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고제이(Jayee Ko),이우진(Woojin Lee) 한국재정학회(구 한국재정·공공경제학회) 2011 재정학연구 Vol.4 No.2
이 논문은 실제 관찰된 불평등을 개인이 직면한 환경의 불평등에 기인한 부분과 개인의 노력의 차이에 의한 부분으로 분해하는 방법을 제안한다. 그리고 이 방법을 노동패널 제 7차조사-10차조사까지의 자료에 나타난 30-55세의 남성 가구주로 구성된 데이터에 적용하여 보았다. 분석대상이 되는 기간은 2003-2006년이다. 우리는 수많은 환경변수들 중 아버지의 학력이라는 하나의 변수만을 고려하여 환경이 한국사회의 교육불평등과 소득불평등에 미치는 영향을 다양한 방식으로 추계하여 보았다. (아버지의 학력 이외의 다른 요소들에 의한 불평등은 모두 아들세대의 노력의 차이에 의한 것이라고 간주하였다.) 아들세대의 학력불평등 중 16%~59%정도가 아버지의 학력이라는 환경의 불평등에 의한 부분으로 계산되었다. 그리고 (노동공급의 탄력성이 0.06이라 가정했을 때) 임금율 불평등의 약 2%~12%와 소득불평등의 약 2%~12%정도가 환경의 불평등에 기인한 것이었다. The present paper proposes a method to decompose the observed socio-economic inequality into the part due to unequal opportunities and the part due to differential exercise of individual effort. The proposed method is applied to the data set constructed from the Korea Labor and Income Panel Studies for the period of 2003-2006, consisting of individuals who are male heads of household 30-55 years old. Among the many circumstance variables, which are beyond the control of individuals, we chose only one variable: father’s level of education. We provide a range of estimates of the importance of this circumstance variable in accounting for education and income inequality in one of the East Asian miracle countries. Father’s education is found to account for between 16 and 59 percent of education inequality, between 2 and 12% of wage inequality (when the elasticity of labor supply is assumed to be equal to 0.06) and between 2 and 12% of income inequality under the same assumption.
Dynamic Simulation and Analysis of the Space Shuttle Main Engine with Artificially Injected Faults
Jihyoung Cha,Chulsu Ha,Jaye Koo,Sangho Ko 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4
Securing the safety and the reliability of liquid-propellant rocket engines (LREs) for space vehicles is indispensable as engines consist of many complex components and operate under extremely high energy-dense conditions. Thus, health monitoring has become a mandatory requirement, especially for the reusable LREs that are currently being developed. In this context, a dynamic simulation program based on MATLAB/Simulink was developed in the current research on the Space Shuttle Main Engine (SSME), a partly reusable engine. Then, a series of fault simulations using this program was conducted: at a steady state operating condition (104% Rated Propulsion Level), various simulated fault conditions were artificially injected into the simulation models for the five major valves, the pumps, and the turbines of the SSME. The consequent effects due to each fault were analyzed based on the time responses of the major parameters of the engine. It is believed that this research topic is an essential pre-step for the development of fault detection and diagnosis algorithms for reusable engines in the future.
Dynamic Simulation and Analysis of the Space Shuttle Main Engine with Artificially Injected Faults
Cha, Jihyoung,Ha, Chulsu,Koo, Jaye,Ko, Sangho The Korean Society for Aeronautical and Space Scie 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4
Securing the safety and the reliability of liquid-propellant rocket engines (LREs) for space vehicles is indispensable as engines consist of many complex components and operate under extremely high energy-dense conditions. Thus, health monitoring has become a mandatory requirement, especially for the reusable LREs that are currently being developed. In this context, a dynamic simulation program based on MATLAB/Simulink was developed in the current research on the Space Shuttle Main Engine (SSME), a partly reusable engine. Then, a series of fault simulations using this program was conducted: at a steady state operating condition (104% Rated Propulsion Level), various simulated fault conditions were artificially injected into the simulation models for the five major valves, the pumps, and the turbines of the SSME. The consequent effects due to each fault were analyzed based on the time responses of the major parameters of the engine. It is believed that this research topic is an essential pre-step for the development of fault detection and diagnosis algorithms for reusable engines in the future.
Rijke 튜브의 열음향학적 불안정 현상의 시스템 식별을 위한 실험 및 데이터 분석
나선화(Seonhwa Na),고상호(Sangho Ko),구자예(Jaye Koo) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
열음향학적 불안정성의 동역학적 저차 모델링 기법 개발을 위해 전기적으로 가열되는 Rijke 튜브 실험 장치를 구성하고, 불안정성으로 인해 발생되는 튜브 내의 압력 진동을 측정하였다. 측정된 데이터로부터 압력 신호의 주파수 스펙트럼을 분석한 결과 3개의 주요한 진동모드를 관측할 수 있었으며 특히 첫 번째 모드 주파수는 단순한 열음햑학적 해석 결과와도 거의 일치하는 것을 확인하였다. 이러한 실험 자료와 데이터 분석을 바탕으로 추후 열음향학적 불안정현상의 저차 모델링을 수행할 예정이다. For the purpose of developing a modeling technique for reduced-order dynamics of thermoacoustic instability, we constructed an electrically heated Rijke tube and measured the pressure oscillation inside the tube. Analysing the measured pressure data showed that the instability generated three major oscillation modes, among which the first mode frequency quite well matches the result from a rough acoustic analysis. As a continuing research, a data-based modeling technique for the thermoacoustic instability will be developed in the near future.