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1.
BMC Health Serv Res ; 21(1): 663, 2021 Jul 06.
Artigo em Inglês | MEDLINE | ID: mdl-34229678

RESUMO

BACKGROUND: This article addresses the role of audit and feedback (A&F) to support change behaviour and quality improvement work in healthcare organisations. It contributes to the sparse literature on primary care centre (PCC) managers´ views on A&F practices, taking into account the broad scope of primary care. The purpose was to explore if and how different types of A&F support change behaviour by influencing different forms of motivation and learning, and what contextual facilitators and barriers enable or obstruct change behaviour in primary care. METHODS: A qualitative research approach was used. We explored views about the impact of A&F across managers of 27 PCCs, in five Swedish regions, through semi-structured interviews. A purposeful sampling was used to identify both regions and PCC managers, in order to explore multiple perspectives. We used the COM-B framework, which describes how Capability, Opportunity and Motivation interact and generate change behaviour and how different factors might act as facilitators or barriers, when collecting and analysing data. RESULTS: Existing forms of A&F were perceived as coercive top-down interventions to secure adherence to contractual obligations, financial targets and clinical guidelines. Support to bottom-up approaches and more complex change at team and organisational levels was perceived as limited. We identified five contextual factors that matter for the impact of A&F on change behaviour and quality improvement work: performance of organisations, continuity in staff, size of organisations, flexibility in leadership and management, and flexibility offered by the external environment. CONCLUSIONS: External A&F, perceived as coercive by recipients of feedback, can have an impact on change behaviour through 'know-what' and 'know-why' types of knowledge and 'have-to' commitment but provide limited support to complex change. 'Want-to' commitment and bottom-up driven processes are important for more complex change. Similar to previous research, identified facilitators and barriers of change consisted of factors that are difficult to influence by A&F activities. Future research is needed on how to ensure co-development of A&F models that are perceived as legitimate by health care professionals and useful to support more complex change.


Assuntos
Atenção à Saúde , Atenção Primária à Saúde , Estudos Transversais , Retroalimentação , Humanos , Pesquisa Qualitativa
2.
Acta Chir Orthop Traumatol Cech ; 88(3): 217-221, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34228618

RESUMO

PURPOSE OF THE STUDY After the surgical treatment of injuries of the lower extremities or osteotomies, patients are frequently asked to partially load the affected leg during the first weeks of rehabilitation. The patient's compliance to the prescribed weight bearing limit and their ability to regain a physiological gait as soon as possible are necessary for a fast rehabilitation without complications. MATERIAL AND METHODS/RESULTS To support patients during this important phase of recovery, we developed a feedback and analysis system that is able to provide feedback concerning loading and roll over behavior to the patient. The system is based on sensor insoles to measure the amount of pressure and pressure distribution and on a smartphone application to provide realtime visual and acoustic feedback. CONCLUSIONS This newly developed device has the potential to monitor the rehabilitation phase and assist patients with lower leg injuries therefore decrease the complication rate and enable faster rehabilitation. Key words: lower limb fracture osteotomy around the knee, partial weight bearing, realtime feedback, smartphone application.


Assuntos
Fraturas Ósseas , Retroalimentação , Humanos , Extremidade Inferior/cirurgia , Osteotomia , Suporte de Carga
3.
BMC Med Educ ; 21(1): 382, 2021 Jul 12.
Artigo em Inglês | MEDLINE | ID: mdl-34253221

