• Journal of the Korean Institute of Telematics and Electronics B
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• v.33B no.1
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• pp.116-127
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• 1996

In this paper, a scheme of classification of scaled textured images using normalized pattern spectrum incorporating arbitrary scale changes based on mathematical morphology is proposed in more general environments considering camera's zoom-in and zoom-out function. The normalized pattern spectrum means that firstly pattern spectrum is calculated and secondly interpolation is performed to incorporate scale changes according to scale change ratio in the same textured image class. Pattern spectrum is efficiently obtained by using both opening and closing, that is, we calculate pattern spectrum by opening method for pixels which have value more than threshold and calculate pattern spectrum by closing method for pixels which have value less than threshold. Also we compare classification accuracy between gray scale method and binary method. The proposed approach has the advantage of efficient information extraction, high accuracy, less computation, and parallel implementation. An important advantage of the proposed method is that it is possible to obtain high classification accuracy with only (1:1) scale images for training phase.

• Journal of Korea Water Resources Association
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• v.36 no.6
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• pp.999-1012
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• 2003

The objective of this study is to test the applicability of CN values suggested using land cover and treatment classification of satellite image. Applicability test is based on the comparison of observed effective rainfall and computed one. The 3 case study areas, where are the upstream of Gyeongan stage station, the upstream of Baekokpo stage station Pyungchang River basin, and the upstream of Koesan Dam, are selected to test the proposed CN values and the hydrologic and meteorologic data, Landsat-7 ETM of 2000, soil map of 1:50,000 are collected for the selected areas. The results show that the computed CN values for three study cases are 71, 63, 66, respectively, and the errors between observed and computed effective rainfall are within about 30%. It can be concluded that the proposed CN values from this study for land cover and treatment classification of satellite image not only provides more accurate results for the computation of effective rainfall, but also suggest the objective CN values and effective rainfall.

• Microbiology and Biotechnology Letters
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• v.20 no.3
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• pp.335-343
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• 1992

A Streptomyces strain No. 182-27, which produced amino acid antimetabolite, was isolated from soil. During the course of screening for new amino acid antimetabolites from the culture broths of Actinomycetes, we found that the strain produced a substance active against Gram-positive bacteria and its activity was reversed by L-Ieucine on the synthetic minimal agar medium in the culture broth. The morphological and cultural characteristics serve to identify the producing organism strain 182-27 as the Streptomyces, although the species of this strain should be resolved in further studies. Fermentation was carried out in the synthetic medium at $28^{\circ}C$ for 78 hours. The fermentation yield reached about 2 mg per liter of the broth. Purification was done by ion exchange resin, active carbon, silica gel column chromatography and obtained 20 mg of pure active substance from the 20 $\ell$ culture broth. The 182-27 substance was obtained as white powder, mp 18SoC. From the physicochemical characteristics of the substance, it was amino acid like substance but unknown about its chemical structure. It is active against some Gram-positive bacteria and reversed by L-Ieucine.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2010.10a
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• pp.5-5
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• 2010

