The relationship between business incubator services and the psychological capital of tenants
- Authors: Ollerenshaw, Alison
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: Business incubators (BI) provide a supportive environment for new tenant businesses to grow to independence. Incubators offer characteristic services including (a) space, physical resources, and infrastructure; (b) business support services, (c) networking; and, (d) structured selection, entry, and exit. Despite the global growth in incubator facilities, complemented by extensive research, knowledge gaps remain. Little research has examined the relationship between the characteristic services at incubators and tenants’ psychological capital; a higher-order construct representing an individual’s positive psychological state of development that includes hope, efficacy, resilience, and optimism. Preliminary examination of the characteristic services at business incubators show analogies with interventions for developing psychological capital. Two research studies were designed to examine these relationships. In the first study, survey (n = 30) and interview data (n = 12) were collected from incubator tenants to examine the existence of a relationship between the four characteristic services at business incubators and tenants’ psychological capital, their hope, efficacy, resilience, and optimism. The survey data confirmed the existence of a relationship between three incubator services – space, physical resources, and infrastructure, business support services, and networking – and tenants’ psychological capital. Tenants’ narrative experiences confirmed that these same three incubator services support tenants’ hope, efficacy, resilience, and optimism. This finding implies that the three incubator services contribute to, and augment tenants’ positive psychological states, which is then manifest in their positive behaviours and attitudes towards their business. To further elucidate these relationships a second study was conducted. Data from surveys (n = 75) and interviews (n = 28) with incubators managers also confirmed that space, physical resources, and infrastructure, business support services, and networking were analogous with methods that support tenants’ hope, efficacy, resilience, and optimism. These findings infer that incubator managers are not only instrumental in delivering these three characteristic services at incubators but are integral in optimising these services to benefit tenants’ hope, efficacy, resilience, and optimism. This current research provides robust evidence that three characteristic services at incubators are associated with tenants’ psychological capital, hope, efficacy, resilience, and optimism. These research findings are novel, and the implications for the incubator industry wide-ranging, with evidence indicating that the three characteristic services at incubators are analogous with interventions that support tenants’ psychological capital, and that incubator staff are integral to the delivery of these characteristic services. New directions for the incubator industry are proposed that include establishing a consistent approach to delivering the characteristic services at incubators that support incubator tenants’ businesses, and their positive psychological development.
- Description: Doctor of Philosophy
- Authors: Ollerenshaw, Alison
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: Business incubators (BI) provide a supportive environment for new tenant businesses to grow to independence. Incubators offer characteristic services including (a) space, physical resources, and infrastructure; (b) business support services, (c) networking; and, (d) structured selection, entry, and exit. Despite the global growth in incubator facilities, complemented by extensive research, knowledge gaps remain. Little research has examined the relationship between the characteristic services at incubators and tenants’ psychological capital; a higher-order construct representing an individual’s positive psychological state of development that includes hope, efficacy, resilience, and optimism. Preliminary examination of the characteristic services at business incubators show analogies with interventions for developing psychological capital. Two research studies were designed to examine these relationships. In the first study, survey (n = 30) and interview data (n = 12) were collected from incubator tenants to examine the existence of a relationship between the four characteristic services at business incubators and tenants’ psychological capital, their hope, efficacy, resilience, and optimism. The survey data confirmed the existence of a relationship between three incubator services – space, physical resources, and infrastructure, business support services, and networking – and tenants’ psychological capital. Tenants’ narrative experiences confirmed that these same three incubator services support tenants’ hope, efficacy, resilience, and optimism. This finding implies that the three incubator services contribute to, and augment tenants’ positive psychological states, which is then manifest in their positive behaviours and attitudes towards their business. To further elucidate these relationships a second study was conducted. Data from surveys (n = 75) and interviews (n = 28) with incubators managers also confirmed that space, physical resources, and infrastructure, business support services, and networking were analogous with methods that support tenants’ hope, efficacy, resilience, and optimism. These findings infer that incubator managers are not only instrumental in delivering these three characteristic services at incubators but are integral in optimising these services to benefit tenants’ hope, efficacy, resilience, and optimism. This current research provides robust evidence that three characteristic services at incubators are associated with tenants’ psychological capital, hope, efficacy, resilience, and optimism. These research findings are novel, and the implications for the incubator industry wide-ranging, with evidence indicating that the three characteristic services at incubators are analogous with interventions that support tenants’ psychological capital, and that incubator staff are integral to the delivery of these characteristic services. New directions for the incubator industry are proposed that include establishing a consistent approach to delivering the characteristic services at incubators that support incubator tenants’ businesses, and their positive psychological development.
- Description: Doctor of Philosophy
The role of Zn2+ in insulin signalling and muscle atrophy
- Authors: Maier, Michelle
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: Zn2+ is a broadly utilised ion in biology that has important catalytic, structural and regulatory roles within the cell. Zn2+ distribution in cells is maintained by zinc transporters, Zips and ZnTs, and disruptions in levels of Zn2+ have been associated with insulin resistance and muscle atrophy disorders. Zn2+ and reactive oxygen species (ROS) interact through inhibition of protein tyrosine phosphatases and ROS-mediated oxidation of the metal-binding metallothioneins (Mts) causing release of bound Zn2+, however the precise mechanisms are unclear. In the first study of this thesis addition of inhibitors of ROS-generating enzymes, superoxide dismutase 1 (SOD1) and NADPH oxidase 1 (NOX1) showed that only SOD1 inhibition increased short-term insulin-mediated Zn2+ release and increased the expression of Mt1 and 2. These results may suggest that ROS, in particular O2- accumulation through inhibition of SOD1, plays a role in insulin-mediated Zn2+ release. Inhibiting SOD1 prevents the conversion of O2- to H2O2 causing an accumulation of O2- in the cell which oxidises Mts to release Zn2+, thereby increasing Zn2+ levels within the cell. Manipulation of the expression of the zinc transporter Zip-7 has previously been shown to modulate cell signalling and glucose metabolism in C2C12 skeletal muscle cells, warranting further investigation into the role of Zn2+ within insulin signalling. Reducing Zip-7 expression when NOX1 was inhibited caused a decrease in Mt2 expression in response to insulin suggesting an interaction between insulin, Zip-7 and NOX1 activity but this requires further investigation. Skeletal muscle atrophy is a clinical symptom of insulin resistance and diabetes. Muscle atrophy is associated with increases in circulating glucocorticoid levels and accumulation of Zn2+ in muscle. This study investigates if Zn2+ homeostasis is disrupted in glucocorticoid-induced atrophy using C2C12 skeletal muscle cells treated with Dexamethasone (DEX) and iv insulin. Results demonstrate DEX-induced atrophy significantly increased the gene expression of the Mt1&2 and decreased glycogen accumulation when treated with insulin. Both confocal microscopy and flow cytometry showed significant increases in free cellular Zn2+ after DEX treatment. Notably, free Zn2+ levels observed with confocal microscopy increased after insulin treatment in control cells but decreased in DEX treated cells. Total cellular Zn2+ was increased by DEX treatment. This demonstrates that DEX causes Zn2+ accumulation in muscle cells and disrupts both Zn2+ homeostasis through blocking insulin-induced Zn2+ release, and insulin-induced glycogen synthesis. This raised the question of whether the same effects of atrophy on Zn2+ homeostasis apply to other cell systems. To investigate this, we examined adipose cells given that these too are involved in insulin resistance and muscle atrophy disorders. In this study we found similar increases in mRNA abundance of Mt1 & 2. Confocal microscopy revealed that DEX treatment caused changes in the distribution of free Zn2+ within peri-nuclear and cytosolic regions of the cell upon stimulation with insulin. Furthermore, investigation into morphometric changes using Oil Red O staining and particle analysis through Coherent Anti-Stokes Ramen Spectrophotometry (CARS) microscopy showed changes in cell and lipid droplet size consistent with reduced lipid turnover in DEX treated cells. These results highlight a potential mechanistic role for Zn2+ in the development of atrophy in 3T3-L1 adipocytes where increased free Zn2+ and its redistribution in cells may inhibit lipid metabolism downstream of insulin signalling. These findings show that insulin-induced Zn2+ release is disrupted by glucocorticoids and this is associated with insulin resistance. Restoring control of Zn2+ homeostasis, possibly through controlling oxidation or manipulating Zn2+ levels directly, may prove beneficial in metabolic disease states such as diabetes.
- Description: Doctor of Philosophy
- Authors: Maier, Michelle
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: Zn2+ is a broadly utilised ion in biology that has important catalytic, structural and regulatory roles within the cell. Zn2+ distribution in cells is maintained by zinc transporters, Zips and ZnTs, and disruptions in levels of Zn2+ have been associated with insulin resistance and muscle atrophy disorders. Zn2+ and reactive oxygen species (ROS) interact through inhibition of protein tyrosine phosphatases and ROS-mediated oxidation of the metal-binding metallothioneins (Mts) causing release of bound Zn2+, however the precise mechanisms are unclear. In the first study of this thesis addition of inhibitors of ROS-generating enzymes, superoxide dismutase 1 (SOD1) and NADPH oxidase 1 (NOX1) showed that only SOD1 inhibition increased short-term insulin-mediated Zn2+ release and increased the expression of Mt1 and 2. These results may suggest that ROS, in particular O2- accumulation through inhibition of SOD1, plays a role in insulin-mediated Zn2+ release. Inhibiting SOD1 prevents the conversion of O2- to H2O2 causing an accumulation of O2- in the cell which oxidises Mts to release Zn2+, thereby increasing Zn2+ levels within the cell. Manipulation of the expression of the zinc transporter Zip-7 has previously been shown to modulate cell signalling and glucose metabolism in C2C12 skeletal muscle cells, warranting further investigation into the role of Zn2+ within insulin signalling. Reducing Zip-7 expression when NOX1 was inhibited caused a decrease in Mt2 expression in response to insulin suggesting an interaction between insulin, Zip-7 and NOX1 activity but this requires further investigation. Skeletal muscle atrophy is a clinical symptom of insulin resistance and diabetes. Muscle atrophy is associated with increases in circulating glucocorticoid levels and accumulation of Zn2+ in muscle. This study investigates if Zn2+ homeostasis is disrupted in glucocorticoid-induced atrophy using C2C12 skeletal muscle cells treated with Dexamethasone (DEX) and iv insulin. Results demonstrate DEX-induced atrophy significantly increased the gene expression of the Mt1&2 and decreased glycogen accumulation when treated with insulin. Both confocal microscopy and flow cytometry showed significant increases in free cellular Zn2+ after DEX treatment. Notably, free Zn2+ levels observed with confocal microscopy increased after insulin treatment in control cells but decreased in DEX treated cells. Total cellular Zn2+ was increased by DEX treatment. This demonstrates that DEX causes Zn2+ accumulation in muscle cells and disrupts both Zn2+ homeostasis through blocking insulin-induced Zn2+ release, and insulin-induced glycogen synthesis. This raised the question of whether the same effects of atrophy on Zn2+ homeostasis apply to other cell systems. To investigate this, we examined adipose cells given that these too are involved in insulin resistance and muscle atrophy disorders. In this study we found similar increases in mRNA abundance of Mt1 & 2. Confocal microscopy revealed that DEX treatment caused changes in the distribution of free Zn2+ within peri-nuclear and cytosolic regions of the cell upon stimulation with insulin. Furthermore, investigation into morphometric changes using Oil Red O staining and particle analysis through Coherent Anti-Stokes Ramen Spectrophotometry (CARS) microscopy showed changes in cell and lipid droplet size consistent with reduced lipid turnover in DEX treated cells. These results highlight a potential mechanistic role for Zn2+ in the development of atrophy in 3T3-L1 adipocytes where increased free Zn2+ and its redistribution in cells may inhibit lipid metabolism downstream of insulin signalling. These findings show that insulin-induced Zn2+ release is disrupted by glucocorticoids and this is associated with insulin resistance. Restoring control of Zn2+ homeostasis, possibly through controlling oxidation or manipulating Zn2+ levels directly, may prove beneficial in metabolic disease states such as diabetes.