RESUMO

BACKGROUND: Face-to-face feedback plays an important role in health professionals' workplace learning. The literature describes guiding principles regarding effective feedback but it is not clear how to enact these. We aimed to create a Feedback Quality Instrument (FQI), underpinned by a social constructivist perspective, to assist educators in collaborating with learners to support learner-centred feedback interactions. In earlier research, we developed a set of observable educator behaviours designed to promote beneficial learner outcomes, supported by published research and expert consensus. This research focused on analysing and refining this provisional instrument, to create the FQI ready-to-use. METHODS: We collected videos of authentic face-to-face feedback discussions, involving educators (senior clinicians) and learners (clinicians or students), during routine clinical practice across a major metropolitan hospital network. Quantitative and qualitative analyses of the video data were used to refine the provisional instrument. Raters administered the provisional instrument to systematically analyse educators' feedback practice seen in the videos. This enabled usability testing and resulted in ratings data for psychometric analysis involving multifaceted Rasch model analysis and exploratory factor analysis. Parallel qualitative research of the video transcripts focused on two under-researched areas, psychological safety and evaluative judgement, to provide practical insights for item refinement. The provisional instrument was revised, using an iterative process, incorporating findings from usability testing, psychometric testing and parallel qualitative research and foundational research. RESULTS: Thirty-six videos involved diverse health professionals across medicine, nursing and physiotherapy. Administering the provisional instrument generated 174 data sets. Following refinements, the FQI contained 25 items, clustered into five domains characterising core concepts underpinning quality feedback: set the scene, analyse performance, plan improvements, foster learner agency, and foster psychological safety. CONCLUSIONS: The FQI describes practical, empirically-informed ways for educators to foster quality, learner-centred feedback discussions. The explicit descriptions offer guidance for educators and provide a foundation for the systematic analysis of the influence of specific educator behaviours on learner outcomes.


Assuntos
Competência Clínica , Pessoal de Educação , Retroalimentação , Pessoal de Saúde , Humanos , Aprendizagem
4.
Sensors (Basel) ; 21(12)2021 Jun 18.
Artigo em Inglês | MEDLINE | ID: mdl-34207282

RESUMO

Autonomous vehicles are nowadays one of the most important technologies that will be incorporated to every day life in the next few years. One of the most promising kind of vehicles in terms of efficiency and sustainability are those known as Wing-in-Ground crafts, or WIG crafts, a family of vehicles that seize the proximity of ground to achieve a flight with low drag and high lift. However, this kind of crafts lacks of a sound theory of flight that can lead to robust control solutions that guarantees safe autonomous operation in all the cruising phases.In this paper we address the problem of controlling a WIG craft in different scenarios and using different control strategies in order to compare their performance. The tested scenarios include obstacle avoidance by fly over and recovering from a random disturbance in vehicle attitude. MPC (Model Predictive Control) is tested on the complete nonlinear model, while PID, used as baseline controller, LQR (Linear Quadratic Regulator) and adaptive LQR are tested on top of a partial feedback linearization. Results show that LQR has got the best overall performance, although it is seen that different design specifications could lead to the selection of one controller or another.


Assuntos
Dinâmica não Linear , Desenho de Equipamento , Retroalimentação
5.
MedEdPORTAL ; 17: 11162, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34263027

RESUMO

Introduction: Instruction in implicit bias is becoming prevalent across the spectrum of medical training. Little education exists for preclinical students, and guidance for faculty to facilitate such education is minimal. To address these gaps, we designed and delivered a single session for incoming first-year medical students and developed a facilitator training program. Methods: One faculty member delivered a 1-hour, multimedia, interactive lecture to all first-year medical students. Students subsequently met in small groups with trained facilitators. Activities included reflection, guided debriefing, and strategy identification to become aware of when they might be making an assumption causing them to jump to a conclusion about someone. The program evaluation consisted of aggregated student strategies and facilitator feedback during postsession debriefs, both analyzed through thematic analysis. Results: We delivered instruction to 1,098 students. Student strategies resulted in three themes: (1) humility, (2) reflection, and (3) partnering. The postsession debriefs uncovered opportunities to enhance the session. Lessons learned included presenting material to an entire class at once, allowing students to engage in dynamic discussion in the small groups, eliminating anonymous polling in the small groups, and highlighting management of implicit bias as essential to professional development. Discussion: Our instructional design enabled first-year medical students to identify at least one strategy to use when implicit biases are activated. The large-group session was deliverable by one faculty member, and volunteers successfully facilitated small-group sessions after only one training session, making this model a feasible innovation to reach an entire medical school class at the same time.


