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鄭殷鎔 梨花女子大學校 韓國生活科學硏究院 1990 韓國生活科學硏究院 論叢 Vol.45 No.-
大學構內에서 發生하는 下水의 汚染內容을 檢討하고 現在의 下水處理方法을 補完 改良할 수 있는 方法들에 對하여 實驗한 結果 調査期間中 發生한 COD의 값과 水素이온농도는 環境保全法上 排出 許容基準以下임을 알았다. 그러나 下水中 重金屬成分의 分離除去方法으로 이온交換樹脂法이 滴用되고 있는데 이것은 施設費 및 運營費가 過重할 뿐 아니라 下水의 汚染度를 생각할 때 이온交換의 效率이 낮고 再生作業에 따르는 二次汚染을 防止하기 困難할 것임으로 重金屬成分의 分離除去法으로 황화나트륨法을 硏究한 結果 Na_2S와 Al_2(SO_4)_3을 같은 농도로 묽게 使用하고 여과할 때 좋은 分離效果를 보였으며 二次汚染도 防止할 수 있음을 알았다. In order to separated heavy metal ions from waste water at Ewha university campus area, the precipitation method by Na_2S solution was carried out instead of the ion exchange resin method. According to the experimental results, adding-equi molar quanties of dilute Na_2S and Al_2(SO_4)_3 aqueous solution to the original waste water and filterating colloidal suspension mixture solution led a good result. Also secondary water pollution was prevented by this method.
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鄭殷鎔 梨花女子大學校 韓國生活科學硏究院 1973 韓國生活科學硏究院 論叢 Vol.11 No.-
Usually, the purification of cellulose nitrate depend upon prewashing process, cutting process and proching process for an industrial operation. This method has not only the long working period but also has the decreasing viscosity. Auther studied about the variation of stability, Viscosity and nitrogen content of cellulose nitrate that is purified from the method of precipitation by diluting with water or dilute alkali aqueous solution after dissolving by the effective solvents. In the results, the variations in viscosity and nitrogen content could not be fined comparative to those of original cellulose nitrate but the stability was good as might have been expected.
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Cavity effect에 依한 jet formation에 關한 理論的 硏究
鄭殷鎔 梨花女子大學校 韓國生活科學硏究院 1975 韓國生活科學硏究院 論叢 Vol.15 No.-
Using the hydrodynamic theory of jet formation for the cavity effect, one can predict a number of characteristics of the jet and it has been experimentally confirmed. However, the hydrodynamic theory of jet formation cannot illustrate sufficiently the shaped charge head model. This investigation has been applied the fnndamental principle of detonation theory in interpreting the results of the studies on the cavity effect. Using this approach the following formula for velocity constituent of jet has been obtaimed. v=√(K.Q cosθ)/p×√(l^2-x^2)/l^2 where θ is the angle of liner base p is the density of high explosive Q is the detonation pressure of explosive l is the length between apex of liner cone and base x is the disatance which detonation wave front has made progress from apex of liner cone. K is the constant value by species of the explosive This epuation conld be illuetrated elongation of the jet which velocity constituent decrease with the time continuosly.
