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성향점수를 이용한 직업간 혈압차이 비교연구 -전투기조종사와 일반인의 비교 자료를 중심으로-
이재창,신영곤,이성건 한국자료분석학회 2005 Journal of the Korean Data Analysis Society Vol.7 No.6
Recently, there are many studies to improve data quality and informations using data fusion, statistical matching techniques. In this study, we have introduced propensity score matching techniques as data enrichment, and applied the technique to health data of Korean fighter pilots. We have investigated and compared the blood pressure of pilots with normal people. 최근 자료의 결합을 통해 자료의 질을 향상시키고자 하는 많은 연구가 활발히 진행 중이다. 본 연구에서는 성향점수(propensity score)를 이용한 짝짓기 방법을 소개하고, 국내 전투기 조종사의 건강 상태에 대한 자료를 이용하여 실증적 분석결과를 제공하고자 한다. 전투기 조종사와 일반인과의 신체 특성을 객관적으로 비교하기 위하여 성향점수짝짓기 방법을 적용하고 이를 기존의 연구결과와 비교하였다.
정승묵,신영곤,이상훈,송국현,김영진,이낙규,나경환 한국반도체디스플레이기술학회 2004 반도체디스플레이기술학회지 Vol.3 No.4
Optical properties of PET(Polyethylene terephthalate), PC(Polycarbonate), Acrylic resin and PE(Polyethylene) sheets were studied as a function of heat treating temperature of $60^{\circ}C$ to $150^{\circ}C$. By the heat treatment, optical properties of transmittance, absorbance, and reflectance showed a considerable change with different ways according to the materials. To understand the reason of optical property change, X-ray diffraction and surface morphology were also investigated. It was observed that small crystallite and pore that can cause scattering largely affect the transmittance. It was suggested that change of surface chemical bond induce the reflectance variation.
균일류의 회전원주 제어에 의한 유동 및 공력 제어효과에 관한 연구
부정숙,양종필,김창수,신영곤,Bu, Jeong-Suk,Yang, Jong-Pil,Kim, Chang-Su,Sin, Yeong-Gon 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.3
The aerodynamic forces and wake structure of the non-rotating downstream circular cylinder, of which the uniform freestream flow is interfered with another spinning upstream cylinder having the same diameter that is located upstream in a line have been investigated experimentally. When the spin rate of the downstream cylinder defined as the ratio of tangential surface velocity of the spinning cylinder to the freestream velocity increases gradually from zero to 1.4, the change of surface pressure distribution, aerodynamic forces of the non-rotating downstream cylinder were measured in case of several distance ratios of 1.5, 3.0, and 4.5 defined as the ratio of distance between the centers of two cylinders to the diameter. The wake flow patterns behind the cylinder were also investigated in each case. From the present experiments, it has been found that the spin rate significantly influences the aerodynamic forces and near-wake flow phenomena of the downstream cylinder in such a way that the drag increases as the spin rate and distance ratio increase and the wake width increases as the distance ratio increases.
윤영민,윤정현,김부균,신영곤,송국현 한국광학회 2004 한국광학회지 Vol.15 No.4
광 커넥터 접합면의 스크래치가 삽입손실에 미치는 영향에 대하여 연구하였다. 광파의 투과계수가 스크래치의 깊이에 따라 선형적으로 변화한다고 가정하고 스크래치의 기하학적 파라미터들의 함수로 표현된 광 커넥터의 삽입손실을 계산하는 모델을 제시하였다. 3D Optical interferometry surface profiler를 이용하여 임의로 발생된 스크래치의 위치, 폭과 깊이와 같은 기하학적 파라미터들을 측정하였다. 측정된 삽입손실과 제안된 모델을 이용하여 계산한 삽입손실을 비교하여 스크래치의 깊이에 따라 선형적으로 변화하는 투과계수 식을 구하였다. 깊이에 따른 투과계수 식과 제시된 모델을 이용하여 스크래치로 인한 삽입손실을 스크래치의 위치, 폭과 깊이의 함수로 계산하였다. 스크래치가 코어 중심에서 코어 반경의 2배 정도를 벗어난 위치에 존재하면 삽입손실에 영향을 거의 주지 않음을 확인하였다. This paper presents the effect of scratches on an optical connector interface surface on the insertion loss of optical connectors. We propose a model for calculating the insertion loss of optical connectors. The model is expressed in terms of geometrical parameters of scratches assuming that the transmission coefficient of a light wave on the scratch surfaces is linearly varied as a function of scratch depth. Geometrical parameters of scratches such as location, width, and depth of scratches are measured using 3D optical interferometry surface profiler. We obtain the equation of the transmission coefficient in terms of scratch depth comparing the experimental insertion loss data to the insertion loss data using the model presented in this paper. Using the model and the equation of the transmission coefficient presented in this paper, we present the results of the insertion loss of optical connectors for various geometrical parameters of scratches. Scratches which are located at longer than two times the core radius from the center of the core show negligible effect on the insertion loss of optical connectors.