• Animal Systematics, Evolution and Diversity
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• 제18권1호
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• pp.13-21
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• 2002

한국의 산양 (Naemorhedus caudatus)의 유전정보를 종보전에 활용하기 위하여, 한국의 2개 장소에서 채집한 6마리의 미토콘드리아 cytochrome b 유전자 염기서열(606 bp)의 양상을 조사하였다 상응하는 중국의 산양의 염기서열은 GenBank에서 얻어서 이용하였다. 한국의 산양의 4개 haplotype의 각각과 중국의 산양의 한 haplotype간의 nucleotide Tamura-Nei 거리는 0.0650부터 0.0803 가지의 변이를 보였으며, 산양은 소과 내에서 높은 수준의 염기서열 다양성을 나타냈다 한국의 산양에서, 양구표본의 3개 haplotype간의 거리는 0.0151부터 0.0185로, 양구집단의 유전자 다양성이 낮은 수준으로 감소되었음을 보여준다. 또한 양구의 3개 haplotype의 각각과 삼척의 한 haplotype간의 거리는 0.0343에서 0.0479였다. 지리적 거리의 멀어짐에 따르는 유전자 거리의 증가가 서식처 단절에 의해 야기되었다고 판단됨으로, 한국의 산양의 유전자 다양성의 감소를 막기 위한 여러 가지 보전 대책이 즉각적으로 수행되어야 할 것이다 산양의 분류학적 검토를 위하여 GenBank에 있는 히말라야산양 (N. goral)의 염기서열 (276 bp)도 이용하였으며, 산양은 히말라야산양과 뚜렷한 차이가 없었다. 산양과 히말라야 산양은 동종으로 판단할 수가 있지만, 두 종의 보다 많은 표본을 이용한 후속 연구가 필요하다

• 전자공학회논문지S
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• 제35S권2호
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• pp.10-21
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• 1998

In this paper, we analyze the anynchrous cellular hybrid DS/FH spread spectrum system with diversity on nonselective Nakagami fading channel. Binary Psk scheme is considered and random spreading code sequences and random hopping patterns are used. We compare the performance of system using hard-limiting correlation receiver with diversity and linear corrleation receiver in Nakagami fading channel. We compute the average bit error probabilities with/without diversity according to spreading code sequence and the number of hop-ping frequencies under the same handwith espansion, and analyze near-far effect. The results show that hard-limiting correlation receiver with diversity gives a good performance over severe fading channel.

• Journal of Plant Biology
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• 제27권1호
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• pp.25-32
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• 1984

A study on the dominance-diversity of forest vegetation in Mt. Seolag was conducted from May 1981 to Aug. 1983. Based on the field data, the dominance-diversity curves were for 16 sites including slopes and vallies. The curves are grouped in two types, lognormal distribution at the sites of mature vegetation and geometric series at the disturbed or rocky sites. It seems that the curves express the nature of their ecocline, by the hypotheses of some investigators, i.e. Random Niche hypothesis, Niche Pre-emption hypothesis, Lognormal distribution and Logarithmic series. The dominance concentration among the southern, northern and western slope, H'=1.282 at southern slope and H'=1.385 at western slope. Dominance-diversity curves of 16 sites showed Preston's lognormal distribution with small variations among them. It seems that the dominance diversity reflects the differences in the coenocline of their sites. The top 10 dominant species in species sequence of 113 tree species in whole the mountain, were noticed: Quercus mongolica, Pinus densiflora, Acer pseudo-siebold anum, Quercus serrata, Carpinus laxiflora, Styrax obassia, Fraxinus rhynchophylla, Tilia amurensis, Lindera obtusiloba and Abies holophylla in order.

• 한국정보과학회논문지:소프트웨어및응용
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• 제32권12호
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• pp.1217-1228
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• 2005

