• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.378-379
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• 2003

v. Martens(1905)은 국내 다슬기과 담수패류를 모두 1속 15종 및 3아종으로 기록하였다. 그 후 많은 학자들에 의하여 형태 및 분류에 대한 연구를 시도하여 근래에 이르러 한국산 다슬기과 담수패류는 3속 7종 및 1아종(Choi ＆. Yoon, 1997), 3속 6종 및 1아종(Kwon et al, 2001)으로 정리하고 있다. 다슬기과 패류는 서식지에 따른 형태 변이가 매우 심하고, 또한 v.Martens(1905)에 의하여 발표된 18종의 동종이명 정리에 대한 국내외 학자간의 견해 차이가 정리되어 있지 않아 현재까지도 정확한 종 동정과 분류가 난해한 분류군인다. (중략)

• Korean journal of applied entomology
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• v.27 no.3
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• pp.165-170
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• 1988

Taxonomical study on the Longidoridae from korea were undertaken at Kyungsangbuk-do. Three species belomging to two Longidoridae were identified. Xiphinema zulu, X. setatiae and Longidoridae sylphus were newly reported from Korea.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.656-659
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• 2004

최근 많은 연구에서, 동일한 영상그룹들로부터 추출된 저수준의 특징들을 이용해서 고수준의 정보를 분석한 뒤, 이를 이용해서 영상을 분류하는 방법들을 소개하고 있다. 이러한 연구는 CBIR의 인덱싱에서 저수준의 특징만을 사용할 때 발생하는 의미적인 차이(semantic gap)문제를 해결하여, 검색의 효율을 높일 수 있게 한다. 하지만 이들 연구는 대부분 전경(scenery)영상만을 대상으로 하고 있다. 한편 영상을 객체 단위로 다루는 것은 CBIR의 성능을 크게 향상 시킬 수 있는 요인이 된다. 왜냐하면 대부분의 사용자는 관심있는 객체가 포함된 영상을 검색하기 원하기 때문이다. 본 논문에서는 영상의 객체를 인공객체와 자연객체로 분류하는 방법을 제안한다. 인공객체의 경우 자연객체에 비해 상대적으로 직선형태의 에지가 많이 발견되며 객체를 구성하는 패턴이 규칙적이고 방향성을 가진다. 또한 인공객체는 자연객체에 비해 객체영역의 경계가 직선에 의한 단순한 형태로 나타난다. 이러한 특징들을 EDH(edge Direction Histogram)의 에너지, EDAS(Energy Difference of Adjacent Sector)와 가버 필터를 통해 추출하여 분류에 이용한다. 실험을 통하여 각 특징들을 개별적으로 사용해서 76%에서 84% 사이의 분류 정확성을 얻었으며, 제안한 머징 방법을 이용하여 최종적으로 약 90%의 정확성으로 분류하였다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.10a
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• pp.423-426
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• 2004

인트라넷에서는 증가하는 웹문서의 검색을 목적으로 웹 검색엔진의 도입이 활발히 진행 중이며 대부분 찾아야할 키워드를 알고 접근하는 검색엔진 형태이다. 그러나 사용자가 무엇을 찾아야 하는지 모르는 경우 웹문서 분류체계는 효율적인 방법을 제시할 수 있다. 일부 구축되어 있는 분류체계는 수작업에 의한 분류로 인해 증가하는 웹문서의 양에 효율적으로 대처하기 곤란하므로 자동분류기법을 활용한 분류가 더 효율적일 것이다. 본 논문에서는 국방인트라넷의 수작업으로 구축된 분류체계를 대상으로 용어 가중치를 계산하는 방법을 달리하여 다양한 분류기법을 적용하여 성능을 비교평가하고 웹문서 자동분류시스템에 적용하여 분류성능의 향상을 도모하고자 한다.

• Korean Journal of Plant Taxonomy
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• v.41 no.1
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• pp.16-34
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• 2011

Scirpus L. s.l. of Cyperaceae has been regarded as a monophyletic group, but the taxa of Scirpus s.l. were rearranged into the five independent genera in recent molecular phylogenetic research: Bolboschoenus (Asch.) Palla, Schoenoplectus (Rchb.) Palla, Schoenoplectiella Lye, Scirpus L., and Trichophorum Pers. In this study, we examined the morphological characteristics and presented the delineation of the five genera of Scirpus s.l., including 21 taxa from South Korea. As a result of our investigation and analysis of domestic collections and those from abroad, the each taxon could be identified using key characteristics of the rhizome features; a cross-section of culm; the degree of development and the width of leaves; the shapes of the membranous region of leaf sheath; and the shapes and size of inflorescence, bract, floral scale, and achene. These major characteristics are illustrated and artificial keys are suggested in this study. In addition, we suggest a new combination for an unrecorded taxon of Schoenoplectiella that was discovered in Gangwon-do, Goseong-gun and give it the Korean name, as 'a-do-song-i-go-raeng-i'.

