전후 이승만 정권의 기간산업 육성론

정진아 ( Chung Jin A ) 역사문제연구소 2009 역사문제연구 Vol.13 No.2

After the Korean war, the Syngman Rhee government intended to foster a basis that would sustain a free economy and then establish a system to accept foreign aid, and also to nurture both light & key basic industries at the same time, for a speedy capitalist development of the economy. In order to do so, the Syngman Rhee government heeded to the U.S. suggestion, and established a legal basis for a free economy by making amendments to the economic section of the Constitution, while also dissolving the government`s running of industries to facilitate private managements of the industry. The government also boosted key basic industries that manufactured fertilizers, plate glass, cement and steel. Yet promotion of key basic industries could have caused some controversies for expanding national running of the industry, so regulations that would dictate the transfer of those industries` control to the private sector had to be put in place. It was to let the government abide by the principle of the industries` free operation, a concept that was already agreed upon by both Korea and the U.S. And such move was also taken to make it possible for the Korean government to accept U.S. demands regarding free economy and at the same time enable rapid development of the economy, while also remedying Korean economy`s problems, such as imbalance in the industrial structure, insufficient capital, and the underdeveloped nature of the capitalists. The post-war efforts of the Syngman Rhee government for nurturing key basic industries displayed a layer of meanings. First, it shows us the Rhee government`s perception of the task of developing the heavy chemical industry. Rhee government considered heavy chemical industry as a key industrial area that would ensure the long-term prosperity of the entire industry, and an area which could proceed without interruption even after the foreign aid was ceased. So Rhee government wished that the development of key basic industries which had huge interactive potentials would lead to a full scale development in the heavy chemical industry. Second, Rhee government`s efforts show us that such efforts also included a fostering program for major capitalists directly aided and funded by the government. Rhee government planned to first develop key basic industries with funding from the Korean Industrial bank, and then transfer the operation of such industries to the private sector. The key basic industries were usually huge, and played a vital and instrumental role in the development of the economy and industries in general, so any private company chosen to oversee such industry would become a major capitalist in an instant. Third, Rhee government`s efforts show us the historical flow of the entire industrialization process, which was led by the State and later culminated in the Economic development plans of the Park Chung Hee government. The Koreans allowed the state to intervene in the economic operations of the country in order to break free from the colonial industry structure that had been established during the occupation period, and also in order to make possible a rapid capitalist development, after the Korean war. The State-led industrialization policies resulted in hatching the Industry Recovery plan, and construction of key basic industries.

2단 터보과급기 장착 승용디젤엔진에서 EGR 배열 방식이 EGR율에 미치는 영향에 대한 시뮬레이션

정진은(Chung, Jin-Eun),노호종(Roh, Ho-Jong),정재우(Chung, Jae-Woo) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.11

본 논문에서는 승용디젤엔진에서 유해배출물을 저감시키는 동시에 고연비를 달성하기 위하여 2단 터보과급 기와 EGR 장치를 장착한 디젤엔진에 대하여 EGR 배열 방식이 EGR율에 미치는 영향을 분석하기 위하여 시뮬레이션 을 수행하였다. 이를 위하여 AMESim을 사용하였고 엔진 부품을 위하여 IFP Engine Library를 사용하였다. 고압, 저 압, 반저압의 3가지 배열 방식이 고려되었다. 일반적으로 많이 사용되는 고압 방식과 저압 방식의 EGR 배열이 공연 비 21에서 각각 6.4%, 10.0%의 EGR율을 보인 반면, 두 방식의 혼합형인 반저압 EGR 배열 방식의 EGR율은 18.0% 의 값을 보였다. 따라서 2단 터보과급기와 EGR 장치를 장착한 엔진 설계시 엔진 성능과 유해배출물 발생량의 관점 에서 반저압 방식 EGR 시스템이 적절함을 보였다. In this study, the simulations were carried out to show the effect of the EGR configuration in a passenger diesel engine with 2-stage turbocharger on the EGR rate. The AMESim and IFP Engine Library were used to make the program for the simulation. Three EGR configurations, HPL(high pressure loop), LPL(low pressure loop), and SLPL(semi low pressure loop), were considered. The EGR rate in the HPL and LPL EGR routes were 6.4% and 10.0% respectively but the rate in SLPL route was 18.0% and their air/fuel ratio for all three cases was 21. Therefore the SLPL EGR configuration may be positively considered in the design of the passenger diesel engine with 2-stage turbocharger.

