• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1996년도 가을 학술발표회 논문집
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• pp.373-378
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• 1996

This paper presents the characteristics of various strengths of underwater non-segregation concrete. Three types of cements including low-heat cements has been used to make the test specimens for compressive strength, modulus of rupture and bond strength. The test specimens have been made both in ambient and underwater conditions to take into account the variation according to the environmental condition.

• 대한예방의학회:학술대회논문집
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• 대한예방의학회 2000년도 제52차 추계학술대회 연제집
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• pp.278-279
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• 2000

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.75-76
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• 2019

The purpose of this study is to achieving a sufficient fluidity without segregation for normal strength grade concrete mixture. therefore in this research, by analyzing the various superplasticizer dosages on the concrete mixture, the segregation range was analyzed to provide a proper concrete mix design with sufficient fluidity.

• 한국지역지리학회지
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• 제18권1호
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• pp.71-85
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• 2012

결혼이주자는 외국인 근로자나 유학생보다 지역사회에 미치는 영향이 크고 그 영향은 결혼이주자들의 자녀로 인해 계속 증가하게 될 것이므로 중요한 지역연구 대상이다. 그러므로 본 연구는 결혼이주자들의 차별적인 거주지 형성을 가져오는 근본적인 원인을 알아보고자 한다. 외국인 근로자나 유학생의 경우 처음에는 주거지 선택과정이 외생적 비자발적으로 이루어졌을지라도 점차 이주의 시간이 흐름에 따라 자생적 자발적으로 거주지 선택하는 방향으로 변화하는 반면에, 결혼이주자들의 주거지 분리과정은 자발적인 선택이 거의 어려운 상황에서 이주할 뿐만 아니라 이주 후에도 주거지 변동 혹은 선택이 자유롭지 못한 것이 특징이다. 그러므로 결혼이주자들의 차별적 주거지 분리패턴에 영향을 주는 요인들을 지역사회가 선택한 결혼이주자들의 민족적 배경과 관련지어 설명하고자 한다. 국적별 결혼 이주자의 주거지 분포 경향과 분리정도를 고찰한 후 베트남계와 필리핀계 결혼이주여성의 분포패턴을 중심으로 그 민족적 배경과 집중 분포지역의 관계를 알아보고자 한다.

• 한국결정성장학회지
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• 제18권5호
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• pp.195-199
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• 2008

반도체용 규소 원료는 11 N급의 고순도이나 가격이 고가이고 또한 생산이 제한되어서 폭발적인 태양전지의 수요를 따르지 못하고 있어 저급(5$\sim$6 N)의 UMG(Upgraded Metallurgical Grade)를 사용하자 하는 노력이 진행 중이다. 이 5$\sim$6 N급에서는 dopant 원소인 붕소(B)외 인(P)의 농도가 1 ppm 이상 존재한다. 이들 원료를 사용하여서 결정 성장을 하였을 경우에 존재하는 여러 불순물들의 편석계수(segregation coefficient)를 활용하여 화학적, 전기적 성질을 예상 하여본 결과 결정성장 초기에는 붕소(B)의 농도가 인(P) 보다 높아 p영역이 발생하고 후반부에는 인의 농도가 붕소 보다 높아 n 형 기판이 생성됨을 보았다. 또한 응고속도를 조절하여 여러 불순물을 제거하고자 히는 노력은 편식계수가 적은 금속 일소들의 제거에는 효과적이나 편석계수가 큰 붕소와 인의 제거에는 효과가 크지 않음을 예상 할 수 있다.

• 미생물학회지
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• 제20권1호
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• pp.11-20
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• 1982

A study was undertaken to examine the effect of curing agents on the stability, curing and segregation of R plasmid pSL100. And also the stability, transfer frequency, and recombination of its segregants obtained from curing agent treatment were studied. Ethidium bromide, acridine orange, and mitomycin-C were used as curing agent. The results obtained were as follows ; 1. The curing agent ethidium bromide, acridine orange, and mitomycin-C were not effective for curing the multiple antibiotic resistant determinant of pSL100 in Salmonella typhimurium and Escherichia coli. However, they induced plasmid segregation with high frequency in S.typhimuruim LT-2strains. TcApSmCm, TcSmCmKm, TcApCm, TcAp, TcKm, Tc segregants were obtained. 2. The resistant markers of the segregents were transferred to S.typhimurium LT-2 strains with high frequencies whereas they were transferred to E.coli K-12 only with low frequencies. 3. The transconjugants obtained from conjugation between two different S.typhimurium segregants were similar to the phenotype of the original R factor pSL100 and the resistant markers were transferred to the S.typhimurium LT-2 or E.coli strain with equal frequencies, indicating that they are recombinants. 4. The transconjugants obtained from conjugation between pSL100 segrgants and pKM101, or pBR322 possessed the resistant markers of the two parental plasmids and they were transferred to both S.typhimurium and E.coli K-12 strains with the same frequencies and maintained stably, suggesting that they are also recombinants. 5. The recombinant pSL100 could be also obtained in rec A-strains of E.coli, suggesting that the gene function of rec A is required for the recombination of pSL100 segregants in E.coli.

