http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Fabrication of a tungsten master stamp using self-ordered porous alumina
Choi, Jinsub,Park, Young-Bae,Scherer, Axel IOP Pub 2005 Nanotechnology Vol.16 No.9
<P>We describe the preparation of a tungsten pillar nanoimprint stamp without the use of lithography and etching techniques. Structures with heights of 15 nm were prepared on the basis of self-ordered porous alumina templates and this was followed by DC sputtering of tungsten. The stamp was successfully used to prepare an aluminium surface to obtain highly ordered porous anodic alumina films after a single anodization step. The preparation efficiency for highly ordered porous alumina was dramatically improved as compared to the more conventional two-step anodization–strip-anodization method, as a sacrificial layer with a thickness of a few hundred micrometres was not required. In addition, by fractal calculations, we have evaluated the degree of ordering of the asperities on the nanoimprint master stamp. </P>
최진섭(Jinsub Choi) 한국경제발전학회 2020 經濟發展硏究 Vol.26 No.3
본 논문은 대한민국 유입 외국인직접투자가 지역경제와 지방세수입에 미치는 영향을 실증적으로 분석하였다. 일반적으로 외국인직접투자가 지역경제와 지방세수입에 긍정적 영향을 미칠 것으로 여겨지지만, 기존 연구에서의 관련 논의가 충분치 못한 것으로 보인다. 따라서 이에 대한 실증적 검증의 필요성이 제기된다. 실증분석을 위해 2010년~2017년 시·도 패널자료를 이용한 일차 차분 GMM 모형을 추정하였다. 그 결과, 외국인직접투자가 GRDP에 정(+) 영향을 미친다는 결과를 얻을 수 있었다. 반면, 외국인직접투자가 지방세수입에 미치는 영향은 대체로 정(+)으로 추정되었으나 통제변수에 따라 통계적 유의성이 없어지기도 하였다. 따라서 지방세수입에 미치는 긍정적 영향에 대한 실증증거는 다소 제한적으로 보인다. This paper empirically investigates what effect foreign direct investment (FDI) has on local economies and local tax revenue in Korea. Although FDI inflows are generally expected to boost local economic performance and thereby increase local tax revenue, this topic has not been thoroughly studied in the empirical literature. Using panel data for Korean provinces (and province-equivalents) for the period of 2010-2017, I find significant evidence for the positive effect of FDI on GRDP. However, the evidence for the effect on local tax revenue is limited.
최원영(Wonyoung Choi),김문수(Moonsu Kim),유현석(Hyeonseok Yoo),송연균(Yeongyun Song),정용균(Yong-Gyun Jeong),최진섭(Jinsub Choi) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.6
The use of anti-corrosive oil (AC) is inevitable for production of industrial steels to prevent corrosion. The AC is degreased before application of steels, which crucially effects on final products, such as automobile, electricity etc. However, qualitative/quantitative evaluation of degreasing performance are steal insufficient. In this study, degreasing performance of anti-corrosive oil on steel have been studied through X-ray photon spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). Commercial automotive steels (AMS) are coated with 4 different anti-corrosive oils (namely AC1-AC4). In XPS, intensity of C1s peak remained after degreasing indirectly indicates incomplete degreasing. Thus, higher C1s peak intensity means less effective degreasing by degreasing agent. peak intensity of C1s peak shows opposite tendency of peak intensity of O1s. We found that EIS analysis is not applicable to mild steel (such as AMS1) due to corrosion during measurement. However, alloy steel can be fully analyzed by EIS and XPS depth profile.
Jinsub Kim,Seok Chan An,Yojong Choi,Tae Kuk Ko,Yong Chu IEEE 2017 IEEE transactions on applied superconductivity Vol.27 No.4
<P>A quench detection system for Korea Superconducting Tokamak Advanced Research (KSTAR) Poloidal Field (PF) coils is indispensable against the occurrence of a normal zone due to frequently variable current operation and an enormous amount of stored energy. The co-wound conductive strips and Wheatstone bridges have been adopted in KSTAR to detect abnormal voltage signal caused from quench. Those voltage detection methods have sufficient capability to detect quench occurrence, but additional cancelling out of mutual induction by adjacent coils would improve stability and reliability of quench detection system. A new voltage detection concept, using central difference averaging (CDA) and mutual inductance compensation (MIK) simultaneously, as an advanced technique to compensate the mutual inductive voltage, has been suggested and studied for this study. The CDA and MIK methods were practically adapted to the KSTAR PF 1 coil for the feasibility study. Test results show that the inductance matrix calculated by the FEM tool should be revised because of a revealed discrepancy between measured CDA voltage and calculated MIK voltage. In this study, the inductance matrix was revised by using the “Genetic algorithm” optimization method to reduce the discrepancy between CDA and MIK effectively. The adoption of the MIK revised inductance matrix was consistent with CDA voltage; mutual inductive voltage was expected to be successfully eliminated.</P>
Ko, Eunseong,Choi, Jinsub,Okamoto, Koichi,Tak, Yongsug,Lee, Jaeyoung WILEY‐VCH Verlag 2006 CHEMPHYSCHEM -WEINHEIM- Vol.7 No.7
<P><B>Abstract</B></P>10.1002/cphc.200600060.abs<P>Cu<SUB>2</SUB>O nanowires, mainly consisting of (100) and (200) polycrystalline structures with a length of 4 μm are prepared by electrochemical deposition using a porous alumina template. It is found that the optimized electrochemical conditions to prepare Cu<SUB>2</SUB>O nanowires are different from those for the formation of a bulk thin Cu<SUB>2</SUB>O layer since different pH values are found between the tip of the pores and the bulk, due to diffusion limits in porous alumina with an extremely high aspect ratio of 300. We point out that Cu<SUB>2</SUB>O (200), Cu<SUB>2</SUB>O (111), Cu, and co‐deposited alloys can be obtained under specific electrochemical conditions. In addition, the optical band gap of the prepared Cu<SUB>2</SUB>O nanowires with a length of 4 μm and a diameter of 200 nm is estimated to be 2.17 eV from photoluminescence measurements.</P>
Nickel oxalate nanostructures for supercapacitors
Jung, Insoo,Choi, Jinsub,Tak, Yongsug Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.29
<P>Herein, we describe a facile method to produce nickel oxalate nanostructures by chemical reaction of oxalic acid and a nickel foil in various organic solvents and water. Grass-like structures consisting of nickel oxalate are produced by the chemical reaction within 30 min for all solvents. Interestingly, nickel oxalate nanowires can be produced by the addition of a small amount of water in certain solvents. Annealing of nickel oxalate structures leads to formation of nickel oxide structures with a slight morphological change. Compositions of the nanostructures are investigated by TEM and FT-IR analyses. In addition, the supercapacitance of the nickel oxalate nanostructures is characterized, and the results show that they are superior to that of nickel oxide nanostructures.</P> <P>Graphic Abstract</P><P>The supercapacitance of the nickel oxalate structures, which are obtained by the immersion of nickel foils in organic solvents containing oxalic acid, is superior to that of the nickel oxide structures, which are produced by the annealing of the nickel oxalate structures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm00279h'> </P>