Global optimality conditions and optimization methods for polynomial programming problems and their applications
- Authors: Tian, Jing
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: The polynomial programming problem which has a polynomial objective function, either with no constraints or with polynomial constraints occurs frequently in engineering design, investment science, control theory, network distribution, signal processing and locationallocation contexts. Moreover, the polynomial programming problem is known to be Nondeterministic Polynomial-time hard (NP-hard). The polynomial programming problem has attracted a lot of attention, including quadratic, cubic, homogenous or normal quartic programming problems as special cases. Existing methods for solving polynomial programming problems include algebraic methods and various convex relaxation methods. Especially, among these methods, semidefinite programming (SDP) and sum of squares (SOS) relaxations are very popular. Theoretically, SDP and SOS relaxation methods are very powerful and successful in solving the general polynomial programming problem with a compact feasible region. However, the solvability in practice depends on the size or the degree of the polynomial programming problem and the required accuracy. Hence, solving large scale SDP problems still remains a computational challenge. It is well-known that traditional local optimization methods are designed based on necessary local optimality conditions, i.e., Karush-Kuhn-Tucker (KKT) conditions. Motivated by this, some researchers proposed a necessary global optimality condition for a quadratic programming problem and designed a new local optimization method according to the necessary global optimality condition. In this thesis, we try to apply this idea to cubic and quatic programming problems, and further to general unconstrained and constrained polynomial programming problems. For these polynomial programming problems, we will investigate necessary global optimality conditions and design new local optimization methods according to these conditions. These necessary global optimality conditions are generally stronger than KKT conditions. Hence, the obtained new local minimizers by using the new local optimization methods may improve some KKT points. Our ultimate aim is to design global optimization methods for these polynomial programming problems. We notice that the filled function method is one of the well-known and practical auxiliary function methods used to achieve a global minimizer. In this thesis, we design global optimization methods by combining the new proposed local optimization methods and some auxiliary functions. The numerical examples illustrate the efficiency and stability of the optimization methods. Finally, we discuss some applications for solving some sensor network localization problems and systems of polynomial equations. It is worth mentioning that we apply the idea and the results for polynomial programming problems to nonlinear programming problems (NLP). We provide an optimality condition and design new local optimization methods according to the optimality condition and design global optimization methods for the problem (NLP) by combining the new local optimization methods and an auxiliary function. In order to test the performance of the global optimization methods, we compare them with two other heuristic methods. The results demonstrate our methods outperform the two other algorithms.
- Description: Doctor of Philosophy
- Authors: Tian, Jing
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: The polynomial programming problem which has a polynomial objective function, either with no constraints or with polynomial constraints occurs frequently in engineering design, investment science, control theory, network distribution, signal processing and locationallocation contexts. Moreover, the polynomial programming problem is known to be Nondeterministic Polynomial-time hard (NP-hard). The polynomial programming problem has attracted a lot of attention, including quadratic, cubic, homogenous or normal quartic programming problems as special cases. Existing methods for solving polynomial programming problems include algebraic methods and various convex relaxation methods. Especially, among these methods, semidefinite programming (SDP) and sum of squares (SOS) relaxations are very popular. Theoretically, SDP and SOS relaxation methods are very powerful and successful in solving the general polynomial programming problem with a compact feasible region. However, the solvability in practice depends on the size or the degree of the polynomial programming problem and the required accuracy. Hence, solving large scale SDP problems still remains a computational challenge. It is well-known that traditional local optimization methods are designed based on necessary local optimality conditions, i.e., Karush-Kuhn-Tucker (KKT) conditions. Motivated by this, some researchers proposed a necessary global optimality condition for a quadratic programming problem and designed a new local optimization method according to the necessary global optimality condition. In this thesis, we try to apply this idea to cubic and quatic programming problems, and further to general unconstrained and constrained polynomial programming problems. For these polynomial programming problems, we will investigate necessary global optimality conditions and design new local optimization methods according to these conditions. These necessary global optimality conditions are generally stronger than KKT conditions. Hence, the obtained new local minimizers by using the new local optimization methods may improve some KKT points. Our ultimate aim is to design global optimization methods for these polynomial programming problems. We notice that the filled function method is one of the well-known and practical auxiliary function methods used to achieve a global minimizer. In this thesis, we design global optimization methods by combining the new proposed local optimization methods and some auxiliary functions. The numerical examples illustrate the efficiency and stability of the optimization methods. Finally, we discuss some applications for solving some sensor network localization problems and systems of polynomial equations. It is worth mentioning that we apply the idea and the results for polynomial programming problems to nonlinear programming problems (NLP). We provide an optimality condition and design new local optimization methods according to the optimality condition and design global optimization methods for the problem (NLP) by combining the new local optimization methods and an auxiliary function. In order to test the performance of the global optimization methods, we compare them with two other heuristic methods. The results demonstrate our methods outperform the two other algorithms.
- Description: Doctor of Philosophy
Hyperbolic smoothing in nonsmooth optimization and applications
- Authors: Al Nuaimat, Alia
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Nonsmooth nonconvex optimization problems arise in many applications including economics, business and data mining. In these applications objective functions are not necessarily differentiable or convex. Many algorithms have been proposed over the past three decades to solve such problems. In spite of the significant growth in this field, the development of efficient algorithms for solving this kind of problem is still a challenging task. The subgradient method is one of the simplest methods developed for solving these problems. Its convergence was proved only for convex objective functions. This method does not involve any subproblems, neither for finding search directions nor for computation of step lengths, which are fixed ahead of time. Bundle methods and their various modifications are among the most efficient methods for solving nonsmooth optimization problems. These methods involve a quadratic programming subproblem to find search directions. The size of the subproblem may increase significantly with the number of variables, which makes the bundle-type methods unsuitable for large scale nonsmooth optimization problems. The implementation of bundle-type methods, which require the use of the quadratic programming solvers, is not as easy as the implementation of the subgradient methods. Therefore it is beneficial to develop algorithms for nonsmooth nonconvex optimization which are easy to implement and more efficient than the subgradient methods. In this thesis, we develop two new algorithms for solving nonsmooth nonconvex optimization problems based on the use of the hyperbolic smoothing technique and apply them to solve the pumping cost minimization problem in water distribution. Both algorithms use smoothing techniques. The first algorithm is designed for solving finite minimax problems. In order to apply the hyperbolic smoothing we reformulate the objective function in the minimax problem and study the relationship between the original minimax and reformulated problems. We also study the main properties of the hyperbolic smoothing function. Based on these results an algorithm for solving the finite minimax problem is proposed and this algorithm is implemented in GAMS. We present preliminary results of numerical experiments with well-known nonsmooth optimization test problems. We also compare the proposed algorithm with the algorithm that uses the exponential smoothing function as well as with the algorithm based on nonlinear programming reformulation of the finite minimax problem. The second nonsmooth optimization algorithm we developed was used to demonstrate how smooth optimization methods can be applied to solve general nonsmooth (nonconvex) optimization problems. In order to do so we compute subgradients from some neighborhood of the current point and define a system of linear inequalities using these subgradients. Search directions are computed by solving this system. This system is solved by reducing it to the minimization of the convex piecewise linear function over the unit ball. Then the hyperbolic smoothing function is applied to approximate this minimization problem by a sequence of smooth problems which are solved by smooth optimization methods. Such an approach allows one to apply powerful smooth optimization algorithms for solving nonsmooth optimization problems and extend smoothing techniques for solving general nonsmooth nonconvex optimization problems. The convergence of the algorithm based on this approach is studied. The proposed algorithm was implemented in Fortran 95. Preliminary results of numerical experiments are reported and the proposed algorithm is compared with an other five nonsmooth optimization algorithms. We also implement the algorithm in GAMS and compare it with GAMS solvers using results of numerical experiments.
- Description: Doctor of Philosophy
- Authors: Al Nuaimat, Alia
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Nonsmooth nonconvex optimization problems arise in many applications including economics, business and data mining. In these applications objective functions are not necessarily differentiable or convex. Many algorithms have been proposed over the past three decades to solve such problems. In spite of the significant growth in this field, the development of efficient algorithms for solving this kind of problem is still a challenging task. The subgradient method is one of the simplest methods developed for solving these problems. Its convergence was proved only for convex objective functions. This method does not involve any subproblems, neither for finding search directions nor for computation of step lengths, which are fixed ahead of time. Bundle methods and their various modifications are among the most efficient methods for solving nonsmooth optimization problems. These methods involve a quadratic programming subproblem to find search directions. The size of the subproblem may increase significantly with the number of variables, which makes the bundle-type methods unsuitable for large scale nonsmooth optimization problems. The implementation of bundle-type methods, which require the use of the quadratic programming solvers, is not as easy as the implementation of the subgradient methods. Therefore it is beneficial to develop algorithms for nonsmooth nonconvex optimization which are easy to implement and more efficient than the subgradient methods. In this thesis, we develop two new algorithms for solving nonsmooth nonconvex optimization problems based on the use of the hyperbolic smoothing technique and apply them to solve the pumping cost minimization problem in water distribution. Both algorithms use smoothing techniques. The first algorithm is designed for solving finite minimax problems. In order to apply the hyperbolic smoothing we reformulate the objective function in the minimax problem and study the relationship between the original minimax and reformulated problems. We also study the main properties of the hyperbolic smoothing function. Based on these results an algorithm for solving the finite minimax problem is proposed and this algorithm is implemented in GAMS. We present preliminary results of numerical experiments with well-known nonsmooth optimization test problems. We also compare the proposed algorithm with the algorithm that uses the exponential smoothing function as well as with the algorithm based on nonlinear programming reformulation of the finite minimax problem. The second nonsmooth optimization algorithm we developed was used to demonstrate how smooth optimization methods can be applied to solve general nonsmooth (nonconvex) optimization problems. In order to do so we compute subgradients from some neighborhood of the current point and define a system of linear inequalities using these subgradients. Search directions are computed by solving this system. This system is solved by reducing it to the minimization of the convex piecewise linear function over the unit ball. Then the hyperbolic smoothing function is applied to approximate this minimization problem by a sequence of smooth problems which are solved by smooth optimization methods. Such an approach allows one to apply powerful smooth optimization algorithms for solving nonsmooth optimization problems and extend smoothing techniques for solving general nonsmooth nonconvex optimization problems. The convergence of the algorithm based on this approach is studied. The proposed algorithm was implemented in Fortran 95. Preliminary results of numerical experiments are reported and the proposed algorithm is compared with an other five nonsmooth optimization algorithms. We also implement the algorithm in GAMS and compare it with GAMS solvers using results of numerical experiments.
