Korea National University of Transportation

MXene-integrated cobalt hydroxycarbonate with optimized interfacial architecture for high-performance lithium-ion battery anodes

Cobalt hydroxycarbonate (Co 2 (OH) 2 CO 3 ) is a promising anode material for lithium-ion batteries due to its high specific capacity, low cost, and facile synthesis. However, its practical application is limited by poor electronic and ionic conductivities and severe volume expan...

Particle creation, clock variables, and relabelling symmetry in pull-back variational fluids

Abstract Particle-number conservation is an off-shell kinematical identity of the standard pull-back variational formulation when the matter-space three-form depends only on the comoving labels of a constituent. We revisit the relabelling argument when the matter-space density al...

Environmental Risk Assessment of Triphenyl Phosphate in Freshwater, Sediment, and Soil

Background: Triphenyl phosphate (TPP) is an organophosphate flame retardant known to accumulate in the environment, including in surface water, sediment, and soil, ultimately resulting in toxicity.While continuous monitoring studies on TPP have been reported, ecological risk asse...

Aerodynamic performance of combined bogie fairings in an 8-car high-speed train

Aerodynamic drag accounts for 75%–80% of the total running resistance of high-speed trains operating above 300 km/h, and the bogie region significantly contributes to this drag due to its complex separated flow structures. This study investigates the aerodynamic performance and d...

Experimental and numerical analysis of aerodynamic drag reduction of high-speed train: impact of nose, bogie fairing and roof apparatus variations

Assessing aerodynamic modifications in high-speed trains requires quantifying drag reduction relative to previous designs and evaluating the improvement potential of an integrated configuration. This study investigated three-car configurations of the KTX-Cheongryong and HSEMU-370...

Compact wideband circularly polarized antenna and its self-decoupled MIMO configuration for 28-GHz band targeting 5G/6G millimeter-wave networks

Abstract Millimeter-wave communication has become a cornerstone of emerging 5G and future 6G systems due to its ability to support multi-gigabit data rates, ultra-low latency, and dense device connectivity. These performance requirements enforced constraints that are not limited...