Optimal number and placement of network infrastructure in wireless networks
- Authors: Kouhbor, Shahnaz
- Date: 2007
- Type: Text , Thesis , PhD
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- Description: Wireless Local Area Networks (WLANs) have become a major success in telecommunications during the last few years, due to advantages such as mobility, flexibility, and easier maintenance. A device called an access point (AP) acts as a base station in WLAN for connecting a group of users to the network via radio signal. During the planning of such a network an important problem is to determine the optimal number of these devices and their placement/distribution so that coverage, capacity, and physical security are maximised at minimum cost. In this thesis we are using continuous optimisation techniques to optimise the number of APs and their distribution while cost of deployment is reduced and physical security of the network is enhanced. To find the number and placement of APs, we developed a multi-objective functions model based on path losses and power for free space environments. The two functions in the models are combined by using a balancing parameter. Since it is recognised that some of the objectives can be handled one at a time, in another approach, we followed a step-by-step procedure. We start with a novel optimisation model based on path losses for indoor environments including obstacles. Cost of deployment is saved by finding the minimum number of APs ensuring that the path loss at each test point/receiver is below the given maximum path loss. Next, the physical security of the network is enhanced by placing the APs far from places accessible to unauthorised users to reduce the risk of intrusion into the network. This is achieved in the framework of the model by introducing potential unauthorised users in unauthorised areas for whom coverage is minimised. Due to the presence of obstacles in indoor buildings, the path loss function is discontinuous. Therefore, the objective functions are very complicated and most of the existing optimisation algorithms cannot be applied to solve the problem. We use a global optimisation algorithm that is not used by other researchers to solve the same problem. To validate the accuracy of the optimisation model and performance of the numerical methods, we run tests on several indoor buildings and use wide range of WLAN parameters. The results demonstrate the quality of our model and algorithm. Based on the proposed model and algorithm, we developed a software to assist the network designers in planning wireless LANs.
- Description: Doctor of Philosophy
OH&S in small business : Influencing the decision makers : The application of a social marketing model to increase the uptake of OHS risk control
- Authors: Cowley, Stephen
- Date: 2006
- Type: Text , Thesis , PhD
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- Description: Losses resulting from traumatic injuries and occupational disease are prevalent in the small business sector of Australian industry. Although the true size of the problem is unclear, it is estimated that the losses amount to more than $8 billion annually. The hazard control measures to counter these losses are largely known and are available to small businesses but they are not widely adopted. Regulators and other bodies have employed a range of intervention strategies to influence decision-makers in small businesses but most have focussed on the dissemination of printed materials or broadbased advertising campaigns with limited success......... The research concludes that the listening processes at the heart of social marketing add to the methods already used in the OHS discipline by forcing the marketer to listen to the subjective assessment of risk as perceived by targets as well as to question the evidence base that supports the legitimacy and efficacy of the proposed intervention. The TTM was found to be a useful means of categorising small business decision-maker behaviour and assessing the readiness for change of individuals and therefore the messages that are needed to unfreeze behaviour. The TTM also provides a tool for evaluation of the impact of an intervention.As a result of this research it is suggested that opinion leaders, who are employed within a social marketing model to diffuse information, multiply the effort of those wishing to increase the adoption of an innovation. Thus engagement of opinion leaders by an OHS authority for the communication of risk control messages may be more cost-effective than attempting to visit every workplace within an industry group. Thus, although social marketing is not in the general repertoire of OHS interventions, it appears to be extremely useful as a framework for interventions and, when used in concert with a stages of change model, provides natural lead indicators for evaluating the impact of OHS interventions. Application of social marketing to people who have the responsibility for the health and safety of others was unique.
- Description: Doctor of Philosphy
Non-linear analogues of Lagrange functions in constrained optimization
- Authors: Giri, Jason
- Date: 2005
- Type: Text , Thesis , PhD
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- Description: "This thesis investigates several non-linear analogues of Lagrange functions in the hope of answering the question 'Is it possible to generalise Lagrange functions such that they may be applied to a range of nonconvex objective problems?' The answer to this question is found to be yes for a particular class of optimization problems. Furthermore the thesis asserts that in derivative free optimization the general schema which is most theoretically and practically appealing involves the reformulation of both objective and constraint functions, whilst the least practically successful approach for everything but the most simple convex case is the augmented Lagrangian approach."
