당뇨병유발백서에서 급성패혈증 병발시 적혈구막지질과산화의 변화

박성우,홍성관,유형준,장대영,강승식,유재명,임성희,최문기,노정우,이규만 대한당뇨병학회 1994 Diabetes and Metabolism Journal Vol.18 No.3

R . F . magnetron sputtering 법으로 제작한 ITO 박막의 특성

정운조,박계춘,유용택 한국센서학회 1995 센서학회지 Vol.4 No.2

Indium Tin Oxide (ITO) thin films have been fabricated by the rf magnetron sputtering technique with a target of a mixture In₂O₃ (90mol%) and SnO₂ (10mol%). We prepared ITO thin films with substrate temperature 100, 300, 400, 500℃ and post-annealing temperature 300, 400, 500℃. And w e analyzed X-ray diffraction patterns, electrical properties, transmission spectra and SEM photographs. As a result, the crystallinity, electrical conductivity and transmittance of ITO thin films were improved with increasing substrate temperature. I3ut, as increasing post-annealing temperature in air. conductivity of the film was decreased. When the ITO thin film was fabricated with substrate temperature of 500℃ and thickness of 3,000 Å, its resistivity and transmittance were about 2×10^(-4)Ωcm and 55% or more, respectively.

무가압 침투법에 의해 제조된 Al/BN 복합재료의 미세조직과 인장성질

조수연,이건배,심호섭,허성우,유황룡,권훈 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.12

Spontaneous infiltration and strengthening behaviors were analyzed in terms of microstructures and tensile properties of Al/BN composite fabricated by pressureless infiltration technique, compared with control alloy without BN fabricated by the same method. The Mg₃N₂ formed by the reaction of Mg vapor and nitrogen gas, which coated the particles in the powder bed, is believed to induce spontaneous infiltration through a great enhancement of wetting via the following reaction, Mg₃N₂+ 2Al→2AlN + 3Mg. This was identified by the finding of AlN particle layers on the surfaces of old Al particles in the powder bed, which contacted with the infiltrating melt. In addition, unreacted Mg₃N₂ was observed outside the composite, where the Al melt directly did not come into contact. Fine AlN particles formed in-situ resulted in a significant strengthening even in the control alloy with no addition of BN. In the composite reinforced with BN, additional AlN was formed by the interfacial reaction of the BN and Al melt as well as AlN by the in-situ reaction. Consequently, both the BN particles and the additional AlN particles formed by the interfacial reaction led to a further strengthening in the composite, as compared to control alloy strengthened by the AlN particles formed in-situ.

보행마취(步行麻醉)

김영석,김완식,황호성,이진근,유희구,김흥대 대한마취과학회 1977 Korean Journal of Anesthesiology Vol.10 No.2

An imaginative innovation to shorten hospital stays as a means to reduce patient charges, is out-patient surgery. This procedure also minimized the inconvenience and disruption of the family unit, reduced the opportunities for cross-infection, and freed hospifal beds for the more serriously ill patienta Since the concept of out-patient surgical service was organized, managed, and performed in the Hanyang Medieal Center, we had experience of 132 ambulatory anesthetics during the last two years (from Jan. 1974. to Dec. 1975 ). The results are summarized as follower 1. Preanesthetic examination should be routinely cheeked with Hb., Hct., urinalysis and chest x-ray. 2. Premedication should be administered preanesthetically, atropine sulfate intravenously. 3. ASA class 1 patients should be rhnsen fnr short (less than 1 hour) procedures. 4. Anesthesia is induced with Epontol+S.C.C. and maintained with Halothane+N2O+O2. 5. We suggest that ambulatory anesthesia should be more carefully planned, organized, and managed.

Ti(4) 및 Fe(3) 이온을 함유한 황산 수용액중에서 D2EHPA 에 의한 용매추출에 관한 연구

신영훈,유영홍,이철태,김재용,유정근 고려대학교 공학기술연구소 1991 고려대학교 생산기술연구소 생기연논문집 Vol.27 No.1

This study was carried out to find fundamental conditions for effective solvent extraction of Ti and Fe components from leaching solution of reaction product of (NH₄)₂SO₄ and titaniferous magnetite ore. In experiment of solvent extraction of Ti and Fe components, new aqueous phase which contains only Ti(IV), Fe(III) was used instead of leaching solution of sulfation product. The extraction of Ti(IV) and Fe(III) components from aqueous phase with D₂EHPA (Di-2-ethyl hexyl phosphoric acid)-kerosine system was carried out as function of concentration of extractant in the organic phase, pH of agueous phase and shaking time. The maximum value of separation factor(β) was 102.6 at 0.05 M D₂EHPA, aqueous phase pH 1.0, and 30 min was sufficient for the condition of shaking time. In stripping of Ti and Fe components from organic phase; the higher temperature and more concentration of H₂SO₄ increased the stripping percent of Ti and Fe components and the stripping percent of Fe was always higher than that of Ti. In separation process of Ti and Fe components, when 2 step stripping process was used, 93.7%, 99.5% Ti and Fe components was obtained respectively. While, 3 stage continuous countercurrent process was used, 96.3%, 84.7% of Ti and Fe components was obtained respectively.

