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김호영(Hoyoung Kim),박찬범(Chanbum Park),방수용(Sooyong Bang),장호영(Hoyoung Jang),김용주(Yongju Kim),이석민(Sukmin Lee) 물리치료재활과학회 2021 Physical therapy rehabilitation science Vol.10 No.2
Objective: Single leg bridge exercise (SLBE) improves trunk muscle activation and provides muscle stability by aligning jointsrelated to posture. This preliminary study aimed to investigate the effects of SLBE on abdominal muscle activation in subacutestroke patients. Design: Cross-sectional study. Methods: Fifteen subacute stroke patients (9 males, 6 females) voluntarily participated in this study. SLBE was performed on theaffected side. Each individual patient performed an SLBE ten times in three sets and was asked to hold their position for 5 s. Muscles activity was recorded using a surface electromyography (EMG) system before and after the SLBE. A surface EMGsystem was used to analyze the muscle activity during general bridge exercise, including the rectus abdominis (RA), internaloblique (IO), and external oblique (EO) abdominal muscles. Results: Muscle activity of both EO and IO on the affected side significantly increased (p<0.05), whereas the muscle activity ofthe RA and the three muscles on the unaffected side did not show a significant difference. In addition, improvement in muscleasymmetry of the EO and IO showed a significant change after SLBE (p<0.05). Conclusions: SLBE is effective in activating the abdominal muscles of stroke patients on the affected side and is a helpfulexercise intervention that activates the muscles to transform asymmetric abdominal muscles into symmetric patterns.
SPH 기반의 가상 입자와 반발 벽을 이용한 향상된 경계 처리 방식도입과 해석 적용
이지형(Ji-Hyeong Lee),조인혁(Inhyeok Cho),장호영(Hoyoung Jang),이종수(Jongsu Lee),조광준(Kwangjoon Cho) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
SPH(Smoothed Particle Hydrodynamics) is based on Lagrangian method and one of the meshless techniques that analyzes the fluid flow. Various research have been conducted on boundary conditions in the SPH method. Integral type boundary conditions is relatively simple method and have been used rather than other method. Boundary particle method also used to get more precise result in various research. In this work, improved integral type boundary condition introduced which is using fictious particle with repulsive wall and application in static and dynamic simulation. Hydrostatic and tank sloshing simulation was performed using to prove this method is stable. It was confirmed that the fluid particle does not penetrate wall boundary and result was physically acceptable.