- Description: Doctor of Philosophy
Multiculturalism : (re) intellectualising teaching
- Authors: Edmonds, George
- Date: 2007
- Type: Text , Thesis , PhD
- Full Text:
- Description: Doctor of Philosphy
Monitoring the impact of occupational health and safety education
- Authors: Thatcher, Anthony
- Date: 2006
- Type: Text , Thesis , PhD
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- Description: "This research investigated whether engineers, graduating from universities more than a decade after the introduction new occupational health and safety (OHS) legislation in Australia, were being equipped with the knowledge and skills to fulfil their professional, legal and moral responsibilities in relation to occupational health and safety. The study focussed on engineering students as future business leaders and designers of working environments. An instrument was designed to examine the ability of OH&S education to affect decision-making and problem solving competence in engineering students and graduates. The study found that engineering graduates in the 1990's were departing [from] their academic institutions with superficial knowledge of occupational health and safety responsibilities and accountability in the workplace. The evaluative tool identified an absence of safety management skills and knowledge within graduate and student engineer groups and an extensive urge to blame and discipline the victim or blame a government regulatory authority. The research found that although occupational health and safety professionals adopt a strategy of a safe work place rather than place emphasis on individual workers the engineers did not adopt the safe place approach and focussed on the person. It is recommended that the evaluative tool or a derivative of it should be used to evaluate the extent to which our community progresses in developing the vital OHS decision-making skills of the people who will manage and design workplaces." --p.ii.
- Description: Doctor of Philosophy (PhD)
Model free operational space control of mechanical manipulators
- Authors: Saleem, Muhammad Saad
- Date: 2009
- Type: Text , Thesis , PhD
- Full Text:
- Description: Doctor of Philosophy
Mental health of older adults : the development and testing of a model
- Authors: Turner, Jayne
- Date: 2006
- Type: Text , Thesis , PhD
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- Description: The high rates of depression and suicide among older adults have given rise to research which aims to identify factors that protect older people from mental illness. Recently, Bailey and McLaren (2005) developed and tested a model which investigated the relationships between engagement in various leisure activities performed alone or with others, sense of belonging, depression, and suicidal ideation. The present study examined an extended version of the mental health model, incorporating the additional variables of perceived freedom in leisure and physical health status. A sample of Australian males and females (N = 379) aged 65 years and over (M age = 77.23, SD = 7.48) completed the Perceived Freedom in Leisure Questionnaire, the Yale Physical Activity Survey,the Duke Health Profile, the Sense of Belonging Instrument, the Centre for Epidemiological Studies-Depressive Scale, and the Suicide Subscale of the General Health Questionnaire. Results indicated that the model was invariant for gender, and accounted for 56% of the variance in suicidal ideation. The model indicated that physical health had direct relationships with each variable in the model. Perceived freedom in leisure predicted engagement in physical activity, sense of belonging-antecedent, and depression, whereas sense of belonging psychological state predicted depression and suicidal ideation. Results suggest that interventions aimed at improving older adults’ perceptions of freedom and personal choice with regard to their leisure experiences, maintaining optimal health, and increasing opportunities to foster feelings of belonging and relatedness with others, should protect against the development of mental ill health.
- Description: Doctor of Psychology (Clinical)
Men's perceptions of health: Implications for the delivery of health education programs in Victoria
- Authors: Gracie, Neil
- Date: 2009
- Type: Text , Thesis , PhD
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- Description: The key issue of concern behind this study was that there have been recent concerns about the gender-based discrepancies in morbidity and mortality rates amongst men and the scant attention generally held by Australian men towards their own health and well-being ... the models of education that have emerged from this research as being appropriate for health delivery advice to urban, rural and disenfranchised men, suggest effective ways to reach out to Australian males.
- Description: Doctor of Education
Mathematical models of dynamic reconfiguration of telecommunication networks
- Authors: Dzalilov, Zari
- Date: 2004
- Type: Text , Thesis , PhD
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- Description: In this thesis we examine mathematical models for dynamical reconfiguration of telecommunication networks. Dynamical configuration is one of the most important problems in the field of network management. In the case of some part of the network being damaged the system should maintain its operations, taking into account the new conditions. This can be achieved by using the residual capacity of the system if it is available. If there were not enough residual capacity, the managers of the system need to involve some of the unaffected traffic in order to reorganize traffic. A prolonged breakdown will push some customers to change their provider; there is also a lost [sic] of profit because of breakdowns, that can be considered as a certain implicit penalty. To reorganize traffic by using new routes we should have a flexible routing system.
- Description: Doctor of Philosophy
Male domestic partner abusers : Typologies and responses to treatment
- Authors: Scott, Wayne
- Date: 2006
- Type: Text , Thesis , PhD
- Full Text: false
- Description: "Although awareness of the pervasiveness and significance of partner abuse has been growing, little data exist on matching type of abusers with specific interventions. The aim of this study was to evaluate one example of the empirically based typologies of partner abuse that could lead to improved interventions for abusers."