최근 들어 DNA 컴퓨팅이 활발하게 연구되면서, DNA 컴퓨팅에서 가장 기본적이고도 중요한 DNA 서열 디자인 문제가 부각되고 있다. 기존의 연구에서 DNA 서열 디자인 문제를 다중목적 최적화 문제로 정의하고, elitist non-dominated sorting genetic algorithm(NSGA-II)를 이용하여 성공적으로 DNA 서열을 디자인하였다. 그런데, NSGA-II는 계산속도가 느리다는 단점이 있어서, 이를 극복하기 위해 본 논문에서는 $\varepsilon$-다중목적함수 진화알고리즘(r-Multiobjective evolutionary algorithm, $\varepsilon$-MOEA)을 DNA 서열 디자인에 이용하였다. 우선, 두 알고리즘의 성능을 보다 자세히 비교하기 위해서 DTLZ2 벤치 마크 문제에 대해서 적용한 결과, 목적함수의 개수가 작은 경우에는 큰 차이가 없으나, 목적함수의 개수가 많을 경우에는 $\varepsilon$-MOEA가 NSGA-II에 대해서 최적해를 찾는 정도(Convergence)와 다양한 해를 찾는 정도 (diversity)에 있어서 각각 $70\%,\;73\%$ 향상된 성능을 보여주었고, 또한 최적해를 찾는 속도도 비약적으로 개선되었다. 이러한 결과를 바탕으로 기존의 DNA 서열 디자인 방법론으로 디자인된 DNA 서열들과 7-순환외판원 문제 해결에 필요한 DNA 서열을 NSGA-II와 $\varepsilon$-MOEA로 재디자인하였다. 대부분의 경우 $\varepsilon$-MOEA가 우수한 결과를 보였고, 특히 7-순환외판원 문제에 대해서 NSGA-II와 비교하여 convergence와 diversity의 측면에서 유사한 결과를 2배 이상 빨리 발견하였고, 동일한 계산 시간을 이용해서는 $22\%$ 정도 보다 다양하게 해를 발견하였으며, $92\%$ 우수한 최적해를 발견하는 것을 확인하였다.

• The Plant Pathology Journal
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• 제28권3호
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• pp.295-298
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• 2012

Genetic diversity among Pseudomonas syringae pv. morsprunorum isolates from Prunus mume in Korea and Japan was investigated by comparative sequence analysis of the 16S rRNA gene. The strains included 24 field isolates recovered from P. mume in Korea along with seven Japanese strains. Two strains isolated from P. salicina in Japan, one strain from P. avium in the United Kingdom, and the pathotype strain were also used for comparison with their 16S rRNA gene sequences. Nearly complete 16S rRNA gene sequences were sequenced in all 35 strains, and three sequence types, designated types I, II and III, were identified. Eleven strains consisting of five Korean isolates, five Japanese strains, and one strain from the United Kingdom belonged to type I, whereas the pathotype strain and another 19 Korean isolates belonged to type III. Another four Japanese strains belonged to type II. Type I showed 98.9% sequence homology with type III. Type I and II had only two heterogeneous bases. The 16S rRNA sequence types were correlated with the races of P. syringae pv. morsprunorum. Type I and II strains belonged to race 1, whereas type III isolates were included in race 2. Sequence analyses of the 16S rRNA gene from P. syringae pv. morsprunorum were useful in identifying the races and can further be used for epidemiological surveillance of this pathogen.

• Genomics & Informatics
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• 제20권3호
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• pp.35.1-35.9
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• 2022

Microsatellites or simple sequence repeats are motifs of 1 to 6 nucleotides in length present in both coding and non-coding regions of DNA. These are found widely distributed in the whole genome of prokaryotes, eukaryotes, bacteria, and viruses and are used as molecular markers in studying DNA variations, gene regulation, genetic diversity and evolutionary studies, etc. However, in vitro microsatellite identification proves to be time-consuming and expensive. Therefore, the present research has been focused on using an in-house built java pipeline to identify, analyse, design primers and find related statistics of perfect and compound microsatellites in the seven complete genome sequences of coronavirus, including the genome of coronavirus disease 2019, where the host is Homo sapiens. Based on search criteria among seven genomic sequences, it was revealed that the total number of perfect simple sequence repeats (SSRs) found to be in the range of 76 to 118 and compound SSRs from 01 to10, thus reflecting the low conversion of perfect simple sequence to compound repeats. Furthermore, the incidence of SSRs was insignificant but positively correlated with genome size (R² = 0.45, p > 0.05), with simple sequence repeats relative abundance (R² = 0.18, p > 0.05) and relative density (R² = 0.23, p > 0.05). Dinucleotide repeats were the most abundant in the coding region of the genome, followed by tri, mono, and tetra. This comparative study would help us understand the evolutionary relationship, genetic diversity, and hypervariability in minimal time and cost.

