• Korean Journal of Plant Taxonomy
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• v.42 no.1
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• pp.1-12
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• 2012

To clarify the morphological variations of Galium, its morphological characteristics were examined using maximum parsimony analysis. The key characteristics as well as the range of variation in each characteristic were investigated at the species level and were employed to elucidate the relationships between the taxa. This study confirmed that species belonging to genus Galium formed a monophyletic group and comprised two main clades. Sect. Cymogaliae and sect. Leptogalium are polyphyly groups, and other sections are monophyletic group. This study also suggests that the fruit hairs, the types of petal apexes, and the colors of the petals are the most valuable taxonomic characteristics for differentiating different sections. The numbers of the leaves and leaf shape provide useful taxonomic characteristics for the identification of different species.

• Proceedings of the Zoological Society Korea Conference
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• 1995.10b
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• pp.139.2-139
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• 1995

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1993.10a
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• pp.177-183
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• 1993

본 연구에서는 범용 구조 해석 패키지인 MSC/NASTRAN을 이용하여 대형 구조물인 안테나 각 분계의 동특성을 파악하고, 부분구조합성법을 이용하여 구조물 전체의 동특성을 파악하였다. 또한 구조물의 주파수 응답 함수를 이 용하여 지배적인 고유모드를 구하였고, 각 분계의 변형 및 운동 에너지를 산 출하여 전체 고유모드에 대한 분계의 에너지 기여도 파악하였으며, 이와 같 은 진동 요인 분석에 따른 진동 대책으로, 변형 및 운동 에너지 기여도가 높 은 분계의 질량 및 강성 변경에 따른 구조물의 동특성 변화를 예측함으로 구조물의 동특성 개선의 방향을 제시하였다.

• Korean Journal of Plant Resources
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• v.19 no.5
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• pp.628-633
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• 2006

ITS DNA sequences from five individuals, representative of five groups designated according to the degree of leaf teeth and lobes from simple to palmate compound leaf in the Viola albida complex, established and further analysed in order to solve the taxonomic difficulty. A total 702 bp was sequenced at the 5.8S ribosomal DNA and internal transcribed spacer 1 and 2. The 5.8S coding region is 163 bp, and has no sequence variations. The ITS1 and ITS2 noncoding regions have a little bit sequence variations, and those were further analysed by the methods of the analysis of variance (ANOVA), the analysis of sequence divergence and the phylogenetic analysis. The result of ANOVA showed no significant differences among individuals investigated. The analysis of sequence divergence with Kimura 2-parameter distance revealed that in-groups showed much less than 0.05 in absolute value among individuals, while two out groups more than 0.05, V. grypoceras and V. orientalis. This result appeared that the sequence divergence among in-groups was not yet occurred in the species level but situated at somewhere below the species level. In the phylogenetic analysis, two outgroups formed the basal clades in order. Five individuals in-groups formed a clade. The clade was, however, not very robust as around 50% in bootstrap value, suggesting that this result was not meaningful in the phylogenetic point of views.

• Journal of the Korean Institute of Gas
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• v.14 no.5
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• pp.32-37
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• 2010

In this study, vapor-liquid equilibrium (VLE) data at several isothermal temperatures for carbon dioxide and ethane binary systems were estimated using binary interaction parameters (BIP's) in Peng-Robinson (PR) equation of state built-in PRO/II with PROVISION (PRO/II) process simulator. Moreover, BIP's in PR equation of state were newly determined by regressing the experimental VLE data for carbon dioxide and ethane systems for each different isothermal temperatures using the summation of squares of the bubble point deviations as an objective function. Comparative works have been performed for absolute average deviation % (AAD(%)) between experimental and predicted bubble pressures using built-in BIP's in PRO/II and newly regressed one, respectively. Our calculation results gave a better estimation result than the simulation result using an existing parameter built-in PRO/II.

