Lee Sang-Hoon

Plastic deformation of semicrystalline polyethylene has been investigated via atomistic Monte Carlo and molecular dynamics simulations. Two deformation modes are considered, both consisting of tensile deformation in the longitudinal direction of the lamellar stack, with either constant lateral dimensions or constant total volume. Stress−strain curves, elastic moduli, yield stresses, and strains are determined at 350 K, with deformation strain rates (in molecular dynamics) ranging from 5 × 10 6 t

South Korea has a plan to realize a hydrogen economy, and it is essential to establish a main hydrogen pipeline for hydrogen transport. This study develops a cost estimation model applicable to the construction of hydrogen pipelines and conducts an economic analysis to evaluate various scenarios for hydrogen pipeline construction. As a result, the cost of modifying an existing natural gas to a hydrogen pipeline is the lowest, however, there are issues with the safety of the modified hydrogen pip

Composition-dependent changes in the properties of Ga-doped ZnO (GZO) transparent conductive oxide (TCO) films were investigated by preparing a series of GZO films on glass substrates via pulsed dc magnetron sputtering with ZnO ceramic targets having various Ga2O3 concentrations at various temperatures. As the Ga2O3 content in the target increased, crystalline quality was improved as revealed in the intense ZnO (0 0 2) diffraction peaks, which accompanied increased carrier concentrations. When t