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허리 불안정성을 가진 성인에게 적용한 복합운동프로그램이 정적균형능력에 미치는 영향
오윤중,박종항,김윤환,김태원,Oh, Yoon-joong,Park, Jong-hang,Kim, Yoon-hwan,Kim, Tae-won 대한정형도수물리치료학회 2019 대한정형도수물리치료학회지 Vol.25 No.2
Background: The purpose of this study is to investigate the effect of the combined exercise program on the static balance ability of the lumbar instability of adults. Methods: The experimental group was divided into two groups and randomly. The experimental group 1 (Exp 1) applied the combined exercise program for the lumbar stabilization exercise and strengthening exercises and the experimental group 2 (Exp 2) applied the combined exercises program for the lumbar stabilization exercises and active stretching exercises. Each experiment group performed exercise program for 4 weeks, 3 times a week, 30 minutes a day. Static balance ability was measured using GOOD BALANCE system. Results: As the comparing results of static balance ability, normal standing eye open was Ant-Post and Med-Lat showed significant differences in Exp 1 (p<.05). One leg left eye open was velocity moment showed significant differences in Exp 1 (p<.05). and one leg right eye open was Med-Lat showed significant differences in Exp 1 (p<.05). Conclusion: These results show that thoracic self mobilization is immediate effective on balance and gait ability. Thus, thoracic self mobilization will help recovery of balance and gait ability in acute stroke patients.
지지면에 따른 과제 지향적 훈련이 발목 불안정성 환자의 통증과 기능 수준, 균형능력, 그리고 근 활성도 및 근 두께에 미치는 영향
오윤중,박종항,박삼호 대한정형도수물리치료학회 2022 대한정형도수물리치료학회지 Vol.28 No.1
Background: Task-oriented training on an unstable support surface is an effective intervention for improving the ankle joint stability and muscle strength in patients with ankle instability. This study examined the effects of balance training on an unstable support surface in patients with ankle sprains with ankle instability. Methods: Forty-four patients with ankle sprains participated in this study. Screening tests were performed and assigned to an experimental group, who performed task-oriented training on an unstable support surface (n=22), and a control group, who performed task-oriented training on a support surface (n=22) using a randomization program. All interventions were applied 3 times per week for 4 weeks. The numeric rating scale (NRS), cumberland ankle instability tool (CAIT), balance ability, muscle activity, and muscle thickness were compared to evaluate the effects of the intervention. Results: Both groups showed significant differences in the NRS, CAIT, balance ability, and muscle activity between before and after the intervention (p<.05). In addition, there were significant differences in balance ability, muscle activity, and muscle thickness between the experimental and control groups (p<.05). Conclusion: Task-oriented training on an unstable support surface is an effective intervention for improving the balance ability, muscle activity, and muscle thickness during contraction.
연료분무 및 연소 2 : 연료 분사압력 및 분위기압력이 다공형 GDI 인젝터의 분무 특성에 미치는 영향 모델링
오윤중 ( Yun Jung Oh ),김태훈 ( Tae Hoon Kim ),김대식 ( Dae Sik Kim ),전문수 ( Mun Soo Chen ),박성욱 ( Sung Wook Park ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
The purpose of this study is to investigate the effect of injection pressure and ambient gas pressure on GDI spray characteristics. The CFD (Computational Fluid Dynamics) method is adopted to conduct more quantitative evaluation of spray atomization performance. A multi-dimensional KIVA-3V CFD code was implemented to simulate the two-dimensional spray behavior. KH-RT (Kelvin-Helmholtz, Reyleigh-Taylor) breakup model, evaporation model and droplet collision model were used to consider the real physical phenomena in calculation process. Meanwhile, the predicted results such as spray plume shape, penetration and SMD (Sauter Mean Diameter) results were validate with experimental results to verify the prediction accuracy. It was revealed that spray penetration length is decreased and spray vortex is formed near the nozzle hole as ambient gas pressure increased. The SMD was decreased as injection pressure is increased due to high aerodynamic force. On the whole, predicted results showed good agreement with experimental results.
EMC(Enhanced Momentum Coupling) 기법을 이용한 디젤 엔진 시뮬레이션의 수치 해석격자 의존성 저감에 관한 연구
오윤중(Yun Jung Oh),김사엽(Sayop Kim),이창식(Chang Sik Lee),박성욱(Sung Wook Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper describes the grid-size dependency in diesel engine simulation. Previous studies have shown that traditional CFD codes is sensitive to grid resolution. For this reason, calculated spray results such as spray tip penetration, combustion characteristics are also depend on the grid-size. To reduce these problems, this paper suggests EMC(Enhanced Momentum Coupling) model which enhances the coupling between droplet and gaseous phase. The calculation processes were performed by the KIVA-3V codes and there are two types of computational meshes such as coarse mesh and dense mesh were adopted to verify the grid independency performance on EMC model. In addition, calculated results were compared to experimental results. The calculation results of conventional Eulerian-Langrangian model showed the calculated results highly depend on the grid-size. The main source of this problem was regarded as a result from ineffective momentum coupling between two phases. However, improved EMC model significantly reduced this problem by compensate the insufficient quantity of momentum transfer to the coarse mesh.
가스 제트 모델을 이용한 DME 분무 해석의 격자 의존성 저감
오윤중 ( Yun Jung Oh ),김사엽 ( Sa Yop Kim ),이창식 ( Chang Sik Lee ),박성욱 ( Sung Wook Park ) 한국분무공학회 2010 한국액체미립화학회지 Vol.15 No.4
This paper describes the grid-size dependency of the conventional Eulerian-Lagrangian method to spray characteristics such as spray penetration and SMD in modeling DME sprays. In addition, the reduction of the grid-size dependency of the present Gas-jet model was investigated. The calculations were performed using the KIVA code and the calculated results were compared to those of experimental result. The results showed that the conventional Eulerian-Laglangian model predicts shorter spray penetration for large cell because of inaccurate calculation of momentum exchange between liquid and gas phase. However, it was shown that the gas-jet model reduced grid-size dependency to spray penetration by calculating relative velocity between liquid and ambient gas based on gas jet velocity.
浸透性殺蟲劑의 土壤施用이 배추 진딧물 防除에 미치는 效果
金炅濟,李炳天,吳允重 동국대학교 대학원 1974 大學院硏究論集-東國大學校 大學院 Vol.4 No.-
This experiment was Conducted to study the efficiency of Aphid Control and to increase the yield and quality of chinese cabbage through the prevention of virus disease with permeable insecticides applied to the soil. Four Kinds of insecticide Disyston, Furadan, PSP-204 and Azodrin were applied in setting plants. 1. The number of parasitic aphids per plant of experiment plots treated with insecticides in as follows; A. Disyston … 18.5 B. Furadan … 30.2 C. PSP-204 … 74.2 D. Azodrin … 345.2 E. Control … 368.7 2. The residual efficiency of Disyston Continued for 40 days after application. 3. The rate of virus infection in chinese cabbage was 5.0% in the Disyston treated plot compared to 23.1% in the control plot. The difference was significant among the insecticides. 4. Mean weight per fresh chinese cabbage in the Disyston and Furadan treated polt was heaviest by 2,000g, significantly heavier than the others.