Jin-Yeon Kim
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View article: Detection of alkali-silica reaction within large-scale concrete by ultrasound non-collinear wave mixing
Detection of alkali-silica reaction within large-scale concrete by ultrasound non-collinear wave mixing Open
Early detection of alkali-silica reaction (ASR) with nondestructive evaluation (NDE) is important for the monitoring of damage and assessment of repair performance, while effective NDE in large-scale reinforced concrete elements remains ch…
View article: On the large amplitude solution of the Boltzmann equation with large external potential and boundary effects
On the large amplitude solution of the Boltzmann equation with large external potential and boundary effects Open
The Boltzmann equation is a fundamental equation in kinetic theory that describes the motion of rarefied gases. In this study, we examine the Boltzmann equation within a $C^1$ bounded domain, subject to a large external potential $Φ(x)$ an…
View article: On the SH0 directivity of an array with flexible PZT transducers for beam steering control
On the SH0 directivity of an array with flexible PZT transducers for beam steering control Open
Shear horizontal (SH) guided waves find numerous applications for continuous health monitoring in plate-like structures in contact with a liquid due to limited acoustic energy leaking. This research focuses on the fundamental SH0 mode for …
View article: Use of a non-collinear wave mixing technique to image internal microscale damage in concrete
Use of a non-collinear wave mixing technique to image internal microscale damage in concrete Open
This research demonstrates the feasibility of using a non-collinear wave mixing technique to image internal microscale damage throughout the interior volume of a relatively large (28 cm thick) concrete component. By exploiting the underlyi…
View article: Analytical modeling of the evolution of the nonlinearity parameter of sensitized stainless steel
Analytical modeling of the evolution of the nonlinearity parameter of sensitized stainless steel Open
Austenitic stainless steels are subject to the precipitation of chromium carbides (M23C6) during exposure to high temperatures, causing these alloys to be susceptible to intergranular corrosion due to chromium depletion along grain boundar…
View article: Nonlinear ultrasonic technique for the characterization of microstructure in additive materials
Nonlinear ultrasonic technique for the characterization of microstructure in additive materials Open
This study employs nonlinear ultrasonic techniques to track microstructural changes in additively manufactured metals. The second harmonic generation technique based on the transmission of Rayleigh surface waves is used to measure the acou…
View article: Investigation of the relationship between classical and nonclassical ultrasound nonlinearity parameters and microstructural mechanisms in metals
Investigation of the relationship between classical and nonclassical ultrasound nonlinearity parameters and microstructural mechanisms in metals Open
This research studies two nonlinear ultrasound techniques: second harmonic generation and nonlinear resonant ultrasound spectroscopy, and the relationship to microstructural mechanisms in metals. The results show that there is a large chan…
View article: Wide‐angle 2D beam‐steering with Si‐based 16 × (1 × 16) optical phased arrays
Wide‐angle 2D beam‐steering with Si‐based 16 × (1 × 16) optical phased arrays Open
The authors demonstrate integrated 1D optical phased arrays (OPAs) for wide‐angle 2D beam‐steering. The 2D OPA consists of 16 1D transversal steering OPAs whose radiators have different grating periods, to assign different longitudinal ang…
View article: Waveguide‐input resonant tunnelling diode mixer for THz communications
Waveguide‐input resonant tunnelling diode mixer for THz communications Open
A hollow metallic waveguide‐input resonant tunnelling diode three‐terminal mixer device based on a photonic‐crystal platform for terahertz (THz) communication applications is presented. Coherent detection was successfully demonstrated, wit…
View article: Anomalous behavior of glass-forming ability and mechanical response in a series of equiatomic binary to denary metallic glasses
Anomalous behavior of glass-forming ability and mechanical response in a series of equiatomic binary to denary metallic glasses Open
Herein, we systematically investigated the impact of configuration entropy (CE) on the glass-forming ability (GFA) and mechanical response in a series of equiatomic binary Cu50Zr50 to denary (CuNiBeCoFe)50(ZrTiHfTaNb)50 metallic glasses (M…
View article: Terahertz wireless communications using resonant tunnelling diodes with radio‐over‐fibre
Terahertz wireless communications using resonant tunnelling diodes with radio‐over‐fibre Open
The authors examine a resonant tunnelling diode (RTD)‐based wireless transceiver system in conjunction with radio‐over‐fibre (RoF) and identify the performance limiting factors. Ultra high‐definition television 4K‐video over 1 km fibre and…