- Description: Doctor of Philosophy
Kemo Sabe : Tonto as a developing construction of the Indian character type
- Authors: Moll, Nicholas
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: At the opening of each episode of The Lone Ranger radio series, audiences are invited to “return with us now to those thrilling days of yesteryear”. From 1933 through to 2013 productions of The Lone Ranger media franchise have continued to extend this invitation. The evocation of the past through The Lone Ranger franchise includes Tonto: the masked man’s Indian sidekick. Tonto has remained an element of the franchise since the inception of The Lone Ranger and the development of Tonto presents an intriguing map of changing Indian characterization across the twentieth-century. This study argues that Tonto has developed as the masked man’s foil to incorporate colonial violence and Anglo-American culpability into The Lone Ranger narratives. In doing so, this thesis notes that Tonto’s assimilation within narratives of The Lone Ranger can be read like a parable, presenting a model of appropriate social responses for the interrelation of races through the masked man and Tonto’s partnership. The structure and style of Tonto’s assimilation develops gradually in the franchise over the course of the twentieth-century. Initially Tonto’s assimilation suggested a Romanticized future for the Indian following colonization. However, later productions of The Lone Ranger juxtapose assimilation with extermination. In analysing the development of Tonto, this thesis examines six features of the character. The first three are foundation concepts consisting of the idea of the Indian, the Western genre and franchise theory and development. The second three are constant facets of characterization comprised of Tonto’s status as an Indian, the recurring theme of Manifest Destiny in The Lone Ranger texts, and the growth of Tonto parallel to activism of the 1960s and 1970s. This thesis contributes to knowledge as the first study of Tonto as an ongoing development rather than a static characterization discussed in broad terms.
- Description: Doctor of Philosophy
- Authors: Moll, Nicholas
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: At the opening of each episode of The Lone Ranger radio series, audiences are invited to “return with us now to those thrilling days of yesteryear”. From 1933 through to 2013 productions of The Lone Ranger media franchise have continued to extend this invitation. The evocation of the past through The Lone Ranger franchise includes Tonto: the masked man’s Indian sidekick. Tonto has remained an element of the franchise since the inception of The Lone Ranger and the development of Tonto presents an intriguing map of changing Indian characterization across the twentieth-century. This study argues that Tonto has developed as the masked man’s foil to incorporate colonial violence and Anglo-American culpability into The Lone Ranger narratives. In doing so, this thesis notes that Tonto’s assimilation within narratives of The Lone Ranger can be read like a parable, presenting a model of appropriate social responses for the interrelation of races through the masked man and Tonto’s partnership. The structure and style of Tonto’s assimilation develops gradually in the franchise over the course of the twentieth-century. Initially Tonto’s assimilation suggested a Romanticized future for the Indian following colonization. However, later productions of The Lone Ranger juxtapose assimilation with extermination. In analysing the development of Tonto, this thesis examines six features of the character. The first three are foundation concepts consisting of the idea of the Indian, the Western genre and franchise theory and development. The second three are constant facets of characterization comprised of Tonto’s status as an Indian, the recurring theme of Manifest Destiny in The Lone Ranger texts, and the growth of Tonto parallel to activism of the 1960s and 1970s. This thesis contributes to knowledge as the first study of Tonto as an ongoing development rather than a static characterization discussed in broad terms.
- Description: Doctor of Philosophy
Learning to Lead : The social nature of women's development in sport leadership
- Authors: Brown, Suzanne
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Despite the ubiquitous political and educational strategies aimed at redressing gender inequality in sport in Australia for the past 30 years, the number of women in sport in decision-making and leadership positions has remained low when compared to men. While a number of studies have explored women’s under-representation in sport leadership roles, there is limited understanding of how women practice sport leadership and how they develop as leaders. To address this gap in the literature, this study took a humanistic approach to account for, and consider, the nature of experience and the influence of context. This study sought to provide a more personal, nuanced, and socially situated understanding of how women practiced and learned to lead in sport. An interpretive qualitative research design framed by a social constructivist lens was used for this study to examine 23 women’s accounts of what constituted and framed their leadership practices, including how they learned leadership from their engagement in day-to-day social practices and life experiences over time. Data for this study were generated through in-depth, semi-structured interviews conducted with each of the participants over a period of two years. A multi-case study approach was used to analyse the data. It was found that the participants’ leadership practice featured distinctive feminine characteristics. However, for those participants at the elite level their approaches to leadership were characterised by interaction that seemed to be traditional masculine features of leadership with the participants’ “core” feminine approaches to leadership. The participants’ leadership practice focused on social interaction and relationship building underpinned by a strong sense of moral and ethical values. Key features included collaborative decision-making, taking a team-oriented approach, using open dialogue, valuing relationships and caring about others, and positive modelling. The model of authentic leadership offered a useful way of conceptualising how the participants’ approached their practice of leadership. An examination of the participants’ accounts of their experiences of the ways they learned their leadership highlighted that leadership development for these women was a relational and social process of learning over a lifelong journey that was influenced by individual, personal experience situated within larger socio-cultural contexts. The relational nature of the participants’ learning of leadership was fundamentally connected to, and drawn from their interactions and interplay within their day-to-day social practices and life experiences from their early childhood through to their adulthood. The findings of study revealed that a range of past and present experiences and social factors influenced and shaped the participants’ values and beliefs about their leadership practice such as the development of their awareness and self-belief in their ability, the value of relationship building, and development of strength of character associated with resilience. This study also identified the significance of the informal social nature of the development of leadership through the participants’ “lived” experiences but also recognised the importance of some formal learning in developing the human capital aspects of the participants’ leadership. Findings from this study have contributed to the relatively small body of literature concerned with the examination of leadership practice and learning leadership for women in a context of sport. This study has drawn attention to the different sets of relationships that women draw on to develop their leadership practice from a young age through to their adulthood, and has highlighted the multidimensional role of relational dynamics in the construction of leadership. This study has also illustrated the importance of experiential and situated learning that occurs during the formative years through to adulthood in terms of developing women’s social skills and social awareness. These findings have implications for the way in which women’s sport leadership practice is viewed and encourages a rethinking on how affirmative action policies address the leadership developed for women in sport in Australia.
- Description: Doctor of Philosophy
- Authors: Brown, Suzanne
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Despite the ubiquitous political and educational strategies aimed at redressing gender inequality in sport in Australia for the past 30 years, the number of women in sport in decision-making and leadership positions has remained low when compared to men. While a number of studies have explored women’s under-representation in sport leadership roles, there is limited understanding of how women practice sport leadership and how they develop as leaders. To address this gap in the literature, this study took a humanistic approach to account for, and consider, the nature of experience and the influence of context. This study sought to provide a more personal, nuanced, and socially situated understanding of how women practiced and learned to lead in sport. An interpretive qualitative research design framed by a social constructivist lens was used for this study to examine 23 women’s accounts of what constituted and framed their leadership practices, including how they learned leadership from their engagement in day-to-day social practices and life experiences over time. Data for this study were generated through in-depth, semi-structured interviews conducted with each of the participants over a period of two years. A multi-case study approach was used to analyse the data. It was found that the participants’ leadership practice featured distinctive feminine characteristics. However, for those participants at the elite level their approaches to leadership were characterised by interaction that seemed to be traditional masculine features of leadership with the participants’ “core” feminine approaches to leadership. The participants’ leadership practice focused on social interaction and relationship building underpinned by a strong sense of moral and ethical values. Key features included collaborative decision-making, taking a team-oriented approach, using open dialogue, valuing relationships and caring about others, and positive modelling. The model of authentic leadership offered a useful way of conceptualising how the participants’ approached their practice of leadership. An examination of the participants’ accounts of their experiences of the ways they learned their leadership highlighted that leadership development for these women was a relational and social process of learning over a lifelong journey that was influenced by individual, personal experience situated within larger socio-cultural contexts. The relational nature of the participants’ learning of leadership was fundamentally connected to, and drawn from their interactions and interplay within their day-to-day social practices and life experiences from their early childhood through to their adulthood. The findings of study revealed that a range of past and present experiences and social factors influenced and shaped the participants’ values and beliefs about their leadership practice such as the development of their awareness and self-belief in their ability, the value of relationship building, and development of strength of character associated with resilience. This study also identified the significance of the informal social nature of the development of leadership through the participants’ “lived” experiences but also recognised the importance of some formal learning in developing the human capital aspects of the participants’ leadership. Findings from this study have contributed to the relatively small body of literature concerned with the examination of leadership practice and learning leadership for women in a context of sport. This study has drawn attention to the different sets of relationships that women draw on to develop their leadership practice from a young age through to their adulthood, and has highlighted the multidimensional role of relational dynamics in the construction of leadership. This study has also illustrated the importance of experiential and situated learning that occurs during the formative years through to adulthood in terms of developing women’s social skills and social awareness. These findings have implications for the way in which women’s sport leadership practice is viewed and encourages a rethinking on how affirmative action policies address the leadership developed for women in sport in Australia.
