CEO & Chief Research Scientist
APLG LLC
130 Fieldstone Circle
Ithaca, NY 14850
E-mail: kyk1@cornell.edu
130 Fieldstone Circle
Ithaca, NY 14850
E-mail: kyk1@cornell.edu
130 Fieldstone Circle
Ithaca, NY 14850
E-mail: kyk1@cornell.edu
Summary
Kwang Yul Kim, PhD, has made pioneering contributions to the fields of physics and engineering. He established the thermodynamics of elastic solids at finite non-hydrostatic stresses, and in the field of physical acoustics, he made the first experimental observations of the focusing of fast and slow transverse waves in anisotropic solids. Other fundamental contributions include the derivation of group velocity formulas for anisotropic solids and, in materials science and mechanics, the derivation of nonlinear elastic equations of state. He has also designed and fabricated a high-frequency PVDF transducer, miniature PZT sensors, and high-fidelity displacement capacitive transducers, which are essential to understanding the characteristics of acoustic emission sources and various phenomena in geometrical acoustics. His most recent contribution to mechanical engineering is the design and construction of the Absolute Precision Load Gauge (APLG). The APLG provides advantages over conventional load cells by directly calculating the applied load in units of force or mass, precluding the need for its calibration. It is the very first invention of its kind.
Dr. Kim was previously an invited international scholar at the University of Queensland in Brisbane, Australia, where he collaborated with Prof. Martin Veidt in the Dept. of Mechanical Engineering. He has also served as a review panelist for SBIR/STTR proposals submitted to the National Science Foundation.
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Born in Haenam County in Jeonnam Province, Korea, Dr. Kim received his BS in nuclear engineering from Seoul National University and his MS and PhD in materials science and engineering from Cornell University. He did a postdoctoral fellowship at the University of California, Berkeley. Following a decades-long career as a senior research scientist in Cornell’s Dept. of Theoretical and Applied Mechanics, he launched APLG LLC as CEO and chief research scientist.
Dr. Kim has published over 80 academic articles and technical papers. As a testament to his life’s work, there are currently over 1,250 citations of his research.
Expertise and Research Interests
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Physical Acoustics
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Piezoelectricity
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Acoustic Emission (AE)​
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High Pressure Generation
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Acoustoelasticity
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Wave Propagation
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AE Source Characterization
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Equation of State of Solids
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Ultrasonic Transducers
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Geometrical Acoustics
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Nondestructive Evaluation
Selected Publications
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Kim, Kwang Yul. “Design and Construction of an Absolute Precision Load/Stress Gauge,
Part I: Theoretical Methods,” 2023.
[View PDF]
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Kim, Kwang Yul. “Design and Construction of an Absolute Precision Load/Stress Gauge,
Part II: Experimental Methods,” 2023.
[View PDF]
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Kim, Kwang Yul. “Nonlinear elastic relations in equations of states of solids,” 2023.
[View PDF]
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Kim, Kwang Yul. “Design and Construction of an Absolute Precision Load Gauge: Theory and Experiment.” AIP Conference Proceedings, 2019, p. 040009.
https://doi.org/10.1063/1.5099759
[View PDF]
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Kim, Kwang Yul, Wei Zou, Steve Holland, et al. “Measurements of the Longitudinal Wave Speed in Thin Materials Using a Wideband PVDF Transducer.” The Journal of the Acoustical Society of America, vol. 114, no. 3, Sept. 2003, pp. 1450–1453. https://doi.org/10.1121/1.1562650
[View PDF]
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Kim, K. Y., and W. Sachse. “Acoustoelasticity of elastic solids.” In M. Levy, H. Bass, and R. Stern (Eds.), Handbook of elastic properties of solids, liquids, and gases 1, 2001, pp. 441–468. Cambridge, Massachusetts: Academic Press.
[View PDF]
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Kim, Kwang Yul, and W. Sachse. “Nonlinear elastic equation of state of solids subjected to uniaxial homogeneous loading.” Journal of Materials Science 35.13, 2000, pp. 3197–3205. https://doi.org/10.1023/A:1004890314757
[View PDF]​
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Kim, Kwang Yul. “Thermodynamics at Finite Deformation of an Anisotropic Elastic Solid.” Physical Review B, vol. 54, no. 9, Sept. 1996, pp. 6245–6254. https://doi.org/10.1103/PhysRevB.54.6245
[View PDF]
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Kim, Kwang Yul, Kathleen C. Bretz, Arthur G. Every, et al. “Ultrasonic Imaging of the Group Velocity Surface about the Cubic Axis in Silicon.” Journal of Applied Physics, vol. 79, no. 4, Feb. 1996, pp. 1857–1863.
