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Zolotarev 다항식을 이용한 2-D 노치 필터의 설계
조광현(K.H. Cho),김경재(K.J. Kim),남상원(S.W. Nam) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
본 논문에서는 효율적인 2-D FIR 노치필터 디자인 방법 제안한다. 주파수대역에서 bandstop 필터 형태를 보이는 Zolotarev 다항식을 Chebyshev 다항식으로 확장 적용한 1-D dc 노치필터의 설계 방법, 주파수 이동, 그리고 임펄스 응답의 2-D 선형 컴볼루션을 이용하여 효율적인 2-D FIR 노치 필터설계 방법을 제안한다. 시뮬레이션을 통하여, 설계된 2-D 노치필터 특성을 검증한다.
이광전(K . J . Lee),강민식(M . S . Kang),조광현(K . H . Cho),강민구(M . G . Kang),이상기(S . G . Lee) 한국축산학회 1994 한국축산학회지 Vol.36 No.6
This study utilized 10,502 linear type scores collected by KAIA from 1984 to 1993 with records consisting of 15 primary traits and final score. The results obtained were as follows ; 1. Rump width scores were positively correlated with parity and age but udder support scores were negatively correlated with them. 2. Among the age and lactation groups, the over-3rd parity group had tower fore-udder attachment scores than the 1 st or 2nd parity groups. 3. A multiplicative adjustment factor was more suitable for adjusting type scores than additive adjustment factor. 4. It was suggested that establishment of a base score is necessary to develop adjustment factors for each type trait.
이광전(K . J . Lee),박경도(K . D . Park),강민식(M . S . Kang),강민구(M . G . Kang),이연근(Y . K . Lee),조광현(K . H . Cho),최재봉(J . B . Choi) 한국축산학회 1993 한국축산학회지 Vol.35 No.6
This study was undertaken to identify the changes of variance components for herd production levels of milk. Milk records were divided into low, medium, and high groups by average herd production, average herd-year production, herd standard deviation, and herd-year standard deviation. Herd standard deviations increased with average herd productions. Correlation between average herd production and herd standard deviation was 0.41, while correlation between average herd-year production and herd-year standard deviation was 0.47. Residual variance components of higher production increased remarkably, while genetic variance components of high group by herd-year standard deviation showed the same increasing trend. When records are transformed to logarithms, however, residual components of variance didn`t show the increasing trend, and the changing ratio decreased markedly without homogeneous variance components. In order to account for the heterogeneity of milk among herds, the optimum classifying criterion was an average herd-year production level. Estimates of heritabilities for low, medium and high groups were 0.185, 0.237, and 0.283, respectively. These results remarkably showed the heterogeneity of milk among dairy herds.
이광전(K . J . Lee),박경도(K . D . Park),강민식(M . S . Kang),조광현(K . H . Cho),이상기(S . G . Lee) 한국축산학회 1994 한국축산학회지 Vol.36 No.6
To examine effects of age and lactation stage on linear type traits, this study was undertaken by analyzing the 15 primary traits and the final score, collected on the linear type scores of a total of 10,502 Korean Holstein cattle from KAIA(Korea Animal Improvement Association). The results obtained are as follows: 1. Type traits which showed significantly affected by both age and lactation stage were strength, body depth, rump width, fore udder attachment, udder support, udder depth, and final score. Generally, among the numbers of parity, the distinction was significant. 2. Interacting type traits between parity and lactation stage were fore udder attachment, rear udder depth, and final score. 3. Type traits showing vivid linear interaction with age were height, strength, body depth, mmp length, rump width, legs(side view), udder support, and udder depth. The type traits other than udder support and udder depth increased with the linear scores during aging. 4. Throughout lactation stages, rear udder height, udder support, and udder depth showed the non-linear interaction. When rear udder height and rear udder width increased with aging, the scores decreased. However, the other traits increased. This study showed the significant differences in effects of age and lactation stage on linear type traits, hence development of adjustment factors for linear type traits was needed.