Assuntos
Estudantes de Medicina , Currículo , Retroalimentação , Humanos , Assistência ao Paciente , Preconceito
6.
Nutrients ; 13(6)2021 Jun 10.
Artigo em Inglês | MEDLINE | ID: mdl-34200678

RESUMO

Food homeostatic states (hunger and satiety) influence the cognitive systems regulating impulsive responses, but the direction and specific mechanisms involved in this effect remain elusive. We examined how fasting, and satiety, affect cognitive mechanisms underpinning disinhibition using a novel framework and a gamified test-battery. Thirty-four participants completed the test-battery measuring three cognitive facets of disinhibition: attentional control, information gathering and monitoring of feedback, across two experimental sessions: one after overnight fasting and another after a standardised meal. Homeostatic state was assessed using subjective self-reports and biological markers (i.e., blood-derived liver-expressed antimicrobial protein 2 (LEAP-2), insulin and leptin). We found that participants who experienced greater subjective hunger during the satiety session were more impulsive in the information gathering task; results were not confounded by changes in mood or anxiety. Homeostatic state did not significantly influence disinhibition mechanisms linked to attentional control or feedback monitoring. However, we found a significant interaction between homeostatic state and LEAP-2 on attentional control, with higher LEAP-2 associated with faster reaction times in the fasted condition only. Our findings indicate lingering hunger after eating increases impulsive behaviour via reduced information gathering. These findings identify a novel mechanism that may underpin the tendency to overeat and/or engage in broader impulsive behaviours.


Assuntos
Cognição/fisiologia , Homeostase , Fome/fisiologia , Testes Neuropsicológicos , Adolescente , Adulto , Peptídeos Catiônicos Antimicrobianos/metabolismo , Apetite/fisiologia , Atenção/fisiologia , Proteínas Sanguíneas/metabolismo , Tomada de Decisões , Retroalimentação , Feminino , Hormônios/metabolismo , Humanos , Masculino , Saciação , Adulto Jovem
7.
J Nurs Educ ; 60(7): 419-421, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34232820

RESUMO

BACKGROUND: Discussion boards are frequently used as learning strategies in online nursing courses. Student perceptions of this strategy have not been fully explored. This study aimed to determine student perspectives and preferences of discussion boards as learning strategies in online accelerated nursing courses. METHOD: This mixed-method pilot study described RN-to-Bachelor of Science in Nursing (RN-to-BSN) (n = 27) and Master of Science in Nursing: Nurse Educator (MSN-NE) (n = 37) student perceptions and preferences for discussion boards as learning strategies. RESULTS: Students had an overall positive perception about using discussion boards as learning strategies. RN-to-BSN students preferred a discussion summary over faculty participation. MSN-NE students preferred faculty participation but also found a summary to be helpful. CONCLUSION: A well-designed discussion can enhance student engagement and contribute to successful online learning experiences. Faculty should use a combination of real-time feedback through active participation and provide a discussion summary. Deciding how faculty should engage may depend on the complexity of course content being explored. [J Nurs Educ. 2021;60(7):419-421.].


Assuntos
Educação à Distância , Bacharelado em Enfermagem , Estudantes de Enfermagem , Docentes de Enfermagem , Retroalimentação , Humanos , Projetos Piloto
8.
Trials ; 22(1): 477, 2021 Jul 22.
Artigo em Inglês | MEDLINE | ID: mdl-34294137

RESUMO

BACKGROUND: The control of the dynamic functional leg alignment (dFLA) and biomechanical load are important joint-related aspects regarding the development of osteoarthritis (OA). Research on level walking with feedback on load-related parameters has provided innovative treatment possibilities. With regard to walking on sloped surfaces, fundamental biomechanical knowledge exists. However, comprehensive data on the agreement of kinematics and kinetics of self-paced ramp versus sloped treadmill walking is lacking. Further, deeper insights into the control of the dFLA during decline walking and the usefulness of real-time feedback are missing. METHODS/DESIGN: Thirty healthy participants aged between 18 and 35 years will be included. They will complete a three-dimensional gait analysis walking self-paced up and down on a 5-m ramp with a 10° inclination. Subsequently, speed-matched to ramp-up walking and self-paced 10° incline split-belt treadmill walking will be assessed. Afterwards, the participants will be observed under four different conditions of 10° declined walking on the same treadmill (a) self-paced walking, (b) self-paced walking with an internal focus of attention, (c) self-paced walking with real-time feedback, and (d) condition c speed-matched walking. The primary outcome parameter will be the frontal knee range of motion (fKROM). Secondary outcomes include the ground reaction force loading rate, spatial-temporal parameters, as well as sagittal, frontal and transversal kinematics, and kinetics for the lower extremities. DISCUSSION: The findings aim at improving the understanding of the effects of real-time feedback on the control of the dFLA and lower limb loading. Following clinical practicable methods for effective feedback devices can be developed and evaluated. Additionally, the first dataset comparing kinematic and kinetic parameters for decline and incline ramp walking versus walking on an instrumented treadmill will be available for appropriate intervention planning. TRIAL REGISTRATION: ClinicalTrials.gov NCT04763850 . Prospectively registered on 21 February 2021.


