• Asian-Australasian Journal of Animal Sciences
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• 제25권6호
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• pp.772-784
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• 2012

Marker-assisted gene pyramiding aims to produce individuals with superior economic traits according to the optimal breeding scheme which involves selecting a series of favorite target alleles after cross of base populations and pyramiding them into a single genotype. Inspired by the science of evolutionary computation, we used the metaphor of hill-climbing to model the dynamic behavior of gene pyramiding. In consideration of the traditional cross program of animals along with the features of animal segregating populations, four types of cross programs and two types of selection strategies for gene pyramiding are performed from a practical perspective. Two population cross for pyramiding two genes (denoted II), three population cascading cross for pyramiding three genes(denoted III), four population symmetry (denoted IIII-S) and cascading cross for pyramiding four genes (denoted IIII-C), and various schemes (denoted cross program-A-E) are designed for each cross program given different levels of initial favorite allele frequencies, base population sizes and trait heritabilities. The process of gene pyramiding breeding for various schemes are simulated and compared based on the population hamming distance, average superior genotype frequencies and average phenotypic values. By simulation, the results show that the larger base population size and the higher the initial favorite allele frequency the higher the efficiency of gene pyramiding. Parents cross order is shown to be the most important factor in a cascading cross, but has no significant influence on the symmetric cross. The results also show that genotypic selection strategy is superior to phenotypic selection in accelerating gene pyramiding. Moreover, the method and corresponding software was used to compare different cross schemes and selection strategies.

• International Journal of Industrial Entomology and Biomaterials
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• 제4권2호
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• pp.121-126
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• 2002

Breeding programme was initiated during November, 1995 with the main objective to breed productive multivoltine breeds/ hybrids with suitable genetic constitution to suit the fluctuating tropical climate prevailed in India. Two multivoltine breeds viz., BL-24 and BL-27 selected were as breeding resource materials from the silkworm germplasm maintained at Central Sericul-tural Research and Training Institute, Mysore. By adopting hybridization, backcrossing inbreeding and selection, a new multivoltine breed namely BL-67. This breed spins light greenish yellow cocoons and cocoon shape is oval with medium to coarse grains. The evolved breed was crossed with five tropical bivoltine breeds viz., NB4D2, CSR2, CSR5, CSR18 and CSR101 to study the combining ability, and identified a superior hybrid, BL67 ${\times}$ CSR101, named as CAUVERY, The hybrid is characterized by high pupation rate (>95%), high shell weight (> 35 cg), high cocoon shell ratio (> 20%), longer filament length (> 900 m) and high neatness (93) with a renditta of 6.5 producing 2A-3A grade silk. The hybrid is selected for Race Autho-rization test of Central Silk Board.

• 한국통신학회논문지
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• 제34권10C호
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• pp.983-991
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• 2009

H.264 영상압축표준은 우수한 부호화 성능 때문에 현재 DMB와 IPTV 등에 다양한 응용에 활용되고 있으나, 높은 계산량으로 인하여 임베디드 환경에서의 실시간 부호화기로의 활용은 매우 제한적이다. 본 논문은 DSP 시스템이 제공하는 컴파일러 옵션 최적화, 인트린식과 어셈블코드 적용, 데이터 메모리 배치 최적화 과정을 H.264 부호화기 최적화의 입장에서, 비판적, 종합적으로 분석하고 반영한 결과를 소개한다. 특히, 대표적인 DSP인 TMS320DM64x를 사용하여 적용된 최적화 방식에 따른 연산이득을 구체적으로 제시하였으며, 그 결과 CIF급의 영상은 현재시장에 유통되는 DSP기반으로 실시간 구현이 가능함을 확인하였다.