제주지역에 분포하는 특산식물의 현황을 알아보기 위해 지난 2007년부터 2010년까지 현지조사를 실시하여 44과 75속 63종 17변종 13품종으로 총 93분류군에 대한 자생지 환경, 개체군 동태, 생육특성 및 위협요인 등에 대한 자료를 구축하였다. 이중 세계적으로 제주지역에만 분포하는 제주특산식물은 긴다람쥐꼬리(Huperzi integrifolium) 등 27과 46속 36종 12변종 8품종으로 총 56분류군으로 분석되었으며, 제주도를 포함하여 우리나라에만 분포하는 한국특산식물은 구상나무(Abies koreana) 등 20과 28속 24종 4변종 4품종으로 총 32분류군인 것으로 파악되었다. 그리고 조사대상 특산식물 중 바위좀고사리(Asplenium sarelii var. anogrammoides) 등 5분류군은 분류학적 검토와 함께 특산식물여부에 대한 검토가 필요한 것으로 판단되었다. 그리고 개나리(Forsythia koreana)는 조경용으로 식재된 종이므로 제주지역에 자생지가 확인된 특산식물은 39과 70속 59종 16변종 12품종으로 총 87분류군으로 볼 수 있다. 제주지역의 특산식물은 해안지대에서 확인된 갯겨이삭(Puccinellia coreensis)부터 한라산 정상에서 자라는 한라솜다리(Leontopodium hallaisanense)까지 제주도 전역 분포하고 있으나 종에 따라 서로 다른 분포특성을 보였다. 특히, 한라산 해발 1,400m 이상 아고산대에 집중 분포하는 특성을 보였다. 특산식물의 자생지내 개체군의 동태를 보면 대부분의 식물이 개체수 및 분포범위가 한정되어 있는 것으로 나타났다. 더욱이 지리산오갈피(Eleutherococcus divaricatus var. chiisanensis)는 2개체만이 확인되어 종보전이 시급한 것으로 조사되었고, 한라솜다리, 모데미풀(Megaleranthis saniculifolia), 한라각시둥굴레(Polygonatum humile var. humillimum) 등 상당수의 식물 종이 수십 개체 이내로 매우 적은 개체수를 유지하고 있었다. 제주지역에 분포하는 특산식물은 인위적 또는 자연적 요인으로 인해 많은 자생지 면적감소나 개체수 감소 등의 위협요인을 갖고 있는 것으로 나타났다. 특히, 중산간 이하에 자라는 특산식물은 접근성 등이 용이하여 도채 등의 위험성이 높은 것으로 판단된다. 그리고 한라산국립공원 내에 분포하는 특산식물은 인위적 훼손 위험성은 상대적으로 낮은 편이나 자연적 요인 즉, 식생변화 등으로 인해 자생지 및 개체수 감소가 이루어질 것으로 보여 체계적인 종 보존전략이 마련되어야 할 것으로 판단된다. 한편, 제주지역 특산식물 중 자생지가 확인된 식물 종을 대상으로 근연종 분석 등을 통해 유용성을 분석하면 식물체 일부가 약용으로 가능한 식물 종이 개족도리(Asarum maculatum) 등 전체의 67.1%를 차지하였고, 관상용으로 활용가치가 높은 식물 종은 구상나무(Abies koreana) 등 전체의 60.2%인 것으로 분석되었으나 대부분의 종이 희소성의 가치가 있어 모든 특산식물이 관상용으로 이용가치가 있는 것으로 판단되었다. 제주지역에서 확인된 특산식물 중 전체적으로 90.9%가 유용성이 있는 것으로 나타나고 있으며 아직까지 유용성에 대한 정보가 미흡한 종도 자원적인 연구접근에 따라 다양한 자원으로 활용가치가 있는 것으로 판단된다.

• Korean Journal of Plant Resources
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• v.25 no.4
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• pp.490-497
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• 2012

Phylogenetic analyses were conducted to evaluate relationships of 5 taxa of Korean Hydrocotyle, H. spp. found in the Ulleung island including one outgroup (Centella asiatica). The molecular phylogenetic methods based on nuclear ribosomal DNA ITS region and cpDNA trnH-psbA region. Centella asiatica was used outgroup for analysis. As the result, genus Korean Hydrocotyle were grouped by 94% bootstrap value. Korean Hydrocotyle was grouped by four clades; Clade I-H. maritima, H. sibthorpides and H. yabei clade Clade II-H. nepalensis clade clade III-H. ramiflora clade clade IV-H. spp. clade. H. maritima, H. sibthorpides and H. yabei was not distinguished, seperately. H. spp. was distinctly distinguished other Korean Hydrocotyle.

• Journal of Educational Research in Mathematics
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• v.27 no.3
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• pp.431-449
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• 2017

Acute triangles and obtuse triangles are defined according to the classification of triangles by angles. The definitions of acute triangles and obtuse triangles are difficult for students because they are related to different logical elements. The purpose of this study is to seek desirable methods for teaching the classification of triangles by angles related to logic. To do this, based on the theoretical consideration and the longitudinal analysis of the elementary mathematics textbooks, some implications are found for teaching. And then the lesson was planned and applied to $4^{th}$ graders. After the lesson, we reviewed and analyzed their worksheets and test results for examining the effects by teaching methods. Based on the result, we discussed and made some didactical suggestions for teaching the classification of triangles by angles.

• Korean Journal of Ichthyology
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• v.36 no.2
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• pp.139-155
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• 2024

Using the cytb gene region of the mitochondrial DNA of eight populations of Sarcocheilichthys nigripinnis morii and five populations of S. variegatus wakiyae, which belong to the genus Sarcocheilichthys from Korea, the genetic diversity and molecular phylogenetic relationships of each population were examined. As a result of the analysis, it was confirmed that the S. variegatus wakiyae population had higher genetic diversity than the S. nigripinnis morii population. In the phylogenetic tree of genus Sarcocheilichthys fish in Korea based on the cytb gene, the Yeongsan River (YSR) population of S. variegatus wakiyae forms a clade with the Tamjin River (TJR), Yeongsan River (YSR), and Seomjin River (SJR) population of S. nigripinnis morii, and genetic relationships that do not align with the current classification system were observed. Meanwhile, on the nuclear DNA phylogenetic tree, S. variegatus wakiyae and S. nigripinnis morii could be clearly distinguished, showing mitonuclear inconsistency where mitochondrial and nuclear DNA conflicted on the phylogenetic tree. The Seomjin River (SJR) population of S. nigripinnis morii was translocated to the Dongjin River (DJR) population, haplotype from which crossbreeding was presumed to have occurred was confirmed. Among the rivers flowing into the East Sea, the S. nigripinnis morii population is known to have been introduced and inhabit only the Hyeongsan River (HSR), and it is presumed to be a population formed by translocation from the Han River (HR) population, with a haplotype representing a unique genetic group also confirmed. The Han River (HR), Geum River (GR), and Mangyeong River (MGR) populations of S. nigripinnis morii formed a genetically identical population with S. czerskii and S. soldatovi distributed north of the Yalu River, and accordingly, a taxonomic reexamination was required through morphological and molecular phylogenetic studies by securing various specimens.

