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김완식,박동호,황영희,김흥대,안기량,석민호,김지영,장경덕,서병태 대한마취과학회 1982 Korean Journal of Anesthesiology Vol.15 No.1
Midazolam maleate, a water soluble banzodiazepine unlike diazepam, was synthetized by Walser and Fryer in 1975. In order to ealuate the effectiveness as an induction agent for general anesthesia, 22 elective surgical patients belonging to ASA classification 1 and 2 were selected. And ten patients (male 7, female 3, average 33.5 years old) were induced with midazolam maleate 0.2mg/kg and twelve patients (mdale 7, female 5, average 32.5 years old) with diazepam 0.3mg/kg. The results were summarized as follows. 1) Anesthesia was induced in all of midazolam group by one intravenous injection, but only 6 patients of diazepam group could induced by one injection and the other 6 patients needed 2 or more injections. 2) The changes of blood pressure and pulse rate after induction and intubation were almost similar in the two groups, but greater individual variation was seen in diazepam group. 3) A buring sensation following intravenous injection was noted in 11 cases of diazepam group, but none in midazolam group and no phlebitis in either group. From the above results, diazepam and midazolam are almost similar in nature but midazolam is definitely effective as an induction agent and has less side effects. Therefore midazolam maleate is regarded as a more effective agent than diazepam as an induction for general anesthesia.
Cu-Al-Ni-Ti-Mn 합금의 변태특성 및 기계적 성질에 미치는 가공열처리의 영향
강조원,장우양,양권승,이영수,곽사호,김춘동,백승남 한국열처리공학회 1999 熱處理工學會誌 Vol.12 No.2
The distribution of the second phase, the change of transformation temperature and mechanical properties with thermomechanical treatment conditions were investigated by metallography, calorimetry, EDS, tensile test and fractography in a Cu-Al-Ni-Ti-Mn alloy. The cast structure revealed Ti-rich precipitates(X_L phase) between dendrite arms, which have been identified as (Cu,Ni)₂TiAl intermetallic compounds. By homogenizing above 900℃, the X_L phase was melted in the matrix, while the X_s phase was precipitated in matrix and the volume fraction of it was increased. When hot-rolled specimen was betatized below 750℃, recrystallization could not be observed. However, the specimen betatized above 800℃ was recrystallized and the grain size was about 50㎛, while X_s phase was precipitated in matrix. With raising betatizing temperature, M_s and A_s temperatures were fallen and transformation hysteresis became larger. The strain of the specimen betatized at 800℃ was 8.2% as maximum value. The maximum shape recovery rate could be obtained in the specimen betatized at 800℃ but it was decreased due to the presence of X_s phase with increasing betatizing temperature.
흉막염환자에 있어서 흉막액 Adenosine Deaminase 활성도의 임상적 의의
이장훈,김성규,안철민,장상호,손희영,김기호 대한내과학회 1986 대한내과학회지 Vol.31 No.6
A clinical observasion was done on 145 cases of the various pleural effusions admitted to Yonsei University Hospital from Mar. 1984 to Mar. 1986, The pleural effusions were due to tuberculosis(76 cases), suspected tuberculosis(18 cases), malignancy(16 cases), suspected malignancy(22 cases), empyema or pneumonia(10 cases), miscellaneous (3 cases). We have measured the ADA activity of pleural fluids in each cases and the results were as follows. 1) In the tuberculous pleural effusion, the ADA activity of pleural fluid was significantly higher than that in the malignant pleural effusion. 2) There was no difference between the activities of pleural fluid ADA in the tuberculous pleural effusion and that in the suspected tuberculous pleural effusion. 3) If the cut-off value of pleural fluid ADA activity is 40U/L, the sensitivity was 90.4% and the specificity was 86.3% in the dignosis the tuberculous pleural effusion. It is suggested that the measurement of ADA activity in pleural effusion is of value in the differential diagnosis of patients with tuberculous pleurisy from those with malignant pleurisy and others, particularly when the results of other laboratory and clinical tests are negative, if the value is over 40 U/L.
