Prof. Jinki Kim Profile

Prof. Jinki Kim

at Georgia Southern Univ

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Author

Publications (6)

Proceedings Article | 25 April 2023 Presentation + Paper

Liquid limit estimation of Kaolin clay using video-based vibration measurements

Matthew Sands, Evan Hayes, Soonkie Nam, Jinki Kim

Proceedings Volume 12488, 1248814 (2023) https://doi.org/10.1117/12.2658520

KEYWORDS: Liquids, Water content, Soil science, Video, Vibration, Motion estimation, Laser frequency, Cameras, Vibrometry, Tunable filters

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With a structure’s foundation and supporting ground generally being critical to its design and construction, understanding how soil behaves under various stress and drainage conditions is imperative. It is well known that certain characteristics and behaviors of soils with fines are highly dependent on water content and liquid limit is one of the important soil index properties to define such characteristics. However, conventional liquid limit measurement techniques can be easily affected by the proficiency of the operator, potentially leading to disastrous consequences. The dynamic properties of soils are required in numerous applications, and current testing techniques frequently call for specialized lab equipment, which is often pricy and delicate to test conditions. To address these concerns and advance the state of the art, this study explores a novel method to determine the liquid limit of cohesive soil by employing video-based vibration analysis which may precisely measure and identify the status of a soil’s water content. In this research, the modal characteristics of cohesive soil columns are extracted from videos by phase-based motion estimation. By utilizing the proposed method that analyzes the optical flow in every pixel of the series of frames that effectively represents the motion of corresponding points of the soil specimen, the vibration characteristics of the entire soil specimen could be assessed in a non-contact and non-destructive manner. The experimental investigation results compared with the liquid limit determined by the conventional method verify that the proposed method reliably and straightforwardly identifies the liquid limit of clay. It is envisioned that the proposed approach could be applied to measuring liquid limit of soil in practical field, entertaining its simple implementation that only requires a digital camera or even a smartphone without the need for special equipment or techniques that may be subject to the proficiency of the operator.

Proceedings Article | 25 April 2023 Presentation + Paper

Adaptive unsaturated stochastic resonance in parallel array and its application to acoustic emission signals

Jinki Kim, Matthew Sands, Evan Hayes

Proceedings Volume 12488, 124881T (2023) https://doi.org/10.1117/12.2658611

KEYWORDS: Interference (communication), Denoising, Bistability, Stochastic processes, Signal detection, Acoustic emission, Systems modeling, Contamination, Complex systems, Signal intensity

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Proceedings Article | 18 April 2022 Presentation + Paper

Characterization of hydrogel structures using video-based vibration analysis

Matthew Sands, Logan Sapp, Jinki Kim

Proceedings Volume 12047, 120470U (2022) https://doi.org/10.1117/12.2613248

KEYWORDS: Video, Vibrometry, Tissue engineering, Sensors, Reflectivity, Motion estimation, Image filtering, Time metrology, High speed cameras, Fourier transforms, Modal analysis

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Proceedings Article | 21 March 2019 Presentation + Paper

Vibration energy harvesting system with coupled bistable modules

Patrick Dorin, Jinki Kim, K. W. Wang

Proceedings Volume 10967, 109670G (2019) https://doi.org/10.1117/12.2513933

KEYWORDS: Energy harvesting, Complex systems, Magnetism, Bistability, Mathematical modeling, Numerical simulations, Transducers, Solids, Mechanical engineering, Environmental monitoring, Nonlinear dynamics

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Proceedings Article | 5 April 2017 Presentation + Paper

Signal denoising using stochastic resonance and bistable circuit for acoustic emission-based structural health monitoring

Jinki Kim, Ryan Harne, K. W. Wang

Proceedings Volume 10170, 1017016 (2017) https://doi.org/10.1117/12.2258733

KEYWORDS: Denoising, Stochastic processes, Signal detection, Structural health monitoring, Acoustic emission, Analog electronics, Environmental sensing, Oscillators, Signal to noise ratio, Sensors

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Proceedings Article | 8 March 2014 Paper

Impedance-based damage identification enhancement via tunable piezoelectric circuitry

Jinki Kim, K. W. Wang

Proceedings Volume 9061, 90610N (2014) https://doi.org/10.1117/12.2044475

KEYWORDS: Transducers, Inductance, System integration, Signal to noise ratio, Data modeling, Scanning electron microscopy, Mathematical modeling, Inverse problems, Finite element methods, Damage detection

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Showing 5 of 6 publications

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