- Description: Doctor of Philosophy
Three-dimensional numerical study on the batter instability mechanism of Maddingley Brown Coal Open Pit, Victoria, Australia using PLAXIS 3D
- Authors: Zhao, Lei
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: With the increased size of excavation due to long-term open cut mining, batter instability has become a major geo-hazard in Victorian Brown Coal Open Pits where facilitate some largest brown coal mining operations in the world. Block failure is a unique failure mode in Victorian brown coal mines, which is often associated with cracks and rainfall. Maddingley Brown Coal Mine (MBC) is located in Bacchus Marsh, Victoria, Australia. Slope instability has also been a major geo-problem since the open pit mining commenced in MBC in 1940s. Making clear the cracking mechanism and the correlations between rainfall and batter instability have important implications in better understanding and predicting batter failures in Victorian brown coal mines. In this research, three-dimensional geologic models were developed to investigate the mechanism of brown coal batter instability. The finite element program encoded in Plaxis 3D was employed to conduct the complex two-phase (fluid-solid) coupled numerical simulations. The results revealed the cracking mechanism of coal batter and the effects of rainfall on batter stability. It was found that the brown coal batter with overburden tends to lead a circular critical path while the batter after overburden removal shows a trend of block sliding as interpreted by the shear and tensile strains simulated. The existence of joints and the hydrostatic water pressure in the joints could adversely affect the stability of brown coal batter towards block failure. Precipitation can increase the deformation, excess pore pressure, total pore pressure, active pressure and decrease the matric suction, and thereby decrease the shear strength, effective stress, and batter stability. The results from the three-dimensional hydro-mechanically coupled finite element study were well agreed with the field monitored data, theoretical calculations, and Victorian brown coal mining experience.
- Description: Doctor of Philosophy
- Authors: Zhao, Lei
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: With the increased size of excavation due to long-term open cut mining, batter instability has become a major geo-hazard in Victorian Brown Coal Open Pits where facilitate some largest brown coal mining operations in the world. Block failure is a unique failure mode in Victorian brown coal mines, which is often associated with cracks and rainfall. Maddingley Brown Coal Mine (MBC) is located in Bacchus Marsh, Victoria, Australia. Slope instability has also been a major geo-problem since the open pit mining commenced in MBC in 1940s. Making clear the cracking mechanism and the correlations between rainfall and batter instability have important implications in better understanding and predicting batter failures in Victorian brown coal mines. In this research, three-dimensional geologic models were developed to investigate the mechanism of brown coal batter instability. The finite element program encoded in Plaxis 3D was employed to conduct the complex two-phase (fluid-solid) coupled numerical simulations. The results revealed the cracking mechanism of coal batter and the effects of rainfall on batter stability. It was found that the brown coal batter with overburden tends to lead a circular critical path while the batter after overburden removal shows a trend of block sliding as interpreted by the shear and tensile strains simulated. The existence of joints and the hydrostatic water pressure in the joints could adversely affect the stability of brown coal batter towards block failure. Precipitation can increase the deformation, excess pore pressure, total pore pressure, active pressure and decrease the matric suction, and thereby decrease the shear strength, effective stress, and batter stability. The results from the three-dimensional hydro-mechanically coupled finite element study were well agreed with the field monitored data, theoretical calculations, and Victorian brown coal mining experience.
- Description: Doctor of Philosophy
Time experience and judgement in depression : A theory of isomorphic general relativity (TIGR)
- Authors: Kent, Lachlan
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis presents studies assessing aspects of time experience and judgement in depression. It focuses on a phenomenon called time dilation, which is the perception of slow temporal flow in conscious experience. This thesis by publication explains a novel theory of time dilation in depression, called the Theory of Isomorphic General Relativity (TIGR), and elaborates this theory to propose a general framework for consciousness and cognition according to timescale. The final outcome is a dual-pronged theory of time consciousness and the experience of time dilation in depression that has the same form as Einstein’s (1920) general theory of relativity. The thesis begins with a published paper called “Duration perception versus perception duration: A proposed model for the consciously experienced moment” (Kent, 2019). This paper defines temporal flow in conscious experience in terms of an interval of time perception known as the ‘experienced moment’ (Wittmann, 2011). In this paper, I reviewed evidence for a view of time dilation in depression that is distinct from either immediate sensory integration or working memory (WM) activity. The thesis continues with a second published paper called “Time dilation and acceleration in depression” (Kent, Van Doorn, & Klein, 2019) that reviews the literature specific to time perception in depression, and meta-analytically tests the preceding definition of time dilation within the experienced moment. This paper also details the experimental methodology used and proposes the TIGR as a descriptive and explanatory theory of time perception. xx The third published paper, “Bayes, time perception, and relativity: The central role of hopelessness” (Kent, Van Doorn, Hohwy, & Klein, 2019), formulates and tests the TIGR in a time perception experiment using the methodology outlined in the second paper. The time judgement and experience data of 64 participants, with and without sub-clinical symptoms of depression, were analysed using a statistical version of a Bayesian prediction error minimisation framework called ‘distrusting the present’ (Hohwy, Paton, & Palmer, 2016). The results showed that hopelessness was associated with slower time experience, while arousal was associated with faster time experience. The paper also supported the use of a relative difference equation to model these effects. This relative difference equation has the same general form as a basic general relativity equation used to calculate time dilation due to gravity, called the Schwarzschild metric (Schwarzschild, 1916). The fourth paper, “Time perception in depression: A perceived delay cues feelings of hopelessness” (Kent, Van Doorn, Hohwy, & Klein, under review), is under review by the journal Acta Psychologica. It looks more closely at the experimental effect reported in the third paper to explore the clinical implications of an increase in hopelessness caused by a brief time production task. The analysis showed that a particular sub-factor of the Beck Hopelessness Scale (BHS) called ‘feelings of hopelessness’ was more affected than other facets of hopelessness (Beck, Weissman, Lester, & Trexler, 1974). The fifth paper, “Systema temporis: A time-based dimensional framework for consciousness and cognition” (Kent, Van Doorn, & Klein, under review), is currently under review by the journal Consciousness and Cognition. In this paper, we extend elements of the TIGR related to consciousness in the first four papers xxi to argue that time consciousness can be used to systematise aspects of consciousness and cognition. The paper proposes a hierarchical framework that reflects the commonly-conceived structure of memory, intelligence, and emotional intelligence. This framework integrates aspects of consciousness including experience, wakefulness, and self-consciousness. The final paper, submitted to the journal Personality and Social Psychology Review and entitled “Systema psyches: A time-based framework for consciousness, cognition and related psychological and social theories” (Kent, Van Doorn, & Klein, submitted) extends the ‘Systema Temporis’ paper to incorporate extended timeframes and theories of social cognition including personality, cognitive and moral development, and personal values. The analysis suggests that time consciousness is also a facet of collective experience and so, in framing the closing discussion around time dilation in depression, the thesis concludes that the TIGR extends beyond the narrow domain of individual psychopathology to incorporate timescales of collective memory and human evolution.
