Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 739
Filtrar
Más filtros

Intervalo de año de publicación
1.
Proc Natl Acad Sci U S A ; 120(5): e2214353120, 2023 Jan 31.
Artículo en Inglés | MEDLINE | ID: mdl-36689662

RESUMEN

Rubble piles asteroids consist of reassembled fragments from shattered monolithic asteroids and are much more abundant than previously thought in the solar system. Although monolithic asteroids that are a kilometer in diameter have been predicted to have a lifespan of few 100 million years, it is currently not known how durable rubble pile asteroids are. Here, we show that rubble pile asteroids can survive ambient solar system bombardment processes for extremely long periods and potentially 10 times longer than their monolith counterparts. We studied three regolith dust particles recovered by the Hayabusa space probe from the rubble pile asteroid 25143 Itokawa using electron backscatter diffraction, time-of-flight secondary ion mass spectrometry, atom probe tomography, and 40Ar/39Ar dating techniques. Our results show that the particles have only been affected by shock pressure of ca. 5 to 15 GPa. Two particles have 40Ar/39Ar ages of 4,219 ± 35 and 4,149 ± 41 My and when combined with thermal and diffusion models; these results constrain the formation age of the rubble pile structure to ≥4.2 billion years ago. Such a long survival time for an asteroid is attributed to the shock-absorbent nature of rubble pile material and suggests that rubble piles are hard to destroy once they are created. Our results suggest that rubble piles are probably more abundant in the asteroid belt than previously thought and provide constrain to help develop mitigation strategies to prevent asteroid collisions with Earth.


Asunto(s)
Polvo , Planeta Tierra , Difusión , Electrones , Longevidad
2.
Proc Natl Acad Sci U S A ; 119(51): e2214395119, 2022 12 20.
Artículo en Inglés | MEDLINE | ID: mdl-36508675

RESUMEN

Remote sensing data revealed that the presence of water (OH/H2O) on the Moon is latitude-dependent and probably time-of-day variation, suggesting a solar wind (SW)-originated water with a high degassing loss rate on the lunar surface. However, it is unknown whether or not the SW-derived water in lunar soil grains can be preserved beneath the surface. We report ion microprobe analyses of hydrogen abundances, and deuterium/hydrogen ratios of the lunar soil grains returned by the Chang'e-5 mission from a higher latitude than previous missions. Most of the grain rims (topmost ~100 nm) show high abundances of hydrogen (1,116 to 2,516 ppm) with extremely low δD values (-908 to -992‰), implying nearly exclusively a SW origin. The hydrogen-content depth distribution in the grain rims is phase-dependent, either bell-shaped for glass or monotonic decrease for mineral grains. This reveals the dynamic equilibrium between implantation and outgassing of SW-hydrogen in soil grains on the lunar surface. Heating experiments on a subset of the grains further demonstrate that the SW-implanted hydrogen could be preserved after burial. By comparing with the Apollo data, both observations and simulations provide constraints on the governing role of temperature (latitude) on hydrogen implantation/migration in lunar soils. We predict an even higher abundance of hydrogen in the grain rims in the lunar polar regions (average ~9,500 ppm), which corresponds to an estimation of the bulk water content of ~560 ppm in the polar soils assuming the same grain size distribution as Apollo soils, consistent with the orbit remote sensing result.


Asunto(s)
Suelo , Agua , Luna , Viento , Hidrógeno
3.
J Gen Intern Med ; 39(12): 2233-2240, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-38724741

