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안석환(Seok-Hwan Ahn),남기우(Ki-Woo Nam),정정환(Jeong-Hwan Jeong),김용운(Yong-Un Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Fracture behaviors of pipes with local wall thinning are very important for the integrity of nuclear<br/> power plant. In pipes of energy plants, sometimes, the local wall thinning may result from severe<br/> erosion-corrosion (E/C) damage. However, the effects of local wall thinning on strength and fracture<br/> behaviors of piping system were not well studied. In this paper, the monotonic bending tests were<br/> performed of full-scale welded and unwelded carbon steel pipes with local wall thinning. A monotonic<br/> bending load was applied to straight pipe specimens by four-point loading at ambient temperature<br/> without internal pressure. The observed failure modes were divided into four types; ovalization, crack<br/> initiation/growth after ovalization, local buckling and crack initiation/growth after local buckling. Also,<br/> the strengths of welded and unwelded piping system with local wall thinning were evaluated.
2011 대구세계육상선수권대회 남자 멀리뛰기 경기의 운동학적 분석
서정석 ( Jung Suk Seo ),우상연 ( Sang Yeon Woo ),김용운 ( Yong Woon Kim ),남기정 ( Ki Jeong Nam ),박용현 ( Young Hyun Park ),김호묵 ( Ho Mook Kim ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5
The long jump motion of 8 finalist of men`s long jump of IAAF World Championships Daegu 2011 were analysed and the kinematic characteristics of the technique were investigated. The kinematic characteristics of long jump motion of 8 finalist were as follows. In the run-up phase, the average length of 3, 2, and 1 stride were 2.21±0.08 m, 2.46±0.18 m, and 2.19±0.16 m, respectively. The change in the height of the center of gravity was 0.09 ± 0.02 m. The average velocity of 3, 2, and 1 stride was 10.37±0.32 m/s, 9.63±0.32 m/s, and 10.69±10.69 m/s, respectively. In the take-off phase, the horizontal velocity, the vertical velocity, the reduction of horizontal velocity was 9.00±0.37 m/s, 3.04±0.27 m/s, and 1.69±0.34 m/s, respectively. The minimum knee angle and the take off angle was 157±6.57° and 18.5±2.24°, respectively. In the flight phase, the flight time and the maximum height of the center of gravity was 0.82±0.05 s, and 1.70±0.10 m, respectively. In the landing phase, the landing length was 0.51±0.06 m. The body angle, the knee angle, and the hip angle was 71±20.93°, 136±19.19°, and 85±9.58°, respectively. The kinematic characteristics of long jump motion with good record were shown as follows, The reduction of the horizontal velocity in the take-off phase was minimized while the velocity of the run-up were maximally maintained, The vertical velocity in the take-off phase was increased with rapidly extended knee and the high center of gravity.
2011 대구세계육상선수권대회 여자 멀리뛰기 경기의 운동학적 분석
김호묵 ( Ho Mook Kim ),우상연 ( Sang Yeon Woo ),김용운 ( Yong Woon Kim ),남기정 ( Ki Jeong Nam ),박용현 ( Yong Hyun Park ),서정석 ( Jung Suk Seo ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5
The long jump motions of 8 finalists in the women`s long jump at the IAAF World Championships, Daegu 2011 were analyzed, and the kinematic characteristics of their techniques were investigated. The kinematic characteristics of the long jump motion of the 8 finalists were as follows. In the run-up phase, the length of the 2 stride was 108 ± 6.92% that of the 3 stride. The length of the 1 stride was 91 ± 5.78% that of the 2 stride. The change in the height of the center of gravity was 0.07 ± 0.03 m. The maximum velocity during the run-up phase was 9.44 ± 0.13 m at the 1 stride. In the take-off phase, the horizontal velocity, vertical velocity, reduction in horizontal velocity were 7.80 ± 0.15 m/s, 2.96 ± 0.14 m/s, and 1.64 ± 0.19 m/s, respectively. The minimum knee angle and take-off angle were 151 ± 8.89° and 20.7 ± 1.03°, respectively. In the flight phase, the flight time and maximum height of the center of gravity were 0.78 ± 0.03 s, and 1.60±0.05 m, respectively. In the landing phase, the landing length was 0.50 ± 0.07 m. The trunk angle, knee angle, and hip angle were 74 ± 18.75°, 131 ± 10.45°, and 82 ± 9.03°, respectively. The kinematic characteristics of the motion of a good long jump were as follows. The reduction in the horizontal velocity in the take-off phase was minimized, and the maximum velocity of the run-up was maintained. The vertical velocity in the take-off phase was increased using a rapidly extended knee and high center of gravity.
2011 대구세계육상선수권대회 남자 세단뛰기 경기의 운동학적 분석
우상연 ( Sang Yeon Woo ),서정석 ( Jung Suk Seo ),김호묵 ( Ho Mook Kim ),김용운 ( Yong Woon Kim ),최성범 ( Sung Bum Choi ),남기정 ( Ki Jeong Nam ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5
The purpose of this study was to analyze the kinematics of the men`s triple jump at the 2011 Daegu World Championships by comparing the results to those at the 2009 Berlin World Championships. The kinematic data were gathered from two steps before take off to the landing using a seven panorama system, and these data were divided into 3 phases for 8 participants. The average jump for the finalists was longer in the Daegu championships (17.46 m) than in the Berlin championships (17.28 m). The longest jump record was increased by 23 cm. The step was the longest at 36% of the total distance, followed by the hop at 30% and the jump at 34%. The first and third phases were substantially longer than the second phase (the step). The horizontal speed at take-off increased in the order hop, step, and jump. Overall, in comparison with the results from Berlin, the horizontal velocity increased, the vertical velocity decreased, and the landing angle decreased.
2011 대구세계육상선수권대회 여자 세단뛰기 경기의 운동학적 분석
우상연 ( Sang Yeon Woo ),서정석 ( Jung Suk Seo ),김호묵 ( Ho Mook Kim ),남기정 ( Yong Woon Kim ),최성범 ( Sung Bum Choi ),김용운 ( Ki Jeong Nam ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5
The purpose of this study was to analyze the kinematics of the women`s triple jump event at the 2011 Daegu World aChmpionships by comparing them to those of the 2009 Berlin World Championships. The kinematic data were gathered from two steps before take off to the landing using a 7-camera panorama system. The data were then divided into 3 phases for each of the 8 participants. Similar average results were found the final contestants in the Daegu and Berlin championships, 14.58 m and 14.51 m, respectively. The first step had a relatively short length percentage (29%) compared to the hop and jump (36% and 35%, respectively). At the take off, the horizontal velocity was the lowest for the step, followed by the hop and jump. These results were different from the results for the men, who had an order of hop, step, and jump. Overall, in a comparison of the Daegu and Berlin participants, the vertical speed at take off for the three events was reduced compared to the horizontal speed.