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황상연 ( Hwang Sangyeon ) 경남대학교 산업경영연구소 2018 지역산업연구 Vol.41 No.2
본고에서는 1999-2013년을 분석기간으로 인천 및 15개 광역지자체의 제조업 부가가치기준 노동생산성 데이터에 변이할당분석 방법론을 적용하여 14개 제조업 중분류와 52개 제조업 소분류로 나누어 노동생산성의 변화를 산업 내 성장효과와 구조적 효과로 분해하였다. 분석 결과 인천의 전반적인 노동생산성 정체현상이 전국 평균이나 서울과 경기도 등 수도권 내다른 지역보다 심각한 것으로 나타났다. 특히 최근 금융위기 이후 기간(2009-2013년) 중 인천의 노동생산성 증가양상은 15개 지자체 중에서도 매우 낮은 수준으로 나타났으며 노동생산성 개선은 산업구조 변화에 의한 영향보다 개별산업 내 생산성 성장에 의해 주도된 것으로 나타났다. 높은 노동생산성을 경험하고 있는 타 지역에 비해 인천은 노동생산성이 높은 산업을 중심으로 산업구조가 효과적으로 재편되지는 못한 것으로 판단된다. 한편, 금융위기 이후 구조적 효과는 음(-)의 값을 보여 산업구조의 변화가 오히려 인천시 제조업 전체의 노동생산성부진의 원인일 수 있음을 보여준다. 다만, 제조업 산업 중분류 기준의 변이할당 분석결과, 전자부품 및 컴퓨터, 영상 음향 및 통신장비 제조업, 전기장비 제조업, 기타 기계 및 장비 제조업, 그리고 자동차 및 트레일러 제조업 등 4대 산업이 인천의 제조업 노동생산성 증대에 크게 기여하고 있어 이들 산업의 전략적인 육성을 고민할 필요가 있는 것으로 나타났다. 지역 산업정책으로써 매력적인 미래 유망산업의 발굴 및 육성 무시할 수 없는 과제이겠지만, 높은 생산성을 경험하고 있는 기존 산업중심의 산업구조 재편을 통해 인천 지역산업의 경쟁력을 제고할 수 있는 정책대안을 모색할 필요가 있다고 판단된다. In this paper, we perform a shift-share analysis on Incheon’s manufacturing labor productivity from 1999 to 2013 to investigate changes in industrial competitiveness in the region’s manufacturing sector. Implementing a static shift-share analysis, the paper decomposes value-added based labor productivity growth into a within-industry effect, a structural change level effect, and a structural change growth effect. The results indicate that the manufacturing labor productivity growth of Incheon region is weaker than the other regions in Korea. Especially, the weak-growth characteristic is strengthened in the post Subprime Crisis. Overall, the main driver of the manufacturing labor productivity of Incheon is the within-industry effect. The contribution of the structural change growth effect to the overall manufacturing labor productivity is limited and even negative for the post Subprime crisis period. This result shows that there exists productivity-detracting structural change with employment moving towards industries with weak labor productivity growth recently. Manufacturing sectors such as electronic components and computer, electrical equipment, other machinery and equipment, and motor vehicles, trailers and semi-trailers positively contribute to Incheon’s overall manufacturing labor productivity growth. However, food products, and chemicals and chemical products industries negatively affect the region’s labor productivity growth. The findings in this paper imply that the industrial structure of Incheon region should be reformed so that it moves toward the productivity-enhancing structure by increasing employment capacity in relatively high labor-productivity industries.
