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Marx 고전압 펄스 발생장치의 제작 및 동작특성에 관한 연구
정운관,육종철 慶熙大學校 1984 論文集 Vol.13 No.-
This study is to investigate the operating characteristics of a Marx high voltage pulse generator, which is designed and fabricated for the purpose of constructing a linear theta-pinch plasma generating facility. The Marx generator consists of a 2 kJ capacitor bank of maximum output voltage of 200kV, a set of main spark switch, a triggring system, and high voltage charging power supply. The experimental results show that the operating characteristics of the generator can be controlled through varying nitrogen pressure as a filling gas. The output pulse of the generator is achieved close to the estimated voltage with the rise time of 3 μ seconds. The stability of the generator is also very satisfactory within operating range of main spark switch.
200m 달리기시 곡선 구간과 직선 구간 동작의 운동학적 변인 비교 분석
김용운,정철수,은선덕,이영석 한국운동역학회 2000 한국운동역학회지 Vol.10 No.1
본 연구는 단거리 달리기(200 m)의 곡선 구간과 직선 구간의 동작을 비교 · 분석하여, 운동학적 변인의 차이를 규명하고, 곡선 구간의 동작 메카니즘에 대한 기초적인 정보를 제공하기 위해, 서울체육고등학교의 100 m 및 200 m 달리기 선수 5명을 대상으로 하여, 3차원 영상 분석법을 통하여 동작을 분석하였다. 본 연구에서 도출된 결론은 다음과 같다. 1. 신체중심의 높이는 직선 구간이 곡선 구간보다 높았으며, 신체중심 변위의 변화는 곡선 구간에서 더 컸다. 2. 신체중심의 수평속도는 곡선 구간이 직선 구간보다 컸으며, 곡선 구간에서 내측 스트라이드 국면이 외측 스트라이드 국면보다 컸다. 3. 신체중심의 수평 측면속도는 평균값에서 곡선 구간과 직선 구간이 차이가 없었으나, 속도의 절대값에서는 곡선 구간이 직선 구간보다 컸다. 4. 곡선 구간 내, 외측 스트라이드 국면의 이지, 착지시 접선속도는 차이가 없었다. 5. 스트라이드 길이는 곡선 구간의 외측 스트라이드가 가장 길었으며, 직선 구간, 곡선 구간의 내측 스트라이드 순서로 길었다. 6. 스트라이드 빈도는 곡선 구간과 직선 구간에서 차이가 없었다. 7. 상체 전경각의 평균값은 곡선 구간과 직선 구간에서 차이가 없었으나, 범위는 곡선 구간이 직선 구간보다 컸다. 8. 상체 측경각은 평균값에서 곡선 구간이 직선 구간보다 컸으나, 범위는 차이가 없었다. 9. 상완의 운동범위는 곡선 구간과 직선 구간에서 차이가 없었다. 10. 무릎거양각은 곡선 구간이 직선 구간보다 운동범위가 컸다. 이상의 결과, 단거리 달리기의 곡선 구간에서 직선 구간과는 차별화된 수행 형태를 보였으며, 내, 외측 스트라이드 간에도 상이한 수행 형태를 보였다. This study was conducted to make a comparative analysis of running motion and to examine the differences of kinematice in curved and straight track portion during the 200m sprinting. In this study, five skilled male sprinters of high school served as subjects. The running motions were analyzed using the method of three-dimensional cinematography The conclusions of this study were as follows. 1. Height of the center of gravity in straight portion was higher than that in curved portion, but displacement of the center of gravity in curved portion was higher than that in straight portion. 2. Horizontal velocity of the center of gravity in curved portion was faster than that in straight portion, and in curved portion that of left stride phase was faster than that in fight stride phase. 3. There was no difference in mean value of lateral component of horizontal velocity between both portions, but absolute value of that in curved portion was faster than that in straight portion. 4. There was no difference in tangential velocity at the instant of touchdown and takeoff of both strides on curved portion. 5. Stride length in right stride of curved portion was the longest, and next to that, that of straight portion was, and left stride of curved portion was the shortest. 6. There was no difference in stride frequence between curved and straight portion. 7. There was no difference in mean value of forward lean angle between both portions, but active range of that in curved portion was larger than that in straight portion. 8. Mean value of inward lean angle in curved portion was larger than that in straight portion, but no difference in active range of that between both portions. As the conclusion of this study, it was clear that there were significantly different running patterns between curved and straight portion, and between left and right stride of curved portion.
