• Journal of Digital Convergence
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• v.15 no.8
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• pp.391-400
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• 2017

The purpose of this paper is to present the effect of image stimulation on body stability as a conceptual model and to investigate the effect of image stimulus(2D, VR) on body stability(hand stability) through experiments Recently, stereoscopic images such as virtual and augmented reality are combined with smart phones and exercise equipments, and the diffusion is becoming active. The possibility of a safety accident or human error is also increasing as it temporarily affects the balance of the body and hand stability after the image stimulus is removed. The conceptual model is presented based on the results of previous studies. Based on the experimental results, the conceptual model has been explained in combination with the human information processing process and cognitive resource models that take place in the brain. Twenty subjects were exposed to 2D and VR stimuli, and display fatigue was measured by cybersickness questionnaire and hand stability by hand steadiness tester. Experimental results show that VR images induce higher display fatigue and lower hand stability than 2D. In this study, it is meaningful that hand stability according to image type and display fatigue level which have not been tried yet is revealed through conceptual model and experiment.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.6 no.1
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• pp.35-49
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• 2000

허리 근육손상은 기대치 못한 상황에서 신체의 적절한 반응이 지연될 경우 근육 염좌와 같은 상해나 요통으로 연결된다. 이 연구는 척추 안정 운동 후 척추의 유연성과 척추 근육의 반응 속도를 만성 요통 환자와 정상인을 대상으로 비교 연구 하였다. 만성 요통 환자 군은 척추 안정 운동을 4주간 20회 시행하였으며 이와 비슷한 특성을 가진 대조군을 비교하였다. 신체 유연성은 환자가 앉은 자세에서 척추를 축으로 신체의 회전 정도를 측정하였다. 척추 반응 속도 측정은 환자가 선 자세에서 두 손으로 판을 들고있는 동안 정구공이 1.8 m (6.4 N)에서 낙하시 좌, 우측 척추 근육의 반응 속도를 Wavelet 분석으로 측정하였다. 연구 결과 척추 안정 운동을 행한 만성 요통 환자군의 신체 유연성과 척추 근육 반응 속도가 통계적으로 유의하게 증가하였다. 척추 유연성은 만성 요통 환자 군에서 131.0cm에서 척추안정 운동후 144.1cm으로 증가하였다 (p<0.05). 척추 근육 반응 속도는 척추 안정 운동을 행한 만성 요통 환자 군에서 90.00msec에서 68.55msec로 (p<0.05), 정상 군에서는 86.28msec에서 75.64msec로 (p>0.05) 단축되었다. 척추 안정 운동은 근, 신경 조직의 반응속도를 증가시키며 특히 만성 요통 환자에서 척추의 안정성을 회복시킨다. 특히 척추의 안정성 증가는 기대치 못한 상황에서 선체의 적절한 반응의 속도를 회복시키며 결과적으로 허리 손상을 예방 할 수 있다. 물리치료학에서 근 골격 신경계의 반응 속도측정을 위한 연구로 Wavelet 분석과 같은 첨단장비를 통한 운동 치료의 질에 관한 연구의 도입이 필요하다. 또한 구체적인 치료적 운동결과의 측정을 통해 물리 치료의 효과성과 효율성을 높이기 위한 생체 의학적 연구가 요망된다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2007.11a
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• pp.52-52
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• 2007

치과 임플란트는 주로 Ti 합금으로 이루어지며 구강내 또는 체내에 매식되기 때문에 다양한 신체용액에 노출될 수 있다. 본 연구에서는 국내에서 제조된 티타늄 임플란트를 이용하여 수종의 신체유사용액에서 전기화학적인 방법을 통해 각각의 부식 안정성을 평가하였다.

• Journal of Korean Ophthalmic Optics Society
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• v.21 no.3
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• pp.259-264
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• 2016

Purpose: To establish the cause of decrease in body stability and to analyze the effects on sensory organs maintaining static balance according to the induced astigmatic blur. Methods: Twenty subjects (10 males, 10 females; mean age, $23.40{\pm}2.70years$) were participated in this study. To induce myopic simple astigmatism, the axis directions of cylindrical lenses were placed $180^{\circ}$ on both eyes (with-the-rule), $90^{\circ}$ on both eyes (against-the-rule), and $45^{\circ}$ on both eyes (oblique). Cylindrical lenses of +0.50, +1.00, +1.50, +2.00, +3.00, +4.00, and +5.00 D were used to increase astigmatic blur in each astigmatism types. General stability (ST) and sway power (SP) in frequencies by each sensory organs were analyzed using the TETRAX biofeedback system. Results: ST in the all astigmatism types were raised with increase of astigmatic blur compared to full corrected condition, but a significant difference only showed in the induced oblique astigmatism. According to the results of correlation analysis between ST and SP in the each frequencies with increase of astigmatic blur, the causes of increased ST in the induced oblique astigmatism showed to have a high correlation in order of somatosensory system (high-medium frequency), central nervous system (high frequency), peripheral vestibular system (low-medium frequency), and visual system (low frequency). Conclusions: The visual information by uncorrected oblique astigmatism may disturb the normal functions of all sensory organs maintaining body balance, consequently, the body stability can be reduced. Therefore, optimal correction of astigmatism can play an important role for reducing the instability of body balance.

