cause of illness in older children and adults. Shigella is one of four leading causes of diarrhoea globally and is likely a major cause of diarrhoea in Oceanic LMICs, particularly PNG. A survey was conducted among parents of children with diarrhoea in the PNG highlands, demonstrating limited access to, and application of, sanitation and hygiene; likely contributing to the transmission of Shigella and other pathogens in PNG. To better understand Shigella in Oceanic LMICs, multiple analyses of isolates from within PNG (n=38), far-northeastern Australia, and from travellers returning to Australia from Oceanic LMICs with shigellosis (n=34) were conducted. Antimicrobial susceptibility (by disc diffusion), detection of virulence genes by polymerase chain reaction (PCR) were conducted on all isolates, and whole genome sequencing (WGS) conducted on 63 isolates. Shigella spp. were commonly resistant to two or more classes of first-line antibiotics, with resistance more common in post-2010 relative to pre-2010 isolates. WGS was used to verify PCR detection of virulence genes, determine whether resistance could be predicted genetically, and conduct phylogenetic analysis of Shigella spp. in Oceania. WGS surpassed PCR in the detection of virulence genes, but correlated poorly with phenotypic antimicrobial resistance. Phylogenetic analysis revealed the intra- and inter-country relatedness. Three phylogenetic groups of S. flexneri co-exist in Oceanic LMICs (and far-northeastern Australia), the result of multiple incursions. Two lineages of S. sonnei were detected, one circulating in PNG and New Caledonia, and the other in various other countries including Fiji; with no geographical overlap of the two S. sonnei lineages. Incursions of Shigella into the Oceanic LMICs occur regularly, and are likely to occur again. This study provides evidence of the need for, and potential approach to, expanded surveillance of Shigella in the region.
- Description: Doctor of Philsophy
- Authors: Malau, Elisheba
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: In Papua New Guinea (PNG) and other low-middle income countries (LMICs) in Oceania, diarrhoea remains a leading cause of hospitalisation and death in children <5 years old; and is an important cause of illness in older children and adults. Shigella is one of four leading causes of diarrhoea globally and is likely a major cause of diarrhoea in Oceanic LMICs, particularly PNG. A survey was conducted among parents of children with diarrhoea in the PNG highlands, demonstrating limited access to, and application of, sanitation and hygiene; likely contributing to the transmission of Shigella and other pathogens in PNG. To better understand Shigella in Oceanic LMICs, multiple analyses of isolates from within PNG (n=38), far-northeastern Australia, and from travellers returning to Australia from Oceanic LMICs with shigellosis (n=34) were conducted. Antimicrobial susceptibility (by disc diffusion), detection of virulence genes by polymerase chain reaction (PCR) were conducted on all isolates, and whole genome sequencing (WGS) conducted on 63 isolates. Shigella spp. were commonly resistant to two or more classes of first-line antibiotics, with resistance more common in post-2010 relative to pre-2010 isolates. WGS was used to verify PCR detection of virulence genes, determine whether resistance could be predicted genetically, and conduct phylogenetic analysis of Shigella spp. in Oceania. WGS surpassed PCR in the detection of virulence genes, but correlated poorly with phenotypic antimicrobial resistance. Phylogenetic analysis revealed the intra- and inter-country relatedness. Three phylogenetic groups of S. flexneri co-exist in Oceanic LMICs (and far-northeastern Australia), the result of multiple incursions. Two lineages of S. sonnei were detected, one circulating in PNG and New Caledonia, and the other in various other countries including Fiji; with no geographical overlap of the two S. sonnei lineages. Incursions of Shigella into the Oceanic LMICs occur regularly, and are likely to occur again. This study provides evidence of the need for, and potential approach to, expanded surveillance of Shigella in the region.
