• Korean Journal of Poultry Science
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• v.13 no.2
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• pp.173-178
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• 1986

Data on egg production, egg weight and egg mass were obtained from a sample of the Synthetic White Leghorn population which was raised at Poultry Breeding Farm, Seoul National University. Egg mass was not measured directly, but was calculated from the egg numbers and the average egg weight for same period. Phenotypic means, components of variance and covariance, heritabilities and genetic correlations were computed. Egg mass was estimated to be a lowly heritable trait (0.204-0.270). High heritability estimates were found for age at sexual maturity and egg weight. Genetic correlation estimates were high and positive between egg mass and egg number(combined estimates 0.711). Egg mass and egg weight were moderately correlated genetically (0.431). Genetic correlation estimates was -0.280 between egg number and age at sexual maturity, but was 0.524 between egg weight and age at sexual maturity. Results show that selection for total egg mass based on record from a single period will not be satisfactory unless the single period chosen is one in the latter part of the laying year.

• KOREAN POULTRY JOURNAL
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• v.7 no.10 s.72
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• pp.63-66
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• 1975

양계업의 성공 여부는 산란계 한 마리가 년간 몇 개의 알을 낳느냐에 의하여 결정된다. 일반적으로 산란지수가 많은 계군이 산란피크도 높으므로 더 많은 알을 얻기 위한 방법으로는 산란피크를 향상시켜야 할 것이다. 그러나 아직도 많은 농장에서 보다 빠른수입을 목적으로 또는 관리 부주의로 조산을 시키는 경향이 있다. 조산하게 되면 산란율이 정상적으로 오르지 못하므로 30$\~$33주령이 되어도 산란피크가 보잘 것 없게 되며 이때야 비로소 여러 가지 방법을 강구하지만 이미 닭의 산란능력이 결정되었으므로 보다 좋은 성적은 기대하기 어렵다. 닭의 산란생리는 일단 산란피크에 도달한 다음 산란율이 일정한 비율로 서서히 떨어지게 되어 있다. 그러므로 산란피크가 얼마나 올라가느냐는 장차 계군이 몇 개의 알을 생산할 수 있는가를 예측하는 기준이 될 수 있다.

• Journal of Ginseng Research
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• v.13 no.2
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• pp.174-177
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• 1989

The ovipositional preferences of Holotrichia morosa were investigated to defermine several environmental factors related to its incidence in ginseng fields. H. moroia paid no eggs in naked soil without ground color plants, and shouted ovipositional preference among weed plants in the order to Aurmisin prinrcps var oripntnlis, Epigrren canadensis Diuitarin sanguinalis, and Porttulaca oleracea. More oviposition was observed in the denser vegetation of D. sanguinalis and in soft soil. The egg-laying females were seldom attracted to fresh rice straw mulched on soil surface or decayred rite straw mixed into soil. The number of eggs laid by a female decreased considerably when the soil moisture content was below 5% or above 35%.

• Journal of Sericultural and Entomological Science
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• v.35 no.2
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• pp.100-104
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• 1993

The genetics analysis for weight of matured silkworm(WMS) and number of eggs produced per moth(NEM) was studied by the seven parents diallel. Mean squares of additive effect, dominant effect, maternal effect and reciprocal effect were significant for two characters observed. The component of genetic variance analysis for WMS and NEM showed that dominant effect was higher than additive effect. Narrow sense heritability(h2ns) estimates were 0.773 and 0.228, in the WMS and NEM. The estimate of broad sense heritability(h2bs) value was higher than that of h2ns because of the low importance of dominance effect. Incomplete dominance was shown by Vr-Wr graphic analysis in the weight of matured silkworm and overdominance in the number of eggs produced per moth. In general combining ability effect, Jam 107 and Jam 124 was showed positively high for WMS and Jam 107 and S1 was expressed positively high for NEM. In specific combining ability effect, hybrids in S1XC51, S1XJam124 and Jam 107XJam 108 were exhibited positively high for WMS and Jam 107XN63, S1XC51, N74XJam 108 and Jam 107XJam 108 were found positively high for NEM.