• Journal of Intelligence and Information Systems
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• v.18 no.3
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• pp.1-12
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• 2012

There are many trees in a roadside, parks or facilities for landscape. Although we are easily seeing a tree in around, it would be difficult to classify it and to get some information about it, such as its name, species and surroundings of the tree. To find them, you have to find the illustrated books for plants or search for them on internet. The important components of a tree are leaf, flower, bark, and so on. Generally we can classify the tree by its leaves. A leaf has the inherited features of the shape, vein, and so on. The shape is important role to decide what the tree is. And texture included in vein is also efficient feature to classify them. This paper evaluates the performance of a leaf classification system using both shape and texture features. We use Fourier descriptors for shape features, and both gray-level co-occurrence matrices and wavelets for texture features, and used combinations of such features for evaluation of images from the Flavia dataset. We compared the recognition rates and the precision-recall performances of these features. Various experiments showed that a combination of shape and texture gave better results for performance. The best came from the case of a combination of features of shape and texture with a flipped contour for a Fourier descriptor.

• Korean Journal of Plant Taxonomy
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• v.35 no.1
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• pp.57-80
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• 2005

Morphological variation of Quercus L. subgen. Quercus in Korea was examined by numerical methods including principal components analysis of major morphological characters. Principal components analysis revealed the presence of five major species groups of the subgen. Quercus in Korea; these include 1) a group consisiting of Q. acutissima and Q. variabilis individuals, 2) Q. dentata, 3) Q. aliena, 4) Q. mongolica, and 5) Q. serrata. The putative interspecific hybrid individuals occupied intermediate position between the putative parent species in the PCA plot. The analysis also strongly suggested that size and shape of leaf blade and teeth or lobes, twig diameter, size and shape of nuts, and length and width of scales are very useful in distinguishing the species and the putative hybrids of the subgen. Quercus.

• Korean Journal of Plant Taxonomy
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• v.39 no.3
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• pp.181-192
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• 2009

Sambucus pendula Nakai, which is an endemic on Ulleung Island of Korea, is characterized by a large pendulous inflorescence and small fruit. A set of 256 individuals were used to investigate the patterns of intraspecific variation of S. racemosa subsp. kamtchatica, S. racemosa subsp. sieboldiana, and S. williamsii including S. pendula using PCA (principal components analysis). This analysis showed that S. pendula was distinct based on its large inflorescence and long peduncle. Our data showed a morphological distinction between subsp. kamtchatica from northeastern areas and subsp. sieboldiana from Jeju Island, but the two taxa overlap in the southern and eastern parts of Korea in terms of chromosome number, color of style, and allozyme data. Our study agrees that S. pendula on Ulleung Island may be the result of genetic drift that occurred during isolation since the Quarternary period. This has been suggested as a reason for the genetic differences observed between two taxa and would explain the unique variation patterns of S. pendula. However, the morphological differentiation between the S. racemosa complex and S. pendula is not considered sufficient to warrant recognition of specific status. Therefore, we recommend that only one polymorphic species of S. racemosa in Eurasia be recognized and that S. pendula be considered a subspecies of S. racemosa.

• Korean Journal of Plant Taxonomy
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• v.31 no.3
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• pp.253-265
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• 2001

Cymopterus melanotilingia (Apiaceae) was reviewed by external morphology and cross-section of leaf-margin and mericarp, and the taxonomic position of species and genus was reexamined. Based on these results, the description and adistribution map of C. melanotiligia were obtained. The leaf-margin forms a collenchymatous ridge by projecting toward the lower part. One mericarp has 2-lateral ribs and 2-intermediate ribs and the other mericarp has 2-lateral ribs and 1-dorsal rib, suggesting each of them is asymmetric. These characters show that this species does not belong to the genus Ostericum s.s., but should be treated as the genus Cymopterus.

• Korean Journal of Plant Taxonomy
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• v.45 no.4
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• pp.299-305
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• 2015

A comparison of the external morphology and spores clearly distinguished Huperzia lucidula (Michaux) Trevis. in northeast Asia and North America in terms of leaf shape, leaf margin, distribution of stomata on leaves, and spore shape. Therefore, the northeast Asian plants should be treated as a separate species, H. asiatica (Ching) B.-Y. Sun & J. Lim. In addition, we believe that H. javanica (Sw.) C. Yang, regarded as conspecific or infraspecific with H. serrata (Thunb.) Trevis., is a distinct species based on the presence of a leaf petiole and serrated leaf margins, and the shape of the gemmiferous branchlets.