체결 토오크에 따른 강성계수 변화

강성황 가톨릭상지대학 사회개발·산업기술연구소 1999 論文集 Vol.29 No.-

볼트로 체결되어 있는 구조물에서 볼트에 가해지는 체결 토오크에 따라 결합 접촉면의 부재 내부에 발생하는 응력 분포변화를 유한 요소해를 이용하여 확인하였다. 또한 유한 요소해석과 진동 실험을 통하여 체결 토오크에 따른 결합 강성을 고찰하고 반정점각의 변화를 규명하였다. 결합부의 체결력이 증가함에 따라서 구조물의 고유 진동수는 증가하다가 일정한 값에 수렴한다. 이는 결합부의 강성이 체결력 증가와 함께 변화하고 있음을 의미한다. 체결력의 증가와 함께 반정점각(α)이 정적인 유한요소 해석과 동적 실험을 통해서 같이 증가함을 알 수 있다. The member stiffness in a bolted connection has a direct influence upon safe design with regards to both static and fatigue loading. Osgood and Mischke used a constant half-apex angle(α=30˚, 45˚) to obtain the member stiffness in a bolted connection. They didn't consider the stiffness variation under the clamping torque. The purpose of this study is to identify the relationship between the clamping torque variation and the joint stiffness in a bolted connection. The dynamic experiment and the finite element method are performed. The finite element method uses spring elements for a bolted connection considering clamping torque variation. The results shows that the structures with bolted joints converge to a constant frequency according to the increase of clamping torque. The half-apex angle changes as the clamping torque.

하이드로릭 엔진 마운트의 동특성 측정에 관한 연구

강성황 가톨릭상지전문대학 1997 논문집 Vol.27 No.1

The requirements of engine mount are basically to support the powertrain to body structure, to minimize a vibration transferring from engine to the powertrain caused by sudden starting and braking of vehicle. In general, to minimize noise and vibration levels requires a soft mounting system, while to maintain engine movement control requires a stiff mounting system for the auto-motive application. In this study, a hydraulic engine mount is investigated so as to examine its dynamic behaviour and function considering a stiffness and loss coefficient. Experiments are also performed to look into the damping characteristics in lower and higher frequency range when installing these mounts on a car by dynamic servo hydraulic tester.

미끄럼 방지 제동시스템에 대한 실험적 고찰

강성황(Sunghwang Kang),김재호(Jaeho Kim) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.5

두 평행한 관의 출구로부터 방출되는 트윈파에 관한 연구

강성황(Kang, Sung-hwang),김재호(Kim, Jae-Ho),김희동(Kim, Heuy-dong) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.8

The twin-impulse wave discharged from two parallel tubes is investigated to see flow patterns, compared with the single impulse wave. In the present study, the merging phenomena and propagation characteristics of the impulse waves are investigated by experiment and numerical computation. The Harten-Yee's total variation diminishing scheme is used to solve the unsteady, two-dimensional, compressible, Euler equations. The Mach number Ms of incident shock wave is lower than 1.5 and the distance between the tubes is between 1.2 and 4.0. In the shock tube experiment, the twin impulse waves are visualized by a Schlieren optical system in order to validate the computational result. It is shown that on the symmetric axis between two parallel tubes, the peak pressure produced by the twin impulse waves and its location strongly depend upon the tube distance and the incident shock Mach number, Ms. The predicted Schlieren images show a good agreement with the measured twin-impulse wave.

포스타 전시 발표 : 신장 ; 한국형 출혈열에 동반된 급성췌장염 2예

황진수,김원,박성광,강성귀 대한내과학회 1999 대한내과학회 추계학술대회 Vol.57 No.-

綜合學問으로서의 韓國學

姜聲渭(사회자),朴秉濠(토론자),金麗壽(토론자),黃性模(토론자),李成茂(토론자),金容稷(토론자),孫鳳鎬(토론자) 한국학중앙연구원 1981 한국학 Vol.4 No.1

Physostigmine과 procyclidine으로 구성된 유기인제 중독 복합예방제에 대한 2주 반복투여 용량설정시험

황재식(Zai-Zhi Huang),강현구(Hyun-Gu Kang),박선희(Sun-Hee Park),강성귀(Seong-kwi Kang),이종성(Jong-Sung Lee),박종일(Jong-Il Park),김왕수(Wang-Soo Kim),피택산(Taek-San Phi),황석연(Seok-Yeon Hwang),강종구(Jong-Koo Kang),김윤배(Yun-Bae 한국실험동물학회 2003 Laboratory Animal Research Vol.19 No.4

항만 소유구조에 따른 효율성 모형 비교연구

황진수,전홍석,강성,Hwang, Jin-Soo,Jorn, Hong-Suk,Kan, Sung-Chan 한국통계학회 2009 응용통계연구 Vol.22 No.6

항만이나 공항의 소유구조에 대한 효율성 분석은 지금까지 서로 엇갈리는 결과를 제시하고 있다. 즉, 민영화 또는 공영화로 인한 효율성 효과가 자료 또는 분석 방법에 따라서 일치된 결과를 보여주지 않고 있다. 본 논문은 국내의 항만이 포함된 국제 항만 교역데이터베이스를 기반으로 베이지안 확률적 프런티어 모형을 적용하여 항만의 소유 구조에 따른 효율성 분석을 하였다. 소유 구조는 Tongzon과 Heng (2005)의 방법을 따랐으며 제안된 몇 가지 모형과 그들의 모형을 DIC 통계량을 이용하여 비교하였다. 베이지안 추론에 필요한 MCMC 방법은 Griffin과 Steel (2007)에서 소개된 WinBUGS 프로그램을 이용하여 구현하였다. Few studies have investigated the quantitative relationship between port ownership structure and port efficiency with mixed results. This paper therefore contributes to the empirical literature by investigating the impact of port privatization on port efficiency using sample data drawn from the world's major ports. Moreover, this study applies the Bayesian approach to estimate the impact of port ownership on port efficiency. We fit Bayesian stochastic frontier model which is introduced by Griffin and Steel (2007) by WinBUGS. World's 25 main ports data are used for analysis. Based on MCMC sampling, we estimate parameters of the model and efficiency index of each ports. Moreover, we add estimates from package Frontier 4.1c in order to compare them with Bayesian results.

