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분사각 및 분공 직경이 예혼합 압축착화 엔진 연소에 미치는 영향
국상훈,공장식,박세익,배충식,김장헌,Kook, Sang-Hoon,Kong, Jang-Sik,Park, Se-Ik,Bae, Choong-Sik,Kim, Jang-Heon 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
The effect of injector geometries including the injection angle and number of nozzle holes on homogeneous charge compression ignition (HCCI) engine combustion has been investigated in an automotive-size single-cylinder diesel engine. The HCCI engine has advantages of simultaneous reduction of PM and NOx emissions by achieving the spatially homogenous distribution of diesel fuel and air mixture, which results in no fuel-rich zones and low combustion temperature. To make homogeneous mixture in a direct-injection diesel engine, the fuel is injected at early timing. The early injection guarantees long ignition delay period resulting in long mixing period to form a homogeneous mixture. The wall-impingement of the diesel spray is a serious problem in this type of application. The impingement occurs due to the low in-cylinder density and temperature as the spray penetrates too deep into the combustion chamber. A hole-type injector (5 holes) with smaller angle ($100^{\circ}$) than the conventional one ($150^{\circ}$) was applied to resolve this problem. The multi-hole injector (14 holes) was also tested to maximize the atomization of diesel fuel. The macroscopic spray structure was visualized in a spray chamber, and the spray penetration was analyzed. Moreover, the effect of injector geometries on the power output and exhaust gases was tested in a single-cylinder diesel engine. Results showed that the small injection angle minimizes the wall-impingement of diesel fuel that results in high power output and low PM emission. The multi-hole injector could not decrease the spray penetration at low in-cylinder pressure and temperature, but still showed the advantages in atomization and premixing.
전력케이블용 가교폴리에틸렌의 공간전하 극성측정기술에 관한 연구
국상훈,서장수,김병인,박중순 한국조명전기설비학회 1992 조명.전기설비 Vol.6 No.6
Charged particle in the polymers is supposed to affect the electrical conduction and to lead them th dielectrical breakdown finally. So we measured the space charge distribution made by application of high electric field and evaluated the polarity of the charged particle affected on electrical conduction and space charge formed in the insulating materials by using temperature gradient thermally stimulated current measurement method(TG-TSC measurement). As a result, in the cross-linked polyethylene, A-peak was caused from dipole polarization, C-peak was caused from ionic space charge polarization and D-peak was injected trap hole. Also we found it crossible the evaluated the polarity of injected trap carrier and electron(or hole) of carrier trap in the cross-lined polyethylene. We found that ${\gamma}$-ray irradiated low density polyethylene had a relation to the electronic trap and we also could get the value of electric field distribution in the samples of which evaluation was available.
분사기 형상이 예혼합 압축착화 엔진 연소에 미치는 영향
국상훈(Sanghoon Kook),공장식(Jangsik Kong),이승원(Sengwon Lee),최욱(Wook Choi),배충식(Choongsik Bae) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effect of injector geometries including the injection angle and number of nozzle holes has been investigated in a diesel-fueled homogeneous charge compression ignition (HCCI) engine. The HCCI engine has advantages of simultaneous reduction of PM and NOx emissions by achieving the spatially homogenous distribution of diesel and air mixture, which results in no fuel-rich zones and low combustion temperature. The wall-impingement of the diesel spray to the cylinder liner is a serious problem to achieve the homogeneous charge. It is because the injection timing should be extremely earlier than the conventional direct-injection (DI) diesel engine to achieve the homogeneous charge, so that the in-cylinder pressure and temperature is very low that results in longer spray penetration. A hole-type injector (5 holes) with small injection angle (100°) instead of conventional angle (150°) was applied to resolve this problem. The multi-hole injector (14 holes) was also tested to maximize the atomization of diesel. The macroscopic spray structure was visualized in a spray chamber, and the spray penetration was analyzed. Moreover, effect of injector geometries on the power output and exhaust gases was tested in a single-cylinder diesel engine. Results showed that the small injection angle minimizes the wall-impingement of diesel fuel that results in high power output and low PM emission. The multi-hole injector could not decrease the spray penetration at low in-cylinder pressure and temperature, but still showed the advantages in atomization and premixing.
LB 절연박막을 사용한 전기전자산업용 MIM소자의 발생기전력
국상훈,서장수,Taro Hino 한국조명전기설비학회 1993 조명.전기설비 Vol.7 No.3
전기전자산업에 유기분자집합체에 대한 전자 device적 기능을 갖게 하는 초전막형성 기술의 하나로서 LB막이 이용되게 된다. 10여년전에 만들어 대기중에 방치되었던 Langmuir Blodgett(LB) 초전막 시료에 대해서 MIM구조소자에 전하가 발생하는 특성을 검토하였다.그 결과 LB막이 무극성일 때는 상하부전극을 동일 금속으로 하면 전압이 발생하지 않고, 서로 다른 금속전극으로 할 때는 전압이 발생하였는데 양전극금속의 일함수값의 차가 클수록 발생전압이 높았고 LB막이 유극성일때는 동일 전극이라도 전압이 발생하였다.따라서 LB초전막의 MIM 소자에서 발생하는 전하는 단순한 화학작용에 의한 것이 아니고양전극 금속의 일함수와 극성에 관계가 있다고 생각된다.
국상훈,서장수,박상현,권영수,Taro Hino 한국전기전자재료학회 1993 電氣電子材料學會誌 Vol.6 No.3
Langmuir-Blodgett(LB) 초박막 MIM구조의 소자에서 직류전압이 발생된다는 것은 이미 잘 알려져 있다. 발생전압의 원인은 LB막과 전극사이의 어떤 화학반응에 의한 것으로 보고되었다. 본 논문에서는 1986년에 제작되어 공기중에 방치된 LB 초박막 시료를 대상으로 실험한 결과, 제작 당시와 동일한 크기의 전압이 발생하고 있음을 확인할 수 있었다. 이때 LB막과 전극의 두께는 각각 20~30.angs. 및 2000.angs.정도이었다.
국상훈,고두석 한국전기전자재료학회 1988 電氣電子材料學會誌 Vol.1 No.4
포리에틸렌, 테레프탈레트를 금속감화물로 오염시켜 열자극특성을 중심으로 가동이온의 중성화, 재이온화 및 이동의 과정등에서 이온의 거동에 관하여 검토하였다. PET가 오염이 되면 이온이 증가되고 전극금속의 영향이 있으며 고온에서 서브리니어 특성을 가지며 가동이온의 증성화 현상이 있는 것을 밝혔다. 가동이돈의 주기적 운동에 기인한 직류전기전도모델로 실험한 결과가 정성적으로 정상전류 전압 특성과 일치함이 입증되었다.