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제올라이트계 촉매의 기공구조 조절를 통한 항공유의 흡열량 향상 연구
현동훈(Dong Hun Hyeon),김중연(Joongyeon Kim),전병희(Byung-Hee Chun),김성현(Sung Hyun Kim),정병훈(Byung Hun Jeong),한정식(Jeong Sik Han) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.5
극초음속 비행체에서는 공기와의 마찰열과 엔진열의 증가로 기체 내부의 열적 부하가 발생한다. 이는 비행체 내부 구조물의 변형을 일으키고 오작동을 발생시킬 수 있다. 흡열연료는 액체 탄화수소 연료로써 흡열반응을 통해 열을 흡수할 수 있는 연료이다. 본 연구에서는 exo-tetrahydrodicyclopentadiene을 모델연료로써 선정하고 제올라이트 촉매의 금속담지를 통하여 흡열 특성의 변화를 측정하는 연구를 수행하였다. 이를 통하여 상용촉매보다 우수한 흡열성능을 가지는 촉매를 확보하였다. 본 연구의 목적은 흡열량 향상에 미치는 촉매의 특성을 연구하는 것이다. 이 촉매는 상용촉매를 대체하여 exo-THDCP를 흡열연료로 사용하는 시스템에 적용될 수 있을 것이다. In hypersonic aircraft, increase of aerodynamic heat and engine heat leads heat loads in airframe. It could lead structural change of aircraft’s component and malfunctioning. Endothermic fuels are liquid hydrocarbon fuels which are able to absorb the heat load by undergoing endothermic reactions. In this study, exo-tetrahydrodicyclopentadiene was selected as a model endothermic fuel and experiments on endothermic properties were investigated with pore structure controlled zeolite catalyst using metal deposition. We secured the catalyst that had better endothermic performance than commercial catalyst. The object of this study is inspect catalyst properties which have effect on heat absorption improvement. Synthetic catalyst could be applied to system that use exo-THDCP as endothermic fuel instead of other commercial catalyst.
초고속 비행체 냉각을 위한 연료의 흡열성능 개선용 성형촉매 적용연구
현동훈(Dong Hun Hyeon),이태호(Tae Ho Lee),김성현(Sung Hyun Kim),정병훈(Byung Hun Jeong),한정식(Jeong Sik Han) 한국추진공학회 2017 한국추진공학회지 Vol.21 No.3
In hypersonic aircraft, increase of aerodynamic heat and engine heat leads heat loads in airframe. It could lead structural change of aircraft’s component and malfunctioning. Endothermic fuels are liquid hydrocarbon fuels which are able to absorb the heat load by undergoing endothermic reactions. In this study, exo-tetrahydrodicyclopentadiene was selected as a model endothermic fuel and experiments were investigated in endothermic fuel cooling system with zeolite catalyst. Three shapes of catalysts have been manufactured and endothermic characteristics were recovered. Bineded catalyst showed higher heat absorption and conversion than other two zeolite catalysts. In product distribution, binded catalyst showed higher aromatics composition.
제올라이트계 촉매의 기공구조 조절을 통한 항공유의 흡열량 향상 연구
현동훈(Dong Hun Hyeon),김중연(Joongyeon Kim),전병희(Byung-Hee Chun),김성현(Sung Hyun Kim),정병훈(Byung-Hun Jeong),한정식(Jeong Sik Han) 한국추진공학회 2014 한국추진공학회지 Vol.18 No.5
In hypersonic aircraft, increase of aerodynamic heat and engine heat leads heat loads in airframe. It could lead structural change of aircraft’s component and malfunctioning. Endothermic fuels are liquid hydrocarbon fuels which are able to absorb the heat load by undergoing endothermic reactions. In this study, exo-tetrahydrodicyclopentadiene was selected as a model endothermic fuel and experiments on endothermic properties were investigated with pore structure controlled zeolite catalyst using metal deposition. We secured the catalyst that had better endothermic performance than commercial catalyst. The object of this study is inspect catalyst properties which have effect on heat absorption improvement. Synthetic catalyst could be applied to system that use exo-THDCP as endothermic fuel instead of other commercial catalyst.
