Kwangwoon University

About: Kwangwoon University is a education organization based out in Seoul, South Korea. It is known for research contribution in the topics: Thin film & Resonator. The organization has 4020 authors who have published 8217 publications receiving 104365 citations.

Some identities of Frobenius-Euler polynomials arising from umbral calculus

Abstract: In this paper, we study some interesting identities of Frobenius-Euler polynomials arising from umbral calculus.

Latest trends in molecular imprinted polymer based drug delivery systems

Abstract: Molecular imprinted polymers (MIP) are promising and versatile materials that have been used for the determination of many different analytes. In the last few years, MIPs have been substantially employed for various biomedical applications, especially drug delivery systems (DDS), owing to some of their unique features such as specific recognition by imprinting the desired analyte, suitability in rough experimental conditions, and targeted and sustained drug release. Hence, this review is focused on the development of strategies undertaken for their application to drug delivery systems involving several different administration routes (i.e. transdermal, ocular and oral routes) published between 2014 and now. Herein, we have also highlighted the summaries of published works, in order to gain a better understanding of the synthetic strategies employed and the analytical performances of the reported MIPs, in addition to pointing out the challenges and future perspectives of MIP based DDS.

Novel Flexible Transparent Conductive Films with Enhanced Chemical and Electromechanical Sustainability: TiO2 Nanosheet-Ag Nanowire Hybrid.

Abstract: Flexible transparent conductive films (TCFs) of TiO2 nanosheet (TiO2 NS) and silver nanowire (Ag NW) network hybrid were prepared through a simple and scalable solution-based process. The as-formed TiO2 NS–Ag NW hybrid TCF shows a high optical transmittance (TT: 97% (90.2% including plastic substrate)) and low sheet resistance (Rs: 40 Ω/sq). In addition, the TiO2 NS–Ag NW hybrid TCF exhibits a long-time chemical/aging and electromechanical stability. As for the chemical/aging stability, the hybrid TCF of Ag NW and TiO2 NS reveals a retained initial conductivity (ΔRs/Rs 4000%) or RuO2 NS–Ag NW hybrid (ΔRs/Rs > 200%). As corroborated by the density functional theory simulation, the superb chemical stability of TiO2 NS–Ag NW hybrid is attributable to the unique role of TiO2 NS as a barrier, which prevents Ag NW’s chemical corrosion via the attenuated adsorption of sulfidation molecules (H2S) on TiO2 NS. With respect to the...

Stability and Performance of Haptic Interfaces with Active/Passive Actuators--Theory and Experiments

Abstract: This paper addresses both theoretical and experimental studies of the stability and performance of haptic interfaces containing active/passive actuators. Three different realizations of haptic interfaces are introduced to investigate their stability and performance: an active system equipped with a motor; a passive system equipped with a brake; and a hybrid system equipped with both brake and motor. The first objective is to demonstrate that a hybrid system is superior in its stability and performance to an active system via passivity theorem and Z-width. The second objective of this paper is to show that the conditions for the asymptotic stability of haptic interfaces during the static friction display are investigated via the absolute stability theory. Theoretical and experimental results are compared. An alternative haptic interface is proposed that provides its highly stable haptic interaction with high performance.

Ni-Zn Ferrite Screen Printed Power Inductors for Compact DC-DC Power Converter Applications

Abstract: In this paper, PCB embedded power inductors have been designed, fabricated, and characterized for low power compact DC-DC converter applications by using screen-printing and low temperature processing technologies. These proposed power inductors were comprised of screen-printed Ni-Zn soft ferrite composite cores and two layer vertically stacked spiral type coils. The double stacked spiral coil geometry was applied to reduce the size and to increase the inductance value of the proposed power inductor. The fabricated power inductor with double stacked circular type coils and 9 windings exhibited an inductance of 0.81 muH, a quality factor of 45 at 10 MHz, and a DC rated current of 470 mA. Its size (4.5 mm times 4.5 mm times 0.5 mm (height)) was much smaller than the previously reported devices. The circular type power inductors had smaller size and better performance characteristics than the rectangular type ones.