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Ni-Fe/YSZ 코어-쉘 구조 연료극을 사용한 다전지식 고체산화물 연료전지의 전기화학적 특성
안용태,지미정,황해진,이민진,홍선기,강영진,최병현,An, Yong-Tae,Ji, Mi-Jung,Hwang, Hae-Jin,Lee, Min-Jin,Hong, Sun-Ki,Kang, Young-Jin,Choi, Byung-Hyun 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
An Ni-Fe/YSZ core-shell structured anode for uniform microstructure and catalytic activity was synthesized. Flat tubular segmented-in-series solid oxide fuel cell-stacks were prepared by decalcomania method using synthesized anode powder. The Ni-Fe/YSZ core-shell anode exhibited better electrical conductivity than a commercially available Ni-YSZ cermet anode. Also power output increased by 1.3 times with a higher open circuit voltage. These results can be attributed to the uniformly distributed Ni particles in the YSZ framework. The impedance spectra of a Ni-Fe/YSZ core-shell anode showed comparable reduced ohmic resistance similar to those of the commercially available Ni-YSZ cermet anodes.
SOFC anode용 나노구형 Ni<sub>(1-x)</sub>-M<sub>(x=0~0.15)</sub>(M=Co, Fe) alloy 분말 합성 및 그 특성
이민진,최병현,지미정,안용태,홍선기,강영진,황해진,Lee, Min-Jin,Choi, Byung-Hyun,Ji, Mi-Jung,An, Young-Tae,Hong, Sun-Ki,Kang, YoungJin,Hwang, Hae-Jin 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
In this study, the reducing agent hydrazine and precipitator NaOH were used with $NiCl_2$ as a starting material in order to compound Ni-based material with spherical nano characteristics; resulting material was used as an anode for SOFC. Synthetic temperature, pH, and solvent amounts were experimentally optimized and the synthesis conditions were confirmed. Also, a 0 ~ 0.15 mole ratio of metal(Co, Fe) was alloyed in order to increase the catalyst activation performance of Ni and finally, spherical nano $Ni_{(1-x)}-M_{(x=0{\sim}0.15)}$(M = Co, Fe) alloy materials were compounded. In order to evaluate the catalyst activation for hydrocarbon fuel, fuel gas(10%/$CH_4$+10%/Air) was added and the responding gas was analyzed with GC(Gas Chromatography). Catalyst activation improvement was confirmed from the 3% hydrogen selectivity and 2.4% methane conversion rate in $Ni_{0.95}-Co_{0.05}$ alloy; those values were 4.4% and 19%, respectively, in $Ni_{0.95}-Fe_{0.05}$ alloy.
환자로부터 분리한 Klebsiella pneumonia의 항생제 내성에 관한 연구
池寧鎭,白亨基,洪性魯,曺道鉉 동남보건대학 2000 論文集-東南保健大學 Vol.18 No.2
One hundred strains of Klebsiella pneumoniae were isolated from feces of dysentenc patients who were resistant to ampicillin but sensitive to nalidixic acid. Sixteen out of the 100 isolates were resistant to chloramphenicol and cephalothin, 16 to tetracycline, 13 to streptomycin, 8 to kanamycin and 2 to gentamycin. The distribution of resistance to different combination of eight antimicrobioal agents was as follows. 68% were resistant to 2 antibiotics, 15% to the combination of three antibiotics, 12% to the mixture of 4 chemicals, 6% to 5 mixture, 3% to 6 antibiotics and 2% to the combination of 7 antibiotics. Electorphoresis patterns of the plasmid DNA of K. pneumoniae were investigated. 98KP8. 98KP9 and 98KP10 had a plasmid of 45.8Md, 44.1Md and 47.8Md, respectively. 98KP1 had four plasmids where their molecular weight larged from 29.2Md to 81.2Md 98KP2 also had four plasmids and the molecular weight ranged from 4.9Md to 94.1Md The EcoR I restriction fragments of the K. pneumoniae R plasmid DNA were sperated by elctrophoresis The EcoR I restriction fragment analysis showed that there is no correlation between the number of plasmid and the diversity of the fragment Moreover we could not observe the similarity of the fragment among the strains which have the same resistance against the same combination of antibiotics.
18S-srRNA 분석에 의한 Acantbamoeba 한국 분리주들의 분류 검토
신호준,지영진,조명수,김형일,박연희,임경일 아주대학교 의과학연구소 1998 아주의학 Vol.3 No.2
Acanthamoeba spp. spread in soil, ponds, air and swimming pool, cause a granulomatous amoebic meningitis and amoebic keratitis in human and experimental animals. Their classification had depended upon morphological characteristics and physiological conditions such as thermophilic status and generation times. However, because amoeba species showed the morphological and physiological diversity in isolates, many attempts have been made on identification of Acanthamoeba spp. Restriction fragments length polymorphism (RFLP) analysis of IBS-small subunit ribosomal RNA (srRNA) was an useful tool for classification among morphologically and genetically closely-related species. In this study, 18S-srDNAs of amoebae were amplified by PCR with primer encoding 18S-srRNA gene and digested with restriction endonudeases, and RFLP analysis was applied on classification of Acanthamoeba Korean isolates (YM-4, YM-5 and YM-7), comparing with reference amoebae, A. culbertsoni, A. polyphaga and A. royreba. Trophozoites of six Acanthamoeba spp. had typical acanthopoda, but did not show any morphological differences. Cyst of Acanthamoeba sp. YM-7 was similar to that of A. polyphaga which was designated as group Ⅱ Acanthamoeba. Morphologically other amoebae belonged to group Ⅲ Acanthamoeba. Digestion of 18S-srDNA with six enzymes, Dde Ⅰ, Hae Ⅲ, Hind Ⅲ, EcoR Ⅰ, Rsa Ⅰ and Sph Ⅰ, resulted in various DNA fragments. Using the method of Nei and U (1979) for RFLP analysis, genetic divergence was not observed between A culbertsoni and Acanthamoeba sp. YM-4. Between A. culbertsoni and Acanthamoeba sp. YM-5, genetic distance was 0.070, 0.364 between Acanthamoeba sp. YM-4 and A. polyphaga, and 0.277 between Acanthamoeba sp. YM-7 and A. polyphaga. In comparison with A. culbertsoni and A. polyphaga, Acanthamoeba sp. YM-7 showed genetic distance of 0.330 and 0.154, respectively. Thus, Acanthamoeba sp. YM-7 is a similar species to A. polyphaga. Acanthamoeba sp. YM-5 is a different species from A. polyphaga, but closely-related to A. culbertsoni. Acanthamoeba sp. YM-4 can be classified as a subspecies or a strain of A. culbertsoni.