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급성 심근경색증 환자에서 QRS 점수제와 총 Creatine Kinase 및 Creatine Kinase MB 유리량과의 관계
이영곤(Young Gon Lee),고명구(Myeong Ku Ko),김영조(Young Jo Kim),심봉섭(Bong Sup Shim),김종설(Chong Shul Kim) 대한내과학회 1988 대한내과학회지 Vol.34 No.4
N/A The QRS scoring system using observations of Q and R wave duration and R/Q and R/S amplitude ratios in the standard electrocardiogram is useful in estimating the size of myocardial infarcts. This study was undertaken to compare QRS system and total CK and CK-MB release for estimating myocardial infarct size in 26 patients with acute myocardial infarction. The overall correlation between QRS scores and total CK-MR release (r=0.717, p<0.01) were good. The better relations between QRS score and total CK and CK-MB release in the patients with anterior AMI (r=0.647, r=0.636, independently) were showed. These data suggest that QRS scoring system will be clinically useful in estimating myocardial infarct size and assessing prognosis and efficacy of tretment in patient with AMI.
[진동·소음부문] 흡차음재를 이용한 차량 실내소음 특성 비교
이영곤(Young-Gon Lee),김재도(Jae-Do Kim),고병재(Byung-Jae Ko) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, the characteristic of interior noise for automobile was analyzed for the purpose of designing and making more comfortable automobile. Three different cars were tested by near-field method and window method. To study the effect of noise source and the characteristic of automobile, interior noise is analyzed by SPL, AI and frequency analysis. Experimental results indicate that the main sources of noise were the generator and the gear box in the car and the RV, which was the fuel injection pump in truck. The noise attribution is very high in the dash ISO pad in the car and the RV, in the floor of truck. When the insulation/absorption materials are used, the interior noise is reduced about 3 - 10dB in each car. The characteristic of interior noise of each car is analyzed and the results are compared with each other.
Sn-3.0wt.%Ag-0.5wt.%Cu 솔더 볼 접합부의 고속전단 특성
이영곤 ( Young Gon Lee ),이희열 ( Hee Yul Lee ),문정탁 ( Jeong Tak Moon ),박재현 ( Jai Hyun Park ),한신식 ( Shin Sik Han ),정재필 ( Jae Pil Jung ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.9
The effects of shear speed and tip height on the high speed shear test of Sn-3.0wt.%Ag-0.5wt.%Cu ball joints were investigated. Solder balls of 450 μm in diameter were reflowed at 245℃ on a FR4 PCB (Printed Circuit Board) in order to obtain a sample for the high-speed shear test. The UBM was comprised of Cu/Ni/Au, and the shear speed and tip height varied from 0.5 to 3.0 m/s, and from 10 to 135 μm, respectively. According to the experimental results, faster shear speed enhanced the shear strength of the solder joints, regardless of the tip height. The fraction of ductile (solder) fracture decreased when the shearing speed was raised from 0.5 to 3.0 m/s. With an increasing tip height from 10 to 50 and 135 μm, the fracture mode changed from pad lift to mixed (ductile and brittle) and ductile fracture, respectively, while the shearing energy also increased in the same order. The shear energy had a proportional relationship with the fraction of the solder fracture.
소프트웨어 재사용을 위한 COMPONENT의 식별에 관한 연구
이영곤(Young Gon Lee),권용래(Yong Rae Kwon) 한국정보과학회 1987 한국정보과학회 학술발표논문집 Vol.14 No.2
재사용 가능한 소프트웨어 component를 식별하기 위한 중요한 고려 사항은 사용자의 요구에 완전히 부합하는 component가 없을 경우 가능한 그에 유사한 component에 대한 정보를 제공할 수 있도록 하는 것이다. 본 논문에서는 재사용 가능한 component들 간의 관련성을 수평적 관점과 계층적 관점에서 표현할 수 있도록 함으로써 사용자의 요구에 비슷한 component를 식별하는 과정에서의 accuracy와 power를 향상시키도록 하였다. 이를 위해 enumerative scheme과 faceted scheme을 결합하여 소프트웨어 component들을 분류하였다. 또한 소프트웨어 component를 기술하는 데 사용되는 term들을 체계적으로 결정하고, 그 term들에 가중치를 부여함으로써 component에 대한 표현력을 향상시키고 아울러 component 식별의 정확성을 향상시켰다. 사용자 query를 구성함에 있어서는 meta-expression이나 partial descriptor등을 허용함으로써 사용자에게 편의를 제공하고자 하였다.