Assuntos
Marcha , Caminhada , Adolescente , Adulto , Fenômenos Biomecânicos , Teste de Esforço , Retroalimentação , Humanos , Cinética , Ensaios Clínicos Controlados Aleatórios como Assunto , Adulto Jovem
9.
Sensors (Basel) ; 21(14)2021 Jul 14.
Artigo em Inglês | MEDLINE | ID: mdl-34300535

RESUMO

Multibody modeling of mechanical systems can be applied to various applications. Human-in-the-loop interfaces represent a growing research field, for which increasingly more devices include a dynamic multibody model to emulate the system physics in real-time. In this scope, reliable and highly dynamic sensors, to both validate those models and to measure in real-time the physical system behavior, have become crucial. In this paper, a multibody modeling approach in relative coordinates is proposed, based on symbolic equations of the physical system. The model is running in a ROS environment, which interacts with sensors and actuators. Two real-time applications with haptic feedback are presented: a piano key and a car simulator. In the present work, several sensors are used to characterize and validate the multibody model, but also to measure the system kinematics and dynamics within the human-in-the-loop process, and to ultimately validate the haptic device behavior. Experimental results for both developed devices confirm the interest of an embedded multibody model to enhance the haptic feedback performances. Besides, model parameters variations during the experiments illustrate the infinite possibilities that such model-based configurable haptic devices can offer.


Assuntos
Retroalimentação , Fenômenos Biomecânicos , Humanos
10.
Comput Intell Neurosci ; 2021: 1716182, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34306047

RESUMO

In the detection of genome variation, the research on the internal correlation of reference genome is deepening; the detection of variation in genome sequence has become the focus of research, and it has also become an effective path to find new genes and new functional proteins. The targeted sequencing sequence is used to sequence the exon region of a specific gene in cancer gene detection, and the sequencing depth is relatively large. Traditional alignment algorithms will lose some sequences, which will lead to inaccurate mutation detection. This paper proposes a mutation detection algorithm based on feedback fast learning neural network position index. By establishing a position index relationship for ACGT in the DNA sequence, the subsequence is decomposed into the position relationship of different subsequences corresponding to the main sequence. The positional relationship of the subsequence in the main sequence is determined by the positional relationship. Analyzing SNP and InDel mutations, even structural mutations, through the position correlation of sequences has the advantages of high precision and easy implementation by personal computers. The feedback fast learning neural network is used to verify whether there is a linear relationship between two or more positions. Experimental results show that the mutation points detected by position index are more than those detected by Bcftools, Freebye, Vanscan2, and Gatk.


Assuntos
Algoritmos , Redes Neurais de Computação , Retroalimentação , Ordem dos Genes , Mutação , Análise de Sequência de DNA , Software
11.
Artigo em Inglês | MEDLINE | ID: mdl-34203753

RESUMO

The extensive body of literature on mentoring has largely ignored the developmental needs of mentors themselves. This conceptual and practice-oriented paper asks mentors and others to consider the needs of mentors who may or may not arrive ready to deal with the challenges of being effective mentors. The authors ask: how should mentors think about their own growth and development? Drawing on a broad spectrum of academic literatures, three frames are proposed for guiding mentors' thinking about themselves and four practices to spur their continuous improvement. The three frames are a simultaneous dual focus on people and tasks as mentors exercise leadership; an inclusive mind-set that works across the multidimensionality of identities in others and themselves; and a keen sense of the threats and rewards of managing the perceptions of others. We recommend the use of four practices for self-examination: engage in structured self-reflection; participate in standardized assessments to see others and one's self differently; build peer support among colleagues; and ask for feedback in concrete terms. We conclude by offering the benefits and challenges as mentors engage in the difficult work of acquiring in-depth self-awareness.