RESUMEN

BACKGROUND: The Maintaining Internal Systems and Strengthening Integrated Outside Networks (MISSION) Act of 2018 authorized a major expansion of purchased care in the community for Veterans experiencing access barriers in the Veterans Affairs (VA) health care system. OBJECTIVE: To estimate changes in primary care, mental health, and emergency/urgent care visits in the VA and community fiscal years (FY) 2018-2021 and differences between rural and urban clinics. DESIGN: A national, longitudinal study of VA clinics and outpatient utilization. Clinic-level analysis was conducted to estimate changes in number and proportion of clinic visits provided in the community associated with the MISSION Act adjusting for clinic characteristics and underlying time trends. PARTICIPANTS: In total, 1050 VA clinics and 6.6 million Veterans assigned to primary care. MAIN MEASURES: Number of primary care, mental health, and emergency/urgent care visits provided in the VA and community and the proportion provided in the community. KEY RESULTS: Nationally, community primary care visits increased by 107% (50,611 to 104,923), community mental health visits increased by 167% (100,701 to 268,976), and community emergency/urgent care visits increased by 129% (142,262 to 325,407) from the first quarter of 2018 to last quarter of 2021. In adjusted analysis, after MISSION Act implementation, there was an increase in community visits as a proportion of total clinic visits for emergency/urgent care and mental health but not primary care. Rural clinics had larger increases in the proportion of community visits for primary care and emergency/urgent care than urban clinics. CONCLUSIONS: After the MISSION Act, more outpatient care shifted to the community for emergency/urgent care and mental health care but not primary care. Community care utilization increased more in rural compared to urban clinics for primary care and emergency/urgent care. These findings highlight the challenges and importance of maintaining provider networks in rural areas to ensure access to care.


Asunto(s)
Atención Ambulatoria , Atención Primaria de Salud , United States Department of Veterans Affairs , Veteranos , Humanos , Estados Unidos , Atención Ambulatoria/estadística & datos numéricos , Estudios Longitudinales , Masculino , Femenino , Persona de Mediana Edad , Accesibilidad a los Servicios de Salud , Anciano , Servicios de Salud Comunitaria
4.
Diabet Med ; 41(9): e15350, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-38785432

RESUMEN

AIMS: NHS England commissioned independent service providers to deliver the NHS Low-Calorie Diet Programme pilot. Previous research has illustrated a drift in the fidelity of behaviour change techniques (BCTs) during the delivery of the programme provided through face-to-face group or one-to-one behavioural support. The aim of this study was to assess the delivery fidelity of the BCT content in the digital delivery of the programme. METHODS: Online, app chat and phone call support content was coded using The Behaviour Change Technique Taxonomy. BCTs delivered by each service provider (N = 2) were calculated and compared to the BCTs specified in the NHS service specification and those specified in the providers' programme plans. RESULTS: Between 78% and 83% of the BCTs identified in the NHS service specification were delivered by the service providers. The fidelity of BCT delivery to those specified in providers' programme plans was 60%-65% for provider A, and 82% for provider B. CONCLUSIONS: The BCT content of the digital model used in the NHS-LCD programme adhered well to the NHS service specification and providers' plans. It surpassed what has been previously observed in face-to-face services provided through group or one-on-one behavioural support models.


Asunto(s)
Terapia Conductista , Medicina Estatal , Humanos , Terapia Conductista/métodos , Restricción Calórica/métodos , Inglaterra , Diabetes Mellitus Tipo 2 , Aplicaciones Móviles , Proyectos Piloto
5.
J Surg Res ; 302: 662-668, 2024 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-39208491

RESUMEN

INTRODUCTION: Resident interest in global surgery has increased over recent years. Incorporating short-term surgical missions (STSMs) into training improves Accreditation Council for Graduate Medical Education (ACGME) competencies and aids in understanding of global health infrastructure. We aim to investigate the impact of STSM participation during residency on the desire for participation after residency, and barriers in doing so. METHODS: Eighteen general surgery residents who participated in STSM with the International Surgical Health Initiative from 2009 to 2017 were surveyed. An 18-question survey encompassing demographics, mission-specific data, ACGME competencies, current perspectives, barriers, and areas for improvement was distributed. RESULTS: The group averaged 5.4 y out of residency and 89% (n = 16) completed the survey. Mean age was 38.5 y with a female predominance (62.5%). During residency, 10 (62.5%) participated in ≥ two STSMs and six (37.5%) participated in one STSM. On average, each resident performed 24 cases per mission. All reported that after their resident STSM experience, they were more inclined to participate as an attending. Twenty-five percent (n = 4) participated in STSMs after residency. Vacation, scheduling, and family factors were ranked the highest barriers. All ACGME competencies were felt to be significantly improved by STSMs. CONCLUSIONS: This is the first long-term follow-up study of general surgery residents who participated in STSMs confirming that resident involvement increases desire for continued participation. Although 100% of residents wanted to participate as attendings, only 25% were successful in doing so. While operative experience is salient in surgical residency, there are other valuable experiences to be gained. Further work should focus on enhancing experiences and mitigation of barriers to continued participation in global humanitarian initiatives.