• Journal of Ocean Engineering and Technology
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• v.13 no.4 s.35
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• pp.10-18
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• 1999

본 논문에서는 대형구조물의 해석에 있어서 부분구조합성법과 섭동법을 이용하여 복잡한 비선형시스템의 해석방법을 제안하였다. 해석방법은 전체시스템을 먼저 몇 개의 분계로 분할한다. 각 분계의 운동방정식에 비선형항이 존재하여도 전체시스템의 지배적 진동모드는 선형모드라는 가정하에 이 시스템의 각 분계를 모드좌표로 변환한다. 이때, 비선형항은 근사적으로 변환한다. 그리고 섭동법을 이용하여 각 분계의 모드좌표방정식은 섭동좌수별로 정식화되어 순차적으로 구해진다. 비선형의 감도는 비선형계수로 정의되고, 그에 상응하는 강성에 의해 구해진다. 제안된 해석방법으로 비선형회전체, 비선형 베어링-페데스탈로 구성된 대형시계구조물의 진동을 해석하였다. 해석방법의 유효성을 평가하기 위해 응답의 정도와 계산소요시간을 유한요소법의 결과와 비교 분석하였다.

• Journal of Energy Engineering
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• v.25 no.4
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• pp.190-197
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• 2016

Flash point is the one of the important properties for the safe handling of inflammable liquid solution. In this paper, flash points of binary liquid solutions, water+1-propanol and water+2-propanol, were been measured by using Seta flash closed cup aparatus. Flash point was estimated using regression analysis method. Flash points were also estimated by the method based on Raoul's law and the method optimizing the binary parameters of van Laar equation. Experimental results were compared with the calculated results. The regression analysis method is able to estimate the flash point fairly well for water+1-propanol and water+2-propanol mixture.

• Korean Journal of Plant Taxonomy
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• v.45 no.2
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• pp.158-168
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• 2015

A study of the genus Pilea in Korea including five taxa was carried out using molecular phylogenetic methods. The majority of members of the genus Pilea in Korea are annual herbs, and they live in moist habitats, flowering in summer and fruiting in autumn. The results of a phylogenetic analysis using nrDNA and cpDNA supported the recognition of P. japonica, P. peploides, and P. taquetii. Pilea taquetii from Mt. Sanbangsan in Jeju was nested within P. hamaoi and P. mongolica clade instead of the P. taquetii clade, with P. taquetii from Mt. Jirisan also separated from the P. taquetii clade. This indicates that the separation is not geographical isolation, but is instead related to taxonomic problems. Therefore, further study of the P. taquetii group is necessary.

• Korean Journal of Plant Taxonomy
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• v.39 no.2
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• pp.89-99
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• 2009

We used Maximum parsimony and Neighbor-joining to investigate phylogenetic relationship of the genus Thalictrum in Korea with 39 morphological characters. The plant materials were used for ingroup 21 taxa and outgroup 1 taxon including a Korean endemic plant. This study confirmed that Sect. Thalictrum and Sect. Camptonotum formed monophyletic group by 100% and 83% bootstrap values respectively, and Sect. Camptonotum appeared to be Sect. Thalictrum's sister group. Sect. Erythrandra and Sect. Physocarpum formed paraphyletic groups. Sect. Physocarpum except T. osmorhizoides appeared to be polytomy. Sect. Tripterium and Sect. Omalophysa formed an independent clade. The shape of stamen is the important character representing the phylogenetic pattern of the genus Thalictrum; the bat and filiform types might be derived from clavate type. The pollination patterns (entomophily, anemophily), and presence of calyx at flowering time may also be related to the evolution of the Thalictrum flowers.

• Korean Journal of Plant Resources
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• v.29 no.4
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• pp.407-418
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• 2016

In this study, the phylogenetic relationship of Korean Hydrangea was evaluated by using sequenced three chloroplast regions and ITS region, including the 7 taxa. The result of phylogenetic analysis indicated that Korean Hydrangea, 7 taxa formed the monophyletic group. This analysis also revealed that subsect. Macrophyllae of Korea was separated into two groups; H. serrata f. acuminate and H. macrophylla group. The H. serrata f. acuminta group was included with H. serrata f. buergeri and H. serrata f. fertilis. These three species form a monophyletic clade, with no significant differences between their nucleotide sequences. The H. serrata f. acuminta group showed a monophyletic group with H. serrata f. buergeri and H. serrata f. fertilis and there is significant differences between their nucleotide sequences. H. macrophylla group was an independent clade distinguished by H. serrate f. acuminate group. Subsect. Petalanthe, Heteromallae and Calyptranthae form a monophyletic group. H. petiolaris which is located in Subsect. Calyptranthae was separated into two subgroups; First subgroup: Jeju island (except for Mt. Halla) and Second subgroup: Ulleung island and Japan. Additional studies of two subgroups of H. petiolaris should be conducted a geographical study and add more samples.