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金憲經,金基學,稻恒 敦,松浦義行,田中喜代次 慶北大學校 師範大學 體育學硏究會 1991 體育學會誌 Vol.19 No.-
Body fat generally has been considered to be liable to physical fitness and motor ability. However, very few studies have been done on the relationships between body fat and physical fitness and motor ability. The purpose of this study was to clarify the relationships between percent body fat(%fat) and selected motor ability elements. The subjects were seventy-nine boys and ninety-eight girls aged 10-11 years. Selected motor ability variables were grip strength, back strength, 50-meter dash, running long jump, vertical jump, belly grind, side step, trunk flexion, trunk extension, modified chinning, zigzag dribble, softball throw, and step test. Skinfold thickness was measured at three sites(triceps, subscapular, abdomen)using an Eiken-type caliper. Percent body fat was measured using a tetrapolar bioelectircal impedance plethysmograph(Selco 891). Negatively affected variables by %fat were those which involved muscular power and coordination, while muscular strength was positively related with %fat. Flexibility variables were found not affected by %fat. The subjects were grouped according to %fat in order to further examine the effects of %fat on motor ability. The groups were less than 10%fat(lean), 10∼20%fat(standard)and greater than 20%fat(obese) in boys, and less than 15%fat(lean), 15∼25%fat(standard)and greater than 25%fat(obese) in girls. The results of comparision among groups clearly indicated that the obese groups were poorer in muscular power and coordination but greater in musular strength. The body fat may be one important factor that affects on many motor ability elements. The relationships between motor ability and degree of fatness seem to be rather complicated, and a great deal of data should be accumulated for analysis of influence of body fatness.
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金憲經(HunKyungKIM),金基學(KiHackKIM) 한국체육학회 1996 한국체육학회지 Vol.35 No.1
Gender differences in physical fitness have been reported in many studies. However, little information is available on physical fitness in obese boys and girls. The purpose of this, study was to investigate the differences in physical fitness between obese boys and girls. The subjects were 51 obese boys and 64 obese girls aged 12.0-14.9 years. Eighteen physical fitness items were tested and skinfold thickness was measured at six sites. Bioelectrical impedance(Z) was measured using a tetrapolar impedance plethysmograph(Selco SIF-891). Body density was calculated from impedance index and triceps skinfold thickness, and it was converted to percent body fat using the formula of Brozek et al. The results of the comparative study clearly indicated that the obese boys were significantly superior in handball throw, back strength, grip strength and many other variables, but were inferior in trunk extension, leg balance and trunk flexion. The relative values of obese girls to obese boys in selected physical fitness elements were 67.50% for handball throw, 73.23% for back strength, 136.45% for leg balance, and 332.50% for trunk flexion. Regression analysis was used to develop the equation for predicting performance score from FFM or %fat. The Precision of regression equation was evaluated by the R and SEE. R ranged from 0.846 to 0.404 in the obese boys and from 0.528 to 0.404 in the obese girls. To analyze the factorial structure for these boys and girls, principal factor analysis was applied to the correlation matrix which was calculated with 18 variables, and then six factors in obese boys and five factors in obese girls were extracted. From these results, it was confirmed that the gender differences in physacal fitnss of the obese boys and girls seem to be rather complicated. A great deal of data should be accumulated for more detailed analysis on gender differences in middle school obese boys and girls.
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김헌경(Hun Kyung Kim),김기학(Ki Hack Kim),김정태(Jeong Tae Kim) 한국발육발달학회 1994 한국발육발달학회지 Vol.2 No.1
