QSpace: Queen's Scholarship & Digital Collections

QSpace is an open access repository for scholarship and research produced at Queen's University. QSpace offers faculty, students, staff, and researchers a free and secure home to preserve and present their scholarship.

Recent Submissions

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    Evaluation of electromagnetic microsensors for integration in surgical navigation systems
    (2024-07-19) Cernelev, Pavel-Dumitru; Computing; Fichtinger, Gabor; Ungi, Tamas
    Breast cancer is a critical healthcare priority. It affects 1 in 8 women and account- ing for 13% of female cancer fatalities. The most frequent treatment, lumpectomy surgery, aims to remove all cancerous tissue while preserving healthy breast tissue. The outcomes of lumpectomy can be improved with navigation technology that guides surgeons during tumor removal. Similarly to how the GPS displays your current lo- cation and provides guidance to a destination, navigation technology can be used to display the same information to surgeons as to the location of how far their surgical tools are from the tumor. However, the tracking sensors used in these systems today can take up too much space in the operating area distracting surgeons from their work. The goal of this thesis is to find out if smaller sensors, including those that can be implanted inside the body, are effective for use in breast cancer surgeries. The principal contributions of this work are the evaluation of an implantable tracking sensor using open-source tools and the integration of smaller sensors in the existing surgical navigation system. The first contribution of this study was the validation of a newly developed sensor that can be implanted directly into tumors for tracking purposes. This sensor was tested to ensure it could accurately determine the position of objects during breast surgery. Although the results showed that the implantable sensor was accurate, it was found to be sensitive to external interference, making it impractical for actual use. To address this issue, the second contribution involved implementing a non- implantable sensor. This alternative sensor was able to perform accurately without the interference challenges faced by the implantable version. New attachments were designed to ensure compatibility with the existing navigation environment. When comparing the existing attachments to the new ones, it was found that the new at- tachment was roughly half the volume and one-forth the of the weight. Reducing the space and weight of surgical navigation systems helps address the problems caused by larger sensors and encourages the use of these systems. Future research will focus on investigating methods to reduce external interference on im- plantable sensors. The use of surgical navigation systems can improve a surgeon’s ability to perform breast cancer surgery and, ultimately, lead to better patient out- comes.
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    Who's Afraid of Asymmetric Federalism? - A Summary Discussion
    (Queen's University Institute of Intergovernmental Relations, 2005) Brown, Douglas
    The federal Liberal Party’s 2004 general election platform heavily emphasized issues that are mainly subject to provincial competence under the constitution (e.g. health care, child care, cities). Since the federal government lacks the authority to implement detailed regulatory schemes in these areas, acting on these election commitments frequently requires federal provincial-territorial (FPT) agreements. A controversial question that arises when considering all intergovernmental agreements is whether they should treat all provinces and territories similarly or whether the agreements should be expected to differ from one province/territory to another. This issue of symmetry or asymmetry arises at two levels. The first is whether all provinces should be and should be viewed as “equal” in legal and constitutional terms. The second relates to the political and administrative level and the intergovernmental agreements it generates. When should Canadians expect all provinces/territories to be treated similarly in these agreements and when should difference be the rule? Given this political context, it is timely to reconsider the factors that are relevant to the issue of symmetry and asymmetry. We are doing this by publishing a series of short commentaries over the first half of 2005. These papers will explore the different dimensions of this issue- the historical, the philosophical, the practical, the comparative (how other federations deal with asymmetrical pressures), and the empirical. We do this in the hope that the series will help improve the quality of public deliberation on this issue.
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    Improving decision-making and debate around Canada’s intergovernmental transfer system: The potential of an independent council
    (Queen's University Institute of Intergovernmental Relations, 2019-04) Hanniman, Kyle
    Intense controversy over Canada’s federal-provincial transfer system has returned. The latest round of conflict highlights a number of problems with the system, including the lack of adequate insurance against provincial revenue shocks. But more than anything, it highlights problems with national decision-making processes and debates. The federal government is free to change most aspects of the system unilaterally, but must – for the sake of national unity and its own electoral interests – take provincial views into account. Many provinces have been all too happy to supply these views, but in predictably self-serving ways that have left the feds (reluctant to raise regional tensions further) more or less silent. It is hard to fault this cautious approach given the various threats to national unity. But it has left the transfer system with a striking lack of vision and reform initiative. What, if anything, can we do to remedy this situation?