계측용 포터블 ESPI장치에 의한 강구조물의 결함 및 진동해석에 관한 연구
김경석,정현철,최지은,정운관,김홍건 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.2
평판의 진동모드와 진동수의 실험적 해석을 비접촉 광학적 방법인 ESPI법을 이용하여 상세히 기술하였다. ESPI를 이용하여 진동모드와 진동수를 측정하기 위해 두 개의 다른 재료 로 된 시험편을 준비하고 세장비의 변화에 따라 두 개의 다른 가진점을 택해 가진 하였다. 측정된 결과는 유한요소해석(FEA) 및 Warburton이 제안한 이론해석과 정성적으로 비교하였다. 실험적 결과는 이론해석 결과는 물론 FEA 결과와도 잘 일치함을 알수 있었다. 결과적으로 ESPI 법이 진동모드와 진동수의 고정도 해석에 이용할 수 있음을 확인하였다.
국내외 외과전공의 수련교육제도 비교 - 수련목표와 교육과정을 중심으로 -
정철운(Chul-Woon Chung),이경포(Kyung Po Lee) 한국의학교육학회 2002 Korean journal of medical education Vol.14 No.1
Purpose: The role of graduate medical education (GME) has become more important at the flood of knowledge and technical development. The korean board system in general surgery has a short history and has been developed mostly by the executive authorities rather than by autonomous civil organizations which is the case in america and europe. The aim and curriculum of our residency education is not yet well established, so that there requires the need to evaluate and analyze the training system of other well-established countries. Methods: The structures of residency education and their characteristics in U.S.A., England and Germany were reviewed from the literatures and internet sites in terms of aims and objects of learning during the training period. The korean system was compared to these characteristics. Results: Comparing the residency training programmes of U.S.A., Germany and England to our system there found some characteristic points as following that would be recommendable to be adopted for the renewal of our training programme. 1) Autonomous civil organizations endeavor for the regulations of educational goal, requirements and their accreditation. 2) The understanding of basic sciences that provide the fundamental principles of surgery was emphasized during the education. 3) Modern surgical techniques as a part of minimal invasive surgery can be easily acquired during the training course. 4) Participation in emergency medicine and intensive medicine was almost mandatory. 5) Interdisciplinary training and effective rotation schedule were highly recommended. All these characteristics could be actively integrated into our education, if we elaborate more well-established educational goal and curriculum for the residentship.
Park, Chul-Min,Seo, Hyeong-Seok,Cho, Jung-Ho,Choi, Da-Hye,Jeong, Young-Shin,Chung, Min-Chul,Jung, Sang-Chul,Jeong, Woon-Jo,Ban, Jae-Sam,Ahn, Ho-Geun American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.8
<P>In order to reutilize the spent metallic titanium chips, TiO2 photocatalysts were prepared using the self-propagating high-temperature synthesis (SHS) method, and were characterized by N2 gas adsorption, X-ray diffraction, and scanning electron microscope, particle size distribution. Also, their photocatalytic activities were evaluated using methylene blue as a model organic compound. It was confirmed that the crystal structure of TiO2 prepared by SHS method was relatively homogeneous powder of rutile type. Optimum conditions for photocatalytic degradation of methylene blue under UV-C irradiation were methylene blue 9.5 ppm in solution and at amount of TiO2 added of 0.02 g/L. In addition, it was found that the photocatalytic activity for methylene blue degradation over the prepared TiO2 particles was positively related with BET specific surface area.</P>