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Related Concept Videos

Harmonic Mean01:09

Harmonic Mean

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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Maximum Size of Aggregate01:12

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The maximum size of aggregate is defined as the aperture of the sieve retaining 15 percent or more of the particles present in the aggregate sample. The aggregate's maximum size impacts the concrete's water requirement, workability, and strength. Larger aggregates reduce the surface area needing cement paste coverage, which can lower water needs, thereby allowing a decrease in the water-to-cement ratio when the desired workability and richness of the mix are to be maintained, which can...
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Simple Harmonic Motion01:21

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Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
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To determine the energy of a simple harmonic oscillator, consider all the forms of energy it can have during its simple harmonic motion. According to Hooke's Law, the energy stored during the compression/stretching of a string in a simple harmonic oscillator is potential energy. As the simple harmonic oscillator has no dissipative forces, it also possesses kinetic energy. In the presence of conservative forces, both energies can interconvert during oscillation, but the total energy remains...
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Estimating SpO2 via Time-Efficient High-Resolution Harmonics Analysis and Maximum Likelihood Tracking.

Feiyi Fan, Yuepeng Yan, Kun Zhao

    IEEE Journal of Biomedical and Health Informatics
    |July 4, 2018
    PubMed
    Summary
    This summary is machine-generated.

    This study presents ESPRIT-MLT, a new method for accurate blood oxygen saturation (SpO2) measurement using photoplethysmographic (PPG) signals, even with motion artifacts and low perfusion. It significantly improves accuracy and is suitable for wearable devices.

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    Area of Science:

    • Biomedical Engineering
    • Signal Processing
    • Medical Devices

    Background:

    • Noninvasive blood oxygen saturation (SpO2) measurement using photoplethysmographic (PPG) signals is crucial but highly susceptible to motion artifacts (MAs) and low perfusion.
    • Existing methods struggle to maintain accuracy under these challenging conditions, limiting the reliability of pulse oximetry.

    Purpose of the Study:

    • To introduce and evaluate a novel approach, ESPRIT-MLT, for robust SpO2 measurement in the presence of MAs and low perfusion.
    • To enhance the accuracy and reliability of PPG-based SpO2 monitoring for clinical and wearable applications.

    Main Methods:

    • The study utilizes a harmonic model of the PPG signal and a probability model for harmonic analysis.
    • The optimized parametric ESPRIT method is employed for accurate harmonic power estimation.
    • Maximum Likelihood SpO2 Tracking (MLT) is proposed to identify the most probable uncontaminated harmonic frequency.

    Main Results:

    • ESPRIT-MLT improved the probability of correct harmonic identification by 18.7% with MAs and 19.7% with low perfusion compared to the periodogram method.
    • Simulations showed lower RMSEs of 1.17% for MA-contaminated signals and 2.70% for extremely low perfusion (0.05%).
    • Subject tests with 20 participants across 4 activities yielded an average RMSE of 0.84% (±0.44%).

    Conclusions:

    • The ESPRIT-MLT method demonstrates superior accuracy and robustness in SpO2 measurement under challenging signal conditions.
    • Its time-efficiency makes it suitable for integration into wearable SpO2 monitoring devices.
    • The proposed technique holds significant potential for improving clinical pulse oximetry and daily wearable health monitoring.