이상태위에 관한 임상통계학적 고찰

황순경(SK Whang),오원섭(WS O),남궁성은(SE Namkoog),강성원(SW Kang),김기원(KW Kim) 대한산부인과학회 1977 Obstetrics & Gynecology Science Vol.20 No.9

1. 안위의 발생빈도는 72예로서 0.17%(1:573.2)이었다. 2. 분만회수에 따르는 안위의 빈도는 초산부에서 0.16%, 5회이상의 다산부에서 0.48%로 분 만회수가 증가할수록 발생빈도는 높다. 또 연령층으로는 30세를 중심으로 한 연령에서 호 발하며 최연소 연령은 21세, 최고 연령은 48세 이었다. 3. 임신지속주수는 37주에서 40주사이가 55.56%로 제일많고 태아체중은 2,500㎎ 이상 4,000 ㎎ 미만이 84.72%로 대부분을 차지하였다. 4. 원인적인 요소로서는 협골반, 다산, 양막조기파수, 거대아, 조산, 선천성기형, 자궁내태아 사망 등의 순서로 나타났으며 29.7%인 21예에서는 정확한 원인을 알 수 없었다. 5. 하순기판(mentum)에 따른 태아의 위치는 후위 하순기판 (menum posterior) 31.94%이고 횡위 하순기판(mentum transverse)이 13.89%이었다. 6. 분만방식은 자연분만이 48.61%, 제왕절개술이 43.06%, 겸자분만이 8.33%이었다. 또 초산 부와 후위 하순기판(mentum posterior)의 태위에서는 제황절개술에 의한 분만율이 높았고 경산부와 전위 하순기판(mentum anterior)에서는 질식분만이 많았다. 7. 질식분만에서의 제1기 분만기간이 12시간 이내인 경우는 56.10%이었고 43.90%는 12시 간 이상이었다. 제2기 분만시간이 2시간 이상인 예는 7.32%이었다. 8. 모성사망은 없었고 교정 주산기 사망율(corrected perinatal mortality rate) 2.78%이었다. 9. 산전관리를 받은 산모는 48.61%이었고 산전관리를 받지않은 경우는 53.39%이었다. 즉 산전관리가 안위를 예방하는 것에 큰 도움을 주지 못했다. The purpose of the present study is to analyze the face presentations whing occured during the preiod from jan. 1970 through Dec. 1974 at the Catholic Medical College, Dept. of obstetricw and Gynecology and to Discuss the various aspects and difficulties encountered in their management. Thin paper analyzen 72 face presentations in singleton which occured in 41272 deliveries and the results were obtained as follows; 1) the incicence of face presentation was 0.17 per cent (1:573.2) 2) the incidence based on the parity was 0.16 per cent in primigravida and 0.48 percent in grandmultipara (over para V). Age distribution was concentrated on thirty degree and the youngest was 21 years old and the oldest was 48 years old. 3) As to the gestational weeks and fetal body weight, 55.56 per cent was 37 weeks to 40 weeks and 84.72 per cent was 2500gm to 4000gm in body weight. 4) Contracter pelbis, grandmultipara, premature rupture of membrane, excssivesized infants, amall baby, and anencephaly were significant etiologic factors, but 29.17 per cent of face presentations was not known the exact etiological factors. 5) Regarding to the position of the fetal mentum, 54.17 per cent was mentum anterior, 31.94 per cent was mentum posterior and 13.89 per cent was mentum transverse. 60 the method of deliveries were spontaneous delivery (48.61%), cesarean section (43.06%) and forcep delivery (8.33%). the rate of cesarean section was high in primigravida and mentum posterior of fetal position. On the other hand, the method of vaginal delivery was high in multipara and mentum anterior position. 7) As to the duration of labor, 56.10 per cent of all cases was completed within 12 hours in first stage and 7.32 pre cent was over 2 horus in second stage of labor. 8) there was no maternal death and the corrected perinatal mortality rate was 2.78 per cent. 9) Antental care did not help the preventio of the face presentation.

활성조류를 이용한 SBR공정에서 유입수 농도의 영향

강성재 ( Seong Jae Kang ),황은주 ( Eun Ju Hwang ),김정숙 ( Jeong Sook Kim ),이병헌 ( Byung Hun Lee ) 한국수처리학회 2004 한국수처리학회지 Vol.12 No.3

This study was conducted to investigate the effect of influent concentrations in SBR process using activated algae. Modified McKinney equation was applied to this study for understanding of results. Influent concentrations affect the active biomass(MaA, MaB) and Algae/Bacteria ratio. The initial Algae/Bacteria ratio of 1.0 were changed to 2.78, 2.18, 1.29 and 0.97 at Case 1(300/50/10), Case 2(300/100/10), Case 3(600/50/10), Case 4(600/100/10), respectively. COD removal efficiency were obtained above 93%, T-N removal efficiency were 49.85% and T-P removal efficiency were 12~67% without aeration, respectively. The results showed that modified McKinney equation application was useful for interpreting the activated algae processes. The results of modified McKinney equation indicated that the fraction of nitrogen removed by denitrification or stripping was increased to the extend of 75.1% with increasing CODcr. And the fraction of phosphorus removal by precipitation was increased to the extend of 77.4% with increasing CODcr.