步速變化에 따른 미끄러짐의 생체역학적 연구

서국웅,윤양진,서국은,이중숙,김용재,이언석,이훈식 釜山大學校 附設 體育科學硏究所 1992 體育科學硏究所 論文集 Vol.8 No.-

The purpose of this study was to analyze walking steps to prevent unnecessary energy consuming and prevention of injury from sliding when someone was walking. The questionnaire, high speed video system, E.M.G. system, and force platform system were used to analyze sliding mechanism in biomechanical perspective. Several results were found as following: 1. According to questionnaire regarding sliding, 93.3% of participants have sliding experiences. People have sliding experiences by greasy floor(48.4%) and obstacle (22.5%). Sliding types were found from different kinds of shoes such as sneakers (48.8%) and boots (34.2%). The results were presented as following 44.6% of participants were fall down front direction and 40.3% of people fell down rear side. 2. According to the high speed video system analyzer, step sliding increased with increasing step speed from distance and acceleration speed experiment with 80 steps/min, 100 steps/min, 120 steps/min. Also, the most sliding were occurred with sneakers, boots, and bare feet as order. 3. According to E.M.G. test results, the vastus lateralis M., the vastus medialis m., and the tibialis anterior m. of electric action potential presented strongly when participants fell front, rear, and right side. The vastus lateralis m. and the tibialis anterior m. of electric action potential presented strongly when someone fell left side, but the vastus medialis m. and the gastrocnemius m. of electirc action potential presented as weaker. 4. According to the force platform test results, the most big change of floor antipower of x-axis presented when someone fell the left side. The most of big change of floor antipower of y-axis presented when someone fell down rear side. The most of big change of floor antipower of z-axis presented similarly when someone fell the front, rear, left, and right side.

인조 합성 테니스 스포츠 바닥재의 운동생리학적 분석

서혜림,박승범,서국웅,이재규,서혜진 釜山大學校 附設 體育科學硏究所 1999 體育科學硏究所 論文集 Vol.15 No.-

The purpose of this study was to investigate the changes of heart rate(HR), Ventileation, Carbon elimination, Oxygen take, Oxygen uptake per weight, Respiratory Exchange ratio and Breath frequency. To do this, we selected three Synthetic tennis playing surface(A:Synpave Rebound Ace Sample, B:Synpave Rebound Classic Sample, C:Synpave Spring Sample) by using of Austrilian Tennis Open. The result of this study is as follows 1. In the changes of heart rate(HR, beats/min), it is not significantly in a stastics. Tennis playing surface sample A was shown a little bit higher than sample C, sample C was shown a little bit higher than sample B, 2. In the changes of Ventileation(VE, 1/min), it is not significantly in a stastics. Tennis playing surface sample B was shown a little bit higher than sample A·C, sample C was shown a little bit higher than sample A, 3. In the changes of Carbon elimination (Vco2, ml/min), it is not significantly in a stastics. Tennis playing surface sample A was shown a little bit higher than sample B·C, sample B was shown a little bit higher than sample C, 4. In the changes of Oxygen take (Vo2, ml/min), it is not significantly in a stastics. Tennis playing surface sample A was shown a little bit higher than sample B·C, sample B was shown a little bit higher than sample C, 5. In the changes of Oxygen uptake per weight(Vo2/wt, ml/kg/min), it is not significantly in a stastics. Tennis playing surface sample A was shown a little bit higher than sample B·C, sample B was shown a little bit higher than sample C, 6. In the changes of Respiratory Exchange ratio(RER, Vco2/Vo2), it is not significantly in a stastics. Tennis playing surface sample A was shown a little bit higher than sample B·C, sample C was shown a little bit higher than sample B, 7. In the changes of Breath frequency (BF, fre/min), it is not significantly in a stastics. Tennis playing surface sample B was shown a little bit higher than sample A·C.

