특허권 강화와 기술혁신: EU국가를 중심으로

서환주 ( Hwan Joo Seo ) 한국EU학회 2004 EU학연구 Vol.9 No.2

미국의 서비스화진전에 대한 연구

서환주 ( Hwan Joo Seo ),이영수 ( Young Soo Lee ) 한국국제경제학회 2007 국제경제연구 Vol.13 No.3

MASW와 HVSR 방법을 활용한 4기 단층 물리탐사

서환우(Hwanwoo Seo),이준영(Junyeong Lee),안성노(Seongnoh Ahn),김병민(Byungmin Kim) 대한지질학회 2023 대한지질학회 학술대회 Vol.2023 No.11

공간통계기법을 이용한 생태계 관리지역의 산림축적 추정

서환석 ( Hwan Seok Seo ),박정묵 ( Jeong Mook Park ),김은숙 ( Eun Sook Kim ),이정수 ( Jung Soo Lee ) 한국지리정보학회 2015 한국지리정보학회지 Vol.18 No.2

This study aims to estimate the forest volumes of the upper region of Nam-Han River in ecosystem zoning by forest types and age classes, and to suggest the optimal estimation method through the comparison of the standard errors according to the spatial unit. In the estimation of forest volumes, we used both of direct estimation, which uses sample plots of the target area only, and synthetic estimation, which includes sample plots of the expanded areas as well as those of the target area. As for the spatial expansion, we applied four standards for synthetic estimator: Mountainous zone, Neighbor ecosystem region, Gangwon province, and Buffer zone. The results show that average forest volume per ha, calculated by direct estimation, was 143.5㎥/ha, while that by synthetic estimation with each standard, was estimated at 146.9㎥/ha by Gangwon province, 144.8㎥/ha by Buffer zone, 139.8㎥/ha by Neighbor ecosystem region, and 138.6㎥/ha by Mountainous zone, respectively. The standard errors of direct estimation was 1.79㎥/ha, while those of synthetic estimation showed not a great difference among the errors. Meanwhile, considering the standard errors by forest type, the lowest was ±2.3㎥/ha of broad-leaved forest, followed by ±3.3㎥/ha of mixed forest, and ±4.8㎥/h of coniferous forest.

서비스산업의 국제경쟁력에서 기술능력의 역할

서환주 ( Hwan Joo Seo ),이영수 ( Young Soo Lee ) 한국EU학회 2011 EU학연구 Vol.16 No.1

This study investigates the role of technological competence in the international competitiveness of OECD services using panel GMM estimation. Relative prices, economies of scale, diffusion of IT, human capital, R&D expenditure and investment in capital formation are introduced as explanatory variables in regression for 28 OECD countries over 2000∼2007. Some of major findings from the study can be summarized as follows. First, technological competence measured by R&D expenditure and diffusion rate of IT plays important role in the international competitiveness of services. R&D expenditure has a positive and significant impact on international competitiveness in transport, telecommunication and business services, while IT provides favorable condition to build international competitiveness in transport, finance and insurance and business services. Second, it is also shown that other variables including relative prices, human capital and investment in machine and equipment contribute to the amelioration of international competitiveness. Third, the empirical results confirm the great heterogeneity within service activities. Influence of technological competence on international competitiveness is different depending on the services.

정보기술 ( IT ) 투자와 성장격차 간의 동태적 관계 : OECD 가입국을 중심으로

서환주(Hwan Joo Seo),이영수(Young Soo Lee) 한국국제경제학회 2000 국제경제연구 Vol.6 No.3

본 연구는 1990년대 OECD 가입국을 대상으로 IT투자가 국가 간 성장격차를 확대시키고 있는지 여부와 IT투자와 생산성 향상 간에 누적적인 관계가 존재하는가에 대해 모형을 설정한 후 실증분석하였다. 측약방정식과 연립방정식을 이용하여 OECD 가입국에서 IT투자의 경제적 효과를 추정한 결과 다음과 같은 몇 가지 사실을 얻을 수 있었다. 첫째, 정보자본 축적을 급속하게 증가시키고 있는 국가들은 OECD 평균에 비하여 빠르게 노동 생산성이 향상되는 것으로 나타났다. 둘째, 비정보자본도 정보자본과 유사한 경제적 효과를 가져오나, 효과의 크기에서는 비정보자본이 정보자본에 비하여 크다는 사실을 확인할 수 있었다. 셋째, 상대적으로 생산성수준이 뒤떨어진 국가들은 해외에서 확산되는 지식을 활용하여 생산성격차를 줄여 나가고 있는 것을 알 수 있었다. 넷째, 생산성역설과는 달리 정보기술의 확산 또는 투자는 OECD 가입국의 노동생산성을 향상시키는 것으로 나타났으며, 인적 자본 등 인프라스트럭처 구축이 잘 되어 있는 국가들의 경우 정보자본에 대한 투자가 활발하게 진행되고 있는 것으로 나타났다. 마지막으로 정보자본에 대한 투자와 생산성 향상 간에 누적적인 관계가 존재하는 것이 확인되었다.

세계화, 정보화, 서비스화, 금융화와 노동소득비율 간의 관계 -OECD 국가 자료를 이용한 분석-

서환주 ( Hwan Joo Seo ),허재준 ( Jai Joon Hur ) 한국EU학회 2010 EU학연구 Vol.15 No.1

Using OECD data of 26 countries, this paper analyzes the role of structural factors such as globalization, tertiarization, informatization and financialization, which are frequently thought to have influence on income inequality between labor and capital, in explaining the movement of labor share over 1995∼2007. The results show that globalization and financialization have a negative impact on labor income share, while tertiarization and informatization have a positive impact. We can deduce that tertiarization has been labor intensive and IT is labor-augmenting.

