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차천석,김영남,심재기,김기형,양인영 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
차량 전면충돌시 에너지흡수량이 가장 큰 차량전면부 사이드부재의 기본형상인 점용접된 단일모자형 단면부재에 대하여, 정적(0.00017m/sec), 준정적(0.017m/sec) 축방향 압궤실험을 행하였다. 이를 기초로 자체 제작한 수직식 공기압 충격실험장치를 이용하여 실제 차량이 충돌하는 것을 상정하여 충격속도 7.19m/sec(충격에너지 1034J)하에서 형상의 변화 및 폭비와 플랜지 용접간격의 변화에 따른 압궤특성을 고찰하여, 최적의 에너지 흡수성능을 갖는 구조부재에 대하여 검토하였다. The fundamentally and widely used spot welded sections of automobiles(hat and double hat shaped section members) absorb most of the energy in a front-end collision. The sections were tested on axial static(0.00017m/sec) and -quasi-staic(0.017m/sec) loads. Based on these test results, spcimens with various thicknesses, width ratios and spot weld pitches on the flange have been tested with high impact velocity(7.19m/sec 1034J) which imitate a real life car arash Characteristics of collapse have been reviewed and structures of optimal energy absorbing capacity is suggested.
FEM에 의한 차체구조용 단일모자형 단면부재의 축압궤특성에 관한 연구
차천석,황창숙,백경윤,김기형,양인영 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
차체전면부 사이드부재는 점용접에 의해서 이루어진 모자형 단면형상을 갖는 강도부재로써, 차량의 전면충돌에 있어서 중요한 역할을 한다. 전면충돌에 있어서 차량의 전면부에서 충분한 에너지를 흡수한다면, 승차자에게 가해지는 충격에너지를 경감시킬 수 있다. 따라서, 이러한 강도부재는 충분한 강성을 가져야 하지만, 적절한 압궤 또한 이루어져야 한다. 본 연구에서는 단일모자형 단면부재에 대하여 플랜지부 점용접 간격을 변화시켜 준정적(0.017m/sec) 및 충격합궤(7.19m.sec, 1034J)하에서 압궤특성을 해석하고자 유한요소 프로그램인 LS-DYNA3D을 이용하여 준정적 및 충격압궤 시뮬레이션을 행하였다. 시뮬레이션은 압궤실험 결과와 비교함으로서 시뮬레이션의 타당성을 학인하였다. The hat shaped section members of vehicles compose the base frame which plays an important role in a front-end collision. It consists of the hat shaped section members with spot welds. In front-end collision, the impact energy for the passengers will be decreased as the front parts of vehicles has sufficiently absorbed energy. And then, this structures have not to be very stiff but collapse progressively to absorb the kinetic energy as expected. In this study. LS-DYNA3D has been used for analyzing collapse characteristics on hat shaped section members with respect to spot weld pitches under quasi-static(0.017m/sec) and impact load(7.19m/sec. 1034J). By comparing the results from simulation and the experimental results. the utilization fo simulation has been certified.
박히준,채윤병,차웅석,박종배,이혜정,이향숙,인창식,고형균,김수영,최일환,김강식,문정배,배기태,유경환,육근영,정병주,손인철,임사비나 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2004 東西醫學硏究所 論文集 Vol.2004 No.-
Background : The cun measurement System, an essential and convenient method in locating acupoints, has been widely used in the practice of acupuncture. However, traditional cun measurement has been criticized for its lack of reliability. Objectives : The purposes of this study are to determine if one cun measured by the directional methods have a consistency with that of proportional methods and to investigate which factors are related with these differences, especially in forearm. Methods : The distance between the elbow crease and the wrist crease of forearm was compared to a reference value of one cun obtained by the directional method. In this method, one cun is one third of the distance between index finger and Small finger of a subject, measured at proximal interphalangeal joint. In addition, to investigate the factors influencing the differences between these two methods, we measured the height and body weight and calculated body mass index (BMI). Finally we analyzed the factors correlated with these lengths by linear regression test. Results : The results showed that one cun obtained by the directional methods were significantly different from one cun by the proportional methods in forearm. It was demonstrated that the length acquired with the directional method was more correlated with body weight and body mass index, while the length obtained by the proportional method was more correlated with the height.
