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545 results on '"Yang, Jinkyu"'

110. Mesoscopic approach to granular crystal dynamics

Author

Gonzalez, Marcial, Yang, Jinkyu, Daraio, Chiara, and Ortiz, Michael

Subjects
Condensed Matter - Materials Science, Nonlinear Sciences - Pattern Formation and Solitons, Physics - Computational Physics
Abstract

We present a mesoscopic approach to granular crystal dynamics, which comprises a three-dimensional finite-element model and a one-dimensional regularized contact model. The approach investigates the role of vibrational-energy trapping effects in the dynamic behavior of one-dimensional chains of particles in contact (i.e., granular crystals), under small to moderate impact velocities. The only inputs of the models are the geometry and the elastic material properties of the individual particles that form the system. We present detailed verification results and validate the model comparing its predictions with experimental data. This approach provides a physically sound, first-principle description of dissipative losses in granular systems.

Published
2011
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111. Site-specific Quantification of Bone Quality using Highly Nonlinear Solitary Waves

Author

Yang, Jinkyu, Sangiorgio, Sophia, Borkowski, Sean, Silvestro, Claudio, De Nardo, Luigi, Daraio, Chiara, and Ebramzadeh, Edward

Subjects
Physics - Medical Physics, Physics - Instrumentation and Detectors
Abstract

Osteoporosis is a well recognized problem affecting millions of individuals worldwide. Consequently, the need to effectively, efficiently, and affordably diagnose and identify those at risk is essential; moreover, site-specific assessment of bone quality is necessary, not only in the process of risk assessment, but may also be desirable for other applications. The present study evaluated a new one-dimensional granular crystal sensor, composed of a tightly packed chain of beads under Hertzian contact interaction, representing the most suitable fundamental component for solitary wave generation and propagation. First, the sensitivity of the novel sensor was tested using densities of rigid polyurethane foam, representing clinical bone quality ranging from healthy, to severely osteoporotic. Once the relationship between the signal response and known densities was established, the sensor was used to measure several sites located in the proximal femur of ten human cadaveric specimens. The accuracy of the model was then further investigated, using measurements of bone quality from the same cadaveric specimens, independently, using DEXA. The results indicate not only that the novel technique is capable of detecting differences in bone quality, but that the ability to measure site-specific properties without exposure to radiation, has the potential to be further developed for clinical applications., Comment: This paper has been withdrawn to make it updated

Published
2010

112. Interaction of highly nonlinear solitary waves with linear elastic media

Author

Yang, Jinkyu, Silvestro, Claudio, Khatri, Devvrath, De Nardo, Luigi, and Daraio, Chiara

Subjects
Condensed Matter - Materials Science
Abstract

We study the interaction of highly nonlinear solitary waves in granular crystals, with an adjacent linear elastic medium. We investigate the effects of interface dynamics on the reflection of incident waves and on the formation of primary and secondary reflected waves. Experimental tests are performed to correlate the linear medium geometry, materials, and mass with the formation and propagation of the reflected waves. We compare the experimental results with theoretical analysis based on the long-wavelength approximation and with numerical predictions obtained from discrete particle models. Studying variations of the reflected wave's velocity and amplitude, we describe how the propagation of primary and secondary reflected waves responds sensitively to the states of the adjacent linear media. Experimental results are found to be in agreement with the theoretical analysis and numerical simulation. This preliminary study establishes the foundation for utilizing reflected solitary waves as novel information carriers in nondestructive evaluation of elastic material systems.

Published
2010
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126. Machine health management in smart factory: A review

Author

Lee, Gil-Yong, Kim, Mincheol, Quan, Ying-Jun, Kim, Min-Sik, Kim, Thomas Joon Young, Yoon, Hae-Sung, Min, Sangkee, Kim, Dong-Hyeon, Mun, Jeong-Wook, Oh, Jin Woo, Choi, In Gyu, Kim, Chung-Soo, Chu, Won-Shik, Yang, Jinkyu, Bhandari, Binayak, Lee, Choon-Man, Ihn, Jeong-Beom, and Ahn, Sung-Hoon

Published
2018
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127. Transfer of knowledge from model organisms to evolutionarily distant non-model organisms: The coral Pocillopora damicornis membrane signaling receptome

Author

Kumar, Lokender, primary, Brenner, Nathanael, additional, Sledzieski, Samuel, additional, Olaosebikan, Monsurat, additional, Roger, Liza M., additional, Lynn-Goin, Matthew, additional, Klein-Seetharaman, Roshan, additional, Berger, Bonnie, additional, Putnam, Hollie, additional, Yang, Jinkyu, additional, Lewinski, Nastassja A., additional, Singh, Rohit, additional, Daniels, Noah M., additional, Cowen, Lenore, additional, and Klein-Seetharaman, Judith, additional

Published
2023
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138. Discrete element model for cylindrical continuum unit-cells and formation of infinite frequency bandgap in woodpile chains

Author

Jang, Yeongtae, Yang, Jinkyu, and Kim, Eunho

Subjects
Condensed Matter - Other Condensed Matter
Abstract

We investigate infinite-broadband of graded one-dimensional local resonant granular chains, i.e., a graded woodpile lattice. A woodpile lattice is a type of granular crystal, consisting of horizontally-stacked cylindrical rods, whose natural modes strongly interfere with excitation waves. This phenomenon is a local resonance that results in a locally resonant bandgap in low-frequencies regimes, prohibiting wave propagation. To describe wave physics like local resonance, from linear to nonlinear regime in complex geometries, the discrete element or reduced-order model has been highly preferred. Here, we introduce a new method for a discrete element model (DEM), considering countable-infinity local resonance mode based on continuum mechanics. This approach can replicate a theoretical DEM for complex structures of geometric building blocks, which exploits a desired functional wave dynamic. Then, we characterize never-ending broadband in a graded woodpile structure based on the superposition principle, which demonstrates numerically graded local resonance effects by a newly developed analytical DEM. Regarding these results, we also verify experimentally. These findings could open a new way for broadband filtering using a graded local resonance mechanism, where performance can be functionally inverse designed into a discretization model., Comment: 36 pages, 8 figures

Published
2022

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