비이온성 계면활성제가 함유된 수용액의 특성과 소화성능

이윤우,이윤용,박양원 한국화재소방학회 2002 한국화재소방학회논문지 Vol.16 No.3

환경친화적이면서 저가의 비이온성 계면활성제가 함유된 소화약제를 조제하고 이의 물성과 소화약제 성능시험을 수행하였다. 약제의 주된 계면활성제로서 에톡실레이티이드 솔비톨 셉타올레이트, 에톡실레이트 솔비톨 트리올레이트 그리고 선형 에톡실레이트 이차 알코올을 사용하였다. 본 연구에서는 휘발유의 부피보다 4배 가량의 6% 소화약제가 투입되는 경우 화재를 진압할 수 있는 능력을 가지고 있는 것을 알 수 있었다. 1단위 B급 화재 진화 시험을 수행한 결과, 소화성능은 계면활성제의 농도에 정비례하는 것으로 나타났다. A fire extinguishing agent containing non-ionic surfactant which is environmentally friendly and low cost was prepared and tested its characteristics and fire fighting performance. Ethoxylated sorbitol septaoleate, containing 40 moles of ethylene oxide as the primary surfactant, linear ethoxylated secondary alcohol, containing 7-11 moles ethylene oxide as the secondary surfactant, and ethoxylated sorbitol trioleate, containing 40-50 moles of ethylene oxide were used in the agent. It is demonstrated that the water solution containing 6 wt% agent is capable to extinguish gasoline fire when it is put into the fire four times as much as gasoline. According to the field test of class B fire with a unit 1, it is found that the fire fighting performance is directly proportional to the concentration of surfactant in the agent.

구강병으로 인한 모친과 아동의 활동제한일수에 관한 연구

이윤우,이홍수 대한구강보건학회 1999 大韓口腔保健學會誌 Vol.23 No.3

The purpose of the present study was to prepare basic data on the social oral health status of mother and child by examining patterns of activity restriction due to oral illness for mothers and children and the correlation factor. Research was carried out on 1,907 pairs of mother and child. Research was conducted by means of questionnaires. The total 40 variables were used for the study, 38 independent variables, including the age, the number of family members, education, oral health belief. etc. and 2 dependent variables, the number of activity restriction days. The percentage of mothers and children who experienced activity restriction due to oral illness was calculated. The multiple regression analysis was adopted to examine related factors to the number of activity restriction days far mothers and children. The findings of analysis can be summarized as follows: 1. As to activity restriction due to oral illness, 44.2% of mothers and 66.2% of children experienced. 2. The annual average days of activity restriction for mothers were 4.24, while the average days for children was 3.82. 3. Variables correlated with the number of mothers' activity mestriction days were the number of children, the birth order, employment, susoeptibility out of the oral health belief, valuation on the dentist and the number of visits to dentists for preventing purpose. 4. Variables correlated with the number of child's activity restriction days were mother's employment, mother's concem about a medical fee, mother's frequency of tooth brushing, the number of mothers activity restriction days, susceptibility and seriousness out of the child's oral health belief and the frequency of child's visit to the dental clinic for oral health protection. 5. Susceptibility out of the oral health belief was most highly correlated to the number of activity restriction days for mothers and children.

복강내 투여된 Morphine, Nalbuphine, Ketorolac이 흰쥐 Formalin Test에 미치는 진통효과

이윤우,홍정연,이영숙,남용택 대한마취과학회 1998 Korean Journal of Anesthesiology Vol.35 No.3

Background : The antinociceptive effect and the potency of systemically administered morphine(μ-agonist), nalbuphine(agonist-antagonist), and ketorolac(cyclooxygenase inhibitor) was examined in rats using the formalin test. Methods : Male Sprague-Dawley rats(250∼300 g) received intraperitoneal injection of either saline or 3 doses of each test drug(0.3, 1.0, 3.0 mg/kg of morphine, 0.3, 1.0, 3.0 mg/kg of nalbuphine, and 10, 30, 100 mg/kg of ketorolac) 30 minutes prior to formalin injection. 50 l of 10% formalin was injected into the dorsal surface of the right hindpaw after 1 minute of 4% halothane induction. The construction of the dose-response curves and the determination of doses producing 50% maximum possible effect(ED50) were computed. Results : Intraperitoneal injection of morphine, nalbuphine and ketorolac resulted in the significant, dose-dependent supression of both phases, but nalbuphine has a ceiling effect at high dose for analgesia at the phase I of the formalin test. The rank order of relativpotency in rats to the formalin test was nalbuphine(1.16)>morphine(1)>>ketorolac(0.1) in phase I, morphine(1)>nalbuphine(0.61)>>ketorolac(0.02) in phase IIa, and morphine(1)>nalbuphine(0.57)>>ketorolac(0.03) in phase IIb. Conclusion : Comparing the systemic analgesic potency, nalbuphine and ketorolac will be needed in dosages 1.5 and 50 times that of morphine, respectively. These results suggest that ketorolac is not good enough as a single analgesic drug in preemptive analgesia for major surgery. (Korean J Anesthesiol 1998; 35: 438∼445)