9-11세의 國民學校 男子 118명을 對象으로하여, 肥滿으로 判定된 24명을 肥滿群으로, 나머지 94명을 非肥滿群으로 분류하여 양군간의 비교로부터 얻어진 결과는 다음과 같이 요약할 수 있다. 1. 肥滿群과 非肥滿群의 形態를 비교한 결과, 身長, 坐高, 除脂肪의 3항목에서는 統計的인 有意差가 나타나지 않았지만(P$gt;0.05), 나머지 全 項目애서는 有意差(P$lt;0.07)가 나타나 肥滿群이 높은 값을 나타내고 있다. 2. 1,000m달리기, 50m달리기, 수직뛰기. 도움닫기 멀리뛰기, 윗몸일으키기, 반복옆뛰기의 6항목에서 肥滿群과 非肥滿群間에 有意差(P$lt;0.05)가 나타나 肥滿群의 성적이 뒤떨어지는 경향을 보이고 있다. 3. 肥滿群의 경우는, 項目간의 차가 심하고, 특히 體重을 負荷로하여 身體를 垂直方向 이나 水平方向으로 移動시키는 能力을 필요로 하는 項目의 성적이 뒤떨어지는 경향을 보이고 있다. 4. 肥滿群의 경우, 瞬發力 및 全身持久性, 平衡性의 體力要素가 현저하게 뒤떨어지는 경향을 보이고 있다. 이와같은 결과로부터, 肥滿者를 지도 할 때에는 이러한 體力要素를 향상시키기 위한 運動指導가 필요하다고 판단되었다. 5. 肥滿者로 判定된 全員이 劃一的으로, 體力이 뒤떨어 진다고는 할 수 없는 결과로부터, 肥滿者의 運動指導에는 全體指導 보다는 個人差를 고려한 個別指導의 중요성이 시사되었다. Excess fatness exerts a negative effect on physical fitness, particularly in tasks requiring movement or projection of the entire body. However, little information is available on physical fitness in elementary school boys. The purpose of this study was to clarify characteristics of selected physical fitness in obese boys in comparison with non-obese boys. The subjects were 118 boys aged 9-11 years. Thirteen physical fitness items were tested and skinfold thickness was measured at six sites. Bioelectrical impedance(Z) was measured using a tetrapolar impedance plethysmograph(Selco SIF-891). Body density was calculated from the formula of Kim et al. The results of the comparative study clearly indicated that the obese group was significantly inferior in 1,000m run, 50m dash, running long jump, vertical jump and many other variables, but was superior in trunk extension. To analyze the factorial structure for these boys, principal factor analysis was applied to the correlation matrix, which was calculated with 13 variables, and then four factors were extracted. The obese group was significantly inferior in muscular power and total body endurance and balance to the non-obese group. From these results, it was confirmed that excess body fat could be one of the most important factors that affecting the state of many physical fitness elements in obese boys. However, the relationships between physical fitness and the degree of fatness seem to be rather complicated. A great deal of data should be accumulated for more detailed analysis on the influence of the excess body fat in obese boys.
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내열강 마찰용접재의 ISM에 의한 크리프 수명예측에 관한 연구
김헌경(HUN-KYOUNG KIM),김일석(IL-SEOCK KIM),이연탁(YEON-TAK LEE),공유식(YU-SIK KONG),오세규(SAE-KYOO OH) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.2
In this paper, the real-time prediction of high temperature creep life was carried out for the friction welded joints of dissimilar heat resisting steels (SUH3-SUH35). Various life prediction methods such as LMP (Larson-Miller Parameter) and ISM (initial strain method) were applied. The creep behaviors of those steels and the welds under static load were examined by ISM combined with LMP at 500, 600 and 700℃, and the relationship between these two methods was investigated. A real-time creep life (tr, hr) prediction equation by initial strain (ε0, %) under any creep stress (σ, ㎫) at any high temperature (T, K) was developed as follows : tγ=α ε0<SUP>β</SUP>σ<SUP>-1</SUP> where, ø=16 : α=10<SUP>51.412-0.104T+5.375×10<SUP>-5</SUP>T²</SUP>, β=-83.989-0.180T-9.957×10<SUP>-5</SUP>T², ø=20 : α=1069.910-0.146T+7.744×10-5T², β=-51.442+0.105T-5.595×10-5T² for SUH3-SUH35 friction weld of ø=16㎜ and ø=20㎜, respectively.
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자연과학편 : 여자중학생(女子中學生)의 체력(體力)에 관련(關聯)하는 제요인(諸要因)의 검토(檢討)
김헌경(HunKyungKim),김기학(KiHackKim) 한국체육학회 1994 한국체육학회지 Vol.33 No.3
Physical activity, nutrition and dietary habit are hypothesized to be major factors that may have an influence on physical fitness. This study was designed to determine what factors one’s daily living conditions are associated with physical fitness. Three hundred and five girls, aged 12 to 14 years, were used in this study. A questionnaire consisting of 49 items was administered. The questionnaire was divided into categories including condition of physical exercise, dietary condition, rest condition, and maturation. Nineteen physical fitness variables were tested and skinfold thickness was measured at six sites. Bioelectric impedance(Z) was measured using a Selco SIF-891 impedance analyzer. Body density was calculated from the formula of Kim et al. To analyze the factorial structure in girls, principal factor analysis was applied to the correlation matrix which was calculated with 19 variables, and then six factors were extracted. In order to examine the effect of daily living conditions on physical fitness, the: degree of contribution of each factor was calculated. The %fat was found to have a greater effect: on the muscular power factor, body bulk on the muscular strength factor, the amount of exercise on the body endurance factor, home activity on the flexibility factor, body linearity on the muscular endurance factor, and maturation on the balance factor. From these results, it might be suggested that physique, %fat and eating habits are major factors that affect physical fitness of girls. The %fat was found to be on important factor that affects many physical fitness elements. The relationships between physical fitness and daily living conditions seem to be rather complicated, and a great deal of data should be accumulated for the analysis of influence of daily living condition on girls.
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