내지진강관의 특성 및 적용사례

정진안(Jin An Chung),전배호(Bae Ho Jeon) 한국강구조학회 2011 韓國鋼構造學會誌 Vol.23 No.5

가변형 터보과급기의 맥동 유동 성능 측정 시스템 개발

정진은(Jin Eun Chung),진영욱(Youngwook Jin),조훈기(Hungi-Cho),강우(Woo Kang),정재우(Jae Woo Chung) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-

A test bench which is consisted of roots blower, pulsator, air flow meter, driving unit for VGT actuator, transmitters for temperature and pressure, and the rotational speed sensor was developed to evaluate the characteristics of the VGT system. Measurements using VGT of the 2.0 L diesel engine were carried out. The corrected mass flow rate and the pressure ratio for the compressor of the VGT are related directly with the rotational speed, but they are independent of the rack position of the VGT. The pressure ratio and the corrected mass flow rate of the turbine of the VGT are related directly with the rack position of the VGT, but they don’t have any relation with the rotational speed. The mechanical efficiency of the VGT is higher than the conventional turbocharger in the wide range. The efficiency at the 0.03 kg/s of the mass flow rate is 4.36 times as high as that of the conventional turbocharger. These data will be used to develop the new engine equipped with the VGT system.

다구찌 기법을 이용한 FCM 가스켓의 강건 설계에 관한 연구

정진은(Chung, Jin-Eun),안중규(Ahn, Jueng-Kyu) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.7

본 연구에서는 비석면 FCM(Fiber-elastomer Coated Metal) 가스켓의 강건 설계를 수행하였다. 이를 위하여 직교배열표를 사용한 실험계획법에 따라 전단력을 측정하는 실험을 수행하고 다구찌 기법을 사용하여 망대 SN비를 산출하여 영향을 미치는 제어인자를 파악하고 분산 분석을 수행하였다. 전단력에 영향을 미치는 제어인자로 온도, 압 력, 시간 및 습도를 선택하였으며 각 제어인자에 대하여 3수준을 고려하여 L<sub>9</sub(3⁴)> 직교배열표를 작성하였고, 이에 근거하여 측정 실험을 수행하였다. 다구찌 기법을 사용하여 망대 SN비를 산출하고 델타 통계량을 계산하였다. 시간의 델타 통계량이 0.93으로, 시간이 전단력에 가장 큰 영향을 미치는 결과를 얻었다. 다음으로 온도, 압력, 습도 순으로 영향을 미쳤다. 또한 시간 80초, 온도 200 oC, 압력 90 kgf/cm² 습도 60 %RH의 조건에서 전단력이 최대가 됨을 보 였다. 이에 대한 분산 분석을 수행한 결과 시간과 온도는 각각 p값 0.037, 0.098을 보여 신뢰수준 95%와 90%에서 유 의함을 밝혔다. This paper deals with the robust design of the non-asbestos FCM(Fiber-elastomer Coated Metal) gasket. In order to this, the measurement of the shear stress based on the design of experimet using the orthogonal table was carried out and the control factors for shear stress using the larger-the-better SN ratios with the Taguchi method were evaluated. In addition, the analysis of variance for SN ratios was conducted. The temperature, pressure, duration time and humidity were selected as the control factors. The orthogonal table L<sub>9</sub(3⁴)> was made of 3 levels for each factor and the measurement of shear stress was acomplished on the base of the table. Delta statistics of time is the highest value 0.93 and therefore the time affect the largest effect on the shear stress of gasket. Also from the analysis, the shear stress shows maximun at the duration time 80 sec, temeratue 200 oC, pressure 90 kgf/cm2, humidity 60 %RH. P values of duration time and temperature as a results of the analysis of variance are 0.037 and 0.098. Therefore the analysis has significant each with 95% and 90% confidence level.