- Description: Doctor of Psychology (Clinical)
Magic and antimagic labeling of graphs
- Authors: Sugeng, Kiki Ariyanti
- Date: 2005
- Type: Text , Thesis , PhD
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- Description: "A bijection mapping that assigns natural numbers to vertices and/or edges of a graph is called a labeling. In this thesis, we consider graph labelings that have weights associated with each edge and/or vertex. If all the vertex weights (respectively, edge weights) have the same value then the labeling is called magic. If the weight is different for every vertex (respectively, every edge) then we called the labeling antimagic. In this thesis we introduce some variations of magic and antimagic labelings and discuss their properties and provide corresponding labeling schemes. There are two main parts in this thesis. One main part is on vertex labeling and the other main part is on edge labeling."
- Description: Doctor of Philosophy
Littoral macroinvertebrates in relation to native and exotic riparian vegetation in streams of central Victoria, Australia
- Authors: Jayawardana, Chandamali
- Date: 2006
- Type: Text , Thesis , PhD
- Full Text: false
- 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]
Leadership and career aspirations in female and male middle managers : A cross-cultural study in Malaysia and Australia
- Authors: Jogulu, Uma
- Date: 2008
- Type: Text , Thesis , PhD
- Full Text:
- Description: Western research dominates in areas of theories and models which describe organisational behaviours, human resource management and workplace participation. However the 21st century brings new challenges. Findings to-date suggest that attitudes and values are strongly culture specific therefore many facets now require re-thinking by human resource specialists and organisational behavioural theorists. For instance, the globalisation of the market economy has dramatically changed the contemporary business environment. As a direct consequence of the globalisation process, the nature of organisational structures and workforce diversity has also changed. Such changes may make the application of Western theories less relevant to explain behaviours and attitudes of contemporary employees around the world. Therefore, there is a need for expanding our cross-cultural understanding in order to provide practical knowledge to enhance people and business management so that organisations can remain successful nationally and internationally. Comparative cross-cultural studies are required to expand on Western theories and models. The present study acknowledged and regarded the importance of cross-cultural studies to date, and endeavoured to expand on the extant knowledge by providing specific information relating to two diverse countries. The aim of the research project is to examine two measurable areas of organisational behaviours namely leadership styles and managerial career aspirations of female and male managers in Malaysia and Australia to explore the similarities and differences between the groups. The study found differences within and between female and male managers in Malaysia and Australia in terms of leadership styles, perception of effectiveness, perceptions towards managerial career aspirations and perceived promotion opportunities during the quantitative and qualitative data collection stages. The study concludes by providing empirical evidence to refute the universality of Western theories and models in all cultures. The analysis of both quantitative and qualitative data revealed significant differences in terms of values, behaviours and attitudes of managers in the two diverse cultures which have important implications for work and employment. This suggests that Western theories and models of organisational behaviour and workplace participation are not universally applicable, appropriate or relevant in all cultural environments. Implications for theory and practice in the light of an enhanced cross-cultural understanding were recommended.
- Description: Doctor of Philosophy
Integrated clinical pathway of transurethral resection of the prostate : Impact on clinical quality, cost and patient and staff satisfaction
- Authors: Khowaja, Khurshid
- Date: 2004
- Type: Text , Thesis , PhD
- Full Text:
- Description: "The central focus of this study is an investigation into how the implementation of a clinical pathway for the surgical procedure of transurethral resection of the prostate (TURP) impacted on clinical quality, cost, and patient and staff satisfaction at the Aga Khan University Hospital (AKUH) in Pakistan"
- Description: Doctor of Philosophy
Innovation and capacity growth in mental health promotion : Working with the past
- Authors: Crouch, Alan
- Date: 2006
- Type: Thesis , PhD
- Full Text:
- Description: The field of practice addressed by this Portfolio of works is mental health promotion in the context of survival of extreme, organized, armed violence and associated repression. Studies were undertaken in two historical and geo-political settings – Cambodian refugees in Australia post 1979 and Bulgarian post World War II concentration camp survivors after the fall of communism in 1989. The portfolio reports on original image-based research in mental health promotion, using discussions by focus groups composed of genocide and repression survivors. The discourse developed by each group following reflection on a set of photographs from respective conflict periods was used to explore meaning-making within that survivor group.