- Description: Doctor of Philsophy
Applicability of LAMP as a field diagnostic test for haemonchus contortus and fasciola hepatica infection
- Authors: Bari, Tanjina
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Gastrointestinal parasites Haemonchus contortus and Fasciola hepatica are major impediments to livestock production worldwide. Faecal egg counts remain the most commonly used and widely accepted diagnostic tool for these parasites; however, there is a need for improved, field-applicable diagnostics. In this study, loop-mediated isothermal amplification (LAMP) was optimised and evaluated for the detection of H. contortus (in sheep) and F. hepatica (in cattle) infection. LAMP assays were optimised to enable visual detection using calcein dye. DNA extraction techniques were developed that have the potential for on-farm application. Faeces suspended in water, heated, then centrifuged, with two cheap and stable chemicals, enabled detection of H. contortus at clinically relevant infection burdens. For F. hepatica, a faeces-water suspension was sieved to remove particulate matter, then physical disruption (bead-beating) was applied. LAMP was conducted under laboratory conditions and in the field; compared to FEC (the most commonly used diagnostic for the target parasites) and PCR. LAMP was conducted using three incubation methods: a commercially available thermocycler; a field-friendly low-cost portable styrofoam esky; and a dedicated field applicable LAMP incubator. The general trend was for LAMP to have high sensitivity but only moderate specificity when compared to FEC. However, the use of PCR (both pathogens) and a highly sensitive amended FEC (F. hepatica only) suggested that the apparent low specificity was the result of LAMP being able to detect low-level parasite infection when conventional FEC could not. A LAMP assay paired with a potentially field-applicable DNA extraction was able to adequately detect haemonchosis at ‘clinically relevant’ parasite burdens in a laboratory study. A field study for the detection of F. hepatica demonstrated the potential utility of LAMP on-farm. The studies conducted in this thesis demonstrate the potential of LAMP for parasitic disease diagnosis in agriculture.
- Description: Doctor of Philosophy
- Authors: Bari, Tanjina
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Gastrointestinal parasites Haemonchus contortus and Fasciola hepatica are major impediments to livestock production worldwide. Faecal egg counts remain the most commonly used and widely accepted diagnostic tool for these parasites; however, there is a need for improved, field-applicable diagnostics. In this study, loop-mediated isothermal amplification (LAMP) was optimised and evaluated for the detection of H. contortus (in sheep) and F. hepatica (in cattle) infection. LAMP assays were optimised to enable visual detection using calcein dye. DNA extraction techniques were developed that have the potential for on-farm application. Faeces suspended in water, heated, then centrifuged, with two cheap and stable chemicals, enabled detection of H. contortus at clinically relevant infection burdens. For F. hepatica, a faeces-water suspension was sieved to remove particulate matter, then physical disruption (bead-beating) was applied. LAMP was conducted under laboratory conditions and in the field; compared to FEC (the most commonly used diagnostic for the target parasites) and PCR. LAMP was conducted using three incubation methods: a commercially available thermocycler; a field-friendly low-cost portable styrofoam esky; and a dedicated field applicable LAMP incubator. The general trend was for LAMP to have high sensitivity but only moderate specificity when compared to FEC. However, the use of PCR (both pathogens) and a highly sensitive amended FEC (F. hepatica only) suggested that the apparent low specificity was the result of LAMP being able to detect low-level parasite infection when conventional FEC could not. A LAMP assay paired with a potentially field-applicable DNA extraction was able to adequately detect haemonchosis at ‘clinically relevant’ parasite burdens in a laboratory study. A field study for the detection of F. hepatica demonstrated the potential utility of LAMP on-farm. The studies conducted in this thesis demonstrate the potential of LAMP for parasitic disease diagnosis in agriculture.
- 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
An examination of peripheral blood to reflect transcriptomic adaptation to physical exercise training in sedentary men compared with sex-matched athletic phenotypes
- Authors: Marin, Sergio
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: There is renewed interest in exercise genomics that peripheral blood RNA expression may be important to understand exercise mediated adaptations to exercise. However, there is little direct supporting evidence. Therefore, this thesis involved two studies to examine the relationship between RNA expression and exercise, and two experimental studies to examine relationships and adaptive response of peripheral blood RNA in sedentary compared with athletic phenotypes. In the first two studies, we conducted both meta-analysis and network meta-analysis to examine current randomised controlled trial (RCT) evidence to determine current best evidence on the link between RNA expression and athletic phenotype in addition to head-to-head comparison of different exercise types to induce differential expression of RNA transcripts in sedentary compared with athletic phenotypes. We observed that current available body of RCTs in peripheral blood exercise genomics presents too large heterogeneity in study design, methodological and data reporting aspects. Thus, we concluded that peripheral blood cannot be established as a valid source for identifying, neither the effect of physical exercise training on transcriptomic markers nor the distinction of divergent transcriptomic profiles in response to different exercise modalities. In the third and fourth studies, we aimed to determine whether peripheral blood RNA and circular RNA (circRNA) expression was different between sedentary and athletic phenotypes, and whether these transcripts were consistent in response to exercise training in exercise-naïve men. To achieve this, we conducted two STROBE compliant observational experiments of n=71 participants with distinct athletic phenotypes. We concluded that peripheral blood transcriptome expression might allow for identification of divergent athletic phenotypes, although this is not supported by further examination of peripheral blood RNA expression levels in response to an exercise training intervention. The sum of works presented in this thesis does not agree with many propositions relating to the strength of evidence in peripheral blood transcriptomics literature. This is principally due to the heterogeneity and lack of consistency of research in this field which is currently insufficient to provide any strong conclusions. In conclusion, peripheral blood RNA and circRNA do not yet offer useful avenues to predict the adaptive response to different exercise types in athletic and non-athletic men.
