• 한국군사과학기술학회지
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• 제24권6호
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• pp.577-590
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• 2021

In this paper, we theoretically analyzed the self-alignment/navigation performance in the accelerometer resonance state generated by dither motion of ring laser gyroscope in LINS and verified it through simulation. As a result of analysis, it is confirmed that the amplitude of the accelerometer measurement amplified in the accelerometer resonance state is decreased in the process of sampling per the navigation calculation period and that frequency is changed by the aliasing effect too. It was also analysed that the attitude error in self-alignment is determined by the amplitude/frequency of the accelerometer measurement, the gain of the self-alignment loop, and the velocity and position error in the navigation is determined by the amplitude/frequency/phase error of the accelerometer measurement. This analysis and simulation results show that the self-alignment and navigation performance is not be degraded only when the amplification factor of the accelerometer measurement in the accelerometer resonance state is 3 or less

• 한국의류산업학회지
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• 제17권4호
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• pp.635-645
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• 2015

This study analyzed the range of motion of upper body in different configurations of firefighters' protective clothing and equipment. The purpose of this study was to understand the influence of firefighters' protective clothing and equipment over upper body motion in order to improve design of firefighters' protective clothing and equipment. 12 firefighters' upper body range of motion was analyzed while performing standing and walking trials in five different garment configurations including turnout ensemble, fire boots and the self-contained breathing apparatus. Analysis of upper body range of motion included spinal joints of L5S1, L4L3, T1C7, and C1Head. During standing trials, garment configurations caused a significant difference in range of motions at joints of L5S1, L4L3, T1C7, and C1Head. Analysis on the mean of range of motions at L5S1 and L4L3, showed that firefighters' waist bent forward significantly to a greater extent while they wore a self-contained breathing apparatus. A significantly increased range of motion was found for T1C7 and C1Head while carrying a self-contained breathing apparatus, which indicated an increase in the extension of the trunk and neck backward to stand upright and look squarely. A significant difference in range of motion was also found for L5S1 and L4L3 during walking trials.

• 지역사회간호학회지
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• 제22권2호
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• pp.151-161
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• 2011

Purpose: The purpose of this study was to analyze the effects of a case management program on range of motion, pain, depression and self efficacy in community-dwelling older women with knee arthritis. Methods: The research design was one-group pre and post-test design with 40 participants with knee arthritis who agreed to participate in the 12-week case management program. Data were collected four times, before and after 4, 8 and 12 weeks. Results: Repeated measures ANOVA revealed significant differences between before and after the service in range of motion, pain, depression and self efficacy. Significant improvements from the baseline to 4 weeks after the service were observed in the measurements of range of motion, pain, depression and self efficacy. There were no significant differences in range of motion, pain and depression between 4 and 12 weeks after the services. Conclusion: This study represents the first effort showing that a case management program can have positive outcomes on range of motion, pain, depression and self efficacy for older women with knee arthritis. More research using a control group pre-post test design considering time lapse is needed in order to examine more accurately the effects of case management programs for knee arthritis.

• 대한물리의학회지
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• 제18권1호
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• pp.37-50
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• 2023

PURPOSE: This study examined the effects of various interventions for improving the hip joint range of motion on elite badminton players, including body balance ability, jumping power, smash speed, and joint range of motion. METHODS: The study was conducted on elite badminton players belonging to the S badminton team in Yongin, Gyeonggi-do, and the M badminton team in Suwon, Gyeonggi-do. Twenty-one elite badminton players were selected; they were assigned randomly to Experimental Group 1 (n = 11) and Experimental Group 2 (n = 10). Before and after the intervention, the hip joint range of motion, modified star excursion balance test, Sargent jump, and smash speed were measured. In Experimental Group 1, hip joint manual mobilization was applied by a physical therapist, and hip self-exercise performed by the athletes was applied in Experimental Group 2. This intervention was applied once a day, three times a week, for four weeks. RESULTS: A significant increase in the hip joint range of motion (flexion and extension) and modified star excursion balance test (posteromedial direction) was observed in Experimental Group 1 (hip joint mobilization applied group) compared to Experimental Group 2 (hip joint self-exercise applied group) (p < .05). CONCLUSION: When elite level badminton players require improvement in hip flexion and extension range of motion and posteromedial body balance, hip joint mobilization is more effective than hip self-exercise application.

• 한국통신학회논문지
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• 제24권9A호
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• pp.1411-1418
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• 1999

본 논문에서는, 움직임 예측과 신경 회로망을 이용한 고속 움직임 추려하여, 현재 블록의 움직임 벡터를 인적 블록들의 움직임 벡터들로 예측하정 알고리즘을 제안하였다. 움직임 벡터의 공간적 상관성이 높다는 점을 고였다. 학습 시간이 빠르고 2차원 적응적 특성의 KSFM(Kohonen self-organizing feature map) 신경망을 이용하여, 움직임 벡터의 코드북(codebook)을 설계하였다. 2차원 코드북상에서 서로 비슷한 코드벡터들(codevectors)은 가까이 위치하므로, 예측 코드벡터로부터 코드북상에서 점진적으로 움직임을 추정하였다. 모의 실험 결과, 제안한 방법이 적은 계산량으로도 우수한 성능을 나타냄을 확인하였다.

