• 한국전자파학회논문지
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• 제28권4호
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• pp.336-346
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• 2017

Sigma, Delta 및 Guard 수신 채널을 가진 항공기 레이다의 공대지 GMTI(Ground Moving Target Indication) 모드를 위한 Sigma-Delta STAP(Space Time Adaptive Processing) 적용 방법, GMTI 처리 방법을 제시하였다. 제시한 방법들을 ICM(Internal Clutter Motion) 환경을 고려한 클러터 모의 환경 및 신호처리 시뮬레이션, MDV(Minimum Detectable Velocity)를 통해 성능을 분석하여 그 결과들을 보였다. 제시한 Sigma-Delta STAP 처리 방법 및 GMTI 처리 방법들은 특정 항공기 레이다 시스템에 의한 제약 사항에 덜 영향 받으면서 실제 적용이 용이하다.

• 한국운동역학회지
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• 제29권3호
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• pp.129-135
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• 2019

Objective: The purpose of this study is to present the scientific and quantitative data by finding the common points and differences of the side-kick according to the height change through the difference of the side kick motion performance according to the three target height changes and the function of the lower limbs muscle in side kick motion of Taekwondo Poomsae. Method: For this, total 14 players were selected who were registered in Korea Taekwondo Association and skilled group 7 players who had a medal from national competition and 7 players who did not have Taekwondo experience from department of physics. 4 video cameras to the feature on side kick per target height, and the subjects' support foot was located on the ground reactor and the practice was conducted 3 times: waist, chest, and head as the target height. the basic materials were collected by using Kwon 3D XP program and the T-test was conducted to verify the statistic difference between groups (SPSS 24.0). At this time, the statistics significance level was set as .05 and the following conclusion was obtained. Results: The lower the proficiency and the higher the height, the more the joint coordination between the hip and the knee. Conclusion: Summary of the result shows a common point that the change of target's height makes the lower the proficiency and the higher the height, the more the joint coordination between the hip and the knee. Also, the higher the target's height became, the greater angular momentum of thighs, shanks, foot became in common.

• 한국멀티미디어학회논문지
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• 제10권6호
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• pp.716-725
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• 2007

In this paper we describe a motion tracking algorithm for 3D human animation using stereo vision system. This allows us to extract the motion data of the end effectors of human body by following the movement through segmentation process in HIS or RGB color model, and then blob analysis is used to detect robust shape. When two hands or two foots are crossed at any position and become disjointed, an adaptive algorithm is presented to recognize whether it is left or right one. And the real motion is the 3-D coordinate motion. A mono image data is a data of 2D coordinate. This data doesn't acquire distance from a camera. By stereo vision like human vision, we can acquire a data of 3D motion such as left, right motion from bottom and distance of objects from camera. This requests a depth value including x axis and y axis coordinate in mono image for transforming 3D coordinate. This depth value(z axis) is calculated by disparity of stereo vision by using only end-effectors of images. The position of the inner joints is calculated and 3D character can be visualized using inverse kinematics.

• 한국운동역학회지
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• 제25권1호
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• pp.123-130
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• 2015

Purpose : The purpose of this study was to investigate the reliability of 3D-inertia measurement unit (IMU) based shoes in gait analysis. This was done with respect to the results of the optical motion capturing system and to collect reference gait data of healthy subjects with this device. Methods : The Smart Balance$^{(R)}$ system of 3D-IMU based shoes and Osprey$^{(R)}$ motion capturing cameras were used to collect motion data simultaneously. Forty four healthy subjects consisting of individuals in 20s (N=20), 40s (N=13), and 60s (N=11) participated in this study voluntarily. They performed natural walking on a treadmill for one minute at 4 different target speeds (3, 4, 5, 6 km/h), respectively. Results : Cadence (ICC=.998), step length (ICC=.970), stance phase (ICC=.845), and double-support phase (ICC=.684) from 3D-IMU based shoes were in agreement with results of optical motion system. Gait data of healthy subjects according to different treadmill speeds and ages were matched to previous literature showing increased cadence and reduced step length for elderly subjects. Conclusion : Conclusively, 3D-IMU based shoes in gait analysis were a satisfactory alternative option in measuring linear gait parameters.

• 한국정보과학회논문지:시스템및이론
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• 제35권8호
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• pp.407-415
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• 2008

본 연구에서는 긴 춤 시퀀스를 춤 세그먼트들로 분절하는 방법과 이 춤 세그먼트들의 자연스러운 연결을 위한 전이 방법을 제안한다. 제안하는 분절화(segmentation) 방법은 라반 운동 분석(LMA)을 기반으로 한다. 춤 세그먼트 안에서 춤추는 캐릭터 외형의 변화가 일정한 패턴을 이루며 발생하는 것에 착안하여, 패턴이 변화되는 구간에서 춤 세그먼트의 경계를 찾는다. 이 방법은 춤 시퀀스에서 얻어낸 LMA의 외형 곡선에서 키 자세(key pose)를 찾고, 나타나는 패턴을 분석하여 수행된다. 제안하는 전이(transition) 방법은 춤과 같이 유사도가 낮은 모션을 대상으로 하고 있다. 이 방법은 선형 보간 방법을 기본으로 이용하고, 발에 발생하는 제약사항을 만족하도록 중간 자세를 생성하고, 전이 구간 중간의 키 프레임으로 사용하여 전이를 완성한다. 우리가 제안하는 방법들은 기존의 춤 모션 데이타를 사용한 새로운 춤 시퀀스 합성에 활용이 가능하다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.673-676
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• 2003

This paper deals with the problem of moving object detection and location in computer vision. We describe a new object-dependent motion analysis method for tracking target in an image sequence taken from a moving platform. We tackle these tasks with three steps. First, we make an active contour model of a target in order to build some of low-energy points, which are called kernels. Then we detect interest points in two windows called tracking windows around a kernel respectively. At the third step, we decide the correspondence of those detected interest points between tracking windows by the probabilistic relaxation method In this algorithm, the detecting process is iterative and begins with the detection of all potential correspondence pair in consecutive image. Each pair of corresponding points is then iteratively recomputed to get a globally optimum set of pairwise correspondences.