알코올 금단 발작 환자에서 진전 섬망 예방에 대한 Nimodipine과 Chlordiazepoxide의 효과 비교
정두신,양광익,이보람,방차옥,이태경,성기범,안무영,박형국 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.1
Background & objectives : An increase of calcium influx during alcohol withdrawal state may contribute to neuronal hyperexitability, which cause delirium tremens(DT). Some investigators have found calcium channel blockers effects in prevention of DT in experimental animals. Therefore we evaluated the preventive effects of calcium channel blocker(nimodipine) and benzodiazepine(chlordiazepoxide) on the development of DT in alcohol withdrawal seizure(AWS) patients. Method : A total 59 patients with AWS were divided into three groups according to the management nimodipine-treated, chlordiazepoxide-treated, and control(no specific medication) groups. We compared the incidence rates of DT in the three groups. Results : Total incidence rate of DT was 30.5%(18 of 59 patients). There were 6 DTs of 18 patients(33.5%) in nimodipine-treated group, 4 of 21 patients(22.5%) in chlordiazpoxide-treated group, and 8 of 20 patients(44.0%) in control. Conclusion : The control group(44.0%) showed the highest incidence rate of DT. And nimodipine-treated(33.5%) and chlordiazepoxide-treated group(22.5%) were followed. However, this result failed to demonstrated statistically significant differences due to small numbers size.
Gender-related Differences in Management of Nonvalvular Atrial Fibrillation in an Asian Population
Lee, Jung Myung,Kim, Tae-Hoon,Cha, Myung-Jin,Park, Junbeom,Park, Jin-Kyu,Kang, Ki-Woon,Shim, Jaemin,Uhm, Jae-Sun,Kim, Jun,Park, Hyung Wook,Lee, Young Soo,Choi, Eue-Keun,Kim, Chang-Soo,Joung, Boyoung,K The Korean Society of Cardiology 2018 Korean Circulation Journal Vol.48 No.6
<P><B>Background and Objectives</B></P><P>Gender-related differences in health care utilization for atrial fibrillation (AF) are increasingly recognized. However, large cohort data for examining gender-related differences in AF are lacking in Asian populations.</P><P><B>Methods</B></P><P>The Registry for Comparison Study of Drugs for Symptom Control and Complication Prevention of AF (CODE-AF Registry) is a prospective observational cohort-study that enrolled participants at 10 tertiary hospitals in South Korea. Baseline characteristics retrieved from the CODE-AF Registry were analyzed.</P><P><B>Results</B></P><P>A total of 6,274 patients were recruited (mean age 67±11 years, mean CHA<SUB>2</SUB>DS<SUB>2</SUB>-VASc score 2.7±1.7, 63% male, 65% paroxysmal AF) from June 2016 to April 2017. Women underwent less electric cardioversion (12.3% vs. 19.6%, p<0.001), less radiofrequency ablation (12.4% vs. 17.9%, p<0.001), and less antiarrhythmic drug therapy (44.7% vs. 49.5%, p<0.001), despite having more severe symptoms (symptom class III or IV, 45.8% vs. 37.5%, p<0.001). Among patients with a CHA<SUB>2</SUB>DS<SUB>2</SUB>-VA score of 2 or more, a slightly higher proportion of women were taking oral anticoagulants than men (85.7% vs. 81.9%, p=0.002), and non-vitamin K antagonist oral anticoagulant (NOAC) use was more prevalent in women than men (70.4% vs. 62.3%, p<0.001). Insufficient NOAC dosing was very common, more so in women than men (61.5% vs. 56.3%, p<0.001).</P><P><B>Conclusions</B></P><P>Female patients with AF were treated more conservatively and rhythm control strategies were used less frequently than in males, even though the female patients with AF had more severe symptoms. While insufficient NOAC dosing was common in both sex, it was significantly more frequent in women.</P>
서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)
김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2
Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.