Asunto(s)
Cirugía General , Internado y Residencia , Misiones Médicas , Humanos , Femenino , Misiones Médicas/organización & administración , Misiones Médicas/estadística & datos numéricos , Internado y Residencia/estadística & datos numéricos , Internado y Residencia/organización & administración , Masculino , Adulto , Cirugía General/educación , Estudios de Seguimiento , Encuestas y Cuestionarios/estadística & datos numéricos , Salud Global , Competencia Clínica/estadística & datos numéricos , Educación de Postgrado en Medicina
6.
Value Health ; 27(6): 713-720, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38462222

RESUMEN

OBJECTIVES: To improve access, the VA Maintaining Internal Systems and Strengthening Integrated Outside Networks (MISSION) Act of 2018 mandated a 2-year study of medical scribes in Veterans Health Administration specialty clinics and emergency departments. Medical scribes are employed in clinical settings with the goals of increasing provider productivity and satisfaction by minimizing physicians' documentation burden. Our objective is to quantify the economic outcomes of the MISSION Act scribes trial. METHODS: A cluster-randomized trial was designed with 12 Department of Veterans Affairs (VA) medical centers randomized into the intervention. We estimated the total cost of the trial, cost per scribe-year, and projected cost of hiring additional physicians to achieve the observed scribe productivity benefits in relative value units and visits per full-time-equivalent over the 2-year intervention period (June 30, 2020 to July 1, 2022). RESULTS: The estimated cost of the trial was $4.6 million, below the Congressional Budget Office estimate of $5 million. A full-time scribe-year cost approximately $74 600 through contracting and $62 900 through VA hiring. Randomization into the trial led to an approximate 30% increase in productivity in cardiology and 20% in orthopedics. The projected incremental cost of using additional physicians instead of scribes to achieve the same productivity benefits was nearly $1.7 million more, or 75% higher, than the observed cost of scribes in cardiology and orthopedics. CONCLUSIONS: As the largest randomized trial of scribes to date, the MISSION Act scribes trial provides important evidence on the costs and benefits of scribes. Improving productivity enhances access and scribes may give VA a new tool to improve productivity in specialty care at a lower cost than hiring additional providers.


Asunto(s)
Eficiencia Organizacional , United States Department of Veterans Affairs , Estados Unidos , Humanos , Documentación/economía , Análisis Costo-Beneficio , Eficiencia , Hospitales de Veteranos/economía , Prestación Integrada de Atención de Salud/economía , Prestación Integrada de Atención de Salud/organización & administración
7.
Ann Fam Med ; 22(3): 237-243, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38806264

RESUMEN

Academic practices and departments are defined by a tripartite mission of care, education, and research, conceived as being mutually reinforcing. But in practice, academic faculty have often experienced these 3 missions as competing rather than complementary priorities. This siloed approach has interfered with innovation as a learning health system in which the tripartite missions reinforce each other in practical ways. This paper presents a longitudinal case example of harmonizing academic missions in a large family medicine department so that missions and people interact in mutually beneficial ways to create value for patients, learners, and faculty. We describe specific experiences, implementation, and examples of harmonizing missions as a feasible strategy and culture. "Harmonized" means that no one mission subordinates or drives out the others; each mission informs and strengthens the others (quickly in practice) while faculty experience the triparate mission as a coherent whole faculty job. Because an academic department is a complex system of work and relationships, concepts for leading a complex adaptive system were employed: (1) a "good enough" vision, (2) frequent and productive interactions, and (3) a few simple rules. These helped people harmonize their work without telling them exactly what to do, when, and how. Our goal here is to highlight concrete examples of harmonizing missions as a feasible operating method, suggesting ways it builds a foundation for a learning health system and potentially improving faculty well-being.


Asunto(s)
Docentes Médicos , Medicina Familiar y Comunitaria , Medicina Familiar y Comunitaria/educación , Humanos , Estudios Longitudinales , Centros Médicos Académicos/organización & administración , Estudios de Casos Organizacionales , Objetivos Organizacionales
8.
Pediatr Nephrol ; 2024 Sep 03.
Artículo en Inglés | MEDLINE | ID: mdl-39225811

