외국인직접투자의 지역경제 및 지방세수입 효과

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.

Research Trends in Doping Methods on TiO₂ Nanotube Arrays Prepared by Electrochemical Anodization

유현석,최진섭,Yoo, Hyeonseok,Choi, Jinsub The Korean Society of Industrial and Engineering C 2015 공업화학 Vol.26 No.2

Nanotubular $TiO_2$ prepared by electrochemical anodization has been significantly used for various applications due to high aspect ratio structures showing a high chemical stability. Morphological properties of nanotubular titanium oxide are easily tailored by adjusting types and compositions of electrolyte, pH value, applied voltage, temperature and anodization time. Since their catalytic properties can be enhanced by doping foreign elements into $TiO_2$, metal as well as non-metal elements are doped into $TiO_2$ nanotubes using different methods. For example, single anodization, thermal annealing, precipitation, and electrochemical deposition have been applied to simplify the doping process. In this review, anodization of Ti to produce $TiO_2$ and doping methods will be discussed in detail. 전기화학적 양극산화 기법으로 제조한 타이타늄 나노튜브는 타이타늄 특유의 강한 화학내구성 및 나노튜브의 높은 종횡비로 인하여 넓은 범위에 응용된 소재이다. 전해질의 구성 성분과 종류, pH, 전압, 온도 그리고 양극산화 시간이 타이타늄 나노튜브의 성상을 결정짓는 요소들이며 도핑을 통해 촉매능을 부여할 수 있다. 비금속 및 금속 원소 모두 도핑 가능하며 도핑 방법 역시 다양하다. 도핑 방법에는 합금 양극산화, 열처리법, 함침법, 전기도금법 등 다양한 방법들이 이용되며 점차 간단하고 빠른 도핑 방법을 찾는 방향으로 연구가 진행되고 있다. 본 총설에서는 타이타늄 나노튜브의 생성 원리와 상용된 제법들에 관하여 기술하고 도핑과 그 응용 및 최근의 도핑 연구 동향을 다루도록 하겠다.

탈지 정도에 대한 방청유-금속 계면의 영향성 평가

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.

저전압 PEO 양극산화 공정을 위한 Ti 전처리 조건의 최적화 연구

하동흔(Dongheun Ha),최진섭(Jinsub Choi) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.6

Plasma electrolyte oxidation (PEO) is a kind of anodization, in which a very high voltage or current is applied to a metal substrate in various electrolytes, allowing distinctly thick thickness of the oxide film with outstanding film properties, such as a good corrosion resistance, mechanical strength, thermal stability, and excellent adhesion to a substrate. Herein, we tried to find the optimal pretreatment conditions among commercially available solutions in order to produce PEO anodizing at relatively low voltage. We characterized the surface morphologies of the sample by scanning electron microscope (SEM), atomic force microscopy (AFM), and investigated color parameters of the pretreated surface of Ti by spectrophotometer.

흄드실리카로부터 제조된 실리카졸의 분산인자 상관성 연구

박민경,김훈,임형미,최진섭,김대성,Park, Min-Gyeong,Kim, Hun,Lim, Hyung Mi,Choi, Jinsub,Kim, Dae Sung 한국재료학회 2016 한국재료학회지 Vol.26 No.3

To study the dispersion factors of silica sol prepared from fumed silica powder, we prepared silica sol under an aqueous system using a batch type bead mill. The dispersion properties of silica sol have a close relationship to dispersion factors such as pH, milling time and speed, the size and amount of zirconia beads, the solid content of fumed silica, and the shape and diameter of the milling impellers. Especially, the silica particles in silica sol were found to show dispersion stability on a pH value above 7, due to the electrostatic repulsion between the particles having a high zeta potential value. The shape and diameter of the impellers installed in the bead mill for the dispersion of fumed silica was very important in reducing the particle size of the aggregated silica. The median particle size ($D_{50}$) of silica sol obtained after milling was also optimized according to the variation of the size and amount of the zirconia beads that were used as the grinding medium, and according to the solid content of fumed silica. The dispersion properties of silica sol were investigated using zeta potential, turbiscan, particle size analyzer, and transmission electron microscopy.

알루미늄 합금의 연속식 양극산화법으로 형성시킨 이중 산화막층의 특성

정나겸(Nagyeom Jeong),최진섭(Jinsub Choi) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.1

In this study, double-layered anodizing films were formed on Al 5052 and Al 6061 alloys consecutively first in sulfuric acid and then in oxalic acid, and hardness, withstand voltage, surface roughness and acid resistance of the anodizing films were compared with single-layered anodizing films in sulfuric acid and oxalic acid electrolytes. Hardness of the double-layered anodizing film decreased with increasing ratio of inner layer to outer layer for both Al 5052 and Al 6061 alloys, suggesting that outer anodizing film formed in sulfuric acid electrolyte is damaged during the second anodizing in oxalic acid electrolyte. Withstand voltage of the double-layered anodizing films increased with increasing the thickness ratio of inner layer to outer layer. Surface roughness of the double-layered anodizing films were comparable with that of single-layered anodizing film formed in sulfuric acid but higher than that of single layer anodizing film formed in oxalic acid electrolyte. In acid resistance test, all of the double-layered and single-layered anodizing films showed good acid resistance more than 3 h without any visible gas evolution, which is attributable to sealing of pores. Based on the experimental results obtained in this work, it is possible to design a double-layered anodizing film with cost-effectiveness and improved physical and electrical properties by combining two consecutive anodizing processes of sulfuric acid anodizing and oxalic acid anodizing methods.

