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박영철,장성호,신정순 고려대학교 의과대학 1989 고려대 의대 잡지 Vol.26 No.3
This study was devised in order to observe the effects ov various concentration of hypertonic saline solution on the acute of hemorrhage in cats. Cats, selected as experimental animal for this study, were divided into four groups, each consisting of seven animals. Hemodynamic response and effect on intracranial pressure were evaluated after creating 100ml of blood loss and then instituting replacement with solution of 0.9% isotonic saline, 2.5% hypertonic saline. 5.0% hypertonic saline, 10.0% hypertonic saline. The results obtained are as follows: 1. Compared to isotonic saline, hypertonic saline was more effective in restoring the hemodynamic disturbance and reducing the increase in intracranial preaaure caused by hemorrhage. 2. The effect of 5.0% hypertonic saline was found to be superior to the other concentrations of hypertonic saline. 3. Arterial blood pH revealed alkalemia present after acute blood loss, followed by acidemia after treatment. 4. Arterial blood CO₂ and end tidal CO₂ corresponded to blood pH levels. 5. Plasma sodium concentration increased as concentration of saline solution was increased. In view of the results, it may be feasible to say that the hypertonic saline may be effective in restoring cardiovascular disturbances and in reducing increased pressure during the acute phase of hemorrhage in cats, 5.0% hypertonic saline was preferable to 10.0% hypertonic saline in this study groups.
맹꽁이 (Callula tornieri) 幼生의 體色變化에 미치는 明暗의 影響
朴永喆 공주대학교 사범대학 과학교육연구소 1978 과학교육연구 Vol.10 No.1
A tail-darkening reaction is described for larvae of the Microhyla frog. Callula tornieri Tails are black in the light because melanophores in the dermal layer(dermis) of the fin be come dendritic. In darkness the melamphores are punctate and the tail appears black. This photosensitivity is local since tail-darkening in isolated tail and in intact tadpoles occurs equally well. Correlations between tail-darkening and morpholagical and behaviral (feeding activities charecteristics are discussed from comparisons with Agalychinus larvae.
박영철 대한전자공학회 2007 電子工學會論文誌-TC (Telecommunications) Vol.44 No.10
A new adaptive alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method is proposed to obtain isotropic wave propagation for all directional angles. We add the square terms of time-step multiplied by the spatial derivatives of x and y as a perturbed term to the conventional ADI-FDTD and can find the optimization coefficient of square terms of time-step to generate the minimum anisotropy. The new ADI-FDTD is also stable, even when its time-step is greater than the Courant-Friedrich-Levy (CFL) limit. The characteristic equation of the dispersion relation governing the new method is derived and compared with the theoretical and numerical results for the conventional ADI-FDTD and perturbed ADI-FDTD methods. 공간상의 전자파 전파에서 모든 각도에서 동일한 전송속도를 갖는 ADI-FDTD 해석방법을 제안한다. 이는 기존의 ADI-FDTD 방법에서 시간 간격의 2차항에 x, y 에 공간 미분이 곱해진 항을 추가하고, 이에 대한 최적의 상수를 구하여 구현하였다. 새로운 ADI-FDTD 는 CFL 안정도 조건을 초과하는 시간 간격에 대해서도 안정적인 특성을 나타낸다. 이 방법에 대한 분산 관계식을 구한 후 이를 수치적인 결과와 비교하여 제안하는 방법이 기존의 방법에 비해서 나타나는 장점, 즉 등방성 전파 및 수치적 오차의 감소를 수치적 예를 통하여 검증하였다.