임팩트시 테니스 라켓 재질의 차이에 따른 근전도 분석

윤양진,유국종,서국웅,정미라,강영택,이훈식,서국은 釜山大學校 附設 體育科學硏究所 1999 體育科學硏究所 論文集 Vol.15 No.-

The purpose of this paper is to select 7 male athletes and female athletes of high school, and to compare their active potential differences of upper arm muscles according to characteristic of a racket. the results obtained are as follows: 1. According to the accumulative distribution rate of racket material, graphite and wood material show better efficiency in case of brachio radialis muscle of male athletes, but the racket material shows no constant efficiency in brachii radialis muscle of female athletes. In case of flexor carpi radialis muscle, wood material provides better efficiency only for male athletes. In case of triceps brachii muscle, wood material gives better efficiency to males athletes and steel material gives better efficiency to females athletes. Especially in case of biceps brachii muscle, neither male nor female athletes are influenced by racket materials at impact. 2. In the muscle load rate according to racket material, wood has the highest muscle active potential and graphite has the lowest active potential. Therefore, graphite is thoght to be better in the efficiency of muscle load rate.

들기자세 유형별 L₄-L?의 근전도 분석 : At the Base Knee Angle 무릎각도를 중심으로

서국웅,노석규,윤양진,정미라,이훈식,박승범 釜山大學校 附設 體育科學硏究所 1998 體育科學硏究所 論文集 Vol.14 No.-

This research is to find out the most suitable lifting posture and to provide fundamental data for preventing usual injuries. To do this, we select five male graduates and five female graduates of P university, analyze their muscular actions in terms of posture types, measure the limit value of weight lifting by comparing each lifting posture type(knee angle 40˚, 80˚, 180˚) with action amplitudes of two parts of erector spinae muscle, and draw our conclusion as follow ; 1. In case of every lifting posture(that is, knee angle 40˚, 80˚, 180˚), females have higher muscular conductivity value in L⁴-L? of right erector spinae muscle than males(p<.001), but in L⁴-L? of left erector spinae males has higher muscular conductivity value than females(p<.001). 2. Males show lower degree of change in muscular conductivity value from 10kg to 25kg weight lifting. 3. Females show gradually increasing degree of change in muscular conductivity value according as weight lifting is heavier. 4. Males show the constant muscular conductivity action of average 50∼110㎶ in the L⁴-L? in case of each lifting posture, knee angle 40˚, 80˚, and 180˚. 5. Females also show the constant muscular conductivity action of average 100∼200㎶ in the L⁴-L? in case of each lifting posture, knee angle 40˚, 80˚, and 180˚. But they show more active muscular conductivity in more than 15kg weight lifting, IOSHIC permission load value. In short, in case of males, weight lifting up to 25kg has little effect on erector spinae muscle but in case of females, weight lifting from more than 15kg has gradual effect on erector spinae muscle. Therefore, the muscular conductivity values of various posture types(by knee angle)are to be identified according to weight lifting steps.

음성의 특성이론과 소음 환경에서의 Intelligibility에 관한 연구

서국웅,강영택 釜山大學校 附設 體育科學硏究所 1996 體育科學硏究所 論文集 Vol.12 No.-

This study was to determine the type of spoken material that can be heard best in a noisy environment There were 6 subjects of graduate school students of P. university. Intelligibility were three different types of tests to measure intelligibility in a noisy environment. We needed a radio and desks. The radio located behind them about 12 inches from the back of their head. 1. The length of the word influnced its Intelligibility by the longer the word, the more readily it is correctly identified. 2. The listener is able to identify a long word by hearing portion of it, particularly familiar, highly probable word, whereas missing one syllable of a short word is more likely to prevent the identification of the entire word. 3. Influencing the Intelligibility of speech in noise is the context in which the words are heard. 4. Situations may arise with a noise level so greut that Certain speech sounds may be confused. 5. We have to make good biomechanical listening environment for Intelligibility in a noisy environment. 6. We can prevent a noisy environment to use earplug and to getrid of noisy material