• 한국미생물·생명공학회지
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• 제15권2호
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• pp.116-121
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• 1987

Enterobacter agglomerans의 질소고정유전자에 대한 연구가 보고된 바가 없으므로 이 질소고정유전자의 특성을 연구할 목적으로 국내 논의 흙에서 분리한 질소고정활성을 갖는 E. agglomerans NFB-264의 질소고정유전자를 cloning 하였다. E. agglomerans NFB-264의 total DNA를 Hind III로 절단하여 부분적으로 pBR 322에 연결하여 Escherichia coli K060에 도입한 후 negative selection 및 colony hybridization 방법으로 형질전환미생물을 선별하였다. 형질전환미생물로부터 recombinant plasmid인 pNEL10과 pNES20을 얻었다. pNEL 10은 nif Q-X probe DNA와 hybridization 되는 12Mdal의 삽입외래 DNA를 함유하였으며, pNES20은 nif NE와 nif YK probe DNA와 hybridization 되는 5 Mdal의 외래 DNA가 삽입되어 있었다.

• 농업과학연구
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• 제47권3호
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• pp.667-672
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• 2020

It is well known that intensive selection caused a decline in reproductive performance in dairy cattle. Interestingly, the reproductive performances including fertility and calving interval of Korean native beef cattle have declined in the last 20 years, suggesting that a breeding program focusing on carcass weight and intramuscular fat may affect the reproductive physiology in Korean native beef cattle, too. In this study, we analyzed the calving interval (CI) and selection index (SI) based on genome-wide association studies (GWAS) of Hanwoo cows for seven years (2013 - 2019). Multiparous cows (4.5 ± 0.11) were analyzed, which were bred by artificial insemination (AI). We first examined the distribution of the AIs and calving dates. About 40% of the AIs were carried out in May to June and October to December; subsequently, calving was observed from March to April and August to October, respectively, indicating the cows were seasonally bred. No correlation between CI and SI was found (y = 0.0459x - 17.64; R² = 0.0356), but the ratio of cows with a positive SI was higher in the longer CI group compared to the shorter group, suggesting that the selection for meat quality and quantity may affect the reproductive performances. In addition, the average value of SI was - 3.42 in the CI < 400 while + 5.79 in the CI > 400 although the values were not statistically significant. However, our results suggest that reproductive indices such as fertility and CI should be considered for sustainability in the Hanwoo breeding selection program.

• Journal of the Korean Statistical Society
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• 제30권1호
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• pp.163-178
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• 2001

We consider the experimental design problem of selecting values of design variables x for observation of a response y that depends on x and on model parameters $\theta$. The form of the dependence may be quite general, including all linear and nonlinear modeling situations. The goal of the design selection is to efficiently estimate functions of $\theta$. Three new criteria for selecting design points x are presented. The criteria generalized the usual Bayesian optimal design criteria to situations n which the prior distribution for $\theta$ amy be uncertain. We assume that there are several possible prior distributions,. The new criteria are applied to the nonlinear problem of designing to estimate the turning point of a quadratic equation. We give both analytic and computational results illustrating the robustness of the optimal designs based on the new criteria.

• 한국연초학회지
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• 제6권2호
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• pp.179-184
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• 1984

This experiment was carried out to select the suitable burley varieties for paddy field. Two varieties, two $F_1$ hybrids and three $F_1$ hybrids with pale yellow line which were all early maturing were tested in the paddy field condition. The results were as follows. 1. Va 528 and all $F_1$ hybrids flowered 4-8 days earlier than Burley 21. 2. Leaf maturity among varieties and $F_1$ hybrids were not significantly different at first priming, but significant differences were detected from second to forth primings. (MS Ky 12x JB 7802-30)Fl and (MS Br 21 x L8)$F_1$ hybrids matured 3-5 days earlier than Burley 21. Pale yellow hyorids matured early, yielded high and were favorable in physical properties, but were low in quality. 4. Va 528 and (MS Br 21 x L8) $F_1$ hybrid showed earthy maturing, high yield and good quality compared with Burley 21. So two varieties were considered suitable for paddy field cultivation.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 가을 학술발표회 논문집
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• pp.168-175
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• 1999

The previous study was an expert system development that help engineers select proper foundation types and construction methods for structures under various subsoil condition. The system includes geographical and geological data in certain areas of Ulsan and a knowledge base for the selection of foundation types. However, the system, a kind of application program, has a weakness that it can be used only when it is installed at each user's own computer. Therefore, the purpose of the research is to more the system operated on Internet and spread over to more users. So, Server Installation, ActiveX, ADO(Active Data Objects) and ASP(Active Server Pages), which are the requirements to operate the system on Internet, are to be investigated through the research.

