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김정은(Jung Eun Kim),박지현(Ji Hyun Park),임한석(Han Seuk Lim),이상윤(Sang Yoon Lee),정성욱(Seong Wuk Jeong),정인석(In-Seuck Jeung) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.5
메탄 로켓은 친환경성, 재사용가능성, 현지자원 활용 가능성 등의 장점을 지니고 있어, 차세대 로켓 추진시스템으로서 각국에서 활발한 개발이 이루어지고 있다. 최근 난류 연소에 관한 수치해석 툴이 발달하면서 초임계 영역에서의 메탄-산소 연소장에 대한 수치적 해석을 통해 현상을 이해하려는 연구가 수행되고 있다. 또한 이를 통해 추력기의 설계에 필요한 핵심 특성 변수 및 설계변수 도출을 수행 할 수 있다. 현재 차세대우주추진연구센터(SPRC)에서는 고성능 메탄 추력기 개발을 위한 연구가 진행되고 있으며, 본 논문에서는 이를 위한 체계적인 수치적 방법과 현재까지 수행된 연구결과를 간략히 정리하였다. Global interest in methane rocket engines has been growing due to its eco-friendliness, reusability, and its potential for In-Situ Resource Utilization (ISRU). Recent enhancement of numerical analysis tools enable to provide resonable results for understanding the methane-air combustion in trans/supercritical condition. In addition, they can contribute to suggest the characteristic variables and design parameters for designing and manufacturing the new methane thruster. Recently started development program, SPRC, contains a subdivision for developing a high performance methane thruster. In this paper, systematic numerical strategy and some numerical result are presented.
On-Board Computer Hardware Design using ARM Cortex M4 Processors
Abhas Maskey(압하스),Ji Hyun Park(박지현),Vishnu Anand Muruganandan(비슈누),In-Seuck Jeung(정인석) 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4
Seoul National University is developing an On-Board Computer (OBC) based on ARM Cortex M4 processors from STMicroelectronics. The microcontroller (MCU) has the capacity to run at 180㎒ maximum frequency, has a Floating Point Unit (FPU) and has a performance of 225DMIPS. The nominal power consumption while all peripherals are activated is 323.4㎽ and can has low power modes to conserve power. The processor is supported by a flight tested STM32F405RG processor as a node for in-orbit firmware update and fault detection. The OBC also features as the Attitude Determination and Control System (ADCS), and has an 8MB SDRAM for dynamic data while supporting 8MB of flash memory and backup of 4GB memory through microSD card. The ADCS can drive up to 4 magnetorquers (MTQs). The OBC has a flexible design and the same design has been applied for imaging payload.
정인석(In-Seuck Jeung) 한국자동차공학회 1989 오토저널 Vol.11 No.5
This short report describes the trend of exhaust emission control of the diesel engine vehicles in Korea, which originally was motivated from the newly proposed Emission Control Regulation of Diesel Engine Vehicles possibly to be activated in 1991 by Korean Environmental Protection Agency.<br/> This short survey report has been prepared by the special working group of The Korea Society of Automotive Engineers (KSAE) on this particular subject. This report includes (1) estimation of portions of contribution of diesel engine vehicle emission to total air pollution, (2) comparison of proposals of new articles/regulations/laws in Korea with those of other selected countries such as USA, European countries, and Japan, (3) comparison of vehical emission control regulations in Korea with those in other selected countries, (4) technical aspects of possibilities of reduction of diesel engine vehicle emissions, (5) additional administrational aspects of technology development program, (6) social impact resulted from the severe emission control regulation on diesel engine vehicles, and (7) proposals, prepared by the special working group of the KSAE, on the emission control regulation of diesel engine vehicles, which can possibly bring better cleaner air released from the air pollution resulted from diesel engine exhaust emissions in real sense with minimal financial contribution, with optimal technological efforts, with less social impacts, within five to ten year period.
[論文] 光吸收性 粉體粒子에 對한 레이저散亂光 粉體粒度測定機의 反應 特性
정인석(In Seuck Jeung),조경국(Kyung Kook Cho) 한국자동차공학회 1984 오토저널 Vol.6 No.2
Berglund-Liu 振動方式 單分散 粉體粒子 發生機(Berglund-Liu vibrating orifice monodisperse aerosol generator에 依하여 制作한 單分散 光吸收性 標準粉體粒子를 使用하여 레이저 散亂光粉體粒度測正機(Knollenberg active scattering aerosol spectrometer)의 反應特性을 調査하였다.<br/> 實驗結果, 機器의 反應特性은 Mie 散亂理論에 依하여 計算한 理論式와 매우 잘 一致하며 特히 光吸收性 粉體粒子는 光通過性 粉體粒子가 多意的인 特性을 나타내는 것에 反하여 거의 單調增加하는 一意的인 特性을 가지고 있으며 光吸收性 粉體粒子의 反應特性이 製作者의 較正値에 가까운 決果를 나타내었다.<br/>
하이퍼 혼합기를 사용한 저엔탈피 초음속 유동장 내 연소 특성 연구
김채형(Chae-Hyoung Kim),정인석(In-Seuck Jeung) 한국추진공학회 2013 한국추진공학회지 Vol.17 No.6
In this study, a forced ignition method with a plasma jet torch is studied in Mach 2 laboratory scaled wind-tunnel. The hyper-mixer is used as a mixer. For two normal injection cases, the one is collided against a wedge plate of the hyper-mixer and the other is directly injected into the cold main flow. For the first case, the hyper-mixer disperses the injected fuel, leading to the mixing enhancement. Furthermore, the fuel-air mixture is provided into the plasma hot gas, which enhances the combustion performance. However, the direct injection into the main flow method spends amount of fuel without ignition in the cold supersonic flow. In the end, for the forced combustion, it is important to supply the fuel-air mixture into the heat source.
[論文] 熱線白金抵抗線을 利用한 過度的 傳播火焰의 火焰溫度測定에 關한 硏究
정인석(In-Seuck Jeung),조경국(Kyung-Kook Cho),황상순(Sang Soon Hwang) 한국자동차공학회 1985 오토저널 Vol.7 No.3
The flame temperature of LPG-air premixture flame was measured by extrapolation of limiting case corresponding to the infinitely thin diameter of Platinum-resistance-hot-wire.LPG-air premixture flame, initially under atmospheric pressure and room temperature, propagates downward from top of the model combustion chamber maintained at constant pressure through the whole combustion process.<br/> Analytical calculation technique was also applied to determine full temperature history or spatial temperature distribution from flame reaction zone to burnt gas region.