사면 경사도가 있는 뒷채움토와 지반특성을 고려한 역T형 옹벽의 지진시 취약도 평가

서환우(Seo, Hwanwoo),김병민(Kim, Byungmin),박두희(Park, Duhee) 대한토목학회 2021 대한토목학회논문집 Vol.41 No.5

옹벽 구조물은 철도, 도로, 원자력 발전소, 댐, 하천 시설 등 토압 저항을 통한 사면 붕괴방지에 활용된다. 동토압 산정 및 지진시 거동에 대한 특성을 파악하기 위해 많은 연구자들은 다양한 수치해석 프로그램(FLAC, PLAXIS, ABAQUS 등)을 활용하여 동적 하중에 대한 구조물과 지반의 비선형 거동을 분석하고 있다. 또한, 구조물의 지진에 대한 안전성을 확보하기 위해 지진취약도 곡선을 산정하여 확률론적 지진안전성 평가를 수행하고 있다. 본 연구에서는 수치해석프로그램 FLAC2D를 활용하여 뒷채움토의 사면 경사도가 있는 역T형 옹벽의 지진거동 특성을 파악하고, 옹벽 벽체의 상대적인 수평변위를 고려하여 지진취약도 평가를 수행하였다. 다양한 지진하중을 고려하기 위해 암반에서 계측된 7개의 지진파를 활용하여 각 지반특성 별(S2, S4) 비선형 지반응답해석을 수행하였고, 산정된 지진파의 크기를 5가지(0.1, 0.3, 0.5, 0.7, 0.9 g의 최대지반가속도)로 조정하였다. 본 연구에 활용된 수치해석 모델은 다른 수치해석결과와 실험결과, 주동토압 산정식을 활용하여 비교 검증하였다. 옹벽 높이에 대한 상대수평변위를 손상지수로 고려하여 옹벽의 손상상태를 결정하여 지진취약도 곡선을 산정하였다. 상대적으로 깊고 토층 평균전단파 속도가 느린 S4 지반에서 S2 지반보다 옹벽 벽체의 수평 변위에 대한 지진취약도가 크게 산정되었음을 확인하였다. Retaining walls have been used to prevent slope failure through resistance of earth pressure in railway, road, nuclear power plant, dam, and river infrastructure. To calculate dynamic earth pressure and determine the characteristics for seismic behavior, many researchers have analyzed the nonlinear response of ground and structure based on various numerical analyses (FLAC, PLAXIS, ABAQUS etc). In addition, seismic fragility evaluation is performed to ensure safety against earthquakes for structures. In this study, we used the FLAC2D program to understand the seismic response of the inverted T-type wall with a backfill slope, and evaluated seismic fragility based on relative horizontal displacements of the wall. Nonlinear site response analysis was performed for each site (S2 and S4) using the seven ground motions to calculate various seismic loadings reflecting site characteristics. The numerical model was validated based on other numerical models, experiment results, and generalized formula for dynamic active earth pressure. We also determined the damage state and damage index based on the height of retaining wall, and developed the seismic fragility curves. The damage probabilities of the retaining wall for the S4 site were computed to be larger than those for the S2 site.

ICT 확산과 국가간 성장격차 확대간의 상관관계 연구 / 90 년대 OECD 와 EU 국가를 중심으로

서환주(Hwan Joo Seo),정동진(Dong Jin Chung) 한국EU학회 2002 EU학연구 Vol.7 No.1

This paper, using catch-up model, verifies the dynamic relationship between ICT investment and economic growth and then examines whether this relationship enlarges the differences in the economic growth among OECD and EU countries in 90s. We find the following results: First we can find the divergence tendence in OECD countries in spite of the great acceleration of globalization in 90s. Second, those countries making a rapid progress in ICT capital formulation enhance labor productivity faster than US economy does and thus this might enlarge the disparity between countries according to the economic possibilities provided by IT investment. Lastly, EU Countries show relatively higher externality effects than OECD member countries and thus EU countries can reduce the growth gap using spillovers.

복지레짐의 국제비교분석: 평등과 효율성의 양립가능성을 중심으로

서환주 ( Hwan-joo Seo ) 한국EU학회 2017 EU학연구 Vol.22 No.1

In the 1970s, debate on Marshall's theory of social citizenship, the welfare state of the Beveridge Report, Keynesian economic policy and other theories forming the theoretical underpinning of Fordism and the welfare state after World War II gave way to discourse on new thinking, such as Okun’s Big Tradeoff, the trickle-down effect and the crisis of the welfare state. However, the global financial crisis of 2008 set in motion a shift in perspective on income inequality, which had previously seen such inequality as a natural outcome of economic growth. Contrary to the assumptions of the trickle-down theory, we find that the rising tide of growth does not float all boats and that economic growth does not naturally address the problem of income inequality. Rather, deepening income inequality threatens the stability of the system. The Nordic countries, which remain loyal to the welfare state tradition, have achieved economic performance comparable to Anglo-American countries and have done so without worsening income inequality. This contrasts with economic development in Anglo-American countries that have tolerated inequality to promote competitiveness and growth. Our conclusions demonstrate that the relationship between equality and efficiency need not be a tradeoff; it can also be complementary. Comparative studies by Esping-Andersen and Amable show that welfare systems can be compatible with other institutional systems in ways that ensure welfare, growth and income equality. In this paper, we classify developed economies into four models based on interaction between the welfare system, labor market, and education and training systems within each economy, and we formalize under what conditions equality and growth may coexist. This comparative analysis of growth regimes finds that achieving equal distribution requires social efforts through social compromise and dialogue, as well as through supporting institutional design, and that such efforts can simultaneously promote growth and economic equality.