Description:
Data mining is about solving problems by analyzing data that present in databases. Supervised and unsupervised data classification (clustering) are among the most important techniques in data mining. Regression analysis is the process of fitting a function (often linear) to the data to discover how one or more variables vary as a function of another. The aim of clusterwise regression is to combine both of these techniques, to discover trends within data, when more than one trend is likely to exist. Clusterwise regression has applications for instance in market segmentation, where it allows one to gather information on customer behaviors for several unknown groups of customers. There exist different methods for solving clusterwise linear regression problems. In spite of that, the development of efficient algorithms for solving clusterwise linear regression problems is still an important research topic. In this thesis our aim is to develop new algorithms for solving clusterwise linear regression problems in large data sets based on incremental and nonsmooth optimization approaches. Three new methods for solving clusterwise linear regression problems are developed and numerically tested on publicly available data sets for regression analysis. The first method is a new algorithm for solving the clusterwise linear regression problems based on their nonsmooth nonconvex formulation. This is an incremental algorithm. The second method is a nonsmooth optimization algorithm for solving clusterwise linear regression problems. Nonsmooth optimization techniques are proposed to use instead of the Sp¨ath algorithm to solve optimization problems at each iteration of the incremental algorithm. The discrete gradient method is used to solve nonsmooth optimization problems at each iteration of the incremental algorithm. This approach allows one to reduce the CPU time and the number of regression problems solved in comparison with the first incremental algorithm. The third algorithm is an algorithm based on an incremental approach and on the smoothing techniques for solving clusterwise linear regression problems. The use of smoothing techniques allows one to apply powerful methods of smooth nonlinear programming to solve clusterwise linear regression problems. Numerical results are presented for all three algorithms using small to large data sets. The new algorithms are also compared with multi-start Sp¨ath algorithm for clusterwise linear regression.
Description:
Medium sized workplaces are often grouped with small enterprises, yet they can have unique characteristics compared to more intensively studied small and large organisations, however, these differences are often not clearly recognised. The food processing industry is often part of the small and medium sized enterprises (SME) group and has a higher rate of accidents, injury and disease compared with many other industry groups. To improve safety performance in medium enterprises (within the food processing industry), there is a need to identify the perceived barriers to improving OHS amongst managers, supervisors, and process workers. This research provides a unique insider’s point of view of a food packing room within a food manufacturing plant in Melbourne. It is a single case design study, focusing on a specific medium sized enterprise, using insider research and an ethnographic approach to gain a greater understanding of the perceived barriers to improving OHS. The first part of this research focused on understanding the safety culture of the organisation, from different hierarchical perspectives, using Hudson’s Evolution of Safety Cultures model. The second part utilised the Health Belief model to identify the barriers to improving OHS from multiple perspectives of managers, supervisors and process workers. Following the analysis of the results, five barriers were identified: (i) fragmentation of group perspectives; (ii) poor communication between and within the hierarchical groups; (iii) limited OHS training and competency; (iv) inadequate management commitment to OHS; and (v) lack of empowerment. This created tensions amongst and between the groups. However, further examination of these findings suggested a deeper reason for the difficulty in improving the OHS, which was affecting the organisation. The most significant barrier to improving OHS at this workplace was the learned helplessness that had developed over a period of time and had filtered through all hierarchical groups. A reflection on the choice of methodology (insider research) and the importance of ethical considerations and the depth of meaning that was drawn from this research has been presented in this thesis. Learned helplessness has been discussed in the context of a medium sized enterprise and its significance to the contribution to OHS literature. Recommendations have been provided in terms of addressing learned helplessness within a medium sized enterprise, by changing the way individuals think, using learned optimism. Other changes that have been presented have included organisation design, facilitating improved communication and goal setting, and the investigation into the supporting role of supply chains toward OHS initiatives.
Description:
"Longitudinal studies, where data is collected by measuring the same experimental units several times over a relatively long period, are becoming increasingly common. Conventional statistical approaches have limitations when applied to the analysis of longitudinal data ... Practical limitations of longitudinal analysis that relate to missing data and large data set sizes were explored in this thesis with the application of a sampling technique known as Ranked Set Sampling (RSS). We developed this sampling method, which has not previously been applied to longitudinal data, for fixed and mixed-effects models. This thesis also illustrated inference techniques to estimate these models after selecting sample units by RSS."