- Description: Doctor of Philosophy
- Authors: Kent, Lachlan
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis presents studies assessing aspects of time experience and judgement in depression. It focuses on a phenomenon called time dilation, which is the perception of slow temporal flow in conscious experience. This thesis by publication explains a novel theory of time dilation in depression, called the Theory of Isomorphic General Relativity (TIGR), and elaborates this theory to propose a general framework for consciousness and cognition according to timescale. The final outcome is a dual-pronged theory of time consciousness and the experience of time dilation in depression that has the same form as Einstein’s (1920) general theory of relativity. The thesis begins with a published paper called “Duration perception versus perception duration: A proposed model for the consciously experienced moment” (Kent, 2019). This paper defines temporal flow in conscious experience in terms of an interval of time perception known as the ‘experienced moment’ (Wittmann, 2011). In this paper, I reviewed evidence for a view of time dilation in depression that is distinct from either immediate sensory integration or working memory (WM) activity. The thesis continues with a second published paper called “Time dilation and acceleration in depression” (Kent, Van Doorn, & Klein, 2019) that reviews the literature specific to time perception in depression, and meta-analytically tests the preceding definition of time dilation within the experienced moment. This paper also details the experimental methodology used and proposes the TIGR as a descriptive and explanatory theory of time perception. xx The third published paper, “Bayes, time perception, and relativity: The central role of hopelessness” (Kent, Van Doorn, Hohwy, & Klein, 2019), formulates and tests the TIGR in a time perception experiment using the methodology outlined in the second paper. The time judgement and experience data of 64 participants, with and without sub-clinical symptoms of depression, were analysed using a statistical version of a Bayesian prediction error minimisation framework called ‘distrusting the present’ (Hohwy, Paton, & Palmer, 2016). The results showed that hopelessness was associated with slower time experience, while arousal was associated with faster time experience. The paper also supported the use of a relative difference equation to model these effects. This relative difference equation has the same general form as a basic general relativity equation used to calculate time dilation due to gravity, called the Schwarzschild metric (Schwarzschild, 1916). The fourth paper, “Time perception in depression: A perceived delay cues feelings of hopelessness” (Kent, Van Doorn, Hohwy, & Klein, under review), is under review by the journal Acta Psychologica. It looks more closely at the experimental effect reported in the third paper to explore the clinical implications of an increase in hopelessness caused by a brief time production task. The analysis showed that a particular sub-factor of the Beck Hopelessness Scale (BHS) called ‘feelings of hopelessness’ was more affected than other facets of hopelessness (Beck, Weissman, Lester, & Trexler, 1974). The fifth paper, “Systema temporis: A time-based dimensional framework for consciousness and cognition” (Kent, Van Doorn, & Klein, under review), is currently under review by the journal Consciousness and Cognition. In this paper, we extend elements of the TIGR related to consciousness in the first four papers xxi to argue that time consciousness can be used to systematise aspects of consciousness and cognition. The paper proposes a hierarchical framework that reflects the commonly-conceived structure of memory, intelligence, and emotional intelligence. This framework integrates aspects of consciousness including experience, wakefulness, and self-consciousness. The final paper, submitted to the journal Personality and Social Psychology Review and entitled “Systema psyches: A time-based framework for consciousness, cognition and related psychological and social theories” (Kent, Van Doorn, & Klein, submitted) extends the ‘Systema Temporis’ paper to incorporate extended timeframes and theories of social cognition including personality, cognitive and moral development, and personal values. The analysis suggests that time consciousness is also a facet of collective experience and so, in framing the closing discussion around time dilation in depression, the thesis concludes that the TIGR extends beyond the narrow domain of individual psychopathology to incorporate timescales of collective memory and human evolution.
- Description: Doctor of Philosophy
Tropical cyclone tracks in CMIP5 models : statistical assessment and future projections
- Authors: Bell, Samuel
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: Tropical cyclones (TCs) can have devastating social and economic impacts on coastal communities situated all around the globe. The impact of anthropogenic induced climate change on TC activity has attracted widespread scientific interest over the past decade, resulting in the development of a variety of approaches for TC projection in climate models. However, many uncertainties remain, including those associated with the TC detection algorithm and climate model inter-dependencies that impact projection results. This thesis seeks to address these uncertainties, as well as filling several knowledge gaps in the literature such as limited TC projection studies in the Southern Hemisphere and a global need for regional-scale TC track density projections. The independent TC detection and tracking algorithm utilised in this thesis is first evaluated to determine if it can simulate a realistic TC track climatology in reanalysis data. By way of cluster analysis, model-detected and observed TC tracks are compared and objective criteria for a consistent “TC track” definition are established. Regional-scale TC track projections are then examined in each TC basin around the globe. The exact methodology of cluster analysis in each basin is slightly modified to accommodate basin-scale differences in track climatology but generally follows a cluster assessment of TC tracks in observations, historical climate simulations and future climate projections using results from the Coupled Model Intercomparison Project Phase 5 (CMIP5) models. Regional impacts of the El Niño Southern Oscillation (ENSO) on TC tracks are also examined in current- and future-climates. Projection results are found to be supportive of existing studies, especially in the North Pacific and the Southern Hemisphere. Isolation of TC tracks into clusters indicated that the regional dominance of ENSO is well simulated by the CMIP5 models. Several regional changes in TC activity are noted and attributed to projected changes in the large-scale environment, and changes in ENSO-specific conditions.
- Description: Doctor of Philosophy
- Authors: Bell, Samuel
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: Tropical cyclones (TCs) can have devastating social and economic impacts on coastal communities situated all around the globe. The impact of anthropogenic induced climate change on TC activity has attracted widespread scientific interest over the past decade, resulting in the development of a variety of approaches for TC projection in climate models. However, many uncertainties remain, including those associated with the TC detection algorithm and climate model inter-dependencies that impact projection results. This thesis seeks to address these uncertainties, as well as filling several knowledge gaps in the literature such as limited TC projection studies in the Southern Hemisphere and a global need for regional-scale TC track density projections. The independent TC detection and tracking algorithm utilised in this thesis is first evaluated to determine if it can simulate a realistic TC track climatology in reanalysis data. By way of cluster analysis, model-detected and observed TC tracks are compared and objective criteria for a consistent “TC track” definition are established. Regional-scale TC track projections are then examined in each TC basin around the globe. The exact methodology of cluster analysis in each basin is slightly modified to accommodate basin-scale differences in track climatology but generally follows a cluster assessment of TC tracks in observations, historical climate simulations and future climate projections using results from the Coupled Model Intercomparison Project Phase 5 (CMIP5) models. Regional impacts of the El Niño Southern Oscillation (ENSO) on TC tracks are also examined in current- and future-climates. Projection results are found to be supportive of existing studies, especially in the North Pacific and the Southern Hemisphere. Isolation of TC tracks into clusters indicated that the regional dominance of ENSO is well simulated by the CMIP5 models. Several regional changes in TC activity are noted and attributed to projected changes in the large-scale environment, and changes in ENSO-specific conditions.
- Description: Doctor of Philosophy
100 years of annual reporting by Australian Red Cross : Accountability amidst wars, disasters and loss of life
- Authors: Langton, Jonathan
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Purpose: This critical interpretive and historical case study of Australian Red Cross extends from the organisation’s beginning in 1914 through to the present day. The overarching purpose is to reveal and analyse the annual reporting practices of one of Australia’s oldest and most important humanitarian organisations in the discharge of accountability over the course of a century. Design/methodology/approach: A Political Economy of Accounting theoretical framework guides the content analysis and interpretation of findings. Background: While the review of literature acknowledges the annual report as a crucial element in the discharge of accountability, studies investigating the evolution of annual reports of International nongovernmental development and humanitarian aid organisations (INGDHOs) over extended periods of time appear to be absent from the literature. Findings: The annual reports were found to be responsive to the changing social, political, economic and institutional environment, casting doubt on any claims to objectivity in organisational management’s disclosures, including assertions regarding unadulterated adherence to its Fundamental Principles. Furthermore, sources of pressure from the wider environmental context impacted upon the development of accountability regimes and shaped the way in which organisational management reported to stakeholders. These regimes evidence the alignment of mission preservation and emotive disclosures with strategic priorities. Implications: This study extends understandings of how INGDHOs discharge accountability through annual reporting practices. It provides a more holistic framework for understanding the role of accountability in organisational management reporting, the development of accountability regimes and the implications for organisational and social functioning. Originality/value (significance): The contribution is distinctive not only for the context and extensive period covered, but also for the significant institutional setting of Australian Red Cross – encompassing deep social, political, economic and institutional changes. This adds to the extant literature and provides significant insights into the contested interplay between annual reporting practices and accountability regimes.
- Description: Doctor of Philosophy
- Authors: Langton, Jonathan
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Purpose: This critical interpretive and historical case study of Australian Red Cross extends from the organisation’s beginning in 1914 through to the present day. The overarching purpose is to reveal and analyse the annual reporting practices of one of Australia’s oldest and most important humanitarian organisations in the discharge of accountability over the course of a century. Design/methodology/approach: A Political Economy of Accounting theoretical framework guides the content analysis and interpretation of findings. Background: While the review of literature acknowledges the annual report as a crucial element in the discharge of accountability, studies investigating the evolution of annual reports of International nongovernmental development and humanitarian aid organisations (INGDHOs) over extended periods of time appear to be absent from the literature. Findings: The annual reports were found to be responsive to the changing social, political, economic and institutional environment, casting doubt on any claims to objectivity in organisational management’s disclosures, including assertions regarding unadulterated adherence to its Fundamental Principles. Furthermore, sources of pressure from the wider environmental context impacted upon the development of accountability regimes and shaped the way in which organisational management reported to stakeholders. These regimes evidence the alignment of mission preservation and emotive disclosures with strategic priorities. Implications: This study extends understandings of how INGDHOs discharge accountability through annual reporting practices. It provides a more holistic framework for understanding the role of accountability in organisational management reporting, the development of accountability regimes and the implications for organisational and social functioning. Originality/value (significance): The contribution is distinctive not only for the context and extensive period covered, but also for the significant institutional setting of Australian Red Cross – encompassing deep social, political, economic and institutional changes. This adds to the extant literature and provides significant insights into the contested interplay between annual reporting practices and accountability regimes.
- Description: Doctor of Philosophy
A comparative analysis of domestic violence against women in Australia and Bangladesh : government policies, legislation and organisational responses
- Authors: Rahman, Nasrin
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: This is a comparative study of Domestic Violence (DV) between Australia (Victoria) and Bangladesh. It examined the interrelationship between factors which contribute to DV, government policies and legislation developed to deal with DV, and organisational responders (police and DV Crisis Support Services) implementing strategies and remedies in the policies and legislation. A comparative country case study strategy was adopted utilising triangulation of methods of data collection including an analysis of the countries’ respective policies and legislation and conducting in-depth interviews with key responder personnel. The conceptual framework identified policies and legislation as Steering Media, which influenced a society’s beliefs embedded in the Lifeworld, and which guided the actions of responders to DV in the two different countries’ Systems. Differences and similarities were found between the two countries. The main common factor was the identification of gender inequality as an underlying factor causing DV. Some social and cultural factors exist in both countries such as poverty. Some factors were specific to Australia, such as the consumption of alcohol; and in Bangladesh, such as dowry and dependency on men. Of significance is that gender equality is enshrined in the Bangladeshi Constitution, while Australia relies on legislation that could potentially be changed to disadvantage women. Differences revealed include identification of victims and perpetrators, with Bangladesh specifically naming women and children as victims but never the perpetrator and Australia (Victoria) naming any family member as victim or perpetrator. Also, responders deal with DV victims and perpetrators differently according to the policies and legislation of both countries. This research has implications for both theory and practice in both countries. The findings have potential to contribute to changes in policy and legislation related to DV as well as in the practice level by responders across both countries, learning from each other in the process.
