Person:
Sprigle, Stephen

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https://hdl.handle.net/1853/71727
 https://orcid.org/0000-0003-0462-0138
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0000-0003-0462-0138
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Now showing 1 - 7 of 7
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    Design of a Robotic System to Measure Propulsion Work of Over-ground Wheelchair Maneuvers
    (Georgia Institute of Technology, 2014) Liles, Howard ; Huang, Morris ; Caspall, Jayme ; Sprigle, Stephen
    A wheelchair-propelling robot has been developed to measure the efficiency of manual wheelchairs. The use of a robot has certain advantages compared to the use of human operators with respect to repeatability of measurements and the ability to compare many more wheelchair configurations than possible with human operators. Its design and implementation required significant engineering and validation of hardware and control systems. The robot can propel a wheelchair according to pre-programmed accelerations and velocities and measures the forces required to achieve these maneuvers. Wheel velocities were within 0.1 m/s of programmed values and coefficients of variation (CV) < 2%. Torque measurements were also repeatable with CV <10%. By determining the propulsion torque required to propel the wheelchair through a series of canonical maneuvers, task-dependent input work for various wheelchairs and configurations can be compared. This metric would serve to quantify the combined inertial and frictional resistance of the mechanical system.
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    Anatomical Model Propulsion System: Measuring Manual Wheelchair Efficiency
    (Georgia Institute of Technology, 2010) Dao, Phuc ; Sprigle, Stephen ; Caspall, Jayme ; Ferri, Aldo A. ; Eicholtz, Matthew ; Wang, Stan
    The goal of this project was to produce a test device and methodology capable of measuring the mechanical efficiency of manual wheelchairs. The result would provide an objective measure of wheelchair performance that are required to effectively prescribe wheelchairs and to code wheelchairs properly for reimbursement.
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    iMachine: Measuring Manual Wheelchair Mass Properties
    (Georgia Institute of Technology, 2010) Eicholtz, Matthew ; Sprigle, Stephen ; Ferri, Al ; Caspall, Jayme ; Dao, Phuc ; Wang, Stan
    Mass properties are important parameters in dynamic systems analysis, but may be difficult to estimate for irregularly-shaped objects. Specifically, the iMachine is designed to analyze manual wheelchairs in an effort to determine the propulsion efficiency using the Anatomical Model Propulsion System (AMPS).
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    Anatomical Model Propulsion System (AMPS): Measuring Manual Wheelchair Efficiency
    (Georgia Institute of Technology, 2009) Dao, Phuc ; Eicholtz, Matt ; Caspall, Jayme ; Sprigle, Stephen ; Ferri, Aldo A.
    The goal of this project was to produce a test device and methodology capable of measuring the mechanical efficiency of manual wheelchairs. The result would provide an objective measure of wheelchair performance that are required to effectively prescribe wheelchairs and to code wheelchairs properly for reimbursement.
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    A Data Processing Method to Measure the Use of Manual Wheelchairs
    (Georgia Institute of Technology, 2009) Sonenblum, Sharon Eve ; Caspall, Jayme ; Lopez, Ricardo ; Sprigle, Stephen
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    Multispectral Image Analysis of Bruise Age
    (Georgia Institute of Technology, 2007) Sprigle, Stephen ; Yi, Dingrong ; Caspall, Jayme ; Linden, Maureen ; Kong, Linghua
    The detection and aging of bruises is important within clinical and forensic environments. Traditionally, visual and photographic assessment of bruise color is used to determine age, but this qualitative technique has been shown to be inaccurate and unreliable. Spectroscopy and multi-spectral imaging have demonstrated objectivity in identifying age-dependent features. However these devices are not well suited for clinical environments. The purpose of this study was to develop a technique to spectrally-age bruises that minimizes the filtering and hardware requirements while achieving acceptable accuracy. This approach will then be incorporated into a handheld, point-of-care technology that is clinically-viable and affordable. Sixteen bruises from elder residents of a long term care facility were imaged over time. A multi-spectral system collected images at 11 wavelengths ranging between 370-970 nm that corresponded to skin and blood chromophores. Normalized bruise reflectance (NBR)- defined as the ratio of optical reflectance coefficient of bruised skin over that of normal skin- was calculated for all bruises at all wavelengths. The smallest mean NBR, regardless of bruise age, was found at wavelength between 555 & 577nm suggesting that contrast in bruises are from the hemoglobin chromophores, and that they linger for a long duration. A contrast metric, based on the NBR at 460nm and 650nm, was found to be sensitive to age and requires further investigation. Overall, the study identified four key wavelengths that have promise to characterize bruise age. However, the high variability across bruises complicates the development of a handheld detection system until additional data is available.
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    Development of Handheld Erythema and Bruise Detectors
    (Georgia Institute of Technology, 2007) Sprigle, Stephen ; Caspall, Jayme ; Kong, Linghua ; Duckworth, Mark