• 대한지리학회지
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• 제42권5호
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• pp.675-690
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• 2007

20세기 초반 하와이와 호놀룰루의 민족집단 관계는 백인이 수적으로 소수집단을 구성하는 예외적인 상황이기에 인종차별주의 관념에 별로 영향을 받지 않았었다는 것이 일반적인 견해이다. 하지만 실제로 과거는 물론이고 현재에 이르기까지 민족집단 관계에 인종, 민족 이슈들이 큰 영향을 미쳤음은 분명하다. 이 연구는 20세기 초반 호놀룰루 유색 이민집단들의 이주와 정착 과정 내내 백인지상주의 관념이 미국 본토에서와 마찬가지로 큰 영향을 미쳤음을 밝히고 있다. 직업의 차별화와 계층화, 그리고 거주지의 공간적 분화가 미국 본토의 도시에서와 같이 호놀룰루에서도 인종, 민족집단 간에 분명하게 이루어졌었다. 유색인종집단의 직업에 따른 사회적 분리 현상과 거주의 공간적 집중화 현상은 비백인집단의 "로우컬"과 백인집단의 "하올리"라고 하는 이원화된 대립적 정체성을 만들어가는 계기가 되었다. 그러한 변형된 정체성은 비백인들로 구성된 다민족적 근린지구 내에 착근된 민족집단들의 상호 협상과정이 지속적으로 진행되면서 자연스럽게 창출된 결과물인 것이다.

• Asian-Australasian Journal of Animal Sciences
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• 제24권3호
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• pp.330-335
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• 2011

The mode of inheritance of total milk yield and its genetic parameters were investigated in Churra dairy sheep through segregation analyses using a Monte Carlo Markov Chains (MCMC) method. Data which consisted of 7,126 lactations belonging to 5,154 ewes were collected between 1999 and 2002 from 15 Spanish Churra dairy flocks. A postulated major gene was assumed to be additive and priors used for variance components were uniform. Based on 50 000 Gibbs samples from ten replicates chains of 100,000 cycles, the estimated marginal posterior means${\pm}$posterior standard deviations of variance components of milk yield were $23.17{\pm}18.42$, $65.20{\pm}25.05$, $120.40{\pm}42.12$ and $420.83{\pm}40.26$ for major gene variance ($\sigma_G^2$), polygenic variance ($\sigma_u^2$), permanent environmental variance ($\sigma_{pe}^2$) and error variance ($\sigma_e^2$), respectively. The results of this study showed the postulated major locus was not significant, and the 95% highest posterior density regions ($HPDs_{95%}$) of most major gene parameters included 0, and particularly for the major gene variance. The estimated transmission probabilities for the 95% highest posterior density regions ($HPDs_{95%}$) were overlapped. These results indicated that segregation of a major gene was unlikely and that the mode of inheritance of total milk yield in Churra dairy sheep is purely polygenic. Based on 50,000 Gibbs samples from ten replicates chains of 100,000 cycles, the estimated polygenic heritability and repeatability were $h^2=0.20{\pm}0.05$ and r=$0.34{\pm}0.06$, respectively.

• Journal of Crop Science and Biotechnology
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• 제10권3호
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• pp.175-184
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• 2007

Two subspecies, japonica and indica, have been reported in rice, which differ in several ecotypic traits. However, reproductive barriers in hybrid progenies between subspecies have been major obstacles in breeding programs using inter-subspecific hybridization. As the first step to elucidate the reproductive barriers, we developed subspecies-specific(SS) STS markers in this study. A total of 765 STS primers were designed through comparing DNA sequences at every $2{\sim}3$cM interval between japonica and indica rices, which are available at Web DBs such as IRGSP, NCBI, TIGR, and GRAMENE, and tested for subspecies-specificity using 15 indica and 15 japonica varieties of diverse origin. Of them, 67 STS markers were identified as SS STS markers and their subspecies-specificity scores were estimated. The SS markers were dispersed throughout the genome along chromosomes. Of them, 64 SS markers were mapped on an RIL population derived from a Dasanbyeo(indica)/TR22183(japonica) cross. Genomic inclination of RILs was evaluated based on the genotyping with different types of markers. Association test between markers and segregation distortion revealed that segregation distortion might not be the cause of generating SS markers. The SS markers will be applicable to estimate the genomic inclination of varieties or lines and to study the differentiation of indica and japonica, and ultimately to breed true hybrid rice varieties in which desirable characters from both subspecies are recombined.

• 한국작물학회지
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• 제56권1호
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• pp.14-17
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• 2011

Dwarfuess and Kunitz trypsin inhibitor (KTI) protein in soybean is useful traits for basic studies. df2 and ti gene control dwarfness and the expression of Kunitz trypsin inhibitor (KTI) protein in soybean, respectively. The objective of this research was to verify genetic linkage or independent inheritance of df2 and ti loci in soybean. The $F_2$ population was made by cross combination between "Gaechuck#2" (Df2Df2titi genotype, KTI protein absence and a normal growth type) and T210 (df2df2TiTi genotype, a dwarf growth type and KTI protein present). A total of 258 $F_2$ seeds were analyzed for the segregation of KTI protein using SDS-PAGE. And so, 198 $F_2$ plants were recorded for the segregation of dwarfness. The segregation ratio of 3 : 1 for Ti locus (201 Ti_ : 57 titi) and Df2 locus (143 Df2_ : 55 df2df2) was observed. Segregation ratio of 9 : 3 : 3 : 1 (116 Ti_Df2_: 44 Ti_df2df2: 27 titiDf2_: 11 titidf2df2) between df2 gene and ti gene was observed ($x^2$=3.53, P = 0.223). These results showed that df2 gene was inherited independently with the ti gene in soybean.