https://doi.org/10.1063/1.361086
[View PDF​]
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Kim, Kwang Yul, Arthur G. Every, and Wolfgang Sachse. “Focusing of Quasi–Transverse Modes in Zinc at Ultrasonic Frequencies.” International Journal of Modern Physics B, vol. 08, no. 17, July 1994, pp. 2327–2352.
https://doi.org/10.1142/S0217979294000956
[View PDF]
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Kim, Kwang Yul, Arthur G. Every, and Wolfgang Sachse. “Focusing of Fast Transverse Modes in (001) Silicon at Ultrasonic Frequencies.” The Journal of the Acoustical Society of America, vol. 95, no. 4, Apr. 1994, pp. 1942–52.
https://doi.org/10.1121/1.408708
[View PDF]
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Every, A. G., and K. Y. Kim. “Time Domain Dynamic Response Functions of Elastically Anisotropic Solids.” The Journal of the Acoustical Society of America, vol. 95, no. 5, May 1994, pp. 2505–2516.
https://doi.org/10.1121/1.409860
[View PDF]
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Kim, Kwang Yul. “Analytic Relations between the Elastic Constants and the Group Velocity in an Arbitrary Direction of Symmetry Planes of Media with Orthorhombic or Higher Symmetry.” Physical Review B, vol. 49, no. 6, Feb. 1994, pp. 3713–3724. https://doi.org/10.1103/PhysRevB.49.3713
[View PDF]
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Kim, Kwang Yul, Wolfgang Sachse, and Arthur G. Every. “Focusing of Acoustic Energy at the Conical Point in Zinc.” Physical Review Letters, vol. 70, no. 22, May 1993, pp. 3443–3446. https://doi.org/10.1103/PhysRevLett.70.3443
[View PDF]
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Kim, Kwang Yul, and Wolfgang Sachse. “Generation of Elastic Waves from Line and Point Sources by a High-current Pulse Method.” The Journal of the Acoustical Society of America, vol. 86, no. 3, Sept. 1989, pp. 875–884.
https://doi.org/10.1121/1.398721
[View PDF​]
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Kim, Kwang Yul, and Wolfgang Sachse. “Study of Brittle Fracture by Acoustic Emission from Indentation Cracks.” Journal of Applied Physics, vol. 65, no. 11, June 1989, pp. 4234–4244. https://doi.org/10.1063/1.343306
[View PDF]
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Kim, Kwang Yul, Lin Niu, Bernard Castagnede, and Wolfgang Sachse. “Miniaturized Capacitive Transducer for Detection of Broadband Ultrasonic Displacement Signals.” Review of Scientific Instruments, vol. 60, no. 8, Aug. 1989, pp. 2785–2788. https://doi.org/10.1063/1.1140658
[View PDF]
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Kim, K. Y., and W. Sachse. “Thin-film acoustics: line-and point source generation and testing of thin films.” Progress in Acoustic Emission IV, 1988, pp. 98–105.
[View PDF]
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Kim, Kwang Yul, and Wolfgang Sachse. “Self-aligning Capacitive Transducer for the Detection of Broadband Ultrasonic Displacement Signals.” Review of Scientific Instruments, vol. 57, no. 2, Feb. 1986, pp. 264–267.
https://doi.org/10.1063/1.1138926
[View PDF]
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Kim, Kwang Yul, and Wolfgang Sachse. “X-ray Generated Ultrasound.” Applied Physics Letters, vol. 43, no. 12, Dec. 1983, pp. 1099–1101.
https://doi.org/10.1063/1.94240
[View PDF]
See more publications
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Inventions
Absolute Precision Load Gauge (APLG)
The APLG obviates the need for calibration against dead weight, making it the very first invention of its kind. Read article
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U.S. Patent #11366003 for Method and Apparatus for an Absolute Precision Load Gauge (APLG) granted to inventor Kwang Yul Kim on June 21, 2022.
Views of APLG Measurement System
Overall view of APLG system.
Front vew of three types of
ultrasonic tranducers.
Rear view of digital displacement
probe and tension spring.
Ultrasonic Transducers and Broadband Pulse Generator
Dr. Kim is also the inventor of a broadband high-current pulse generator and six different types of ultrasonic transducers, including three miniaturized transducers that are indispensable for investigating various phenomena in geometrical acoustics by the Point-Source and Point-Receiver (PS-PR) Method. Read more