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레이저 열처리로 재결정화된 Poly-Si 박막에서의 이온 도핑과 박막 트랜지스터 제작 연구
장진,이경하,송교준,김재각,임우영 慶熙大學校 레이저 工學硏究所 1995 레이저공학 Vol.6 No.-
We have studied on the effect of ion doping and the application to TFTs(Thin Film Transistors) using poly-Si films recrystallized by XeCl excimer laser with wavelength of 308nm. Sheet resistance was decreased with increasing of an ion acceleration voltage. The sheet resistance of n-type doped poly-Si film at ion dose of ?? and acceleration voltage of 15kV was found to be 1.5㏀/□. The error percentage of sheet resistance when substrate size is 10 ×10㎠ was ±3%. We have fabricated a new low temperature poly-Si TFT with SiNX ion stopper and laser annealed poly-Si. The fabricated poly-Si TFT exhibited a field effect mobility of 72㎠/Vs, threshold voltage of 1V and on/off current ratio of ∼??.
Vagolytic atropine attenuates cerebral vasodilation response during acute orthostatic hypotension
최우종,이기창,김영국,송교준,정성문,황규삼 대한마취통증의학회 2015 Korean Journal of Anesthesiology Vol.68 No.6
Background: Atropine is an anticholinergic drug which is commonly used in clinical practice. The effect of parasympathetic block with atropine on dynamic cerebrovascular regulation remains unclear. This study was aimed to identify effects of vagolytic atropine on cerebrovascular response during acute orthostatic hypotension in humans. Methods: Continuous middle cerebral blood flow velocity (CBFV, transcranial Doppler) and arterial blood pressure (ABP, Finometer) were measured during a sit-to-stand procedure in 10 healthy subjects with placebo and vagolytic (10 μg/kg) doses of atropine. Cerebral vascular tone was assessed by cerebrovascular resistance (CVR = ABP / CBFV). Dynamic cerebral autoregulation was also assessed by transfer function analysis of ABP and CBFV. Results: During the standing session, ABP fell to a similar extent in both groups by an average of 23 to 25 mmHg (26% to 29%). CBFV also fell in all subjects but significantly more in vagolytic atropine (-15.0 ± 7.0 cm/s) compared with placebo (-12.0 ± 5.8 cm/s, P < 0.05). CVR was decreased significantly in the placebo group during posture change (1.56 ± 0.44 vs. 1.38 ± 0.38, P < 0.05), in contrast, lesser decreased in the atropine group (1.60 ± 0.50 vs. 1.53 ± 0.42, P = 0.193). Transfer function coherence in the very-low-frequency range was significantly increased in the atropine group during the standing session (0.55 ± 0.14), compared with the sitting session (0.45 ± 0.14, P = 0.006). Conclusions: These data present that vagolytic atropine attenuates cerebral vasodilation response to acute orthostatic hypotension, suggesting the use of atropine may need care in patients with cerebrovascular disease with vagal impairment.