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디지탈 혈관 조영상에서의 좌심실 경계 자동검출을 이용한 심박출 계수의 측정
구본호,이태수 대한의용생체공학회 1987 의공학회지 Vol.8 No.2
Detection of left ventricular boundary for the functional analysis of LV(left ventricle) is obtained using automatic boundary detection algorithm based on dynamic program ming method. This scheme reduces the edge searching time and ensures connective edge detection, since it does not require general edge operator, edge thresholding and linking process of other edge detection methods. The left ventricular diastolic volume and systolic volume were computed after this automatic boundary detection, and these volume data were applied to analyze LV ejection fraction.
태권도 몸통돌려차기 시 무릎관절에 작용하는 전단력에 대한 분석
구본호 한국무예학회 2017 무예연구 Vol.11 No.3
The purpose of this study was to analyze knee joint shear force to predict the possibility of overuse injury on the ligaments which function to maintain the stability of the knee joint during Taekwondo roundhouse kicking. Sixteen Taekwondo sparring athletes who primarily use right leg for roundhouse kick were randomly selected and divided into two groups by sex(8 males and 8 females). The Mann-Whitney U test was performed to verify the difference between the two groups according to sex. Significance level (α) of all the statistical analyzes were set to .05. The results obtained in this study are as follows. 1. The maximum value of the forward shear force on the knee joint of kicking leg was larger (p=.007) in male group (.186±.029) than female group (.142±.027). Maximum value of backward was larger (p=.015) in male group (-.437±.088) than female group (-.334±.089). Also, the range of value was larger (p=.007) in male group (.623±.095) than female group (.476±.087). 2. The range of value of shear force on the knee joint of supporting leg was larger (p=.021) in male group (.517±.047) than female group (.461±.045). 3. The maximum value of the medial side shear force on the knee joint was larger (p=.006) in kicking leg (-.130±.051) than supporting leg (-.079±.041), and the range of value was larger (p=.008) in kicking leg (.277±.099) than supporting leg (.198±.061). 4. The maximum value of the forward shear force on the knee joint was larger (p<.001) in supporting leg (.272±.058) than kicking leg (.164±.035), and the percent time of maximum value of forward was faster (p<.001) in kicking leg (45.1±5.5) than supporting leg (66.1±4.9). Maximum value of backward was larger (p=.001) in kicking leg (-.385±.100) than supporting leg (-.217±.050), and the percent time of maximum value of backward was faster (p<.001) in kicking leg (40.9±11.7) than supporting leg (91.4±14.7). 본 연구의 목적은 태권도 겨루기선수들이 몸통돌려차기를 수행할 때 무릎관절의 안정성을 유지하기 위해 기능하는 십자인대 및 측부인대에 작용하는 전단력을 역동역학적 기법으로 분석하는 것이다. 연구대상자들은 오른발을 주 사용발로 하는 남, 녀 겨루기선수 각 8명, 총 16명이며, 성별에 따라 두 집단으로 구성하여 연구를 진행한 결과는 다음과 같다. 1. 차는 다리의 무릎관절에 작용하는 전후방향의 전단력에 대하여 전방최대값은 남자집단(.186±.029)이 여자집단(.142±.027)보다 크게 나타났으며(p=.007), 후방최대값은 남자집단(-.437±.088)이 여자집단(-.334±.089)보다 크게 나타났다(p=.015). 또한 값의 범위는 남자집단(.623±.095)이 여자집단(.476±.087)보다 크게 나타났다(p=.007). 2. 버팀다리의 무릎관절에 작용하는 전후방향의 전단력에 대하여 값의 범위에서 남자집단(.517±.047)이 여자집단(.461±.045)보다 크게 나타났다(p=.021). 3. 차는 다리와 버팀다리의 무릎관절에 좌우방향으로 작용하는 전단력에 대하여 좌측최대값은 차는 다리(-.130±.051)가 버팀다리(-.079±.041)보다 크게 나타났으며(p=.006), 값의 범위는 차는 다리(.277±.099)가 버팀다리(.198±.061)보다 크게 나타났다(p=.008).
李光一,任成雲,馬鎭碩,具本鎬 慶一大學校 1998 論文集 Vol.15 No.1
In this paper, we propose new velocity sensing method for dynamically tuned gyroscope (DTG) which is widely used as a sensor in various inertial navigation systems. In case of external angular velocity input, the proposed scheme can make a smaller tilt-angle rather than that of conventional PI control. Therefore, the proposed scheme achieves the wider dynamic range of DTG. The proposed scheme is verified by theoretical analysis and computer simulations.