- Description: Doctor of Philosophy
Nonsmooth and derivative-free optimization based hybrid methods and applications
- Authors: Long, Qiang
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: "In this thesis, we develop hybrid methods for solving global and in particular, nonsmooth optimization problems. Hybrid methods are becoming more popular in global optimization since they allow to apply powerful smooth optimization techniques to solve global optimization problems. Such methods are able to efficiently solve global optimization problems with large number of variables. To date global search algorithms have been mainly applied to improve global search properties of the local search methods (including smooth optimization algorithms). In this thesis we apply rather different strategy to design hybrid methods. We use local search algorithms to improve the efficiency of global search methods. The thesis consists of two parts. In the first part we describe hybrid algorithms and in the second part we consider their various applications." -- taken from Abstract.
- Description: Operational Research and Cybernetics
- Authors: Long, Qiang
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: "In this thesis, we develop hybrid methods for solving global and in particular, nonsmooth optimization problems. Hybrid methods are becoming more popular in global optimization since they allow to apply powerful smooth optimization techniques to solve global optimization problems. Such methods are able to efficiently solve global optimization problems with large number of variables. To date global search algorithms have been mainly applied to improve global search properties of the local search methods (including smooth optimization algorithms). In this thesis we apply rather different strategy to design hybrid methods. We use local search algorithms to improve the efficiency of global search methods. The thesis consists of two parts. In the first part we describe hybrid algorithms and in the second part we consider their various applications." -- taken from Abstract.
- Description: Operational Research and Cybernetics
Partnership rhetoric and risk realities : the implications of risk in government/non-government family services partnerships
- Authors: McDonald, Kelsey
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: "This empirical study examined risk transfer from the government to the non-government sector within a public/non-profit child and family services delivery partnership. The focus of the investigation was to determine if risk had been transferred from the government to the non-government partner, and how this had impacted on welfare practice, service provision and outcomes for service users. A case study of a 2007 government/non-government child protection and child and family services partnership in the state of Victoria, Australia provided the context for the study. The research framework involved a predominantly qualitative methodology, with the researcher embedded at two Victorian Community Service Organisations (CSOs) for a 12-month period." -- Taken from Abstract.
- Description: Doctorate of Philosopy
- Authors: McDonald, Kelsey
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: "This empirical study examined risk transfer from the government to the non-government sector within a public/non-profit child and family services delivery partnership. The focus of the investigation was to determine if risk had been transferred from the government to the non-government partner, and how this had impacted on welfare practice, service provision and outcomes for service users. A case study of a 2007 government/non-government child protection and child and family services partnership in the state of Victoria, Australia provided the context for the study. The research framework involved a predominantly qualitative methodology, with the researcher embedded at two Victorian Community Service Organisations (CSOs) for a 12-month period." -- Taken from Abstract.
- Description: Doctorate of Philosopy
The physiology of road cycling : New testing and training methodologies for competitive cyclists
- Authors: Clark, Bradley
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Objective: The objective of this project is to describe and test the efficacy of new testing and training techniques for competitive cyclists. Methods: Physiological variables and cycling performance were measured during a graded exercise test (GXT) and a novel, computer-simulated, variable gradient 20-km cycling time-trial. Initially, data collected from the time-trial and GXT were used to establish the reliability of the time-trial, determine the laboratory correlates of hilly cycling performance and examine the pacing pattern during hilly cycling performance. Then, results from a series of GXT’s and time-trials were used to establish the effects of a brief period of overload training on the physiology and performance of competitive cyclists. Results: Power output and performance time measured during a computer simulated 20-km variable gradient cycling test were reliable, however reliability diminished with increasing time between trials. Performance in variable gradient time-trial correlated strongly with absolute measures of physiological variables; however the strength of correlations increased when variables were measured relative to body mass. Power output was highest during the first four and last two kilometres of a variable gradient time-trial. Additionally, there were large differences in power output between consecutive one kilometre segments throughout the trial, particularly when the difference in gradient between segments was greater. Performance in the variable gradient time-trial improved substantially following a brief period of overload training. Performance improvement corresponded with adaptation in important physiological determinants of cycling performance, namely maximal oxygen uptake, lactate threshold and gross efficiency. Conclusions: Variable gradient, cycling time-trial tests can be used to detect meaningful changes in performance, evoke dynamic distribution of power output and are best suited to cyclists who produce high power outputs relative to body mass. The current project also determined that a brief period of overload training induces physiological adaptation and substantial improvement in cycling performance in competitive cyclists. Sport scientists, coaches and cyclists can use this information to determine the testing and training techniques used in preparation for competition.
- Description: Doctor of Philosophy
- Authors: Clark, Bradley
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Objective: The objective of this project is to describe and test the efficacy of new testing and training techniques for competitive cyclists. Methods: Physiological variables and cycling performance were measured during a graded exercise test (GXT) and a novel, computer-simulated, variable gradient 20-km cycling time-trial. Initially, data collected from the time-trial and GXT were used to establish the reliability of the time-trial, determine the laboratory correlates of hilly cycling performance and examine the pacing pattern during hilly cycling performance. Then, results from a series of GXT’s and time-trials were used to establish the effects of a brief period of overload training on the physiology and performance of competitive cyclists. Results: Power output and performance time measured during a computer simulated 20-km variable gradient cycling test were reliable, however reliability diminished with increasing time between trials. Performance in variable gradient time-trial correlated strongly with absolute measures of physiological variables; however the strength of correlations increased when variables were measured relative to body mass. Power output was highest during the first four and last two kilometres of a variable gradient time-trial. Additionally, there were large differences in power output between consecutive one kilometre segments throughout the trial, particularly when the difference in gradient between segments was greater. Performance in the variable gradient time-trial improved substantially following a brief period of overload training. Performance improvement corresponded with adaptation in important physiological determinants of cycling performance, namely maximal oxygen uptake, lactate threshold and gross efficiency. Conclusions: Variable gradient, cycling time-trial tests can be used to detect meaningful changes in performance, evoke dynamic distribution of power output and are best suited to cyclists who produce high power outputs relative to body mass. The current project also determined that a brief period of overload training induces physiological adaptation and substantial improvement in cycling performance in competitive cyclists. Sport scientists, coaches and cyclists can use this information to determine the testing and training techniques used in preparation for competition.
- Description: Doctor of Philosophy
Why firms in China go green and how they market green?
- Authors: Song-Turner, Helen
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Since the late 1970s China has strived to build a globally competitive market economy based on a range of industry sectors, focusing on manufacturing and allied industries. By 2014 the size of China’s economy is second only to that of the United States of America. A challenge in this context and situation—where economic growth is still a key area of policy focus for the government—is dealing with associated environmental matters and issues. By the turn of the 21st Century, environmental issues were receiving an unprecedented degree of attention from the Chinese Government, and one of the subsets of this issue is the concept of green marketing. A question arises regarding the possibilities of successful growing firms in China applying the concepts, principles and practices which embody green marketing within a rubric and context of sustained economic development. To gain a deep understanding of ways in which the concepts, applications and conditions of green marketing actually work in China, this research explores why firms in China go green and how they market their green products and services in China using an emic approach that emphasizes an indigenous, within culture perspective of firms’ behaviour in the Chinese context. Related to the research question this research explores a range of possible motivating factors and ascertains features of key influential stakeholders which might well influence firms’ green marketing approaches and practices in China. These firms are exceptional in the way they have addressed green marketing. The research undertaken seeks to identify ways in which these factors translate in marketing terms within a green marketing paradigm. Given that green marketing is arguably where economic development and environmental matters tend to interact and intersect within a market economy, this research provides insights to how sustainable Chinese firms deal with this complex and important issue. The use of a case study approach, across a range of industry sectors and in a variety of locations in China, provides depth and realism to this research. The result of this research contribute significantly to the understanding of how Chinese managers perceive ecological sustainability and expand firm stakeholder theory by identifying key influential stakeholders in proactive green decisions. The ways in which firms define and identify key influential stakeholders in their green decisions are influenced by resource dependency, the institutional power of the stakeholders, and moderated by firm’s characteristics and life cycle stages. Firms operating in a strong government-driven setting derive four conceptual green motivations—philosophical and social responsibility, management of risk reduction, competition pressure, and special events— that offer insights on understanding firms’ green behaviours and green orientations in China.
- Authors: Song-Turner, Helen
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Since the late 1970s China has strived to build a globally competitive market economy based on a range of industry sectors, focusing on manufacturing and allied industries. By 2014 the size of China’s economy is second only to that of the United States of America. A challenge in this context and situation—where economic growth is still a key area of policy focus for the government—is dealing with associated environmental matters and issues. By the turn of the 21st Century, environmental issues were receiving an unprecedented degree of attention from the Chinese Government, and one of the subsets of this issue is the concept of green marketing. A question arises regarding the possibilities of successful growing firms in China applying the concepts, principles and practices which embody green marketing within a rubric and context of sustained economic development. To gain a deep understanding of ways in which the concepts, applications and conditions of green marketing actually work in China, this research explores why firms in China go green and how they market their green products and services in China using an emic approach that emphasizes an indigenous, within culture perspective of firms’ behaviour in the Chinese context. Related to the research question this research explores a range of possible motivating factors and ascertains features of key influential stakeholders which might well influence firms’ green marketing approaches and practices in China. These firms are exceptional in the way they have addressed green marketing. The research undertaken seeks to identify ways in which these factors translate in marketing terms within a green marketing paradigm. Given that green marketing is arguably where economic development and environmental matters tend to interact and intersect within a market economy, this research provides insights to how sustainable Chinese firms deal with this complex and important issue. The use of a case study approach, across a range of industry sectors and in a variety of locations in China, provides depth and realism to this research. The result of this research contribute significantly to the understanding of how Chinese managers perceive ecological sustainability and expand firm stakeholder theory by identifying key influential stakeholders in proactive green decisions. The ways in which firms define and identify key influential stakeholders in their green decisions are influenced by resource dependency, the institutional power of the stakeholders, and moderated by firm’s characteristics and life cycle stages. Firms operating in a strong government-driven setting derive four conceptual green motivations—philosophical and social responsibility, management of risk reduction, competition pressure, and special events— that offer insights on understanding firms’ green behaviours and green orientations in China.
