• 대한통합의학회지
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• 제4권4호
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• pp.21-32
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• 2016

Purpose: The purpose of this study was to identify whether task-related circuit exercise program combined with sensorimotor training for 4 weeks could improve the balance and gait in stroke patients. Method: Fifteen stroke patients who had agreed with the study were randomly divided into 3 groups categorized as task-related circuit exercise program combined with sensorimotor training group (experimental group 1, n=5), task-related circuit exercise program group (experimental group 2, n=5), and control subjects performed conventional physical therapy (control group, n=5). The balance and gait were assessed by BT-4 force platform system, Berg Balance Scale, 10meter Walk Test and Smart Step at before training and after training. Wilcoxon signed rank test was used to analyze change before and after intervention in intra-group. Kruskal Wallis H test, Mann-Whitney U test and Bonfferoni correction were used to analyze changes of all variables in inter-groups. Result: The experimental group 1 showed significant improvements in postural sway area, BBS scores, walking velocity and plantar pressures of affected foot, whereas the experimental group 2 showed significant improvements in BBS scores, and the control group were no significantly different in all variables following training. The changes of postural sway area and BBS scores in the experimental group 1 were significantly greater than them of the control group. The changes of postural sway area in the experimental group 1 was significantly greater than that of the experimental group 2. Conclusion: The result of this study suggest the task-related circuit exercise program combined with sensorimotor training is an effective intervention to improve balance and gait in stoke patients.

• 대한물리의학회지
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• 제9권4호
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• pp.475-483
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• 2014

PURPOSE: The purpose of the study was to determine the effects of close kinetic chain resistant exercise of lower extremity on the gait with stroke patients. METHODS: The subjects were 50 patients who were diagnosed with cerebrovascular accident. They were randomly assigned either to a close kinetic chain resistant exercise of lower extremity group (study group)(n=25) or open kinetic chain resistant exercise of lower extremity exercise group (control group)(n=25). Gait abilities were measured by using Timed Up & Go (TUG) test, Functional Gait Assessment (FGA) and spatio-temporal gait variable that were velocity, cadence, stride length, double limb support by 3 axises wireless accelerometer and sway angle of center of mass by same instrument. RESULTS: Study group and control group before and after the intervention there were significantly difference in TUG, FGA, spatio-temporal gait variables and sway angle of center of mass (p<.05). There were significantly different between study group and control group for all variables at post-exercise. CONCLUSION: When all is said and done it is expected to be used as a method for the treatment and prevention in the process of rehabilitation of patients with stroke. In its final analysis when applying resistant exercise of lower extremity to stroke patients' gait, close kinetic chain is more effective than open kinetic chain.

• 한국해양공학회지
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• 제27권6호
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• pp.56-64
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• 2013

Crabbing motion is the pure sway motion of a ship without surge velocity. Thus, it can be applied to a berthing operation. Crabbing motion is induced by a peculiar operation method called the push-pull mode. The push-pull mode is induced by using a combination of the main propeller and side thruster. Two propellers generating the same amounts of thrust and rotating in opposite directions produce some yawing moment on a vessel but do not induce longitudinal motion. With the additional operation of side thrusters, the push-pull mode is used to induce a large amount of lateral force. In this paper, three-degree-of-freedom equations of motion such as for the surge, sway, and yaw are constructed for the crabbing motion. Based on these equations of motion, a feedback linearization control method is applied to auto-berthing control for a twin-screw ship with side thrusters. The controller can deal with the nonlinearity of a system, which is present in the berthing maneuver of a twin screw ship. A simulation of the auto-berthing of a ship is performed to validate the performance of the designed controller.

• Physical Therapy Rehabilitation Science
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• 제12권3호
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• pp.320-326
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• 2023

Objective: The purpose of this study is to investigate the impact of visual biofeedback methods utilizing pressure sensors on the static balance of stroke patients. Design: Randomized crossover study. Methods: A total of 27 patients with hemiparesis participated in this study. The following three feedback conditions were considered: condition 1 (Knowledge of performance feedback), condition 2 (Knowledge of result feedback), and condition 3 (None feedback). A force plate was used to measure static balance. The total sway length, average sway velocity, x-axis excursion, and y-axis excursion of the center of pressure were measured. One-way repeated-measures analysis of variance was employed for comparisons of variables between each condition. The statistical significance level was set at α = 0.05 for all analyses. Results: There was a significant difference in the static balance results between each feedback condition (p<0.05). In the post-hoc results, it was confirmed that the static balance was significant in the order of knowledge of performance feedback, knowledge of result feedback, and none feedback. Conclusions: When comparing the three conditions, it was observed that knowledge of performance feedback showed the most improved effect on static balance ability. As further research progresses, that this approach could be used as an effective intervention method in clinical settings.

