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[가솔린엔진] 초음파 연료 공급장치가 가솔린 엔진의 연비 및 배기가스에 미치는 영향
윤면근(M.K. Yoon),방효민(H.M. Bang),김진구(J.G. Kim),이홍섭(H.S. Lee),류정인(J.I. Ryu) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study investigated engine performance and exhaust gas by comparing ultrasonic energy added gasoline fuel used ultrasonic energy fuel feeding system with the conventional gasoline fuel<br/> This results are obtained as follow<br/> 1. In engine performance, it was found that specific fuel consumption, brake power, and brake thermal efficiency was improved more 3.5%, 4.73%, 3.63% respectively in case of ultrasonic energy added gasoline fuel than in case of conventional gasoline fuel.<br/> 2. We knew that ultrasonic energy decreases HC and CO, decreases NOx at low load but increases at high load
윤면근(M. K. Yoon),최영구(Y. G. Choi),백수곤(S. G. Baek),류정인(J. I. Ryu) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
This experiment was undertaken to investigate the spray characteristics of the conventional injection system and the ultrasonic energy added injection system. Test fuels were diesel fuel and mixed BC oil. The injection temperatures of mixed BC oil were the normal temperature(20˚C) and the high temperature(95 ± 2 ˚C). Sauter mean diameter was measured under the variation of th" spray distance. In this thest, injection pressure was 120kg/cm². To measure the droplet size. we used the Malvrn system 2600C. Droplet size distribution was analyzed from the result data of Malvern systern. After this experiment, we found that the condition of the ultrasonic energy added injection and high temperature injection had smaller Sauter mean diarmeter of droplet than that of the conventional <br/>
홍윤석,Seo, S. M.,김종배,서명희,최지훈,윤면근,남기중 한국레이저가공학회 2008 한국레이저가공학회지 Vol.11 No.1
Decapsulation technology is useful to inspect EMC of package device and the etching technology enable to check inside of device by removing plastic molding. Chemical etching method is used widely to fabricate a lot of semiconductor. But the method has some disadvantage due to wet process. Proposed method in this paper shows the application possibility such as fast processing time, processing accuracy and dry process. These result was obtained by directly removing of packed EMC using UV laser.