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Lee, Jong-Min,Upare, Pravin P.,Chang, Jong-San,Hwang, Young Kyu,Lee, Jeong Ho,Hwang, Dong Won,Hong, Do-Young,Lee, Seung Hwan,Jeong, Myung-Geun,Kim, Young Dok,Kwon, Young-Uk Wiley (John WileySons) 2014 CHEM SUS CHEM Vol.7 No.11
<P>Catalytic hydrogenation of organic carboxylic acids and their esters, for example, cellulosic ethanol from fermentation of acetic acid and hydrogenation of ethyl acetate is a promising possibility for future biorefinery concepts. A hybrid conversion process based on selective hydrogenation of butyric acid combined with fermentation of glucose has been developed for producing biobutanol. ZnO-supported Ru-Sn bimetallic catalysts exhibits unprecedentedly superior performance in the vapor-phase hydrogenation of biomass-derived butyric acid to n-butanol (>98% yield) for 3500?h without deactivation.</P>
Majority gate logic using current-induced magnetic domain wall motion
San Ko,Geun-Hee Lee,Byong-Guk Park,Kab-Jin Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Existing computing technology is based on von Neumann architecture which is composed of memory unit for storing information and processing unit for performing logic operation. As the memory and processor are physically separated, data transfer between them consumes a substantial energy and time, which is known as von Neuman bottleneck. One way to overcome this bottleneck is to combine the memory and processor in a single space. This so-called processor in memory (PiM) technology will improve the performance of computer dramatically [1]. In this presentation, we propose a majority gate logic that utilizes the current-induced magnetic domain walls (DWs) motion, which can directly be connected to the DW-based racetrack memory [2,3,4] to build PiM. We use cross-wire geometry having four discrete branches, of which three branches are inputs and the other branch is output, and demonstrate that the cross-wire performs as majority gate by using micromagnetic simulations. The DWs created at the input branches are moved by current-induced spin orbit torque [5,6] and are congregated at the cross, from which the majority of the inputs are ejected to the output branches. This majority gates operates as AND, OR, NAND, NOR logic operations by properly selecting the inputs. In addition to the simulation, we also experimentally verify the DW-based majority gate in Co/Pt microwires. The current-driven DW motion and its logic operation is successfully demonstrated in Co/Pt cross-wire, suggesting that the majority gate is experimentally achievable.
고산(San Ko),이근희(Geun-Hee Lee),김갑진(Kab-Jin Kim),박병국(Byong-Guk Park) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.5
We propose a universal spintronic logic device based on the current-induced magnetic domain wall (DW) motion. The majority gating operation is demonstrated by micromagnetic simulation using spin-orbit torque (SOT)-driven DW motion in Hall bar structures with perpendicular magnetic anisotropy. The logic gates including AND, OR, NAND, NOR are demonstrated, indicating the universality of DW majority gate. The simulation is partially confirmed by experiment, in which we found that the asymmetry in DW motion induced by Dzyaloshinskii-Moriya interaction or local Oersted field can cause the device malfunction. Our result suggests that the DW motion can be used not only in memory device but also in logic device, which could be useful in future processing-in-memory computing technology.
백두산(Du-San Baek),양윤상(Yoon-sang Yang),이동훈(Dong-Hoon LEE),박춘근(Chun-Geun Park) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
지하철 터널과 고속철도 터널 및 자동차 전용도로에 건설된 터널과 같은 경우는 반폐쇄적인 공간적 특성으로 인하여 음에너지 밀도가 매우 높은 반사음장이 형성되어 강한 세기의 음파가 터널 입구와 출구 방향으로 전파되어 터널 입출구 근방에서 또 다른 소음문제를 야기시킨다. 그러나 지금까지는 터널내부에서의 소음저감을 다룬 연구가 대부분이었으며[1~3], 터널 입구와 출구에서의 소음저감 대책이나 소음전파 특성에 대한 연구결과가 발표된 사례는 거의 없었다. 따라서 본 연구에서는 터널 입구와 출구방향으로 방사되는 소음을 저감시키기 위한 일환으로 관 출구를 경사지게 하거나 관 출구에 다양한 크기의 플랜지를 부착하면서 소음전파 특성을 측정하고 음향해석 결과와 비교하였다. In the tunnel of rail way or motorcar road, reflection sound field with high density sound energy has been generated and radiated to entrance, And then it leads to another noise problem around tunnel entrance. But most of researches were conducted about noise reduction at inside of tunnel and the study on the noise reduction countermeasure or noise propagation characteristics at entrance of tunnel has scarcely been performed. Therefore, to reduce the radiated noise from tunnel exit we measured both noise directivity and reflection coefficient and compared those with simulation results by changing the conditions of inclined exit or flange attached to exit.
