• Korean Journal of Applied Biomechanics
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• v.12 no.2
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• pp.179-195
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• 2002

The purpose of this research is to provide a proper model by analyzing the sports biomechanical of physical movements on the basis of the two patterns(open-stance and cross-stance) at the ready-to-start pose. The subjects for this study are composed of five male handball players from P university and five female shooting players from S university. Three-way moving actions at start(right, left, and forward) are recorded with two high-speed video cameras and measured with two Force platforms and a EMG system. Three-dimensional action analyzer, GRF system, and Whole body reaction movement system are used to figure out the moving mechanisms at the start pose. The analytic results of the moving mechanism at the start pose were as follows. 1. Through examining the three-way moving actions at start, I have found the cross-stance pose is better for the moving speed of body weight balance than the open-stance one. 175 degree of knee joint angle at "take-off" and 172 degree of hip joint angle were best for the start pose. 2. The Support time and GRF data shows that the quickest center of gravity shift was occurred when cross-stanced male subjects started to move toward his lefthand side. The quickest male's average supporting time of left and right foot is 0.19${\pm}$0.07 sec., 0.26${\pm}$0.06sec. respectively. The supporting time difference between two feet is 0.07sec. 3. Through analyzing GRF of moving actions at start pose, I have concluded that more than 1550N are overloaded on one foot at the open-stance start, and the overloaded force may cause physical injury. However, at the cross-stance pose, The GRF are properly dispersed on both feet, and maximum 1350N are loaded on one foot.

• Radiation Oncology Journal
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• v.29 no.2
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• pp.91-98
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• 2011

Purpose: To assess the usefulness of implanted fiducial markers in the setup of hypofractionated radiotherapy for prostate cancer patients by comparing a fiducial marker matched setup with a pelvic bone match. Materials and Methods: Four prostate cancer patients treated with definitive hypofractionated radiotherapy between September 2009 and August 2010 were enrolled in this study. Three gold fiducial markers were implanted into the prostate and through the rectum under ultrasound guidance around a week before radiotherapy. Glycerin enemas were given prior to each radiotherapy planning CT and every radiotherapy session. Hypofractionated radiotherapy was planned for a total dose of 59.5 Gy in daily 3.5 Gy with using the Novalis system. Orthogonal kV X-rays were taken before radiotherapy. Treatment positions were adjusted according to the results from the fusion of the fiducial markers on digitally reconstructed radiographs of a radiotherapy plan with those on orthogonal kV X-rays. When the difference in the coordinates from the fiducial marker fusion was less than 1 mm, the patient position was approved for radiotherapy. A virtual bone matching was carried out at the fiducial marker matched position, and then a setup difference between the fiducial marker matching and bone matching was evaluated. Results: Three patients received a planned 17-fractionated radiotherapy and the rest underwent 16 fractionations. The setup error of the fiducial marker matching was $0.94{\pm}0.62$ mm (range, 0.09 to 3.01 mm; median, 0.81 mm), and the means of the lateral, craniocaudal, and anteroposterior errors were $0.39{\pm}0.34$ mm, $0.46{\pm}0.34$ mm, and $0.57{\pm}0.59$ mm, respectively. The setup error of the pelvic bony matching was $3.15{\pm}2.03$ mm (range, 0.25 to 8.23 mm; median, 2.95 mm), and the error of craniocaudal direction ($2.29{\pm}1.95$ mm) was significantly larger than those of anteroposterior ($1.73{\pm}1.31$ mm) and lateral directions ($0.45{\pm}0.37$ mm), respectively (p<0.05). Incidences of over 3 mm and 5 mm in setup difference among the fractionations were 1.5% and 0% in the fiducial marker matching, respectively, and 49.3% and 17.9% in the pelvic bone matching, respectively. Conclusion: The more precise setup of hypofractionated radiotherapy for prostate cancer patients is feasible with the implanted fiducial marker matching compared with the pelvic bony matching. Therefore, a less marginal expansion of planning target volume produces less radiation exposure to adjacent normal tissues, which could ultimately make hypofractionated radiotherapy safer.

