• Korean Journal of Plant Taxonomy
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• v.48 no.1
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• pp.1-8
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• 2018

Mankyua chejuense is the only member of the monotypic genus Mankyua (Ophioglossaceae) and is endemic to Jejudo Island, Korea. To determine the precise phylogenetic position of M. chejuense, two cpDNA regions of 42 accessions representing major members of lycophytes are obtained from GenBank and analyzed using three phylogenetic analyses (maximum parsimony, maximum likelihood, and Bayesian inference). In addition, the divergence time is estimated based on a relaxed molecular clock using four fossil calibration points. The phylogenetic position of Mankyua still appears to be uncertain, representing either the earliest diverged lineage within Ophioglossaceae or a sister to the clade containing Ophioglossum and Helminthostachys. The most recent common ancestor of Ophioglossaceae and its sister lineage, Psilotum, was estimated to be 256 Ma, while the earliest divergence of Mankyua was estimated to be 195 Ma in the early Jurassic.

• Bioinformatics and Biosystems
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• v.2 no.1
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• pp.7-11
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• 2007

Methods for making scoring matrix based on phylogenetic tree for all possible exchanges of one amino acid with another. PFMT(Phylogenetic focused Mutation Tendency) matrix is different BLOSUM62 and PAM160 which are the most used scoring matrixes. This matrix calculates possibility of substitution from common ancestor to high spices. PFMT matrix scores substitution frequency in COGs databases which contain 152 KOGs's dataset. PFMT matrix usefully is able to compare between query sequence and sequences of more higher species and show detailed substitution relation of 20 amino acids.

• Fisheries and Aquatic Sciences
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• v.11 no.3
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• pp.177-181
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• 2008

Glyceraldehyde 3-phosphate dehydrogenase(GAPDH) is a key enzyme for carbohydrate metabolism in most living organisms. Recent reports and our own searches of teleost species in publicly available genomic databases have identified at least two distinct GAPDH genes in a given species. The two GAPDH genes are located on the same chromosome in teleosts, whereas they are located on the different chromosomes in mammals. Thus, we reconstructed a phylogenetic tree to better understand the evolutionary history of the GAPDH genes in the vertebrate lineage. Our phylogenetic analysis revealed unambiguously that the two GAPDH genes of teleosts are phylogenetically closely affiliated to one of the cytosolic GAPDH and spermatogenic GAPDH-S of mammals. This indicates that the two paralogous GAPDH genes shared a common ancestor and subsequently underwent a gene duplication event during early vertebrate evolution. However, GAPDH-S of teleosts showed significant differences in the polypeptide residues and tissue distribution of its mRNA transcripts from that of mammals, implying they have undergone a different history of functionalization.

• Journal of the Korean Home Economics Association
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• v.24 no.3
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• pp.143-153
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• 1986

This study is intended to develop a scale to measure familism. Construction of this scale is based on a sample of 448 married males and females living in Seoul. This scale to measure familism is developed by employing a type of item analysis method called correlation analysis. 13 items are selected by correlation analysis, and these are found statistically significant even by analysis based on the criterion of internal consistency. Validity of this scale is evidenced by logical validation, jury opinion and independent criteria. Reliability estimate assessed by Cronbach's alpha coefficients is .759. This scale comprises the following 4 aspects of familism: 1) Support for filial piety and ancestor worship. 2) Integration of individual activities into family ones for achievement of family objectives. 3) Obligation to support individual family members and give them financial assistance when needed, on the assumption that properties such as land, money, etc. belong to family. 4) Mutual aid in psychological and social aspects between parents and married children, and married children and their married siblings. It is concluded that this familism scale represents an improvement on other measure of familism, but that a number of methodological issues remain to be further studied.

• Korean Journal of Human Ecology
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• v.20 no.5
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• pp.885-896
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• 2011

This research is intended to examine adult children's experiences with parental bereavement and the effect of the experiences on family relationships and their lives. In order to describe the subjects' experiences as they are and understand their meaning and essence, data was analyzed using the Colaizzi method, an approach to phenomenology as a qualitative research methods. The findings showed that subjects suffered from the loss of parents; however, they recovered from their conditions after an ancestor worshiping service. In addition, they took heavy responsibility for a survived parent after bereavement and experienced changes in the roles of family members. In conclusion, experience with parental bereavement caused adult children to reflect on themselves, to discuss the essence of life, and to change the attitudes of their life from a future-oriented perspective to a here-and-now perspective.