RESUMEN

BACKGROUND: The Guatemalan Foundation for Children with Kidney Diseases collaborated with Bridge of Life, a not-for-profit charitable organization, to establish a vascular access program. We reviewed our experience with graded surgical responsibility and structured didactic training, creating arteriovenous fistulas (AVF) for Guatemalan children. METHODS: Pediatric vascular access missions were completed from 2015 to 2023 and analyzed retrospectively. Follow-up was completed by the Guatemalan pediatric surgeons, nephrologists, and nursing staff. AVF patency and patient survival were evaluated by Kaplan-Meier life-table analysis with univariate and multivariable association between patient demographic variables by Cox proportional hazards models. RESULTS: Among a total of 153 vascular access operations, there were 139 new patient procedures, forming the study group for this review. The mean age was 13.6 years, 42.6% were female, and the mean BMI was 17.3. Radial or ulnar artery-based direct AVFs were established in 100 patients (71.9%) and ten of the 25 transposition procedures. Brachial artery inflow was required in 29 direct AVFs (20.9%). Two patients underwent femoral vein transpositions. Access-related distal ischemia was not encountered. Seven of the AVF patients later required access banding for arm edema; all had previous dialysis catheters (mean = 9, range 4-12). Primary and cumulative patency rates were 84% and 86% at 12 months and 64% and 81% at 24 months, respectively. The median follow-up was 12 months. Overall patient survival was 84% and 67% at 12 and 24 months, respectively. There were no deaths related to AVF access. CONCLUSIONS: Safe and functional AVFs were established in a teaching environment within a Guatemalan comprehensive pediatric nephrology center.

9.
Environ Res ; 248: 118319, 2024 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-38295975

RESUMEN

New policy developments have emerged in relation to soil conservation after 2020. The Common Agricultural Policy (CAP) 2023-2027, the proposal for a Soil Monitoring Law and the mission 'A Soil Deal for Europe' have shaped a new policy framework at EU level, which requires updated assessments on soil erosion and land degradation. The EU Soil Observatory (EUSO) successfully organised a scientific workshop on 'Soil erosion for the EU' in June 2022. The event has seen the participation of more than 330 people from 63 countries, addressing important topics such as (i) management practices, (ii) large scale modelling, (iii) the importance of sediments in nutrient cycle, (vi) the role of landslides and (v) laying the foundations for early career scientists. As a follow up, among the 120 abstracts submitted in the workshop, we received fifteen manuscripts, out of which nine were selected for publication in the present special issue. In this editorial, we summarize the major challenges that the soil erosion research community faces in relation to supporting the increasing role of soils in the EU Green Deal.


Asunto(s)
Erosión del Suelo , Suelo , Humanos , Agricultura , Europa (Continente) , Formulación de Políticas , Conservación de los Recursos Naturales
10.
Global Health ; 20(1): 26, 2024 Mar 26.
Artículo en Inglés | MEDLINE | ID: mdl-38532478

RESUMEN

BACKGROUND: Antimicrobial resistance (AMR) causes high levels of global mortality. There is a global need to develop new antimicrobials to replace those whose efficacy is being eroded, but limited incentive for companies to engage in R&D, and a limited pipeline of new drugs. There is a recognised need for policies in the form of 'push' and 'pull' incentives to support this R&D. This article discusses China, a country with a rapidly emerging pharmaceuticals and biotech (P&B) sector, and a history of using coordinated innovation and industrial policy for strategic and developmental ends. We investigate the extent to which 'government guidance funds' (GGFs), strategic industrial financing vehicles (a 'push' mechanism), support the development of antimicrobials as part of China's 'mission-driven' approach to innovation and industrial policy. GGFs are potentially globally significant, having raised approximately US$ 872 billion to 2020. RESULTS: GGFs have a substantial role in P&B, but almost no role in developing new antimicrobials, despite this being a priority in the country's AMR National Action Plan. There are multiple constraints on GGFs' ability to function as part of a mission-driven approach to innovation at present, linked to their business model and the absence of standard markets for antimicrobials (or other effective 'pull' mechanisms), their unclear 'social' mandate, and limited technical capacity. However, GGFs are highly responsive to changing policy demands and can be used strategically by government in response to changing needs. CONCLUSIONS: Despite the very limited role of GGFs in developing new antimicrobials, their responsiveness to policy means they are likely to play a larger role as P&B becomes an increasingly important component of China's innovation and industrial strategy. However, for GGFs to effectively play that role, there is a need for reforms to their governance model, an increase in technical and managerial capacity, and supporting ('pull') incentives, particularly for pharmaceuticals such as antimicrobials for which there is strong social need, but a limited market. Given GGFs' scale and strategic importance, they deserve further research as China's P&B sector becomes increasingly globally important, and as the Chinese government commits to a larger role in global health.