효과적인 하중운반체계의 동역학적 연구

서국웅,양점홍,윤양진,황영성,이중숙,김용재,유경복 釜山大學校 附設 體育科學硏究所 1994 體育科學硏究所 論文集 Vol.10 No.-

The purpose of this study was to get the quantitative data of effect of two different load carrying system on Kinematics and Kinetics. The subjects for the research were 2-adults. The mechanism of each load carrying pattern was measured by a motion analylizer, a forceplatform and EMG system. The conclusions were get from Kinematics variables and Kinetics variables. 1. It was not effected at the vertical reaction force(Fz) of left, right foot according to the big value the 1st peack of 10kg, 15kg fore, back-pack carrying system, 20 kgw, 30 kgw back-pack carrying system in walking. But it was effected at the vertical reaction force(Fz) on 30 kgw back-pack carrying system in walking. 2. It was not effected at the Anterior-Posterior reaction force(Fx) of left, right foot according to high value of the 1st peack on 10 kgw, 15 kgw fore, back-pack carrying in walking. But, it was effected on the 20 kgw, 30 kgw only back-pack carrying in walking. 3. It was effected at the left-right reaction force(Fy) of left-right foot according to the big value of the 2nd peak on 10 kgw, 15 kgw fore-backpack carrying system in walking. It was more effective than 20 kgw, 30 kgw back-pack carrying system in walking. There was not disorder force(Fx) on 10 kgw, 15 kgw fore-backpack carrying system in walking. 4. Analysis of computer graphic, on the pack carrying system in walking. It was efficient in 10 kgw, 15 kgw fore-backpack carrying system in walking. But, it was efficient on 20 kgw, 30 kgw backpack carrying in walking. Castrocnemius, Tibialis anterior, Vastus lateralis, Vastus medialis, are stressed to bend their body foreward. So it occurred fatigue fast, injured muscles and joints. 5. Extension anyles and flection angles of the knee joint and the hip joint on 10 kgw, 15 kgw fore-backpack carrying system in walking showed less than those on 20 kgw, 30 kgw backpack carrying system in walking. It was efficient on the 10 kgw, 15 kgw fore-backpack carrying system in walking. 6. Magnitudes of EMG of Castrocnemius, Tibialis anterior, Vastus lateralis, Vastus medialis, were increased according to increasing weight road and were decreased on the 20 kgw, 30 kgw back-pack carrying system in walking.

중량물 운반시 하지 근육의 근전도 분석

서국웅,이훈식,정미라 釜山大學校 附設 體育科學硏究所 1998 體育科學硏究所 論文集 Vol.14 No.-

This study is to find out the most suitable models of load carriage and to provide fundamental data for preventing usual injuries. To do this, we select five male graduates and five female graduates of P university, analyze their amplitude chages of electromyographic signals in front carring task, measure the limit value of load carriage by comparing each levels(5kg, 10kg, 15kkg, 25kg) with action amplitudes of four parts of both lower limb muscle. 1. In case of 5kg ·10kg ·15kg carriage, males have higher muscular conductivity value of lower limb than females. 2. In case of 20kg ·25kg carriage, females have higher muscular conductivity value of lower limb than males. 3. Injury would often occurred when permission load value of females in over 15kg carriage.

人體와 Racket 움직임의 生體力學的 分析 : Tennis Forehand Flat, Slice, Drive, Volley를 중심으로

서국웅 釜山大學校 附設 體育科學硏究所 1991 體育科學硏究所 論文集 Vol.7 No.-

The purpose of this study is to give some help to the beginners and instructors understanding the importance and biomechanics of forehand flat stroke, slice stroke, drive stroke and volley and physicological change of muscles at this time. To carry out this study, one man was selected as subject, who is skilled amateur player. And many pictures of the subject attached E.M.G. wer taken with 16㎜ high speed camera(250fps) and they were analyzed with a film motion analyzer on the phase of backswing, forewaedswing and followthrow. As results, this research showed follow: 1. Extending the knee joint of the right(left) leg, one transfers weight to the left(right) leg for the greater torque as soon as all the motions of the forehand stroke's flat, slice and drive was impacted. 2. The backswing or the follow through of the forehand slice stroke was shown shorter than the forehand flat and drive stroke. 3. When the motion of the follow through was performed, the knee joint of the rotational axis should be moved in a state of nonextention right after impact, and the flextion of the elbow joint and the extention of the knee joint should be slowly performed at the last of the followthrough. 4. E.M.G. oscillation of the forehand drive stroke was shown higher than one of the forehand flat and slice stroke, and E.M.G. oscillation of the volley motion was long continued. 5. It was shown that there were more opportunity to have tennis elbow because there was greater muscle fatigue of arm in forehand drive stroke than forehand flat and slice stroke.