• Physical Therapy Rehabilitation Science
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• 제2권2호
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• pp.115-118
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• 2013

Objective: Whole body vibration training is a relatively new approach for enhancement of muscle strength, physical performance, and balance. The aim of this study was to assess the effect of unilateral whole body vibration training. Design: One group pretest-posttest design. Methods: Sixteen healthy, physically active volunteers participated in this study. Whole body vibration was applied with a frequency of 20 Hz and an amplitude of 3 mm for 3 minutes. Muscle performance and static balance were assessed before and after unilateral whole body vibration training. One leg standing broad jump test was measured to determine muscle performance which is closely linked to lower extremity muscle function. The good balance system was used in evaluation static balance. All test were measured 3 times and the average value was analyzed. Results: Jumping length was significantly improved by 0.11m in all participants after intervention (p<0.05). Among static parameters, significant results were observed where in the eyes opened condition, X-speed (medial-lateral sway) changed from 4.20 mm/s to 4.95 mm/s, Y-speed (anterior-posterior sway) changed from 5.77 mm/s to 6.54 mm/s and velocity moment changed from $12.77mm^2/s$ to $13.57mm^2/s$ (p<0.05). In the eyes closed condition, X-speed changed from 4.34 mm/s to 4.85 mm/s, Y-speed changed from 7.84 mm/s to 8.16 mm/s and velocity moment changed from $16.03mm^2/s$ to $16.11mm^2/s$ (p<0.05). Conclusions: Immediate unilateral whole body vibration improved muscle performance but impaired static balance in young adults.

• 대한물리치료과학회지
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• 제26권3호
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• pp.70-75
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• 2019

Purpose: The purpose of this study was to investigate the changes of static and dynamic balance control ability according to the stability of shoes in elderly woman and female university student. Design: Cross-sectional study. Methods: Six elderly women and seven female university students were recruited for this study. The subject's static and dynamic balance were evaluated while wearing two different types of shoes (comfortable running shoe and masai walking shoe). The BT4 system was used to measure the static (postural sway area and velocity) and dynamic balance (limit of stability on forward, backward and left and right side). The measurement of static and dynamic balance control ability was performed in standing posture wearing comfortable running shoes and masai walking shoes. Results: In the static balance control ability, both female university students and elderly women showed significant increase in postural sway area and velocity when wearing unstable shoes (p<0.05) In addition, in the dynamic balance control ability, both female university students and elderly women showed significant decrease in limit of stability on forward and backward when wearing unstable shoes (p<0.05). Conclusion: In selecting shoes for the elderly, the stability of shoe should be considered for prevention of falls.

• 디지털융복합연구
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• 제12권7호
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• pp.297-304
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• 2014

본 연구는 가정운동프로그램이 뇌졸중 환자의 균형능력회복에 미치는 효과를 알아보기 위하여 실시하였다. 본 연구는 2013년 9월에서 2013년 12월까지 실시하였으며, 대상자는 총 20명으로 일반적인 통원 물리치료를 실시한 조군 10명, 일반적인 통원 물리치료를 실시하고 추가적으로 가정운동프로그램을 실시한 운동군 10명으로 나누어 배정하였다. 가정운동프로그램은 신경계 물리치료사가 대상자 집을 방문하여 8주동안 주 2회씩 매회 30분간 시행하였으며 체중이동훈련, 지구력훈련, 운동재훈련, 감각재훈련, 하지운동으로 구성되었다. 균형능력을 평가하기 위하여 Biorescu를 이용하여 족저압, 안정성한계, 동요속도를 측정하였고 임상적인 측정방법 중 하나인 기능적 팔뻗기 검사를 실시하였다. 연구결과 대조군과 운동군은 안정성한계, 동요속도, 기능적 팔뻗기 검사에서 유의한 차이가 나타났다. 본 연구는 가정운동프로그램이 뇌졸중 환자의 균형회복을 회복하는데 효과적인 치료전략 중 하나라는 것을 나타낸다.

