Non-destructive method for evaluating local integrity of model piles using electromagnetic waves

D Lee, JD Yu, S Jeong, G Park, JS Lee - NDT & E International, 2024 - Elsevier
The objective of this study is to suggest a more accurate integrity estimation method in
drilled shafts using electromagnetic waves propagating through transmission lines. Model …

Detection of roadbed layers in mountainous area using down-up-crosshole penetrometer and ground penetrating radar

SY Kim, S Kang, G Park, D Lee, Y Lim, JS Lee - Measurement, 2024 - Elsevier
The characteristics and depths of the old roadbed layers must be assessed for the
serviceability and rehabilitation of aging road pavements. This study's objective is to detect …

Effects of weight and drop height of hammer on dynamic cone penetration test in loose layer

G Park, JS Lee, N Kim, D Lee, SY Kim - Measurement, 2023 - Elsevier
The objective of this study is to evaluate the effects of hammer weight and drop height on
compression stress, transferred energy, and strength index in loose layer. An instrumented …

THE ROLE OF DYNAMIC CONE PENETROMETER TESTING IN ASSESSING PAVEMENT SUBGRADE STRENGTH: A LITERATURE REVIEW

KE Garcia, OGD Cruz, MM Muhi… - GEOMATE …, 2024 - geomatejournal.com
In-situ tests for predicting geotechnical parameters related to shear strength, such as
California Bearing Ratio (CBR), typically require drilling boreholes and manual cone driving …

Response of sand added with various biopolymer contents under repetitive loading and freeze–thaw cycles

BK Kim, JS Lee, J Park, SY Kim - Transportation Geotechnics, 2024 - Elsevier
Biopolymers have recently been used as ecofriendly materials for soil improvement in terms
of stabilization, compressibility, and engineering parameters. The objective of this study is to …

Evaluation of electrical resistivity of cement-based materials using time domain reflectometry

D Lee, DJ Kim, JS Lee, E Tutumluer, YH Byun - Measurement, 2024 - Elsevier
Time domain reflectometry (TDR) is a widely used electromagnetic wave–based technique
for evaluating the volumetric water content of soils, although its use for moisture …

Hammer weight and dropping height effects on dynamic response in densely-packed geo-materials

G Park, JS Lee, N Kim, SY Kim - Transportation Geotechnics, 2024 - Elsevier
This study aims to investigate the dynamic cone penetration index (DCPI) and dynamic
responses during instrumented dynamic cone penetration test at fixed-end condition (eg …

Detection of air-and water-filled cavities beneath concrete plate using electromagnetic and acoustic waves

S Kang, JS Lee, N Kim, D Lee, J Park - NDT & E International, 2024 - Elsevier
Underground excavation and tunneling may result in cavities filled with air or water. This
study aims to detect cavities beneath underground concrete walls or tunnel linings and …

Feature analysis of precipitation-induced subgrade defects on a high-speed rail ballasted track using multiple track inspection data: A case study

J Xiao, Y Bai, C Song, S Sun… - … Part F: Journal of Rail and …, 2024 - journals.sagepub.com
Heavy rainfall has posed a great challenge to the service performance of high-speed rail
(HSR) substructure, resulting in a reduction in the ride quality and safety of high-speed …

Performance Degradation Assessment of Rolling Bearing Based on Difference of Eigenvalues in Random Matrix Theory

W Zhu, P Huang - 2023 10th International Conference on …, 2023 - ieeexplore.ieee.org
The difference of eigenvalues index based on Random Matrix Theory (RMT) was proposed
to overcome the problem that traditional feature extraction methods hardly extract effective …