Asunto(s)
Antibacterianos , Antiinfecciosos , Humanos , Farmacorresistencia Bacteriana , Industrias , Preparaciones Farmacéuticas , China
11.
BMC Public Health ; 24(1): 997, 2024 Apr 12.
Artículo en Inglés | MEDLINE | ID: mdl-38609876

RESUMEN

BACKGROUND: The Indian Swachh Bharat Mission (SBM) was launched in 2014 with the goal to make India open defecation (OD) free by October 2019. Although it is known that the ambitious goal was not achieved, the nature of the sanitation change brought about by the SBM in different parts of India is poorly understood. One reason is a dearth of case studies that would shed light on the performance of the SBM simultaneously across its different domains. This article provides an example of such study. Employing a Process, Outcomes, Context approach, the objective is to understand the process and outcomes of the SBM-induced sanitation change in a specific context of rural Jharkhand. METHODS: The study utilizes data collected through field research conducted in the rural areas of Ranchi district, Jharkhand, a state in east-central India. This data was obtained via repeated cross-sectional household surveys conducted at the beginning and at the end of the SBM, supplemented by key informant interviews with SBM stakeholders. FINDINGS: We identified political support of SBM implementation and its acceptance amongst the population. Female community workers became key agents of SBM implementation at local level. The SBM increased toilet coverage in the study area from 15% to 85% and lowered the OD rate from 93% to 26%. It substantially reduced structural inequalities in access to toilets, furthered social sanitation norms, improved some of the attitudes towards toilet use, but impacted less on hygiene and sanitation knowledge. The implementation mainly concentrated on the construction of subsidized toilets but less on improving public understanding of safe sanitation practices. CONCLUSIONS: Although the SBM reduced sanitation inequalities in access to toilets in the study area, the behaviour change component was underplayed, focusing more on spreading normative sanitation messages and less on public education. Sustainability of the observed sanitation change remains a key question for the future. This article calls for more systematic production of geographically situated knowledge on the performance of sanitation interventions.


Asunto(s)
Pueblo Asiatico , Saneamiento , Humanos , Femenino , Estudios Transversales , Aspiraciones Psicológicas , India
12.
BMC Public Health ; 24(1): 152, 2024 01 11.
Artículo en Inglés | MEDLINE | ID: mdl-38200463

RESUMEN

BACKGROUND: Health and wellbeing can be profoundly impacted by both obesity and type 2 diabetes, while the normalisation and equity of care for people living with these non-communicable diseases remain as challenges for local health systems. The National Health Service Low Calorie Diet programme in England, aims to support people to achieve type 2 diabetes remission, while also reducing health inequalities. We have explored the experiences of health care staff who have made a referral to the LCD programme, while identifying effective and equitable delivery of programme referrals, and their normalisation into routine care. METHODS: Nineteen individual semi-structured interviews were completed health care staff in the first year of the Low Calorie Diet programme. Interviewees were purposively sampled from the ten localities who undertook the Low Calorie Diet programme pilot. Each interview explored a number of topics of interest including communication and training, referrals, equity, and demands on primary care, before being subjected to a thematic analysis. RESULTS: From the data, five core themes were identified: Covid-19 and the demands on primary care, the expertise and knowledge of referrers, patient identification and the referral process, barriers to referrals and who gets referred to the NHS LCD programme. Our findings demonstrate the variation in the real world settings of a national diabetes programme. It highlights the challenge of COVID-19 for health care staff, whereby the increased workload of referrals occurred at a time when capacity was curtailed. We have also identified several barriers to referral and have shown that referrals had not yet been normalised into routine care at the point of data collection. We also raise issues of equity in the referral process, as not all eligible people are informed about the programme. CONCLUSIONS: Referral generation had not yet been consistently normalised into routine care, yet our findings suggest that the LCD programme runs the risk of normalising an inequitable referral process. Inequalities remain a significant challenge, and the adoption of an equitable referral process, normalised at a service delivery level, has the capacity to contribute to the improvement of health inequalities.