• The Journal of the Korea Contents Association
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• v.13 no.4
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• pp.273-280
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• 2013

This study aims to examine the influences of wearing an occlusal biteplane splint on balance of the body. 10 subjects were selected who had neither impaired occlusion and masticating systems nor difficulty in walking along with no medical history in temporomandibular joint. Measurements were conducted with the Fukuda stepping test, the limits of stability test. The level of significance, ${\alpha}$ to determine the statistical significance was .05. Fukuda stepping test and the limits of stability test were put to the Wilcoxon signed test. As a result of this study, there was a significant difference in the moving distance in the Fukuda stepping test (p<.05). In addition, there were significant differences in the results of the limits of stability test (p<.05). In conclusion, the results of this study suggest that wearing the occlusal biteplane splint has an positive influence on the balance of the boby.

• Journal of the Korea Convergence Society
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• v.11 no.4
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• pp.87-93
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• 2020

The purpose of this study was to examine the convergence correlation between physical characteristics and functional movement screen(FMS). Overall, 193 adults with normal single measurement values participated in the study. For data analysis, we used the SPSS Ver. 26.0 statistical program to perform t-tests and to determine Pearson's correlation coefficients for variables. Data analysis revealed significant sex differences in the active straight-leg raise and trunk stability push up tests (P<.05). In addition, our data analysis also revealed a negatively correlation between body fat percentage and FMS tests, except in the shoulder mobility and active straight leg raise test. In the active straight leg raise, the quality of functional movement was higher in women than in men; while in the trunk stability push ups, the quality of functional movement was higher in men than in women. Therefore, we conclude that men should reinforce the flexibility of the lower extremities, and females should apply upper body muscular strength for better trunk stability movement.

• Korean Journal of Ecology and Environment
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• v.52 no.4
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• pp.358-365
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• 2019

We measured the body composition, including bone mineral density (BMD) and food resource availability using dual energy X-ray absorptiometry and the carbon and nitrogen stable isotope ratios of body condition of 4 anuran species(Hyla japonica, Glandirana rugosa, Pelophylax nigromaculatus, Lithobates catesbeianus) in South Korea. Additionally, the carbon and nitrogen stable isotope ratios were employed to determine the food resource availability of anurans. We figured out the relationship between the body composition, including BMDs and food resource availability. The body composition and BMDs did not differ between male and female while there was difference among the species. Food resource availability and BMDs were the highest in L. catesbeianus, the lowest in H. japonica. BMDs tended to increase with higher food resource availability. Body composition and BMDs, which represent the body condition of an individual, can be used as an ecological indicator to assess the stability of the habitat of anurans.

• Korean Journal of Applied Biomechanics
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• v.18 no.1
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• pp.203-212
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• 2008

The purpose of this study is to propose appropriate model for 3 staged Didimsae movement to Jajinmori rhythm and to provide information for ideal foot step movements. For the locational change of body center, the height of body center is lowered at the moment of forward step and during forward intersection of the feet, forward direction linear motion is converted to vertical motion to maintain stability. Speed change of body center reduces flow of body on step forward moment and controls rapid forward movement for stabled movement and position when preventing fast forward horizontal direction movement of centroid speed while knee joint and foot joint are vertically risen for heel bone contacts the ground. For angle changes of joints, in order to prevent hyperextension of lower leg, hip joint is extended and knee joint is curved to secure stability of movement for smooth curves and extension. When centroid of foot joint is moved from top of the feet to whole foot sole and when left foot makes dorsal curve, stabled movement is accomplished.

• Journal of the Korea Convergence Society
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• v.11 no.4
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• pp.359-367
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• 2020

This study is a descriptive research to identify the factors affecting the mental health of nursing aides. The subjects were 227 nursing aides working in the metropolitan area of South Korea, and the survey was conducted in October 2019 using the structured questionnaires. The results showed that the factors affecting mental health of nursing aides were emotion stability, emotional intelligence, occupational stress, and subjective perception of physical health, and their explanatory power for mental health was 64.6%. As a result, it is necessary to develop an intervention program to improve emotion stability, emotional intelligence, occupational stress, and subjective perception of physical health in order to improve mental health of nursing aides.

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.94-96
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• 2012

본 연구는 물리치료학과 학생들을 대상으로 젊은 여성 신발의 높이 차이가 신체의 정렬과 균형에 미치는 영향을 알아보고자 연구를 실시하였다. 평균 나이 20.5세인 여대생을 대상으로 걷기 운동을 통한 높이를 같게 한 신발의 종류에서의 실험 전과 후의 신체 정렬과 균형에 관해 비교분석하였다. 통계처리 방법으로 실험 전 후 차이를 검증하였고, 모든 통계적 유의수준은 0.05로 하였다. 본 연구의 결과 신발의 종류에 따른 신체정렬의 변화에서 7cm의 높은 힐과 편평힐은 몸통 경사, 불안정성에서 통계적으로 유의하지 않았다. 안정된 지면 및 불안정 지면에서 신발 종류에 따른 체중분포도와 정적 안정감에서 통계적으로 유희한 증가를 보였다. 향후 신발 굽의 지지면 면적의 비교뿐 아니라 좀 더 다양한 여성의 신발 굽을 비교분석하고 굽 높이와 신체 정렬간의 상관성 분석을 밝힐 필요성이 있다고 본다.