Minkwan Kim

A hygroscopic polymer thin film successfully encapsulates an organic–inorganic halide perovskite layer, showing enhanced stability of the solar cell operating in a humid atmosphere.

Aqueous zinc-ion batteries (AZIBs) are receiving increasing attention for power-grid energy storage systems. Nevertheless, warranting long-term reversible operation is not trivial owing to uncontrolled interfacial phenomena related to zinc dendritic growth and parasitic reactions. Herein, the addition of hexamethylphosphoramide (HMPA) to the electrolyte revealed the surface overpotential (|η_s|) to be a key metric of the reversibility. HMPA adsorbs onto active sites on the zinc metal s

Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.

Despite substantial progresses, in aqueous zinc ion batteries (AZIBs), developing zinc metal anodes with long-term reliable cycling capabilities is nontrivial because of dendritic growth and related parasitic reactions on the zinc surface. Here, we exploit the tip-blocking effect of a scandium (Sc³⁺ ) additive in the electrolyte to induce uniform zinc deposition. Additional to the tri-valency of Sc³⁺ , the rigidity of its hydration shell effectively prevents zinc ions from

Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.

Superresolution fluorescence microscopy possesses an important role for the study of processes in biological cells with subdiffraction resolution. Recently, superresolution methods employing the emission properties of fluorophores have rapidly evolved due to their technical simplicity and direct applicability to existing microscopes. However, the application of these methods has been limited to samples labeled with fluorophores that can exhibit intrinsic emission properties at a restricted times

The sheath shape in a cylindrical electrode system is simulated by using a 2-D fluid model. The cylindrical electrode system introduces an electron-depleted region, i.e., a sheath. The generated sheath may suggest a possible approach to the communication blackout problem that occurs for a reentry vehicle, in hypersonic flight or during laser interaction with a target. This approach can work if the electron-depleted sheath region extends over the vehicle surface up to the peak of the plasma densi

The atmospheric entry phase of a Mars mission is one of the most important mission phases of the nearly two-year journey. During the entry, a vehicle experiences major difficulties which are related to heating, communication, and deceleration. To solve these entry issues, the typical methods, such as the thermal protection system and aerodynamic parachute, are employed. However, these methods have limitations as a solution of Mars entry issues because of the properties of the Martian atmosphere.

Studies are described for modeling electron energy phenomena for hypersonic flows. The electron energy must be modeled separately from other energy modes because it may have a significant effect on vibrational relaxation and chemical reactions. Whenever flows are in a strong thermal nonequilibrium state, an electron energy equation should be considered. In the considered electron energy equation, the electron energy relaxations of each energy mode are accounted for, which include translational-e

This study introduces a cutting-edge electrolyte formulation that mitigates Li metal corrosion, significantly extending the calendar life of LMBs. Based on the SEI swelling model, hydrocarbons kinetically block the highly corrosive F-diluent entry.

Abstract Commercialization of lead halide perovskite-based devices is hindered by their instability towards environmental conditions. In particular, water promotes fast decomposition, leading to a drastic decrease in device performance. Integrating water-splitting active species within ancillary layers to the perovskite absorber might be a solution to this, as they could convert incoming water into oxygen and hydrogen, preserving device performance. Here, we suggest that a CuSCN nanoplatelete/p-

Background Severe tricuspid regurgitation (TR) should be intervened before the development of irreversible right ventricular (RV) dysfunction. However, current guidelines do not provide criterion related to RV systolic function to guide optimal surgical timing. We investigated the prognostic value of RV longitudinal strain in patients undergoing isolated surgery for severe functional TR. Methods and Results We enrolled 115 consecutive patients (aged 62±10 years; 23.5% men; 62.6% [n=72] with prev

This thesis uses numerical simulation to study a new communication method for addressing radio blackout during hypersonic flight. The radio blackout problem is an important issue for hypersonic vehicles because of flight safety, catastrophe analysis, and mission success. During the last 50 years, several approaches have been proposed to solve radio blackout. However, from the Apollo reentry capsule to the Space shuttle, vehicles have experienced difficulties in communication and vehicle tracking

We investigated sex-related differences in the prognosis of patients with hypertrophic cardiomyopathy (HCM) using the Korea National Health Insurance Service database. From 2010 to 2016, 9524 patients diagnosed with HCM and had more than 1-year follow-up period were analyzed. The primary endpoint was the composite of cardiovascular death or new-onset heart failure (HF) admission. Propensity score-matching analysis was performed to adjust for different baseline characteristics. With a 4.4-years'