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배진성(Jin-Seong Bae),김갑수(Kab-Su Kim) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅰ
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PVA-ECC를 활용한 Half PC 복합체의 역학적 특성에 관한 실험적 연구
김재환,김영덕,김갑수,조봉석,장종호,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
ECC represents one particular class of HPFRCC, which are defined by an ultimate strength higher than their first cracking strength and the formation of multiple cracking during the inelastic deformation process. This study is to provide the fundamental data for the development of hybrid construction method such as the half PC(Precast concrete) reinforced by PVA-ECC, the mechanical properties of half PC according to the alteration of properties of PVA-ECC in terms of the type of fiber, Vr, S/M, placing height of PVA-ECC, are experimentally investigated. As the results. it is found that the half PCs of PVA-ECC have very higher mechanical performance in terms of yield load, strain capacity beyond yield point and maximum flexural load than that of mortar. Also, flexural crack in the half PCs of PVA-ECC are not localized at first crack and are growed to many micro crack, especially multiple cracking in specimen of P(12)-30-0.1ㆍ3 occurred.
뇌압하강을 위한 Mannitol 투여가 혈청 및 뇨 전해질에 미치는 영향
김종훈,박광원,김갑수,남용택 대한마취과학회 1992 Korean Journal of Anesthesiology Vol.25 No.3
Osmotic diuretics are used in neurosurgical patient to decrease intracranial pressure. Mannitol produces diuresis because it is filtered by the glomeruli and not reabsorbed from the renal tubule, leading to increased osmolarity of renal tubular fluid and associated excretion of water. There are some controversies about the effect of mannitol induced diuresis on the change of serum electrolytes. But these controversies are related to the mannitol dosage and infusion speed. We studied the effect of mannitol on serum and urine e1ectrolyte change in 10 patients undergoing operation of cerebral tumor or aneurysm. Every patient was free from cardiac and renal disease. We started infusion of 20% mannitol of which dosage is 0.6-0.9gm/kg for 5 to 10 min after cranium was opened and then injected furosemide O.l mg/kg for acceleration of diuresis. We measured serum electrolyte, urine volume and urine electrolyte before and after 30, 60 and 120 min of mannitol infusion. The results were as follows. 1) Seurm sodium and chloride level decreased significantly from 133 and 102 to l30 and 100 mEq/1 respectively after 30 min, but there was no statistic significance after 60 and 120 min of mannitol infusion. 2) Serum potassium level increased slightly from 4.2 to 4.5 mEq/1 after mannitol infusion but there was no statistic significance. 3) Urine volume increased abruptly from 57 to 477 ml/hr as soon as infusion of mannitol but the degree decreased slowly following times. 4) Urine electrolytes concentration increased abruptly as soon as infusion of mannitol but the degree decrease slowly following times. With the above results, we can conclude that intraoperative mannitol and furosemide infusion in healthy patient can cause only transient change in serum electrolyte and the magnitude of change was too small to have significant clinical effect.