• 한국산학기술학회논문지
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• 제14권12호
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• pp.6204-6210
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• 2013

본 연구는 파트너선정에 적합한 결정기준의 제안과 파트너 선정요인이 제휴성과에 미치는 영향 관계를 국내기업 관점에서 신뢰도와 몰입도 그리고 제휴경험 등의 요인별 영향을 분석하였다. 분석결과 제휴체결 당시 과업관련 선정기준을 중심으로 파트너를 선정하는 성향과 파트너관련 선정기준을 적용하는 성향의 기업들에 있어 별다른 차이점 없이 신뢰형성과 제휴몰입도에 긍정적인 영향을 주고 있는 것으로 나타났으나 파트너 관련 선정기준을 적용하는 기업의 경우 제휴몰입도와의 상관관계가 없는 것으로 나타났다 (CR=1.065). 또한 기존의 제휴경험이 파트너 기업 간 신뢰도와 제휴몰입도를 높일 것이라는 예상과 다르게 경험 유무가 별다른 차이를 보여주지 않았고 오히려 과업관련 선정기준으로 파트너를 선정한 기업의 경우 제휴경험이 없을수록 신뢰도 형성에 긍정적인 것으로 나타났다 ($x_2{^2}-x_1{^2}=5.452$). 본 연구는 제휴를 도입하려는 국내기업이 제휴파트너를 선택하는 과정에서 국내기업의 환경에 적합한 선정 기준을 제안하고 기업의 이해 폭을 넓히며 파트너 선정기준의 결정요인들과 신뢰와 몰입 등 관계자원의 영향을 통합적으로 분석하고 성공적 제휴관계 형성과 성과를 위한 파트너 선정의 중요성을 강조함으로서 이론적 실무적 시사점을 제시하고 있다.

• 천문학회보
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• 제41권2호
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• pp.64.2-64.2
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• 2016

Optical variability is one way to probe the nature of the central engine of AGN at smaller linear scales and previous studies have shown that optical variability is more prevalent at longer timescales and at shorter wavelengths. Especially, intra-night variability can be explained through the damped random walk model but small samples and inhomogeneous data have made constraining this model hard. To understand the properties and physical mechanism of optical variability, we are performing the KMTNet Active Nuclei Variability Survey (KANVaS). Test data of KMTNet in the COSMOS field was obtained over 2 separate nights during 2015, in B, V, R, and I bands. Each night was composed of 5 and 9 epochs with ~30 min cadence. To find AGN in the COSMOS field, we applied multi-wavelength selection methods. Different selection methods means we are looking different region in unification model of AGN, and 100~120, 400~500, 50~100 number of AGN are detected in X-ray, mid-infrared, and radio selection of AGN, respectively. We performed image convolution to reflect seeing fluctuation, then differential photometry between the selected AGN and nearby stars to achieve photometric uncertainty ~0.01mag. We employed one of the standard time-series analysis tools to identify variable AGN, chi-square test. Preliminarily results indicate that intra-night variability is found for X-ray selected, Type1 AGN are 23.6%, 26.4%, 21.3% and 20.7% in the B, V, R, and I band, respectively. The majority of the identified variable AGN are classified as Type 1 AGN, with only a handful of Type 2 AGN showing evidence for variability. The work done so far confirms that there are type and wavelength dependence of intra-night optical variability of AGN.