• 한국군사과학기술학회지
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• 제11권6호
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• pp.5-13
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• 2008

A smart submunition drops through the expected trajectory to have a appropriate target searching footprint for the armored ground vehicles. Parachutes can be used as a tool to decelerate and spin the submunition. Usually submunition's descent velocity, spin rate, submunition inclination angle against vertical and dynamic stability affect to its target searching footprint. Therefore it is important to design optimal parachute and load configuration for the overall system performance. In this paper we described the dynamic motion of submunition by the mathematical model of parachute and load. Through the computer simulation we can analyze the submunition footprint affected by parachute and load design.

• 한국의학물리학회지:의학물리
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• 제24권3호
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• pp.198-203
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• 2013

일반적으로 호흡연동방사선치료(gated radiation therapy)의 평가를 위해 호흡에 의한 장기의 움직임을 모사하는 움직이는 팬텀(moving phantom)을 사용한다. 표적(target)은 모든 방향으로 움직이기 때문에 모든 방향의 움직임을 고려하여야 한다. 본 연구에서는 감마지표(gamma index) 분석을 통한 호흡연동방사선치료의 평가방법을 제시하고 움직임영역(motion range)에 따른 적절한 연동창(gating window)의 크기를 알아보고자 한다. 두미축(craniocaudal) 방향으로 움직임을 모사하는 팬텀을 제작하였다. 이 팬텀은 움직이는 받침대(moving platform), 2차원 이온전리함배열(I'm MatriXX, IBA Dosimetry, Germany), 및 고체물팬텀(solid water phantom)으로 이루어졌다. 6 MV 에너지의 광자선을 $4{\times}4cm^2$의 조사면(field size)으로 호흡연동방사선치료 시스템을 이용하여 팬텀을 각각 1, 2, 3, 4, 및 5 cm 만큼 움직이도록 하고 방사선을 조사하였다. 연동창은 각각 40~60%, 30~70%, 및 0~90%으로 설정하였다. 2차원 이온전리함배열은 각 시나리오에 따라 선량분포를 획득하였고 $4{\times}4cm^2$ 조사면으로 정지한 상태에서 조사한 선량분포와 비교하였다. 허용범위를 3%/3 mm로 설정하고 감마지표를 계산하였다. 연동창(gating window)의 크기가 클수록 합격률(pass rate)는 낮아졌고, 운동영역(motion range)이 커질수록 합격률은 낮아졌다. 호흡연동방사선치료를 시행하지 않고 운동영역이 2 cm의 병소를 치료할 경우 합격률은 96% 이하로 현저히 떨어졌다. 그러나 호흡연동방사선치료를 시행하면 합격률은 99% 이상으로 올릴 수 있었다. 운동영역이 4 cm 이상일 경우 호흡연동방사선치료를 하더라도 연동창을 30~70%로 선택할 경우 합격률이 97%를 넘지 못하였다. 그러나 연동창을 40~60%를 선택할 경우 합격률은 99% 이상이었다.

• 한국전문물리치료학회지
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• 제17권1호
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• pp.36-42
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• 2010

The aim of this study was to investigate effects of reaching distance on movement time and trunk kinematics in hemiplegic patients. Eight hemiplegic patients participated in this study. The independent variables were side (sound side vs. affected side) and target distance (70%, 90%, 110%, and 130% of upper limb). The dependent variables were movement time measured by pressure switch and trunk kinematics measured by motion analysis device. Two-way analysis of variance with repeated measures was used with Bonferroni post-hoc test. (1) There were significant main effects in side and reaching distance for movement time (p=.01, p=.02). Post-hoc test revealed that there was a significant difference between 110% and 130% of reaching distance (p=.01). (2) There was a significant main effect in side and reaching distance for trunk flexion (p=.01, p=.00). Post-hoc test revealed that there were significant differences in all pair-wise reaching distance comparison. (3) There was a significant side by target distance interaction for trunk rotation (p=.04). There was a significant main effect in target distance (p=.00). Post-hoc test revealed that there were significant differences between 70% and 110%, 70% and 130%, 90% and 110%, 90% and 130% of target distance. It was known that trunk flexion is used more than trunk rotation during reaching task in hemiplegic patients from the findings of this study. It is also recommended that reaching training is performed with limiting trunk movement within 90% of target distance whereas reaching training is performed incorporating with trunk movement beyond 90% of target distance in patients with hemiplegia.

• 한국군사과학기술학회지
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• 제12권5호
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• pp.590-600
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• 2009

In the simulation of underwater vehicles such as a submarine or a torpedo, various type of simulations like an engineering level simulation for predicting the performance precisely and an engagement level simulation for examining the effectiveness of a certain tactic is required. For this reason, a tactics manager which can change the behavior of a simulation model according to external tactics is needed. In this study the tactics manager supporting a script language and engine which can represent various tactics and can help users define external input tactics for the tactic manager easily is suggested. Python and Lua which are representative among script languages have been compared and analyzed from the viewpoint of a tactic manage, and the tactic manger using the script engines of those script languages was implemented. To demonstrate the effectiveness of the tactic manager, a target motion analysis simulation of the warfare between a submarine and a surface ship.