A5100737622- Infrastructure Maintenance and Monitoring
- Structural Health Monitoring Techniques
- Engineering Applied Research
- Concrete Corrosion and Durability
- Microgrid Control and Optimization
- 3D Surveying and Cultural Heritage
- Optical measurement and interference techniques
- Islanding Detection in Power Systems
- Cryptographic Implementations and Security
- Concrete and Cement Materials Research
- Face recognition and analysis
- Geophysical Methods and Applications
- Advanced Battery Technologies Research
- Remote Sensing and LiDAR Applications
- Innovative concrete reinforcement materials
- Face and Expression Recognition
- Ultrasonics and Acoustic Wave Propagation
- Power Systems and Renewable Energy
- Flood Risk Assessment and Management
- Parallel Computing and Optimization Techniques
- Advanced Sensor and Energy Harvesting Materials
- Marine and Coastal Research
- Seismic Performance and Analysis
- Mechanical Engineering and Vibrations Research
- Ship Hydrodynamics and Maneuverability
Seoul National University of Science and Technology
2022-2024
Sungkyunkwan University
2009-2024
Samsung Medical Center
2014-2024
Kyungpook National University
2023-2024
Kyonggi University
2024
Korea Aerospace Research Institute
2009-2024
Samsung (South Korea)
2009-2023
Samsung Advanced Institute of Technology (South Korea)
2023
United States Air Force Research Laboratory
2023
Yonsei University
2008-2022
In concrete structures, surface cracks are important indicators of structural durability and serviceability. Generally, visually monitored by inspectors who record crack information such as the existence, location, width. Manual visual inspection is often considered ineffective in terms cost, safety, assessment accuracy, reliability. Digital image processing has been introduced to more accurately obtain from images. A critical challenge automatically identify an containing actual crack-like...
Crack assessment is an essential process in the maintenance of concrete structures. In general, cracks are inspected by manual visual observation surface, which intrinsically subjective as it depends on experience inspectors. Further, time-consuming, expensive, and often unsafe when inaccessible structural members to be assessed. Unmanned aerial vehicle (UAV) technologies combined with digital image processing have recently been applied crack overcome drawbacks inspection. However,...
This study aimed to investigate the self-heating characteristics of electrically conductive cement composites (ECCCs) and propose an effective affordable mix design for ECCC blocks that are applicable accelerated curing concrete with carbon black fibers employed as agents. Twelve proportions were prepared by varying fiber contents. A voltage application protocol was designed used examine capacities mixtures. The results show presence critical so electrical resistivities ECCCs 0.2 vol% less...
We developed a real-time robust facial expression recognition function on smartphone. To this end, we trained deep convolutional neural network GPU to classify expressions. The has 65k neurons and consists of 5 layers. size exhibits substantial overfitting when the training examples is not large. combat overfitting, applied data augmentation recently introduced technique called "dropout". Through experimental evaluation over various face datasets, show that outperformed classifier based...
To assess the current conditions of bridges in practice, a manual visual inspection is commonly used for maintenance purposes. Because time consuming, expensive, and laborious, computer vision with deep learning techniques has recently been introduced as promising tool automatic damage detection classification. However, localization difficult that close-up images do not contain global structural context, while knowing locations associated components essential interpreting overall health....
Bridges are one of the most important infrastructure systems that provide public and economic bases for humankind. It is also widely known bridges exposed to a variety flood-related risk factors such as bridge scour, structural deterioration, debris accumulation, which can cause damage even failure through modes. However, flood fragility has not received much attention seismic despite significant amount costs resulting from hazards. There have been few research efforts estimate considering...
Peak picking is used to determine locations of salient peaks in a graphical representation physical quantity. It often extract possible natural frequencies from the frequency domain structural responses. One challenges peak establish method automatically distinguish data containing noise peaks. As selecting intrinsically depends on human perception, algorithms for automated have exhibited only partial success date. This paper presents an that utilizes region-based convolutional neural...
As demand for long-span bridges is increasing worldwide, effective maintenance has become a critical issue to maintain their structural integrity and prolong lifetime. Given that stay-cable the principal load-carrying component in cable-stayed bridges, monitoring tension forces stay-cables provides data regarding condition of bridges. Indeed, various methodologies have been proposed measure cable forces, including magneto-elastic effect-based sensor technique, direct measurement using load...
The application of organic–inorganic perovskites has recently attracted increasing interest due to their excellent optoelectronic properties. As an emerging semiconductor, the doping capability and efficiency these materials require further clarification but have rarely been studied previously. In this study, diverse monovalent cations, Cu+, Na+, Ag+, are incorporated into phenethylammonium tin iodide ((PEA)2SnI4) perovskite, resultant lattice structural variation, film properties, thin-film...
Recent advances in computer vision algorithms have transformed the bridge visual inspection process. Those typically require large amounts of annotated data, which is lacking for generic scenarios. To address this challenge efficiently, research designs, develops, and demonstrates a platform that can provide synthetic datasets testing environments, termed Random Bridge Generator (RBG). The RBG produces photo-realistic 3D environments six types bridges randomly, automatically, procedurally....
This paper presents a simple-structured inertial igniter for thermal batteries of gun-fired munitions, where the setback acceleration generated by gun firing is employed to activate batteries. The igniter, composed ring-shaped slider supported spring, striker held locking balls, percussion primer, and housing, provides striking action (to primer) battery activation only when time profile satisfies predetermined threshold, thus preventing accidental ignition. A theoretical analysis an ANSYS...
The mechanical properties of lightweight aggregate concrete (LWAC) depend on the mixing ratio its binders, normal weight (NWA), and (LWA). To characterize relation between various components characteristics LWAC, extensive studies have been conducted, proposing empirical equations using regression models based their experimental results. However, these results obtained from laboratory experiments do not provide consistent prediction accuracy due to complicated materials mix proportions, a...