• Korean Journal of Poultry Science
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• v.9 no.1
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• pp.35-42
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• 1982

Data pertaining to the first generation of a Synthetic White Leghorn flock were used to estimate the heritabilities of and genetic correlation between partial egg production(egg number or percentage) or diversely segmented part records and other traits such as age at sexual maturity, residual and annual egg production, and to compare the expected genetic gain from selection on partial egg number or partial percent production with correlated response in other traits. The estimated heritabilites for six measures of egg Production were ranged from 29 to 35, while heritability for age at sexual maturity (SM) was intermediate (48). Genetic correlations between partial egg number (P) and annual egg number. (A), and partial percent production (P') and annual percent production (A') were 51 and 72, respectively. Genetic correlation between P and SM was estimated largely negative (-.64), while correlation bettween P' and SM was positively intermediate(34). In comparing direct response from selection on partial production (P or P') with another response in correlated trait, selection on P would be 25% more efficient than selection of P' for improving A, while selection of P' would be 94% more efficient than selection P for improving A' For shortening SM selection of P would be 98% more efficient than selection on P'.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.2 no.4
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• pp.39-46
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• 1991

전자파 문제는 넓은 의미로 산란(scattering)문제와 역산란(inverse scattering)문제로 나눌 수 있다. 먼저 산란 문제는 에너지 또는 정보가 실린 전자파를 한 지점에서 다른 지점으로 보낼 때 통과하는 경로상의 매질 분포에 따라 왜곡 또는 변형되는 정도를 알아내는 것으로 반사(reflection), 굴절(refraction), 회절(diffraction)등 의 현상을 수반한다. 이 때 전자파를 왜곡시키는 물체를 산란체라고 부르며, 이러한 산란체로서는 전송선, 도파관, 광섬유 등과 같은 도파구조(guided wave structure)자체일 수 있으며 그들 내부에 고의로 부착된 첨가물일 수도 있다. 또한 공기나 지하와 같은 개방 구조 내의 물체나 비균일 매질 분포도 산란체가 될 수 있다. 이와는 반대로 역산란 문제는 알고 있는 전자파를 미지의 산란체에 가한 후, 여기서 산란된 전자파를 측정하여 얻은 자료로 부터 역으로 산란체의 위치, 크기, 모양, 매질 특성 등을 알아내는 것이다. 이러한 역산란 문제는지하 탐사(geophysical probing), 원격탐사(remote sensing), 레이다 영상(radar imaging), 의료진단(medical diagnosis), 비파괴 검사(nondestructive testing)등과 같은 많은 응용분야에 걸쳐 있다. 본 원고에서는 전자파 산란 및 역산란 문제에 대한 기존의 다양한 해석기법들을 체계적으로 분류하고, 이들의 적용범위와 한계에 대해 간략히 소개하기로 한다.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.4 no.2
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• pp.82-90
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• 1993

전자파에 의한 산란현상의 해석은 지금까지 주로 시간조화함수의 형태를 지닌 전원에 의한 정 상상태의 산란에 관하여 이루어졌다. 그러나 레이다나 피파괴 검사, 전송선로 점검 등의 응용에서는 주로 펄스형태의 전자파를 사용하며, 따라서 시간에 따라 변화하는 함수형태의 전원에 의한 전자파의 산란해 석이 중요한 문제로 등장하였다. 또한 통신선로에서 외부의 잡음에 대한 혼신 등을 해석하거나, 낙뢰가 송 전선로에 미치는 영향을 해석하는 데에도 펄스신호의 산란해석이 필수적이다. 일반적인 함수의 형태를 지닌 전원에 의한 산란현상을 해석하기 위해서는 전원함수를 Fourier 변환하 여 주파수 영역의 스펙트럼을 구하고, 주파수영역에서의 산란해를 이용하여 Fourier 역변환을 하여 시간 영역의 해를 구할 수 있다. 주파수 영역에서의 산란판의 해를 Fourier 역변환 하기 위해서는 적분을 행하여야 하며, 일반적으로 적분과정에서 매우 복잡한 계산이 필요하고, 산란체의 구조가 복잡하여 해석 적인 해를 구할수 없는 경우에는 해석적으로 시간영역의 해를 구하는 것이 불가능하다. 시변 함수에 의 한 산란파를 구하기 위한 수치해석적 방법으로는 모멘트방법이나 유한요소법(Finite Element Method), 경계요소법(Boundary Element Method), 유한차분법(Finite Difference Method)등이 있으며, 해석적 해 를구할 수 없는 경우에 적용할 수 있는 반면에 많은 계산량이 요구된다.