승용 디젤엔진 HIL 시스템의 응답 특성

정진은(Chung, Jin-Eun),노호종(Roh, Ho-Jong) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.11

본 연구에서는 터보과급기 테스트 벤치, 실시간용 소프트웨어와 DAQ의 HIL 플랫폼, 그리고 Matlab/ Simulink 로 작성한 엔진 모델로 구성된 HIL 시스템을 구축하고, HIL 시스템의 정상 작동 여부를 파악하기 위해 연료 공급량 을 단계적으로 변화시키는 시뮬레이션을 수행하였다. 연료 공급량을 1.8944 kg/h와 4.7360 kg/h 사이에서 단계적으로 변화시키고, 시스템이 설정된 목표 공연비 32를 추종하는지 여부를 분석하였다. 시뮬레이션의 결과 연료 공급량을 변화시킨 상태에서 20초 정도의 시간이 경과한 후 설정된 목표 공연비에 정상적으로 수렴하였다. 또한 연료 공급량 의 변화에 따라 터빈 베인 듀티비와 압축기의 부스트 압력도 적절하게 변화함을 확인하였다. 따라서 본 시스템은 터 보과급기 개발 및 성능 개선에 유용하게 사용될 수 있을 것으로 기대된다. A HIL(hardware-in-the-loop) system was established and the simulation was carried out to determine whether the system operates normally. The system consists of turbocharger test bench, HIL platform with real time S/W and DAQ, and engine model using Matlab/Simulink. In the simulation the supplied fuel rate is changed step-by-step from 1.8944 kg/h to 4.7360 kg/h. The change of air-fuel ratio is analyzed and observed whether the air-fuel ratio follow the target air-fuel ratio 32. When the supplied fuel rate is changed, the air-fuel ratio is converged to the target air-fuel ratio after about 20 seconds. And the vane duty ratio of turbine and the boost pressure of compressor are also changed properly. Therefore this HIL system can be used to develop the new turbocharger and improve the performance of the modified turbocharger.

HIL을 이용한 터보과급기 승용 디젤 엔진 성능 시뮬레이션

정진은(Jin-Eun Chung),정동영(Dong-young Jeong),정재우(Jae-Woo Chung),강우(Woo Kang) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

스마트 무인기 풍동시험

정진덕(Chung, Jindeog),최성욱(Choi Sungwook),이장연(Lee Jangyeo) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

Wind tunnel testings to develope tilt-rotor Smart Unmanned Aerial Vehicle (SUAV) were intensively performed. Small wind tunnel was used to find and evaluate design parameters and to fix general layout of configuration. The application of large tunnel with 40% scaled model is to collect performance and stability related aerodynamic data. During large scale model test wind tunnel is used as a tool to compare Flaperon types, to improve lift characteristics by using different height vortex generators and to alleviate nacelle separated flow effects on the wing.

배연탈황 공정 중 DSI 공법의 탈황효율 향상을 위한 전산 유체 역학적 연구(1)

정진도(Jin Do Chung),김장우(Jang Woo Kim),김병환(Byung Hwan Kim),박영문(Young Moon Park) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.1

스마트무인기에 적용한 유동제어 장치

정진덕(Jindeog Chung),홍단비(Danbi Hong) 한국항공우주연구원 2009 항공우주기술 Vol.8 No.1

스마트 무인기의 공력특성을 향상시키기 위하여 주익에는 와류생성기(vortex generator), 주익의 끝단에는 유동펜스(flow fence)를 적용하였다. 와류생성기는 SUAV의 최대양력계수와 실속각을 지연시키는 효과가 있었지만 높은 항력증가를 초래하여, 결국에는 양항비가 줄어들었다. 이를 개선하기 위하여 L-형태와 높이가 3㎜와 5㎜인 와류생성기를 적용하였다. 유동펜스는 나셀 틸팅각이 증가함에 따라 나셀에서 발생하는 박리에 의하여 주익성능이 감소하는 현상을 방지하기 위하여 사용하였다. 두 가지 유동제어 장치를 사용함에 따라 스마트 무인기의 공력특성들이 어떻게 변화하였는지를 정리하였다. To improve the aerodynamic efficiency of Smart Unmanned Aerial Vehicle (SUAV), vortex generators and flow fence are applied on the surface and the tip of wing. The initially applied vortex generator increased maximum lift coefficient and delayed the stall angle while it produced excessive increase in drag coefficient. It turns out reduction of the airplane's the lift/drag ratio. The new vortex generators with L-shape and two different height, 3㎜ and 5㎜, were used to TR-S4 configuration to maintain the desired level of maximum lift coefficient and drag coefficient. Flow fence was also applied at the end of both wing tip to reduce the interaction between nacelle and wing when nacelle tilting angles are large enough and produce flow separation. To examine the effect of flow fence, flow visualization and force and moment measurements were done. The variation of the aerodynamic characteristics of SUAV after applying flow control devices are summarized.