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전신진동자극훈련을 병행한 PNF 결합패턴 훈련이 뇌졸중환자의 근력, 균형 및 보행에 미치는 효과
최광용,정희연,맹관철,Choi, Kwang-Yong,Jeong, Hee-Yeon,Maeng, Gwan-Cheol 대한고유수용성신경근촉진법학회 2017 PNF and Movement Vol.15 No.2
Purpose: The purpose of this study was to prove the effects of the PNF patterns combined with whole-body vibration (PWBV) training on muscle strength, balance, walking speed, and endurance in stroke patients. Methods: Sixteen subjects were randomly assigned to the PWBV group (n=8) and the whole-body vibration (WBV) group (n=8). The PWBV group performed PNF pattern exercises using sprinter combined with WBV, while the WBV group performed using squatting for 30 minutes. Both groups performed therapeutic interventions five days per week over a period of four weeks. The manual muscle test, timed up and go test (TUG), 10-meter walk test (10MWT), and six-minute walk test (6MWT) were used to assess the muscle strength, balance, and gait of the participants. The SPSS Ver. 19.0 statistical program was used for data processing. Statistical analysis included a pared t-test to compare the pre- and post-intervention, and an independent t-test was used to compare groups. The significance level was set as 0.05. Results: The PWBV group and WBV group showed significant improvements in the TUG, 10MWT, and 6MWT (P<0.05). Significant differences between the PWBV and WBV groups were found (P<0.05). Conclusion: The PWBV improved muscle strength, balance, gait speed, and endurance in stroke patients. Thus, PWBV may be suggested as a therapeutic intervention in patients with stroke hemiplegia.
최광용(Choi Kwang-Yong),오상훈(Oh Sang-Hoon) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
In case of the existing shear wall system, coupling beams tend to be designed strongly. So there are many possibilities that can make damage to specific level and concrete core which has relatively weak stiffness and strength. It causes decline of ductility in structure. This study propose shape of hybrid-coupling beam that applied steel hysteretic damper which has stronger initial stiffness than core system and ability to change strength through design loads. And Using proposed hybrid-coupling beam, it tries to conduct dynamic earthquake response test of core system. And it tries to analysis seismic response characteristics of shear wall system with hybrid-coupling beam using experiment results like acceleration response.
최광용(Kwang Yong Choi),김헌영(Heon Young Kim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Nowadays sheet metal forming simulation is widely used and essential for reducing lead time, saving cost and increasing surface quality in automotive and electrical field. During stamping process the air in die cavity, especially outer panel, can affect surface quality due to locally high compression of air between die and blank sheet. In order to prevent this problem, air vent holes are drilled by technician who has experience and know-how. CAE can be also used for analyzing the air behavior in die cavity during stamping process and needs two aspects. One is sheet modeling with elasto-plastic behavior and the other is air modeling with fluid dynamic behavior. This study is to analyzing sheet metal forming simulation with considering air behavior in die cavity. There can be 3 types of air modeling. One is simple model having linear relationship between bulk modulus and volume change, well-known fluid cell in hydroforming process. The other is ideal gas law model having uniform pressure and temperature in air domain, well-known standard airbag. The third is FPM(Finite point method) having non-constant variables in air domain. These modeling can make direct coupling of mechanical and air fluid behavior in sheet metal forming simulation and the CAE result can give the best idea to technician in analyzing optimized air vent hole’s position, size and number. For this study commercial S/W, PAM-STAMP™ and PAM-SAFE™, is used for direct mechanical and fluid coupling.
최광용(Kwang-Yong Choi) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.3
Electron spin resonance (ESR) is one of an experimental choice for studying magnetic materials that have one or more unpaired electrons. ESR spectroscopy finds its wide applications in branches of science encompassing physics, chemistry, biology, medicine and quantum computation. In this brief review we introduce a basic principle of ESR and describe how to extract information on gfactor, spin and orbital states from the ESR spectral parameters. Finally, several examples are discussed with an intention to have a practical feeling of what ESR can do in magnetism.
고층 전단벽시스템 적용을 위한 직렬 연결형 강재이력댐퍼의 구조성능평가
오상훈,최광용,유홍식,Oh, Sang-Hoon,Choi, Kwang-Yong,Ryu, Hong-Sik 한국강구조학회 2012 韓國鋼構造學會 論文集 Vol.24 No.4
Existing shear wall system may cause ductility fallen to the structure which it is on because relatively weak concrete core would easy to be damaged. In this study, steel hysteresis dampers whose stiffness is higher than existing coupling beam and whose strength is easy to change depending on design load was used in coupling beam. The steel hysteresis damper was proposed for the shape connected in double in series, from this, several static test were conducted to verify structural performance of the damper. FEM analysis was also performed, then design equation were suggested. 기존의 전단벽 시스템은 커플링보를 강하게 설계하는 경우가 많아 상대적으로 내력 및 강성이 낮은 콘크리트 코어와 특정층에 손상이 발생되기 쉬워 건물의 연성이 저하된다. 전단벽 시스템의 연성능력 및 내진성능을 향상시키기 위해 본 연구에서 강성은 기존의 커플링보 이상으로 발휘되면서 설계하중에 따라 내력을 용이하게 변화시킬 수 있는 강재이력댐퍼를 커플링보에 적용하였다. 강재이력댐퍼는 2단으로 직렬 연결된 형상으로 제안하였고, 제안된 강재이력댐퍼의 구조성능을 검증하기 위하여 정적실험을 수행하였다. 또한 FEM 해석결과를 실험결과와 비교 검증하고 강재이력댐퍼의 초기강성, 에너지 흡수능력, 변형능력 등을 분석하여 설계 근사식을 제안하였다.