류마티스관절염에 동반된 ANCA 관련 불충분-면역성 사구체신염 2예
구본산 ( Bon San Koo ),김용길 ( Young Gil Kim ),최종기 ( Jong Gi Choi ),안용철 ( Yong Chul Ahn ),이성근 ( Seung Geun Lee ),이창근 ( Chang Keun Lee ),유빈 ( Bin Yoo ) 대한류마티스학회 2010 대한류마티스학회지 Vol.17 No.3
Renal involvement is one of the extra-articular manifestations found in patients with rheumatoid arthritis (RA). Membranous glomerulonephopathy, membranoproliferative glomeruonophritis, secondary amyloidosis, and focal segmental glomerulosclerosis are reported as pathologic diagnoses of renal involvement. However, reports of renal involvement in patients with RA and antineutrophil cytoplasmic autoantibody (ANCA)-associated pauci-immune glomerulonephritis are rare. Recently, we experienced two patients with RA who developed azotemia and were finally diagnosed with ANCA-associated pauci-immune glomerulonephritis. Because of the rarity of these cases, we report two cases in patients with RA with a literature review.
Mun, μ Kyeom,Ho, Lee Won,Park, Jin Woo,San Kim, Doo,Yeom, Geun Young,Kim, Dong Woo American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.11
<P>Nanoparticles in a solution can be modified by various methods including wet treatment, UV light treatment, and plasma treatment for the functionalization of the nanoparticles. Especially, for the plasma treatment of nanoparticles in a solution, hydrophilic treatment is generally carried out by forming -OH in the solution while the plasma treatment system is located at the outside of the nanoparticle solution. In this study, using a He/SF6 atmospheric plasma jet (APPJ) sources located outside and inserted in the IPA solution with carbon black nanoparticles, carbon black nanoparticles were modified to improve hydrophobic properties. By inserting the plasma jet tip in the solution, the carbon black nanoparticles were more easily modified compared the plasma jet located outside of the solution. After the He/SF6 plasma treatment of carbon black nanoparticles with the APPJ in the solution, the contact angle of the sprayed-coated carbon black was increased from similar to 30 to similar to 140 degrees while no significant change of contact angle was observed for the carbon black nanoparticles treated by the APPJ located outside of the solution. After the He/SF6 plasma treatment, fluorine percentage of similar to 7.97% in the carbon black was observed without noticeable thickness change of carbon black nanoparticles. It is believed that, the fluorine radicals dissolved in the solution form C-F (x) bonding on the carbon black surface and increase the hydrophobicity significantly. This technique can be applied in modifying the surface properties of various other particles in solution.</P>
축산물 및 가공 : 김치에서 분리한 Lactobacillus plantarum LHB55의 항균성과 요구르트 제조 적합성 연구
이승규 ( Seung Gyu Lee ),이연정 ( Yeon Jung Lee ),김민경 ( Min Kyung Kim ),한기성 ( Ki Sung Han ),정석근 ( Seok Geun Jeong ),오미화 ( Mi Hwa Oh ),장애라 ( Ae Ra Jang ),김동훈 ( Dong Hun Kim ),배인휴 ( In Hyu Bae ),함준상 ( Jun San 한국동물자원과학회 ( 구 한국축산학회 ) 2010 한국축산학회지 Vol.52 No.2
Nanoparticles Synthesis and Modification using Solution Plasma Process
Mun, Mu Kyeom,Lee, Won Oh,Park, Jin Woo,Kim, Doo San,Yeom, Geun Young,Kim, Dong Woo The Korean Vacuum Society 2017 Applied Science and Convergence Technology Vol.26 No.6
Across the most industry, the demand for nanoparticles is increasing. Therefore, many studies have been carried out to synthesize nanoparticles using various methods. The aim of this paper is to introduce an industry-applicable as well as financially and environmentally effective solution plasma process. The solution plasma process involves fewer chemicals than the traditional kit, and can be used to replace many of the chemical agents employed in previous synthesis of nanoparticles into plasma. In this study, this process is compared to the wet-reaction process that has thus far been widely used in the most industry. Furthermore, the solution plasma process has been classified into four different types (in-solution, out of solution, direct type, and remote type), according to its plasma occurrence position and plasma types. Thus, the source of radicals, nanoparticle synthesis, and modification methods are explained for each design. Lastly, unlike nanoparticles with hydrophilic functional groups that are made inside the solution, a nanoparticle synthesis and modification method to create a hydrophobic functional group is also proposed.