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김학성(Hack-Seang Kim),박정섭(Jung-Sup Park),박해자(Hae-Ja Park),지형준(Hyung-Joon Chi) 한국생약학회 1980 생약학회지 Vol.11 No.1
A Study of the effects of the root components of Angelica gigas Nakai (Umbelliferae) on voluntary activity in mice has confirmed that there are: 1) MeOH soluble extract, MeOH insoluble extract, decursin and decursinol were antagonized against the voluntary activity in mice pretreated with a dose of caffeine natrium benzoate 30㎎/㎏. 2) MeOH insoluble extract, showed higher depressant effect than MeOH soluble extract. 3) The depressant activity of decursinol was significantly more highly effective than that of decursin.
Duk-Sang Kim,Young-Joon Park,Seang-Wock Lee,Yong-Seok Cho 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.1
Emission regulations for automobiles have become more stringent and the improvement of emission during cold start has been a major key issue to meet these regulations. Among many kinds of factors that affect cold start operation, ignition timing is crucial to improve emission characteristics due to the influence on exhaust gas temperature. Recent progress in variable valve timing allows optimized valve event strategies under various ranges of engine operating conditions including cold start. This study investigates effects of ignition and exhaust valve timing on exhaust gas temperature, combustion stability and emission characteristics through cold start bench tests of an SI engine. Experimental results show that exhaust valve timings and ignition timings significantly affect exhaust gas temperature and stability of engine operation under cold start condition. Exhaust valve timing also affects CO and NOx emission due to changes in residual gas fraction of the combustion chamber. Ignition timing mainly affects exhaust gas temperature and HC emission. A control strategy, advanced exhaust valve timing and retarded ignition, is plausible in order to achieve reduction of exhaust emission while maintaining stability under cold start operation of SI engines.
LNT 촉매에서 환원제 분사 조건에 따른 De-NO<SUB>x</SUB> 특성에 관한 실험적 연구
모지환(Ji-Hwan Mo),박영준(Young-Joon Park),송춘섭(Chun-Sub Song),윤여빈(Yu-Bin Yoon),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
LNT(Lean NOx Trap) catalyst is an aftertreatment system typically used to reduce oxides of nitrogen(NOx) emissions for diesel engine. During the lean condition of exhaust gas, NOx is stored in the LNT catalyst and released and reduced during the rich condition of exhaust gas. In generally, rich condition of exhaust gas is made by post fuel injection or injection of the reductant such as CO₂, HC. The most effective method for de-NOx performance is an optimum injection rate of reductant as a function of exhaust gas condition. Injection rate of reductant made by diesel fuel has effected on the fuel economy and NOx reduction efficiency. This paper aimed to figure out evaluate to effect of exhaust gas temperature, O₂ concentration in exhaust gas and mass of reductant injection for de-NOx peformance of LNT catalyst using the test rig. Space velocity is held 30,000 h?¹ that is generally measured high reduction performance in catalyst. In result, NOx conversion efficiency is the highest when the specification temperature of exhaust gas and reduced NOx concentration in exhaust gas as injection rate of reductant increases. O₂ concentration in exhaust gas is 4%, NOx reduction efficiency is higher than 10% of O₂ concentration in exhaust.
가솔린 기관의 냉간시동 조건에서 합성가스 배기분사 기술의 최적 분사압력에 관한 실험적 연구
박정권(Jung-Kwon Park),박영준(Young-Joon Park),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Synthetic gas reformed from hydrocarbon-based fuel consists of H₂, CO and N₂. Hydrogen contained in synthetic gas is very useful species in chemical process, due to wide flammability range and fast burning speed. The ESGI(Exhaust Synthetic Gas Injection) is used to shorten a light-off time of a three-way catalyst through combustion of synthetic gas injected in exhaust manifold during a cold start period of an SI engine. When injection pressure of synthetic gas is increased, exhaust gas temperature rises due to increment of total heat. However, total CO emitted in the vehicle is increased, because synthetic gas has its own CO, and fuel consumption is also deteriorated. If injection pressure of synthetic gas is excessively increased, exhaust gas temperature will decrease due to increment of inert gas and heat capacity under low O₂ concentration condition for combustion of synthetic gas. Also efficiency of THC reduction ought to be considered for various injection pressures of synthetic gas because it is greatly affected by exhaust gas temperature. In this study, injection pressure of synthetic gas was precisely varied to optimize injection pressure in terms of exhaust gas temperature, harmful emissions and fuel consumption. Experimental results showed that the optimized injection pressure is 1.5 bar.
김재완,김학성,신현식,지형준 한국약제학회 1979 Journal of Pharmaceutical Investigation Vol.9 No.4
A study on the effects of the root components of Angelica koreana Max. on voluntary activity in mice has confirmed that: 1. MeOH soluble Ex., MeOH insoluble Ex., oxypucedanine and isoimperatorin were antagonized against the voluntary activity in mice pretreated with a dose of C.N.B. 30㎎/㎏. 2. MeOH insoluble Ex. showed higher depressant effect than MeOH soluble Ex.. 3. the depressant activity of oxypucedanine was significantly more effective than that of isoimperatorin.