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정창기(Jung Chang Ki),진성우(Jin Sung Woo),안희돈(Aha Hee Don),김헌영(Kim Heon Young),우승우(Woo Seung Woo) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
Seat belt system consists of mainly four restraining parts, retractor, D-ring, buckle and anchorage. These parts are required rules that are already legislated in many countries to satisfy tensile strength. As a rule belt load is about 800-900kgf in dynamic test and the load is distributed on each parts. So the parts must have enough strength enduring the load. We implemented computer simulation with MARC that is nonlinear static software and presented its simulation procedure and result. Because retractor is the major part which controls spool-in or out of webbing according to acceleration pulse in seat belt system, the deforn13tion of retractor base may cause a serious problem on its function in practical. After original model was evaluated, several alternatives were<br/> suggested to improve the deformation of the base caused by tensile force. Also the design of experiments was introduced to evaluate an optimum mounting hole location of base. Because many parts were directly related to this base and the base was too compact to modify the model, if<br/> possible we tried to find the optimum location which dose not affects parts related to base. Orthogonal array of L,(27) consisted of four variables and two levels. As these variables, Tie-bar position and translation of X, Y, Z were selected. As we got a final mounting hole location through out the main effect and interaction evaluation, designer can make a decision of the location, if the results arc verified trough out several tests. Finally, we got some simulation results of design modification and its reason why happen such deformation modes with the help of nonlinear static simulation, MARC.
대학유도선수의 최대운동에 따른 항산화효소, 과산화지질 및 호흡변인에 미치는 영향
김대영 ( Dae Young Kim ),김동제 ( Dong Je Kim ),권창기 ( Chang Ki Kwon ),이진 ( Jin Lee ),정선영 ( Sun Young Jung ) 대한무도학회 2011 대한무도학회지 Vol.13 No.3
본 연구의 목적은 최대운동에 따른 대학 유도선수의 항산화 효소(SOD, CAT, GPX), 과산화지질(MDA) 및 호흡변인(VE, VO2, VO2kg)의 변화와 차이를 알아보는 것이다. 12명의 건강한 대학교 남학생들을 대상으로 하였으며, 운동군 (n=6)과 통제군(n=6)으로 집단분류 하였다. 대상자들은 항산화효소와 과산화지질의 변화를 알아보기 위해 운동전 60분, 운동직후, 그리고 운동후 회복 60분에 총 3회에 걸쳐 채혈 하였다. 최대운동은 Bruce protocol을 이용한 트레드밀 점증부하 운동검사를 실시하였다. 본 연구의 결과 통제군과 비교하여 운동군에서 운동직후에 항산화지표인 SOD가 유의하게(40.82%, p=0.004) 증가하였다. 또한 운동직후 운동군에서 환기량(VE, 33.6%, p=0.001)과 산소섭취량의 절대치(VO2, 35.0%, p=0.001) 그리고 산소섭취량의 상대치(VO2kg, 20.7%, p=0.026)가 유의하게 증가하였다. 이러한 결과는 통제군에 비해 운동군에서 운동 중 그리고 운동 후에도 보다 많은 산소를 대사적으로 이용함에도 불구하고 항산화력(SOD)이 높게 나타난 것으로, 유도선수들의 규칙적인 운동 트레이닝에 의한 신체 적응과 방어능력의 향상에 기인한 것으로 생각된다. The purpose of this study was to investigate the differences and changes of antioxidant enzymes(SOD, CAT, and GPX), malondialdehyde(MDA), and respiratory variables(VE, VO2, and VO2kg) between judo athletes and sedentary men after stress test. To achieve the purpose, twelve healthy young males(exercise: n=6, control: n=6) were recruited for this study. All subjects carried on maximal all-out exercise in treadmill. Blood samples were collected at 60 minutes before exercise, immediately stop exercise and 60 minutes on recovery. The analysis of data revealed as followings: First, there were significant differences in the SOD levels between two groups only in post-exercise, but no significant differences in the other times. Second, there were no significant differences in the MDA levels between two groups in post-exercise. Third, there were significant differences in the respiratory variables(VE, VO2, and VO2kg) between two groups only in post-exercise, but no significant differences in the other times. In conclusion, present study suggested that Judo athletes were prone to injure by oxidative stress than control group, however they have stronger antioxidant preventive system than that of control group.