http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Comparison of Biomechanical Characteristics for the Skill Level in Cycle Pedaling
이근혁,김재정,강성선,홍아름,소재무 한국운동역학회 2016 한국운동역학회지 Vol.26 No.1
Objective: This study aimed to compare biomechanical data between elite and beginner cyclists during cycle pedaling by performing a comparative analysis and to provide quantitative data for both pedaling performance enhancement and injury prevention. Methods: The subjects of this study included 5 elite cyclists (age: 18 ± 0 years, body mass: 64.8 ± 9.52 kg, height: 173.0 ± 4.80 cm) and 5 amateur cyclists (age: 20 ± 0 years, mass: 66.6 ± 2.36 kg, height: 175.6 ± 1.95 cm). The subjects pedaled on a stationary bicycle mounted on rollers of the same gear (front: 50 T and rear: 17 T = 2.94) and cadence of 90. The saddle height was adjusted to fit the body of each subject, and all the subjects wore shoes with cleats. In order to obtain kinematic data, 4 cameras (GR-HD1KR, JVC, Japan) were installed and set at 60 frames/sec. An electromyography (EMG) system (Telemyo 2400T, Noraxon, USA) was used to measure muscle activation. Eight sets of data from both the left and right lower extremities were obtained from 4 muscles (vastus medialis oblique [VMO], vastus lateralis oblique [VLO], and semitendinosus [Semitend], and lateral gastrocnemius [Gastro]) bilaterally by using a sampling frequency of 1,500 Hz. Five sets of events (0°, 90°, 180°, 270°, and 360°) and 4 phases (P1, P2, P3, and P4) were set up for the data analysis. Imaging data were analyzed for kinematic factors by using the Kwon3D XP computer software (Visol, Korea). MyoResearch XP Master Edition (Noraxon) was used for filtering and processing EMG signals. Results: The angular velocity at 360° from the feet was higher in the amateur cyclists, but accelerations at 90° and 180° were higher in the elite cyclists. The amateur cyclists had greater joint angles at 270° from the ankle and wider knee joint distance at 0°, 180°, and 360° than the elite cyclists. The EMG measurements showed significant differences between P2 and P4 from both the right VLO and Semitend. Conclusion: This study showed that lower body movements appeared to be different according to the level of cycle pedaling experience. This finding may be used to improve pedaling performance and prevent injuries among cyclists.
골유도재생술시 그물형 티타늄막의 천공수가 골형성에 미치는 영향
이근혁,권영혁,박준봉,허익,Lee, Keun-Hyuk,Kwon, Young-Hyuk,Park, Joon-Bong,Herr, Yeek 대한치주과학회 2004 Journal of Periodontal & Implant Science Vol.34 No.2
This study was performed to evaluate bone formation in the calvaria of rabbit by the concept of guided bone regeneration with titanium mesh membrane. Two different titanium meshes with varying number (353, 565) of pore were utilized in the study. Two surgical sites(T353, T565) were evaluated about whether or not the number of pore may have effect on the bone formation. The animal was sacrificed at 10days, 3 weeks, 6weeks, and 8 weeks after the surgery. Non-decalcified specimens were processed for histologic analysis. 1. Titanium mesh was biocompatible and capable of maintaining the spacemaking. 2. At 3 weeks, 6 weeks, and 8 weeks after GBR procedure, bone formation was more in the T353 site than in the T565 site. 3. Soft tissue layer above the regenerated bone was better developed in the T565 site. 4. There was no difference between two membranes in bone maturity with time. Within the above results, titanium mesh with lesser pore in number might be recommended for the early bone formation.
골프스윙 시 족저압의 변화가 체중이동에 미치는 단일사례연구
이근혁,소재무,박혜림,김재정,임우택,안용환 한국골프학회 2013 골프연구 Vol.7 No.1
연구의 목적은 최00 프로를 사례로 족저압의 변화가 체중이동 패턴에 어떠한 영향을 주는지 분석하여 족저압력과 스윙구조와의 연관성을 규명하는데 있다. 이를 위해 LPGA Member 최oo(연령 27세, 신장 167cm, 체중 58kg)프로 1명을 피험자로 선정하고 Science & Motion사의 SAM BalanceLab을 이용하여 발에 가해진 압력 분포와 무게중심 이동경로를 구하였다. 결과 분석을 위해 어드레스(AD), 백스윙 탑(BST), 다운스윙(DS), 임팩트(IP)의 이벤트를 설정하였고 사전 사후로 비교하였으며 다음과 같은 결론을 얻었다. 프로골퍼 최00은 어드레스시 Toe쪽에 위치해있던 족저압을 Heel쪽으로 이동시킨 결과 골프스윙 시 체중이동의 패턴 변화에 영향을 미치고 있다. The purpose of this study was to find the correlation between plantar pressure and golf swing by analyzing the effect of changes in plantar pressure on weight transfer patterns through professional golfer Choi’s case. LPGA member Choi(age 27, height 167cm, weight 58kg) was chosen as a subject of the study and SAM BalanceLab from Science & Motion was used to obtain pressure distribution applied on the feet and moving path of the center of mass. Address(AD), top of backswing(BST), downswing(DS), and impact(IP) were chosen as events to analyze the result, comparisons were made before and after the events, and the following results were obtained. Professional golfer Choi moved plantar pressure from her toe towards her heel during the address which effected the change in weight transfer pattern of the golf swing.
프로골퍼의 4m 퍼팅시 퍼터 헤드형태에 따른 운동학적 특성
이근혁 ( Geun Hyuk Lee ),소재무 ( Jae Moo So ) 한국운동역학회 2013 한국운동역학회지 Vol.23 No.4
The objective of this study is to help golfers to select adequate putters and to provide golfers basic scientific data for improving athletic performance by showing differences of kinematic variables according to the shape of putter head. In this research three right-handed male pro-golfer who are listed at KPGA were studied and three video camera (GR-HD1KR, JVC, Japan) were used and recording speed was 60 frame/sec during the research. In this study kinematic variables were calculated using Kwon3D XP program and analysed on the 4 events and 3 phases. This study showed the following results : (1) The swing of heel-toe putter showed longer time than that of face balanced putter, and there are statistical significant difference of kinematic variables of each objective (2) As of the trajectory of putter head, heel-toe putter showed more approximating curve trajectory than that of inbetween, face balanced putter on the X-axis (3) heel-toe putter showed longer distance follow-through than that of other putters by statistically significant difference on the Y-axis (4) Heel-toe putter showed longer distance swing trajectory over the ground than that of other putters by statistically significant difference on the Z-axis