Assuntos
Tutoria , Mentores , Retroalimentação , Humanos , Liderança , Percepção
12.
Artigo em Inglês | MEDLINE | ID: mdl-34208784

RESUMO

The aim of the study was to estimate the level of the human resources index (HRI) measure among Swedish municipal employees, and to investigate the association between human resources index (HRI) and relational justice, short-term recovery, work environment-related production loss, and health-related production loss. A cross-sectional design was used with one sample of municipal employees (n = 6402). The results showed a positive association (r = 0.31) between human resources index (HRI) and relational justice; a positive (r = 0.27) association between HRI and short-term recovery; a negative association between HRI and work environment-related production loss (r = -0.37); and a negative association between HRI and health-related production loss (r = -0.23). The findings implicate that HRI captures important aspects of the work environment such as productivity, relational justice, and short-term recovery. The HRI measure is part of a support model used in workplaces to systematically address work environment-related issues. Monitoring changes in the HRI measure, it is possible to determine whether the measures taken effect production loss, perceived leadership, and short-term recovery in a work group. The support model using HRI may thus be used to complement traditional work environment surveys conducted in Swedish organizations as obliged by legal provisions.


Assuntos
Conservação dos Recursos Naturais , Local de Trabalho , Estudos Transversais , Retroalimentação , Humanos , Suécia , Recursos Humanos
13.
Blood Adv ; 5(13): 2760-2774, 2021 07 13.
Artigo em Inglês | MEDLINE | ID: mdl-34242391

RESUMO

Activation of blood coagulation and endothelial inflammation are hallmarks of respiratory infections with RNA viruses that contribute significantly to the morbidity and mortality of patients with severe disease. We investigated how signaling by coagulation proteases affects the quality and extent of the response to the TLR3-ligand poly(I:C) in human endothelial cells. Genome-wide RNA profiling documented additive and synergistic effects of thrombin and poly(I:C) on the expression level of many genes. The most significantly active genes exhibiting synergistic induction by costimulation with thrombin and poly(I:C) included the key mediators of 2 critical biological mechanisms known to promote endothelial thromboinflammatory functions: the initiation of blood coagulation by tissue factor and the control of leukocyte trafficking by the endothelial-leukocyte adhesion receptors E-selectin (gene symbol, SELE) and VCAM1, and the cytokines and chemokines CXCL8, IL-6, CXCL2, and CCL20. Mechanistic studies have indicated that synergistic costimulation with thrombin and poly(I:C) requires proteolytic activation of protease-activated receptor 1 (PAR1) by thrombin and transactivation of PAR2 by the PAR1-tethered ligand. Accordingly, a small-molecule PAR2 inhibitor suppressed poly(I:C)/thrombin-induced leukocyte-endothelial adhesion, cytokine production, and endothelial tissue factor expression. In summary, this study describes a positive feedback mechanism by which thrombin sustains and amplifies the prothrombotic and proinflammatory function of endothelial cells exposed to the viral RNA analogue, poly(I:C) via activation of PAR1/2.


Assuntos
Receptor PAR-1 , Trombina , Células Endoteliais , Retroalimentação , Humanos , RNA Viral
14.
Artigo em Inglês | MEDLINE | ID: mdl-34200657

RESUMO

OBJECTIVES: Feedback is an essential factor that may affect students' motor skill learning during physical education (PE) classes. This review aimed to (1) systematically examine the evidence for the effectiveness of feedback on students' skill learning during PE classes and (2) summarize the evidence for the effects of feedback elements (i.e., format and content). METHODS: A systematic search was conducted on seven electronic databases to identify studies that explored the effects of feedback on student learning during PE classes. Twenty-three studies were selected, and the study quality was evaluated using the Physiotherapy Evidence Database scale. The levels of evidence were determined with the best evidence synthesis. RESULTS: Strong evidence indicates the effectiveness of feedback intervention on students' skill learning compared with those who received no feedback. Limited evidence was found for the effect of visual feedback compared with verbal feedback. There were mixed results for the effectiveness of information feedback compared with praise or corrective feedback. CONCLUSION: The current evidence suggests that feedback is useful for skill learning during PE classes. Emergent questions still need to be addressed, such as those regarding the efficiency of using different formats and contents for feedback delivery to enhance motor skill learning during PE classes.


