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Streptomyces coelicolor의 pat 유전자 5'-Flanking Region의 염기서열
박경현,채영규,최영길,박영석 漢陽大學校 基礎科學硏究所 1994 基礎科學論文集 Vol.13 No.-
Streptomyces coelicolor의 phosphinothricin acetyltransferase (pat)유전자는 phosphinothricin(PPT) 저항성 유전자들로부터 고안된 primer를 사용하여 클로닝되었다. Southern blot 분석결과 S. coelicolor에서 얻어진 2.1-kb DNA 절편은 S. hygroscopicus의 bar유전자를 DNA-DNA hybridization 하였다. 본 논문은 S. coelicolor의 pat 유전자의 5'-flanking region의 염기서열을 분석하였다. The pat gene of Streptomyces coelicolor strain was cloned by using primers designed from the PPT resistant genes. Southern blot analysis was revealed a DNA-DNA hybridization between the obtained 2.1-kb DNA fragment from S. coelicolor and bar gene from S. hygroscopicus. This paper was analyzed for the nucleotide sequence about the 5'-flanking region of pat gene from S. coelicolor.
K. H. Chai,N. H. Heo,J. G. Na,S. R. Lee,J. S. Woo 한국자기학회 1998 Journal of Magnetics Vol.3 No.2
Scanning Electron Microscopy with Polarization Analysis (SEMPA) was used to image the surface magnetic domain structure of the 100 ㎛ thick 3% Si-Fe sheet. The thin-gauged 3% Si-Fe strips with magnetic induction (B_(10)) from 1.98 to 1.57 Tesla were prepared via conventional metallurgical processes including melting, hot- and cold-rolling, intermediate annealing and final annealing. Using SEMPA, it was observed that the B_(10) (1.98 T) Tesla sample was almost composed of 180° stripe domains which are parallel to rolling direction. On the other hand the 3% Si-Fe sheet with B_(10) (1.57 T) Tesla was composed of large 180° stripe domains that are slanted about 30° to the rolling direction and complex magnetic domain structures like tree and zigzag pattern. The 180° stripe domains, which covered a major part of the sample, had (110)<001> Goss texture parallel to the rolling direction. The domain walls between 180° stripe domains were the conventional Bloch type walls. On the other hand, the 90° domains, which covered minor part on edge of the sample, were observed in (200) grains. The domain walls between 90° domains were the Neel type walls. In high magnification, the elliptical singularity at the Neel walls was clearly observed.
K. H. Chai,J. G. Na,N. H. Heo,J. C. Kim,S. R. Lee,J. S. Woo 한국자기학회 1999 Journal of Magnetics Vol.4 No.1
Effect of sulfur segregation on tertiary recrystallization and magnetic induction during final annealing was investigated in a 3% Si-Fe electrical strip containing 6 ppm (LS) and 15 ppm (HS) sulfur. During final annealing, Auger peak height of segregated sulfur on the surface of the strips reached a maximum, and then decreased to low level with increasing annealing time, which is attributed to sulfur segregation and evaporation. The magnetic induction of the thin-gauged 3% Si strip was inversely proportional to the Auger peak height of segregated sulfur on the surface. The overall profile for surface segregation of sulfur and B_(10) was observed, irrespective of sulfur content in Si-Fe strips, but the peaks of LS strips appeared earlier than those of HS strips. The grain growth rate of the LS strips during final annealing was faster than that of the HS strips, which may be attributed to the pinning effects of segregated sulfur. With increasing final annealing temperature, B_(10) value increased rapidly and the saturation level in B_(10) increased.
에지 검출과 split and merge의 통합에 의한 영상 분할
채규열(K. Y. Chai),전병문(B. M. Jeon),정창성(C. S. Jeong) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.2A
영상 분할 방법 중 split and merge를 사용할 경우 발생하는 문제점은 세가지가 있다. 분할된 각 영역의 경계선이 입력 영상의 에지와 정확하게 일치하지 않는다는 것과 결과 영상으로부터 잡음으로 간주될 수 있는 작은 크기의 영역들이 많이 발견된다는 것이다. 이 두가지 문제점을 해결하기 위해 본 논문은 입력 영상을 전처리로써 에지 검출한 후 split and merge를 하는 에지 - split and merge 방법을 제시한다. 또한 단순 split and merge의 세번째 문제점은 에지라고 보이는 입력 영상의 일부분이 실제 분할된 결과 영상에서 같은 영역으로 나타나는 경우인데 앞에서 제시한 방법을 보완하여 이 문제를 해결하였다. 즉 모든 에지를 찾기 위해 경우에 따라 에지 threshold 값을 변화시키고 합병이 되지 않도록 새로운 값을 부여하는 split - 에지 - split and merge 방법을 제시한다.