• Korean Journal of Poultry Science
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• v.15 no.3
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• pp.211-218
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• 1988

Data on egg number from time of first lay to 71 week of age were obtained from samples of single comb white leghorn breeder and brown layer breeder populations which were raised at manny breeding Co. These data were used to estimate the heritabilities of age at sexual maturity, early egg number, residual egg number and annual egg number. Also, the genetic correlation coefficients between these traits were estimated and selection efficiencies of each segment in early part record were estimated by use of the heritabilities and generic correlations. The estimated heritabilities and standard errors in two lines(W and B) were $0.30\pm0.07$ and $0.33\pm0.08$ at early records, $0.19\pm0.06$ and $0.18\pm$0.05 at residual records and $0.37\pm0.09$ and $0.49\pm0.10$ at time of first lay. Those at annual records were $0.24\pm0.06$ equally. The estimated correlation coefficients and standard errors between early record and annual record were $0.76\pm0.08$ and $0.77\pm0.07$. Those between early record and residual record were $0.46\pm0.15$ and $0.39\pm0.16$ respectively. At improving annual egg production per year, selection based on early part record(SM to 40 week of age) would be 69% more efficient than on annual record in line W and 80% more efficient than on annual record in line B. But, if it were considered that egg weight decreased due to sexual maturity and cost for data collection, use of selected segment from 35~40week of age in line W and from 31~40 week of age in line B would be desired in spite of a. small loss in relative selection efficiency. The generation interval would not be shortened.

• KOREAN POULTRY JOURNAL
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• v.41 no.7
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• pp.112-115
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• 2009

'위생적인 계란 생산'을 최고의 가치로 생각하는 박철주 대표의 신림양계장을 찾아보았다. 신림양계장은 강원도 원주시 신림면 성남리에 위치한 산란계 농장으로, 산란계 31,000수와 중추 21,000수를 사육하고 있다. 11년간 산란계를 키운 박 대표는 무항생제 인증은 물론 강원도에서 최초로 산란계 HACCP인증을 획득했을 정도로 위생에 대한 관심이 뜨거웠다.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2002.11a
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• pp.140-142
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• 2002

This study was conducted to obtain some genetic information for developing superior Korean native chickens. Heterosis and combining ability effects were estimated with 1,080 progenies of full diallel crosses of 3 strains in Korean Native Chicken. The traits of egg productivity were Investigated, and heterosis effect, general combining ability, specific combining ability and reciprocal effect were analyzed model I of the Griffing's method 1. The general performance were 147.0 days in age at first egg laying, 71.8 eggs in egg numbers to 270 days, 50.1g in egg weight at 270 days, 75.6 in egg shape index, 356$\mu\textrm{m}$ in egg shell thickness, and 4.27kg/$\textrm{cm}^2$ in egg shell strength, respectively. According to result, heterosis effect revealed comparatively high in age at first egg laying, egg numbers, egg weight, and egg shell strength. The effects estimated highly in general combining ability for age at first egg laying, egg numbers, egg weight, egg shape Index and egg shell thickness, and in specific combining ability were egg numbers, egg weight and egg shell thickness, and in reciprocal effects for egg numbers, egg shape index, and egg shell thickness. This result could be used for developing Korean native chicken.