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성인에서 전정안구반사를 이용한 평형감각과 자율신경반응의 관련성
김규겸 ( Gyu Kyum Kim ),박현영 ( Hyun Young Park ),전희정 ( Hee Jeung Jun ),윤상대 ( Sang Dae Yun ),박병림 ( Byung Rim Park ) 한국감성과학회 1999 춘계학술대회 Vol.1999 No.-
The nature of the interactions between the vestibular and autonomic systems is complex and has not been fully defined. Vestibuloocular reflex induced by sinusoidal rotation and activity of the autonomic nerves in the heart were measured to investigate the interactions between the vestibular system and the autonomic nervous system in healthy adults. Eye movement induced by sinusoidal rotation of the whole body or optokinetic stimulation at 0.04 Hz was analyzed in gain, phase, and symmetry. EKG was measured during vestibular stimulation and analyzed in heart rate variability including mean R-R interval, standard deviation (SD) and coefficient of variance (CV) of R-R interval, and power spectrum of low frequency region (LF) and high frequency region (HF). Gain of eye movement was 0.65±0.03 by rotatory stimulation, 0.70±0.02 in optokinetic stimulation, 0.08±0.02 in visual suppression, and 0.84±0.04 in visual enhancement. In R-R interval, resting condition (control) was 0.82±0.03 sec, and visual suppression showed significant increase and visual enhancement did significant decrease compared with control (p<0.01).CV was 0.06±0.02 in control and visual enhancement increased significantly (p<0.05). In LF/HF control was 1.40±0.23, which was not different from rotatory or optokinetic stimulation. But visual suppression decreased LF/HF significantly and visual enhancement increased significantly compared with control (p<0.01). These results suggest that degree of gain corresponds with LF/HF and increased gain in visual enhancement is deeply related to the activity of sympathetic nerves.
이경호 ( Kyung Ho Lee ),한정호 ( Jeongho Han ),김경수 ( Gyeong Su Kim ),윤상대 ( Sang Dae Yun ),이영국 ( Young Kook Lee ) 한국열처리공학회 2015 熱處理工學會誌 Vol.28 No.6
The aim of the present study was to predict the variations in microstructure and deformation occurring during gas carburizing and quenching processes of a SCM420H planetary gear in a real production environment using the finite element method (FEM). The motivation for the present study came from the fact that previous FEM simulations have a limitation of the application to the real heat treatment process because they were performed with material properties provided by commercial programs and heat transfer coefficients (HTC) measured from laboratory conditions. Therefore, for the present simulation, many experimentally measured material properties were employed; phase transformation kinetics, thermal expansion coefficients, heat capacity, heat conductivity and HTC. Particularly, the HTCs were obtained by converting the cooling curves measured with a STS304 gear without phase transformations using an oil bath with an agitator in a real heat treatment factory. The FEM simulation was successfully conducted using the aforementioned material properties and HTC, and then the predicted results were well verified with experimental data, such as the cooling rate, microstructure, hardness profile and distortion.