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안병규(Byoungkyu Ahn),류호성(Hosung Ryu),오은탁(Euntak Oh),송규근(Kyukeun Song),정재연(Jaeyoun Jung) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Ambient gas density and Temperature effect on the width and height of Impingement spray were examined. The gas chamber density was varied 18kg/㎥ to 30kg/㎥, temperature was varied 293K to 473K. These ranges included gas density are top-dead-center conditions in current technology light-duty diesel engines. The Spray images were used to measure the impingement spray characteristics by the spray shape as the function of time and space. A mechanically actuated KP-PE type injection system was used to supply the fuel into a pressurized and heated spray chamber.<br/> With the higher density and temperature, the Impingement spray characteristic is decreased. On the other hand, The effect of temperature hardly be found in the highest density<br/> <br/>
고온·고압 분위기에서의 충돌 분무 특성에 관한 실험적 연구
안병규(Byoungkyu Ahn),정병국(Byongkoog jung),조태영(Taeyoung Cho),송규근(Kyukeun Song),정재연(Jeayoun Jung) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
In a high-speed DI diesel engine, injected fuel sprays impinge on the wall of piston cavity. In the experiments<br/> presented here, diesel fuel was injected into a high temperature and pressure chamber in which compressed N2 gas.<br/> In this studies, We examined about impinging spray considering ambient density (18, 24 ,30 kg/m3), ambient<br/> temperature (293,473K). The images of impinging spray were obtained by the high speed video camera. After that<br/> we analyzed the impinging spray characteristics to use the images.<br/> From theses results, The effects of ambient density, ambient temperature and on the characteristics of impinging<br/> spray were investigated.<br/> Finally, the experimental equations of the radial distance and the axial distance of the impinging spray were<br/> proposed as functions of above mentioned variables .
안병규(Byoungkyu Ahn),박재현(Jae-Hyun Park) 한국정보과학회 2009 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.10
대형병원에서 환자의 치료와 진단을 목적으로 하루에 생산되는 의료영상의 발생량은 보다 정확하고 정밀한 진단이 요구되는 촬영장비와 네트워크 인프라의 발달로 나날이 증가하고 있으며, 앞으로 그런 추세는 계속 될 것이다. 따라서 기존방식의 PACS보다 성능이 개선된 시스템이 요구된다. 본 연구에서는 영상압축속도를 개선하기 위해, 계산그리드 기술을 이용하여, PACS의 부분시스템으로써, 의료영상압축 저장시스템을 설계 구현하였다. 제안된 시스템의 시작품을 사용한 실험을 통해, 처리기들이 추가됨에 따라 성능이 향상됨을 확인하였다. The use of medical imaging in hospitals is being gradually increased as it is of utmost importance in treatment and diagnosis of patients. With the drastic increase of the usage of medical imaging in hospitals per day necessitates more speedy and accurate systems for precise diagnosis and the treatment. Hence the modality and development of network infrastructure are also need to be improved day by day and this trend may be continued. Thus there is a great need improvement of PACS concerned. In this paper, by using the computational grid technology, we design a medical image storage system that improve the compression speed, and implement a prototype as a part of PACS. We also demonstrate the performance improvement from experimental results of the prototype.
안병규(Byoungkyu Ahn),조태영(Taeyoung Cho),송규근(Kyukeun Song),정재연(Jaeyoun Jung) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The Characteristics of diesel Spray have much effect on the engine performances such as power, fuel economy and emissions. Therefore, the measurement of fuel spray characteristics is very important for the improvement of heat engine.<br/> The factors which control diesel spray characteristics are injection pressure, ambient temperature and density on diesel sprays.<br/> We measured spray angle, spray penetration by using the images of high speed video camera. Experimental results are summarized as follows; <br/> 1) Ambient temperature and density influence on the characteristics of diesel spray.<br/> Namely, As ambient temperature and density are increased, spray penetration is decreased but spray angle is increased.<br/> 2) Experimental equation of spray penetration is expressed as follows<br/> 0< t< t??; S₁= 11. 628??P??ρ??t??<br/> t??<t; S₂=7.457??P??ρ??t??<br/> 3) Experimental equation of spray Angle is expressed as follows T??=293K; tan (θ/2)=0.59(ρ??/ρ??)??<br/> T??=473K; tan (θ/2) =0.588(ρ??/ρ??)??<br/> <br/>