• Korean Journal of Plant Taxonomy
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• v.31 no.3
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• pp.267-282
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• 2001

To examine the leaf epidermal microstructure of three genera (Scopolia s.s., Anisodus, AtroPanthe, including Przewalskia as an outgroup) in the genera Scopolia Jacq. s.l., leaves of 10 species (37 specimens) were investigated by the light microscopy (LM) and scanning electron microscopy (SEM). The stomata of studied taxa were 'amphistomatic type' and the size (guard cell) range was $18-64{\times}11-48{\mu}m$. The size of stomata is slightly differed from between the taxa; the smallest size of stomata were found in the monotypic genus, Przewalskia ($24-27{\times}16-17{\mu}m$), on the other hand the largest one was found in Anisodus carniolicoides ($62-64{\times}43-48{\mu}m$). The stomatal complex was mostly anomocytic (in Scopolia s.s., Anisodus taxa : A. luridus, A. carniolicoides, A. acutangulus) and sometimes anisocytic (in Anisodus tanguticus, Przewalskia, Atropanthe). The stomata is mostly crescent in shape, but rarely circular, especially in Przewalskia tangutica. The shapes of epidermal cells are similar in both adaxial and abaxial sides, and mostly undulate/sinuate polygonal anticlinal wall, but rarely arched in Przewalskia tangutica. The epicuticular wax was not well developed in most studied taxa, except Anisodus tanguticus which is well developed cuticular striae around the stomatal complex. The elongate-headed glandular trichomes were found in Scopolia s.s. and Przewalskia. While the taxa of Anisodus and Atropanthe have not any trichomes (i. e., glabrous), except Anisodus luridus, which has simple or sometimes branched (dendritic- type) non-glandular trichome. Finally, the systematic and ecological significance of the leaf micromorphological features (stomata complex, trichome, etc.) in identification and elucidation of Scopolia s.l. including Przewalskia, especially between or within the genera including among the species is also discussed.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.50 no.3
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• pp.212-220
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• 2005

One hundred eleven glutinous rice collections from seven countries were evaluated for genetic diversity based on agronomic traits and RAPD analysis. Twelve agronomic traits including yield components amy-lose content, alkali digest value were used to clarify the genetic relationships among glutinous rice collections. Glutinous rice collections were classified into 4 groups and early maturings Korean landraces and high amylose indica belonged to group I with RAPD analysis, 15 primers selected for polymorphic bands generated 117 bands and 81 bands $(69.2\%)$ showed polymorphism. The number of amplified bands per primer ranged from 5 to 11, with the average number of bands of 7.8. With the similarity value of 0.78 in dendrogram derived from the cluster analysis based on RAPDs, glutinous rice collections were classified into 9 groups. Seventy-seven percent of the collections were classified into group I that is the largest one, while the others $(23\%)$ were distributed to group Il-IX. Group I included most indica type rices and early ripening collections, while the small groups of III-IX included most of the Korean collections.

• Korean Journal of Plant Taxonomy
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• v.36 no.4
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• pp.263-277
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• 2006

Anemone pendulisepala, recently described as a new species, is distributed in sympatry with A. reflexa, A. amurensis, and A. raddeana at Mt. taebeark and Mt. Baekdu. Anemone pendulisepala was previously proposed to be a hybrid species between A. reflexa and A. amurensis becaue it displavs overlapping features with them in involucre shape, petiole length, sepal apex and xylem shape, To verify the taxonomic status and to examine the hybridity of A. pendulisepala, sequences of ITS region of nuclear ribosomal DNA and the psba-trnH, rps16 and trnLF region of cpDNA from 36 accessions of 5 taxa including outgroup were analyzed. In maximum parsimony tree based on ITS sequences, A. pendulisepala had the same sequences of A. reflexa and was clustered with monophyletic A. amurensis, and then A. raddeana. Anemone pendulisepala was distinguished from the other taxa by having four base insertion in rps16 region, two species-specific bases and insertion in trnLF region. In the phylogenetic trees of combined cpDNA, A. pendulisepala showed monophyly with the bootstrap 100%. Anemone pendulisepala exhibited no polymorphism and shared no sequences with putative parental or related taxa examined in this study. Molecular data suggest that A. pendulisepala should be a distinct species, and no evidence of the hybridization was detectcd.