양극산화를 사용한 TiO₂ 마이크로/나노 구조체 제조 및 리튬 이온 전지 음극재로의 응용 연구

김용태 ( Yong-tae Kim ),최진섭 ( Jinsub Choi ) 한국공업화학회 2021 공업화학 Vol.32 No.3

전기자동차(EV) 및 중대형 에너지 저장 장치(ESS)의 활용을 위한 차세대 에너지 저장 장치에 대한 요구가 증가함에 따라, 높은 출력 및 안정성 등의 특성을 갖는 리튬 이온 전지 개발이 시급한 과제로 떠오르고 있다. 리튬 이온 이차전지의 성능은 주로 전극 재료의 물리/화학적 특성에 의해 결정되는데, TiO₂는 우수한 안정성 및 높은 안정성, 친환경적 특성으로 인해 현재 상용화된 탄소계 음극재를 대체할 수 있는 물질로 높은 관심을 받고 있다. 특히, 양극산화를 통해 제조된 자기 정렬된 TiO₂ 마이크로 및 나노 구조는 차세대 리튬 이온 이차 전지의 유망한 음극 소재 물질로 많은 연구가 이루어지고 있다. 본 총설 논문에서는 양극산화를 통한 TiO₂ 나노 튜브 및 마이크로콘 구조 메커니즘 및 구조 발달에 영향을 미치는 인자에 대한 설명을 다루었다. 또한, TiO₂의 낮은 전기전도도 및 용량 한계를 극복하기 위한 TiO₂ 기반 복합체를 리튬 이온 이차 전지의 음극재로 활용한 연구를 소개하였다. With increasingly strict requirements for advanced energy storage devices in electric vehicles (EVs) and stationary energy storage systems (EES), the development of lithium-ion batteries (LIBs) with high power density and safety has become an urgent task. Because the performance of LIBs is determined primarily by the physicochemical characteristics of its electrode material, TiO₂, owing to its excellent stability, high safety levels, and environmentally friendly properties, has received significant attention as an alternative material for the replacement of commercial carbon-based anode materials. In particular, self-organized TiO₂ micro and nanostructures prepared by anodization have been intensively investigated as promising anode materials. In this review, the mechanism for the formation of anodic TiO₂ nanotubes and microcones and the parameters that influence their morphology are described. Furthermore, recent developments in anodic TiO₂-based composites as anode electrodes for LIBs to overcome the limitations of low conductivity and specific capacity are summarized.

에너지저장장치용 폐리튬이온배터리 성능 진단 및 복원 기술동향

이기영 ( Kiyoug Lee ),최진섭 ( Jinsub Choi ),이재영 ( Jaeyoung Lee ) 한국공업화학회 2019 공업화학 Vol.30 No.3

리튬이온배터리는 여러 에너지저장시스템 중 가장 관심을 받고 있는 장치이다. 특히, 분산형 전력공급원으로서의 신재생에너지 수요의 증가, 안정적인 전력의 수급, 전기자동차의 보급의 확대에 따라 에너지저장장치의 사용은 증가하고 있다. 최근, 에너지저장장치로서 리튬이온배터리의 사용량의 증가에 따른 폐리튬이온배터리의 재활용, 복원 기술은 사회, 경제적으로 중요한 연구분야이다. 본 총설에서는 최근 폐리튬이온배터리 성능진단, 재활용 또는 복원 기술과 발전가능성에 대하여 기술하고자 한다. Lithium-ion batteries are one of the most interesting devices in a number of energy storage systems. In particular, the usage of energy storage devices is increasing due to an increase in demand for renewable energy as a distributed power supply source, stable supply of electric power, and expansion of electric vehicles. Of late, the recycling and restoration technology of waste lithium ion batteries due to the increase in its usage amount as the energy storage system is a socially and economically important research field. In this review, we intend to describe the performance diagnosis, recycling or restoration technology of lithium ion battery and its potential development.

Layer-by-layer 기법을 통한 Cu₂(btc)₃-AAO 하이브리드 분리막의 제조

유현석(Hyeonseok Yoo),최진섭(Jinsub Choi) 한국표면공학회 2018 한국표면공학회지 Vol.51 No.1

The Cu₂(btc)₃ metal-organic frameworks (MOF) coated anodic aluminum oxide (AAO) membrane was successfully prepared by layer-by-layer technique using hand spray method. It was confirmed that the Cu₂(btc)₃ layer, which has the pore sized in 2-3 nm, on surface of AAO exhibited the polycrystalline thin film structure by XRD analysis. More than 100 repetitive spray cycles were required to obtain more robust and thick MOFs on AAO and it was possible to uniformly coat both the top and bottom surfaces of the AAO. It should be noted that the MOFs also could be coated on surface of pores resulting in reduce the size of pore from 52 nm to 32 nm.

물류단지 균형 배치를 위한 조세제도 개선 연구

김병관(KIM, Byungkwan),박지선(PARK, Jisun),최진섭(CHOI, Jinsub) 대한교통학회 2023 대한교통학회지 Vol.41 No.2