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Application of ionic liquids for metal dissolution and extraction
김병권,이의주,강예지,이재준 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-
This review summarizes the results of studies on the selective dissolution and extraction of Fe, Cr, Cu, and Zn by ionic liquids, as an alternative to the use of conventional molten salts or pickling agents, for various types of steel. Ionic liquids are classified according to the metals, metal ions, and metal oxides by which they can be extracted or dissolved. The results of the metal extraction efficiency per unit time presented in the literature are summarized in a simple unified graphic format. This provides a comparative understanding of the most efficient ionic liquid for the extraction of specific metals.
Protamine sulfate 가 심혈관계에 미치는 영향
김병권,박진웅,구본업,김태환 대한마취과학회 1985 Korean Journal of Anesthesiology Vol.18 No.4
Systemic bypotension is commonly observed in association with the administration of protamine after cardiopulmonary bypass. To elucidate the circulatory changes and arterial blood gas changes of protamine sulfate administration, we studied 27 patients following cardiopulmonary bypass. In the intraaortic protamine administration group(N=5), the mean arterial pressure decreased significantly (P<0.05) in 5 minutes during protamine infusion and after protamine infusion respectively. Heart rate, central venous pressure and blood gas andalysis did not change significantly. In intravenous protamine administration group(N=22), the arterial oxygen tension increased significantly (p<0.05 & p<0.01) in 10 minutes during protamine infusion and after protamine infusion respectively. There were no special changes when the more than 0.3mg/kg/min rate of protamine was injected byt the mean arterial pressure decreased significantly(p<0.05) in 5 minutes during the protamine infusion. Mean arterial pressure, heart rate, central venous pressure and blood gas analysis did not change in the less than 0.3 mg/kg/min rate of protamine was injected. There were no circulatory changes in the less than one hour CPB time group but the arterial oxygen tension increased significantly in 5 min utes and 10 minutes during the protamine infusion and after protamine infusion. But in the more than one hour CBP time group, the mean arterial pressure decreased significantly in 10 minutes during the protamine infusion and after protamine infusion.
김병권,백운이,박진웅,김시오,홍정길 대한마취과학회 1988 Korean Journal of Anesthesiology Vol.21 No.1
Spinal anesthesia employing 0.5% plain bupivacaine was administered to 40 patients scheduled for lower limb or perineum surgery at kyungpook National University Hospital. Two different volumes(3 and 4 ml) and 2 different injection sites (lumbar interspaces L2/3 and L3/4) were used and their effects were compared. The patients were divided into four groups of 10; group A received 3 ml of bupivacaine at L3/4, group B 3ml at L2/3, group C 4 ml at L3/4 and group D 4 ml at L2/3. The results were as follows. No significant differenct were found between the 4 groups of patients in relation to age, height, weight and length of surgery. The time for maximal sensory spread was 18.0±7.15 and 18.5±7.84 minutes in groups B, and C(p<0.05) and 20.0±7.84 minutes in group D(p<0.01) which showed a significant increase compared with 11.0±5.6 minutes in group A. Singificant differences(p<0.05) in maximal sensory spread levels were observed between groups A, B(T_9) and group C, D(T_7) No significant differences were found among the four groups in relation to the time of maximal motor blockade. Complete motor block was observed in all groups 20 minutes after spinal injection. Changes in blood pressure and pulse rate showed a significant(p<0.05) decrease in 10∼15 minutes, and a very significant(p<0.01) decrease 20∼30 minutes after spinal injection. Four patients experienced hypotension or bradycardia and two patients developed nausea or vomiting, but none of the patients developed a postspinal headache or micturition difficulty.