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메틸알코올을 혼합한 가솔린 엔진용 연료의 배기가스제어에 관한 연구 (Ⅰ)
류정인(Jeong In Ryu),이성노(Seong No Lee) 대한공업교육학회 1979 대한공업교육학회지 Vol.4 No.1
In these days of endeavoring to reduce oil consumption and to control automobile exhaust emission gases in the air pollutions to be troubled in the whole world, because of the international oil shock and future oil exhaustion covering two times of 1974 and 1979, this study is obtained to conclusion to reduce hydrocarbon and carbon monoxide density from mixing methyl alcohol with gasoline and preheating and pressurizing intake air. The results were as follows: 1) It decreased carbon monoxide density with mixing methyl alcohol with gasoline. 2) It decreased hydrocarbon density with mixing methyl alchol with gasoline below 10%. 3) It decreased considerably carbon monoxide and hydro carbon density with preheating and pressurizing intake air.
가솔린 엔진용 대체연료의 타당성에 관한 연구 (Ⅱ) - 알코올 혼합연료의 성능 및 배출가스를 중심으로 -
류정인(Jeong In Ryu),정명진(Myeong Jin Jeong),조규상(Gyu Sang Cho) 대한공업교육학회 1981 대한공업교육학회지 Vol.6 No.2
In these days of endeavoring to reduce oil consumption and to control automobile exhaust emissions in the air pollutions to be troubled in the whole world, because of the international oil shock of 1974 and 1979 and in future oil exhaustion this study is obtained to conclusion to improve the engine performance and to reduce carbon monoxide density from mixing alcohol with gasoline through assistant alcohol injection. The results were as follows: 1) Generally it increased the thermal efficiency with mixing alcohol with gasoline. 2) It increased the engine output with mixing alcohol with gasoline through the assistant alcohol injection. 3) It decreased remarkably CO emissions with mixing alcohol with gasoline through the assistant alcohol injection.
류정인(Jeong In Ryu) 대한공업교육학회 1983 대한공업교육학회지 Vol.8 No.2
The whole world is troubled because of the international oil shocks of 1973 and 1979, and because of the worry of future oil exhaustion. In these days of endeavoring to reduce oil consumption and to control air pollution from automobile exhaust emissions, this study developed synthetic fuel and sought to improvd engine performance through the variable compression ratio. The results were as follow; 1) Synthetic fuel was obtained from phase seperation diagram. 2) As the compression ratio was increased, both regular gasoline and synthetic fuel were improved with engine performance. 3) Driven to wide open throttle, synthetic fuel was increased with engine performance.
[論文]가솔린 엔진용 代替燃料의 妥當性에 關한 연구(Ⅵ)
류정인(Jeong In Ryu),양옥용(Ok Yong Yang) 한국자동차공학회 1985 오토저널 Vol.7 No.4
This study consists of instrumenting and running tests on variable compression engines and measuring the following combustion characterics: (a) flame speed,(b) emissiion and (c) performance parameter such as power and economy.<br/> The results were as follows:<br/> 1) The phase separation diagram of substitute fuels were obtained from phase separation experiment.<br/> 2) The flame propagation speed of substitute fuels were higher than gasoline and increased with increasing methanol weight percente of substitute fuels.<br/> 3) BMEP of substitute fuels was slightly less than that of gasoline but in the range of small weight percente,BMEP was compatible to gasoline.<br/> 4) Concentration of rich equivalence ratio but increased with high compression ratio.In general,NOx concentration was much lower than that of gasoline.<br/> 5) Concentration of HC and CO increased for rich equivalence ratio.Also it was lower than that of gasoline.
류문현 ( Mun Hyun Ryu ),조승국 ( Seung Kuk Cho ),김정인 ( Jeong In Kim ) 한국환경정책학회 2012 環境政策 Vol.20 No.1
Economic damages of Natural disaster are increasing recently. Natural disaster reduces national economic growth or changes the structure of national economy. This study employs a Computable General Equilibrium (CGE) model to examine the effect of natural disaster on national economy. To estimate national economic damages of natural disaster provides information such as community vulnerability, worthiness of mitigation projects, appropriate level of disaster assistance, and recovery decisions. The result implies that natural disaster has an impact of reducing 5% of GDP in Korea on the assumption of no rehabilitation actions.