Asunto(s)
COVID-19 , Diabetes Mellitus Tipo 2 , Humanos , Restricción Calórica , Diabetes Mellitus Tipo 2/terapia , Medicina Estatal , Derivación y Consulta
13.
BMC Health Serv Res ; 24(1): 53, 2024 Jan 10.
Artículo en Inglés | MEDLINE | ID: mdl-38200539

RESUMEN

BACKGROUND: The National Health Service Type 2 Diabetes Path to Remission programme in England (known as the NHS Low Calorie Diet programme when piloted) was established to support people living with excess weight and Type 2 Diabetes to lose weight and improve their glycaemic control. A mixed method evaluation was commissioned to provide an enhanced understanding of the long-term cost effectiveness of the pilot programme, its implementation, equity and transferability across broad and diverse populations. This study provided key insights on implementation and equity from the service providers' perspective. METHODS: Thirteen focus groups were conducted with commercial providers of the programme, during the initial pilot rollout. Participants were purposively sampled across all provider organisations and staff roles involved in implementing and delivering the programme. Normalisation Process Theory (NPT) was used to design the topic schedule, with the addition of topics on equity and person-centredness. Data were thematically analysed using NPT constructs with additional inductively created codes. Codes were summarised, and analytical themes generated. RESULTS: The programme was found to fulfil the requirements for normalisation from the providers' perspective. However, barriers were identified in engaging GP practices and receiving sufficient referrals, as well as supporting service users through challenges to remain compliant. There was variation in communication and training between provider sites. Areas for learning and improvement included adapting systems and processes and closing the gap where needs of service users are not fully met. CONCLUSIONS: The evaluation of the pilot programme demonstrated that it was workable when supported by effective primary care engagement, comprehensive training, and effective internal and external communication. However, limitations were identified in relation to programme specifications e.g. eligibility criteria, service specification and local commissioning decisions e.g. pattern of roll out, incentivisation of general practice. A person-centred approach to care is fundamental and should include cultural adaptation(s), and the assessment and signposting to additional support and services where required.


Asunto(s)
Restricción Calórica , Diabetes Mellitus Tipo 2 , Humanos , Diabetes Mellitus Tipo 2/terapia , Medicina Estatal , Comunicación , Determinación de la Elegibilidad
14.
Risk Anal ; 44(3): 666-685, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-37365868

RESUMEN

Information-driven mission abort is an effective way to control the failure risk of safety-critical systems during mission executions. We investigate the optimal sampling and mission abort decisions of partially observable safety-critical systems, where the underlying system health state can only be revealed by sampling. In contrast to previous studies, we employ partial health information to jointly determine: (a) whether to execute sampling, and (b) when to abort the mission in a dynamic manner, so as to minimize the expected total cost incurred by sampling, mission failure, and system malfunction. Dynamic sampling and mission abort policies are devised following the belief state, whose optimization model is cast into the framework of a partially observable Markov decision process. Some structural insights with regard to the value function, control limit selection, and optimality existence are presented. The performance of the proposed sampling and abort policy is tested by numerical experiments, which are proved to outperform other heuristic abort policies in mission loss control.

15.
Risk Anal ; 2024 Aug 07.
Artículo en Inglés | MEDLINE | ID: mdl-39108177

RESUMEN

The failure behavior of safety-critical systems typically depends on the system performance level, which offers opportunities to control system failure risk through dynamic performance adjustment. Moreover, mission abort serves as an intuitive way to mitigate safety hazards during mission execution. Our study focuses on systems that execute successive missions with random durations. To balance mission completion probability and system failure risk, we examine two decision problems: when to abort missions and how to select the performance level prior to mission abort. Our objective is to maximize the expected revenue through dynamic performance control and mission abort (PCMA) decisions. We consider condition-based PCMA decisions and formulate the joint optimization problem into a Markov decision process. We establish the monotonicity and concavity of the value function. Based on this insight, we show that optimizing the mission abort policy requires a series of control limits. In addition, we provide conditions under which the performance control policies are monotone. For comparative purposes, we analytically evaluate the performances of some heuristic policies. Finally, we present a case study involving unmanned aerial vehicles executing power line inspections. The results indicate the superiority of our proposed risk control policies in enhancing operational performance for safety-critical systems. Dynamic performance adjustment and mission abort decisions provide opportunities to reduce the failure risk and increase operational rewards of safety-critical systems.