Assuntos
Destreza Motora , Educação Física e Treinamento , Competência Clínica , Retroalimentação , Humanos , Estudantes
15.
Sensors (Basel) ; 21(13)2021 Jul 05.
Artigo em Inglês | MEDLINE | ID: mdl-34283136

RESUMO

To aid the development of future unmanned naval vessels, this manuscript investigates algorithm options for combining physical (noisy) sensors and computational models to provide additional information about system states, inputs, and parameters emphasizing deterministic options rather than stochastic ones. The computational model is formulated using Pontryagin's treatment of Hamiltonian systems resulting in optimal and near-optimal results dependent upon the algorithm option chosen. Feedback is proposed to re-initialize the initial values of a reformulated two-point boundary value problem rather than using state feedback to form errors that are corrected by tuned estimators. Four algorithm options are proposed with two optional branches, and all of these are compared to three manifestations of classical estimation methods including linear-quadratic optimal. Over ten-thousand simulations were run to evaluate each proposed method's vulnerability to variations in plant parameters amidst typically noisy state and rate sensors. The proposed methods achieved 69-72% improved state estimation, 29-33% improved rate improvement, while simultaneously achieving mathematically minimal costs of utilization in guidance, navigation, and control decision criteria. The next stage of research is indicated throughout the manuscript: investigation of the proposed methods' efficacy amidst unknown wave disturbances.


Assuntos
Algoritmos , Retroalimentação , Movimento (Física)
16.
Sensors (Basel) ; 21(13)2021 Jul 05.
Artigo em Inglês | MEDLINE | ID: mdl-34283142

RESUMO

DC/DC converters are the essential component of power management in applications such as self-powered systems. Their simulation plays an important role in the configuration, analysis and design. A major drawback is the lack of behavioral models for DC/DC converters for long-term simulations (days or months). Available models are cycle-to-cycle-based due to the switch-mode nature of the converters and are therefore not applicable. In this work, we present a new behavioral model of a DC/DC power converter. The model is based on a thorough discussion of the model aspects that are relevant for self-powered systems, such as electrical representation and the causal connection if input and output. The model implementation is shown in the Modelica language and is available as an open-source library. The highlights of the model are a feedback controller for operation at the maximum power point (MPP), a loss-based efficiency function, and the start/stop behavior. The model's capabilities are demonstrated in a 24h-experiment to predict voltage levels and the conversion efficiency.


Assuntos
Fontes de Energia Elétrica , Eletricidade , Simulação por Computador , Retroalimentação
17.
Sensors (Basel) ; 21(13)2021 Jul 05.
Artigo em Inglês | MEDLINE | ID: mdl-34283148

RESUMO

Sports technology enhances athletes' performance by providing feedback. However, interaction techniques of current devices may overwhelm athletes with excessive information or distract them from their performance. Despite previous research, design knowledge on how to interact with these devices to prevent such occasions are scarce. To address this gap, we introduce subtle displays as real-time sports performance feedback output devices that unobtrusively present low-resolution information. In this paper, we conceptualize and apply subtle displays to tennis by designing Tactowel, a texture changing sports towel. We evaluate Tactowel through a remote user study with 8 professional tennis players, in which they experience, compare and discuss Tactowel. Our results suggest subtle displays could prevent overwhelming and distracting athletes through three distinct design strategies: (1) Restricting the use excluding duration of performance, (2) using the available routines and interactions, and (3) giving an overall abstraction through tangible interaction. We discuss these results to present design implications and future considerations for designing subtle displays.