염화암모늄에 의한 ilmenite 의 염소화반응

유영홍,이철태,박용성,김재용 고려대학교 공학기술연구소 1985 고려대학교 생산기술연구소 생기연논문집 Vol.21 No.1

The reactions between raw ilmenite and NH₄Cl, and between alkali(NaOH) fritted ilmenite and NH₄Cl, were experimentally investigated in order to find the possibility of NH₄Cl, being an alternative chlorine source. By comparing the experimental results, NH₄Cl, was a good alternative chlorine source for the chlorination of alkali frilled ilmenite. The optimum conditions for alkali fritting were caustic ratio: 1.0, fritting temp.: 800℃, holding time : Ih and for the chlorination of alkali frilled ilmenite were reaction temp. : 325℃, weignt ratio of NH₄Cl, to ilmenite: 5.0, reaction time : Ih, N₂ gas flow rate : 30 ㎤/min. Under above mentioned conditions, the conversion of iron in ilmenite to iron chloride was 88.9% and the content of TiO₂ increased from 55.5% to 88.3%.

황산암모늄에 의한 철산화물의 황산화반응

유영홍,이철태,박용성,홍상의 고려대학교 공학기술연구소 1986 고려대학교 생산기술연구소 생기연논문집 Vol.22 No.1

The reactions between iron oxides, such as α-hematite, magnetite and wuestite with ammonium sulfate were investigated in order to find the possibility of (NH₄)₂SO₄ being a sulfating agent and a new selective separation process of Fe component from natural ore. In these reactions, iron oxides were converted to (NH₄)₃Fe(SO₄)₃ or(NH₄)Fe(SO₄)₂ under various experimental conditions. In proportion to the increase of (NH₄)₂SO₄ mole ratio to iron oxide, the conversion ratio were increased. With an increased reaction temperature, the reaction rate and conversion ratio were increased. Under N₂ gas flow rate = 30㎤/min, reaction time = 3h, the optimum reaction temperature was 350℃ for all iron oxides, and the optimum (NH₄)₂SO₄ mole ratio to the iron oxide were 10.0 for α-Fe₂O₃, 21.0 for Fe₃O₄ and 5.0 for FeO, respectively. Under above mentioned conditions, the conversion of iron oxide to ammonium iron sulfate were 97.31% for α-Fe₂O₃3, 94.33% for Fe₃O₄ and 95.41% for FeO, respectively.

전신 마취중 발생한 부적합수혈 증예 보고

김완식,박동호,황호성,유희구 대한마취과학회 1976 Korean Journal of Anesthesiology Vol.9 No.1

We have experienced a case of incompatible blood transfusion during general anesthesia in which 300ml of improperly typed blood were tranfused. Upon discovery of the error, the tranfusion was discontinued and the patient was immediately, carefuliy and aggressively treated with proper fresh blood, plasma expander(Rheomacrdex-D), fluids(Hartmanns solutipn and 10% dextrose in water) and drugs (Solu-Cortef 300 mg, furosemide 400 mg, 20% manitol 500 ml, digoxine 0. 5 mg, morphine 15 mg). The free hemoglobin in the plasma and urine and blood gas of the femoral or radial artery were rnonitorecl throughout the resuscitative procedure. It is felt that accidental incompatible blood transfusion of more than 300 ml should be preventable and that the patients life may be saved without serious complications with imme-diate and proper management.

“Loosco” 사용 증례 보고

김완식,박동호,황호성,이진근,유희구 대한마취과학회 1977 Korean Journal of Anesthesiology Vol.10 No.2

In the 1st two years (Frcm April 1975 to March 1977), we have had experience with 15 surgical infant patients undergoing general inhalation anesthesia with the $quot;Loasco$quot; Infant Ventilator. The Locsco$quot; Infant Ventilator is designed for the ventilation of neonates and infants on the lines of an open sysern with a gas mixture of air-oxygqn or oxygen-anesthetics. However we used it with a gas mixture of halothane-N2O-oxygen, This study was undertaken to evaluate the value of ventilatory support with the Loosco$quot; lnfant Ventilator auring general inpa!ation anesthesia for 15 surgical patients ivhose age was less than 2 years of age. The blood gas analysis showed slight underventilation cnmbined with metabolic acidosis during the first 15 minutes, in which respiratory frequency was set at 30 times per minute, but the ventilation was gradually improved by inciease in respirataey frequency to 35 times per minute during tlie lost 20 ninute. In this study, ive corsiderec. the irnportant tactors ivhich inftuenced the value of the blood gas analysis. Not only caveful anesthetic niaoagement to keep the airway and to corvect cardiovascuiar clerangeineht, but also frequent and repeated blood gas analysis and its aeeurate interpretation were stressed for using the $quot;Loosco Infant Uentilator during pediatric general anesthesia.

후판 표면 산화층 색상에 미치는 산화층의 표면 현상 및 상분율의 영향

박신화,유경종,이중주,홍순태,손병준 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.10

It was known that the color of Hematite(Fe₂O₃) is red, while Magnetite(Fe₃O₄) is dark blue. To clarify the origin of red color on the steel plate, the relationship between the volume fraction of oxide phases and the color of steel plate was investigated in this study. The volume fraction of Wu¨stite, Magnetite, and Hematite was quantitatively evaluated by a direct comparison X-ray method using crystal structure informations. Furthermore, the effect of volume fraction and the manufacturing process on the surface color of steel plate was investigated. It was found that FRT(final rolling temperature) played an important role on the plate color.