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    Housing, Natural Hazards and Flood Disaster Risk Reduction in Accra, Ghana
    (2024-07-19) Asiedu Kuffour, Oscar; Geography and Planning; Meligrana, John
    On March 18, 2015, the United Nations developed and approved the Sendai Framework for Disaster Risk Reduction (2015-2030). The Sendai Framework, which provided new modalities for achieving risk reduction in the next decade, contained targets and priorities for action to prevent new and reduce existing disaster risks. The scope and purpose of the framework was to guide multi hazard management of disaster risk which apply to all disasters that are caused by natural, man-made, technological and biological hazards. The expected outcome of the Framework is a substantial reduction of disaster risk and losses in lives and livelihoods of communities and countries. Ghana is a signatory to Sendai Framework (2015-2030) which was adopted by the UN General Assembly. One of the sectors of the economy that will challenge the realization of global disaster mitigation goals is housing, especially in the developing world. Inadequate housing supply, poor planning, limited housing alternatives and poor services means more people are living in slum conditions. This study presents the story of two peri urban communities in Accra, Ghana, in West Africa experiencing housing crisis and flooding in a delta area and striving to build resilience to flood hazards. I situate the thesis within the tradition of political ecology. By keeping with this tradition, I hang the thesis on Birkenholtz Network Political Ecology. Trevor Bikenholtz develops network political ecology from regional political ecology and scale theory due to the theory’s ability to examine human and non-human actors in hazard prone spaces. Its applicability in climate change and natural disaster reduction context also makes it more favourable for flood risk research. I apply Network Political Ecology in the flood situation of Tetegu and Glefe, two communities in peri urban Accra, Ghana, to analyze the struggles of both low-income urban dwellers and authorities. I use scholarly literatures, field observation and semi structured interviews with tenants, landlords, local artisans, municipal officers, and private estate developers to understand the ways poor people navigate life in flood prone areas. The research uncovers that private estate providers are seen by government to be right stakeholders that will build adequate housing and mitigate planning challenges in Accra but they do not have the capacity to fill the housing gap. The study provides an insight into the variety of ways in which poor people make decisions about their housing. It also provides voices to the marginalized as not irresponsible squatters who flout planning and building regulations. Rather, they are victims of non-working housing policy and planning environment.
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    Laboratory study on the behavior of a horizontal-ellipse culvert during service and ultimate load testing
    (American Society of Civil Engineers, 2016-11-11) Regier, Caleb; Hoult, Neil A.; Moore, Ian D.
    Horizontal-ellipse culverts have been used for many years as a substitute for more conventional short-span bridges; however, their performance has never been evaluated experimentally. This paper describes an experimental program to understand the behavior of a horizontal-ellipse culvert during backfilling, when subjected to simulated service loading at the ground surface, and during an ultimate limit states test. The backfill response of the specimen was similar to circular culverts except that, as expected, the specimen exhibited lower vertical stiffness than horizontal stiffness due to its shape. Contrary to current design conventions, the response of the culvert to surface loading was influenced by the cover depth. At 0.9 m of cover, the load-carrying mechanism was ring compression, whereas at 0.45 m, significant bending stresses developed in the top of the pipe. At 0.45 m of cover, the ultimate capacity of the culvert was measured as a tandem axle load of 1,324 kN. Although this is approximately twice the fully factored design load, the culvert failed after the development of a plastic hinge mechanism instead of the wall compression considered in American and Canadian design codes, although the structure still had reserve capacity.

Communities in QSpace

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  • Digital Collections
    This community includes digital collections produced by members of the Queen’s community, as well as digital special collections made available via W.D. Jordan Rare Books & Special Collections.
  • Exams & Syllabi
    This community provides access for staff and students at Queen’s University to degree examination papers and syllabi.
  • Graduate Theses, Dissertations and Projects
    This community includes graduate theses, dissertations and projects produced by students at Queen’s University.
  • Research Data
    This community includes research data produced by faculty and staff at Queen’s University.
  • Scholarly Contributions
    This community includes Queen’s peer-reviewed research publications, including journal articles, book chapters, conference proceedings, and more.