Assuntos
Desempenho Atlético , Tênis , Atletas , Retroalimentação , Humanos , Tecnologia
18.
Sensors (Basel) ; 21(12)2021 Jun 16.
Artigo em Inglês | MEDLINE | ID: mdl-34208544

RESUMO

Google proposed the bottleneck bandwidth and round-trip propagation time (BBR), which is a new congestion control algorithm. BBR creates a network path model by measuring the available bottleneck bandwidth and the minimum round-trip time (RTT) to maximize delivery rate and minimize latency. However, some studies have shown that there are serious RTT fairness problems in the BBR algorithm. The flow with longer RTT will consume more bandwidth and the flows with shorter RTT will be severely squeezed or even starved to death. Moreover, these studies pointed out that even small RTT differences will lead to the throughput of BBR flows being unfair. In order to solve the problem of RTT fairness, an improved algorithm BBR-gamma correction (BBR-GC) is proposed. BBR-GC algorithm takes RTT as feedback information, and then uses the gamma correction function to fit the adaptive pacing gain. This approach can make different RTT flows compete for bandwidth more fairly, thus alleviating the RTT fairness issue. The simulation results of Network Simulator 3 (NS3) show that that BBR-GC algorithm cannot only ensure the channel utilization, but also alleviate the RTT fairness problem of BBR flow in different periods. Through the BBR-GC algorithm, RTT fairness is improved by 50% and the retransmission rate is reduced by more than 26%, compared with that of the original BBR in different buffer sizes.


Assuntos
Algoritmos , Simulação por Computador , Retroalimentação
19.
Sensors (Basel) ; 21(12)2021 Jun 16.
Artigo em Inglês | MEDLINE | ID: mdl-34208686

RESUMO

This work focuses on the design and construction of an experimental test bench of three degrees of freedom with application in educational environments. It is constituted by a gyroscopic structure that allows the movements of a quadcopter to analyze the control systems. In this context, the main features of the mechanical and electronic design of this prototype are described. At the same time, the main characteristics with respect to existing platforms are highlighted in aspects such as: system autonomy, cost, safety level, operation ranges, experimental flexibility, among others. The possible controller design approaches for quadcopter stabilization can extend to many basic and advanced techniques. In this work, to show the operation and didactic use of the platform, the development of the controller for tilt angle stabilization under two different approaches are presented. The first approach is through PID control, oriented for undergraduate students with basic level in control theory. The second approach is by means of State Feedback, oriented to students with more advanced level in this field. The result of this work is an open test bench, enabled for the experimentation of control algorithms using Matlab-Simulink.


Assuntos
Algoritmos , Movimento , Simulação por Computador , Retroalimentação , Humanos
20.
BMC Med Educ ; 21(1): 354, 2021 Jun 23.
Artigo em Inglês | MEDLINE | ID: mdl-34162382

RESUMO

BACKGROUND: Feedback is essential in a self-regulated learning environment such as medical education. When feedback channels are widely spread, the need arises for a system of integrating this information in a single platform. This article reports on the design and initial testing of a feedback tool for medical students at Charité-Universitätsmedizin, Berlin, a large teaching hospital. Following a needs analysis, we designed and programmed a feedback tool in a user-centered approach. The resulting interface was evaluated prior to release with usability testing and again post release using quantitative/qualitative questionnaires. RESULTS: The tool we created is a browser application for use on desktop or mobile devices. Students log in to see a dashboard of "cards" featuring summaries of assessment results, a portal for the documentation of acquired practical skills, and an overview of their progress along their course. Users see their cohort's average for each format. Learning analytics rank students' strengths by subject. The interface is characterized by colourful and simple graphics. In its initial form, the tool has been rated positively overall by students. During testing, the high task completion rate (78%) and low overall number of non-critical errors indicated good usability, while the quantitative data (system usability scoring) also indicates high ease of use. The source code for the tool is open-source and can be adapted by other medical faculties. CONCLUSIONS: The results suggest that the implemented tool LevelUp is well-accepted by students. It therefore holds promise for improved, digitalized integrated feedback about students' learning progress. Our aim is that LevelUp will help medical students to keep track of their study progress and reflect on their skills. Further development will integrate users' recommendations for additional features as well as optimizing data flow.


Assuntos
Estudantes de Medicina , Avaliação Educacional , Retroalimentação , Humanos , Design Centrado no Usuário , Interface Usuário-Computador
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