에어로빅 댄스 Kick 동작의 운동역학적 분석

서국웅,이훈식,윤양진,정미라,박승범 釜山大學校 附設 體育科學硏究所 1998 體育科學硏究所 論文集 Vol.14 No.-

The purpose of this study is to investigate the front and side Maximum Vertical Ground Reaction Force's of Knee-up, long-kick and high-kick, the effect of them speed rate on Maximum Vertical Ground Reaction Force, and the damage factor caused by them, and to provide useful data for ordinary people or athlete aerobic programs. The result of this study is as follows ; 1. Maximum Vertical Ground Reaction Force is not significant between the front and the side. 2. Maximum Vertical Ground Reaction Force is significant between differences of speed rate. 3. Maximum Vertical Ground Reaction Force, speed and direction being equal, is significant according to the motion types: knee-up, long-kick and high-kick. 4. The possibility of causing damage is the highest when Maximum Vertical Ground Reaction Force is more than 20BW/sec. 5. High-kick, which needs quick and heavy motion, is considered not be fit for beginners. 6. Load-rate must be lowered by choosing adequate speed rate and motion type, and even in the career of skilled athletes, enough exercise and muscle strength training of legs are necessary in doing aerobic.

중량단계별 상지근육의 근전도 패턴 분석

서국웅,윤양진,이훈식,정미라,이창민 한국운동역학회 1999 한국운동역학회지 Vol.9 No.1

본 연구는 중량을 들고 걷는 자세에서의 근육의 전위 활동을 분석하기 위해 P대학 체육학과 남 · 여 대학원생 중 오른손 사용자 5명에게 각각 5㎏, 10㎏, 15㎏, 20㎏, 25㎏의 중량물 운반시의 좌 · 우 상지의 각각 4개 부위에 대한 근육 전위 활동을 측정하여 비교 분석함으로써 성인 남 · 여에 있어서 적절한 중량들기의 한계치를 파악함은 물론, 중량들기로 인한 일상의 상해예방을 위한 기초자료를 제공하고자 하였다. 분석결과 5 · 10 · 15 · 20 · 25㎏의 중량물 운반시 상지근 대부분의 근육의 전위 활동은 여자가 남자보다 높게 나타났으며 중량이 무거워질수록 남자는 좌측 상완이두근과 상완요골근, 여자는 우측 상완이두근과 상완요골근이 주동근으로 사용되었고 여자에 비해 남자의 좌측 주동근의 근육 전위 활동이 높게 나타나 좌 · 우 평형유지에 힘든 요인으로 분석되었다. 또한 중량이 무거워질수록 여자 우측 요골근의 근육 전위 활동이 여자 상완요골근과 남자 좌 · 우측 상완요골근에 비해 높게 나타난 것은 몸 바깥쪽의 근 사용으로 효율적인 중량물 운반이 이루어지지 않음으로써 허리에 부담을 주거나 편중된 근 사용으로 인한 상해유발과 국소적인 근피로 가능성이 높은 것으로 나타났다. 중량들기 적정한계치는 남자는 25㎏, 여자는 15㎏으로 나타났다. This study is to investigate the most suitable models of load carriage and to provide fundamental data for preventing usual injuries. we selected five male graduates and five female graduates of P university, analyze their amplitude chages of electromyographic signals in front carring task, measure the limit value of load carriage by comparing each levels(5㎏, 10㎏, 15㎏, 20㎏, 25㎏) with action amplitudes of four parts of both arm muscle. In case of 5㎏ · 10㎏ · 15㎏ · 20㎏ · 25㎏ carriage, females have higher muscular conductivity value in most muscles of both arm than males. Males is used agonistic muscle left biceps brachii and musculi brachioradalis , also females is used agonistic muscle right biceps brachii and musculi brachioradalis. Males have higher muscluar conductivity value in left agonistic muscle than females according as load is heavier, it is shown to be to difficult the male to keep balance. The heavier load, the higher muscluar conductivity value of right musculi brachioradalis in females than musculi brachioradalis in females and musculi brachioradalis at both side in males. The result of as shown above, Since the way of load carriage is not effective caused by using the muscle at outside of the body. The localized muscle fatigue and injury would often occurred caused of taken overload at waist or using the specific muscle.