배재형 교수

The artificial hydrological cycle built by using deliquescent calcium chloride enables self-operation of a transpiration-driven electrokinetic power generator.

The use of Ti 3 C 2 T x MXenes/polyaniline composite tremendously improved the electrokinetic energy conversion efficiencies of nano-hydroelectric generators, demonstrating a power output sufficient to charge a commercial battery for the very first time.

) and low electrode potential (-3.04 V versus standard hydrogen electrode). Despite its promising characteristics, it faces formidable obstacles such as dendritic growth and poor formation of solid electrolyte interphase (SEI) layers. To overcome such obstacles, multifaceted unconventional surface engineering approaches are hypothesized, tested, and examined. In this review, in addition to the conventional SEI and surface coatings, the principles and recent progress of the unconventional surface

In this paper, we obtain the general solution and the stability of the bi-Jensen functional equation 4f µ x + y 2 ; z + w 2 ¶ = f(x;z) + f(x;w) + f(y;z) + f(y;w):

In this paper, we prove the generalized Hyers-Ulam stability of bi-homomorphisms in C¤-ternary algebras and of bi-derivations on C*-ternary algebras for the following bi-additive functional equation f(x + y, z − w) + f(x − y, z + w) = 2f(x, z) − 2f(y,w). This is applied to investigate bi-isomorphisms between C¤-ternary algebras.

Respiratory masks are the primary and most effective means of protecting individuals from airborne hazards such as droplets and particulate matter during public engagements. However, conventional electrostatically charged melt-blown microfiber masks typically require thick and dense membranes to achieve high filtration efficiency, which in turn cause a significant pressure drop and reduce breathability. In this study, we have developed a multielectrospinning system to address this issue by manip

Abstract Solar energy has seen 180 years of development since the discovery of the photovoltaic effect, having achieved the most successful commercialization in the energy‐harvesting fields. Despite its long history, even the most state‐of‐the‐art photovoltaics remain confined to solid‐state devices, limiting spatial and light utilization efficiencies. Herein, a liquid‐state photoenergy harvester based on a photoacid (PA), a chemical that releases protons upon light irradiation and recombines wi

Abstract The lithium metal anode is notoriously unstable and reactive to electrolytes, forming brittle solid‐electrolyte interphase (SEI) layers with uneven distribution, exacerbating Li dendrites that ultimately limit the battery life. Here, this work passivates Li metal with electrolyte‐swellable polymer nanolayers deposited monolithically by the initiated chemical vapor deposition (iCVD) to reinforce the native SEI layers and stabilize their interface. The 100 nm iCVD poly(dimethylaminomethyl

We obtain the general solutions of the cubic functional equation<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mtext>3</mml:mtext><mml:mrow><mml:mo>[</mml:mo><mml:mrow><mml:mi>g</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mi>x</mml:mi><mml:mo>+</mml:mo><mml:mi>y</mml:mi></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mo>+</mml:mo><mml:mi>g</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mi>x</mml:mi><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow><mml:mo>)</mml:mo>

We obtain the generalized Hyers-Ulam stability of the bi-quadratic functional equation f x y, z w f x y, zw f xy, z w f xy, zw 4 f x, z f x, w f y, z f y, w in quasinormed spaces.

We obtain the general solution and the stability of the functional equation f ( x + y + z , u + v + w ) + f ( x + y − z , u + v + w ) + 2 f ( x , u − w ) + 2 f ( y , v − w ) = f ( x + y , u + w ) + f ( x + y , v + w ) + f ( x + z , u + w ) + f ( x − z , u + v − w ) + f ( y + z , v + w ) + f ( y − z , u + v − w ). The function f ( x , y ) = x 3 + a x + b − y 2 having level curves as elliptic curves is a solution of the above functional equation.

Photoenergy Harvesting In article number 2201734, Il-Doo Kim and co-workers develop a photoacid-driven liquid-state photoenergy harvester (PLPH) as the first demonstration of a photoacid-solution-based device that generates electric energy from light. Asymmetric light exposure on the PLPH generates electric energy by the light-induced pH gradient (ΔpH = 2) along the two electrodes This unique approach offers a new way to harness solar energy in a form-factor-free design that maximizes space and

Abstract See manuscript PDF for complete Abstract:In this paper, we give some properties of the bi-Jensen functional equation \[4f\left(\frac{x+y}{2}, \frac{z+w}{2}\right)=f(x,z)+ f(x,w)+ f(y,z)+ f(y,w)\] and the Hyers-Ulam stability is investigated. Also, we establish the Hyers-Ulam stability of the bi-Jensen functional equation on some restricted domains. Finally, we apply the obtained results to study some of interesting asymptotic behaviors of bi-Jensen functions.