A5062503604- Numerical methods in engineering
- Innovative concrete reinforcement materials
- Rock Mechanics and Modeling
- Structural Behavior of Reinforced Concrete
- Concrete and Cement Materials Research
- Concrete Corrosion and Durability
- Fatigue and fracture mechanics
- Geophysical Methods and Applications
- Advanced Fiber Optic Sensors
- Mechanical Behavior of Composites
- Concrete Properties and Behavior
- Composite Material Mechanics
- Advanced Numerical Methods in Computational Mathematics
- Geotechnical Engineering and Underground Structures
- Structural Response to Dynamic Loads
- Non-Destructive Testing Techniques
- Renal Transplantation Outcomes and Treatments
- Advanced Fiber Laser Technologies
- Fluid Dynamics Simulations and Interactions
- Recycled Aggregate Concrete Performance
- Asphalt Pavement Performance Evaluation
- Network Packet Processing and Optimization
- Network Security and Intrusion Detection
- Drilling and Well Engineering
- Structural Load-Bearing Analysis
Yonsei University
2016-2025
University of Ulsan
2025
Ulsan College
2025
Kyoto University
2023
Hankuk University of Foreign Studies
2020
Korea Advanced Institute of Science and Technology
2012-2017
Pukyong National University
2014-2016
Siloam Eye Hospital
2014
University of Illinois Urbana-Champaign
2006-2012
CHA Bundang Medical Center
2010
Knowledge tracing is the task of understanding student's knowledge acquisition processes by estimating whether to solve next question correctly or not. Most deep learning-based methods tackle this problem identifying hidden representations states from learning histories. However, due sparse interactions between students and questions, can be easily over-fitted often fail capture accurately. This paper introduces a contrastive framework for that reveals semantically similar dissimilar...
SUMMARY Adaptive mesh refinement and coarsening schemes are proposed for efficient computational simulation of dynamic cohesive fracture. The adaptive consists a sequence edge‐split operators, whereas the is based on vertex‐removal (or edge‐collapse) operators. Nodal perturbation edge‐swap operators also employed around crack tip region to improve geometry representation, surface elements adaptively inserted whenever wherever they needed by means an extrinsic zone model approach. Such...
Abstract A mapping method is developed to integrate weak singularities, which result from enrichment functions in the generalized/extended finite element method. The integration scheme applicable 2D and 3D problems including arbitrarily shaped triangles tetrahedra. Implementation of proposed existing codes straightforward. Numerical examples for demonstrate accuracy convergence properties technique. Copyright © 2008 John Wiley & Sons, Ltd.
Currently, in concrete pavements, a single mixture design and structural surface layer are selected to resist mechanical loading without an attempt affect pavement shrinkage, ride quality, or noise attenuation adversely. An alternative approach is sublayers within the that have specific functions thus achieve higher performance at lower cost. The objective of this research was address benefits functionally graded materials (FGCMs) for rigid pavements by testing modeling fracture behavior...
This study proposes an artificial intelligence based framework for reconstructing the 3D multi-phase cement paste microstructure to evaluate its mechanical properties using simulation. The reconstruction of microstructures is performed modified generative adversarial networks (GANs) on microstructural images from micro-CT. For computational efficiency, 2D are first reconstructed and then extended microstructures. exhibit same features as original when characterized by probability functions....
During concrete pumping, the migration and redistribution of particles occur in a pipe lubrication layer that forms between bulk wall is governing factor determining flow behavior. In order to identify behavior this study, viscoelastic properties related microstructural flocculated suspension were examined by using dynamic oscillatory measurements. Cement paste assumed be constituent material ten cases mixing design are employed changing proportions mineral admixtures. The relationship yield...
Summary We present a general framework to solve elastodynamic problems by means of the virtual element method (VEM) with explicit time integration. In particular, VEM is extended analyze nearly incompressible solids using B‐bar method. show that, establish formulation in setting, one simply needs modify stability term stabilize only deviatoric part stiffness matrix, which requires no additional computational effort. Convergence numerical solution addressed relation stability, mass lumping...
This study investigated the punching shear behavior of full-scale, two-way concrete slabs reinforced with glass fiber polymer (GFRP) bars, which are known as noncorrosive reinforcement. The relatively low modulus elasticity GFRP bars affects large deflection flexural members, however, applying these to can compensate weakness stiffness due an arching action supporting girders. test results demonstrated that satisfied allowable and crack width under service load specified by design...
The concrete microstructure was successfully reconstructed using the complementarity of X-ray and neutron computed tomography (CT). Neither tomogram alone found to be suitable properly describe under this study. However, by merging information revealed two modalities, image segmentation, noise reduction, registration techniques we reconstruct microstructure. Void, aggregate, cement paste phases are captured down images' spatial resolution, even though aggregate consists multiple minerals....
The behavior of cement paste is significantly affected by the phase distribution characteristics within material. However, studying correlation between microstructural and intrinsic properties involves time-consuming experiments. Thus, simulations can help accelerating process. In this study, a method using micro-CT imaging analysis nanoindentation framework finite element was proposed to investigate mechanical paste. virtual specimen obtained from segmented into four phases: pore, inner...