• 한국콘텐츠학회논문지
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• 제14권9호
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• pp.120-130
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• 2014

이 연구는 여성 노인들에게 15주간 라인 댄스 운동 프로그램을 실시하게 한 후 자세 제어와 반응 메커니즘을 관찰할 목적으로 균형성 요인을 분석해 낙상 예방을 위한 운동 중재 효과를 규명하고자 했다. 이를 위해 65세 이상 16명이 선정되었다. 균형성 판단 요인은 정적 직립 상태에서 압력 판에서 25초 서있는 동안 압력 판의 6가지(3방향 힘, 3방향 모멘트) 자료를 수집해 이를 바탕으로 좌우 및 전후 압력중심 변동폭, 이들의 압력 중심 속도, 흔들림 면적을 분석했다. 분석한 결과 라인 댄스 활동 후 전후 압력 중심의 변화 범위(p<.01)와 압력 중심의 평균 속도(p<.05)는 크게 감소를 보였다. 또한 흔들림 면적은 라인댄스 후 유의한 감소를 보였다(p<.001). 좌우 방향의 압력중심 범위와 속도는 큰 감소를 보이지 않았다. 앞으로 이와 유사한 연구를 수행하고자 할 때는 운동 중재 효과를 실제 낙상과 관련해 연구할 필요가 있으며, 또한 균형성 판단 요인을 신체계뿐만 아니라 전정계, 감각계 등을 관찰하는 연구가 필요하리라 본다.

• 한국융합학회논문지
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• 제8권7호
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• pp.295-304
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• 2017

본 연구의 목적은 관절가동술과 탄력테이핑을 무릎 관절염 환자에게 적용하여 기립균형에 미치는 즉각적인 영향을 알아보고자 한다. 무릎 관절염 환자 30명은 테이핑군, 관절가동술군, 관절가동술과 탄력테이핑 융합 적용군으로 10명씩 나누어 무작위 배치되었다. 기립균형능력 평가는 발바닥 압력 측정기를 이용하였고, 눈 뜬 상태와 눈 감은 상태에서 자세 동요, 이동거리, 평균속도를 평가하였다. 중재 직후 세 군 모두 눈 감은 상태에서 자세 동요에 유의한 개선이 있었고, 융합 적용군은 이동거리, 평균속도에서도 유의한 개선을 보였다. 하지만 세 군간 기립균형 능력에서는 유의한 차이는 없었다. 관절가동술과 테이핑 모두 눈 감은 상태에서 기립균형에 효과적인 방법이었고, 두 중재방법을 융합했을 때 다양한 균형 변수에 효과적인 것을 확인할 수 있었다. 따라서 무릎 관절염 환자에게 두 중재방법을 융합하여 적용할 것을 권고한다.

• 한국항해항만학회지
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• 제45권6호
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• pp.284-297
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• 2021

본 연구에서는 선박의 운항 데이터를 기반으로 조종성능을 모사할 수 있는 단순 운동학 모델을 제안하였다. 수평면 3자유도 각 방향의 속도 성분을 1차 미분방정식의 해 형태의 단순모델로 두고, 계수에 대한 운항데이터 학습을 수행하였다. 실제 선박의 충분한 운항 데이터의 확보는 어렵거나 제한적이므로, 본 연구에서는 실 운항 데이터 대신 공개된 동역학 모델을 활용하여 임의의 제어입력에 대한 시뮬레이션 결과를 얻고, 이를 운항데이터 학습에 활용하였다. 제어입력인 프로펠러 회전수 및 타각을 임의로 부가하여 동역학 시뮬레이션을 수행하고 각 속도 성분 출력을 얻었다. 충분한 시간 동안 동역학 시뮬레이션의 제어 입력과 속도 출력을 학습하여 각 제어 입력에 대한 운동학 모델 내 계수인 시정수 3개, 수렴속도성분 3개의 분포를 도출하였다. 추가로 임의의 제어 입력에 의한 선회 시뮬레이션 결과들과 비교함으로써 단순 운동학 모델의 성능을 검증하였다. 도출된 시정수들의 분포에는 다소 분산이 있으며, 제어 입력 이외의 관련 변수를 더 추가하여 정확도를 높이는 추후 연구가 필요하다.