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Conference details: The 3rd Pacific-Rim Symposium on Image and Video Technology (PSIVT2009) Tokyo, Japan, January 13th—16th, 2009 http://psivt2009.nii.ac.jp/
Active wave cancellation has the potential to delay laminar-turbulent transition without requiring a large expenditure of control energy, with application to aircraft drag reduction. A methodology is presented for the determination of the optimal location for a synthetic jet actuator used to control Tollmien-Schlichting disturbances with a wave cancellation approach. A direct numerical simulation (DNS) scheme is developed to allow the effect of controls on an at-plate boundary layer to be investigated. Time-periodic wall normal transpiration is used to represent the effect of synthetic jet actuators. An upstream actuator is used to introduce disturbances into the flow and a downstream control actuator is used to cancel the disturbances by anti-phase superposition. A distributed representation of the actuator using a truncated Gaussian ...
Engineering high performance indoor wireless communication systems requires sound system deployment strategies. In order to deploy systems effectively, propagation models that can reliably and yet efficiently characterise radio propagation behaviour are needed. This thesis describes the philosophy, the logical development, and the performance of a mechanistic modelling approach which is intended for use in system planning. In the investigation, the deployment of a single base station in a single-floor office environment is considered. The environment is systematically divided into several generic canonical geometries including an open plan office and corridor, a single corner, a double corner, and a discrete obstacle which are then separately analysed. The dominant mechanisms which govern the energy propagation in each canonical geomet...
In this paper, we analyze the reason behind the use of foreign ownership restrictions on inward Foreign Direct Investment (FDI). We extend the results developed in Karabay (2005) by changing the condition on share distribution in the model. Due to this change, we are able to analyze the political economy aspect of this restrictive policy, i.e., we can study the effect of the host government's welfare preference on the optimal foreign ownership restriction. Since the analytical solution to the optimal share restriction policy cannot be specified in general, we use a numerical approach based on collocation to approximate the solution to the problem. Within this framework, under certain conditions, it turns out that the rent extraction-efficiency trade-off is sharper the less the host government favors the local firm. We show that not onl...
Infant and child mortality has usually been looked at in socio-economic terms, while recent European studies have looked at the loss of a parent and illegitimacy as independent risk factors for early death. But did New Zealand’s new migrant population share these risk factors considering the extremely low child mortality rates and high life expectancy seen in New Zealand compared to Europe at the end of the 19th century? Reconstitution of families who had resided in either Tolaga Bay or Little Akaloa settlements of New Zealand from early colonial times through to the 20th century was undertaken and followed through subsequent generations creating a data base of 2379 individuals. As in Europe the loss of a parent as a child did increase the risks of premature death. The younger an individual became an orphan, the greater the risk of chi...
In this thesis, we investigate the impact of transmission on the strategic behaviour of firms competing in deregulated electricity wholesale markets. Assuming uniform-price auctions and locational marginal pricing, we first investigate the properties of the dispatch problem over networks that are constrained and/or lossy. Without loops and losses we derive important results as to how price varies as a function of demand at each node. Whereas, for networks with loops and losses, we discuss the non-convexity of the dispatch problem and show that the optimal value function may be non-convex. We model the strategic firms as Cournot agents, and discuss how the assumptions surrounding the rationality of the agents can influence the equilibrium outcomes. Under a full-rationality assumption, we prove that over a lossless radial network, with f...
This thesis investigates the behaviour of URM walls subjected to out-of-plane seismic forces, and the study is focused primarily on single-storey and two-storey one-way spanning walls connected to flexible diaphragms. Expressions that describe the intermediate-height cracking of out-of-plane loaded one-way spanning URM walls were formulated, and wall force-displacement behaviour and the sensitivity to various parameters were studied. Crack height was identified to be particularly sensitive to low values of masonry bond strength and/or to low values of applied overburden. Crack height was found to have significant effects on both wall instability displacement and lateral resistance. A comprehensive quasi-static testing programme was developed by subjecting full-scale two-leaf and three-leaf URM walls to out-of-plane uniform forces. The ...
This thesis examines multi-scalar governance of common pool resources in the western and central Pacific. Shifts towards the reconfiguration and rearticulation of the state across spatial scales have created new geographies of governance. Ascertaining whether this reconfiguration toward postsovereign forms of governance has built the resiliency of environmental management systems is of critical importance. Governance and/for the sustainable development of highly migratory fisheries has led to new emergent state spaces at regional levels (through Regional Fisheries Management Organisations) furthering power and control over local resources and as such, environmental degradation. Employing post-structural political ecology and concepts of scalar politics as an epistemological framework, I examine how multi-scalar governance of fugitive c...
The aim of this study was to contribute to the emerging interest and body of knowledge regarding obesity prevention in Pacific communities who have an affiliation with Christian religions, and provide evidence to inform public health policy and guide the development of church-based interventions. METHOD A mixed methods approach was used. Quantitative methods included analyses of data on Pacific adolescents (sub-sample n=2495) from the cross-sectional survey (total sample n=4250) in South Auckland secondary schools. Comparisons were made between Pacific church attendees (77%) and non-attendees (23%) and ethnic groups (Samoa n=1107, Cook Island Maori n=557, Tongan n=592, Other Pacific n=239). Qualitative methods included analyses of data from Pacific church leaders (n=23) using semi-structured group interviews (n=4) and 1:1 interviews (n...
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