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6 results on '"Boersema P"'

1. Real $K$-Theory for $C^*$-Algebras: Just the Facts

Author

Boersema, Jeff and Schochet, Claude

Subjects
Mathematics - Operator Algebras, Mathematics - K-Theory and Homology, 46L80 (Primary) 14K99, 46M20 (Secondary)
Abstract

This paper is intended to present the basic properties of $KO$-theory for real $C^*$-algebras and to explain its relationship with complex $K$-theory and with $KR$- theory. Whenever possible we will rely upon proofs in printed literature, particularly the work of Karoubi, Wood, Schr\"oder, and more recent work of Boersema and J. M. Rosenberg. In addition, we shall explain how $KO$-theory is related to the Ten-Fold Way in physics and point out how some deeper features of $KO$-theory for operator algebras may provide powerful new tools there. Commutative real $C^*$-algebras NOT of the form $C^R(X)$ will play a special role. We also will identify Atiyah's $KR^0(X, \tau ))$ in terms of $KO_0$ of an associated real $C^*$-algebra., Comment: 76 pages. We welcome and greatly appreciate comments, criticism, corrections, suggestions. Submitted to L'Enseign. Math. After it is published it will be found at https://ems.press.journals/lem

Published
2024

2. Real and complex K-theory for higher rank graph algebras arising from cube complexes

Author

Boersema, Jeffrey L and Vdovina, Alina

Subjects
Mathematics - Operator Algebras, 46L80 (Primary), 19K99, 20E08 (Secondary)
Abstract

Using the Evans spectral sequence and its counter-part for real $K$-theory, we compute both the real and complex $K$-theory of several infinite families of $C^*$-algebras based on higher-rank graphs of rank $3$ and $4$. The higher-rank graphs we consider arise from double-covers of cube complexes. By considering the real and complex $K$-theory together, we are able to carry these computations much further than might be possible considering complex $K$-theory alone. As these algebras are classified by $K$-theory, we are able to characterize the isomorphism classes of the graph algebras in terms of the combinatorial and number-theoretic properties of the construction ingredients.

Published
2024

4. Ideal Clinic Realisation and Maintenance programme implementation in rural KwaZulu-Natal

Author

Donald T. Mhlungu, Geertien C. Boersema, and Mokholelana M. Ramukumba

Subjects
ideal clinic realisation and maintenance programme, ideal clinic, implementation, kwazulu-natal, primary healthcare, professional nurse, rural., Medicine, Public aspects of medicine, RA1-1270
Abstract

Background: The delivery of quality primary healthcare (PHC) services is vital for enhancing the health status of rural communities, yet persistent barriers exist in resource-constrained rural settings. Aim: The study explored perspectives on the barriers to and facilitators of implementing the Ideal Clinic Realisation and Maintenance (ICRM) programme as a quality assurance initiative in a rural KwaZulu-Natal subdistrict. Setting: Professional nurses and healthcare managers from seven PHC clinics in a rural subdistrict of KwaZulu-Natal and supervising managers from a district hospital participated in this study. Methods: Telephonic semi-structured interviews were conducted using a qualitative case study approach with the purposively selected sample. Data were inductively and thematically analysed. Results: Themes included ICRM programme organisation, barriers and facilitators for implementing the ICRM programme. Barriers in rural PHC settings included overburdened clinics, suboptimal infrastructure, staff burnout, poor communication and non-adherence to clinical guidelines. Despite obstacles, programme implementation was facilitated through stakeholder support and teamwork. Participants emphasised the need for infrastructure upgrades, more human and physical resources, and maintenance of stakeholder support. Conclusion: If challenges are mitigated and supportive factors are leveraged, the potential for successful programme implementation and improved healthcare delivery can benefit both healthcare providers and recipients. Contribution: Through providing insight into the perspectives of both implementers and supervisors, the study informs stakeholders and policymakers about difficulties encountered and potential improvements to be made in the implementation of the ICRM programme in rural PHC.

Published
2024
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5. Contextualising knowledge translation in nursing homes: A transdisciplinary online workshop

Author

Geertien C. Boersema, Gisela H. van Rensburg, and Benjamin S. Botha

Subjects
data collection method, knowledge translation, nursing homes, participatory design, south africa, transdisciplinary, workshop, wound care., Science, Social Sciences
Abstract

Few studies describe workshops as a method for obtaining and integrating diverse participant perspectives for contextualisation. This article describes an online workshop as a transdisciplinary data collection method for contextualising theoretical elements of a framework for knowledge translation to improve wound care in South African nursing homes. Knowledge translation can be more effective when the theoretical components are contextualised and aligned with the specific needs in the context. The online workshop was conducted with 10 participants involved with wound care and change processes in nursing homes across South Africa. The participants consisted of healthcare professionals, family members of those in care and nursing home management staff. Participatory design principles were applied during the online workshop, which was hosted on BlackBoard CollaborateTM Ultra. In this qualitative study, live polls, facilitated discussion, virtual whiteboard posts, and breakaway activities were used to collect the data. The data were analysed and integrated using both deductive and inductive processes for a comprehensive understanding. The workshop enabled the researchers to ascertain integrated perspectives to contextualise the knowledge translation framework’s elements. Barriers to evidence-based wound care in nursing homes and nine values for dignified care for older persons were identified. Transdisciplinary contribution: This article shows how an online workshop was conducted with a group of participants from various healthcare disciplines, family members and institutional management to achieve a contextualised and pragmatic description of theoretical elements. Contextualisation aims to enhance the effectiveness of a knowledge translation framework for use in nursing homes.

Published
2024
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6. Cost Analysis of Implementing a 12-Month Recertification Criterion for Ryan White HIV/AIDS Program’s AIDS Drug Assistance Program in Washington State

Author

Erly, Steven, Dombrowski, Julia C., Khosropour, Christine, Reuer, Jennifer R., Boersema, Kandis, and Sharma, Monisha

Abstract

Objective: AIDS Drug Assistance Programs (ADAPs) are state-administered programs that pay for medical care and medication for people living with HIV (PLWH) in the United States. In October 2021, the federal policy requiring that clients recertify for the program every 6 months was repealed, giving states the authority to set their own recertification policies. However, little data exist on the costs and health effects of alternative recertification schedules. We assessed the cost of changing the legacy 6-month recertification to a 12-month schedule in Washington State to inform policy decisions on recertification.Methods: We used a Markov model to simulate the population of PLWH in Washington State who are eligible or enrolled in ADAP. We obtained model inputs and validation data from the Washington State Ryan White database. We estimated the cost of 12-month and 6-month criteria over a 5-year time horizon. Model outputs included annual program costs, population sizes, and number of people virally suppressed, by scenario.Results: Under a continuation of the legacy 6-month recertification criteria, the annual cost of Washington ADAP would be $37 663 000 (95% CI, $34 570 000-$41 686 000) during the next 5 years, with a per-client cost of $7966 (95% CI, $7478-$8494). Under 12-month criteria, the annual cost would be $40 217 000 (95% CI, $36 243 000-$44 401 000) and the per-client cost would be $7543 (95% CI, $7084-$8042). Under the 12-month scenario, 245 more people will have been virally suppressed by the end of 2025.Conclusions: Switching to a less frequent recertification process may improve health outcomes at a modest increase in cost in Washington State.

Published
2024
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