http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
가축의 장관에서 분리되는 Bifidobacterium속 세균의 특성조사 및 장내세균총 분포에 관한 연구
이완규,Lee, Wan-kyu 대한수의학회 1994 大韓獸醫學會誌 Vol.34 No.1
The present study was undertaken to obtain the basic knowledge on the distribution of intestinal microflora and characterization of Bifidobacterium isolated from the intestine of cattle, pigs, chicken and dogs. Bacteroidaceae and Streptococcus were isolated from the feces of cattle as predominant organisms, and Bifidobacterium was in counts of $8.65{\pm}0.21$ log 10 organisms. Bacteroidaceae, Eubacterium and Peptococcaceae counts on the feces of pigs were particularly high, but Bifidobacterium did not isolated. In hens and dogs, the counts of Bifidobacterium were $7.60{\pm}0.71$ and $8.15{\pm}2.04$ log 10 organism, respectively. Isolated 7 Bifidobacterial strains were identified respectively to B. thermophilum from cattle, B. pullorum and B. animalis from pigs, and B. longum, B. adolescentis and B. pseudolongum from dogs by their carbohydrate fermentation ability.
Spin-on Dielectric 막의 전기적 특성에 미치는 전구체의 영향
이완규,Lee, Wan-Gyu 한국재료학회 2011 한국재료학회지 Vol.21 No.4
Polysilazane and silazane-based precursor films were deposited on stacked TiN/Ti/TEOS/Si-substrate by spin-coating, then annealed at $150{\sim}400^{\circ}C$, integrated further to form the top electrode and pad, and finally characterized. The precursor solutions were composed of 20% perhydro-polysilazane ($SiH_2NH$)n, and 20% hydropolymethyl silazane ($SiHCH_3NH$)n in dibutyl ether. Annealing of the precursor films led to the compositional change of the two chemicals into silicon (di)oxides, which was confirmed by Fourier transform infrared spectroscopy (FTIR) spectra. It is thought that the different results that were obtained originated from the fact that the two precursors, despite having the same synthetic route and annealing conditions, had different chemical properties. Electrical measurement indicated that under 0.6MV/cm, a larger capacitance of $2.776{\times}10^{-11}$ F and a lower leakage current of 0.4 pA were obtained from the polysilazane-based dielectric films, as compared to $9.457{\times}10^{-12}$ F and 2.4 pA from the silazane-based film, thus producing a higher dielectric constant of 5.48 compared to 3.96. FTIR indicated that these superior electrical properties are directly correlated to the amount of Si-O bonds and the improved chemical bonding structures of the spin-on dielectric films, which were derived from a precursor without C. The chemical properties of the precursor films affected both the formation and the electrical properties of the spin-on dielectric film.
50 nm 이상의 CMOS 기술에 이용되는 Spin-on Dielectric 박막 형성과 그 특성에 미치는 전구체의 영향
이완규,Lee, Wan-Gyu 한국진공학회 2011 Applied Science and Convergence Technology Vol.20 No.3
탄소가 없는 폴리실라잔 계와 탄소가 함유된 폴리메틸 실라잔 계 전구체를 실리콘 기판에 스핀코팅하고 $150^{\circ}C$, $400^{\circ}C$, $850^{\circ}C$에서 열처리하여 형성된 박막의 물리적 화학적 특성을 평가하였다. 프리에 변환 적외선 분광, 수축 율, 갭-충진, 식각속도 등을 평가하여 박막형성과 형성된 박막의 물리화학적 특성에 미치는 탄소의 영향을 고찰하였다. 탄소함유 전구체는 (탄소가 없는 전구체보다) $400^{\circ}C$에서 질소, 수소, 탄소의 휘발량이 더 적고 산소 흡수량이 더 적어서 (15.6%)보다 낮은 14.5% 두께 수축을 나타내었으나, $800^{\circ}C$에서는 휘발 량이 더 많고 산소 흡수량도 더 많아져 (19.4%)보다 높은 37.4% 두께 수축을 나타냈다. 프리에 변환 적외선 분광분석결과, 전구체내의 탄소는 Spin-on dielectric (SOD) 박막으로 하여금 Si-O 결합형성을 적게, 박막특성을 불균일하게, 그리고 화학 용액에 더 빨리 식각되도록 만들었다. Polysilazane and polymethylsilazane based precursor films were deposited on Si-substrate by spin-coating, subsequently annealed at $150{\sim}850^{\circ}C$, and characterized. Structural analysis, shrink, compositional change, etch rate, and gap-filling were observed. Annealing the precursor films led to formation of spin-on dielectric films. C-containing precursor films showed that less loss of N, H, and C while less gain of O than that of C-free precursor films at $400^{\circ}C$, but more loss of N, H, and C while more gain of O at $850^{\circ}C$. Thus polysilazane based precursor films exhibited less reduction in thickness of 14.5% than silazane based one of 15.6% at $400^{\circ}C$ but more 37.4% than 19.4% at $850^{\circ}C$. FTIR indicated that C induced smaller amount of Si-O bond, non-uniform property, and lower resistance to chemical etching.