우주용 대구경 광학계 개발

이윤우,양호순,Lee, Yun-U,Yang, Ho-Sun 한국광학회 2012 광학과 기술 Vol.16 No.4

중국은행 산업의 효율성 분석

이윤우,이상만 韓國東北亞經濟學會 2008 동북아경제연구 Vol.20 No.2

Over the last decade, China has reformed its financial system to strengthen the competitiveness of its banking industry. China has carried out wide-ranging financial reform and restructuring since the mid-1990s. The pace of China's globalization seems to have accelerated particularly after its accession to the WTO in 2001. China's joining the WTO has to do with its considerable change of bank management and banking industry. These changes have intensified competition among banks to the extent of inducing liquidations or forced mergers of less competitive banks. In this vein, this paper analyzes the characteristics of China's financial reform and measures and comparatively analyzes the banking efficiency of China in order to examine the outcome of China's bank reform and banking competitiveness and draw up measures for overcoming weaknesses in banking efficiency. This paper uses the stochastic econometric frontier approach (SEFA) to measure banking efficiency. Data were collected from the 2006 financial reports of 15 banks in China. The following shows the outcome of China's bank reforms, evaluated by the efficiency of Chinese banks: First, The average economy of scale of banks in China measured 1.0756 shows that the efficiencies gained from economies of scale are great in China. Second, the average economy of scale among the biggest banks, of which assets are above $100 billion, is 1.0881 for China indicates that Chinese banks may improve productivity through expansion in asset size from the benefits of economies of scale. Third, Chinese banks have the relatively higher average rate of inefficiency at 28.89%. The reason why the technical efficiency of Chinese banks is relatively low stems primarily from NPLs and excessive employment at state-owned banks. Fourth, the technical efficiency examined through the groups of assets scale, shows that the most inefficient group is assets scale of $30 billion ∼ $50 billion for China. On the other hand, the most efficient groups are small banks, of which assets are less than $30 billion, for China (21.19%). In order for the most inefficient banks in China in the future, therefore, it is seemingly necessary for them either to be developed into a niche market, which is specialized in a certain area and service, by slimming down its scale.

데이콤 오라이온 공동위성 발사 및 서비스

이윤우,Lee, Yun-U 한국위성정보통신학회 1999 위성통신과 우주산업 Vol.7 No.2

불화 γ- Al2O3 상에서 아세틸렌으로부터 1,1- difluoroethane 의 합성

이윤우,임종성,김재덕,이윤용 ( Youn Woo Lee,Jong Sung Lim,Jae Duck Kim,Youn Yong Lee ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.1

갈색세포종 마취시 Nitroglycerin 정주례 보고

이윤우,오흥근,남순호,방서욱 대한마취과학회 1983 Korean Journal of Anesthesiology Vol.16 No.3

A 41 year-old male underwent resection of a pheochromocytoma under general anesthesia. The patient was treated with phenoxybenzamine for 14 days preoperatively and premedicated with triflupromazine, diazepam, pethidine and hydroxyzine in combination. Following induction of anesthesia with intravenous morphine, thiopental sodium and alcuronium, endotracheal intubation was performed. As soon as intubation, tachycardia(143/min) and hypertension(170/100 mmHg) developed, but were controlled by intravenous injection of propranolol. Anesthesia was maintained with nitrous oxide, oxygen and enflurane, and alcuronium. Blood pressure during manupulation of tumor mass was 160/100 mmHg without arrhythmia but gradually was controlled to the range of 120-130/80-85 mmHg after intravenous infuaion of nitroglycerine at the rate of 0.5-2 μg/kg/min. After removal of the tumor mass, the blood pressure dropped to 100/70 mmHg. Blood pressure was controlled by I.V. low molecular weight dextran, and Hartmanns solution, but a vasocontrictive agent was not needed. There was no marked tachycardia or arrhythmia during anesthesia. The importance of preoperative preparation, premedication, selection of anesthetics and nitroglycerne for controling the episodic hemodynamic pressure response is discussed.

풍력타워 구조물의 감쇠비에 따른 진동저감 효과 분석

이윤우,김승준,강영종,한상윤 한국복합신소재구조학회 2017 복합신소재구조학회 학술발표회 Vol.2017 No.04

Wind tower structure has relatively simple shape compared to other structures, but due to its characteristics, various and irregular environmental loads are applied. These loads cause vibrations at tower, and can cause failure of the structure if over vibration occurs. Vibration occurred at structures is gradually exhausted by damping of the structures, and if high damping is ensured, the failure of the structure due to over vibration can be prevented. In this study, the vibration reduction effects are to be analyzed through FEM analysis by examining the top displacement, bottom moment, and bottom fatigue damage of the structure depending on damping ratio of the wind tower structure.

염증성 근질환

李潤雨 대한의학협회 1994 대한의학협회지 Vol.37 No.5