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보행 장애인을 위한 능동형 보행훈련 시스템 개발 및 평가
황성재,태기식,강성재,김정윤,황선홍,김한일,박시운,김영호,Hwang, S.J.,Tae, K.S.,Kang, S.J.,Kim, J.Y.,Hwang, S.H.,Kim, H.I.,Park, S.W.,Kim, Y.H. 대한의용생체공학회 2007 의공학회지 Vol.28 No.2
Modem concepts of gait rehabilitation after stroke favor a task-specific repetitive approach. In practice, the required physical effort of the therapists limits the realization of this approach. Therefore, a mechanized gait trainer enabling nonambulatory patients to have the repetitive practice of a gait-like movement without overstraining therapists was constructed. In this study, we developed an active gait training system for patients with gait disorder. This system provides joint movements to patients who cannot carry out an independent gait. It provides a normal stance-swing ratio of 60:40 using an eccentric configuration of two gears. Joint motions of the knee and the ankle were evaluated with using the 3D motion analysis system and compared with the results from the multi-body dynamics simulation. In addition, clinical investigations were also performed for low stroke patients during the 6-week gait training. Results from the dynamics simulation showed that joint movements of the knee and the ankle were affected by the gear size, the step length and the length of the foot plate, except the radius of curvature of the foot guide plate. Also, the 6-week gait training revealed relevant improvements of the gait ability in all low subjects. Functional ambulation category levels of subjects after training were 2 in three patients and 1 in a patient. The developed active gait trainer seems feasible as an adjunctive tool in gait rehabilitation after stroke.
콘크리트 포장의 두께, 휨강도, 평탄성 그리고 압축강도가 콘크리트 포장의 수명에 미치는 영향 분석
황성재 慶熙大學校 大學院 2010 高凰論集 Vol.46 No.-
This research was conducted to investigate the effects of concrete thickness, flexural strength, surface smoothness and compressive strength. The factors were analyzed using AASHTO equations to evaluate how much those affect the concrete pavement performance. The analysis results showed that concrete thickness, flexural strength, surface smoothness and compressive strength affected significantly the concrete pavement performance and the sensitive ratio among the concrete thickness, flexural strength, surface smoothness and compressive strength was 12 : 6 : 3 : 2. 본 연구는 콘크리트 포장의 수명에 미치는 여러 가지 인자들 중에서 AASHTO 피로 파손 공 식으로 분석 할 수 있는 콘크리트 포장의 두께, 휨강도, 평탄성, 압축강도에 대해 콘크리트 포 장의 각 인자가 콘크리트 포장의 공용성 즉, 각 인자들의 손실이 콘크리트 포장의 설계 수명에 어떠한 영향을 미치는지 분석 하였다. 분석에 의하면 콘크리트 포장의 두께, 휨강도, 평탄생, 압 축강도는 콘크리트 포장의 수명에 지대한 영향을 미치며 각 인자의 초기 손실이 콘크리트 수명 에 미치는 민감도는 두께 : 휨강도 : 평탄성 : 압축강도 = 12 : 6 : 3 : 2로 나타났다.
콘크리트 포장의 공용성 기반 지불규정 적용을 위한 콘크리트 휨강도 및 표면 평탄성에 관한 분석
황성재,김성민,이석근 한국도로학회 2009 한국도로학회논문집 Vol.11 No.4
This study was conducted to investigate the effects of concrete flexural strength and surface smoothness, which were pay factors of concrete pavements, on pavement performance, and to develop the methodologies to determine the proper allowable ranges according to the magnitudes of those pay factors. The concrete flexural strength was analyzed using the AASHTO, power, and linear fatigue failure models, and the surface smoothness was analyzed for the roughness indices of PSI, IRI, and PrI using the AASHTO model. The analysis results showed that the allowable range of the flexural strength should be determined using the rate between the deficiency and strength, and the penalty should be linearly proportional to the strength deficiency rate because the linear relationship between the strength deficiency rate and the reduction in pavement life was observed. As the initial surface smoothness became better, the smoothness deficiency rate should be larger. The penalty due to the surface smoothness deficiency should also be linearly proportional to the smoothness deficiency rate. 본 연구는 콘크리트 포장의 지불규정 인자 중 콘크리트 휨강도와 표면 평탄성이 콘크리트 포장 공용성에 미치는 영향에 대하여 분석하고, 이러한 인자에 대한 지불규정을 적용할 때 인자의 크기에 따른 적절한 허용범위를 결정하는 근거를 마련하기 위하여 수행되었다. 콘크리트의 휨강도에 대하여 AASHTO, 지수형, 선형 피로파손 공식 등의 공용성 모델을 이용하여 분석을 수행하였으며, 콘크리트 포장의 표면 평탄성에 대해서는 PSI, IRI, PrI 등의 평탄성 지수와 AASHTO 피로파손 공식을 사용하여 분석을 수행하였다. 연구 결과, 휨강도의 허용 기준은 휨강도 손실률(손실량/휨강도)을 기준으로 하여야 하며, 휨강도 손실률이 증가할수록 설계수명이 선형으로 감소하기 때문에 이에 적절하게 공사비를 차감 지급해야 하는 것을 알 수 있었다. 표면 평탄성은 초기 평탄성이 우수할수록 평탄성 지수의 손실률을 크게 허용해야 하며, 휨강도와 같이 평탄성 지수 손실률과 포장 수명 감소가 선형으로 비례하므로 공사비 차등 적용도 이에 적절하게 하여야 한다는 것을 알 수 있었다.
한국 고령자의 일상생활 중 다양한 높이에서의 STS(sit-to-stand) 시 관절운동 특성 및 근길이 변화 분석
황성재,손종상,김정윤,김현동,임도형,김영호,Hwang, S.J.,Son, J.S.,Kim, J.Y.,Kim, H.D.,Lim, D.H.,Kim, Y.H. 대한의용생체공학회 2008 의공학회지 Vol.29 No.6
Sit to stand(STS) movement is one of the most common activity in daily life. In addition, Korean traditionally stand up from various sitting heights in one's daily life compared to other foreigners. As Korea enter rapidly to the aging society, needs of the elderly's independent life are increasing. Therefore the importance of research about the analysis of elderly's activity in daily life is rapidly increasing. In this study, we analyzed joint movements and changes of muscle length during STS(sit-to-stand) at various sitting heights(table seat, bath seat, bottom) in the Korean elderly's daily life by using the motion analysis and musculoskeletal modeling. Ten Korean elderly and young were participated in this experiment. Three heights of sitting posture which could represent typical sitting in Korean daily life were chosen as table seat(42cm), bath seat(21cm) and bottom(0cm). As the results, the elderly showed both smaller knee/hip flexion and larger trunk flexion relatively in comparison to the young during table seat STS. The elderly also showed larger dorsiflexion and smaller ROM of knee, hip, trunk compared to the young during bath seat STS. Additionally, the elderly showed larger plantarflexion, hip flexion, smaller knee flexion and trunk flexion during the first half of bottom STS and larger knee flexion, hip flexion and trunk flexion during the second half of bottom STS. In addition, we could know contraction and relaxation characters of major muscles in lower limb during various STS through the analysis of changes in muscle length by musculoskeltal modeling.
마비 환자의 정상적 보행을 위한 능동형 단하지 보조기 개발
황성재,김정윤,황선홍,박선우,이진복,김영호,Hwang, Sung-Jae,Kim, Jung-Yoon,Hwang, Seon-Hong,Park, Sun-Woo,Yi, Jin-Bock,Kim, Young-Ho 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.2
In this study, we developed an active ankle-foot orthosis(AAFO) which can control dorsi/ plantar flexion of the ankle joint to prevent foot drop and toe drag during walking. 3D gait analyses were performed on five healthy subjects under three different gait conditions: the normal gait without AFO, the SAFO gait with the conventional plastic AFO, and the AAFO gait with the developed AFO. As a result, the developed AAFO preeminently induced the normal gait compared to the SAFO. Additionally, AAFO prevented foot drop by proper plantarflexion during loading response and provided enough plantarflexion moment as a driving force to walk forward by sufficient push-off during pre-swing. AAFO also could prevent toe drag by proper dorsiflexion during swing phase. These results indicate that the developed AAFO may have more clinical benefits to treat foot drop and toe drag, compared to conventional AFOs, and also may be useful in patients with other orthotic devices.