16.
Health Res Policy Syst ; 22(1): 69, 2024 Jun 13.
Artículo en Inglés | MEDLINE | ID: mdl-38872202

RESUMEN

BACKGROUND: Facing global grand challenges such as coronavirus disease 2019 (COVID-19) require the participation of various actors in different sectors and systematically directing their innovative efforts. Considering the complexity, non-linear dynamics, and global extent of the COVID-19 challenge, developing and applying a multi-level, resilient, and systematic innovative framework is vital. Therefore, this study aims to apply the "innovation biosphere" framework inspired by ecological studies for examining and analysing the management dimensions of COVID-19. METHODS: In this research, based on a deductive-inductive approach, the case study methodology is used. In accordance with this strategy, the innovation biosphere metaphor is considered as the basic framework (deductive approach) and subsequently the grand challenge of COVID-19 (inductive approach) is analysed at three levels: micro, meso and macro. RESULTS: The research findings verify the correspondence between what happened in the management of COVID-19 and the proposed framework of innovation biosphere. In other words, the findings of the research show that the effect of global cooperation, role-playing and co-evolution of different actors and subsystems in facing the grand challenge of COVID-19 under an ecosystemic and eco-innovation approach has been evident. These events subsequently led to the cessation of the pandemic after about four years. CONCLUSIONS: The main policy implications include the role of self-organization, the capability of global value networks, mission orientation, and co-evolution between actors as the contributions of innovation biosphere framework for managing grand health challenges, and global cohesion, oligopoly market, supporting local innovations, the critical role of basic research, and deregulation as the contributions of the COVID-19 case study for enhancing the innovation biosphere metaphor.


Asunto(s)
COVID-19 , SARS-CoV-2 , COVID-19/epidemiología , Humanos , Política de Salud , Pandemias , Invenciones , Salud Global , Cooperación Internacional
17.
Med Teach ; : 1-9, 2024 Feb 23.
Artículo en Inglés | MEDLINE | ID: mdl-38395030

RESUMEN

Teachers have different perceptions of how to enhance student learning. Whereas some take a teacher-centred perspective, others lean more towards a student-centred approach. Many studies in higher education have invoked Korthagen's onion model (2014) to explain how teachers' perspectives can impact their teaching practices. Spanning six interrelated layers, this model contains both outer (environment, behaviour, competencies) and inner (beliefs, identity, and mission) aspects. Focusing essentially on teachers' outer aspects, previous studies have paid scant attention to how particular situations affect teachers' inner aspects and, consequently, how teachers perceive student-centred learning. In this descriptive qualitative study, we explored situations that encouraged or discouraged teachers to embrace student-centred beliefs, identities and missions. We held three focus-group discussions with 18 teachers from two Indonesian medical schools, performing a thematic analysis of the data thus obtained. We found that certain situations made teachers reflect on their inner aspects, which either favourably or adversely affected their acceptance of a student-centred learning approach. Teachers' outer aspects (i.e. their prior problem-based teaching and learning experiences, learning situations from their own training as well as clinical duties) strongly interacted with their inner aspects, thereby shaping their teaching perspectives. Understanding how specific situations can influence teachers' inner aspects might help institutions to design faculty development programmes that address teachers' specific educational needs.

18.
BMC Med Educ ; 24(1): 854, 2024 Aug 08.
Artículo en Inglés | MEDLINE | ID: mdl-39118034

RESUMEN

BACKGROUND: Medical students in Singapore engage in short term medical missions, locally known as Overseas Community Involvement Projects (OCIPs). Little is known about the learning outcomes of an OCIP and how this complements their medical education back home. Understanding this can help the medical educators structure the OCIP to optimise its learning value. OBJECTIVES: This study aims to gain an in-depth understanding of the experiences and learning outcomes of the medical students who participated in the OCIP. METHODS: This was a qualitative study involving Singaporean students from one medical school travelling to Nepal. Data was collected from reflective journals, overall group reflections and two focus group discussions. The data was thematically analysed using the Accreditation Council for Graduate Medical (ACGME) core competencies for medical professionals. RESULTS: The data could be classified under various themes within the six domains of the ACGME framework. The study revealed themes of: humanism, socioeconomic and cultural determinants of health under the domain of patient care, application of medical knowledge, investigating and evaluating the needs of a population and feedback to drive improvement under the domain of practice-based learning and improvement, use of non-verbal cues and communicating across language barriers under the domain of interpersonal and communication skills, healthcare systems and delivery, resourcefulness and adaptability, health equity and accessibility under the domain of systems-based practice, ethics, role-modelling, teamwork and leadership skills, interprofessional skills and resilience under the domain of professionalism. Understanding the students' motivations, utilising reflections, and following the patients' journey facilitated attainment of these outcomes. CONCLUSIONS: This OCIP experience translated to learning outcomes aligned with the ACGME framework. There is great potential for the experiential learning from a well-structured OCIP to help with personal and professional development and global health education.