- Description: Doctor of Philosophy
- Authors: Rahman, Nasrin
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: This is a comparative study of Domestic Violence (DV) between Australia (Victoria) and Bangladesh. It examined the interrelationship between factors which contribute to DV, government policies and legislation developed to deal with DV, and organisational responders (police and DV Crisis Support Services) implementing strategies and remedies in the policies and legislation. A comparative country case study strategy was adopted utilising triangulation of methods of data collection including an analysis of the countries’ respective policies and legislation and conducting in-depth interviews with key responder personnel. The conceptual framework identified policies and legislation as Steering Media, which influenced a society’s beliefs embedded in the Lifeworld, and which guided the actions of responders to DV in the two different countries’ Systems. Differences and similarities were found between the two countries. The main common factor was the identification of gender inequality as an underlying factor causing DV. Some social and cultural factors exist in both countries such as poverty. Some factors were specific to Australia, such as the consumption of alcohol; and in Bangladesh, such as dowry and dependency on men. Of significance is that gender equality is enshrined in the Bangladeshi Constitution, while Australia relies on legislation that could potentially be changed to disadvantage women. Differences revealed include identification of victims and perpetrators, with Bangladesh specifically naming women and children as victims but never the perpetrator and Australia (Victoria) naming any family member as victim or perpetrator. Also, responders deal with DV victims and perpetrators differently according to the policies and legislation of both countries. This research has implications for both theory and practice in both countries. The findings have potential to contribute to changes in policy and legislation related to DV as well as in the practice level by responders across both countries, learning from each other in the process.
- Description: Doctor of Philosophy
A conceptual framework for a theory of liquidity
- Authors: Culham, James
- Date: 2018
- Type: Text , Thesis , Masters , PhD
- Full Text:
- Description: This study contributes to the understanding of liquidity in two ways. First, it considers the multifaceted nature of liquidity and its relationship with money. Second, it constructs a conceptual framework for a theory of liquidity. The first contribution is achieved by clarifying and categorising the various forms of liquidity to identify those overlooked by the existing literature. The second contribution consists of a realist critique of the literature on liquidity and money to highlight the strengths and weaknesses of each theoretical approach. The study reflects on the attempts to analyse liquidity using moneyless models of perfect barter with the assumption that every commodity exhibits perfect saleability; an assumption that removes any need for a medium of exchange and, moreover, crowds out all other forms of liquidity. It is concluded that, because liquidity is a social and monetary phenomenon, it cannot be analysed with models populated by a representative agent consuming a single commodity. Furthermore, this conclusion is not altered by the introduction of ‘financial frictions’, which are fundamentally at odds with the nature of money. Instead, the clarification of the nature of liquidity forms the basis for an interpretation of Keynes’s theory of liquidity preference that emphasises its reliance on liquidity in general, not money in particular. The study introduces the terms redemption liquidity and exchange liquidity to explain the trade-off that underpins the theory of liquidity preference. Properly interpreted, the theory of liquidity preference can then address many of the deficiencies prevalent in the dominant theories of the rate of interest. The study therefore has implications for monetary policy and asset pricing.
- Description: Doctor of Philosophy
- Authors: Culham, James
- Date: 2018
- Type: Text , Thesis , Masters , PhD
- Full Text:
- Description: This study contributes to the understanding of liquidity in two ways. First, it considers the multifaceted nature of liquidity and its relationship with money. Second, it constructs a conceptual framework for a theory of liquidity. The first contribution is achieved by clarifying and categorising the various forms of liquidity to identify those overlooked by the existing literature. The second contribution consists of a realist critique of the literature on liquidity and money to highlight the strengths and weaknesses of each theoretical approach. The study reflects on the attempts to analyse liquidity using moneyless models of perfect barter with the assumption that every commodity exhibits perfect saleability; an assumption that removes any need for a medium of exchange and, moreover, crowds out all other forms of liquidity. It is concluded that, because liquidity is a social and monetary phenomenon, it cannot be analysed with models populated by a representative agent consuming a single commodity. Furthermore, this conclusion is not altered by the introduction of ‘financial frictions’, which are fundamentally at odds with the nature of money. Instead, the clarification of the nature of liquidity forms the basis for an interpretation of Keynes’s theory of liquidity preference that emphasises its reliance on liquidity in general, not money in particular. The study introduces the terms redemption liquidity and exchange liquidity to explain the trade-off that underpins the theory of liquidity preference. Properly interpreted, the theory of liquidity preference can then address many of the deficiencies prevalent in the dominant theories of the rate of interest. The study therefore has implications for monetary policy and asset pricing.
- Description: Doctor of Philosophy
A new perceptual dissimilarity measure for image retrieval and clustering
- Authors: Shojanazeri, Hamid
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Image retrieval and clustering are two important tools for analysing and organising images. Dissimilarity measure is central to both image retrieval and clustering. The performance of image retrieval and clustering algorithms depends on the effectiveness of the dissimilarity measure. ‘Minkowski’ distance, or more specifically, ‘Euclidean’ distance, is the most widely used dissimilarity measure in image retrieval and clustering. Euclidean distance depends only on the geometric position of two data instances in the feature space and completely ignores the data distribution. However, data distribution has an effect on human perception. The argument that two data instances in a dense area are more perceptually dissimilar than the same two instances in a sparser area, is proposed by psychologists. Based on this idea, a dissimilarity measure called, ‘mp’, has been proposed to address Euclidean distance’s limitation of ignoring the data distribution. Here, mp relies on data distribution to calculate the dissimilarity between two instances. As prescribed in mp, higher data mass between two data instances implies higher dissimilarity, and vice versa. mp relies only on data distribution and completely ignores the geometric distance in its calculations. In the aggregation of dissimilarities between two instances over all the dimensions in feature space, both Euclidean distance and mp give same priority to all the dimensions. This may result in a situation that the final dissimilarity between two data instances is determined by a few dimensions of feature vectors with relatively much higher values. As a result, the dissimilarity derived may not align well with human perception. The need to address the limitations of Minkowski distance measures, along with the importance of a dissimilarity measure that considers both geometric distance and the perceptual effect of data distribution in measuring dissimilarity between images motivated this thesis. It studies the performance of mp for image retrieval. It investigates a new dissimilarity measure that combines both Euclidean distance and data distribution. In addition to these, it studies the performance of such a dissimilarity measure for image retrieval and clustering. Our performance study of mp for image retrieval shows that relying only on data distribution to measure the dissimilarity results in some situations, where the mp’s measurement is contrary to human perception. This thesis introduces a new dissimilarity measure called, perceptual dissimilarity measure (PDM). PDM considers the perceptual effect of data distribution in combination with Euclidean distance. PDM has two variants, PDM1 and PDM2. PDM1 focuses on improving mp by weighting it using Euclidean distance in situations where mp may not retrieve accurate results. PDM2 considers the effect of data distribution on the perceived dissimilarity measured by Euclidean distance. PDM2 proposes a weighting system for Euclidean distance using a logarithmic transform of data mass. The proposed PDM variants have been used as alternatives to Euclidean distance and mp to improve the accuracy in image retrieval. Our results show that PDM2 has consistently performed the best, compared to Euclidean distance, mp and PDM1. PDM1’s performance was not consistent, although it has performed better than mp in all the experiments, but it could not outperform Euclidean distance in some cases. Following the promising results of PDM2 in image retrieval, we have studied its performance for image clustering. k-means is the most widely used clustering algorithm in scientific and industrial applications. k-medoids is the closest clustering algorithm to k-means. Unlike k-means which works only with Euclidean distance, k-medoids gives the option to choose the arbitrary dissimilarity measure. We have used Euclidean distance, mp and PDM2 as the dissimilarity measure in k-medoids and compared the results with k-means. Our clustering results show that PDM2 has perfromed overally the best. This confirms our retrieval results and identifies PDM2 as a suitable dissimilarity measure for image retrieval and clustering.
- Description: Doctor of Philosophy
- Authors: Shojanazeri, Hamid
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Image retrieval and clustering are two important tools for analysing and organising images. Dissimilarity measure is central to both image retrieval and clustering. The performance of image retrieval and clustering algorithms depends on the effectiveness of the dissimilarity measure. ‘Minkowski’ distance, or more specifically, ‘Euclidean’ distance, is the most widely used dissimilarity measure in image retrieval and clustering. Euclidean distance depends only on the geometric position of two data instances in the feature space and completely ignores the data distribution. However, data distribution has an effect on human perception. The argument that two data instances in a dense area are more perceptually dissimilar than the same two instances in a sparser area, is proposed by psychologists. Based on this idea, a dissimilarity measure called, ‘mp’, has been proposed to address Euclidean distance’s limitation of ignoring the data distribution. Here, mp relies on data distribution to calculate the dissimilarity between two instances. As prescribed in mp, higher data mass between two data instances implies higher dissimilarity, and vice versa. mp relies only on data distribution and completely ignores the geometric distance in its calculations. In the aggregation of dissimilarities between two instances over all the dimensions in feature space, both Euclidean distance and mp give same priority to all the dimensions. This may result in a situation that the final dissimilarity between two data instances is determined by a few dimensions of feature vectors with relatively much higher values. As a result, the dissimilarity derived may not align well with human perception. The need to address the limitations of Minkowski distance measures, along with the importance of a dissimilarity measure that considers both geometric distance and the perceptual effect of data distribution in measuring dissimilarity between images motivated this thesis. It studies the performance of mp for image retrieval. It investigates a new dissimilarity measure that combines both Euclidean distance and data distribution. In addition to these, it studies the performance of such a dissimilarity measure for image retrieval and clustering. Our performance study of mp for image retrieval shows that relying only on data distribution to measure the dissimilarity results in some situations, where the mp’s measurement is contrary to human perception. This thesis introduces a new dissimilarity measure called, perceptual dissimilarity measure (PDM). PDM considers the perceptual effect of data distribution in combination with Euclidean distance. PDM has two variants, PDM1 and PDM2. PDM1 focuses on improving mp by weighting it using Euclidean distance in situations where mp may not retrieve accurate results. PDM2 considers the effect of data distribution on the perceived dissimilarity measured by Euclidean distance. PDM2 proposes a weighting system for Euclidean distance using a logarithmic transform of data mass. The proposed PDM variants have been used as alternatives to Euclidean distance and mp to improve the accuracy in image retrieval. Our results show that PDM2 has consistently performed the best, compared to Euclidean distance, mp and PDM1. PDM1’s performance was not consistent, although it has performed better than mp in all the experiments, but it could not outperform Euclidean distance in some cases. Following the promising results of PDM2 in image retrieval, we have studied its performance for image clustering. k-means is the most widely used clustering algorithm in scientific and industrial applications. k-medoids is the closest clustering algorithm to k-means. Unlike k-means which works only with Euclidean distance, k-medoids gives the option to choose the arbitrary dissimilarity measure. We have used Euclidean distance, mp and PDM2 as the dissimilarity measure in k-medoids and compared the results with k-means. Our clustering results show that PDM2 has perfromed overally the best. This confirms our retrieval results and identifies PDM2 as a suitable dissimilarity measure for image retrieval and clustering.