촉매특성조절 및 2단계 크래킹반응을 이용한 액체연료의 흡열량 향상 연구
현동훈(Dong Hun Hyeon),김중연(Joongyeon Kim),전병희(Byung-Hee Chun),김성현(Sung Hyun Kim),정병훈(Byung Hun Jeong),한정식(Jeong Sik Han) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
극초음속 비행체에서는 공기와의 마찰열과 엔진열의 증가로 기체 내부의 열적 부하가 발생한다. 이는 비행체 내부 구조물의 변형을 일으키고 오작동을 발생시킬 수 있다. 흡열연료는 액체 탄화수소 연료로써 흡열반응을 통해 열을 흡수할 수 있는 연료이다. 본 연구에서는 exo-tetrahydrodicyclopentadiene을 모델연료로 선정하고 촉매 특성을 조절한 제올라이트의 2단계 반응을 통하여 흡열특성의 변화를 측정하는 연구를 수행하였다. 이를 통하여 상용촉매보다 우수한 흡열성능을 가지는 촉매를 확보하였다. 본 연구의 목적은 흡열량 향상에 미치는 촉매의 특성을 연구하는 것이다. 이 촉매는 상용촉매를 대체하여 exo-THDCP를 흡열연료로 사용하는 시스템에 적용될 수 있을 것이다. In hypersonic aircraft, increase of aerodynamic heat and engine heat leads heat loads in airframe. It could lead structural change of aircraft’s component and malfunctioning. Endothermic fuels are liquid hydrocarbon fuels which are able to absorb the heat load by undergoing endothermic reactions. In this study, exo-tetrahydrodicyclopentadiene was selected as a model endothermic fuel and experiments on endothermic properties were investigated with characteristic controlled zeolite catalyst using 2 step reaction. We secured the catalyst that had better endothermic performance than single commercial catalyst. The object of this study is inspect catalyst properties which have effect on heat absorption improvement. Characteristic controlled catalyst could be applied to system that use exo-THDCP as endothermic fuel instead of other commercial catalyst.
김성용,현동훈,Kim, Sung-Yong,Hyun, Dong-Hun 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.4
Thermal infrared cameras have been conducted actively in various application areas, such as military, medical service, industries and cars. Because of their characteristic of sensing the radiant heat emitted from subjects in the range of long-wavelength($3{\sim}5{\mu}m$ or $8{\sim}12{\mu}m$), and of materializing a vision system, when general optics materials are used, they don't react to the light in the range of long-wavelength, and can't display their optic functions. Therefore, the materials with the feature of higher refractive index, reacting to the range of long-wavelength, are to be used. The kinds of materials with the characteristic of higher refractive index are limited, and their features are close to those of metals. Because of these metallic features, the existing producing method of optical systems were direct manufacturing method using grinding method or CAD/CAM, which put limit on productivity and made it difficult to properly cope with the increasing demand of markets. GASIR, a material, which can be molded easily, was selected among infrared ray optics materials in this study, and the optical system was designed with two Aspheric lenses. Because the lenses are molded in the environment of high temperature and high pressure, they require a special metallic pattern. The metallic pattern was produced with materials with ultra hardness that can stand high temperature and high pressure. As for the lens mold, GMP(Glass Molding Press) of the linear transfer method was used in order to improve the productivity of optical systems for thermal infrared cameras, which was the goal of this paper.
