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리튬 이온 이차전지 Cathode용 Li(Mn$_{1-}$$\delta$Nb$\delta$)$_2$O$_4$의 전기적 특성
오용주,유광수 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.9
As a basic study for cathode materials of {{{{ { {LiMn }_{2 }O }_{4 } }}-based lithium-ion secondary batteries Li({{{{ { { { {Mn }_{1-$\delta$ }Nb }_{$\delta$} )}_{2 }O }_{4 } }} ($\delta$=0.05, 0.1, 0.2) materials which Nb is substituted for Mn were synthesized by the solid state reaction at 80$0^{\circ}C$ and 110$0^{\circ}C$ respectively. The second phase {{{{ { LiNbO}_{3 } }} appeared above $\delta$=0.1 As the result of im-pedance analysis as the amount of substituted Nb increased the resistivity of grain boundary increased greatly. Compared to undoped-{{{{ { {LiMn }_{2 }O }_{4 } }} the electrical conductivity of Li({{{{ { { { {Mn }_{1-$\delta$ }Nb }_{$\delta$} )}_{2 }O }_{4 } }} decreased slightly but is charging capacity and potential plateau increased.
5.7-diiodo-8-hydroxyquinoline-XAD침윤수지의 금속이온흡착 및 분리에 관한 연구
이택혁,손병찬,오용주 培材大學校 1985 論文集 Vol.6 No.-
5,7-diiodo-8-hydroxyquinoline(DIHQ)의 Amberilte XAD -4 및 XAD-7 수지에 대한 최적흡착 pH는 pH3.0-7.0 영역이다. 이 pH에서 XAD-4 및 XAD-7 수지에 대한 DIHQ의 침윤량은 각각 3.10×10?²mmol DIHQ/g, XAD-4 resin와 1.80× 10?²mmol DIHQ/g, XAD-7resin이었다. DIHQ-XAD-4 및 DIHQ-XAD-7 침윤수지는 pH 3.0-7.0 영역에서 안정하였으며, 특히 DIHQ-XAD-4수지의 경우에는 횹착된 금속이온의 회수에 사용되는 용리액인 HCI의 농도가 증가하여도 안정도가 감소하지 않았으며 DIHQ-XAD-7수지의 경우에는 HCI의 농도의 증가에 따라 안정도가 감소하였다. DIHQ-XAD침윤수지에 대한 금속이온의 흡착은 Cu(Ⅱ), Cd(Ⅱ) 및 Ni(Ⅱ)의 경우에는 pH 9.0에서 최대흡착을 보였으며 이때 각 금속이온의 흡착몰비(금속이온 : DIHQ)는 1:2이었으며, Fe(Ⅲ)의 경우에는 3.0-4.0 영역에서 최대흡착을 보였으며 이때 흡착몰비는 1 :3이었다. DIHQ-XAD-4 및 DIHQ-XAD-7 침윤수지에 흡착된 금속이온은 각각 5M HCl 및 1M HCI 용액으로 용리하였을 때 정량적으로 회수되었으며, DIHQ-XAD-4침윤수지의 경우엔는 5M HCl을 용리액으로 사용하였을때 침윤량의 감소없이 5회이상 재사용이 가능하였으나 DIHQ-XAD-7 침윤슈지의 경우에는 1M HCl을 용리액으로 사용하였을때 5회 재사용에서 침윤량이 1/2로 감소하였다. The adsorption behavior of 5,7-diiodo-8-hydroxyquinoline(DIHQ) on Amberlite XAD-4 and -7 resins was investigated by measuring its distribution coefficients under various experimental conditions, such as shaking time, pH and concentration of organic solvent in medium. The application of DIHQ-impregnated-XAD resins for adsorption and separation of metal ions was studied. The maximum adsorption of DIHQ on XAD resins was observed in 30% acetone solution having pH range from 3.0 to 7.0. The impregnation capacities of XAD resins for DIHQ were 3.10 × 10?²mmol DIHQ/g,XAD-4resin and 1.80 × 10?²mol DIHQ/g,XAD 7 resin respectively. The DIHQ-impregnated-XAD resin was stable in pH range from 3.0 to 7.0 and the amount of DIHQ leached from XAD-4resin by eluting with variation of hydrochloric acid concentration, 1 to 5M, was negligible. The optimum pH range for adsorption of metal ions on DIHQ-impregnated-XAD resin was 9.0 for Cu(Ⅱ), Cd(Ⅱ) and Ni(Ⅱ), and was 3.0 for Fe(Ⅲ), and the adsorption mole ratio of metal ion to DIHQ were 1:2 for Cu(Ⅱ), Cd(Ⅱ) and Ni(Ⅱ), and 1:3 for Fe(Ⅲ) at the above pH range. It was found that the adsorbed metal ions on DIHQ-impregnated-XAD-4 and -7 resin was recovered quantitatively with 5M HCl and 1M HCl respectively. The DIHQ-impregnated-XAD-4 resin could be reusable over 5times without decrease in its impregnation capacity, but DIHO-impregnated-XAD-7 resin was decreased in its impregnation capacity to 1/2 with 1M HCl.
Hantaan virus에 감염된 등줄쥐 폐조직중의 Reovirus 검출
오용주 고려대학교 의과대학 1983 고려대 의대 잡지 Vol.20 No.3
The followings are the results of the detection of Reovirus in the infected lung tissues of Apodemus agrarius with Hantaan virus, the etiologic agent of Hemorrhagic fever with renal syndrome. 1. About one third of infected Apodemus agrarius jejuensis with Hantaan virus revealed Reovirus antigen in the lung tissues and Reovirus antigen showed the quite different immunofluorescent reaction pattern compare with Hantaan virus antigen. 2. It was almost impossible to detect least amount of reovirus antigen in the infected lung tissues of Apodemus agrarius with Hantaan virus by indirect IF antibody technique. 3. Reovirus growed rapidly than Hantaan virus and produced CPE when the Hantaan virus seed of Apodemus mice lungs containing undetectable amount of reovirus by indirect IF technique was passaged several times in A549 cell cultures. 4. The detection of reovirus antigen in the lungs of mice inoculated blood specimens from Hemorrhagic fever with renal syndrome patients was dependent upon individual mouse and the source of reovirus contamination in the Hantaan virus seed was not blood of patients. These findings show that isolation of Hantaan virus from clinical materials and from infected Apodemus mice should be carefully done both in tissue culture cells and in normal Apodemus mice because about one third of Apodemus agrarius captured in nature were infected with Reovirus.
Genetic Algorithm을 이용한 다중 프로세서 일정계획문제의 효율적 해법
吳勇周,朴承憲 한국경영과학회 1995 한국경영과학회 학술대회논문집 Vol.- No.2
Generally the Multiprocessor Scheduling(MPS) problem is difficult to solve because of the precedence of the tasks, and it takes a lot of time to obtain its optimal solution. Though Genetic Algorithm(GA) does not guarantee the optimal solution, it is practical and effective to solve the MPS problem in a reasonable time. The algorithm developed in this research consists of a improved GA and CP/MISF(Critical Path/Most Immediate Successors First). A new genetic operator is derived to make GA more efficient. It runs parallel CP/MISF with GA to complement the faults of GA. The solution by the developed algorithm is compared with that of CP/MISF, and the better is taken as a final solution. As a result of comparative analysis by using numerical examples, although this algorithm does not guarantee the optimal solution, it can obtain an approximate solution that is much closer to the optimal solution then the existing GA's.