Description:
Classification of objects based on inherent properties is a general problem area encountered in diverse fields of knowledge. In terms of text classification, the problem presented in this work is based on two particular criteria for documents as given below: • Informativeness of feature sets - A feature set would comprise of words in a document. Presence of words that can be used to characterize a document in a corpus (database) is the informativeness of a feature set. • Multilabelness - documents can have content dealing with diverse topics These criteria are not localized to documents only, but can be generalized to other areas as well with little adaptation. In this thesis, the classification problem that is being investigated involve datasets containing the prescence of smaller number of features associated with a larger number of classes. The acronym SFML (Shorter Featured & Multi-Labeled) has been used to denote these types of datasets. Further, SFML type datasets can be encountered in various walks of life, like Medicine, SMS Services, Text Classification to name a few. In this thesis, the performance of various existing classification algorithms were tested on SFML datasets and their results compared. Further, a new classification algorithm based on optimization is also proposed for these types of datasets. Applications to the Adverse Drug Reaction problem and phishing profiling problem have been considered here. Classification results show that the proposed algorithm performs better than existing classification algorithms as the number of features tend to decrease.
Description:
With the movement to evolving classroom practices and pedagogies to enhance student-centered learning environments across all Key Learning Areas, there has been growing concern about how educators can produce high quality, intellectual learning experiences within physical education. To provide much-needed understanding of teachers' experiences of the implementation of a TGfU (Teaching Games for Understanding) teaching approach, this study aimed to identify the ways in which individual teachers, adopt, embrace or alternatively resist TGfU as an innovative pedagogy. - Taken from abstract.
Description:
"As a result of complex social, economic and legislative factors, the number of children in shared time arrangements (in which children spend equal, or near-equal time, with both parents post-separation) has risen steadily and incrementally in Australia and internationally. Despite the increasing numbers of children in this arrangement, conceptualisations of and discussions about shared care remain largely devoid of children's perspectives about their experiences. As a result, little is known about how children experience this way of living. This study used a descriptive phenomenological approach to explore latency aged (aged 8-12) children's lived experience of security and contentment, and their absence, in a shared care time arrangement." "Interviews were conducted with sixteen children across a diversity of living arrangements (levels of parental cooperation and conflict; self-selected and Court-ordered; day-to-day patterns) who had current or recent experience living in shared care. From this pool of interviews, the eight richest and detailed protocols were selected for descriptive phenomenological analysis. Through a process of detailed analytic exploration of these eight individual descriptions of phenomena under investigation (security and contentment in shared care; the absence of security and contentment in shared care), the core constituents of each phenomenon were discerned. From these, General Structures representing the essence, or the invariants common to all experiences under investigation, were identified. This thesis introduces a child-generated phenomenology of security and contentment, and their absence, in shared care. This phenomenology is based on the careful analysis of children's pre-reflective narrative descriptions, describing core aspects of this arrangement that contribute to their felt security and contentment, and core aspects that compromise it. Ultimately, this thesis presents the child's lived experience of feeling securely shared by parents in the context of a shared time living arrangement. "
Description:
In this research I have explored the transition experience of first year on-campus residential students and the challenges faced during the early phase of living in the two on-campus halls of residence in one rural Australian university."
Description:
This dissertation reports on an empirical study of the management of knowledge and technology transfer by Chinese companies acquiring product, process and organizational knowledge from overseas partners.
Description:
This dissertation reports on an empirical study of the management of knowledge and technology transfer by Chinese companies acquiring product, process and organizational knowledge from overseas partners.
Description:
"The main part of this thesis presents a new approach to the topic of conjugation, with applications to various optimization problems. It does so by introducing (what we call) G-coupling functions."
Description:
Harder kernels in barley are thought to be a factor affecting the modification of the endosperm during malting by restricting water and enzyme movement within the endosperm. The traditional method used in the malting industry to determine barley endosperm vitreousness is by visual assessment. Since this method is subjective, laborious and requires training, an alternative method is needed. Similarly, the causes and factors influencing kernel hardness are uncertain. The prime objectives of this study were: to identify an appropriate method to quantify kernel hardness; investigate the relationship between kernel hardness and endosperm composition; and to investigate the relationship between barley variety and environmental influences on endosperm composition in relation to the kernel hardness of malting barley.
Description:
Harder kernels in barley are thought to be a factor affecting the modification of the endosperm during malting by restricting water and enzyme movement within the endosperm. The traditional method used in the malting industry to determine barley endosperm vitreousness is by visual assessment. Since this method is subjective, laborious and requires training, an alternative method is needed. Similarly, the causes and factors influencing kernel hardness are uncertain. The prime objectives of this study were: to identify an appropriate method to quantify kernel hardness; investigate the relationship between kernel hardness and endosperm composition; and to investigate the relationship between barley variety and environmental influences on endosperm composition in relation to the kernel hardness of malting barley.