• 한국인터넷방송통신학회논문지
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• 제9권2호
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• pp.117-122
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• 2009

본 논문에서는 다중 안테나 (Multiple-Antenna)를 적용한 초광대역 무선통신 (UWB: Ultra Wide-Band) 시스템에서 이중 이진 터보 부호의 성능을 보인다. 본 논문에서는 PPM-TH (Pulse Position Modulation-Time Hopping) 방식과 PAM-DS (Pulse Amplitude Modulation-Direct Sequence) 방식의 UWB 시스템을 모두 고려하였으며, 다중 안테나 기술로 시공간 블록 부호 (STBC : Space Time Block Code) 송신 다이버시티와 수신 다이버시티 기술을 적용하였다. 그리고 이진 터보 부호에 비해서 부호어 사이의 최소 거리 (Minimum Distance)가 길어서 복호 성능이 좋으며 처리량 (Throughput)이 높아서 복호 처리 시간이 짧은 장점을 가지고 있는 이진 이중 터보 부호를 적용하였다. 본 논문의 결과는 UWB 시스템을 구현하는데 적용될 수 있다.

• 한국자원식물학회지
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• 제32권6호
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• pp.644-668
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• 2019

Dysphania ambrosioides (L.) Mosyakin & Clemants which belongs to Chenopodiaceae/Amaranthaceae sensu in APG system has been known as a useful plant in various fields as well as an invasive species spreading all over the world. To understand its phylogenetic relationship with neighbour species, we completed chloroplast genome of D. ambrosioides collected in Korea. Its length is 151,689 bp consisting of four sub-regions: 83,421 bp of large single copy (LSC) and 18,062 bp of small single copy (SSC) regions are separated by 25,103 bp of inverted repeat (IR) regions. 128 genes (84 protein-coding genes, eight rRNAs, and 36 tRNAs) were annotated. The overall GC content of the chloroplast genome is 36.9% and those in the LSC, SSC and IR regions are 34.9%, 30.3%, and 42.7%, respectively. Distribution of simple sequence repeats are similar to those of the other two Dysphania chloroplasts; however, different features can be utilized for population genetics. Nucleotide diversity of Dysphania chloroplast genomes 18 genes including two ribosomal RNAs contains high nucleotide diversity peaks, which may be genus or species-specific manner. Phylogenetic tree presents that D. ambrosioides occupied a basal position in genus Dysphania and phylogenetic relation of tribe level is presented clearly with complete chloroplast genomes.

• 한국통신학회논문지
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• 제31권7C호
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• pp.725-734
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• 2006

이 논문의 1부에 이어, 수신안테나 다양성을 쓰는 직접수열 부호분할 다중접속(direct-sequence code division multiple access: DS/CDMA) 시스템에서 의사잡음(pseudonoise: PN) 부호를 획득할 때 평균값(cell average: CA), 큰값(greatest of: GO), 작은값(smallest of: SO) 일정 오경보 확률(constant false alarm rate: CFAR) 처리기의 성능 특성을 비균질 (nonhomogeneous) 잡음 환경에서 얻고 견주어 본다. 균질 잡음 환경에서와는 다르게, 비균질 잡음 환경에서는 큰값 일정 오경보 확률 처리기가 가장 성능이 좋고, 평균값 일정 오경보 확률 처리기가 그 다음으로 성능이 좋다는 것을 볼 수 있다.

• Journal of Species Research
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• 제1권2호
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• pp.224-231
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• 2012

To assess the genetic diversity of Aconitum coreanum (Ranunculaceae) populations in Korea, we have amplified and sequenced eight organellar marker regions, and developed and analyzed microsatellite markers. No sequence variation was detected from the eight organellar markers. Ten microsatellites were developed using Next Generation Sequencing and two microsatellite markers, AK_CA03 and AK_CT07, were identified polymorphic and applied for 143 individuals of twelve A. coreanum populations. Four and five alleles were detected for the two microsatellite loci, respectively, and number of migrants ($N_m$) was estimated as 1.12586. Two microsatellite marker loci showed $F_{ST}$ of 0.205 and 0.275, respectively. The heterozygosity deficit, low level of among-population differentiation, small size of gene flow, and lack of sequence variation of the organellar markers suggest that A. coreanum is reproductively isolated from other Aconitum species and there has been continuous gene flow among the populations of A. coreanum or it has dispersed relatively recently after speciation. Though population pairwise $F_{ST}$'s presented significant geographic structure, further sampling and study will be necessary to confirm this.