View article: Terahertz fibre transmission link using resonant tunnelling diodes integrated with photonic‐crystal waveguides
Terahertz fibre transmission link using resonant tunnelling diodes integrated with photonic‐crystal waveguides Open
The authors present an expanded porous polytetrafluoroethylene terahertz fibre transmission link using resonant tunnelling diodes integrated with photonic‐crystal waveguides as a transmitter and a receiver. The measured coupling efficiency…
View article: Nonlinear ultrasonic technique for the quantification of dislocation density in additive materials
Nonlinear ultrasonic technique for the quantification of dislocation density in additive materials Open
This research applies nonlinear ultrasonic techniques for the quantitative characterization of additively manufactured materials. The characterization focuses on identifying the dislocation density produced during the additive constructive…
View article: Excitation-dependent nonlinear behavior of distributed microcracks
Excitation-dependent nonlinear behavior of distributed microcracks Open
It is well known that microcracks generate strong higher harmonics in propagating monochromatic waves. There is a large amount of literature on modeling this phenomenon, but most of these existing papers only describe one specific mechanis…
View article: ACPD detection and evaluation of 475 °C embrittlement of aged 2507 super duplex stainless steels
ACPD detection and evaluation of 475 °C embrittlement of aged 2507 super duplex stainless steels Open
An investigation to evaluate embrittlement of thermally aged 2507 super duplex stainless steel (SDSS) by means of an accurate measurement of the electric conductivity using an alternating current potential drop (ACPD) probe is conducted. S…
View article: High‐speed error‐free wireless data transmission using a terahertz resonant tunnelling diode transmitter and receiver
High‐speed error‐free wireless data transmission using a terahertz resonant tunnelling diode transmitter and receiver Open
An error‐free wireless transmission of a 9 Gbit/s on–off keying modulated signal as well as a 4 k video signal is demonstrated using resonant tunnelling diodes as active elements in both the transmitter and the receiver. The employed syste…
View article: Detection of Corrosion and Wall Thinning in Carbon Steel Pipe Covered With Insulation Using Pulsed Eddy Current
Detection of Corrosion and Wall Thinning in Carbon Steel Pipe Covered With Insulation Using Pulsed Eddy Current Open
Non Destructive Testing (NDT) methods that are capable of detecting the wall thinning and defects through insulation and cladding sheets are necessary. In this study we developed a Pulsed Eddy Current (PEC) system to detect wall thinning o…
View article: Insights into alkali-silica reaction damage in mortar through acoustic nonlinearity
Insights into alkali-silica reaction damage in mortar through acoustic nonlinearity Open
The progression of damage as a result of alkali-silica reaction in mortar samples is monitored by using the Nonlinear Impact Resonance Acoustic Spectroscopy (NIRAS) method and expansion measurements, which were performed daily. Results of …
View article: Nonlinear Resonance Ultrasonic Spectroscopy of Precipitation in 17-4PH Stainless Steel
Nonlinear Resonance Ultrasonic Spectroscopy of Precipitation in 17-4PH Stainless Steel Open
Nonlinear resonance ultrasonic spectroscopy (NRUS) has been widely used to determine the hysteretic nonlinearity parameter, α for mesoscopic elastic materials. The current research adopts the NRUS to characterize microscopic material damag…
View article: Calibration of Air-Coupled Transducers for Absolute Nonlinear Ultrasonic Measurements
Calibration of Air-Coupled Transducers for Absolute Nonlinear Ultrasonic Measurements Open
We describe a novel calibration technique of air-coupled transducers for nonlinear ultrasonic measurements through homogenous, isotropic media. Our calibration technique combines laser interferometrywith a model-based approach to derive a …
View article: Simulative Evaluation of Intragrain Precipitate Influence on the Material Nonlinearity using Nonlinear Ultrasound
Simulative Evaluation of Intragrain Precipitate Influence on the Material Nonlinearity using Nonlinear Ultrasound Open
Nondestructive evaluation using ultrasonic waves is commonly used to experimentally probe for the presence of defects (i.e. dislocations, precipitates, cracks) in complex metallic microstructures. Such defects and abnormalities are evidenc…
View article: A contact mechanics based model for partially-closed randomly distributed surface microcracks and their effect on acoustic nonlinearity in Rayleigh surface waves
A contact mechanics based model for partially-closed randomly distributed surface microcracks and their effect on acoustic nonlinearity in Rayleigh surface waves Open
This research investigates the modeling of randomly distributed surface-breaking microcracks and the dependency of higher harmonic generation in Rayleigh surface waves on microcrack density. The microcrack model is based on micromechanical…