A5009897781- Surface Modification and Superhydrophobicity
- Advanced Sensor and Energy Harvesting Materials
- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Particle Accelerators and Free-Electron Lasers
- Anodic Oxide Films and Nanostructures
- Mechanical Behavior of Composites
- Particle accelerators and beam dynamics
- Adhesion, Friction, and Surface Interactions
- Microwave Engineering and Waveguides
- Antenna Design and Optimization
- Icing and De-icing Technologies
- Composite Structure Analysis and Optimization
- Fluid Dynamics and Heat Transfer
- Gyrotron and Vacuum Electronics Research
- Conducting polymers and applications
- Structural Analysis and Optimization
- Fatigue and fracture mechanics
- Metal and Thin Film Mechanics
- Aeroelasticity and Vibration Control
- Nanomaterials and Printing Technologies
- Millimeter-Wave Propagation and Modeling
- Smart Materials for Construction
- Material Properties and Applications
- Engineering Applied Research
Keimyung University
2025
Pohang University of Science and Technology
2015-2024
Korea Post
2011-2018
Government of the Republic of Korea
2015-2017
Pohang Accelerator Laboratory
2001-2013
In-Q-Tel
2013
Korea Institute of Robot and Convergence
2009
Korea Advanced Institute of Science and Technology
2004
National Dong Hwa University
2000
Pennsylvania State University
1996
Fatigue behavior of glass fiber reinforced epoxy composite materials has been studied analytically. A new concept called "fatigue modulus," which is defined as a slope applied stress and resultant strain at specific cycle introduced. modulus degradation using an assumption that the fatigue degrada tion rate follows power function cycle. Theoretical equation for predicting life formulated its rate. This rela simplified by failure criterion practical application. It proved final formula...
Engineered skeletal muscle tissues that mimic the structure and function of native have been considered as an alternative strategy for treatment various muscular diseases injuries. Here, it is demonstrated 3D cell-printing decellularized extracellular matrix (mdECM)-based bioink facilitates fabrication functional constructs. The cellular alignment shape tissue constructs are controlled by technology. mdECM provides cell-printed with a myogenic environment supports high viability...
Abstract Tissue engineering requires not only tissue‐specific functionality but also a realistic scale. Decellularized extracellular matrix (dECM) is presently applied to the extrusion‐based 3D printing technology. It has demonstrated excellent efficiency as bioscaffolds that allow of living constructs with elaborate microarchitectures well biochemical milieu target tissues and organs. However, dECM bioinks have poor printability physical properties, resulting in limited shape fidelity...
Cumulative damage during fatigue is studied analytically. Extensive reviews are per formed on the published models. Three different cumulative models defined using several physical variables such as modulus and resultant strain. Proposed model I modulus, while II III strains. derived functions of nor malized applied stress level, r, number cycle, n. It verified that proposed has better agreement with two level experimental data than other
In general, methyl orange (MO) can be degraded by an electrocatalytic oxidation process driven a power source due to the generation of superoxidative hydroxyl radical on anode. Here, we report hybrid energy cell that is used for self-powered degradation MO without using external source. The simultaneously or individually harvest mechanical and thermal energies. was harvested triboelectric nanogenerator (TENG) fabricated at top flexible polydimethysiloxane (PDMS) nanowire array with diameters...
With increasing amounts of oily water discharged from industrial and domestic sources, purifying emulsions using effective eco-friendly methods is great significance. Although functional membranes with selective wettabilities have been extensively explored for the efficient purification oil-in-water emulsions, development that use green inexpensive materials, are simple to fabricate, easy scale up remains very challenging. Herein, we report a approach uses biomass prepare membrane emulsions....
This paper describes a low-profile 2× 2 multi-input multi-output (MIMO) antenna system that is fully functional over the entire long-term evolution (LTE) spectrum 699-960 MHz (lower frequency spectrum) and 1710-2690 (higher applicable to real-life metallic smartphone platforms. The presented methodology entails utilizing longitudinal edges of ground plane amid an extremely narrow clearance mm. frame utilized along with stub network devise reconfigurable coupled loop topology. proposed × MIMO...
Superhydrophilic and superhydrophobic surfaces were studied with an eye to industrial applications use as research tools. Conventional methods involve complex time-consuming processes cannot feasibly produce large-area three-dimensional surfaces. Here, we report robust alumina nanowire structures or superhydrophilic properties, generated by inexpensive single-step anodization process that can routinely create arbitrary shapes. This is expected open up diverse applications.
A reduced tungsten oxide-carbon flexible electrode is fabricated by electrospinning, showing high electrochemical performances as a lithium-ion battery anode.
Water waves are a continuously generated renewable source of energy. However, their random motion and low frequency pose significant challenges for harvesting Herein, we propose spherical hybrid triboelectric nanogenerator (SH-TENG) that efficiently harvests the energy frequency, water waves. The SH-TENG converts kinetic wave into solid–solid solid–liquid simultaneously using single electrode. electrical output six degrees freedom in was investigated. Further, order to demonstrate from...
Accurate modeling of the hysteretic behavior reinforced concrete columns with non-seismic detailing is crucial for assessing seismic performance structures. While shear spring models are commonly used to capture nonlinear deformation in shear-critical columns, determining appropriate parameters these remains challenging and often relies on expert judgment. This study proposes predictive equations that can be integrated into fiber-section elements enhance accuracy columns. Specifically,...
Nanogenerators (NG) have been developed to harvest mechanical energy from environmental sources such as vibration, human motion, or movement of automobiles. We demonstrate a robust and large-area NG based on cost-effective Al substrate with the capability be easily integrated in series parallel for high-output performance. The output voltage current density three-dimensionally device reaches up 3 V 195 nA under walking conditions.