황상연(Sangyeon Hwang),유지호,좌승희 경기연구원 2008 경기개발연구원 기본연구 Vol.2008 No.11
This study attempts to develop the GyeongGi-do coincident economic indicator. We consider two different types of a regional coincident economic indicator. One is a NBER-type composite index and the other is a Stock-Watson-type index which is based on the dynamic single factor model. Especially, we discover various difficulties in determining the reference business cycles of GyeongGi-do regional economy and possible solutions for them. In order to determine the components of indicators, we consider cross-correlation coefficients, principal component analysis, and the analysis of turning points on the specific cycles of relevant variables. We derive three main NBER-type coincident indicators by time spans and different groups of variables included. In addition, we calculate a Stock-Watson-type coincident indicator including only four main economic variables. We show that the most important variable reflecting the economic condition of GyeongGi-do is the 'Producer's Shipment Index'. To investigate differences and similarities of the two different types of the indicator, we analyse the characteristics of turning points as well as cyclical components. Most of time, two different types of the indicator produce very similar results. According to the indicators we create, the business cycles of GyeongGi-do regional economy have both shorter expansion and contraction phases compared with the national level. This finding is clearer in the post-Asian Currency Crisis period than before. One of the possible reasons for this phenomenon is GyeongGi-do economy's heavy dependence on IT industry. In addition, the economic shocks frequently occuring in 2000s such as the global IT bubble-burst and national plastic bubble-burst are likely to have severe effects on the business cycles of GyeongGi-do economy. This study concludes that the support of GyeongGi-do provincial government is very necessary to develop the result of this research further and apply the outcomes in the real world.
황상연(Sangyeon Hwang),성백훈(Baekhoon Seong),변도영(Doyoung Byun) 한국가시화정보학회 2014 한국가시화정보학회지 Vol.12 No.2
Conventional electrospray and air spray methods have the vulnerabilities of limited flow rate (throughput) and droplet size, respectively. Since high throughput with uniform size of droplet is required for various applications, an improved technique should be adopted. Here, we report a combined system of an air pressure and an electric field and evaluate the atomization performance of it. The air flow allowed applying high flow rate range and the electric field reinforced the atomization process to generate fine droplets. A correlation between two forces was investigated by comparing the droplet produced by each method. The atomized droplets were measured and visualized by image processing and a particle image velocimetry (PIV). The quantitative results were achieved from the parametric space and the effect of both forces was analyzed. The motion of charged droplets followed the outer electric field rather than the complex vortex in the shear layer so that the droplets accelerated directly toward the grounded collector.
Hwang, Taehyun,Yun, Alan Jiwan,Kim, Jinhyun,Cho, Duckhyung,Kim, Sangyeon,Hong, Seunghun,Park, Byungwoo American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.7
<P>Herein, underlying factors for enabling efficient and stable performance of perovskite solar cells are studied through nanostructural controls of organic-inorganic halide perovskites. Namely, MAPbI<SUB>3</SUB>, (FA<SUB>0.83</SUB>MA<SUB>0.17</SUB>)Pb(I<SUB>0.83</SUB>Br<SUB>0.17</SUB>)<SUB>3</SUB>, and (Cs<SUB>0.10</SUB>FA<SUB>0.75</SUB>MA<SUB>0.15</SUB>)Pb(I<SUB>0.85</SUB>Br<SUB>0.15</SUB>)<SUB>3</SUB> perovskites (abbreviated as MA, FAMA, and CsFAMA, respectively) are examined with a grain growth control through thermal annealing. FAMA- and CsFAMA-based cells result in stable photovoltaic performance, while MA cells are sensitively dependent on the perovskite grain size dominated by annealing time. Micro-/nanoscopic features are comprehensively analyzed to unravel the origin that is directly correlated to the cell performance with the applications of electronic-trap characterizations such as photoconductive noise microscopy and capacitance analyses. It is revealed that CsFAMA has a lower trap density compared to MA and FAMA through the analyses of 1/<I>f</I> noises and trapping/detrapping capacitances. Also, an open-circuit voltage (<I>V</I><SUB>oc</SUB>) change is correlated to the variation of trap states during the shelf-life test: FAMA and CsFAMA cells with the negligible change of <I>V</I><SUB>oc</SUB> over weeks exhibit trap states shifting toward the band edge, although the power-conversion efficiencies are clearly reduced. The origins that critically affect the solar cell performance through the characterizations of shallow/deep traps with additional mobile defects in the perovskite and interfaces are discussed.</P> [FIG OMISSION]</BR>