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대칭형 상지 운동기구를 이용한 손목 운동 시 뇌 활성도 패턴
태기식(K. S. Tae),김사엽(S. Y. Kim),송성재(S. J. Song),이소영(S. Y. Lee),박기영(G. Y. Park),손철호(C. H. Sohn),김영호(Y. H. Kim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
We developed a symmetrical upper limb motion trainer for chronic hemiparetic subjects. This trainer enabled the practice of a forearm pronation/supination and wrist flexion/extension. In this study, we have used functional magnetic resonance imaging(fMRI) with the developed symmetrical upper limb motion device, to compare brain activation patterns elicited by flexion/extension wrist movements of control and hemiparetic subject group. In control group, contralateral somatosensory cortex(SMC) and bilateral cerebellum were activated by dominant hand movement(Task 1), while bilateral movements by dominant hand(Task 2) activated the SMC in both cerebral hemispheres and ipsilateral cerebellum. However, in hemiparetic subject group, contralateral supplymentary motor area(SMA) was activated by unaffected hand movement(Task 1), while the activation of bilateral movements by unaffected hand(Task 2) showed only SMA in the undamaged hemisphere. This study, demonstrating the ability to accurately measure activation in both sensory and motor cortex, is currently being extended to patients in clinical applications such as the recovery of motor function after stroke.
소결체의 Nd:YAG 레이저 용접 시 보호가스가 용접강도에 미치는 영향
김용(Y. Kim),양현석(H. S. Yang),박기영(K. Y. Park),이경돈(K. D. Lee) 한국레이저가공학회 2007 한국레이저가공학회 학술대회 논문집 Vol.2007 No.-
This study includes the effects of shielding gas types and flow rate on Nd:YAG Laser weldability of sintered material. The types of shielding gas were evaluated for He, Ar and N₂. Bending strength, porosity rate, hardness and D/W ratio testing of laser weld are carried out to evaluated the quality for fusion area. As a results, Ar gas was showed the best welding strength even the porosity rate is the most value, and increased the flow rate was also improvement the bending strength. Therefore we could know that bending strength is not only affect the porosity rate but also melting degree.