• ALGAE
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• 제21권2호
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• pp.209-216
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• 2006

The characteristics of Peyssonnelia capensis Montagne (Peyssonneliaceae, Rhodophyta) from Jeju Island were investigated in order to clarify the species entity and re-evaluate taxonomic position. The morphological variations of the Peyssonnelia capensis from Jeju Island were divided into two types, the thin thallus type and the thick thallus type. The thin thallus type is characterized by thin, soft, orbicular, slightly lobed thallus with entire to undulate margin, and compact rhizoids. The thick thallus type has thick and stiff thallus with sinuate margin and scattered rhizoids, and has more branches than the thin thallus type. The basal layer and the epithallium of thin thallus type are similar to those of thick thallus types in their structure. However, the hypothallial cells of the thick thallus type are longer than those of the thin thallus type. The erect filament of thick thallus type has more cells than those of the thin thallus type. Tetrasporangial nemathecia are distinctly protruded. Mature tetrasporangia of this species are divided cruciately into four spores as those of other Peyssonneliaceae. In addition to their morphological and anatomical distinctness between two types, the nucleotide sequence analyses of SSU and ITS2 region make no differences among populations from Jeju and other localities in Korea. Therefore these two morphological variation may not base on genetic variation.

• 식물분류학회지
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• 제46권4호
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• pp.405-412
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• 2016

한국내의 초종용은 한반도의 서해, 남해, 동해의 해안가 및 도서지역에 제한적으로 분포한다. 본 연구는 울릉도와 독도를 중심으로 12개 자생지에서 초종용의 종내 형태형질 변이를 관찰하고 지리적 분포 양상을 조사하였다. 그 결과, 외부 형질(줄기, 잎, 포엽, 꽃받침 그리고 화관)에서 털의 유무에 의하여 두 개의 type (G-type, glabrous; P-type, pilose)을 확인하였다. 확인된 두 개의 형태학적 type은 확인된 자생지에서 뚜렷한 지리적 분포 양상을 보여주었다. 한반도와 제주도에는 P-type, 울릉도에는 G-type과 P-type 그리고 독도의 동도에는 G-type만이 관찰되었다. 초종용은 외부 형태 형질에 의하여 서로 다른 두 개의 type이 확인되고 뚜렷한 지리적 분포 양상을 보여주기 때문에, 털이 없어지는 형태적 변이가 단순히 일시적인 우연의 결과물이 아니라 초종용 내에 이주 및 군체 형성의 과정을 동반하는 진화적으로 서로 다른 계통이 있음을 추정할 수 있다. 제한된 지역에서 분포하는 독도의 초종용은 유일하게 G-type 으로 확인되었으며 이는 독도 자생종의 의미와 함께 중요한 식물지리학적 가치를 가지고 있기 때문에 자생지 보전을 위한 노력이 필요하다.

• Animal Systematics, Evolution and Diversity
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• 제33권3호
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• pp.189-194
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• 2017

The Zopheridae Solier consisting of members from three previous families, Zopherinae Solier, Monommatinae Blanchard and Colydiinae Erichson, is considered the taxonomically most challenging group, and comprises more than 1,700 described species worldwide. The members of Zopheridae represent diverse morphological variations, and are difficult to separate morphologically from other tenebrionoid families. Two Zopheridae genera, Colobicus Latreille and Lasconotus Erichson, are identified for the first time in Korea, and two wood-boring species, C. hirtus (Rossi) and L. niponicus (Lewis), are newly reported in the Korean fauna. A key to the genera of Korean Zopheridae, and diagnoses, habitus photographs, and illustrations of diagnostic characters of the two species are provided.

• 한국멀티미디어학회논문지
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• 제4권1호
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• pp.67-74
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• 2001

본 논문에서는 컬러 정지 영상에서 색상과 모양 정보를 이용한 얼굴 영역 검출 알고리즘을 제안한다. 제안된 알고리즘은 YCbCr 색공간에서 Cb와 Cr성분만을 이용하여 조명의 영향을 줄일 수 있다. 피부색 분할을 한후 얼굴 후보 영역들의 잡음 제거와 단순화를 위해 형태학적 필터와 기하학적 교정을 거친다. 입력 영상 내에 여러 사람이 존재할 경우에도 레이블링을 통해 각각의 얼굴 후보 영역들로 분리할 수 있고, 또한 2차 모멘트를 기반으로 한 타원 특징들을 추출하여 기울어진 얼굴 영역들도 성공적으로 검출할 수 있다.

