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S, J, K 주파수영역에서 MgFe₂O₄ 단결정의 강자성공명 연구
박만장(M. J. Park),김기현(K. H. Kim),이혜정(H. J. Lee),김영호(Y. H. Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.5
We have manufactured FMR spectrometer over wide range(2-35 ㎓). In order to test FMR spectrometer, resonance absorption has been measured of the standard sample DPPH. The Q vaules of absorption line are 189-1096. As a result, We noticed that FMR spectrometer has been manufactured well. FMR studies of MgFe₂O₄ single crystal have been performed at S, J, K-band. The resonance lines have been observed for the each orientation of (100) plane at 300 K. The values of the magnetic anisotropy constant K₁ and the spectroscopic splitting g valule have been calculated from the ferromagnetic resonance curve, -2.9×10⁴erg/㎤, 2.02 at 23.89 ㎓, -2.2×10⁴erg/㎤, 1.89 at 5.3 ㎓ and -2.8×10⁴erg/㎤, 2.01 at 3.6 ㎓.
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이광전(K . J . Lee),정길생(K . S . Jung),한상기(S . K . Han),박홍양(H . Y . Park),양영목(Y . M . Yang),박경도(K . D . Park),박동준(D . J . Park) 한국축산학회 1991 한국축산학회지 Vol.33 No.11
This study was carried out with bull calves of high and low breeding value for milk yield, using a pedigree index. At the same time, plasma concentrations of several traits were investigated in order to find out the potential use of indicator traits for the genetic improvement. Results obtained from this study are as follows. 1. Total protein contents of plasma showed significant differences between genetic groups during feeding(P$lt; 0.05), while albumin contents were significantly different during refeeding (P$lt;0.01). Phenotypic correlation between pedigree index and total protein was -0.2111 and this result indicates that further research ias needed for the potential use of indicator traits. 2. Cholesterol concentraions of plasma showed significant differences between genetic groups only during the feeding period, and the content of bull calves with high breeding value was higher than that of lower bull calves. 3. Mean concentrations of glucose were not significantly different between genetic groups of three treatments, while fasting caused a reduction in glucose concentration which increased upon refeeding. 4. Correlation between pedigree index and blood urea nitrogen was -0.0478 and no potential use of indicator traits was found. 5. Concentrations of triglyceride with the high breeding group were lower than those of the low yielding group, and the reversal trend was observed upon refeeding. 6. Phenotypic correlation between total protein and globulin was 0.69. while genetic correlation between cholesterol and triglyceride showed the highest value of 0.97. 7. Heritability and intraclass correlation of cholesterol were estimated as 0.224 and 0.229, respectively. Coheritability of blood urea nitrogen was calculated as -0.03. There was no indication of the potential use of indicator traits.
우상근,최용,임기천,송태용,정진호,이경한,김상은,최연성,박장춘,김병태,Woo, S. K.,Choi, Y.,Im, K. C.,Song, T. Y.,Jung, J. H.,Lee, K. H.,Kim, S. E.,Choe, Y. S.,Park, C. C.,Kim, B. T. 대한의용생체공학회 2002 의공학회지 Vol.23 No.3
양전자방출단층촬영기(Positron emission tomography, PET) 영상 개선을 위하여 적응적 공간 필터를 개발하였으며. 개발한 필터의 성능을 시뮬레이션데이터. 모형 PET 영상과 환자 PET 영상을 이용하여 평가하였다. 경계화소로 검출된 화소와 윈도우내의 모든 화소값이 동일한 화소는 보존하고. 그 외 화소에 대하여 2:7:2 비율로 가중치를 주어 정열한 후 중앙의 9개 화소에 대한 평균값으로 대치하였다. 경계화소를 검출하기 위하여 두 개의 임계값(TH7, TH2)을 이용하였으며. 다음의 조건을 만족하면 경계화소로 판단하였다 . THl ($pix_max{\times}0.1/log_2(NPM)$, NPM :주변값중 최상위 값과 최하위 값을 제외한 주변값들의 평균) 보다 작은 ADs (중앙값과 주변값의 차에 대한 절대값) 개수는 8-k이고. TH2 ($NPM{\times}0.1$) 보다 큰 ADs 개수는 k. 여기서 k는 2, 3 ‥‥ 6의 값을 가진다 성능평가 결과 이 연구에서 제안한 필터가 가우시안 필터, 가중메디안 필터, 부분집합평균메디안 필터 등과 비교하여 우수한 성능을 제공하는 것을 관찰하였다. 본 논문에서 개발한 간단한 적응적 공간 필터는 공간 분해능 저하는 최소화하면서 균일도와 대조도를 향상시키는데 효과적 이여서 정확한 PET 영상 해석에 기여할 것으로 기대된다 A spatially adaptive falter was formulated to imrove PET image qualify and the Performance of the filter was evaluated using simulation and phantom and human PET studies. In the proposed filter. if a pixel was identified as the edge Pixel, the Pixel value was Preserved. Otherwise a Pixel was replaced by the mean of the pixel values weighted by 2:7: 2. A Pixel was identified as the edge Pixel. if it satisfies the following conditions : the number of ADs (absolute difference between center and neighborhood pixels) which is smaller than THl (($pix_max{\times}0.1/log_2(NPM)$, NPM : mean of 6 neighborhood pixels excluding minimum and maximum) is 8-k and the number of ADs which is lager than TH2 ($NPM{\times}0.1$) is k. where k : 2, 3, …, 6. The results of this study demonstrate the superior performance of the Proposed titter compared to Gaussian fitter, weight median filter and subset averaged median filter. The proposed tittering method is simple but effective in increasing uniformity and contrast with minimal degradation of spatial resolution of PET images and thus. is expected to Provide improved diagnositc quality PET images .