• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.1048-1051
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• 2011

이 논문은 뇌졸중 환자를 대상으로 하여 불안정한 지지면에서의 균형 훈련이 안정 지지면에서의 균형 훈련과 비교하였을 때 균형 능력 향상에 어떠한 영향을 주는지 알아보고자 한다. 연구 대상자는 뇌졸중 환자 30명으로 안정지지면 운동군과 불안정 지지면 운동군으로 분류하여 주 3회 6주동안 실시하였다. 균형능력의 측정은 Good balance system를 사용하였다. 안정지지면 운동군에서는 속도모멘트만 감소하였고, 불안정 지지면 운동군에서는 내외측, 전후방, 속도모멘트에서 감소하여서, 안정 지지면 운동군보다 불안정 지지면 운동군에서의 운동이 균형 훈련이 좋은 것으로 나타났다. 눈을 감고 있을때는 눈을 뜨고 있을 때보다 안정 지지면과 불안정 지지면에서의 균형정도는 감소하는 것으로 나타났다. 따라서, 안정지지면에서의 균형훈련보다 불안정 지지면에서의 훈련이 더 효과가 있는 것으로 나타났다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.8
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• pp.3587-3593
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• 2011

This study was to investigate the balancing and clinical abilities using stable and unstable surface of stroke patients who surface changes in balance of body. The subjects of this study were 30 stroke patients(16 males and 14 females). They were separated into two groups and did balance reinforcing exercise on stable and unstable surfaces for five times a week for six weeks. To evaluate their balancing ability, they performed functional standing balance test, functional forward arm stretching test. performance-oriented mobility assessment was performed. The balancing exercises were modified from preceding studies and consisted of 6 difference exercises. The functional standing test with open and close eyes and performance-oriented mobility assessment, the unstable surface exercise group and the stable surface exercise group improved significantly. The forward arm stretching test was the unstable surface exercise group improved. This study found that the balancing exercise on unstable surface was more effective than on stable surface for stroke patients. Thus, exercise on unstable surface has more positive effects on the improvement of balancing abilities of stroke patients.

• Proceedings of the Korea Contents Association Conference
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• 2012.05a
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• pp.365-366
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• 2012

본 연구는 교각운동시 불안정한 지지면과 안정적인 지지면을 제공하여 체간 및 하지의 근 활성도의 변화를 알아보고자 하였다. 이 연구의 대상자는 20대 남, 여 14명이었다. 실험방법은 일반적 교각자세와 다이나믹 에어쿠션을 이용한 교각자세를 실시한 후에 무선 8채널 표면근전도 검사기를 이용하여 체간부의 척추기립근, 복직근, 대퇴의 대퇴직근, 외측 슬괵근, 하퇴부의 전경골근, 비복근 외측두에서 근활성 정도를 측정하였다. 체간부의 척추 기립근, 대퇴이두근, 가자미근은 불안정한 지지면에서 근활성도가 높게 나타났다(p<.05). 따라서, 교각운동에서 불안정한 지지면의 제공은 신체의 배측에 위치한 근육의 활성화를 나타내어, 교각운동시 지지면의 안정성의 변화만으로도근육활성도의 변화가 가능함을 알 수 있었다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.3
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• pp.178-185
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• 2010

This paper presents the evaluation of foundation stability according to decrease of the foundation contact area on the ground. In order to carry out this research, the experimental and numerical studies are performed. In the experimental study, the carefully controled laboratory model tests are carried out with different foundation size and types. The model test results are analyzed and interpreted by analytical and numerical calculation in order to verify both results obtained from experimental and numerical studies. It is clearly found from the results that the foundation stability is considerably reduced when the foundation contact area ratio is less than 75%. This research may be very useful to develop the economical foundation type.

• Journal of Digital Convergence
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• v.10 no.1
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• pp.399-405
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• 2012

The purpose of this study was to compare the shoulder stabilizer muscle activity during a push up plus on a different conditioning surface. Eighteen healthy volunteers were tested. Surface EMG was recorded from the upper trapezius(UT), pectoralis major(PM), and serratus anterior(SA) using surface differential conditions. Measurements were performed for 7 days. The mean root mean square (RMS) of EMG activity was calculated. A one-way repeated measures analysis of variance was performed to compare RMS normalized values. The UT and PM did not show significant differences of electric activation amplitude in relation to different surface conditions(p>.05). However, the SA showed greater mean electric activation amplitude values on the push up plus exercise on a upper and lower unstable surface(p<.05). These results suggest that to improve SA EMG activity is more useful when performed on a upper and lower unstable surface conditions than on a stable surface conditions.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.05a
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• pp.580-583
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• 2018

Purpose: The purpose of this study was to compare the effects of ankle balance training on unstable and stable surfaces to discover on which surface the proprioception, balance and muscle strength of obese middle aged women improves more. Method: 30 obese middle-aged women were randomly recruited and divided into two groups (training on an unstable surface, training on a stable surface). The subjects in each group participated in the training for six weeks, three times per week for 30 minutes each session. Proprioception was measured using Dualer IQ digital inclinometer; sway length (SL) and sway area (SA) of center of pressure, and limit of stability (LOS) were measured for balance; muscle strength before and after the training was measured using manual muscle testing. Results: There were significant improvements in the subscales of the proprioception, balance and muscle strength in those who participated in ankle balance training on the unstable surface, and in those who participated on the stable surface. Therefore, the training of participants on unstable and stable surfaces did not identify which ankle balance training technique was more effective. Conclusion: Unstable and stable surface ankle balance training are both effective in improving the proprioception, balance and muscle strength of obese middle-aged woman.

