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강충식,손인덕 公州大學校스포츠科學硏究所 2001 스포츠科學硏究所論文集 Vol.- No.15
The purpose of this study is, through searching the number of attacks and the rate of successes according to the weight divisions of male and female athletes, to analyze and drive the elements that may effect on the results of competition. The objects of study are as follows: the 48 games from highschool 24 male and 24 female semifinals and finals during the 13th Teakwondo tournament sponsored by the President of Kyung-hee Univ. The 48 games from highschool 24 male and 24 female semifinals and finals during the 12th Teakwondo tournament sponsored by the minister of the Culture & Tour Ministery. The total 192 athletes participated in the above two competitions and 96 games were held. The analytical results of the whole games are as follows: First, it was shown that in the frequency of balchagi the total attack number of 96 men and 96 women is 3914, 4032, respectively and the average per capita is 40.77, 42, respectively. Men's balchagi are dolryeo chagi, naraechagi, dwitchagi, and their frequencies are 28.47, 4.77, and 3.50, respectively. Women's balchagis are also dolyeochagi, naraechagi, dwitchagi, and their frequencies are 31.58, 3.85, 3.21, respectively. Women tried more dolyeochagi than men, while men tried more naraechagi and dwitchagi than women did. Second, it was shown that in the number of attack and score according to each weight division women tried more naraechagi and dwitchagi than women did. Women scored total 367 points, which are 33 points more than the 334 points scored by men. As for men's weight divisions, these are featherweight, flyweight, pinweight, welterweight. Their points are 50, 47, 44 and 44, respectively. As for the women's weight divisions, these are welterweight, featherweight, lightwelterweight, and their points are 53, 52, and 49, respectively. Third, so far as the contents of male and female athletes' games are concerned, they didn't interest the audience at all; containment attacks were almost followed by connected balchagi. Furthmore, athletes defended the opponents' attacks monotonously by naraechagi and balchagi. Male athletes marked lower attacking abilities and scoring rates because of excessive diversional movement than female athletes did (scoring rate: female 9.10%, male 8.53%). Fourth, as for the contents of male and female winners or losers, winners marked 4085 times, and losers 3978 in attack abilites. The winners' balchagi success rate were as follows: they are dwihurigi(44.44%), naeryeochagi(20.63%), naraechagi(15.75%), dwitchagi(9.86%), dolryeochagi(9.56%) in the order, which were superior to losers, while losers are superior to winners only in dolgaechagi(16.66%). Fifth, according to the contents of weight division's games, there were no great differences in each weight division between game management and balchagi . Each weight division depended on upper attacks: male focused on prompt reaction, endurance, and power, while female focused on technic balchagi by using flexibility. In containment attacks, heavyweight class athletes played less but tried more balchagi than lightweight class athletes. Male athletes marked more balchagi than female athletes in frequency and scoring.
리플로우 시간에 따른 Sn-4Ag 솔더접합부 FEM 전단해석
유효선(Hyosun Yu),양성모(Sungmo Yang),손인덕(Indeok Son),최승준(Seungjun Choi) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
The evaluation on reliability of environment-friendly Pb-free solder and solder joints is very important. The correlation between interface reaction and mechanical properties of solder joints was confirmed in this study. And shear test are performed using SP(Share-Punch) tester. The shear strength tests on various reflow time are performed at 10,30,00 and 300sec. Tested specimens were examined in order to observe the failure mode on solder joints. The test result about solder joints of two different plate(Ni and Cu plate) are compared. Ni plate joints shown low IMC growth rate. The shear strength of Pb-free solder joints are higher than Sn-37 Pb solder joints, generally. In the case of Cu plate, shear strength of Sn-4Ag solder joints increased with reflow time. And solder joints with Cu contents are seems to similar in strength regardless of reflow time. on the other hand, in the case of Ni plate joints, shear strength of Sn-37Pb solder joints are similar to Sn-4Ag solder joints. Like Cu plate joints, solder joints with Cu contents are seems to similar in strength regardless of reflow time.