- Description: Doctor of Health Promotion
Hybrid training approaches to Hidden Markov Model-based acoustic models for automatic speech recognition
- Authors: Huda, Shamsul
- Date: 2008
- Type: Text , Thesis , PhD
- Full Text:
- Description: Doctor of Philosophy
Humour and laughter in children with autism spectrum disorders
- Authors: Jones, Errin
- Date: 2009
- Type: Text , Thesis , PhD
- Full Text:
- Description: Studying humour and laughter in children with ASDs can provide unique insights into their socio-communicative impairments, and aid in the development of effective interventions. The current study investigated humour and laughter in 16 school-aged children with autism and Asperger Syndrome (AS).
- Description: Doctor of Psychology (Clinical)
Harambe : Strategic alliance formation and performance evaluation in the tourism sector of travel
- Authors: Pansiri, Jaloni
- Date: 2006
- Type: Text , Thesis , PhD
- Full Text:
- Description: "This thesis investigates the influence of company and executive characteristics on strategic alliance formation (decision to form alliances, alliance type selection and choice of alliance partners) and performance evaluation of alliances, in the Australian tourism industry sector of travel. The significance of forming strategic alliances as a way of achieving 'harambe' is emphasised throughout this thesis. 'Harambe' is a ki-Swahili term meaning "to pull together, or to work together or to pull the same rope together at the same time" in harmony. The idea here is that companies pool their resources together through strategic alliances to be able to achieve their strategic goals and objectives. The research focuses on three travel sub-sectors - travel agencies, tour operators and wholesalers and how these sub-sectors relate with those of transport and accommodation." -
- Description: Doctor of Philosophy
Graphs and subgraphs with bounded degree
- Authors: Teska, Jakub
- Date: 2008
- Type: Text , Thesis , PhD
- Full Text:
- Description: "The topology of a network (such as a telecommunications, multiprocessor, or local area network, to name just a few) is usually modelled by a graph in which vertices represent 'nodes' (stations or processors) while undirected or directed edges stand for 'links' or other types of connections, physical or virtual. A cycle that contains every vertex of a graph is called a hamiltonian cycle and a graph which contains a hamiltonian cycle is called a hamiltonian graph. The problem of the existence of a hamiltonian cycle is closely related to the well known problem of a travelling salesman. These problems are NP-complete and NP-hard, respectively. While some necessary and sufficient conditions are known, to date, no practical characterization of hamiltonian graphs has been found. There are several ways to generalize the notion of a hamiltonian cycle. In this thesis we make original contributions in two of them, namely k-walks and r-trestles." --Abstract.
- Description: Doctor of Philosophy
Generalist telephone counselling and referral call data as a social indicator : a lifeline to social support?
- Authors: Watson, Robert
- Date: 2006
- Type: Text , Thesis , PhD
- Full Text:
- Description: The aim of this Australian Research Council Linkage doctoral project with industry partners UnitingCare-Lifeline Ballarat and Lifeline Australia was to investigate whether calls to Lifeline – a generalist telephone counselling and referral service – could be used as valid and reliable social indicators of health. The Lifeline Australia service receives approximately 1,000 calls a day and key details of each call are recorded on its Client Services Management Information System (CSMIS). A number of research questions directed this study: (1) What are the characteristics or attributes of callers to Lifeline?; (2) How do the patterns of calls to Lifeline vary spatially?; and (3) What is the statistical relationship between calls to Lifeline and other measures of community health? This thesis presents a detailed descriptive summary and analysis of Lifeline’s national CSMIS call data (N = 90,128 cases) from 01-04-2003 to 29-06-2003. It explores this and other sources of call data, such as the Telstra Exchange data, for their potential to be used as social indicators. The project created a model of generalist telephone counselling and referral use (MGTCRU). The MGTCRU was used as a theoretical base to a call rate indicator, named the Lifeline Indicator of Social Need (LISN), which reflects the community’s capacity to provide social support to its most socially isolated residents. The LISN was found to have useful attributes and a potential for use as a social indicator of community strength. The call rate indicator showed a statistically significant relationship with the Accessibility/Remoteness Index of Australia, measures of socio-economic disadvantage, and suicide rates. However, the CSMIS database was found to have certain limitations. The thesis presents recommendations for this situation to be addressed. While acknowledging that there are limitations to telephone counselling call data it is clear that these call data can be used to create cost effective, rapid, reliable, and potentially valid social indicators. This thesis has made a number of significant empirical and theoretical contributions to knowledge on telephone counselling and referral. The descriptive summary of the CSMIS data provided in this thesis might be used in innovative ways by social researchers. The LISN could be used on its own or included in other social indices. The MGTCRU provides a theoretical framework for understanding telephone counselling and referral services use and may assist these services to organise their operations and meet the needs of their callers. This project may have particular application to a current upgrade of Lifeline Australia’s telephony and call data systems.
- Description: Doctor of Philosophy