- 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
Anti-war, radical youth revolt, Victoria, 1965-1975
- Authors: Butler, Nicholas
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis is a political history of the emergence and evolution of selected radical, left, student and workers movements in Victoria between 1965 and 1975. It examines the development of radical alliances, demonstrations and public actions using documentary materials and oral accounts provided during interviews. It argues that the radical left movement in Victoria began within the Monash University Labor Club, which subsequently generated radical groups outside the university. During this timeframe, both military conscription for the Vietnam War and the war itself became focal points for oppositional political mobilisation in Victoria. In 1967, the Monash Labor Club’s disruptive campaign against university authority was sufficiently popular for the club to turn its attention to disrupting the war effort. Soon, its locus of operations shifted into the general anti-war movement and the Labor Club established new, non-student, and avowedly communist and revolutionary organisations. Roughly termed the “Maoists,” by 1970 these organisations coalesced into the Worker Student Alliance (WSA), which grew rapidly to become a “left-wing” body that challenged the leadership of the established “left” organisations. The cessation of Australia’s involvement in the Vietnam War removed a major cause for radical action and, despite the generation of some important campaigns to replace it, the WSA dissolved itself in 1974.
- Description: Doctor of Philosophy
- Authors: Butler, Nicholas
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis is a political history of the emergence and evolution of selected radical, left, student and workers movements in Victoria between 1965 and 1975. It examines the development of radical alliances, demonstrations and public actions using documentary materials and oral accounts provided during interviews. It argues that the radical left movement in Victoria began within the Monash University Labor Club, which subsequently generated radical groups outside the university. During this timeframe, both military conscription for the Vietnam War and the war itself became focal points for oppositional political mobilisation in Victoria. In 1967, the Monash Labor Club’s disruptive campaign against university authority was sufficiently popular for the club to turn its attention to disrupting the war effort. Soon, its locus of operations shifted into the general anti-war movement and the Labor Club established new, non-student, and avowedly communist and revolutionary organisations. Roughly termed the “Maoists,” by 1970 these organisations coalesced into the Worker Student Alliance (WSA), which grew rapidly to become a “left-wing” body that challenged the leadership of the established “left” organisations. The cessation of Australia’s involvement in the Vietnam War removed a major cause for radical action and, despite the generation of some important campaigns to replace it, the WSA dissolved itself in 1974.
- Description: Doctor of Philosophy
Assessing healthcare providers' performance with and without risk adjustment
- Authors: Morales-Silva, Daniel
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: This study focuses on how healthcare data can be used to draw comparisons between healthcare providers (surgeons or hospitals). Depending on the type of access to datasets, these comparisons can be done with or without risk adjustment. For us, risk adjustment refers to the use of patient-level information to explain variation in healthcare spending, resource utilisation and health outcomes. For unadjusted comparisons, we highlight the diagnostic potential that radar plots offer for reporting on outcome indicators. These outcome indicators were obtained from hospital admissions of patients undergoing certain surgical procedures. We address two drawbacks of radar plots: presence of missing information and order of indicators. By introducing a consolidated view at provider level, we define an uncomplicated ranking of providers which can be used to identify potential low and high performers. For risk adjusted comparisons, we introduce a novel and robust methodology that enables comparisons of healthcare providers across multiple hierarchies, namely, surgeons, teams, departments and hospitals, using a consistent approach. Our methodology puts the patient at the centre of the analysis, and thus, can be used for personalised predictions (e.g. expected length of stay, costs and probability of being transferred to intensive care unit). Our findings suggest that the observed variation in selected outcome indicators, such as length of stay and charges of healthcare providers, cannot be explained by patient characteristics alone. Importantly, we have also observed that the perceived performance, on selected outcome indicators, of providers can change substantially following risk adjustment. Healthcare is unique in that clinical expertise is essential in guiding decision making and in informing all statistical models that seek to describe patient outcomes. For future iterations of our models, we will seek greater clinical input.
- Description: Doctor of Philosophy
- Authors: Morales-Silva, Daniel
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: This study focuses on how healthcare data can be used to draw comparisons between healthcare providers (surgeons or hospitals). Depending on the type of access to datasets, these comparisons can be done with or without risk adjustment. For us, risk adjustment refers to the use of patient-level information to explain variation in healthcare spending, resource utilisation and health outcomes. For unadjusted comparisons, we highlight the diagnostic potential that radar plots offer for reporting on outcome indicators. These outcome indicators were obtained from hospital admissions of patients undergoing certain surgical procedures. We address two drawbacks of radar plots: presence of missing information and order of indicators. By introducing a consolidated view at provider level, we define an uncomplicated ranking of providers which can be used to identify potential low and high performers. For risk adjusted comparisons, we introduce a novel and robust methodology that enables comparisons of healthcare providers across multiple hierarchies, namely, surgeons, teams, departments and hospitals, using a consistent approach. Our methodology puts the patient at the centre of the analysis, and thus, can be used for personalised predictions (e.g. expected length of stay, costs and probability of being transferred to intensive care unit). Our findings suggest that the observed variation in selected outcome indicators, such as length of stay and charges of healthcare providers, cannot be explained by patient characteristics alone. Importantly, we have also observed that the perceived performance, on selected outcome indicators, of providers can change substantially following risk adjustment. Healthcare is unique in that clinical expertise is essential in guiding decision making and in informing all statistical models that seek to describe patient outcomes. For future iterations of our models, we will seek greater clinical input.
- Description: Doctor of Philosophy
Avenue and Arch : Ballarat's commemoration. How are community attitudes to war and peace reflected in the civic management of the Avenue of Honour and the Arch of Victory?
- Authors: Roberts, Philip
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis examines the importance of memory, commemoration, heritage and militarism in relation to Ballarat’s Avenue of Honour and Arch of Victory. Inspired by Ken Inglis and other historians who have analysed war commemoration, the thesis argues that, led by the Lucas clothing company, Ballarat civic leaders and community members commemorated the war service and sacrifice of local soldiers, airmen, sailors and nurses by planting the 22-kilometre Avenue during 1917–19 and by constructing the prominent Arch in 1920. Although Ballarat voted against conscription in 1916 and 1917 and was a ‘divided’ society, the Avenue and Arch were able to unite members of the local community. From the 1920s, through memory and mythology during the civic maintenance of the Avenue and Arch, Australian community attitudes to war and peace were reflected, and a determined effort was made to remember the service and sacrifice of military personnel for all Australian wars. Discussion of the need for peace remained in the background until recent years. Important influences on the civic management were the collective memory of the so-called Lucas Girls, a group of former female employees of the Lucas clothing company, and of the members of the Arch of Victory/Avenue of Honour Committee. Increasingly, the embracing of the Anzac legend and an emphasis on loss and grief was reflected in the civic management. By 2017 the Avenue and Arch were in pristine condition and, through the Garden of the Grieving Mother, had transformed to symbolise the importance of remembering the sacrifices and grief of war and the need for peace. The project was based on documentary research and oral history, using an examination of newspaper and other documentary accounts from 1917–2017, a study of Arch of Victory/Avenue of Honour Committee papers and conservation management plans, research of relevant books and articles, landscape fieldwork and interviews with 26 people.
- Description: Doctor of Philosophy
- Authors: Roberts, Philip
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis examines the importance of memory, commemoration, heritage and militarism in relation to Ballarat’s Avenue of Honour and Arch of Victory. Inspired by Ken Inglis and other historians who have analysed war commemoration, the thesis argues that, led by the Lucas clothing company, Ballarat civic leaders and community members commemorated the war service and sacrifice of local soldiers, airmen, sailors and nurses by planting the 22-kilometre Avenue during 1917–19 and by constructing the prominent Arch in 1920. Although Ballarat voted against conscription in 1916 and 1917 and was a ‘divided’ society, the Avenue and Arch were able to unite members of the local community. From the 1920s, through memory and mythology during the civic maintenance of the Avenue and Arch, Australian community attitudes to war and peace were reflected, and a determined effort was made to remember the service and sacrifice of military personnel for all Australian wars. Discussion of the need for peace remained in the background until recent years. Important influences on the civic management were the collective memory of the so-called Lucas Girls, a group of former female employees of the Lucas clothing company, and of the members of the Arch of Victory/Avenue of Honour Committee. Increasingly, the embracing of the Anzac legend and an emphasis on loss and grief was reflected in the civic management. By 2017 the Avenue and Arch were in pristine condition and, through the Garden of the Grieving Mother, had transformed to symbolise the importance of remembering the sacrifices and grief of war and the need for peace. The project was based on documentary research and oral history, using an examination of newspaper and other documentary accounts from 1917–2017, a study of Arch of Victory/Avenue of Honour Committee papers and conservation management plans, research of relevant books and articles, landscape fieldwork and interviews with 26 people.
- Description: Doctor of Philosophy
Beyond the natural : perceptions of spirituality and spiritual nurturing in volunteer pastoral care workers in christian ministry : implications for training
- Job, Kay
- Authors: Job, Kay
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Practical and evidence-based research is scarce regarding the perceptions of spirituality and spiritual nurturing of volunteer pastoral care workers. This study set out to explore perceptions of spirituality and spiritual nurturing of volunteer pastoral care workers in a Christian ministry. The aim was to identify what influence their spirituality had on ministry, whether there were links between spiritual experiences, spiritual nurturing and spiritual growth and to develop relevant recommendations to improve training and praxis within the field of pastoral care, an area of increasing interest and demand within the Christian tradition. Thirty participants from an interdenominational volunteer ministry in the Christian tradition, Victorious Ministry Through Christ (VMTC), were interviewed and data were analysed using principles of Grounded Theory to inform subjective spiritual experiences and discover themes regarding spiritual awareness, sensitivity, and effective practice. There were strong indications that a totally dependent, reciprocal relationship exists between spirituality and the ability to minister, suggesting a negation of ability could occur by an absence, unawareness of, or disengagement from the existence of a spiritual dimension. The extent to which an individual was able to effectively and sensitively offer pastoral care was dependent on the degree to which properties of Substantive Spirituality were appropriated, demonstrated through strands of spiritual Sensibility, capacity for Reciprocity, and response to Modification, which combined to form Integrative Spiritual Function (ISF). ISF supported mature functioning of the individual personally, was pre-eminent to formation and effective ministry, and integrative for the whole person. ISF also informed the development of SIFTable; an example of an appraisal tool for use in pastoral care contexts to gauge competency. Recommendations regarding thoughtful and appropriate training of volunteer pastoral care personnel may assist in the formative process associated with ministry to ensure a holistic response to pastoral needs of the volunteer, and the recipient of ministry.