• Journal of Families and Better Life
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• v.17 no.4
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• pp.15-30
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• 1999

This paper aims to accomplish the work of finding and recreating factors of evelasting wedding view through studying literatures($\ulcorner$Ka-ryae$\lrcorner$.$\ulcorner$Ka-ryae-jip-ram$\lrcorner$.$\ulcorner$Sa-ryae-pyun-ram$\lrcorner$) of customary proprieties of a family The results of this study are as follows: The norm and meanings of wedding by way of education appear self-cultivation sincerity and carefulness ancestor worship morality of husband and wife filial duty to parents and parents-in-law rank and order simplicity. From this study on wedding view the efforts to accomlish the work of finding and recreating the factors everlasting inheriting value which would not be changed by social changes have to be made from now on.

• Genomics & Informatics
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• v.7 no.1
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• pp.26-31
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• 2009

Heat shock proteins are a class of molecular chaperones that can be found in nearly all organisms from Bacteria, Archaea and Eukarya domains. Heat shock proteins experience increased transcription during periods of heat induced osmotic stress and are involved in protein disaggregation and refolding as part of a cell's danger signaling cascade. Heat shock protein, Hsp20 is a small molecular chaperone that is approximately 20kDa in weight and is hypothesized to prevent aggregation and denaturation. Hsp20 can be found in several strains of Proteobacteria, which comprises the largest phyla of the Bacteria domain and also contains several medically significant bacterial strains. Genomic analyses were performed to determine a common evolutionary pattern among Hsp20 sequences in Proteobacteria. It was found that Hsp20 shared a common ancestor within and among the five subclasses of Proteobacteria. This is readily apparent from the amount of sequence similarities within and between Hsp20 protein sequences as well as phylogenetic analysis of sequences from proteobacterial and non-proteobacterial species.

• The Korean Journal of Malacology
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• v.9 no.2
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• pp.57-67
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• 1993

A cladistic analysis for phylogenetic relationship among 3 freshwater planorbid snail species was carried out on the basis of their conchological and anatomical characteristics.The intestinal loop in the digestive systims was mainly distinguishable among 3 species of the planorbid snails. The loops in Hippeutis cantori and Segmentina hemisphaerula coiled around stomach, extended down to the distal part of the liver and finally connected with the anus, while the loop in Gyraulus convexiusculus was short and small, and connected directly to the anus after coiling around the stomach. However, the intestinal loop of Hippeutis cantori was the largest among those of 3 target snail species. In the main morpholohical differences of the riproductive systems, Gyraulus convexiusculus uniquely had a calcareous stylet in the penis sheath. Although there was no stylet in the penis sheath in the other snail species, the penis shesths connected with 1 and 2 flagella in Segmentina hemisphaerula and in Hippeutis cantori, respectively were different from each other. Two planorbid species, Hippeutis cantori and Segmintina hemisphaerula have a more recent phylogenetic ancestor out three species employed including Gyraulus convexiusculus.

• 보존과학연구
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• s.28
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• pp.75-90
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• 2007

The ancient biomolecular remains are the potential source for paleobiology and paleoanthropology. Especially, ancient human specimens such as bone, teeth, and hair are powerful materials to identify historical origin and migration of ancestor population from the past. However, most excavated human specimens in archaeological sites have commonly problems as natural damage and exogenous contamination. We carried out histological and molecular analyses of excavated bone from the historic sites in South Korea from the recently discovered in tumulus of Seochun and Naju. Biological deterioration of bone was observed anatomically by optical and scanning electron microscope (SEM). We extracted degraded DNA, and amplified hyper variable region (HVR) of mitochondrial DNA (mtDNA) and amelogenin of nucleus DNA. This study applied and examined the relationships between histological preservation and DNA survival in excavated bone.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.52-54
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• 2005

XML이 웹 정보 시스템의 데이터베이스로 활용되면서 공유 부분에 대한 데이터 처리의 높은 효율성을 제공하고자 최소 단위의 접근제어 모델에 대한 연구가 판독 모드 측면에서 활발히 진행되었다. 질의 처리 연구에서는 XML 데이터베이스에 대한 갱신 질의 표준화 작업이 진행되고 있다. 본 논문은 갱신 질의 연산을 최소 단위 접근제어 모델의 연산 모드로 추가함으로써 발생하는 보이지 않는 조상 문제를 정의한다. 이를 해결하기 위한 고려 사항으로 보이지 않는 조상 노드들을 포함하는 XML 문서에 대한 갱신 연산 시 고려해야 할 특성을 갱신의 비밀성, 갱신의 무결성, 그리고 갱신의 일관성으로 정의하고 갱신 연산 수행 시 발생될 수 있는 특성 위배 상황을 정리한다.