A collaborative exploration of creativity, doodling and flow : A practice-based education inquiry
- Authors: Barrand, Katherine
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The initial stage of this inquiry is a solo exploration of my definition of doodling, how doodling became my preferred artistic process, and reflectively examines the factors that contribute to my experience of flow moments when creating art. An intrinsic component of this solo research was finding new ways to create moments of flow when working individually, and reflecting how they could influence and shape the second stage of the project. The second stage of this inquiry investigates doodling in collaboration with four participating artists. In an attempt to flesh out the spaces between conscious and unconscious artistic interventions, and the role that outside influences can play on the creative process, this collaborative inquiry developed into an examination of the factors which influence co-creation during different stages of art making. The framework for this second inquiry was created by utilising insights gained from the initial solo investigation Accordingly, this research includes multiple strands of artistic exploration, including solo works, works created in collaboration, and interviews with the collaborating artists involved in the project. Selected key solo works and all artistic collaborations are included in the body of this exegesis to encourage immersion in this practice based research. Beginning as an artist and incorporating the different roles of researcher and teacher into the work, this research is an a/r/tographical inquiry into the way these oftentimes overlapping identities influence and guided the research. The outcomes from this research include insights into my creative processes, revealing previously unacknowledged tensions between the need for creative control and flow. One of the most important outcomes from this research was the development of non-verbal conversations between artists, and the way the collaborative process has the potential to both encourage and hinder flow moments. This work is a self-study which incorporates others in relation to my own work. I believe it holds significant relevance to a wider artistic audience seeking a different perspective on encouraging collaborative artistic flow, and the method of collaborative doodling enacted in this research has potential applications in both formal and informal educational settings.
- Description: Doctor of Philosophy
- Authors: Barrand, Katherine
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The initial stage of this inquiry is a solo exploration of my definition of doodling, how doodling became my preferred artistic process, and reflectively examines the factors that contribute to my experience of flow moments when creating art. An intrinsic component of this solo research was finding new ways to create moments of flow when working individually, and reflecting how they could influence and shape the second stage of the project. The second stage of this inquiry investigates doodling in collaboration with four participating artists. In an attempt to flesh out the spaces between conscious and unconscious artistic interventions, and the role that outside influences can play on the creative process, this collaborative inquiry developed into an examination of the factors which influence co-creation during different stages of art making. The framework for this second inquiry was created by utilising insights gained from the initial solo investigation Accordingly, this research includes multiple strands of artistic exploration, including solo works, works created in collaboration, and interviews with the collaborating artists involved in the project. Selected key solo works and all artistic collaborations are included in the body of this exegesis to encourage immersion in this practice based research. Beginning as an artist and incorporating the different roles of researcher and teacher into the work, this research is an a/r/tographical inquiry into the way these oftentimes overlapping identities influence and guided the research. The outcomes from this research include insights into my creative processes, revealing previously unacknowledged tensions between the need for creative control and flow. One of the most important outcomes from this research was the development of non-verbal conversations between artists, and the way the collaborative process has the potential to both encourage and hinder flow moments. This work is a self-study which incorporates others in relation to my own work. I believe it holds significant relevance to a wider artistic audience seeking a different perspective on encouraging collaborative artistic flow, and the method of collaborative doodling enacted in this research has potential applications in both formal and informal educational settings.
- Description: Doctor of Philosophy
About regularity properties in variational analysis and applications in optimization
- Authors: Nguyen, Hieu Thao
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Regularity properties lie at the core of variational analysis because of their importance for stability analysis of optimization and variational problems, constraint qualications, qualication conditions in coderivative and subdierential calculus and convergence analysis of numerical algorithms. The thesis is devoted to investigation of several research questions related to regularity properties in variational analysis and their applications in convergence analysis and optimization. Following the works by Kruger, we examine several useful regularity properties of collections of sets in both linear and Holder-type settings and establish their characterizations and relationships to regularity properties of set-valued mappings. Following the recent publications by Lewis, Luke, Malick (2009), Drusvyatskiy, Ioe, Lewis (2014) and some others, we study application of the uniform regularity and related properties of collections of sets to alternating projections for solving nonconvex feasibility problems and compare existing results on this topic. Motivated by Ioe (2000) and his subsequent publications, we use the classical iteration scheme going back to Banach, Schauder, Lyusternik and Graves to establish criteria for regularity properties of set-valued mappings and compare this approach with the one based on the Ekeland variational principle. Finally, following the recent works by Khanh et al. on stability analysis for optimization related problems, we investigate calmness of set-valued solution mappings of variational problems.
- Description: Doctor of Philosophy
- Description: Regularity properties lie at the core of variational analysis because of their importance for stability analysis of optimization and variational problems, constraint qualications, qualication conditions in coderivative and subdierential calculus and convergence analysis of numerical algorithms. The thesis is devoted to investigation of several research questions related to regularity properties in variational analysis and their applications in convergence analysis and optimization. Following the works by Kruger, we examine several useful regularity properties of collections of sets in both linear and H
- Authors: Nguyen, Hieu Thao
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Regularity properties lie at the core of variational analysis because of their importance for stability analysis of optimization and variational problems, constraint qualications, qualication conditions in coderivative and subdierential calculus and convergence analysis of numerical algorithms. The thesis is devoted to investigation of several research questions related to regularity properties in variational analysis and their applications in convergence analysis and optimization. Following the works by Kruger, we examine several useful regularity properties of collections of sets in both linear and Holder-type settings and establish their characterizations and relationships to regularity properties of set-valued mappings. Following the recent publications by Lewis, Luke, Malick (2009), Drusvyatskiy, Ioe, Lewis (2014) and some others, we study application of the uniform regularity and related properties of collections of sets to alternating projections for solving nonconvex feasibility problems and compare existing results on this topic. Motivated by Ioe (2000) and his subsequent publications, we use the classical iteration scheme going back to Banach, Schauder, Lyusternik and Graves to establish criteria for regularity properties of set-valued mappings and compare this approach with the one based on the Ekeland variational principle. Finally, following the recent works by Khanh et al. on stability analysis for optimization related problems, we investigate calmness of set-valued solution mappings of variational problems.
- Description: Doctor of Philosophy
- Description: Regularity properties lie at the core of variational analysis because of their importance for stability analysis of optimization and variational problems, constraint qualications, qualication conditions in coderivative and subdierential calculus and convergence analysis of numerical algorithms. The thesis is devoted to investigation of several research questions related to regularity properties in variational analysis and their applications in convergence analysis and optimization. Following the works by Kruger, we examine several useful regularity properties of collections of sets in both linear and H
An Australian Rules for radicals? Community activism and genuine empowerment
- Authors: Harrison, Tim
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis seeks to develop a critical understanding of the impact of a particular Community Renewal project on the residents. The Wendouree West Community Renewal was part of a broader Victorian state government intervention, Neighbourhood Renewal, which worked ‘on’ communities identified as disadvantaged. The study investigated the experiences of key residents, along with those of the author, during the period 2001-2013. The main contention is that Wendouree West Community Renewal project colluded with the welfare sector to impose a hegemonic and alien set of understandings on the community. This study is passionate; it takes a stance that is unashamedly political, ideological and partisan. Its key premise is that government interventions of this kind are damaging to communities like the one investigated. The Wendouree West experience promoted a three-fold residualisation: at the level of a ‘breaking down’ of local economies; an undermining of formal and informal education at a community level; and a manipulation of understandings of place, belonging and community that resulted in the imposition of a fake ’aspirational community’ in Wendouree West. The impact of this three-fold residualisation was a deep stigmatisation of Wendouree West as a ‘non-place’ (Auge, 2008), enabling its ultimate ghettoisation, both within the broader context of the regional city of which Wendouree West forms a small part, and within the understandings of residents themselves. This thesis represents struggle at a number of levels: the struggle of the residents to push back against a hegemonic intervention; the struggle of a scholar to make sense of his own role within the action; and the struggle of how to represent the residents’ stories in ways that are powerful and ‘truthful’ within the context of a PhD thesis. ii The ‘critical hope’ of this work is that the residents are able to push back against this program through acts of resistance and that community organising, in the style of the American radical Saul Alinsky, may represent a possible longer term means for empowerment and self-determination.