열수액화를 이용한 미세조류 추출잔사로부터 바이오원유 제조에 대한 반응인자의 영향
류영진(Young-Jin Ryu),신희용(Hee-Yong Shin),양지현(Ji-Hyun Yang),이윤우(Yunwoo Lee),정인재(Injae Jeong),박한울(Hanwool Park),이철균(Choul-Gyun Lee) 한국해양바이오학회 2017 한국해양바이오학회지 Vol.9 No.2
Hydrothermal liquefaction of lipid-extracted Tetraselmis sp. feedstock containing 80 wt.% water was conducted in a batch reactor at different temperatures (300, 325, and 350oC) and reaction times (5, 10, 20, 40, and 60 min). The biocrude yield, elemental composition and higher heating value obtained at various reaction conditions were used to predict the optimum conditions for maximizing energy recovery of biocrude with good quality. A maximum energy recovery of 67.6% was obtained at 325°C and 40 min with a high energy density of 31.8 MJ/kg and lower contents of nitrogen and oxygen. Results showed that reaction conditions of 325°C, 40 min was most suitable for maximizing energy recovery while at the same time achieving improved quality of biocrude.
x mol% 칼시아-안정화 지르코니아 나노분말의 수열합성 및 구조적 특성평가
류제혁,문정인,박연경,송정환,김택남,Ryu, Je-Hyeok,Moon, Jung-In,Park, Yeon-Kyung,Nguyen, Tuan Dung,Song, Jeong-Hwan,Kim, Taik-Nam 한국재료학회 2012 한국재료학회지 Vol.22 No.5
Pure zirconia and $x$ mol% calcia partially stabilized zirconia ($x$ = 1.5, 3, and 8) nanopowders were synthesized by hydrothermal method with various reaction temperatures for 24 hrs. The precipitated precursor of pure zirconia and $x$ mol% calcia doped zirconia was prepared by adding $NH_4OH$ to starting solutions; resulting sample was then put into an autoclave reactor. The optimal experimental conditions, such as reaction temperatures and times and amounts of stabilizer CaO, were carefully studied. The synthesized $ZrO_2$ and $x$ mol% CaO-$ZrO_2$ ($x$ = 1.5, 3, and 8) powders were characterized by XRD, SEM, TG-DTA, and Raman spectroscopy. When the hydrothermal temperature was as low as $160^{\circ}C$, pure $ZrO_2$ and $x$ mol% CaO-$ZrO_2$ ($x$ = 1.5 and 3) powders were identified as a mixture of monoclinic and tetragonal phases. However, a stable tetragonal phase of zirconia was observed in the 8 mol% calcia doped zirconia nanopowder at hydrothermal temperature above $160^{\circ}C$. To observe the phase transition, the 3 mol% CaO-$ZrO_2$ and 8 mol% CaO-$ZrO_2$ nanopowders were heat treated from 600 to $1000^{\circ}C$ for 2h. The 3 mol% CaO-$ZrO_2$ heat treated at above $1000^{\circ}C$ was found to undergo a complete phase transition from mixture phase to monoclinic phase. However, the 8 mol% calcia doped zirconia appeared in the stable tetragonal phase after heat treatment. The result of this study therefore should be considered as the preparation of 8 mol% CaO-$ZrO_2$ nanopowders via the hydrothermal method.
최정원(Jeong Won Choi),오동진(Dong Jin Oh),류정인(Jeong In Ryu) 대한공업교육학회 2002 대한공업교육학회지 Vol.27 No.1
The characteristics of the automotive air conditioning system are introduced and the development trends are explained in this paper. Today, more convenient and pleasant living conditions have become the most important viewpoint of the people. So to get the more comfort and good driving conditions, we are interested in the air conditioning system in an automotive more and more than before. The development trend is to research the technical methods of the variable displacement in the part of compressors and to study about the useful substitute materials as refrigerant and the natural refrigerant by considering the influence of environment in the field of refrigerant. In heat exchangers, the sub-cool condenser and the compact evaporator are researched and under development to achieve more efficiency. Also we need to take attention of the automotive air conditioning system and the education of this field.
김봉석,이영재,류정인,Kim, Bong-Seok,Lee, Yeong-Jae,Ryu, Jeong-In 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.3
In the present study, investigations were carried out to obtain data on combustion characteristics of methane gas and hydrogen supplemented methane gas in a constant volume combustion chamber. The main results obtained from the study can be summarized as follows. The maximum combustion pressure increases as the initial pressure and hydrogen supplement rate increase, the total burning time is shorten by lowering the initial pressure and by increasing the hydrogen supplement rate. The maximum flame temperature and NO concentration increase by the initial pressure and hydrogen supplement rate increase. The flame propagation processes in near stoichiometric mixture are propagated with a spherical shape, but in excess rich or lean mixtures are propagated with a elliptical shape. And, they are changed an unstable elliptical shape flame with very regular cells by increasing the hydrogen supplement rate.