On the dynamics of air bubbles in Rayleigh–Bénard convection

Kim, Jin Tae; Nam, Jaewook; Shen, Shikun; Lee, Changhoon; Chamorro, Leonardo P.

doi:10.1017/jfm.2020.148

Cited by 19 publications

(16 citation statements)

References 30 publications

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“…The oscillatory behaviors for the LED units of the UD and OD can be captured by the high‐speed tracking method. [ 27 ] As expected, both devices exhibit damped harmonic oscillations (Figure 2L; Video S3, Supporting Information), from which the natural (resonant) frequency and damping ratios are characterized (Figure 2M,N). The OD shows ≈49% and ≈38% decreases in natural frequency and damping ratio, respectively, compared to those of the UD.…”

Section: Resultssupporting

confidence: 65%

Wireless, Skin‐Interfaced Devices for Pediatric Critical Care: Application to Continuous, Noninvasive Blood Pressure Monitoring

Liu

Kim

Kwak

et al. 2021

Adv Healthcare Materials

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Indwelling arterial lines, the clinical gold standard for continuous blood pressure (BP) monitoring in the pediatric intensive care unit (PICU), have significant drawbacks due to their invasive nature, ischemic risk, and impediment to natural body movement. A noninvasive, wireless, and accurate alternative would greatly improve the quality of patient care. Recently introduced classes of wireless, skin‐interfaced devices offer capabilities in continuous, precise monitoring of physiologic waveforms and vital signs in pediatric and neonatal patients, but have not yet been employed for continuous tracking of systolic and diastolic BP—critical for guiding clinical decision‐making in the PICU. The results presented here focus on materials and mechanics that optimize the system‐level properties of these devices to enhance their reliable use in this context, achieving full compatibility with the range of body sizes, skin types, and sterilization schemes typically encountered in the PICU. Systematic analysis of the data from these devices on 23 pediatric patients, yields derived, noninvasive BP values that can be quantitatively validated against direct recordings from arterial lines. The results from this diverse cohort, including those under pharmacological protocols, suggest that wireless, skin‐interfaced devices can, in certain circumstances of practical utility, accurately and continuously monitor BP in the PICU patient population.

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Section: Resultssupporting

confidence: 65%

Wireless, Skin‐Interfaced Devices for Pediatric Critical Care: Application to Continuous, Noninvasive Blood Pressure Monitoring

Liu

Kim

Kwak

et al. 2021

Adv Healthcare Materials

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“…To achieve continuous and simultaneous measurements with MA sensor and audio meter (Decibel X, calibrated by SD-4023 sound level meter and R8090 Sound Level Calibrator), approximately 10,000 frames were recorded for each respiratory activity. Preprocessing, calibration, tracking, and postprocessing are performed by a previously developed PTV code (59). Image sequences were preprocessed by subtracting the background noise and enhancing the contract.…”

Section: Methodsmentioning

confidence: 99%

Automated, multiparametric monitoring of respiratory biomarkers and vital signs in clinical and home settings for COVID-19 patients

Ouyang²,

Jeong³

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Capabilities in continuous monitoring of key physiological parameters of disease have never been more important than in the context of the global COVID-19 pandemic. Soft, skin-mounted electronics that incorporate high-bandwidth, miniaturized motion sensors enable digital, wireless measurements of mechanoacoustic (MA) signatures of both core vital signs (heart rate, respiratory rate, and temperature) and underexplored biomarkers (coughing count) with high fidelity and immunity to ambient noises. This paper summarizes an effort that integrates such MA sensors with a cloud data infrastructure and a set of analytics approaches based on digital filtering and convolutional neural networks for monitoring of COVID-19 infections in sick and healthy individuals in the hospital and the home. Unique features are in quantitative measurements of coughing and other vocal events, as indicators of both disease and infectiousness. Systematic imaging studies demonstrate correlations between the time and intensity of coughing, speaking, and laughing and the total droplet production, as an approximate indicator of the probability for disease spread. The sensors, deployed on COVID-19 patients along with healthy controls in both inpatient and home settings, record coughing frequency and intensity continuously, along with a collection of other biometrics. The results indicate a decaying trend of coughing frequency and intensity through the course of disease recovery, but with wide variations across patient populations. The methodology creates opportunities to study patterns in biometrics across individuals and among different demographic groups.

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“…Spatiotemporal maps of motions of this region of the anatomy determined by 3D particle tracking velocimetry (3D-PTV) provide quantitative insights into differential motions associated with respiratory and cardiac activities at these two locations and adjacent regions. 3D-PTV relies on optical techniques to track the Lagrangian paths of fiducial marks on the skin, in 3D using stereoscopic imaging ( 48 , 49 ), in a way that recapitulates the point-measurement modality of the IMUs. Here, 3D-PTV can capture the essence of dual sensing from the SN and SM by recording from four time-synchronized, high-speed cameras, each at a frame rate of 200 frames per second (fps) (fig.…”

Section: Resultsmentioning

confidence: 99%

Differential cardiopulmonary monitoring system for artifact-canceled physiological tracking of athletes, workers, and COVID-19 patients

Jeong

Lee

et al. 2021

Sci. Adv.

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Soft, skin-integrated electronic sensors can provide continuous measurements of diverse physiological parameters, with broad relevance to the future of human health care. Motion artifacts can, however, corrupt the recorded signals, particularly those associated with mechanical signatures of cardiopulmonary processes. Design strategies introduced here address this limitation through differential operation of a matched, time-synchronized pair of high-bandwidth accelerometers located on parts of the anatomy that exhibit strong spatial gradients in motion characteristics. When mounted at a location that spans the suprasternal notch and the sternal manubrium, these dual-sensing devices allow measurements of heart rate and sounds, respiratory activities, body temperature, body orientation, and activity level, along with swallowing, coughing, talking, and related processes, without sensitivity to ambient conditions during routine daily activities, vigorous exercises, intense manual labor, and even swimming. Deployments on patients with COVID-19 allow clinical-grade ambulatory monitoring of the key symptoms of the disease even during rehabilitation protocols.

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On the dynamics of air bubbles in Rayleigh–Bénard convection

Cited by 19 publications

References 30 publications

Wireless, Skin‐Interfaced Devices for Pediatric Critical Care: Application to Continuous, Noninvasive Blood Pressure Monitoring

Wireless, Skin‐Interfaced Devices for Pediatric Critical Care: Application to Continuous, Noninvasive Blood Pressure Monitoring

Automated, multiparametric monitoring of respiratory biomarkers and vital signs in clinical and home settings for COVID-19 patients

Differential cardiopulmonary monitoring system for artifact-canceled physiological tracking of athletes, workers, and COVID-19 patients

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