- Description: Doctor of Philosophy
- Authors: Harrison, Tim
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis seeks to develop a critical understanding of the impact of a particular Community Renewal project on the residents. The Wendouree West Community Renewal was part of a broader Victorian state government intervention, Neighbourhood Renewal, which worked ‘on’ communities identified as disadvantaged. The study investigated the experiences of key residents, along with those of the author, during the period 2001-2013. The main contention is that Wendouree West Community Renewal project colluded with the welfare sector to impose a hegemonic and alien set of understandings on the community. This study is passionate; it takes a stance that is unashamedly political, ideological and partisan. Its key premise is that government interventions of this kind are damaging to communities like the one investigated. The Wendouree West experience promoted a three-fold residualisation: at the level of a ‘breaking down’ of local economies; an undermining of formal and informal education at a community level; and a manipulation of understandings of place, belonging and community that resulted in the imposition of a fake ’aspirational community’ in Wendouree West. The impact of this three-fold residualisation was a deep stigmatisation of Wendouree West as a ‘non-place’ (Auge, 2008), enabling its ultimate ghettoisation, both within the broader context of the regional city of which Wendouree West forms a small part, and within the understandings of residents themselves. This thesis represents struggle at a number of levels: the struggle of the residents to push back against a hegemonic intervention; the struggle of a scholar to make sense of his own role within the action; and the struggle of how to represent the residents’ stories in ways that are powerful and ‘truthful’ within the context of a PhD thesis. ii The ‘critical hope’ of this work is that the residents are able to push back against this program through acts of resistance and that community organising, in the style of the American radical Saul Alinsky, may represent a possible longer term means for empowerment and self-determination.
- Description: Doctor of Philosophy
Becoming "Brave and Gallant" : Decolonising the myths of Burke and Wills; Cross-cultural exchanges and the co-production of knowledge during the Victorian Exploring Expedition and the subsequent Relief Expeditions
- Authors: Jeffries, Peta
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The history of the Victorian Exploring Expedition (VEE), also known as ‘Burke and Wills’, has commonly been told as a story of ‘brave and gallant men’ who ventured into an unfamiliar landscape and became victims of the ‘ghastly blank’ interior of Australia. Visual artists and historians have memorialised these men as solo-hero explorers who sacrificed their youth and life potential for the sake of Australian nation. The myth of Burke and Wills is a constructed narrative and symbol of glory and achievement that denies the involvement of significant others in exploration and geographical knowledge creation. The path the VEE created through the centre of Australia opened up the broader continent for rapid colonisation and imperial expansion. The tragic legacy of the deaths of Burke and Wills is part of the Australian identity, however, some major aspects of the VEE successes and failures have been sidelined, silenced and even completely ignored in many historical accounts. The historical and visual art accounts that contributed to the memorialisation of Burke and Wills often denied the involvement of other exploration team members, the relief expeditions who went in search of the missing explorers, various intermediaries, guides, go-betweens and significantly Aboriginal peoples’ close involvement and or resistance to interior exploration. Yandruwandha people have been remembered as a friendly and accommodating community who assisted the explorers in their last days and who cared for John King. Within the archives and social memories are examples of agency, power, resistance, and varied perspectives of Burke and Wills. This ethnographic history asks why relations between the explorers, Aboriginal peoples and landscape have been told the way they have and provides examples of encounter and exchange, mutual adaptation and the co-production of knowledge as a way to decolonise the myths of Burke and Wills.
- Description: Doctor of Philosophy
- Authors: Jeffries, Peta
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The history of the Victorian Exploring Expedition (VEE), also known as ‘Burke and Wills’, has commonly been told as a story of ‘brave and gallant men’ who ventured into an unfamiliar landscape and became victims of the ‘ghastly blank’ interior of Australia. Visual artists and historians have memorialised these men as solo-hero explorers who sacrificed their youth and life potential for the sake of Australian nation. The myth of Burke and Wills is a constructed narrative and symbol of glory and achievement that denies the involvement of significant others in exploration and geographical knowledge creation. The path the VEE created through the centre of Australia opened up the broader continent for rapid colonisation and imperial expansion. The tragic legacy of the deaths of Burke and Wills is part of the Australian identity, however, some major aspects of the VEE successes and failures have been sidelined, silenced and even completely ignored in many historical accounts. The historical and visual art accounts that contributed to the memorialisation of Burke and Wills often denied the involvement of other exploration team members, the relief expeditions who went in search of the missing explorers, various intermediaries, guides, go-betweens and significantly Aboriginal peoples’ close involvement and or resistance to interior exploration. Yandruwandha people have been remembered as a friendly and accommodating community who assisted the explorers in their last days and who cared for John King. Within the archives and social memories are examples of agency, power, resistance, and varied perspectives of Burke and Wills. This ethnographic history asks why relations between the explorers, Aboriginal peoples and landscape have been told the way they have and provides examples of encounter and exchange, mutual adaptation and the co-production of knowledge as a way to decolonise the myths of Burke and Wills.
- Description: Doctor of Philosophy
Canonical Duality Theory for Global Optimization problems and applications
- Chen, Yi
- Authors: Chen, Yi
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The canonical duality theory is studied, through a discussion on a general global optimization problem and applications on fundamentally important problems. This general problem is a formulation of the minimization problem with inequality constraints, where the objective function and constraints are any convex or nonconvex functions satisfying certain decomposition conditions. It covers convex problems, mixed integer programming problems and many other nonlinear programming problems. The three main parts of the canonical duality theory are canonical dual transformation, complementary-dual principle and triality theory. The complementary-dual principle is further developed, which conventionally states that each critical point of the canonical dual problem is corresponding to a KKT point of the primal problem with their sharing the same function value. The new result emphasizes that there exists a one-to-one correspondence between KKT points of the dual problem and of the primal problem and each pair of the corresponding KKT points share the same function value, which implies that there is truly no duality gap between the canonical dual problem and the primal problem. The triality theory reveals insightful information about global and local solutions. It is shown that as long as the global optimality condition holds true, the primal problem is equivalent to a convex problem in the dual space, which can be solved efficiently by existing convex methods; even if the condition does not hold, the convex problem still provides a lower bound that is at least as good as that by the Lagrangian relaxation method. It is also shown that through examining the canonical dual problem, the hidden convexity of the primal problem is easily observable. The canonical duality theory is then applied to dealing with three fundamentally important problems. The first one is the spherically constrained quadratic problem, also referred to as the trust region subproblem. The canonical dual problem is onedimensional and it is proved that the primal problem, no matter with convex or nonconvex objective function, is equivalent to a convex problem in the dual space. Moreover, conditions are found which comprise the boundary that separates instances into “hard case” and “easy case”. A canonical primal-dual algorithm is developed, which is able to efficiently solve the problem, including the “hard case”, and can be used as a unified method for similar problems. The second one is the binary quadratic problem, a fundamental problem in discrete optimization. The discussion is focused on lower bounds and analytically solvable cases, which are obtained by analyzing the canonical dual problem with perturbation techniques. The third one is a general nonconvex problem with log-sum-exp functions and quartic polynomials. It arises widely in engineering science and it can be used to approximate nonsmooth optimization problems. The work shows that problems can still be efficiently solved, via the canonical duality approach, even if they are nonconvex and nonsmooth.
- Description: Doctor of Philosophy
- Authors: Chen, Yi
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The canonical duality theory is studied, through a discussion on a general global optimization problem and applications on fundamentally important problems. This general problem is a formulation of the minimization problem with inequality constraints, where the objective function and constraints are any convex or nonconvex functions satisfying certain decomposition conditions. It covers convex problems, mixed integer programming problems and many other nonlinear programming problems. The three main parts of the canonical duality theory are canonical dual transformation, complementary-dual principle and triality theory. The complementary-dual principle is further developed, which conventionally states that each critical point of the canonical dual problem is corresponding to a KKT point of the primal problem with their sharing the same function value. The new result emphasizes that there exists a one-to-one correspondence between KKT points of the dual problem and of the primal problem and each pair of the corresponding KKT points share the same function value, which implies that there is truly no duality gap between the canonical dual problem and the primal problem. The triality theory reveals insightful information about global and local solutions. It is shown that as long as the global optimality condition holds true, the primal problem is equivalent to a convex problem in the dual space, which can be solved efficiently by existing convex methods; even if the condition does not hold, the convex problem still provides a lower bound that is at least as good as that by the Lagrangian relaxation method. It is also shown that through examining the canonical dual problem, the hidden convexity of the primal problem is easily observable. The canonical duality theory is then applied to dealing with three fundamentally important problems. The first one is the spherically constrained quadratic problem, also referred to as the trust region subproblem. The canonical dual problem is onedimensional and it is proved that the primal problem, no matter with convex or nonconvex objective function, is equivalent to a convex problem in the dual space. Moreover, conditions are found which comprise the boundary that separates instances into “hard case” and “easy case”. A canonical primal-dual algorithm is developed, which is able to efficiently solve the problem, including the “hard case”, and can be used as a unified method for similar problems. The second one is the binary quadratic problem, a fundamental problem in discrete optimization. The discussion is focused on lower bounds and analytically solvable cases, which are obtained by analyzing the canonical dual problem with perturbation techniques. The third one is a general nonconvex problem with log-sum-exp functions and quartic polynomials. It arises widely in engineering science and it can be used to approximate nonsmooth optimization problems. The work shows that problems can still be efficiently solved, via the canonical duality approach, even if they are nonconvex and nonsmooth.
- Description: Doctor of Philosophy
Causes, magnitude and implications of Griefing in Massively Multiplayer Online Role-Playing Games
- Authors: Achterbosch, Leigh
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis presents findings from research into the global phenomenon known as griefing that occurs in Massively Multiplayer Online Role-Playing Games (MMORPGs). Griefing, in its simplest terms, refers to the act of one player intentionally disrupting another player’s game experience for personal pleasure and potential gain. For too long it has been unknown how pervasive griefing is, how frequently griefing occurs and, in particular, the impact on players that are subjected to griefing. There has also been limited research regarding what causes a player to perform griefing. This thesis addresses these concerns by answering the research question “What are the causes and implications of griefing in Massively Multiplayer Online Role-Playing Games, and what magnitude of griefing exists in this genre?” Mixed method research was employed using the “Sequential Explanatory Strategy”, in which a quantitative phase was followed by a qualitative phase to strengthen the findings. The quantitative phase consisted of a survey that attracted 1188 participants of a representative player population. The qualitative phase consisted of interviews with 15 participants to give more personalised data. The data was analysed from the perspectives of different demographics and different associations to griefing. The thesis contributed original findings regarding the causes, magnitude and implications of griefing in MMORPGs. Some of the main findings were: • Factors that motivated a player to cause grief; • how griefers selected their targets based on particular demographics or avatar characteristics; • the pervasiveness, frequency and impact of different types of griefing; • the amount of griefing that can be tolerated; • how players reacted to griefing; • the impact to the well-being of the players after a griefing incident. The thesis concluded with advice to MMORPG developers regarding the most pervasive, frequent and impactful types of griefing, and how game design may increase or decrease the amount and intensity of griefing.
