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Lanthanitin: A Chiral Nanoball Encapsulating 18 Lanthanum Ions by Ferritin-Like Assembly
Jeong, Kyung Seok,Kim, Young Shin,Kim, Yun Ju,Lee, Eunsung,Yoon, Ji Hye,Park, Won Hwa,Park, Young Woo,Jeon, Seung-Joon,Kim, Zee Hwan,Kim, Jaheon,Jeong, Nakcheol WILEY-VCH Verlag 2006 Angewandte Chemie Vol.45 No.48
<B>Graphic Abstract</B> <P>A chiral supramolecule, obtained by self-assembly of 24 chiral ditopic carboxylate ligands, 18 La ions, and two carbonate anions, has been dubbed lanthanitin because of its structural resemblance to ferritin. The picture shows the molecular structure of one enantiomer of lanthanitin. Color code: La blue, carbonate C green, C gray, O red; H omitted. <img src='wiley_img/14337851-2006-45-48-ANIE200603622-content.gif' alt='wiley_img/14337851-2006-45-48-ANIE200603622-content'> </P>
김현준 ( Hyun-jun Kim ),심민주 ( Min-joo Sim ),엄시우 ( Si-woo Eum ),서화정 ( Hwa-jeong Seo ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.2
텍스트 형식의 암호는 가용성이 높고 비용이 저렴한 장점으로 인해 가장 널리 사용되는 방식이다. 사용자는 암호를 알고 있어야 하므로 기억하기 쉬워야하므로 대부분의 암호는 편향되어 규칙성을 보인다. 암호 크래킹의 대부분은 이러한 규칙을 기반으로 수행된다. 최근에는 GAN, RNN, LSTM의 딥러닝 모델을 사용하여 암호 크래킹 연구에 적용되고 있으며 또한 다가오는 양자 컴퓨터 시대에서는 Grover의 알고리즘을 사용과 편향된 암호의 특성을 기반으로 사용자 암호에 대한 위협이 될 수 있다.
김은성(Kim, Eunsung),정순용(Jeong, Soon Yong),김유승(Kim, Yu Seung) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.4
전자기장 효과를 이용한 준설토 장거리 이송기술이 개발되었다. 개발 기술의 효과를 정량적으로 평가하기 위해 계측 시스템을 이용하여 측정한 유속분포와 압력강하를 중심으로 전자기장 도입으로 인한 효과를 판단하였다. 대체 물질에 의한 실내실험과 실제 준설현장에서 장거리 이송기술을 적용해본 결과, 펌프만 사용하여 이송하는 경우보다 평균유속은 물론, 특 별히 마찰층에서 속도증가가 있는 것을 확인하였다. 준설토 이송시, 이송관에 전자기장을 인가시켜줌으로써, 마찰층에서의 이송 저항을 감소시켜 전체적으로 속도를 증가시킴으로 인해 파이프에 의한 장거리 이송시 관내 압력강하를 줄이고, 유속을 증가시켜서 15km이상의 장거리 이송이 가능할 것으로 판단된다. The new developed long distance transport technology uses the effect of electro-magnetic energy. But it's difficult to estimate the new technology. We monitored the velocity profile and pressure drops in pipes and estimated the technology quantitatively from data analysis. Laboratory test and field test gave us that the effects of electro-magnetic energy changed the flow properties and increased the velocity, especially at the slip layer. When transporting the dredged soil, electro-magnetic field generation reduces the frictional resistances at the slip layer, increases the velocity of flow. Furthermore, it would be possible to transport the dredged materials up to 15km long with one pump station.
Mun, Yeongdong,Kim, Min Jeong,Park, Shin-Ae,Lee, Eunsung,Ye, Youngjin,Lee, Seonggyu,Kim, Yong-Tae,Kim, Sungjun,Kim, Ok-Hee,Cho, Yong-Hun,Sung, Yung-Eun,Lee, Jinwoo Elsevier 2018 Applied Catalysis B Vol.222 No.-
<P><B>Abstract</B></P> <P>We synthesized ordered mesoporous Fe/N/C with highly active Fe-N<SUB>x</SUB>/C sites denoted as m-FePhen-C as a non-precious metal catalyst (NPMC) for the oxygen reduction reaction in fuel cells. This was the first study that incorporated a catalyst precursor with Fe-N coordination directly in a simple block co-polymer-assisted soft-template method for the synthesis of mesoporous Fe/N/C. The synthesized catalyst (m-FePhen-C) showed a high catalytic performance comparable to that of Pt/C in half-cell tests, and a membrane electrode assembly (MEA) with an m-FePhen-C cathode exhibited 40% higher power density than did an MEA with a commercial Pt/C cathode in single-cell tests, with comparable electrode thicknesses. This result is highly meaningful in that generation of the Fe-N<SUB>x</SUB>/C active sites and formation of ordered mesoporous structure were achieved simultaneously in the simple soft-template-assisted process, and in that the advantages of mesoporous structure with appropriate pore size in metal-containing NPMC were elucidated for high-performance MEAs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mesoporous Fe/N/C catalyst with Fe-N<SUB>x</SUB>/C site is made by soft-template method. </LI> <LI> Fe-N<SUB>x</SUB>/C catalytic site shows high kinetic activity for oxygen reduction reaction. </LI> <LI> Large mesopores facilitate mass transport in cathode during fuel cell operation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
3D Sensing System for Laser-Induced Breakdown Spectroscopy-Based Metal Scrap Identification
Seongyun Park,Jaepil Lee,Eunsung Kwon,Daewon Kim,Sungho Shin,Sungho Jeong,Kyi-Hwan Park 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.3
Laser-induced breakdown spectroscopy (LIBS) is an analysis technique that determines the elemental composition of a target material. Metal scraps have a range of shapes and are contaminated with other substances such as paint or dirt. This makes it difficult to recognize each piece of metal scrap accurately and to obtain clear LIBS emission spectra of the target metals. In this study, two image processing algorithms are proposed to measure the three-dimensional shapes of metal scraps and to calculate the optimized (i.e., relatively clean and flat) surface areas of metal scraps. It was confirmed that 25% higher maximum classification accuracy was achieved when LIBS spectra were acquired from optimized rather than non-optimized (i.e., contaminated) surfaces.