• 한국운동역학회지
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• 제17권3호
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• pp.197-207
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• 2007

It has been reported that Back-Tension played a significant role in archery (Lee & Bondit, 2005; Kim, 2007) but there are a few researches related Back-Tension in Korea recently. Therefore, the purpose of this study was to investigate archery back tension technique for the second ranked archer in the World and to find ways to improve performance. A subject(height: 185cm, mass: 82kg, years: 21yrs, careers: 12yrs) who is a number of national team and the second ranked archer in the World authorized by FITA (Federation Internationale de Trial Arc) was perticipated in this experiment. When shooting 60 shots($12{\times}5$), shooting motions were recorded with 7 infrared cameras and 2 ultrahigh-speed cameras. A QTM and an Auto Track were used to acquire raw data. The sampling rates of both cameras were 200 Hz. and 1000 Hz. respectively and data were filtered using a fourth order Butterworth low pass filtering with a cutoff-frequency of 30Hz. The parameters were calculated with Matlab6.5 and analyzed with SPSS11.0. After Pearson's correlations between 8 parameters were analyzed, 5 parameters from 13parameters that affected records were analyzed with multiple regression analysis (Enter order: x1, x2, x3, x4, x5). The results were as follows: 1. Comparing between parameters according to scores, the patterns of horizontal and vertical angular velocity(av.) of scapular relative angle was different between 8 score and 9 or 10 scores. 2. The correlations of parameters that affected records were a horizontal av.(x1, p=.032<.05) and a vertical av.(x3, p=.033<.05) of scapular from release to delivery in KB back-tension (anchoring-delivery). 3. The decision coefficients(R2) of above two parameters and three parameters selected by experts that may affect record, that is, an absolute trunk angle(x4) from in KKC back-tension (anchoring-release) and a horizontal relative scapular angle(x2) and an absolute trunk angle(x5) from release to delivery in KB back-tension were 7.7%(x1), 0.1%(x2), 8.5%(x3), 0.7%(x4) and 0.9%(x5) in sequence. 4. The multiple regression equation was a y= -1.16E-2 x1 + 0.109 x2 + 3.437E-2 x3 + 6.139E-2 x4 + 0.117 x5 + 3.420 In conclusion, a total contribution was low, that is, R2(17.9%) suggested that on the one hand, Lim's motion may not depend on a certain factor because his postural factors affected shooting motion are some stable on the other hand, unknown factors may exist(e.g. psychological, physiological factors etc.). Further study of EMG patterns of muscles and anatomic consideration related to shoulder girdle and scapular bones may help to identify mechanism of Back-Tension.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.537-540
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• 2005

The attitude control, sensors and camera installed on the spacecraft should be located according to the system alignment requirement. The alignment measurement requirement accuracy for the sensors should be below $\pm$0.1. Therefore, Alignment Measurement System which is combined theodolite, Rotating table and digital inclinometer etc., should be used. As the measurement accuracy is required very precise, the appropriate measurement procedure and alignment angle measurement, calculation and shimming work should is accomplished. Consequently, this paper is accomplished the works to align the measurement requirement accuracy throughout alignment measurement and shimming work of installed module and sensor

• 한국공작기계학회논문집
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• 제12권6호
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• pp.64-70
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• 2003

A measurement of spacecraft alignment is an important process of spacecraft assembly, integration and test because it is necessary that a ground station controls the precise positions of on-orbit spacecraft by using the alignment data of attitude orbit control sensors(AOCS) on spacecraft. In addition, accuracy of spacecraft alignment requirement is about $0.1^{\circ}$~$0.7^{\circ}$. The spacecraft alignment is measured by autocollimation of theodolite. This paper describes the measurement principle and method of spacecraft alignment. The result shows that all of the AOCS on the spacecraft are aligned within the tolerance required through the alignment measurement.

• 한국항공우주학회지
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• 제31권10호
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• pp.105-111
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• 2003

위성체 정렬은 위성체 조립 및 시험과정에서 중요한 부분이다. 인공위성이 우주궤도상에서 성공적인 임무를 수행하기 위해서는 자세제어 및 탑재체용 부분품들에 대하여 측정허용오차 $0.1^{\circ}{\sim}0.7^{\circ}$의 정밀하고 정확한 측정이 요구되며 정렬된 상태에서의 위성체 좌표계의 정확한 방향좌표를 측정하여 지상에 위치한 위성체 관제부에서 위성체의 자세제어 등에 사용하도록 제공하게 된다. 본 논문에서는 자동시준에 의한 위성체 정렬 측정 이론에 대하여 기술하고 데오도라이트를 사용하여 위성체 정렬을 측정할 수 있는 측정방법 및 그 측정 결과에 대하여 고찰해 보고자 한다.

• 한국항공우주학회지
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• 제32권7호
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• pp.98-104
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• 2004

위성체 얼라인먼트 측정은 측정 정밀도가 ${\pm}0.5^{\circ}$ 이하로 매우 정밀한 것이다. 일반적으로 이러한 측정은 3대 이상의 데오드라이트를 사용하여 측정되고 있다. 그러나 위성체의 위치 안정성 등에 의해 측정 정밀도 오차가 발생될 수 있다. 이에 따라, 데오드라이트, 회전 테이블 및 전자식 수평계 등을 조합하여 새로운 얼라인먼트 측정 시스템을 개발하게 되었다. 본 논문에서 이러한 측정 시스템의 개념과 측정 방법을 기술하였고, 기존의 측정 방법보다 더 좋은 정밀도를 얻을 수 있음을 알 수 있다.