• 전기산업
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• v.14 no.9
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• pp.25-37
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• 2003

• Korean Journal of Applied Biomechanics
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• v.12 no.2
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• pp.131-142
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• 2002

The purpose of this study was to analyze kinematic variables of a Mae-ukemi (forward breakfall :MU) in Judo through 3-D image analysis with five Judoka with over 2 years' career (2nd dan, 3rd dan). The kinematic variables include posture, and distance variables; the mean values and the standard deviations for each variable were obtained to analyze kinematic variables of a MU in Judo. From the data analysis and discussion, the following conclusions were drawn : 1) Posture variables : The angles of wrists during right before Mae-ukemi (RBU) were extended from the just MU position(MUP) and flexed from in the right after MU(RAU), and there was a difference in the displacement between the angles of the right and left wrists. The angles of elbows were flexed in the ready position from in the RAU. The angles of ankles were flexed from the ready position to that down position, extended from the down position to that transition, and flexed from the transition positiont to that RAU. 2) Distance variables : The distance height between the mat and shoulders in the RBU(32.2cm) to in the MUP(18.3cm) and in the RAU(20.5cm). during that height between the mat and hips in the RBU(48.0cm) to in the MUP(23.4cm), and in the RAU(30.6cm).

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.07a
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• pp.449-455
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• 2003

일어서는 동작은 일상생활에서 하는 가장 일반적인 행동 중의 하나이며, 다른 동작으로의 전환을 위한 준비자세이기도 하다(Riley PO 등 1991). Corrigan D 등(2001)에 따르면 1987년 65세 이상의 공공시설(병원, 재활시설 등)에서 기거하지 않는 약 2백만 명의 노인이 일어서는 동작에서 어려움을 느낀다고 한다. 또한 무릎의 신근(신전을 담당하는 근육)이 약화된 환자들에게도 앉은 자세에서 일어서는 동작은 무릎에 가장 무리를 주는 동작 중의 하나로 작용한다. (중략)

• Korean Architects
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• no.3 s.359
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• pp.10-13
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• 1999

• Journal of Digital Convergence
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• v.18 no.12
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• pp.97-103
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• 2020

The proposed system is composed of two parts, an AI physical fitness measurement part and an AI physical fitness management part. In the AI fitness measurement part, a guide to physical fitness measurement and accurate calculation of the measured value are performed through deep learning-based pose recognition. Based on these measurements, the AI fitness management part designs personalized exercise programs and provides them to dedicated smart applications. To guide the measurement posture, the posture of the subject to be measured is photographed through a webcam and the skeleton line is extracted. Next, the skeletal line of the learned preparation posture is compared with the extracted skeletal line to determine whether or not it is normal, and voice guidance is provided to maintain the normal posture.

• Digital Contents
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• no.4 s.47
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• pp.46-49
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• 1997

이번호부터는 홈페이지에 보다 다양한 기능을 가능하게 해주는 자바스크립트에 대해 자세한 내용을 다루도록 한다. 지금부터 준비하는 자바스크립트에 대한 강좌는 프로그램에 대해 특별한 경험이 없는 독자들을 대상으로 프로그램에 대한 기본적인 마인드와 자바스크립트의 핵심적인 구조 및 활용까지를 다루어 볼 것이다.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.657-660
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• 2000

전력연구원은 원자로 내부에 적용하기 위한 소형경량의 수중로봇을 개발하기 위한 준비작업으로 자이로를 이용한 수중로봇 조향장치를 개발하고 있다 이장치는 자이로 3개를 조합한 모듈을 서보가 회전시켜 일정한 방향으로 서보의 회전속도에 비례하는 회전토크를 발생하도록 고안되었다 발생된 토크는 작용/반작용의 원리에 의해 서보가 부착되어있는 로봇본체에 작용한다. 이장치를 이용하면 수중로봇의 중심에서 Yaw와 Pitch를 제어할 수 있는 토크가 발생하고 좁은 공간에서 신속한 자세변환이 가능하다 본 고에서는 자이로 조향장치의 구조와 이론적 배경 및 시뮬레이션 결과를 소개한다.

• KLA journal
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• v.46 no.1 s.356
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• pp.23-32
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• 2005

2005년도 벌써 1달이 지나갔다. 지난 연말 각 도서관별로 한해를 정산하느라 몹시 분주해서였을까. 아직은 전체적으로 조용한 느낌이다. 2005년을 예측하는 글 중에는 '주5일근무제', '학교도서관', '법개정' 등의 단어가 많이 눈에 들어온다. <공공도서관 자료구입비 지원예산 지방 이양>, <도서관정책 담당부서 이관> 등의 굵직한 정책 변화도 과연 우리의 현실에 어떤 모습으로 다가올지 궁금하다. 미래를 선점하기 위해서는 올바르게 예측하고 끊임없이 준비하는 자세가 필요하다. 부디 우리가 계획하고 준비한대로 도서관계가 2005년을 걸어갈 수 있기를 소망한다.