주정의존 환자에서 Sodium Lactate 정주 후에 유발되는 공황 발작의 빈도 및 Clonidine에 의한 성장 호르몬 둔화 반응
최인근,현동훈,유태혁,Choi, Ihn-Geun,Hyun, Dong-Hun,Yoo, Tae-Hyuk 한국정신신체의학회 1996 정신신체의학 Vol.4 No.1
This study was performed to explore the frequency of panic attack induced by sodium lactate in alcohol dependence patients and to compare the extent of blunted growth hormone reponses after clonidine infusion with that of normal controls. The authors investigated 10 alcohol dependence patients receiving inpatient care in Hangang Sacred Heart Hospital from March 2, 1993 to August 31, 1993 and 10 normal controls. The disagnosis of alcohol dependence was based on DSM-III-R. Thirty minutes after the sodium lactate infusions clonidins were administrated. Venous bloods were sampled before the sodium lactate infusions, and 30, 45, 60, 90 minutes after the administrations of clonidine. Plasma growth hormone levels were measured by RIA method. The results were as follows : 1) In the questionaires of Hamilton Anxiety Rating Scale, Hamilton Depression Raing Scale, CAGE, Korean MAST, the scores of alcohol dependent patients were higher than those of normal controls. 2) Sixty percent of alcohol dependence patients and twenty percent of normal controls had panic attacks induced by sodium lactate. 3) All panic attacks induced by sodium lactate were relieved after clonidine infusions. 4) There were blunted growth hormone responses after clonidine infusions in alcohol dependence patients who had sodium lactate induced panic attacks like panic disorder patients. These results suggest that alcohol dependence patients may have noradrenergic abnormality same as panic disorder patients and two disorder may have high biological correlations each other.
초정밀가공 기술을 이용한 광학 마이크로패턴의 광 반사 효과에 관한 연구
유춘근,윤철용,현동훈,Yoo, Chun-Kun,Yoon, Chul-Yong,Hyun, Dong-Hun 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.2
Because the Ultra-Precision Technology increase its competitiveness in the field of the design, precision of processing technology, confidence and fixation degree are major considerations. According to Pattern shapes using these processing technologies, Light Reflection has influence on the sense of sight about human being. Based on background of these studies, we draw a plan about a round workpiece using a 3D design program and analyze the effect on Light Reflection changing a pattern angle and a source of light through SPEOS program in this research. We make Pattern form as V-Shape, and compare the area distributed by Light Reflection by classifying angle into 4 and analyze changes according to a source of light. In order to measure and evaluate the data from simulation analysis we has manufactured Diamond Tool and has processed Pattern precision using a Ultra-Precision Machine. Based on the result of this study, we forecast that the field of design will achieve rapid growth due to Ultra-Precision Technology in the world market.
초음속 비행체 냉각을 위한 연료의 흡열분해 반응에서 제올라이트 촉매의 비활성화 메커니즘
이태호(Tae Ho Lee),현동훈(Dong Hun Hyeon),김성현(Sung Hyun Kim),정병훈(Byung Hun Jeong),한정식(Jeong Sik Han) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
극초음속 비행체에서는 공기와의 마찰열과 엔진열의 증가로 기체 내부의 열적 부하가 발생한다. 이는 비행체 내부 구조물의 변형을 일으키고 오작동을 발생시킬 수 있다. 흡열연료는 액체 탄화수소 연료로써 흡열반응을 통해 열을 흡수할 수 있는 연료이다. 본 연구에서는 흡열연료 촉매에서의 비활성화 메커니즘을 분석하기 위해 methylcyclohexane과 n-dodecane을 모델 연료로 선정하여 반응 후 생성물과 탄소침적물을 분석하여 흡열연료 제올라이트 촉매의 비활성화 유형과 형태를 규정하였다. 본 연구의 목적은 흡열연료 제올라이트 촉매의 비활성화 유형과 형태를 연구하여 추후 촉매의 개선 방향을 제시하는 것이다. In hypersonic aircraft, increase of aerodynamic and engine heat lead thermal load in airframe. It could lead structural change of aircraft’s component and malfunctioning. Endothermic fuels are liquid hydrocarbon fuels which are able to absorb the heat load by undergoing endothermic reactions. In this study, methylcyclohexane and n-dodecane were selected as a model endothermic fuel. After the reaction, products and carbon deposits were analyzed to define the type and mode of deactivation of the endothermic fuel zeolite catalyst. The object of this study is that investigate the type and mode of deactivation of endothermic fuel zeolite catalyst, and suggest the catalyst improvement.
김영찬(Young-Chan Kim),현동훈(Dong-Hun Hyun) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Shrinkage is inherent in the injection molding process. Shrinkage occurs because the density of polymer varies from the processing temperature to the ambient temperature. So. this dissertation is concerned with ultra-precision profile measurement of aspheric surfaces, and then compensate an aspheric form error using Polynomial.