Gemstone Team Research

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    INVESTIGATING METHODS OF BLOOD PRESSURE MEASUREMENT: COMPARING CORRELATIONS OF MULTIPLE PULSE TRANSIT TIMES TO BLOOD PRESSURE
    (2019) Anand, Aman; Ashai, Shereen; Bent, Michael; Foster, Jackson; Goldberg, Ryan; Murray, Eric; Sandoval, Jonathan; Stein, David; Weatherly, Sarah; Youngs, Nick; Hahn, Jin-Oh
    Currently, one in three American adults suffer from high blood pressure, a condition known as hypertension, yet only half have their condition under control (CDC, 2016). Methods of continuous blood pressure measurement have been examined by the team over the past few years. Using five hemodynamic interventions to fluctuate blood pressure, blood pressure data was gathered from 35 healthy adult participants. This data was useful in measuring pulse transit time and determining optimal locations for biosensor placement. Participants were also surveyed to collect public opinion on potential health monitoring devices for future development. Furthermore, the potential of using mobile device applications was examined as an alternative method of retrieving signals and calculating blood pressure. The results from this project indicate that for a mobile device application, the best signals to use for estimating blood pressure are PPG maximum to ECG R-wave, having an average correlation of - r = 0.73 for the systolic blood pressure and -r = 0.71 for the diastolic blood pressure.
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    Wind-Induced Vibration Energy Harvesting Using Piezoelectric Transducers Coupled with Dynamic Magnification
    (2014) Baker, Austin; Connolly, Kathryn; Dorsey, Lauren; Grissom, Ian; Grobicki, Alden; Keller, Kevin; Kittur, Chandan; Konecki, Daniel; Lee, Mark; Lee, Timothy; Ma, Boheng; Mulhern, Edward; Ng, Andrea; Patel, Mihir; Baz, Amr
    Flexible cylindrical structures subjected to wind loading experience vibrations from periodic shedding of vortices in their wake. Vibrations become excessive when the natural frequencies of the cylinder coincide with the vortex shedding frequency. In this study, cylinder vibrations are transmitted to a beam inside the structure via dynamic magnifier system. This system amplifies the strain experienced by piezoelectric patches bonded to the beam to maximize the conversion from vibrational energy into electrical energy. Realworld applicability is tested using a wind tunnel to create vortex shedding and comparing the results to finite element modeling that shows the structural vibrational modes. A crucial part of this study is conditioning and storing the harvested energy, focusing on theoretical modeling, design parameter optimization, and experimental validation. The developed system is helpful in designing wind-induced energy harvesters to meet the necessity for novel energy resources.