YorkSpace

YorkSpace is York University's Institutional Repository. It supports York University's Senate Policy on Open Access by providing York community members with a place to preserve their research online in an institutional context.

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Recent Submissions

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    Shared Ledgers, Fragmented Institutions: The Feasibility of Blockchain for Canadian Defence Supply Chains
    (2026-04-20) Tracey, Michael
    This paper examines the extent to which blockchain technology is feasible as a means of improving the security, transparency, and efficiency of defence supply chains in the Canadian context. It begins from the documented failures of Canada’s defence procurement and supply chain system, including fragmented accountability, poor organizational data sharing, persistent delivery delays, and growing concerns about supply chain integrity and cybersecurity. Drawing on peer-reviewed scholarship, public audit findings, parliamentary committee evidence, and government policy documents, the paper develops a four-part analytical framework to assess feasibility across technical, economic, institutional, and legal/security dimensions. Ultimately, it finds that blockchain adoption is conditionally feasible rather than ready for broad deployment. The technical foundations are sufficiently mature, and the Canadian context presents several independently verified pain points to which blockchain’s core functions are directly relevant. However, the strongest constraints are institutional, particularly the absence of a governance architecture capable of coordinating a multi-party ledger across Canada’s fragmented procurement environment. Economic feasibility is strongest in bounded, high-value workflows but remains uncertain at system-wide scale, especially where smaller supplier participation is required. The paper concludes that blockchain is most viable as targeted, controlled-access infrastructure for specific defence supply chain functions and not a comprehensive procurement solution.
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    A comprehensive survey of space robotic manipulators for on-orbit servicing
    (Frontiers Media, 2024-10-09) Alizadeh, Mohammad; Zhu, Zheng Hong
    On-Orbit Servicing (OOS) robots are transforming space exploration by enabling vital maintenance and repair of spacecraft directly in space. However, achieving precise and safe manipulation in microgravity necessitates overcoming significant challenges. This survey delves into four crucial areas essential for successful OOS manipulation: object state estimation, motion planning, and feedback control. Techniques from traditional vision to advanced X-ray and neural network methods are explored for object state estimation. Strategies for fuel-optimized trajectories, docking maneuvers, and collision avoidance are examined in motion planning. The survey also explores control methods for various scenarios, including cooperative manipulation and handling uncertainties, in feedback control. Additionally, this survey examines how Machine learning techniques can further propel OOS robots towards more complex and delicate tasks in space.
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    Unlocking Lewis acidity via the redox non-innocence of a phenothiazine-substituted borane
    (Royal Society of Chemistry, 2024-04-01) Cosby, Taylor P. L.; Bhattacharjee, Avik; Henneberry, Samantha K.; LeBlanc, Jesse; Caputo, Christopher
    We describe a new approach to enhancing Lewis acidity, through the single electron oxidation of a borane with a pendant phenothiazine. This results in the formation of a persistent radical cation with increased electrophilicity. Computational and experimental studies indicate this radical cation significantly enhances the Lewis acidity and catalytic activity compared to its neutral analog. These results illustrate the viability of this approach in turning on the Lewis acidity of relatively inert boranes.
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    Anachronic: Viral Socialities and Project Time among HIV Support Groups in Barbados
    (Wiley, 2022-03-09) Murray, David AB
    From 2005 to 2015, up to five support groups for people living with HIV (PLHIV) operated in Barbados. However, by early 2020, all but one had disappeared. What caused the demise of these groups and why? What does this demise tell us about the HIV response in Barbados, and more particularly, everyday life for PLHIV? More generally, what does it tell us about "viral socialities" (ties formed between groups of people as they confront the lived effects of infection and discrimination attributable to HIV) and the effects of "project time" (a time frame delimited through the priorities of global HIV/AIDS agencies) on these socialities? Through ethnographic and archival research methods, this article reveals how multiple, unstable project times create and transform viral socialities of Barbadian PLHIV with anachronic effects for some-i.e., a sense of alienation or being "out of time" in relation to the priorities of the global HIV response.
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    Queerly departed: Queer viral socialities and Caribbean migrant desires
    (SAGE Publications, 2023-04-11) Murray, David AB
    In this paper I explore the transnational journeys of a group of queer HIV positive (HIV+) Caribbean migrants moving between Canada and the Caribbean. I focus on queer orientations and viral statuses as key nodes of subjectivity and/or sociality that may combine in different ways to produce (re)orientations (qua Ahmed 2006) and new social relationships-queer viral socialities-that generate migratory desires and journeys across transnational borders. However, queer HIV+ migrants from Global South locations like the Caribbean often encounter difficulties crossing Global North borders designed to facilitate entry for select categories of acceptable migrants. Acknowledging the productive yet unpredictable interactions of queer viral orientations and socialities that generate migratory desires and journeys alongside the harsh surveillance and disciplinary actions of nation-states' border security regimes draws attention to the intersectionality and complexity of subjectivities, socialities, desires, and movements of queer HIV+ Caribbean migrants specifically, and transnational migrants more generally as they navigate the barriers and inequities of state migration apparatuses.