• 전기학회논문지
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• 제58권6호
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• pp.1207-1214
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• 2009

In this study, we propose a novel color-image segmentation algorithm to discern the teeth region utilizing RG intensity and its relevant RGB histogram features with resolving the variations of its maximum intensity in terms of peaks and valleys. Tooth candidates in a CCD image are first extracted by applying RGB color multi-threshold levels and consequently the successive morphological image operations and a Sobel-mask edge processing are performed to resolve the teeth region and its contour.

• Animal Systematics, Evolution and Diversity
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• 제33권4호
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• pp.267-273
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• 2017

The opossum shrimp, Siriella Dana, 1850 belongs to the family Mysidae Haworth, 1825. It is the genus of an enormous number of species with frequent morphological variations comprising 84 valid species to date. Among the species, Siriella trispina Ii, 1964 has been recorded from the Yellow Sea and the East China Sea is reported from Korean water for the first time. Siriella trispina is characterized by its exceedingly elongated 5th pair of thoracopods, the spines on the inner ventral margin of the uropodal endopod armed with secondary spinules, and 4-5 pairs of spines on the base of the telson. In the present study, we describe Korean specimens of the species in detail with photographs and illustrations. Siriella trispina is the 8th Siriella species found in Korean fauna.

• 한국패류학회지
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• 제10권2호
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• pp.41-46
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• 1994

The Antarctic soft-shelled clam, Laternula elliptica is widely distributed in shallow waters around the Antarctic Continent and islands. This bivalve species occurs in densepatches particularly in sheltered but frequently ice-impacted areas. This species mostly occurs at atound 20-30 m depth and is rarely found at depths shallower than 5 m where ice abrasion by drifting or grounded icebergs is severe. It burrows deep into sedimint(frequently >50 cm), which seems to be primarily a means for avoiding ice impacts. A pair of stout and highly extendable siphons appear to be a morphological reature to feed in the ice-scoured substrates while staying deep in the sedimint. As one of the largest bivalves in the Antarctic waters, L. elliptica appears to grow rapidly, reaching to a shell length of approximately 100 mm in 12 or 13 years. L. elliptica feeds sctively during summer when food is sufficiently provided, implying that food may be the most inportant fator regulating the growth. Seasonal variations in food availability, and metabolic process in starvation condition possibly during winter, however, are yet to be further investigated.

• 말소리와 음성과학
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• 제7권4호
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• pp.49-55
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• 2015

It is argued in this paper that, in determining semantic similarity, Korean words should be recategorized with a focus on the semantic relation to ontology in light of cross-linguistic morphological variations. It is proposed, in particular, that Korean semantic similarity should be measured on three tracks, human judgements track, relatedness track, and cross-part-of-speech relations track. As demonstrated in Yang et al. (2015), GloVe, the unsupervised learning machine on semantic similarity, is applicable to Korean with its performance being compared with human judgement results. Based on this compatability, it was further thought that the model's performance might most likely vary with different kinds of specific relations in different languages. An attempt was made to analyze them in terms of two major Korean-specific categories involved in their lexical and cross-POS-relations. It is concluded that languages must be analyzed by varying methods so that semantic components across languages may allow varying semantic distance in the vector space models.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집B
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• pp.381-384
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• 2000

Relationships between biochemical phenomena and hemodynamics on human endothelial cells are very important to study the mechanism of atherosclerotic formation and development. The objective of this study is to investigate the flow phenomena around the endothelial cell model by the PIV experiment. The microscopic images of endothelial cells were acquired by a CCD camera to fabricate the shape of endothelial cell. The cell models were fabricated by using a photoforming process. Two consecutive particle images were captured by the CCD camera for the image processing. Conifer powder as the tracing particles was added to water to visualize the flow field. The cross-correlation method was applied fer the image processing of the flow visualization. Pressure and wall shear stress variations on the surfaces of the endothelial cells were calculated to investigate the effects of hemodynamic forces on the morphological changes.

• ALGAE
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• 제17권3호
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• pp.161-170
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• 2002

The vegetative and reproductive features of Grateloupia filicina (Lamouroux) C. Agardh (Cryptonemiales, Halymeniaceae) from different parts of the Indian Coast were studied. The plants grow in wide range of habitats and showed a lot of morphological variations. The development of the thallus is multiaxial type and the medullary region is composed of irregular, branched and stellate shaped cells. The gametophytic plants are dioecious and the male plants are smaller compared to female plants. The carpogonial branch is two-celled and formed on an a accessory branch system known as ampulla. Cystocarps are spherical to sybspherical with distint ostioles and scattered on the thallus surface. Tetrasporangia are common and tetraspores are either cruciate or decussate. Bisporangia are occasionally encountered. Our study suggests occurrence of two intraspecific taxa of G. filicina i.e.: var. luxurians and var. filinina from India coast.