- Description: Doctor of Philosophy
- Authors: Achterbosch, Leigh
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: This thesis presents findings from research into the global phenomenon known as griefing that occurs in Massively Multiplayer Online Role-Playing Games (MMORPGs). Griefing, in its simplest terms, refers to the act of one player intentionally disrupting another player’s game experience for personal pleasure and potential gain. For too long it has been unknown how pervasive griefing is, how frequently griefing occurs and, in particular, the impact on players that are subjected to griefing. There has also been limited research regarding what causes a player to perform griefing. This thesis addresses these concerns by answering the research question “What are the causes and implications of griefing in Massively Multiplayer Online Role-Playing Games, and what magnitude of griefing exists in this genre?” Mixed method research was employed using the “Sequential Explanatory Strategy”, in which a quantitative phase was followed by a qualitative phase to strengthen the findings. The quantitative phase consisted of a survey that attracted 1188 participants of a representative player population. The qualitative phase consisted of interviews with 15 participants to give more personalised data. The data was analysed from the perspectives of different demographics and different associations to griefing. The thesis contributed original findings regarding the causes, magnitude and implications of griefing in MMORPGs. Some of the main findings were: • Factors that motivated a player to cause grief; • how griefers selected their targets based on particular demographics or avatar characteristics; • the pervasiveness, frequency and impact of different types of griefing; • the amount of griefing that can be tolerated; • how players reacted to griefing; • the impact to the well-being of the players after a griefing incident. The thesis concluded with advice to MMORPG developers regarding the most pervasive, frequent and impactful types of griefing, and how game design may increase or decrease the amount and intensity of griefing.
- Description: Doctor of Philosophy
Classification of network information flow analysis (CONIFA) to detect new application versions
- Authors: Azab, Ahmad
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Monitoring network traffic to identify applications or services is vital for internet service providers, network engineers and law enforcement agencies. The identification of applications enables network traffic to be prioritized, sophisticated plans for network infrastructure to be developed and facilitates the work of law enforcement agencies. Voice over IP (VoIP) and malware services are important to be classified because of the reliance by both legitimate users and cybercriminals respectively on these services. This dissertation addresses the detection of these services, represented by Skype application voice calls traffic and Zeus application command and control traffic. Three major approaches have been used to fulfil the classification goal, which are port-based, deep packet inspection and the use of the statistical features in conjunction with the machine learning algorithms. The latter approach addressed many of the limitations of the first two. However, the existing approach still contains many limitations. The detection of new versions by analysing and building the classifier on an old version was not deeply discussed for the machine learning approach. However, not all the statistical values are similar for different versions for Skype voice calls and Zeus command and control traffic. This is because Skype uses different codecs for different versions and Zeus uses different malware builders for different versions. While some approaches, aside from the machine learning approach, tackled the detection of the different versions, none of them maintain all the characteristics supported by the machine learning approach in terms of providing online classification capability and supporting various transport and application protocols, without the need to access different device’s traffic, access packet’s content or monitor different phase’s traffic. This research study aims to tackle this gap by proposing a novel framework called Classification of Network Information Flow Analysis (CONIFA). CONIFA addresses the detection of different untrained versions for a targeted application (Skype voice calls and Zeus command and control traffic) with a low detection time by analysing and building the classifier on a different single version in a systematic and well-defined approach, providing online classification capability and supporting various transport and application protocols, without the need to access different device’s traffic, access packet’s content or monitor different phase’s traffic. CONIFA is not limited to a specific application and could be extended to other types of applications. CONIFA utilizes the concepts of cost sensitive algorithms and different feature combinations for building the classifiers, unlike the machine learning approach that utilizes cost insensitive algorithms and a single feature combination. The outputs of the first phase are two classifiers, lenient and strict, that are used by the next phase to detect the untrained versions of a targeted application as well as to reduce the error rate. CONIFA results, for detecting the untrained version of Skype voice calls and Zeus C&C traffic, supported this approach in providing a better detection performance compared to the previous approach. While the previous approach was not able to reliably detect new versions of VoIP, CONIFA was able to consistently detect a previously unseen version. For the botnet detection, the previous approach had a good efficacy at the network level. However, CONIFA outperformed this approach in detecting a new version of a known piece of malware.
- Description: Doctor of Philosophy
- Authors: Azab, Ahmad
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Monitoring network traffic to identify applications or services is vital for internet service providers, network engineers and law enforcement agencies. The identification of applications enables network traffic to be prioritized, sophisticated plans for network infrastructure to be developed and facilitates the work of law enforcement agencies. Voice over IP (VoIP) and malware services are important to be classified because of the reliance by both legitimate users and cybercriminals respectively on these services. This dissertation addresses the detection of these services, represented by Skype application voice calls traffic and Zeus application command and control traffic. Three major approaches have been used to fulfil the classification goal, which are port-based, deep packet inspection and the use of the statistical features in conjunction with the machine learning algorithms. The latter approach addressed many of the limitations of the first two. However, the existing approach still contains many limitations. The detection of new versions by analysing and building the classifier on an old version was not deeply discussed for the machine learning approach. However, not all the statistical values are similar for different versions for Skype voice calls and Zeus command and control traffic. This is because Skype uses different codecs for different versions and Zeus uses different malware builders for different versions. While some approaches, aside from the machine learning approach, tackled the detection of the different versions, none of them maintain all the characteristics supported by the machine learning approach in terms of providing online classification capability and supporting various transport and application protocols, without the need to access different device’s traffic, access packet’s content or monitor different phase’s traffic. This research study aims to tackle this gap by proposing a novel framework called Classification of Network Information Flow Analysis (CONIFA). CONIFA addresses the detection of different untrained versions for a targeted application (Skype voice calls and Zeus command and control traffic) with a low detection time by analysing and building the classifier on a different single version in a systematic and well-defined approach, providing online classification capability and supporting various transport and application protocols, without the need to access different device’s traffic, access packet’s content or monitor different phase’s traffic. CONIFA is not limited to a specific application and could be extended to other types of applications. CONIFA utilizes the concepts of cost sensitive algorithms and different feature combinations for building the classifiers, unlike the machine learning approach that utilizes cost insensitive algorithms and a single feature combination. The outputs of the first phase are two classifiers, lenient and strict, that are used by the next phase to detect the untrained versions of a targeted application as well as to reduce the error rate. CONIFA results, for detecting the untrained version of Skype voice calls and Zeus C&C traffic, supported this approach in providing a better detection performance compared to the previous approach. While the previous approach was not able to reliably detect new versions of VoIP, CONIFA was able to consistently detect a previously unseen version. For the botnet detection, the previous approach had a good efficacy at the network level. However, CONIFA outperformed this approach in detecting a new version of a known piece of malware.
- Description: Doctor of Philosophy
Cultural influence on China's household saving
- Authors: Boffa, Zhang-Ming
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The recession following the 2008 Global Financial Crisis highlighted the problem of deficient household saving and imprudent consumer credit. Studies of selected economies reveal that household saving tends to decline as economies move to higher stages of development. Following rapid economic growth, China’s household saving, possibly due to the influence of traditional culture, has remained high by international standards while consumer credit levels are low. This significant phenomenon has prompted the question of what this development trajectory may become as China proceeds to higher income levels. Whereas the economic, social and financial development factors related to household saving and development have been well researched, from the perspective of this investigation, there are missing ‘cultural values’ in the analysis. Consequently, the Institutional Economics concept of ‘culture as a value’ provides the basis for this thesis into the influence of culture on China’s household saving and its effects. By extending Keynes’s General Theory in relation to saving, and incorporating studies from both the Chinese and Western scholarly traditions, five themes are identified as influencing the cultural preferences of China’s household saving. These are: (i) precautionary motives; (ii) habit formation; (iii) children’s education; (iv) consumer credit; and (v) teaching thrift. The holistic approach of this study has allowed a deeper understanding of the role of cultural values on agency and structure in economic events and their subsequent impact on household saving. Results of this investigation indicate that the Confucian value of family ties and ‘Zhong Yong’ – the Golden Mean, which translates essentially as balance, enable Chinese households to save. This development has highlighted a growing tension, in China’s modernity process, between the traditional Confucian value of thrift and the Western cultural influence of stimulating economic growth by consumption. After consideration of current saving practices and the anticipation of economic changes, this research advocates the striking of a balance between household saving and increasing consumption in China in order to avert a future financial crisis and to facilitate economic growth. The implication of this research is that finding a balance between household saving and consumption is crucial to sustainable future development in China as it shifts its development focus from investment and export-led to domestic consumption-driven growth and social development.
