Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Jung Doung Yu"'
Autor:
Jong-Sub Lee, Jung-Doung Yu
Publikováno v:
Developments in the Built Environment, Vol 17, Iss , Pp 100365- (2024)
This study aims to inspect grout defects in rock bolts using electromagnetic (EM) waves. The experiments are conducted using one intact rock bolt and eight defective rock bolts with defect ratios (DR) of 10–50%. A two-conductor transmission line is
Externí odkaz:
https://doaj.org/article/88aaace72173412e8069e87ee72b6657
Autor:
Jung-Doung Yu, Jong-Sub Lee, Bibek Tamang, Sungyong Park, Sukhyun Chang, Jungmyeon Kim, Yongseong Kim
Publikováno v:
Advances in Civil Engineering, Vol 2020 (2020)
This study aims to evaluate the sensing performance of glass fiber-reinforced polymer (GFRP) rock bolt sensors instrumented with strain gauges for monitoring rockslides. Experimental studies are conducted with four different types of GFRP rock bolt s
Externí odkaz:
https://doaj.org/article/bd29c2fc7a48492ba17b108ff61c2eef
Publikováno v:
Sensors, Vol 21, Iss 9, p 2941 (2021)
The objective of this study is to detect a cavity and estimate its size using sound waves in a laboratory model chamber filled with dry sand. One side of the chamber is covered with an acrylic plate, and a cavity is placed between the plate and sand.
Externí odkaz:
https://doaj.org/article/92831ba845e344d8b4e3b2334d743edb
Publikováno v:
Sensors, Vol 21, Iss 4, p 1226 (2021)
Shear wave velocity and small-strain shear modulus are widely used as the mechanical properties of soil. The objective of this study is to develop a new shear wave monitoring system using a pair of piezoelectric ring benders (RBs) and to evaluate the
Externí odkaz:
https://doaj.org/article/7fe4a999a6cc4e0a8d172b00b75b5672
Horizontally Elongated Time Domain Reflectometry System for Evaluation of Soil Moisture Distribution
Publikováno v:
Sensors, Vol 20, Iss 23, p 6834 (2020)
The objective of this study was to develop a horizontally elongated time domain reflectometry (HETDR) system to evaluate the water content in nonuniformly wetted soils. The HETDR probe consists of three rods of stainless steel and a cuboid head: A ce
Externí odkaz:
https://doaj.org/article/fec03a8aff9740748e1895e9976577e5
Publikováno v:
Sensors, Vol 20, Iss 22, p 6541 (2020)
This study investigates variations in the velocity and sensitivity of electromagnetic waves in transmission lines configured in defective model piles for the detection of necking defects containing soil. Experiments are performed with model piles con
Externí odkaz:
https://doaj.org/article/e9c01f1acf674640afcada9394928b4e
Publikováno v:
Sensors, Vol 20, Iss 18, p 5381 (2020)
Daily freezing-thawing-repetitive loading is a critical factor affecting soil stability. This study assesses the strength of sand–silt mixtures with various silt fractions (SFs) subjected to cyclic freezing-thawing-repetitive loading. Specimens wit
Externí odkaz:
https://doaj.org/article/ba219a1c53034f86bd9583615dc326ff
Autor:
Jung-Doung Yu, Jong-Sub Lee
Publikováno v:
Sensors, Vol 20, Iss 10, p 2821 (2020)
The stability of tunnels and rock slopes is adversely affected by defects in rock bolts. This study investigates the suitability of the smart sensing method using electromagnetic waves for inspecting defects in rock bolts. Experiments were performed
Externí odkaz:
https://doaj.org/article/40178ed185974048b2704a870841ab4c
Publikováno v:
Sensors, Vol 19, Iss 18, p 3841 (2019)
Ground moisture content and strength properties are the most important factors for a proper assessment of ground stability. This study developed a dynamic cone penetrometer incorporated with time domain reflectometry (TDR) sensors (TDCP). The TDCP is
Externí odkaz:
https://doaj.org/article/795db3d6897c40fc856815bd40eb46eb
Publikováno v:
Journal of the Korean Society of Hazard Mitigation. 21:239-249
The natural frequency is critical for evaluating the integrity of bridge piers. However, the natural frequency of bridge piers can vary with the support condition of the ground. The aim of this study is to investigate the natural frequency of bridge
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::16d5bd27033aa51eb3d67fa2ee8e99a0
https://doi.org/10.9798/kosham.2021.21.1.239
https://doi.org/10.9798/kosham.2021.21.1.239