• Journal of the Korea Convergence Society
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• v.10 no.7
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• pp.47-54
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• 2019

The purpose of this study was to investigate the effect of visual conditions on the static balance of stable and unstable surfaces. Thirty healthy adults participated in this study (13 men, 17 women). Visual conditions were set as vertical, horizontal, and diagonal. It was performed on the pad to measure the balance on the unstable support surface. Using the balance measuring instrument, the General Stability Index, Weight Distribution Index, and Weight Distribution was measured. Paired t-tests were used for ground-based comparisons and one-way ANOVAs were used for comparisons within the same ground. The general stability index showed a significant difference according to the horizontal and vertical line directions on the stable support surface(p<.05). According to the comparison between the grounds, the weight distribution index on the unstable support surface showed a significant difference(p<.05). Weight distribution showed significant differences between the left and right eyes on the support surface with the stable and the unstable horizontal visual condition(p<.05). In static balance training, vertical and diagonal visual direction conditions are predicted to be helpful for training.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2003.03a
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• pp.51-66
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• 2003

최근 용지매입의 제한과 자연환경훼손의 최소화를 도모하는 사회적 환경으로 인해 대단면 근접병설터널 계획이 점차 증가하고 있다. 지금까지는 주로 중앙벽체부의 지지기능을 활용한 2Arch터널의 형태로 도심지 지하철의 정거장이나 고속도로의 일부구간에 계획되고 있으나, 대단면 근접병설터널에 대한 시공실적 및 설계사례가 부족한 국내에서는 이에 대한 역학적 거동과 합리적 시공방안에 대한 연구가 미흡한 실정이다. 따라서, 대단면 근접병설터널에 대한 국내·외의 설계 및 시공사례를 정리·분석하므로서 차후 제한된 구간에서의 터널계획시 합리적인 설계 및 시공이 되고자 하였다. 또한, 최근 도심지 구간에 계획중인 터널의안정성 검토 사례를 중심으로 터널 및 인접구조물, 중앙필러부 및 콘크리트 라이닝에 대한 상세 안정성 검토방법을 고찰함으로써 기존 병설터널의 거동특성과는 구별되는 대단면 근접 병설터널의 안정성 평가기법에 대한 방향을 제안하였다.

• Journal of the Korean GEO-environmental Society
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• v.17 no.10
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• pp.13-22
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• 2016

An optimized spudcan was designed for the Southwestern Sea, an area mostly comprised of sand and soft clay layers. The spudcan was designed using guidelines by SNAME, ISO, and InSafeJIP, as well as the yield surface for combined loads. The probe test method was applied to define a yield surface used in estimating spudcan stability. Numerical analyses that considered vertical, horizontal, and moment loads in Southwestern Sea resulted in a design of 8 m diameter spudcan. Additionally, the empirical equations suggested by previous studies can estimate a reasonable spudcan bearing capacity at shallow depth. Each yield surface calculated from Mohr Coulomb and Hardening soil model showed different shapes, however the yield surface also grew with increasing spudcan diameter. This yield surface is a useful reference, along with site investigation results and published guidelines, to estimate the stability of a spudcan in the Southwestern Sea.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.227.2-227.2
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• 2012

대구경 고해상도 광학탑재체의 광구조부는 주반사경과 부반사경 등을 포함한 주요 광학부품들과 검출기를 포함한 초점면 조립부 등을 고정 지지해주는 부분으로, 발사시 전달되는 진동 및 우주 열환경하에서의 길이 안정성을 광학성능 범위내로 유지하여야 한다. 광학탑재체의 성능에 가장 큰 영향을 미치는 것은 주반사경과 부반사경의 광축방향의 길이 안정성으로, 광학탑재체의 작동 온도범위 내에서 수 마이크로미터 내외로 안정성이 요구된다. 이를 실현하기 위하여 주반사경과 부반사경의 간격은 열 및 흡습에 둔감한 탄소섬유 강화수지 복합재로 되어 있는 경통 구조물로 설계, 제작된다. 제작된 경통구조물의 길이 안정성을 검증하기 위해서는 별도의 정밀 측정장치가 필요하게 된다. 본 논문에서는 이러한 길이 안정성 측정장치에 대해 기술한다. 온도에 대해 변화가 거의 없는 (CTE<0.1ppm/K) Zerodur 소재의 막대 구조물을 기준 스케일로 삼았고, 이를 지지하기 위해 Invar 소재의 구조물을 사용 하였다. 주반사경의 베젤부위와 부반사경의 접속부위의 변위 변화를 세점에서 측정하여 길이 안정성을 측정할 수 있게 하였다.