http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
영상분석을 이용한 U-Turn허용구간에서의 교통상충 판단기준 정립 및 적용
김응철,오주택(O, Ju-Taek),정동우(Jeong, Dong-U) 대한교통학회 2008 대한교통학회 학술대회지 Vol.58 No.-
현재 전국의 주요 교차로에서 현시를 줄여 교통소통을 원활히 하는 방법으로 대향차로가 3차로 이상의 도로일 경우 U-Turn허용구간을 설치하여 운행하는 방법을 사용하고 있다. U-Turn허용구간의 증가로 인하여 U-Turn차량들로 인한 사고 및 상충의 수도 함께 증가하고 있으나 사고 자료를 이용한 안전도 판단은 다년도 사고자료 취득의 어려움과 경미한 사고들의 부재로 인하여 분석에 어려움이 있다. 이러한 사고 자료를 이용한 안전도 판단의 어려움을 대체하는 방법으로 상충을 이용한 방법이 연구되어 사용되고 있으나 U-Turn허용구간에서 사용되는 구체적인 상충판단기준의 정립이 미흡한 상황이다.
논벼 무경운재배의 온실가스 감축효과를 고려한 경제성 분석
정우석(U Seok Jeong),김성섭(Seong sup Kim),서상택(Sang taek Seo),김숙진(Sook jin Kim) 한국농식품정책학회 2017 농업경영정책연구 Vol.44 No.4
This study performed an economic analysis for no-till practice of paddy rice compared with traditional till practice of paddy rice. The effect of reducing greenhouse gas (GHG) emissions from soil and agricultural machinery was added to economic outcome of no-till practice. Experimental data of GHG and yield by practices were obtained from National Institute of Crop Science and partial budgeting method was adopted for the analysis. Results showed that GHG reduction from no-till practice was very large in soil compared with agricultural machinery. The economic outcome of no-till practice was larger than that of traditional till practice even when it did not contain GHG reduction effect. In addition, no-till practice showed positive economic performance regardless of the ownership for agricultural machinery. The results of this study are expected to be highly useful as legitimacy of policy support for no-till paddy rice practice.
우운택,U, Un-Taek 한국광학기기산업협회 2016 光學世界 Vol.163 No.-
가상현실 및 증강현실 기술이 미래 지식서비스 산업으로 각광 받으면서 가상/증강현실 시대를 대비하는 IT 기업들이 증가하고 있다. 본 글에서는 증강현실 분야의 현황, 증강현실의 기본 개념 및 정의, 미래발전 방향으로서의 증강휴먼, 증강휴먼 핵심기술 및 응용을 살펴보고 이를 통해 미래 전망을 도출하고자 한다.
유류가격의 변동이 농업부문의 물가에 미치는 파급영향 분석
정우석 ( U Seok Jeong ),서상택 ( Sang Taek Seo ),한두봉 ( Doo Bong Han ) 한국축산경영학회 2013 농업경영정책연구 Vol.40 No.1
This study was performed to analyze the effect of changes in oil price on the price level of agricultural products in Korea. For the study, Input- Output model with basic industry sectors produced by year 2009 was used. The model with year 2009 was incorporated with household consumption sector and/or was compared with the model with year 2003 for further analysis. Two scenarios with ten percent change and historical change of oil price were analyzed. Results show that price effects of agricultural products caused by changes in oil price were highest in diesel followed by gasoline and kerosene. These effects were increased with the incorporation of household consumption. These effects were higher in year two thousand five than in year two thousand nine in both diesel and kerosene. The opposite result, however, was obtained in gasoline.
실물옵션을 이용한 지열에너지 시스템의 투자 임계점 분석 - 파프리카 농가를 중심으로 -
정우석 ( U Seok Jeong ),서상택 ( Sang Taek Seo ) 한국축산경영학회 2013 농업경영정책연구 Vol.40 No.1
This study analyzes the entry threshold of geothermal heat pump system with paprika farming, where the geothermal heat pump system is being disseminated to replace traditional fossil fuel energy system. The geothermal heat pump system lowers the energy cost considerably and alleviates the pressure of the increase of fossil fuel cost that is severely affected by international energy price. For the investment analysis, we adopt real options approach (RO) instead of net present value approach (NPV), where RO applies the concept of financial option to real assets. The results show that the entry threshold with RO is a lot higher compared to that obtained by NPV. This implies that farmers with paprika farming need to consider the irreversibility and uncertainty in the investment analysis. Sensitivity analysis shows the entry threshold is sensitive to the change in parameters used in this study, such as yield, fuel cost, and investment cost. First of all, with the fifty percent subsidy of investment cost, which is currently available, the entry threshold guarantees the profitability of the investment with geothermal heat pump system. This result is robust to the no subsidy of investment cost, too. The entry threshold, however, is sensitive to the change in fuel cost and quantity increased under geothermal heat pump system.
Real Hypersurfaces in Complex Space Forms with Reeb Flow Symmetric Structure Jacobi Operator
Cho, Jong Taek,Ki, U-Hang Canadian Mathematical Society 2008 Canadian mathematical bulletin Vol.51 No.3
<B>Abstract</B><P>Real hypersurfaces in a complex space form whose structure Jacobi operator is symmetric along the Reeb flow are studied. Among them, homogeneous real hypersurfaces of type (<I>A</I>) in a complex projective or hyperbolic space are characterized as those whose structure Jacobi operator commutes with the shape operator.</P>