Asunto(s)
Grupos Focales , Misiones Médicas , Investigación Cualitativa , Estudiantes de Medicina , Humanos , Estudiantes de Medicina/psicología , Singapur , Nepal , Femenino , Masculino , Educación de Pregrado en Medicina
19.
J Emerg Med ; 67(1): e89-e98, 2024 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-38824039

RESUMEN

BACKGROUND: To help improve access to care, section 507 of the VA MISSION (Maintaining Internal Systems and Strengthening Integrated Outside Networks) Act of 2018 mandated a 2-year trial of medical scribes in the Veterans Health Administration (VHA). OBJECTIVE: The impact of scribes on provider productivity and patient throughput time in VHA emergency departments (EDs) was evaluated. METHODS: A clustered randomized trial was designed using intent-to-treat difference-in-differences analysis. The intervention period was from June 30, 2020 to July 1, 2022. The trial included six intervention and six comparison ED clinics. Two ED providers who volunteered to participate in the trial were assigned two scribes each. Scribes assisted providers with documentation and visit-related activities. The outcomes were provider productivity and patient throughput time per clinic-pay period. RESULTS: Randomization to intervention resulted in decreased provider productivity and increased patient throughput time. In adjusted regression models, randomization to scribes was associated with a decrease of 8.4 visits per full-time equivalent (95% confidence interval [CI] 12.4-4.3; p < 0.001) and 0.5 patients per day per provider (95% CI 0.8-0.3; p < 0.001). Intervention was associated with increases in length of stay of 29.1 min (95% CI 21.2-36.9 min; p < 0.001), 6.3 min in door to doctor (95% CI 2.9-9.6 min; p < 0.001), 19.5 min in door to disposition (95% CI 13.2-25.9 min; p < 0.001), and 13.7 min in doctor to disposition (95% CI 8.8-18.6 min; p < 0.001). CONCLUSIONS: Scribes were associated with decreased provider productivity and increased patient throughput time in VHA EDs. Although scribes may have contributed to improvements in other dimensions of quality, further examination of the ways in which scribes were used is advisable before widespread adoption in VHA EDs.


Asunto(s)
Eficiencia Organizacional , Servicio de Urgencia en Hospital , United States Department of Veterans Affairs , Humanos , Servicio de Urgencia en Hospital/organización & administración , Servicio de Urgencia en Hospital/estadística & datos numéricos , United States Department of Veterans Affairs/organización & administración , United States Department of Veterans Affairs/estadística & datos numéricos , Estados Unidos , Eficiencia Organizacional/estadística & datos numéricos , Eficiencia , Documentación/métodos , Documentación/estadística & datos numéricos , Documentación/normas , Factores de Tiempo , Femenino
20.
Sensors (Basel) ; 24(12)2024 Jun 17.
Artículo en Inglés | MEDLINE | ID: mdl-38931688

RESUMEN

This study investigates the problem of rapid search planning for moving targets in maritime emergencies using an improved adaptive immune genetic algorithm. Given the complexity and uncertainty inherent in searching for moving targets in maritime emergency situations, a task planning method based on the improved adaptive immunogenetic algorithm (IAIGA) is proposed to enhance search efficiency and accuracy. This method utilizes a priori information to construct the potential regions of the target and the distribution probability within each region. It establishes a "prediction-scheduling" search strategy model, planning a rapid search task for disconnected targets based on overlapping probability through the IAIGA. By incorporating an immune mechanism, the algorithm enhances its global search capability and robustness. Additionally, the adaptive strategy enables dynamic adjustment of the algorithm's parameters to accommodate varying search scenarios. The experimental results demonstrate that the proposed IAIGA significantly outperforms traditional methods, providing higher search speeds and more accurate search results in the context of maritime emergency response. These findings offer effective technical support for maritime emergency operations.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA