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가상 자전거 시스템을 이용한 고령자의 평형감각 증진에 관한 연구
정성환,박용군,정우석,권대규,홍철운,김남균,Jeong Sung-Hwan,Piao Yong-Jun,Chong Woo-Suk,Kwon Tae-Kyu,Hong Chul-Un,Kim Nam-Gyun 대한전자공학회 2005 電子工學會論文誌-SC (System and control) Vol.42 No.6
본 연구에서는 가상현실기술과 자전거를 이용하여 평형감각 실조환자의 진단 및 시각, 전정감각, 체성감각 등을 효율적으로 진단하고 자극, 훈련시킬 수 있는 자전거 시뮬레이터 시스템을 개발하였고, 이 시스템이 평형감각 훈련에 대한 효과를 고찰하였다. 실험 방법은 20대의 건강한 젊은 성인과 70대의 노인을 대상으로 자전거 주행 시에 나타나는 주행시간, 주행속도, 중앙선이탈도, 무게이동과 무게중심의 변화를 측정하여 가상 자전거 시스템이 평형감각 훈련에 어떠한 영향을 미치는지에 대한 유용성을 분석 하였다. 실험결과, 20대의 젊은 성인과 70대의 노인이 훈련 후 주행속도와 주행시간 중앙선 이탈도가 감소하였고, 좌우 무게이동과 무게중심 면적이 모두 감소하였으며 시각적 피드백의 효과가 평형감각에 더욱 유용하다는 결론을 얻었고 시각적 피드백의 효과를 이용하여 복합 감성정보를 활용한 헬스기구나 평형감각 재활 훈련에 활용할 수 있음을 알 수 있었다. In this paper, a new rehabilitation training system was developed to improve equilibrium sense by combining virtual reality technology with a fixed exercise bicycle. The subjects consisted of two groups. A group of young people, was compared against a group of elderly. We measured three different running modes of virtual bicycle system with two successive sets. The parameters measured were running time, velocity, the weight movement, the degree of the deviation from the road, and the variables about the center of pressure. The repeated training, our results showed that the running capability of the elderly improve compared. In addition, it was found out that the ability of postural control and the equilibrium sense was improved with the presentation of the visual feedback information of the distribution of weight. From the results of this experiment, we showed that our newly developed system might be useful in the diagnosis of equilibrium sense or in the improvement of the sense of sight and, somatic, and vestibular sense of the elderly in the field of rehabilitation training.
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정성환,이영신,Chung, Sung-Hwan,Lee, Young-Shin 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3
A nuclear spent fuel shipping cask is required by IAEA and domestic regulations to withstand a 9m free drop condition. In this paper, the structural analysis under the 9m side drop condition was performed to understand the dynamic impact behavior and to evaluate the safety of the cask for 7 PWR nuclear spent fuel assemblies. The analysis result was compared with the measured value of the 9m side drop test for the 1/3 scaled-down model and the accuracy of the 3D analysis was confirmed. Analysis in accordance with the diameter of impact limiters for the proto-type cask were performed. Through the analysis, the impact behaviors due to the side drop and the effects dependent on the diameter of impact limiters were grasped. Maximum stress intensities on each part of the cask were respectively calculated by using the stress evaluation program and the structural safety of the cask was finally evaluated in accordance with the regulations.
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정성환 한국산업경영시스템학회 2013 한국산업경영시스템학회 학술대회 Vol.2013 No.추계
Virtual metrology(VM) is a promising technology which can convert off-line sampling inspection into on-line total inspection at the manufacturing process. This paper provides an economic evaluation model of VM system which predicts the defects of a target process with Bernoulli sampling inspection. For this purpose, we build M/G/1 queueing models of two systems. One is VM non-applied system and the other is VM applied one. We derive total costs per unit time of each system and conduct sensitivity analysis according to variations of input parameters such as defect rates, various process costs and VM prediction error rates. The proposed analysis model is expected to be used for evaluating economic values of VM system implementation projects.
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정성환 대한의사협회 2009 대한의사협회지 Vol.52 No.1
Different types of interstitial lung diseases (ILDs) develop in collagen vascular diseases (CVDs) such as scleroderma, rheumatoid arthritis, systemic lupus erythematosus, dermatopolymyositis, Sjogren’s syndrome, and mixed connective tissue disease. These CVDs represent various histological patterns, including usual interstitial pneumonia, desquamative interstitial pneumonia, nonspecific interstitial pneumonia, bronchiolitis obliterance organizing pneumonia, diffuse alveolar damage, and bronchiolitis. The clinical presentations, prognosis, and response to treatment vary depending on the underlying CVDs, as well as histological patterns of ILDs. In general, the prognosis and survival rate of ILDs in CVDs are better than idiopathic ILDs. Optimal treatment also varies depending on the type of CVDs and the presence of interstitial lung disease, although in many cases, a combination of corticosteroids and cytotoxic drugs are given.
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