- Description: Doctor of Philosophy
- Authors: Job, Kay
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Practical and evidence-based research is scarce regarding the perceptions of spirituality and spiritual nurturing of volunteer pastoral care workers. This study set out to explore perceptions of spirituality and spiritual nurturing of volunteer pastoral care workers in a Christian ministry. The aim was to identify what influence their spirituality had on ministry, whether there were links between spiritual experiences, spiritual nurturing and spiritual growth and to develop relevant recommendations to improve training and praxis within the field of pastoral care, an area of increasing interest and demand within the Christian tradition. Thirty participants from an interdenominational volunteer ministry in the Christian tradition, Victorious Ministry Through Christ (VMTC), were interviewed and data were analysed using principles of Grounded Theory to inform subjective spiritual experiences and discover themes regarding spiritual awareness, sensitivity, and effective practice. There were strong indications that a totally dependent, reciprocal relationship exists between spirituality and the ability to minister, suggesting a negation of ability could occur by an absence, unawareness of, or disengagement from the existence of a spiritual dimension. The extent to which an individual was able to effectively and sensitively offer pastoral care was dependent on the degree to which properties of Substantive Spirituality were appropriated, demonstrated through strands of spiritual Sensibility, capacity for Reciprocity, and response to Modification, which combined to form Integrative Spiritual Function (ISF). ISF supported mature functioning of the individual personally, was pre-eminent to formation and effective ministry, and integrative for the whole person. ISF also informed the development of SIFTable; an example of an appraisal tool for use in pastoral care contexts to gauge competency. Recommendations regarding thoughtful and appropriate training of volunteer pastoral care personnel may assist in the formative process associated with ministry to ensure a holistic response to pastoral needs of the volunteer, and the recipient of ministry.
- Description: Doctor of Philosophy
Beyond the princess, the priestess and the galactic kitchen sink: Reformulation of feminine roles in certain work of Lois McMaster Bujold
- Authors: Herington, Caitlin
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: In this thesis I examine the Science Fiction and Fantasy works of Lois McMaster Bujold in the Vorkosigan Series and Chalion Series, in particular the way she reformulates women’s roles and identities in society through the characters presented in these novels. I use the term Speculative Fiction as an umbrella term that encompasses both Science Fiction and Fantasy as modes of speculation, in that they both rely on extrapolation and estrangement as narrative features. My main proposition is that Bujold is an important transitional figure in speculative fiction between second and third wave feminist thinking. Although her work mimics some distinctive features of speculative fiction that utilise patriarchal structures and traditional gender norms, it is not limited by them. As a result, Bujold conveys a more complex and insightful understanding of gender. The research method of this thesis is the close reading of a range of sample texts from Bujold’s Vorkosigan Series and Chalion Series which feature female protagonists. I seek to explore the discussion of gender relations and reformulation that occurs within them in the context of both speculative and feminist criticism. Bujold’s exploration of the identities and social roles of women in these fictional worlds is complex and challenging, using a range of approaches from simple reversal, to hybridity of gender, to more complex partial positions. This thesis argues that she takes an implicitly feminist approach, focussing on female experiences and examining the modes of social control and exercise of power within patriarchal social structures as they impact on women. Science Fiction and Fantasy often seem to reiterate traditional patriarchal hierarchies. Validating gender norms that conform to social expectations rather than challenging them. Bujold is presented in this thesis as utilising established norms and tropes such that her texts are easily identified as examples of Science Fiction and Fantasy, but in other ways her reformulations present radical challenges to cultural expectations of gender. This thesis reveals that social critique and reformulation of gender roles is possible and powerful in both Science Fiction and Fantasy by examining the work of a significant author whose work has lacked critical attention until recently. Although numerous studies have examined the way gender has been treated in Science Fiction and Fantasy, the unique contribution of this thesis is to examine an author previously under-studied and to consider the patterns of these reformulations as expressed in Bujold’s works.
- Description: Doctor of Philosophy
- Authors: Herington, Caitlin
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: In this thesis I examine the Science Fiction and Fantasy works of Lois McMaster Bujold in the Vorkosigan Series and Chalion Series, in particular the way she reformulates women’s roles and identities in society through the characters presented in these novels. I use the term Speculative Fiction as an umbrella term that encompasses both Science Fiction and Fantasy as modes of speculation, in that they both rely on extrapolation and estrangement as narrative features. My main proposition is that Bujold is an important transitional figure in speculative fiction between second and third wave feminist thinking. Although her work mimics some distinctive features of speculative fiction that utilise patriarchal structures and traditional gender norms, it is not limited by them. As a result, Bujold conveys a more complex and insightful understanding of gender. The research method of this thesis is the close reading of a range of sample texts from Bujold’s Vorkosigan Series and Chalion Series which feature female protagonists. I seek to explore the discussion of gender relations and reformulation that occurs within them in the context of both speculative and feminist criticism. Bujold’s exploration of the identities and social roles of women in these fictional worlds is complex and challenging, using a range of approaches from simple reversal, to hybridity of gender, to more complex partial positions. This thesis argues that she takes an implicitly feminist approach, focussing on female experiences and examining the modes of social control and exercise of power within patriarchal social structures as they impact on women. Science Fiction and Fantasy often seem to reiterate traditional patriarchal hierarchies. Validating gender norms that conform to social expectations rather than challenging them. Bujold is presented in this thesis as utilising established norms and tropes such that her texts are easily identified as examples of Science Fiction and Fantasy, but in other ways her reformulations present radical challenges to cultural expectations of gender. This thesis reveals that social critique and reformulation of gender roles is possible and powerful in both Science Fiction and Fantasy by examining the work of a significant author whose work has lacked critical attention until recently. Although numerous studies have examined the way gender has been treated in Science Fiction and Fantasy, the unique contribution of this thesis is to examine an author previously under-studied and to consider the patterns of these reformulations as expressed in Bujold’s works.
- Description: Doctor of Philosophy
Canonical dual finite element method for solving nonconvex mechanics and topology optimization
- Authors: Ali, Elaf
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Canonical duality theory (CDT) is a newly developed, potentially powerful methodological theory which can transfer general multi-scale nonconvex/discrete problems in Rn to a unified convex dual problem in continuous space Rm with m n and without a duality gap. The associated triality theory provides extremality criteria for both global and local optimal solutions, which can be used to develop powerful algorithms for solving general nonconvex variational problems. This thesis, first, presents a detailed study of large deformation problems in 2-D structural system. Based on the canonical duality theory, a canonical dual finite element method is applied to find a global minimization to the general nonconvex optimization problem using a new primal-dual semi-definite programming algorithm. Applications are illustrated by numerical examples with different structural designs and different external loads. Next, a new methodology and algorithm for solving post buckling problems of a large deformed elastic beam is investigated. The total potential energy of this beam is a nonconvex functional, which can be used to model both pre- and post-buckling phenomena. By using the canonical dual finite element method, a new primal-dual semi-definite programming algorithm is presented, which can be used to obtain all possible post-buckled solutions. In order to verify the triality theory, mixed meshes of different dual stress interpolation are applied to obtain the closed dimensions between discretized displacement and discretized stress. Applications are illustrated by several numerical examples with different boundary conditions. We find that the global minimum solution of the nonconvex potential leads to the unbuckled state, and both of these two solutions are numerically stable. However, the local minimum solution leads to an unstable buckled state, which is very sensitive to the external load, thickness of the beam, numerical precision, and the size of finite elements. Finally, a mathematically rigorous and computationally powerful method for solving 3-D topology optimization problems is demonstrated. This method is based on CDT developed by Gao in nonconvex mechanics and global optimization. It shows that the so-called NP-hard Knapsack problem in topology optimization can be solved deterministically in polynomial-time via a canonical penalty-duality (CPD) method to obtain precise global optimal 0-1 density distribution at each volume evolution. The relation between this CPD method and Gao's pure complementary energy principle is revealed for the first time. A CPD algorithm is proposed for 3-D topology optimization of linear elastic structures. Its novelty is demonstrated by benchmark problems. Results show that without using any artificial technique, the CPD method can provide mechanically sound optimal design, also it is much more powerful than the well-known BESO and SIMP methods. Finally, computational complexity and conceptual/mathematical mistakes in topology optimization modeling and popular methods are explicitly addressed.
- Description: Doctor of Philosophy
- Description: Canonical duality theory (CDT) is a newly developed, potentially powerful method- ological theory which can transfer general multi-scale nonconvex/discrete problems in Rn to a unified convex dual problem in continuous space Rm with m
- Authors: Ali, Elaf
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Canonical duality theory (CDT) is a newly developed, potentially powerful methodological theory which can transfer general multi-scale nonconvex/discrete problems in Rn to a unified convex dual problem in continuous space Rm with m n and without a duality gap. The associated triality theory provides extremality criteria for both global and local optimal solutions, which can be used to develop powerful algorithms for solving general nonconvex variational problems. This thesis, first, presents a detailed study of large deformation problems in 2-D structural system. Based on the canonical duality theory, a canonical dual finite element method is applied to find a global minimization to the general nonconvex optimization problem using a new primal-dual semi-definite programming algorithm. Applications are illustrated by numerical examples with different structural designs and different external loads. Next, a new methodology and algorithm for solving post buckling problems of a large deformed elastic beam is investigated. The total potential energy of this beam is a nonconvex functional, which can be used to model both pre- and post-buckling phenomena. By using the canonical dual finite element method, a new primal-dual semi-definite programming algorithm is presented, which can be used to obtain all possible post-buckled solutions. In order to verify the triality theory, mixed meshes of different dual stress interpolation are applied to obtain the closed dimensions between discretized displacement and discretized stress. Applications are illustrated by several numerical examples with different boundary conditions. We find that the global minimum solution of the nonconvex potential leads to the unbuckled state, and both of these two solutions are numerically stable. However, the local minimum solution leads to an unstable buckled state, which is very sensitive to the external load, thickness of the beam, numerical precision, and the size of finite elements. Finally, a mathematically rigorous and computationally powerful method for solving 3-D topology optimization problems is demonstrated. This method is based on CDT developed by Gao in nonconvex mechanics and global optimization. It shows that the so-called NP-hard Knapsack problem in topology optimization can be solved deterministically in polynomial-time via a canonical penalty-duality (CPD) method to obtain precise global optimal 0-1 density distribution at each volume evolution. The relation between this CPD method and Gao's pure complementary energy principle is revealed for the first time. A CPD algorithm is proposed for 3-D topology optimization of linear elastic structures. Its novelty is demonstrated by benchmark problems. Results show that without using any artificial technique, the CPD method can provide mechanically sound optimal design, also it is much more powerful than the well-known BESO and SIMP methods. Finally, computational complexity and conceptual/mathematical mistakes in topology optimization modeling and popular methods are explicitly addressed.