- Description: Doctor of Philosophy
- Authors: Boffa, Zhang-Ming
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The recession following the 2008 Global Financial Crisis highlighted the problem of deficient household saving and imprudent consumer credit. Studies of selected economies reveal that household saving tends to decline as economies move to higher stages of development. Following rapid economic growth, China’s household saving, possibly due to the influence of traditional culture, has remained high by international standards while consumer credit levels are low. This significant phenomenon has prompted the question of what this development trajectory may become as China proceeds to higher income levels. Whereas the economic, social and financial development factors related to household saving and development have been well researched, from the perspective of this investigation, there are missing ‘cultural values’ in the analysis. Consequently, the Institutional Economics concept of ‘culture as a value’ provides the basis for this thesis into the influence of culture on China’s household saving and its effects. By extending Keynes’s General Theory in relation to saving, and incorporating studies from both the Chinese and Western scholarly traditions, five themes are identified as influencing the cultural preferences of China’s household saving. These are: (i) precautionary motives; (ii) habit formation; (iii) children’s education; (iv) consumer credit; and (v) teaching thrift. The holistic approach of this study has allowed a deeper understanding of the role of cultural values on agency and structure in economic events and their subsequent impact on household saving. Results of this investigation indicate that the Confucian value of family ties and ‘Zhong Yong’ – the Golden Mean, which translates essentially as balance, enable Chinese households to save. This development has highlighted a growing tension, in China’s modernity process, between the traditional Confucian value of thrift and the Western cultural influence of stimulating economic growth by consumption. After consideration of current saving practices and the anticipation of economic changes, this research advocates the striking of a balance between household saving and increasing consumption in China in order to avert a future financial crisis and to facilitate economic growth. The implication of this research is that finding a balance between household saving and consumption is crucial to sustainable future development in China as it shifts its development focus from investment and export-led to domestic consumption-driven growth and social development.
- Description: Doctor of Philosophy
Development and evaluation of optimization based data mining techniques analysis of brain data
- Authors: Zarei, Mahdi
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Neuroscience is an interdisciplinary science which deals with the study of structure and function of the brain and nervous system. Neuroscience encompasses disciplines such as computer science, mathematics, engineering, and linguistics. The structure of the healthy brain and representation of information by neural activity are among most challenging problems in neuroscience. Neuroscience is experiencing exponentially growing volumes of data obtained by using different technologies. The investigation of such data has tremendous impact on developing new and improving existing models of both healthy and diseased brains. Various techniques have been used for collecting brain data sets for addressing neuroscience problems. These data sets can be categorized into two main groups: resting-state and state-dependent data sets. Resting-state data is based on recording the brain activity when a subject does not think about any specific concept while state-dependent data is based on recording brain activity related to specific tasks. In general, brain data sets contain a large number of features (e.g. tens of thousands) and significantly fewer samples (e.g. several hundred). Such data sets are sparse and noisy. In addition to these problems, brain data sets have a few number of subjects. Brains are very complex systems and data about any brain activity reflects very complex relationship between neurons as well as different parts of the brain. Such relationships are highly nonlinear and general purpose data mining algorithms are not always efficient for their study. The development of machine learning techniques for brain data sets is an emerging research area in neuroscience. Over the last decade, various machine learning techniques have been developed for application to brain data sets. In the meantime, some well-known algorithms such as feature selection and supervised classification have been modified for analysis of brain data sets. Support vector machines, logistic regression, and Gaussian Naive Bayes classifiers are widely used for application to brain data sets. However, Support vector machines and logistic regression algorithms are not efficient for sparse and noisy data sets and Gaussian Naive Bayes classifiers do not give high accuracy. The aim of this study is to develop new and modify the existing data mining algorithms for the analysis brain data sets. Our contribution in this thesis can be listed as follow: 1. Development of new algorithms: 1.1. Development of new voxel (feature) selection algorithms for Functional magnetic resonance imaging (fMRI) data sets, and evaluation of these algorithms on the Haxby and Science 2008 data sets. 1.2. Development of new feature selection algorithm based on the catastrophe model for regression analysis problems. 2. Development and evaluation of different versions of the adaptive neuro-fuzzy model for the analysis of the spike-discharge as a function of other neuronal parameters. 3. Development and evaluation of the modified global k-means clustering algorithm for investigation of the structure of the healthy brain. 4. Development and evaluation of region of interest (ROI) method for analysis of brain functionalconnectivity in healthy subjects and schizophrenia patients.
- Description: Doctor of Philosophy
- Authors: Zarei, Mahdi
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Neuroscience is an interdisciplinary science which deals with the study of structure and function of the brain and nervous system. Neuroscience encompasses disciplines such as computer science, mathematics, engineering, and linguistics. The structure of the healthy brain and representation of information by neural activity are among most challenging problems in neuroscience. Neuroscience is experiencing exponentially growing volumes of data obtained by using different technologies. The investigation of such data has tremendous impact on developing new and improving existing models of both healthy and diseased brains. Various techniques have been used for collecting brain data sets for addressing neuroscience problems. These data sets can be categorized into two main groups: resting-state and state-dependent data sets. Resting-state data is based on recording the brain activity when a subject does not think about any specific concept while state-dependent data is based on recording brain activity related to specific tasks. In general, brain data sets contain a large number of features (e.g. tens of thousands) and significantly fewer samples (e.g. several hundred). Such data sets are sparse and noisy. In addition to these problems, brain data sets have a few number of subjects. Brains are very complex systems and data about any brain activity reflects very complex relationship between neurons as well as different parts of the brain. Such relationships are highly nonlinear and general purpose data mining algorithms are not always efficient for their study. The development of machine learning techniques for brain data sets is an emerging research area in neuroscience. Over the last decade, various machine learning techniques have been developed for application to brain data sets. In the meantime, some well-known algorithms such as feature selection and supervised classification have been modified for analysis of brain data sets. Support vector machines, logistic regression, and Gaussian Naive Bayes classifiers are widely used for application to brain data sets. However, Support vector machines and logistic regression algorithms are not efficient for sparse and noisy data sets and Gaussian Naive Bayes classifiers do not give high accuracy. The aim of this study is to develop new and modify the existing data mining algorithms for the analysis brain data sets. Our contribution in this thesis can be listed as follow: 1. Development of new algorithms: 1.1. Development of new voxel (feature) selection algorithms for Functional magnetic resonance imaging (fMRI) data sets, and evaluation of these algorithms on the Haxby and Science 2008 data sets. 1.2. Development of new feature selection algorithm based on the catastrophe model for regression analysis problems. 2. Development and evaluation of different versions of the adaptive neuro-fuzzy model for the analysis of the spike-discharge as a function of other neuronal parameters. 3. Development and evaluation of the modified global k-means clustering algorithm for investigation of the structure of the healthy brain. 4. Development and evaluation of region of interest (ROI) method for analysis of brain functionalconnectivity in healthy subjects and schizophrenia patients.
- Description: Doctor of Philosophy
Effective leadership behaviours to manage people issues of cross border mergers and aquisitions in China
- Authors: Wang, Jian
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The aim of this research is to identify the effective leadership behaviours in managing people issues of a British-Chinese cross border acquisition case study in China. There are three areas involved in this study: people issues in mergers and acquisitions (M&As), cross culture differences and cross culture leadership. The knowledge gap identified from past research is that there appears to be no in-depth empirical study to date on an integrated model of the three areas noted above to have a holistic understanding of their influence on the success or failure of M&As, especially in the context of cross border M&As in China. This is the focus of this research. The objectives of this research are to identify how leaders have managed cross culture issues, communications, employees’ resistance, stress and trust in a Western-Chinese cross border acquisition as well as the perceived effectiveness of these leadership behaviours both from the perspectives of Chinese employees and the western managers. The conceptual framework of this research adopted and built on the theoretical model of Project GLOBE. Findings from this study suggest a ‘multiplier’ effect with impact across all the people issues in this cross border acquisition, which means that when one people issue is not managed well by the leadership team, other people issues are triggered. The outcome of this acquisition was influenced by the integrated and holistic effect of all the people issues. In this study, management of people issues in a cross-culture environment was fundamental. There are seven culture dimensions proposed by this study to measure the organisational culture differences pre- and post-acquisition as influenced by both Chinese and British cultures. Specific cultural behaviours related to the proposed seven culture dimensions were also identified. Organisation culture clash was found with the post-acquisition organisation culture which influenced the leadership behaviours in managing the people issues and the perceived effectiveness of the leadership behaviours. This study contributes to existing knowledge by adding the integrated dimension of effective leadership behaviours in managing people issues in a cross culture context of M&As in China as well as extending the theoretical model of Project GLOBE. The practical learning from this study could help leaders in future M&As to take effective actions in managing people issues to improve the success rate of cross border M&As in China which can potentially contribute to the economic development of China and other developing countries.
- Description: Doctor of Philosophy
- Authors: Wang, Jian
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The aim of this research is to identify the effective leadership behaviours in managing people issues of a British-Chinese cross border acquisition case study in China. There are three areas involved in this study: people issues in mergers and acquisitions (M&As), cross culture differences and cross culture leadership. The knowledge gap identified from past research is that there appears to be no in-depth empirical study to date on an integrated model of the three areas noted above to have a holistic understanding of their influence on the success or failure of M&As, especially in the context of cross border M&As in China. This is the focus of this research. The objectives of this research are to identify how leaders have managed cross culture issues, communications, employees’ resistance, stress and trust in a Western-Chinese cross border acquisition as well as the perceived effectiveness of these leadership behaviours both from the perspectives of Chinese employees and the western managers. The conceptual framework of this research adopted and built on the theoretical model of Project GLOBE. Findings from this study suggest a ‘multiplier’ effect with impact across all the people issues in this cross border acquisition, which means that when one people issue is not managed well by the leadership team, other people issues are triggered. The outcome of this acquisition was influenced by the integrated and holistic effect of all the people issues. In this study, management of people issues in a cross-culture environment was fundamental. There are seven culture dimensions proposed by this study to measure the organisational culture differences pre- and post-acquisition as influenced by both Chinese and British cultures. Specific cultural behaviours related to the proposed seven culture dimensions were also identified. Organisation culture clash was found with the post-acquisition organisation culture which influenced the leadership behaviours in managing the people issues and the perceived effectiveness of the leadership behaviours. This study contributes to existing knowledge by adding the integrated dimension of effective leadership behaviours in managing people issues in a cross culture context of M&As in China as well as extending the theoretical model of Project GLOBE. The practical learning from this study could help leaders in future M&As to take effective actions in managing people issues to improve the success rate of cross border M&As in China which can potentially contribute to the economic development of China and other developing countries.