김용철,길찬일,신정순,장진경,임혜자,우설희 대한마취과학회 1983 Korean Journal of Anesthesiology Vol.16 No.3
Myasthenia Gravis is a chronic disease of disputed etiology, possibly an auto-immune reaction to the moter end-plate, characterized by exacerbations and remissions, a rare disease entity in Korea. Myasthenia Gravis has offered many anesthetic problems because it affects respiratory muscles occasionally and bronchial secretion from preoperative anticholinesterase therapy. The chief concern is to ensure adequate respiration both during and after operation. During the year 1976-1982, we have experienced the anesthetic management of 8 patients with myasthenia gravis and thymectomy. From our experiences, we conclude that respiratory care and disuse of relaxants is the key to successful management.
스퍼터링법으로 제작된 TiO2 박막의 광촉매 특성에 관한 연구
최진호,이원재,김장규,신동훈,장광필,남궁규철 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.9
TiO₂ films deposited on glass were prepared by plasma sputtering method. The dependence of structural properties on the deposition conditions and the photocatalytic degradation of methylene blue were investigated. When the oxygen partial pressure was higher than 5%, as-deposited TiO₂ films exhibited an almost amorphous structure under DC plasma condition. A transition at which metallic mode deposition(Ti) changed to dielectric mode deposition(TiO₂), was observed at the 5∼10% oxygen partial pressure under RF plasma condition. The amorphous structure changed to anatase structure by heat treatment at 400℃ for 4 hours. Crystallized anatase structure had a preferred orientation along 〔101〕 direction. For 150 min of photocatalytic degradation, the concentration of methylene blue was reduced by half.
김영석,김완식,황영희,김흥대,김교상,장경덕 대한마취과학회 1981 Korean Journal of Anesthesiology Vol.14 No.1
The segmental spread of epidural analgesia was measured in seventeen surgical patients aged between 17 and 52 years, and in fourteen patients between 60 and 77 years. The upper level in the young was 6.29(±1.56) thoracic vertebra level, but in the elderly was 4(±0.65) thoracic vertebra level at 20 minutes after epidural injection of 1.5% lidocaine 20㎖. A given volume of solution spreads to 0.9, 1.07, 1.54, 2.29 segments greater upper extent at 5, 10, 15, 20 minutes after epidural injection and 0.57, 1.07 segments greater lower extent at 5, 10 minutes in the elder than young. So with increasing age relatively small amounts of solution are required, to produce the same extent of anesthesia in the yonung.
Ti-6Al-4V 합금의 가공 열처리조건에 따른 기계적 특성의 변화 (1) : 인장및 파괴거동 Tensile and Fracture Behaviors
최승주,김상식,조용성,장우길,서성문 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.12
Tensile and fracture behaviors of double-forged and aged Ti-6Al-4V alloys, with and without solution heat treatment and/or rapid cooling, were examined in the present study. Depending on the forging temperature and heat treatment condition, the microstructures of Ti-6Al-4V alloys varied greatly, including equiaxed α+transformed β. elongated α+equiaxed α, α' or acicular α in the prior β grain, and significantly affected the tensile and fracture properties at 25 and 316℃. Tensile and fracture failure modes of Ti-6Al-4V alloys with different microstructures were discussed based on the detailed fractographic examinations.
중소규모 건설현장의 안전수준을 고려한 안전관리 프로그램의 개발
이재용,고성석,안홍섭,장명훈,최순주 한국산업안전학회 1999 한국안전학회지 Vol.14 No.2
In these days, large construction companies computerize safety management function and use softwares but small and medium ones do not have any or little in Korea, although it is much more necessary for the latter having high accident ratios than for the former to make efforts to develop computerized safety management tools. That is, a reason why no safety management program has been developed and construction accident are required to be reduced outstandingly, computerized safety management systems are much needed to be developed. Thus, safety management software named SAFETY PLUS has been developed in this research that has 4 management scopes classified by the size of construction project. The utilization of SAFETY PLUS will be able to increase both effectiveness and efficiency of safety management efforts and result in drastic decrease of construction accidents.