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NOVEL PSEUDOCERAMIDES AND THEIR SYNTHESIS USING ALKYL KETENE DIMER
Park, Ik Ju,Park, Byeong Deog,Song, Young Jin,Lee, Myungjin,Kim, Yoon 한국공업화학회 1997 응용화학 Vol.1 No.1
Nowadays, ceramides have been found to be an important component in the outermost layer of the skin - the stratum corneum (SC). It is understood that ceramides play an important role in structure and maintenance of the intercellular lipid lamella structure in the SC layer. Thus, many efforts have been made by the cosmetics and pharmaceutical industries to get human skin-identical ceramides or pseudoceramides which show similar performance with natural ceramides. The purpose of our study was to synthesize new pseudoceramides via an effective and economical synthetic pathway and to show their performance of skin restoration. Four kinds of the new pseudoceramides (PC-4, PC-4R, PC-5, PC-5R) were synthesized by the reaction of alcoholic amine and alkyl ketene dimer. First of all, PC-4 and PC-5 were synthesized by the reaction of 3-amino-1,2-propandiol and serinol with alkyl ketene dimer respectively. After that, PC-4R and PC-5R were produced by changing ketone group at β-position to amide bond of above synthesized PC-4 and PC-5 into hydroxyl group using NaBH₄ respectively. Their expected structures were conformed by the NMR, IR spectra, and elemental analysis.
Non-Contact Measurement of Current Distribution in Parallel Conductors by Using Hall Sensors
Myungjin Park,Sangbeom Byun,Wooseok Kim,Jikwang Lee,Kyeongdal Choi,Haigun Lee IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>A parallel HTS conductor to flow large current is essential for applications of HTS power device. Non-uniform current distribution in the parallel conductor is caused mainly due to the difference of inductance. There are a contact method which measures current directly and a non-contact method which measure indirectly. But current distribution of each conductor in parallel conductors can not be measured with conventional method. In this paper, we researched a measurement method to identify current distribution of the parallel conductor indirectly with Hall sensors and compared with the analysis results by 2-D FEM.</P>
User-Interfaced Guidance Scheme for Steering Swarm of magnetic nanoparticles
Myungjin Park,Jungwon Yoon 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
Magnetic Targeted Drug Delivery (MTDD) is a method to steer and concentrate magnetic nanoparticles (MNPs) at a desired location in body. Despite recent developments in magnetic navigation, only few comprehensive strategies for swarm of nanoparticles steering under dynamic fluid exists. This paper introduces a strategy for swarm of MNPs steering in a vascular network under dynamic fluid. In the proposed scheme, user steer aggregated particles to desired location in the MTDD simulator. The properties of aggregated particles are determined by experiment study. After, guidance process is done, guidance scheme which is generated by user is downloaded directly to real system. Effectiveness and feasibility of guidance scheme is demonstrated via simulation and experiment using 1μm diameter MNPs (SiMAG-Silanol 1101 of Chemicell Company) in a 1mm co-diameter Y-shaped channel. We have performed simulation studies with different fluid velocity (1mm/s, 5mm/s, 20mm/s and 100mm/s) and in-vitro studies at 5mm/s. Through both studies, we can demonstrate the potential of swarm of nanoparticles steering under the dynamic fluid. The proposed guidance method enables us to more accurately steer aggregated nanoparticles, improve targeting performance and can easily be extended to complex vessel model.
Control of Interfacial Layers for High-Performance Porous Si Lithium-Ion Battery Anode
Park, Hyungmin,Lee, Sungjun,Yoo, Seungmin,Shin, Myoungsoo,Kim, Jieun,Chun, Myungjin,Choi, Nam-Soon,Park, Soojin American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.18
<P>We demonstrate a facile synthesis of micrometer-sized porous Si particles via copper-assisted chemical etching process. Subsequently, metal and/or metal silicide layers are introduced on the surface of porous Si particles using a simple chemical reduction process. Macroporous Si and metal/metal silicide-coated Si electrodes exhibit a high initial Coulombic efficiency of ∼90%. Reversible capacity of carbon-coated porous Si gradually decays after 80 cycles, while metal/metal silicide-coated porous Si electrodes show significantly improved cycling performance even after 100 cycles with a reversible capacity of >1500 mAh g<SUP>–1</SUP>. We confirm that a stable solid-electrolyte interface layer is formed on metal/metal silicide-coated porous Si electrodes during cycling, leading to a highly stable cycling performance.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-18/am5046197/production/images/medium/am-2014-046197_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5046197'>ACS Electronic Supporting Info</A></P>
Conceptual Design of HTS Magnet for a 5 MJ Class SMES
Myungjin Park,Sangyeop Kwak,Wooseok Kim,Jikwang Lee,Jinho Han,Kyeongdal Choi,Hyunkyo Jung,Joonhan Bae,Seokho Kim,Kiduk Sim,Haejong Kim,Kichul Seong,Songyop Hanh IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>Superconducting magnetic energy storage (SMES) systems with High Temperature Superconducting (HTS) wires have been actively developed world-wide. A 600 kJ class SMES with Bi-2223 HTS wire has been in development as a national project since 2004 and is currently approaching the final testing stage of the first of three phases. In the second phase of the project, several MJ class HTS SMES will be developed. In this paper, designs of magnets for 5 MJ class SMES with DI-BSSCO and YBCO coated conductor are presented and compared.</P>
적층 배열형상에 따른 BSCCO 적층선재의 자호손실 특성 수치해석 및 측정
朴明陳(Myungjin Park),林炯佑(Hyoungwoo Lim),李光淵(Kwangyoun Lee),車貴守(Gueesoo Cha),李志光(Jikwang Lee) 대한전기학회 2006 전기학회논문지 B Vol.55 No.2
AC loss is one of the main research area in AC power application using high temperature superconductor(HTS), such as HTS transformer, HTS current limiter and HTS cable, because it is closely related to efficiency, economic estimation and design of power device. A lot of research for various arrangements of HTS tapes have been performed to increase a capacity of transport current because single HTS tape can not satisfy the demanded current capacity in HTS power application. In this paper, we studied magnetization loss by different several arrangements of BSCCO tapes such as Edge- to-Edge type, Face-to-Face type and Matrix type through numerical analysis by 2D-FEM and measurement. As a result, we got the result that the magnetization loss of Face-to-Face type arrangements was lower than those of other arrangement types under the conditions of the same stacking number. We think that the result was due to shield effect by demagnetization of adjacent HTS tapes which are located face to face.