이완규,Lee, Wan-kyu The Korean Society of Veterinary Science 1994 大韓獸醫學會誌 Vol.34 No.1
홀스타인 젖소의 분변에서 우세균종으로 분리되는 동정불능 Clostridium균주에 대해 당분해 성상검사, 생화학적 성상검사, G+C mol% 측정, 유사 균종과의 DNA-DNA hybridiazation 등을 조사한 결과, 기존의 clostridium균종과는 성상이 일치하지 않는 새로운 신균종(New Species)임이 처음으로 밝혀져, 이 균주를 Clostridium bovis로 분류, 명명하였다. 이 C. bovis는 그램 양성, 운동성의 편성 혐기성 아포형성 간균이었으며, 당분해 성상은 arabinose, xylose, glucose, mannose, fructose, galactose, sucrose, maltose, cellobiose, lactose, trehalose, melibiose, raffinose, inulin, salicin을 분해하였다. Gas chromatography를 사용하여 PYFG broth로부티의 최종대사산물(End products)를 측정한 결과, 다량의 butyric, lactic acid와 소량의 acetic, succinic acid를 생산하였다. C. bovis의 Type strain은 Catt $66^T$이며, G+C mol%는 26 mol%이 었다. Clotridium bovis sp. nov, is described on the basis of 5 strains isolated from the feces of Holstein cattle. The isolate are gram-positive, motile, strict anaerobic spore forming rods. They differ from all the validly described related species of the genus Clostridium in carbohydrate fermentation pattern, G+C mol% and DNA homologies. Acid is produced from arabinose, xylose, glucose, mannose, fructose, galactose, sucrose, maltose, cellobiose, lactose, trehalose, melibiose, raffinose, inulin and salicin. Major end products in PYFG broth are large amounts of butyric acid and lactic acid, and trace amounts of acetic and succinic acids. The G+C mol% of DNA from the type strain is 26 mol%. The type strain of Clostridium bovis is Catt $66^T$ strain.
디스크 부식에 의한 DTV 변화에 패드 마모가 미치는 영향 연구
이완규(Wankyu Lee),이강국(Kangkuk Lee),이인호(Inho Lee),현보원(Bowon Hyun),이성주(Seongju Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The rust judder due to the disc corrosion have been known as a serious problem on automobile. Among various sources on the rust judder of vehicle, in this paper, the influence of brake pad wear particles was investigated using rig unit and vehicle with different friction materials. Results showed that the amount of wear particles critically affected to the change of DTV and to make a contact trace on the disc surface after corrosion test. In the case of pad material with the largest wear amount, the vibration of brake pedal and steering after corrosion was strongly felt during all braking stop in contrast with wear life enhanced pad material. Furthermore, the wear amount of disc was related with the linear change of DTV by corrosion. This study shows that the occurrence level of rust judder due to friction material can be predicted at the development stage of friction material.