- Description: Doctor of Philosophy
- Authors: Marin, Sergio
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: There is renewed interest in exercise genomics that peripheral blood RNA expression may be important to understand exercise mediated adaptations to exercise. However, there is little direct supporting evidence. Therefore, this thesis involved two studies to examine the relationship between RNA expression and exercise, and two experimental studies to examine relationships and adaptive response of peripheral blood RNA in sedentary compared with athletic phenotypes. In the first two studies, we conducted both meta-analysis and network meta-analysis to examine current randomised controlled trial (RCT) evidence to determine current best evidence on the link between RNA expression and athletic phenotype in addition to head-to-head comparison of different exercise types to induce differential expression of RNA transcripts in sedentary compared with athletic phenotypes. We observed that current available body of RCTs in peripheral blood exercise genomics presents too large heterogeneity in study design, methodological and data reporting aspects. Thus, we concluded that peripheral blood cannot be established as a valid source for identifying, neither the effect of physical exercise training on transcriptomic markers nor the distinction of divergent transcriptomic profiles in response to different exercise modalities. In the third and fourth studies, we aimed to determine whether peripheral blood RNA and circular RNA (circRNA) expression was different between sedentary and athletic phenotypes, and whether these transcripts were consistent in response to exercise training in exercise-naïve men. To achieve this, we conducted two STROBE compliant observational experiments of n=71 participants with distinct athletic phenotypes. We concluded that peripheral blood transcriptome expression might allow for identification of divergent athletic phenotypes, although this is not supported by further examination of peripheral blood RNA expression levels in response to an exercise training intervention. The sum of works presented in this thesis does not agree with many propositions relating to the strength of evidence in peripheral blood transcriptomics literature. This is principally due to the heterogeneity and lack of consistency of research in this field which is currently insufficient to provide any strong conclusions. In conclusion, peripheral blood RNA and circRNA do not yet offer useful avenues to predict the adaptive response to different exercise types in athletic and non-athletic men.
- Description: Doctor of Philosophy
A multi-proxy approach to track ecological change in Gunbower Wetlands, Victoria, Australia
- Authors: Mall, Neeraj
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: The wetlands of the Murray-Darling Basin have come under the threat of a drying climate, the over-allocation of water for irrigation agriculture and widespread catchment disturbance. A synthesis of many paleolimnological assessments undertaken in the upper and lower sections of the Murray floodplain, and the Murrumbidgee, reveal considerable ecological change in wetlands from early in European settlement. The wetlands of the Gunbower Forest lie in the middle reaches of the Murray River. They are located on Gunbower Island that is deemed a wetland of international significance under the Ramsar Convention and an icon site under the Living Murray Initiative. Many Gunbower Island wetlands are located in protected forests, while others are within a zone developed for irrigation, mostly dairy, agriculture. This study analysed the sedimentary records of two wetlands within the forest estate and two within irrigation lands intending to compare long term change in the Gunbower wetlands to studies on floodplains both up and downstream, and to assess the relative impact of regional causes of change and that of local land use. Sediments constitute natural archives of past environmental changes. Sediment records were recovered from four wetlands and radiometric dating and multi-proxy paleoecological techniques were applied to assess how these wetlands have responded to changes in human occupation and other factors, such as climate. Then, extracted sediment cores were taken from Black (core length: 84 cm) and Green (86 cm) Swamps located in the forest, and Taylors (94 cm) and Cockatoo (74 cm) Lagoons were situated amongst dairy farms. In order to reconstruct ecological and water quality changes from the study sites, the cores were analysed using four different analysis techniques, i.e., Itrax-XRF (X-Ray Fluorescence) scanning, Lead-210 (210Pb) dating, Stable isotope and diatom analysis. XRF scanning provided evidence of the elemental composition of the cores. Detrital enrichment in the lower parts of all cores was observed, indicating elevated erosion rates or low water levels. In addition to this, some recent metal pollution was evident with high Cu, Ni and Pb inputs. Stable isotopes provided limited information on the carbon and nitrogen sources. The
- Description: Doctor of Philosophy
- Authors: Mall, Neeraj