Description:
Reports on a qualitative, case-based study of the practices that contribute to the growth of Small to Medium Enterprises (SMEs). The research engaged with growing SMEs located in regional areas of Australia, and with the entrepreneurs and owner-managers who lead them.
Description:
This study contributes to corporate reputation theory through the identification of stakeholder specific reputations in the mining industry and further understanding of the complex reputation formation processes. It provides a framework for understanding the formation of reputation at stakeholder level, including the stakeholder network effects and the industry effects in the reputation formation processes for stakeholder groups
Description:
The aim of the present study was to gain an understanding of the experience of treatment via an Internet-based cognitive behavioural self-help protocol for social anxiety disorder. Participants were four adults, aged between 22-46 years, who fulfilled DSM-IV-TR crriteria for a diagnosis of social anxiety disorder.
Description:
Automated positioning systems designed to measure three-dimensional locations of objects are of paramount importance to flexible manufacturing applications. These systems should perform in an industrial environment, withstanding obstacles of solid objects and must be immune from external influences including changes in atmospheric conditions and surrounding noise. Automated positioning systems should also be free of mechanical contact and able to perform without having to establish a line-of-sight with the measured object. In this thesis, a novel design is proposed for the spatial measurement of the six degrees of freedom industrial robots and autonomous vehicles. Not only does the proposed system comply with the above characteristics, but it is also capable of achieving better resolutions than CCD cameras, easier to implement, safer than laser devices and more accurate than ultrasound systems.[...]
Description:
This thesis argues that European women exercised agency in mid nineteenth century Ballarat. It develops an understanding of women as active agents who engaged with, and negotiated, relationships of power. It highlights the fluidity in gendered roles, the blurred lines between the public and private domains, and the complexity of colonial life and relationships. This social and feminist history situates women within the system of patriarchal power which systematically and overtly benefited men. It reveals the complex operation of patriarchal power in which women accepted, challenged, and resisted social values and constructs. Such a consideration of the structure of power dislodges the notion of women as oppressed bodies who passively accepted universal and monolithic patriarchal values, and instead highlights diversity within gendered power structures. Drawing on public documentation, narrative, biographical, and statistical information from a diverse, extensive, and comprehensive range of archival sources, this thesis utilises a form of microhistorical methodology to detail and analyse the ways in which colonial women helped to shape society. It then draws a broader interpretation from such analysis to locate this thesis among other feminist and goldfields discourses. Through the central themes of health, birth, death, marnage, family, law, religion, temperance, philanthropy, work and public protests, this study_ identifies strands of agency exercised by Ballarat' s colonial women during the city's metamorphosis from the heady early days after the official discovery of payable gold in 1851 and the subsequent expansion of colonial settlement, to the consolidation of the City of Ballarat in 1871. Women predominantly acted as domesticating, nurturing and civilising agents, their actions deriving legitimacy from patriarchal values and endorsed by men. Women also contested, challenged, negotiated, manipulated, resisted and rejected socially accepted values, while playing out their lives within the colonial society in which they lived.
Description:
"The major criticism by hospital trained clinical nurses is that university graduates are perceived as not being competent practioners as a result of limited time spent in clinical areas. This lack of clinical experience is thought to contribute to new graduates' sense of occupational stress."--leaf xii.
Description:
"The major criticism by hospital trained clinical nurses is that university graduates are perceived as not being competent practioners as a result of limited time spent in clinical areas. This lack of clinical experience is thought to contribute to new graduates' sense of occupational stress."--leaf xii.
Description:
"The role of human resource management (HRM), or simply human resource (HR), practitioners has changed dramatically, especially in the last 10 years. As a result of this change in role, as detailed in the literature review, HRM practitioners require appropriate competencies to maintain effectiveness and enhance the value of their contribution to their organisation..." --p. 1.
Description:
"Exotic willows (Salix spp.) are widespread riparian tree species of streams in temperate Australian and New Zealand. In Australian willow species are declared weeds of national significance, yet little is known about the novel habitats they create not the impact on aquatic biota of vegetation change following willow management programs ..." [leaf i]
Description:
Doctor of Philosophy
Description:
"Exotic willows (Salix spp.) are widespread riparian tree species of streams in temperate Australian and New Zealand. In Australian willow speicies are declared weeds of national significance, yet little is known about the novel habitats they create not the impact on aquatic biota of vegetation change following willow management programs ..." [leaf i]