- Description: Doctor of Philosophy
- Description: Canonical duality theory (CDT) is a newly developed, potentially powerful method- ological theory which can transfer general multi-scale nonconvex/discrete problems in Rn to a unified convex dual problem in continuous space Rm with m
Characterisation of the deformation behaviour of unbound granular materials using repeated load triaxial testing
- Authors: Zhalehjoo, Negin
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Unbound Granular Materials (UGMs) are used in the base/subbase layers of flexible pavements for the majority of roads around the world. The deterioration of pavements increases with the increase of traffic loadings. To ensure the long-term performance and serviceability of pavement structures through a realistic design, the precise evaluation and comprehensive characterisation of the resilient and permanent deformation behaviour of pavement materials are essential. The present PhD study aims to investigate the characterisation of the resilient and permanent deformation behaviour of four road base UGMs sourced from quarries in Victoria, Australia, using Repeated Load Triaxial (RLT) testing. The triaxial system used in this study is instrumented with four axial deformation measurement transducers to achieve highly precise measurements and to evaluate the effect of instrumentation on the resilient modulus of UGMs. The resilient Poisson’s ratio of the studied UGMs is also determined using a radial Hall-Effect transducer. Moreover, a series of permanent deformation tests is performed to precisely characterise the axial and radial permanent deformation behaviour of UGMs and investigate the factors that may significantly influence the accumulated axial and radial permanent deformations. Finally, three permanent deformation models incorporated with a time-hardening procedure are employed to predict the magnitude of permanent strain for multiple stress levels of the RLT test. The predictions using the employed models are then compared against the measured values to evaluate the suitability of the models and to identify the model that best predicts the strain accumulation behaviour of the tested UGMs. While this study focuses on the resilient and permanent deformation behaviour of four Victorian UGMs under repeated loading, the knowledge generated from this comprehensive investigation will contribute towards the global development of more reliable methods for evaluating the long-term performance of pavement structures and minimising road maintenance and repair costs.
- Description: Doctor of Philosophy
- Authors: Zhalehjoo, Negin
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Unbound Granular Materials (UGMs) are used in the base/subbase layers of flexible pavements for the majority of roads around the world. The deterioration of pavements increases with the increase of traffic loadings. To ensure the long-term performance and serviceability of pavement structures through a realistic design, the precise evaluation and comprehensive characterisation of the resilient and permanent deformation behaviour of pavement materials are essential. The present PhD study aims to investigate the characterisation of the resilient and permanent deformation behaviour of four road base UGMs sourced from quarries in Victoria, Australia, using Repeated Load Triaxial (RLT) testing. The triaxial system used in this study is instrumented with four axial deformation measurement transducers to achieve highly precise measurements and to evaluate the effect of instrumentation on the resilient modulus of UGMs. The resilient Poisson’s ratio of the studied UGMs is also determined using a radial Hall-Effect transducer. Moreover, a series of permanent deformation tests is performed to precisely characterise the axial and radial permanent deformation behaviour of UGMs and investigate the factors that may significantly influence the accumulated axial and radial permanent deformations. Finally, three permanent deformation models incorporated with a time-hardening procedure are employed to predict the magnitude of permanent strain for multiple stress levels of the RLT test. The predictions using the employed models are then compared against the measured values to evaluate the suitability of the models and to identify the model that best predicts the strain accumulation behaviour of the tested UGMs. While this study focuses on the resilient and permanent deformation behaviour of four Victorian UGMs under repeated loading, the knowledge generated from this comprehensive investigation will contribute towards the global development of more reliable methods for evaluating the long-term performance of pavement structures and minimising road maintenance and repair costs.
- Description: Doctor of Philosophy
Cognitive behaviour therapy for insomnia and depression among older adults : A mixed methods randomised controlled clinical trial
- Authors: Sadler, Paul
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Background A strong relationship exists between insomnia and depression, particularly among older adults (aged 65 years and older). Recently experts in the field of behavioural sleep medicine established cognitive behaviour therapy (CBT) was an effective treatment for comorbid insomnia, however, it was unknown whether cognitive behaviour therapy for insomnia (CBT-I) benefitted older adults with co-occurring depression (literature review published in Cognitive Behaviour Therapy). A mixed-methods randomised controlled clinical trial (RCT) was warranted within a community mental health setting to investigate the efficacy of CBT-I for older adults with comorbid insomnia and depression. Furthermore, no study had tested whether an advanced form of CBT-I that included additional positive mood-enhancing strategies produced better outcomes compared to a standard form of CBT-I that only targeted insomnia. It was anticipated that the results from such a trial could influence the evolution of treatment for older adults with these highly prevalent comorbid conditions. Methodology An RCT was conducted between 2014 and 2016 across Victoria, Australia, through Latrobe Regional Hospital‟s and Peninsula Health‟s Community Mental Health Services (protocol published in Trials). Seventy-two older adults with diagnosed comorbid insomnia and depression were randomly assigned to one of three group therapy conditions: cognitive behaviour therapy for insomnia (CBT-I, standard), cognitive behaviour therapy for insomnia plus positive mood strategies (CBT-I+, advanced), psychoeducation control group (PCG, control). The primary outcomes were insomnia severity (Insomnia Severity Index) and depression severity (Geriatric Depression Scale). Primary and secondary measures were collected at pre (week 0), post (week 8), and follow-up (week 20). Participants who completed the experiential conditions were invited to provide feedback in the form of semi- xvii structured focus groups following the final session of treatment. Thirty-one participants from six groups reflected on their experiences of participating in CBT-I and CBT-I+. Results Quantitative analyses demonstrated the experiential CBT conditions both generated significantly greater reductions in insomnia and depression severity compared to PCG from pre to post, which were maintained at follow-up. The standard and advanced conditions showed similar reductions on insomnia and depression severity at post and follow up. These results were also consistent for the secondary measures across conditions. Both active treatments demonstrated large effect sizes, high retention, and strong remission rates for older adults with insomnia and depression (published in journal SLEEP). A qualitative analysis was also conducted to explore the participants‟ experiences of treatment. Interview data from the reflective focus groups was transcribed into 424 sentences and 60 codes were extracted. Thirty-four initial themes emerged, which were finally transformed into 3 themes and 10 subthemes. The three themes were (1) positive experiences, (2) negative experiences, and (3) suggested modifications. The positive subthemes were (1a) therapists, (1b) togetherness, (1c) use of strategies reduced symptoms, and (1d) acceptance. The negative subthemes were (2a) persistent symptoms, (2b) program too condensed, and (2c) attendance obstacles. The suggested modifications were (3a) lengthen program, (3b) multi-dimensional learning, and (3c) multi-modal delivery options (manuscript under review in Aging and Mental Health). Conclusion This is the first RCT to demonstrate that specifically treating comorbid insomnia with CBT has an additional positive effect of improving depression for older adults with multiple comorbidities. Both CBT programs were effective at reducing insomnia and depression severity for older adults with comorbidity. Replication of this study is necessary with a larger sample size to conclusively establish whether the two interventions have different or equivalent effects. It was suggested mental health services that deliver treatment for comorbid insomnia with CBT may improve recovery outcomes for older adults with depression. Future CBT-I programs for older adults may be improved by increasing the length of therapy (e.g., 8 sessions to 12 sessions), adding multi-dimensional learning opportunities (e.g., visual/audio/mentorship), and offering various modes of treatment delivery (e.g., group, individual, internet, telephone).
- Description: Doctor of Philosophy
- Authors: Sadler, Paul
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Background A strong relationship exists between insomnia and depression, particularly among older adults (aged 65 years and older). Recently experts in the field of behavioural sleep medicine established cognitive behaviour therapy (CBT) was an effective treatment for comorbid insomnia, however, it was unknown whether cognitive behaviour therapy for insomnia (CBT-I) benefitted older adults with co-occurring depression (literature review published in Cognitive Behaviour Therapy). A mixed-methods randomised controlled clinical trial (RCT) was warranted within a community mental health setting to investigate the efficacy of CBT-I for older adults with comorbid insomnia and depression. Furthermore, no study had tested whether an advanced form of CBT-I that included additional positive mood-enhancing strategies produced better outcomes compared to a standard form of CBT-I that only targeted insomnia. It was anticipated that the results from such a trial could influence the evolution of treatment for older adults with these highly prevalent comorbid conditions. Methodology An RCT was conducted between 2014 and 2016 across Victoria, Australia, through Latrobe Regional Hospital‟s and Peninsula Health‟s Community Mental Health Services (protocol published in Trials). Seventy-two older adults with diagnosed comorbid insomnia and depression were randomly assigned to one of three group therapy conditions: cognitive behaviour therapy for insomnia (CBT-I, standard), cognitive behaviour therapy for insomnia plus positive mood strategies (CBT-I+, advanced), psychoeducation control group (PCG, control). The primary outcomes were insomnia severity (Insomnia Severity Index) and depression severity (Geriatric Depression Scale). Primary and secondary measures were collected at pre (week 0), post (week 8), and follow-up (week 20). Participants who completed the experiential conditions were invited to provide feedback in the form of semi- xvii structured focus groups following the final session of treatment. Thirty-one participants from six groups reflected on their experiences of participating in CBT-I and CBT-I+. Results Quantitative analyses demonstrated the experiential CBT conditions both generated significantly greater reductions in insomnia and depression severity compared to PCG from pre to post, which were maintained at follow-up. The standard and advanced conditions showed similar reductions on insomnia and depression severity at post and follow up. These results were also consistent for the secondary measures across conditions. Both active treatments demonstrated large effect sizes, high retention, and strong remission rates for older adults with insomnia and depression (published in journal SLEEP). A qualitative analysis was also conducted to explore the participants‟ experiences of treatment. Interview data from the reflective focus groups was transcribed into 424 sentences and 60 codes were extracted. Thirty-four initial themes emerged, which were finally transformed into 3 themes and 10 subthemes. The three themes were (1) positive experiences, (2) negative experiences, and (3) suggested modifications. The positive subthemes were (1a) therapists, (1b) togetherness, (1c) use of strategies reduced symptoms, and (1d) acceptance. The negative subthemes were (2a) persistent symptoms, (2b) program too condensed, and (2c) attendance obstacles. The suggested modifications were (3a) lengthen program, (3b) multi-dimensional learning, and (3c) multi-modal delivery options (manuscript under review in Aging and Mental Health). Conclusion This is the first RCT to demonstrate that specifically treating comorbid insomnia with CBT has an additional positive effect of improving depression for older adults with multiple comorbidities. Both CBT programs were effective at reducing insomnia and depression severity for older adults with comorbidity. Replication of this study is necessary with a larger sample size to conclusively establish whether the two interventions have different or equivalent effects. It was suggested mental health services that deliver treatment for comorbid insomnia with CBT may improve recovery outcomes for older adults with depression. Future CBT-I programs for older adults may be improved by increasing the length of therapy (e.g., 8 sessions to 12 sessions), adding multi-dimensional learning opportunities (e.g., visual/audio/mentorship), and offering various modes of treatment delivery (e.g., group, individual, internet, telephone).
