C
Changhyun Lee
Publications - 12
Citations - 35
Changhyun Lee is an academic researcher. The author has contributed to research in topics: Fiber optic sensor & Fourier transform. The author has an hindex of 3, co-authored 11 publications receiving 25 citations.
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Journal ArticleDOI
Distributed Temperature Sensing Monitoring of Well Completion Processes in a CO2 Geological Storage Demonstration Site
TL;DR: Among three temperature calibration methods, the conventional method shows the best results, however, pointwise methods using heat coil or in-well divers also showed reliable accuracy, which allows them to be alternatives when theventional method is not affordable.
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Simulation of eccentricity effects on short- and long-normal logging measurements using a Fourier-hp-finite-element method*
Myung Jin Nam,David Pardo,David Pardo,Carlos Torres-Verdín,Seho Hwang,Kwon Gyu Park,Changhyun Lee +6 more
TL;DR: In this article, the Fourier series expansion is combined with a 2D goal-oriented high-order self-adaptive hp finite-element refinement strategy, where h denotes the element size and p the polynomial order of approximation within each element.
Journal ArticleDOI
Twisted Dual-Cycle Fiber Optic Bending Loss Characteristics for Strain Measurement.
TL;DR: It is shown that it is possible to measure load, tensile strain, and flexural strain using the proposed FOS head, and that the sensitivities, the operating ranges, and the sensing range can be adjusted depending on the deformation characteristics of the measurement target.
Journal ArticleDOI
Protection and Installation of FBG Strain Sensor in Deep Boreholes for Subsurface Faults Behavior Monitoring.
TL;DR: In this paper, the authors introduce two cases of installing fiber Bragg grating (FBG) strain sensors in 1 km boreholes to monitor the behavior of deep subsurface faults.
Journal ArticleDOI
Fault mapping using a generalized image point transform of three dimensional reverse VSP data
TL;DR: In this article, a generalized image point transform (GIP) is applied to 3D synthetic data having two dipping reflectors and the results are good consistency with the known geological structures.