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LIGA-like 공정을 이용한 마이크로 부품 복제용 Ni과 Ni-W 금형 제조 및 특성
황완식,박준식,강영철,조진우,박순섭,이인규,강성군,Hwang, W.S.,Park, J.S.,Kang, Y.C.,Cho, J.W.,Park, S.S.,Lee, I.G.,Kang, S.G. 한국재료학회 2003 한국재료학회지 Vol.13 No.1
Electroplated Ni and Ni-W micro-molds using LIGA-like process for replication of micro-components such as microfluidic parts and micro optical parts have been investigated. In general, it is hard to produce micro-parts using conventional mechanical processes. Micro-mold formed by LIGA-like process could fabricate micro-parts with high aspect ratio. In this paper, fabrication and properties of electroplated Ni molds with varying applied current types as well as those of Ni-W molds were investigated. Ni molds fabricated under pulse-reverse current showed the highest hardness value of about 160 Hv. Ni-W molds showed the hardness of about 500 Hv which was much harder than that of Ni electroplated molds. The above results suggested that high quality micro-molds could be fabricated by using Ni electroplating of pulse-reverse type for core molds and sequential Ni-W alloys coating.
Kim, H.H.,Matthijnssens, J.,Kim, H.J.,Kwon, H.J.,Park, J.G.,Son, K.Y.,Ryu, E.H.,Kim, D.S.,Lee, W.S.,Kang, M.I.,Yang, D.K.,Hyun, B.H.,Park, S.I.,Park, S.J.,Cho, K.O. Elsevier Science 2012 INFECTION GENETICS AND EVOLUTION Vol.12 No.7
Group A rotaviruses (RVAs) are agents causing severe gastroenteritis in infants and young animals. G9 RVA strains are believed to have originated from pigs. However, this genotype has emerged as the fifth major human RVA genotype worldwide. To better understand the relationship between human and porcine RVA strains, complete RVA genome data are needed. For human RVA strains, the number of complete genome data have grown exponentially. However, there is still a lack of complete genome data on porcine RVA strains. Recently, G9 RVA strains have been identified as the third most important genotype in diarrheic pigs in South Korea in combinations with P[7] and P[23]. This study is the first report on complete genome analyses of 1 G9P[7] and 3 G9P[23] porcine RVA strains, resulting in the following genotype constellation: G9-P[7]/P[23]-I5-R1-C1-M1-A8-N1-T1-E1-H1. By comparisons of these genotype constellations, it was revealed that the Korean G9P[7] and G9P[23] RVA strains possessed a typical porcine RVA backbone, similar to other known porcine RVA strains. However, detailed phylogenetic analyses revealed the presence of intra-genotype reassortments among porcine RVA strains in South Korea. Thus, our data provide genetic information of G9 RVA strains increasingly detected in both humans and pigs, and will help to establish the role of pigs as a source or reservoir for novel human RVA strains.
High-performance liquid chromatography method development for the quality control of Ginkgonis Semen
Le, V.N.H.,Lee, W.,Kim, Y.H.,Chae, G.H.,Chin, Y.W.,Kim, K.T.,Kang, J.S. Elsevier ; King Saud University 2017 Arabian Journal of Chemistry Vol.10 No.6
<P>Ginkgonis Semen (GS) is the seed of Ginkgo biloba Linne and a valuable material for herbal medicines and functional foods in China, Japan and Korea. The main bio-compounds of GS are GA, GB and GC like the leaves. There are many studies for the analysis of ginkgolides in the leaves or leaves extract of G. biloba because the leaves extract is a valuable material in pharmaceutical industries. However, there is no efficient analytical method for the quality control of GS based on the quantitation of ginkgolides because of matrix effect induced by different chemical composition. So, there are no content criteria of GS in Pharmacopoeia of Korea, Japan and China until now. This study aimed to develop HPLC method using ginkgolides based on the quantitation of GA, GB and GC for the quality control of GS with the optimization of sample preparation to enhance the analytical sensitivity and reproducibility. At first, defatting process using petroleum ether and liquid-liquid extraction were applied for sample preparation to remove matrix effect. The HPLC-ELSD method was developed with the mobile phase of a 0.5% aqueous acetic acid and methanol-acetonitrile solution (1: 1 ratio) under gradient conditions. GA, GB and GC contents in GS were different between Korea and China. The mean quantity of Korean samples was 4.85 +/- 2.33 lg/g GA, 48.38 +/- 5.10 lg/g GB, and 37.83 +/- 7.64 lg/g GC. Those contents of Chinese samples were higher than Korean samples as 9.39 +/- 2.51 lg/g GA, 123.59 +/- 26.24 lg/g GB and 53.39 +/- 4.97 lg/g GC. It indicated that the discrimination of GS between Korea and China could be achieved by marker compound contents. Furthermore, the geographical discrimination of GS between Korea and China was confirmed by PCA using the quantitative data of marker compounds. By statistical analysis, the calculated content criteria of GS by regression method were 2.35 lg/g of GA, 29.20 lg/g of GB, and 27.75 lg/g of GC, based on dry weight. Thus, our HPLC method shows potential toward the development of a universal quality control methodology to quantify GS quality and origin. (C) 2016 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University.</P>
석진규(J.K. Seok),강성관(S.K. Kang),송웅협(W.H. Song),조원우(W.W. Jo),노의철(E.C. Nho),김인동(I.D. Kim),전태원(T.W. Chun),김홍근(H.G. Kim) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
This paper deals with a welding time for a spot welding system. Conventional welding machine adopts several tens of switching devices connected in parallel to obtain a short welding time. This paper analyzed a welding system consisting with 4 IGBT switchs for a full-bridge inverter and conventional 60 [Hz] transformer. The simulation and experimental results show that the welding time can be minimized to 5 [ms] with the proposed scheme.
홍원표(W.P. Hong),강은구(E.G. Kang),이석우(S.W. Lee),최헌종(H.Z. Choi) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Recently, linear motion system has been required more smaller minimum resolution and more longer stroke for LCD and semi-industry product manufacturing applications. And also the operational environment like vacuum and clean room etc. have been considered as the design and manufacturing limitation. Our research target is the development of nano stage of 200㎜ strokes and 30㎚ resolutions. The stage have very tightly limited the features of high vacuum compatibility and non electric field. Therefore these limitations make the difficulty in somethings such as selections of materials, considerations of thermal effect, and electric field effect etc. In this paper, we suggest the dual servo mechanism to achieve the nano resolution in the ranges of about 200㎜ and to apply the FIB system. Finally, we give the conclusions on the performance test results of the nano stage.
이중 충격 발생 기능을 갖는 대형 고중량 충격시험장치의 동력학적 설계
강민식(M. S. Kang),설창원(C. W. Shul),김태형(T. H. Kim),양명석(M. S. Yang),송원길(W. G. Song),이규섭(G. S. Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Naval shipboard components encounter mechanical shock from a variety of sources. Components must be designed and tested accordingly to ensure reliability under possible shock pulses. This study concerns on dynamic design of a large and heavy dual shock generation system that will be used for reliability test of naval shipboard components. This is required to generate specific shock time history. Especially, the desired shock consists of a very high amplitude and very short period half-sine shock followed by an exponentially decaying harmonic shock of relatively longer period. Base on analysis of the dynamic characteristics of the given shock history, we proposed a sequential design procedure to determine spring and damping coefficients of the generation system. Feasibility of the proposed method was verified along with some simulation results.