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TNT를 含有치 않는 含水爆樂 製造 및 性能에 관한 硏究
鄭殷鎔 梨花女子大學校 韓國生活科學硏究院 1979 韓國生活科學硏究院 論叢 Vol.24 No.-
1867년 A. Nobel이 특허를 받은 이래 약 100년간 Dynamite는 폭약의 주제품(主製品)으로 많은 수요를 가졌었다. 1950년대에 이르러 산업의 대형화에 따라서 개발되기 시작한 ANFO는 취급이 안전하고 가격이 저렴함으로써 폭약 수요의 대부분을 차지했다. 그러나 ANFO는 저비중(低比重)에 기인하는 몇 가지 단점들이 있으므로 물을 폭약의 한 성분으로 사용하는 함수폭양이 M. Cook에 의해 1958년부터 제조되기 시작하였다. 종래의 폭약은 물을 넣으면 그 성능이 저하하고 특히 질산암모늄을 사용하는 경우 미량(黴量)의 수분을 함유할 때도 32.3℃의 전이점(轉移點)에서 고화(固化)함으로써 질산암모늄을 폭약성분으로 배합할 때는 충분히 건조해야만 되었다. 그러나 함수폭약은 그 성분 중에 10~15%의 수분을 갖는 것이므로 종래의 폭약 개념을 벗어난, Dynamite 이래 가장 획기적인 개혁이라고 생각할 수 있다. 본 연구실험은 이상과 같은 새로운 함수폭약에 대해 개발된 기술을 흡수하고, 국내 사정에 적합한 방향으로 발전시켜 보려는 노력에 의한 것이다. 연구의 방법은 다음과 같이 기획하였다. 1. 함수폭약의 성능을 유지하는 점조제(粘稠劑)의 선택과 적용 방법의 개발. 2. 발화점(發火點)이 낮은 Mg분말의 사용으로 소구경 약포로도 뇌관 기폭(起爆) 가능한 제품의 개발. 3. 물, 산화제, 연료, 점조제 등을 배합하는 방법에 따르는 함수폭약의 성능 구명. 이상의 기본적인 시험을 통하여 몇 가지 유익한 결론을 얻을 수 있었다. Dynamite has been(consumed) as a main product oa industrial explosives for the past 100 years since Alfred B. Nobel received a patent in 1867. Since the 1950's, ANFO has been developed in accordance with the growth of industry and has replaced the majority of explosive because of its simplicity in handling and its low price. However ANFO has several disadvantages due to its low density. Slurry explosives which contain water as a component were first manufactured by prof. M.A.Cook in 1958. In the past, water contained in the explosived caused degradation in quality and those special explosive containing Ammonium nitrate had to be dried sufficiently in order to avoid hardening at the transtion point of 32.3℃. However, the slurry explosive itself is composed of 10-15% water so the concept of explocives has changed drastically. This research project concerns the study of slurry explosives regarding adaptation useful to this country. The study program for this research is as follows: 1. Development of a mrthod for the selection and practical application of a thickernner by which the slurry explosive capacityis to be preserved. 2. Development of capsensitive goods by either using the small dismeter of a cartridge or a low ignition-point Mg power to facilitate the reaction. 3. Determining the characteristics of slurry explosives depending on the mixing sequence of water, oxidizers, fuels, sensitizers, thickenners, cross-linking agents, aerators and stabilizers. The above results were obtained through principal invetigation.
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소아에서 Ketamine 마취 시 Fentanyl과 Midazolam이 각성 흥분에 미치는 영향
정은용 대한마취통증의학회 2008 Anesthesia and pain medicine Vol.3 No.4
Background: Recently, a high incidence of emergence agitation (EA) has been reported in children after sevoflurane or desflurane anesthesia. However, in case of ketamine, there are few up-to-date studies about EA in children. This study observed effects of fentanyl and midazolam on emergence agitation and the recovery profile following ketamine anesthesia for outpatient surgery in preschool children. Methods: Seventy-five children, aged 1−7 years, undergoing brief procedure under intravenous ketamine anesthesia were randomly allocated one of three groups; saline-ketamine, fentanyl-ketamine, midazolam-ketamine. Patients were premedicated with normal saline or fentanyl 0.5μg/kg or midazolam 0.05 mg/kg 5 min before administration of ketamine. Ketamine was given in an initial dose of 1.5 mg/kg and additional dose of 0.5 mg/kg ketamine was given as needed during operative procedure. The incidence of EA and other adverse effects and stay time at recovery room and day surgery center (DSC) were noted. Results: The incidence of emergence agitation was 20 % in control group, 12 % in fentanyl group, and 16 % in midazolam group. Most common adverse effects during recovery was vomiting. There were no significant differences in incidence of emergence agitation, adverse effects and stay time at recovery room and DSC among the three groups. Conclusions: In children undergoing brief outpatient surgery with ketamine anesthesia, emergence agitation was not significantly reduced by addition of fentanyl 0.5μg/kg or midazolam 0.05 mg/kg. No significant differences were observed among the three groups with respect to adverse effects and recovery profile.
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