- Description: Doctor of Philosophy
Enculturated beliefs: A grounded theory inquiry into club rugby coaching in Australia, South Africa and New Zealand
- Authors: Hassanin, Remy
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Due to the enduring positivist assumptions underpinning them, coach education programs typically have overlooked the importance of experience as a powerful influence for developing as a sports coach Despite growing recognition of the links between past experience and current coaching pedagogy, little empirical research has focused precisely on how lived experience influences coaching beliefs or practices. Using a constructivist grounded theory methodology, this study investigated the influence of culture on coaching beliefs and how these manifest in the discourse of coaching in a site-specific context. It further examined how beliefs of coaching develop from the experience of playing and coaching in three different countries. Interviews, completed with coaches in the highest levels of club competition m Australia, South Africa and New Zealand, provided the primary data source. Findings demonstrated that beliefs about coaching are profoundly shaped by participation in the practices of rugby as players, and then coaches, in local cultures. The results identified unique differences across the sites of study. These differences were intimately linked with the cultural context within which each coach learned to play and coach Briefly, the Australian coaches valued decision-making and had strong views of rugby as entertainment; the South African coaches prioritised respect and authority; and the New Zealand coaches cherished humility and sense of belonging. . Despite the unique characteristics of each of the coach's beliefs, the notion of rugby as a vehicle for developing character, and teaching moral lessons rooted in the nineteenth century schools of the rising English middle classes, formed a powerful influence across all sites. The coaches' local ised bel iefs interacted with, and were shaped by, the remarkbly resilient global discourse of the " amateur ideal" and it's associated values. Its influence was, however, distinct at each site. The findings indicate that coaches' beliefs adapted to, and were moulded by, local cultural contexts and a broader national ethos resulting in discrete differences in each context on coaches' development of beliefs about coaching , while highlighting the complex and dynamic ways in which local and global cultures interact. As a result of thes interaction, unique conditions are created , manifesting in indvidua; discourse and beliefs about rugby coaching.
- Description: Doctor of Philosophy
- Authors: Hassanin, Remy
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Due to the enduring positivist assumptions underpinning them, coach education programs typically have overlooked the importance of experience as a powerful influence for developing as a sports coach Despite growing recognition of the links between past experience and current coaching pedagogy, little empirical research has focused precisely on how lived experience influences coaching beliefs or practices. Using a constructivist grounded theory methodology, this study investigated the influence of culture on coaching beliefs and how these manifest in the discourse of coaching in a site-specific context. It further examined how beliefs of coaching develop from the experience of playing and coaching in three different countries. Interviews, completed with coaches in the highest levels of club competition m Australia, South Africa and New Zealand, provided the primary data source. Findings demonstrated that beliefs about coaching are profoundly shaped by participation in the practices of rugby as players, and then coaches, in local cultures. The results identified unique differences across the sites of study. These differences were intimately linked with the cultural context within which each coach learned to play and coach Briefly, the Australian coaches valued decision-making and had strong views of rugby as entertainment; the South African coaches prioritised respect and authority; and the New Zealand coaches cherished humility and sense of belonging. . Despite the unique characteristics of each of the coach's beliefs, the notion of rugby as a vehicle for developing character, and teaching moral lessons rooted in the nineteenth century schools of the rising English middle classes, formed a powerful influence across all sites. The coaches' local ised bel iefs interacted with, and were shaped by, the remarkbly resilient global discourse of the " amateur ideal" and it's associated values. Its influence was, however, distinct at each site. The findings indicate that coaches' beliefs adapted to, and were moulded by, local cultural contexts and a broader national ethos resulting in discrete differences in each context on coaches' development of beliefs about coaching , while highlighting the complex and dynamic ways in which local and global cultures interact. As a result of thes interaction, unique conditions are created , manifesting in indvidua; discourse and beliefs about rugby coaching.
- Description: Doctor of Philosophy
Enhancing integration of specialised exercise training into coach practice to prevent lower-limb injury : Using theory and exploring coaches' salient beliefs
- Authors: McGlashan, Angela
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Lower limb injuries (LLIs) are common in community-Australian football (CAF) and specialised exercise training (SET) programs can reduce their incidence. Despite the protection SET programs afford, the use of SET by coaches in CAF contexts, who play a key role in the preparation of players, is largely unknown. The overall purpose of this thesis research was to explore and describe: (1) the contextual and specific nature of CAF coaching practices, and, (2) the factors central to understanding whether or not coaches will make changes in their training practices in the future. Thereby, assisting to devise effective behaviour change and implementation strategies that maximise future integration (adoption and maintainence) of SET programs in CAF contexts to reduce the risk of LLIs for players. This mixed methods research was underpinned by a combination of behavioural and social science theories and models (BSSTM). Coaches’ were sampled from CAF clubs in Victoria and Western Australia. Eligible coaches completed cross-sectional questionnaires pre (n=31) and post (n=28) season in 2007/08. Three coaches engaged in semi-structured, in-depth interviews, 12-18 months later. At preseason, 58% of coaches used injury prevention strategies with their team. Only 69% of them had a formal training plan for the entire season, and most did not explicitly incorporate SET programs, despite their views being favourable towards the latter. Coaches believed their players had a high chance of sustaining a LLI and that LLI could have serious consequences. They believed it was important to have current knowledge of SET programs, but many lacked the behavioural capability and self-efficacy to implement SET programs. They also reported that player attendance at training could also impact on SET program outcomes. Postseason findings were similar with generally positive SET outcome expectancies; many coaches reported they intended to modify SET program implementation in future seasons. Suggested improvements related to collaboration, feedback/reinforcement approaches, education and other sociocultural themes. Coaches reported divergent views about their self-efficacy in relation to SET program implementation but were motivated by what their players thought. Qualitative analysis of the in-depth interviews identified four main themes (and associated coach salient beliefs) that supported and extended quantitative findings. These included: (1) the development of coach behavioural capability/self-efficacy (including informal and formal learning sources), (2) biopsychosocial risk perceptions regarding players’ injury susceptibility, (3) facilitators and hindrances to adopting/maintaining SET, and (4) cues to action/planning. The promotion of SET programs to reduce the susceptibility of LLIs and ensure safe and sustainable participation in AF is important. This thesis has captured a complexity of factors that can be used to enhance and facilitate CAF coaches’ adoption and maintenance of SET, alongside wider-prevention efforts. Future research should continue to use a range of BSSTM and methodological approaches, and devise and evaluate the efficacy of a comprehensive taxonomy of cognitive-behavioural strategies, to provide more insight into effective translation of SET programs into practice. Coaches and their players will be safer if such work continues.
- Description: Doctor of Philosophy
- Authors: McGlashan, Angela
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: Lower limb injuries (LLIs) are common in community-Australian football (CAF) and specialised exercise training (SET) programs can reduce their incidence. Despite the protection SET programs afford, the use of SET by coaches in CAF contexts, who play a key role in the preparation of players, is largely unknown. The overall purpose of this thesis research was to explore and describe: (1) the contextual and specific nature of CAF coaching practices, and, (2) the factors central to understanding whether or not coaches will make changes in their training practices in the future. Thereby, assisting to devise effective behaviour change and implementation strategies that maximise future integration (adoption and maintainence) of SET programs in CAF contexts to reduce the risk of LLIs for players. This mixed methods research was underpinned by a combination of behavioural and social science theories and models (BSSTM). Coaches’ were sampled from CAF clubs in Victoria and Western Australia. Eligible coaches completed cross-sectional questionnaires pre (n=31) and post (n=28) season in 2007/08. Three coaches engaged in semi-structured, in-depth interviews, 12-18 months later. At preseason, 58% of coaches used injury prevention strategies with their team. Only 69% of them had a formal training plan for the entire season, and most did not explicitly incorporate SET programs, despite their views being favourable towards the latter. Coaches believed their players had a high chance of sustaining a LLI and that LLI could have serious consequences. They believed it was important to have current knowledge of SET programs, but many lacked the behavioural capability and self-efficacy to implement SET programs. They also reported that player attendance at training could also impact on SET program outcomes. Postseason findings were similar with generally positive SET outcome expectancies; many coaches reported they intended to modify SET program implementation in future seasons. Suggested improvements related to collaboration, feedback/reinforcement approaches, education and other sociocultural themes. Coaches reported divergent views about their self-efficacy in relation to SET program implementation but were motivated by what their players thought. Qualitative analysis of the in-depth interviews identified four main themes (and associated coach salient beliefs) that supported and extended quantitative findings. These included: (1) the development of coach behavioural capability/self-efficacy (including informal and formal learning sources), (2) biopsychosocial risk perceptions regarding players’ injury susceptibility, (3) facilitators and hindrances to adopting/maintaining SET, and (4) cues to action/planning. The promotion of SET programs to reduce the susceptibility of LLIs and ensure safe and sustainable participation in AF is important. This thesis has captured a complexity of factors that can be used to enhance and facilitate CAF coaches’ adoption and maintenance of SET, alongside wider-prevention efforts. Future research should continue to use a range of BSSTM and methodological approaches, and devise and evaluate the efficacy of a comprehensive taxonomy of cognitive-behavioural strategies, to provide more insight into effective translation of SET programs into practice. Coaches and their players will be safer if such work continues.
- Description: Doctor of Philosophy