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: The wetlands of the Murray-Darling Basin have come under the threat of a drying climate, the over-allocation of water for irrigation agriculture and widespread catchment disturbance. A synthesis of many paleolimnological assessments undertaken in the upper and lower sections of the Murray floodplain, and the Murrumbidgee, reveal considerable ecological change in wetlands from early in European settlement. The wetlands of the Gunbower Forest lie in the middle reaches of the Murray River. They are located on Gunbower Island that is deemed a wetland of international significance under the Ramsar Convention and an icon site under the Living Murray Initiative. Many Gunbower Island wetlands are located in protected forests, while others are within a zone developed for irrigation, mostly dairy, agriculture. This study analysed the sedimentary records of two wetlands within the forest estate and two within irrigation lands intending to compare long term change in the Gunbower wetlands to studies on floodplains both up and downstream, and to assess the relative impact of regional causes of change and that of local land use. Sediments constitute natural archives of past environmental changes. Sediment records were recovered from four wetlands and radiometric dating and multi-proxy paleoecological techniques were applied to assess how these wetlands have responded to changes in human occupation and other factors, such as climate. Then, extracted sediment cores were taken from Black (core length: 84 cm) and Green (86 cm) Swamps located in the forest, and Taylors (94 cm) and Cockatoo (74 cm) Lagoons were situated amongst dairy farms. In order to reconstruct ecological and water quality changes from the study sites, the cores were analysed using four different analysis techniques, i.e., Itrax-XRF (X-Ray Fluorescence) scanning, Lead-210 (210Pb) dating, Stable isotope and diatom analysis. XRF scanning provided evidence of the elemental composition of the cores. Detrital enrichment in the lower parts of all cores was observed, indicating elevated erosion rates or low water levels. In addition to this, some recent metal pollution was evident with high Cu, Ni and Pb inputs. Stable isotopes provided limited information on the carbon and nitrogen sources. The
- 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
Young mothers: Discursive constructions of their lives and identities
- Authors: Felstead, Karen
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: The notion that early motherhood is a significant problem for society is widely documented in the academic literature, and there is a complicated history surrounding young pregnant and parenting women in social and educational policy contexts. Less is known about young mothers themselves and how they experience the social and material effects of early motherhood. The purpose of this study was to examine how young mothers, who attended a young parent program in Lake City in Victoria Australia, experienced early motherhood and how they contested the social discourses that framed their lives. Using a poststructural lens and drawing on the work of Michel Foucault, this thesis used narrative inquiry and discourse analysis to examine the complex nature of seven young mothers’ lives. Analysis of the narrative data showed that despite the complexities, early motherhood was a significant turning point as the young mothers drew on resources of resistance and responsibility to transform their lives. An analysis of the social welfare policy practices identified surveillance and regulation measures as responses to alleviate long-term welfare dependency but did not account for the structural and economic barriers that young mothers encountered in their lives. In educational contexts, the young mothers in this study had experienced disrupted education trajectories before moving to an alternative setting. The findings highlight that they were ‘invisible’ in mainstream educational contexts and while ‘learning from the margins’ in the young parent program. This study found that the voice of the young mother was missing in the social and educational policy discourses, and the complexities of early motherhood were not accounted for within the policies. This thesis argues that young mothers’ voices need to be included in strategic policy responses to address issues of inequity and reduce the structural and economic barriers faced by young mothers.
- Description: Doctor of Philosophy
- Authors: Felstead, Karen
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: The notion that early motherhood is a significant problem for society is widely documented in the academic literature, and there is a complicated history surrounding young pregnant and parenting women in social and educational policy contexts. Less is known about young mothers themselves and how they experience the social and material effects of early motherhood. The purpose of this study was to examine how young mothers, who attended a young parent program in Lake City in Victoria Australia, experienced early motherhood and how they contested the social discourses that framed their lives. Using a poststructural lens and drawing on the work of Michel Foucault, this thesis used narrative inquiry and discourse analysis to examine the complex nature of seven young mothers’ lives. Analysis of the narrative data showed that despite the complexities, early motherhood was a significant turning point as the young mothers drew on resources of resistance and responsibility to transform their lives. An analysis of the social welfare policy practices identified surveillance and regulation measures as responses to alleviate long-term welfare dependency but did not account for the structural and economic barriers that young mothers encountered in their lives. In educational contexts, the young mothers in this study had experienced disrupted education trajectories before moving to an alternative setting. The findings highlight that they were ‘invisible’ in mainstream educational contexts and while ‘learning from the margins’ in the young parent program. This study found that the voice of the young mother was missing in the social and educational policy discourses, and the complexities of early motherhood were not accounted for within the policies. This thesis argues that young mothers’ voices need to be included in strategic policy responses to address issues of inequity and reduce the structural and economic barriers faced by young mothers.
- Description: Doctor of Philosophy