• 대한물리의학회지
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• 제14권4호
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• pp.81-91
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• 2019

PURPOSE: This study examined the effects of Kinesiology taping followed by pectoralis minor muscle self-stretching on the rounded shoulder posture, neck range of motion, and upper trapezius muscle tone in subjects with a rounded shoulder posture. METHODS: Thirty adults with a rounded shoulder posture were assigned randomly to one of two groups, either one that only performed pectoralis minor muscle self-stretching or a group that performed pectoralis minor muscle self-stretching after applying Kinesiology taping ; the subjects underwent four weeks of intervention. Three rounds of intervention were carried out over four weeks, and before and after the experiment, rounded shoulder posture, neck range of motion, and upper trapezius muscle tone creep were measured. RESULTS: Following the interventions, both the experimental and control groups showed significant improvement in the rounded shoulder posture, neck range of motion, upper trapezius muscle tone, stiffness, relaxation, and creep. Significant differences in the post training gains in the rounded shoulder posture and neck range of motion were observed between the experimental and control groups. CONCLUSION: These results showed that a combination of Kinesiology taping and pectoralis minor muscle self-s tretching led to more significant improvement than that seen when only utilizing the application of pectoralis minor muscle self-stretching to change the posture of the subjects with a rounded shoulder posture.

• 대한조선학회지
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• 제20권4호
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• pp.25-32
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• 1983

A series of model testes on a container ship in regular were executed. This paper presents the results of resistance, self-propulsion, and ship motion tests. The experimental results of ship motion measured on a towed model and a self-propelled model were compared with those of Japanese's model test showing fairly good agreements. The results of added resistance tests were compared with those of Japanese' model test and also compared with the calculation results by Gerritsma's method showing somewhat large discrepancies at higher speeds. Also the results of added resistance tests measured on a fixed model were compared with the calculation results by Gerritsma's method. Finally the results of self-propulsion tests were presented.

• 한국기계연구소 소보
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• 통권10호
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• pp.49-62
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• 1983

A series of model tests on a container ship in waves was executed at the Experimental Towing Tank of Ship Research Station, KIMM. This paper presents the results of resistance, self-propulsion, propeller open-water and ship motion tests in regular head waves. Firstly, the experimental results of ship motion measured on a towed model and a self-propelled model were compared with those of Japanese results showing fairly good agreements. Secondly, the results of resistance and propulsion tests were analyzed and the data of added resistance, thrust increase, torque increase, revolution increase and self-propulsion factors in waves were presented. Also the diffraction force measured on a fixed model in waves was analyzed. Finally, this report shows the propeller characteristics in calm water based on propeller immersion and in regular waves based on wave length.

• 한국정보통신학회논문지
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• 제7권5호
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• pp.1002-1012
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• 2003

본 논문에서는 여유 자유도를 이용한 두 팔 로봇 매니퓰레이터의 충돌 회피 알고리즘을 제안한다. 여유 자유도를 갖는 각 로봇 팔의 엔드-이펙터는 서로의 충돌을 회피하면서 주어진 작업을 수행하기 위하여 각각 미리 정의된 직선 경로를 따라 이동해야 한다. 이 문제를 풀기 위해서 엔드-이펙터의 위치와 방향을 변화시키지 않는 각 축의 동작인 자체동작을 이용한다. 매 샘플링 시간마다 각 팔의 링크들이 서로 멀어지는 방향으로 자체 동작을 수행함으로써 엔드-이펙터가 주어진 작업도 성공적으로 수행하고, 동시에 서로의 충돌도 회피할 수 있다. 제안한 알고리즘의 성능을 분석하기 위하여 각각 9자유도의 팔을 갖는 두 팔 로봇 매니퓰레이터에 대한 모의실험을 수행하고 그 결과를 제시한다.

• International Journal of Control, Automation, and Systems
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• 제4권6호
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• pp.725-735
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• 2006

This paper deals with the problem of self-learning cooperative motion control for the pushing task of a humanoid robot in the sagittal plane. A model with 27 linked rigid bodies is developed to simulate the system dynamics. A simple genetic algorithm(SGA) is used to find the cooperative motion, which is to minimize the total energy consumption for the entire humanoid robot body. And the multi-layer neural network based on backpropagation(BP) is also constructed and applied to generalize parameters, which are obtained from the optimization procedure by SGA, in order to control the system.