http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박영대(Youngdae Park),유일수(Ilsoo Yoo),구정서(Jeongseo Koo),권태수(Taesoo Kwon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Buffer stop are normally defined as steel structure at track end, in such places as railway station, depot or siding etc" Firstly it serves as warning marks for the end of a track, Secondly, in the event of a train impact it is their task to absorb the resultant energy to minimize the damage or the potential damage so that neither the impacting train, the passenger or the environment might be damaged or injured. In domestic technology of buffer stop, there have been totally ineffective design up to current day, that is, rigid and immovable buffer stop without any energy absorbing capability have been used on the track as a stop made from steel or concrete, Therefore, sturdy on the concept design for buffer stop to minimize damage of railway vehicle and passenger in the event of vehicle impacting was carried out in this paper.
준 능동형 로터를 이용한 마이크로 혼합기의 제작 및 혼합특성
김용대(Youngdae Kim),이종광(Jongkwang Lee),권세진(Sejin Kwon) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.4
A micro-mixer with a quasi-active rotor was fabricated, and mixing characteristics were evaluated. The proposed micro-mixer combines an active type micro-mixer with a passive type micro-mixer. The micro-rotor, which is a moving part of an active type micro-mixer, is added in a micro-chamber of a passive type vortex micro-mixer. The rotor rotated by inflows tangent to a chamber, causing strong perturbations. The micromixers were fabricated using photosensitive glass. Mixing efficiency of the micro-mixers was measured using an image analysis method. Mixing efficiency and characteristics of the micro-rotor mixer were compared with the vortex micro-mixer without a rotor. Mixing efficiency was reduced as Reynolds number increased at a low Reynolds number due to decrease of residence time. Mixing efficiency at higher Reynolds number, on the other hand, was improved even though residence time decreased since the contact surface between fluids increased by twisted flow. The perturbation induced by rotating rotor at greater than Re 200 improved the efficiency of the rotor mixer.
JinWon Noh,Hyunchun Park,YoungDae Kwon,InHye Kim,YoHan Lee,YoonJung Kim,SinGon Kim 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.6
Objective-According to previous social survey, a high number of North Korean refugees (NKRs) in South Korea had suicidal ideation. The purpose of this study is to examine the related factors for suicidal ideation among NKRs by gender in South Korea. Methods-We examined the sample of NKRs, 701 subjects (men=160, women=-541) residing in South Korea, the participants were enrolled from October 2008 to May 2014. The related factors with suicidal ideation in NKRs were analyzed via a logistic regression analysis. Results-Refugee women were more likely to have suicidal ideation than men were. Although thoughts of suicide do not necessarily mean that they will follow through, however, there is an association that the higher rate of suicide also results in a higher rate of attempted suicide. In both genders, they tended to think more frequently about suicide who had stayed in South Korea for more than 5 years. In addition, higher frequencies of suicidal ideation also associated with higher level of perceived stress in both genders. Conclusion-The gender difference should be addressed when designing suicide prevention interventions among the North Korean population in South Korea.
JinWon Noh,HeeSoon Juon,Sanghoon Lee,YoungDae Kwon 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.3
Objective-The purpose of this study is to examine the relationship between substance use and depressive symptoms in a cohort of Koreans aged 45 years and older from a large, population-based study. Using the 2006 Korean Longitudinal Study of Aging, we estimated the prevalence of depressive symptoms and its association with smoking and alcohol use. Methods-Depressive symptoms were measured using the CES-D 10-item scale. Age, marital status, educational attainment, employment and any disability were the control variables. Because there were gender differences in smoking and alcohol use, we also performed a separate analysis by gender. Results-In the multivariable logistic regression, ex-drinkers were more likely to be depressed than non-drinkers (OR, 1.37; 95% CI, 1.08–1.74 for males; OR, 1.78; 95% CI, 1.23–2.57 for females). Compared to non-drinkers, males with moderate drinking habits (OR, 0.75; 95% CI, 0.63–0.90) were less likely to be depressed, whereas heavy male drinkers were more likely to be depressed (OR, 1.43; 95% CI, 1.07–1.91). Female smokers were more likely to be depressed than female non-smokers (OR, 2.07; 95% CI, 1.51–2.83). Conclusion-This study showed atypical pattern of relationship between smoking and depression and U-shaped relationship between depressive symptoms and alcohol consumption in male population. Both of these findings could be inferred from that these regional characteristics might be cross-sectional finding of chronologic transition result from a rapid rise of late life depression in Korea.