- Description: Doctor of Philosophy
Decision making processes within educated intercultural marriages in Australia
- Authors: Alnaimi, Suleiman
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: In recent years, the world–wide phenomena of globalization and increasingly flexible social norms have contributed to an increase in intercultural relationships, particularly in multicultural societies. Intercultural relationships have a higher risk of failure and lower marital satisfaction than same-culture marriages. The negotiation of important family decisions are known to lead to marital conflict, however few studies have examined how successful, intercultural couples make important decisions and maintain marital satisfaction. Six intercultural couples who met the criteria were recruited and interviewed (ie.12 individuals).Couples were interviewed longitudinally on how they make important family decisions. The educational levels of participants ranged from college degree to PhD degree. The participants represented diverse cultural backgrounds. The various racial and/or ethnic identifications of the intercultural married couples in this study represented the diversity of the racial and/or ethnic mixes in intercultural marriages within the general population. Prior to completing the conjoint, face to face interviews, each couple completed the Schwartz Value Survey to elicit their individual values. Values are known to motivate and underpin decisions and vary from culture to culture. Interviews revealed that, although cultural differences were clearly evident, these differences did not prevent effective decision making amongst intercultural couples. Instead, couples were successfully turning cultural differences into minor issues or even opportunities. Couples often managed three cultures within the nuclear family as all couples had children being raised in Australia. Couples reported that keys to marital success included developing common values, working towards agreed goals and awareness of their spouse’s culture, support and open communication. Intercultural couples interviewed displayed positive attitudes of commitment to their marriage, each other and family. Couples focused on what was best for the family when making decisions. They held firm beliefs that they were not that different from their partner, despite cultural differences. Themes to emerge from qualitative analysis of the interviews as factors underpinning successful inter-cultural marriages across the participants include shared faith, similar values and the creation of a third culture within an emerging global culture. Cultural differences were not found to be a significant factor when major family decisions were made. This thesis is the first to examine decision making among successful intercultural couples. Qualitative study has investigated couple decision-making from the same cultural background. This current study generates new insights on intercultural couple’s decision making processes, and provides unique perspectives on how successful, well-adjusted and highly educated intercultural couples negotiate important family decisions. The findings of this study have the potential to add to the limited knowledge available on intercultural marriage and cross-cultural adjustment and has implications for counsellors and marriage / family therapists working with cross-cultural couples.
- Description: Doctor of Philosophy
- Authors: Alnaimi, Suleiman
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: In recent years, the world–wide phenomena of globalization and increasingly flexible social norms have contributed to an increase in intercultural relationships, particularly in multicultural societies. Intercultural relationships have a higher risk of failure and lower marital satisfaction than same-culture marriages. The negotiation of important family decisions are known to lead to marital conflict, however few studies have examined how successful, intercultural couples make important decisions and maintain marital satisfaction. Six intercultural couples who met the criteria were recruited and interviewed (ie.12 individuals).Couples were interviewed longitudinally on how they make important family decisions. The educational levels of participants ranged from college degree to PhD degree. The participants represented diverse cultural backgrounds. The various racial and/or ethnic identifications of the intercultural married couples in this study represented the diversity of the racial and/or ethnic mixes in intercultural marriages within the general population. Prior to completing the conjoint, face to face interviews, each couple completed the Schwartz Value Survey to elicit their individual values. Values are known to motivate and underpin decisions and vary from culture to culture. Interviews revealed that, although cultural differences were clearly evident, these differences did not prevent effective decision making amongst intercultural couples. Instead, couples were successfully turning cultural differences into minor issues or even opportunities. Couples often managed three cultures within the nuclear family as all couples had children being raised in Australia. Couples reported that keys to marital success included developing common values, working towards agreed goals and awareness of their spouse’s culture, support and open communication. Intercultural couples interviewed displayed positive attitudes of commitment to their marriage, each other and family. Couples focused on what was best for the family when making decisions. They held firm beliefs that they were not that different from their partner, despite cultural differences. Themes to emerge from qualitative analysis of the interviews as factors underpinning successful inter-cultural marriages across the participants include shared faith, similar values and the creation of a third culture within an emerging global culture. Cultural differences were not found to be a significant factor when major family decisions were made. This thesis is the first to examine decision making among successful intercultural couples. Qualitative study has investigated couple decision-making from the same cultural background. This current study generates new insights on intercultural couple’s decision making processes, and provides unique perspectives on how successful, well-adjusted and highly educated intercultural couples negotiate important family decisions. The findings of this study have the potential to add to the limited knowledge available on intercultural marriage and cross-cultural adjustment and has implications for counsellors and marriage / family therapists working with cross-cultural couples.
- Description: Doctor of Philosophy
Effective and efficient kernel-based image representations for classification and retrieval
- Authors: Karmakar, Priyabrata
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Image representation is a challenging task. In particular, in order to obtain better performances in different image processing applications such as video surveillance, autonomous driving, crime scene detection and automatic inspection, effective and efficient image representation is a fundamental need. The performance of these applications usually depends on how accurately images are classified into their corresponding groups or how precisely relevant images are retrieved from a database based on a query. Accuracy in image classification and precision in image retrieval depend on the effectiveness of image representation. Existing image representation methods have some limitations. For example, spatial pyramid matching, which is a popular method incorporating spatial information in image-level representation, has not been fully studied to date. In addition, the strengths of pyramid match kernel and spatial pyramid matching are not combined for better image matching. Kernel descriptors based on gradient, colour and shape overcome the limitations of histogram-based descriptors, but suffer from information loss, noise effects and high computational complexity. Furthermore, the combined performance of kernel descriptors has limitations related to computational complexity, higher dimensionality and lower effectiveness. Moreover, the potential of a global texture descriptor which is based on human visual perception has not been fully explored to date. Therefore, in this research project, kernel-based effective and efficient image representation methods are proposed to address the above limitations. An enhancement is made to spatial pyramid matching in terms of improved rotation invariance. This is done by investigating different partitioning schemes suitable to achieve rotation-invariant image representation and the proposal of a weight function for appropriate level contribution in image matching. In addition, the strengths of pyramid match kernel and spatial pyramid are combined to enhance matching accuracy between images. The existing kernel descriptors are modified and improved to achieve greater effectiveness, minimum noise effects, less dimensionality and lower computational complexity. A novel fusion approach is also proposed to combine the information related to all pixel attributes, before the descriptor extraction stage. Existing kernel descriptors are based only on gradient, colour and shape information. In this research project, a texture-based kernel descriptor is proposed by modifying an existing popular global texture descriptor. Finally, all the contributions are evaluated in an integrated system. The performances of the proposed methods are qualitatively and quantitatively evaluated on two to four different publicly available image databases. The experimental results show that the proposed methods are more effective and efficient in image representation than existing benchmark methods.
- Description: Doctor of Philosophy
- Authors: Karmakar, Priyabrata
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Image representation is a challenging task. In particular, in order to obtain better performances in different image processing applications such as video surveillance, autonomous driving, crime scene detection and automatic inspection, effective and efficient image representation is a fundamental need. The performance of these applications usually depends on how accurately images are classified into their corresponding groups or how precisely relevant images are retrieved from a database based on a query. Accuracy in image classification and precision in image retrieval depend on the effectiveness of image representation. Existing image representation methods have some limitations. For example, spatial pyramid matching, which is a popular method incorporating spatial information in image-level representation, has not been fully studied to date. In addition, the strengths of pyramid match kernel and spatial pyramid matching are not combined for better image matching. Kernel descriptors based on gradient, colour and shape overcome the limitations of histogram-based descriptors, but suffer from information loss, noise effects and high computational complexity. Furthermore, the combined performance of kernel descriptors has limitations related to computational complexity, higher dimensionality and lower effectiveness. Moreover, the potential of a global texture descriptor which is based on human visual perception has not been fully explored to date. Therefore, in this research project, kernel-based effective and efficient image representation methods are proposed to address the above limitations. An enhancement is made to spatial pyramid matching in terms of improved rotation invariance. This is done by investigating different partitioning schemes suitable to achieve rotation-invariant image representation and the proposal of a weight function for appropriate level contribution in image matching. In addition, the strengths of pyramid match kernel and spatial pyramid are combined to enhance matching accuracy between images. The existing kernel descriptors are modified and improved to achieve greater effectiveness, minimum noise effects, less dimensionality and lower computational complexity. A novel fusion approach is also proposed to combine the information related to all pixel attributes, before the descriptor extraction stage. Existing kernel descriptors are based only on gradient, colour and shape information. In this research project, a texture-based kernel descriptor is proposed by modifying an existing popular global texture descriptor. Finally, all the contributions are evaluated in an integrated system. The performances of the proposed methods are qualitatively and quantitatively evaluated on two to four different publicly available image databases. The experimental results show that the proposed methods are more effective and efficient in image representation than existing benchmark methods.
- Description: Doctor of Philosophy