• Animal Systematics, Evolution and Diversity
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• v.32 no.3
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• pp.230-233
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• 2016

In the family Hydroptilidae, Trichoptera, 11 species in 3 genera, Hydroptila Dalman, 1819, Oxyethira Eaton, 1873 and Stactobia McLachlan, 1880, have been recorded from the Korean Peninsula but, until now, no species in the genus Orthotrichia Eaton, 1873. In this paper, we describe a new Korean species, Orthotrichia coreana sp. nov., based on adult specimens from the middle reaches of rivers in the southern region of the peninsula. This species is similar to O. iriomotensis Ito, 2013 from the southernmost region of Japan, but is clearly discriminated from the latter by features of the male and female genitalia.

• Animal Systematics, Evolution and Diversity
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• v.32 no.4
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• pp.258-265
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• 2016

Acrobeloides nanus (de Man, 1880) Anderson, 1968 belonging to the family Cephalobidae Filpijev, 1934 (Cephalobomorpha) is newly reported from South Korea. This species is distinguished from other Acrobeloides species by its low and blunt labial probolae, five lateral incisures with middle incisure extending to the tail tip, and bluntly rounded tail. In this study, details of morphological characters of A. nanus is described and illustrated based on optical and scanning electron microscopy. In addition, molecular sequence data of the D2-D3 region of 28S rDNA, 18S rDNA and mitochondria DNA cox1 region from this species are provided as DNA barcode sequences.

• Animal cells and systems
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• v.11 no.2
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• pp.155-160
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• 2007

The skin of the Korean bullheads, Pseudobagrus brevicorpus and P. koreanus, is composed of epidermis, dermis and subcutis. The epidermis has three layers, the outermost layer, middle layer and stratum germinativum. The epidermis consists of two types of gland cells, an unicellular mucous cell of sulfomucin and a large club cell having sometimes two nuclei. The epidermis has numerous intraepithelial blood vessels in P. brevicorpus but not at all in P. koreanus. Lymphatic spaces containing lymphocytes are well developed in mainly the stratum germinativum. The dermis lacks scales and consists mostly of bundles of coarse collagen fibers. The collagen bundles are arranged in parallel to each other in the dorsum and lateral region toward the dorsum, but vertically at intervals in the abdomen and lateral region toward the abdomen. Considering this unique skin structure, the two species are likely to exercise cutaneous respiration as a dual respiratory system to overcome hypoxic conditions which frequently occurs in their habitats.

• Journal of Plant Biology
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• v.34 no.4
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• pp.274-281
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• 1991

The relationship between elongation of hypocotyl and its vascular transition was studied with seedling of Glycine max. the hypocotyl elongation proceeded acropetally from the base of hypocotyl toward the cotyledonary node. The vascular transition did not occur in the basal region of the hypocotyl, which did not nearly elongate, with exarch radial vascular bundles. However, the vascular transition was almost completed at the middle part of the hypocoty, more or less elongated, with endarch collateral vascular bundles. Such bundles also appeared in the uppermost region of the hypocotyl, in which the elongation was the most striking. These results suggested that the vascular transition was related to the hypocotyl elongation and that the transition of primary vascular system in Glycine max seedling was established by rather rapid process. Our observations of the serial sections from root to hypocotyl revealed that the vascular system through the root-hypocotyl-cotyledon was a unit, to which one of the epicotyl that did not participate in transition was superimposed.

• 한국전산유체공학회:학술대회논문집
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• 2007.04a
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• pp.50-52
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• 2007

In the present paper, some difficulties encountered in predicting airfoil characteristics are described and solutions for those problems are discussed Since drag is determined by the amounts of pressure and, especially, shear stress, accurate estimation of shear stress is very crucial. However shear stress computation is dependent on the grid density and turbulence model, it should be consistent in preparing grid and turbulence model. When the transition from laminar to turbulent happen at the middle of airfoil, CFD solver should divide the region into laminar and turbulent region based on the transition location.

• Restorative Dentistry and Endodontics
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• v.15 no.2
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• pp.115-121
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• 1990

Forty extracted human mandibular second molars with C-shaped canal were chosen to study the anatomy of the root canal. The experimental teeth were injected with china ink, decalcified and cleared with Winter green oil, in vitro, to study the number of root, root canal, canal per root, frequency and location of lateral canal and transverse anastomosis. 1. All teedth had one root. 2. Mesial roots with two canals were 25%, and mesial roots with one canal were 75%. All distal roots had one canal. 3. In the roots with two canals, the common apical foramen appeared in 20% and the separte apical foramen appeared in 80%. 4. The frequence of lateral canal was 33.3% and the most frequent region was middle 1/3. 5. All teeth had the transverse anastomosis in all region of the roots.

• The Journal of the Korea Contents Association
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• v.15 no.6
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• pp.539-546
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• 2015

In this study, we develop numerical model using the elliptic mild-slope equation for waves propagating around axis-symmetric topographies where the water depth varies arbitrarily having zero at the coastline. The entire region is divided into three regions. In the both of inner and outer regions, an existing analytical solutions are used. In the middle region, the finite element technique is applied to the governing equation. To get the solution, the methods of separation of variables, Frobenius series are used. Developed solution is validated by comparing with previously developed analytical solution. We also investigate various cases with different bottom topographies.

• Korean Journal of Pharmacognosy
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• v.2 no.2
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• pp.99-118
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• 1971

The flora of Mt. Du Ryun were investigated by the authors from November 3, 1955 to July 21, 1970. 1) Mt. Du Ryun is located at Heanam-Gun, Junla-Nam Do, Korea (between longitude $126^{\circ}\;35'\;E$ and $126^{\circ}40'{\;}E$, and between $34^{\circ}25'$ N.L. and $34^{\circ}30'$ N.L. on the latitude.). Average temperature is $14.1^{\circ}C$, and precipitation per annum 1,488.7mm. 2) On the whole, the observed floral region consisted of 5 formas, 56 varieties, 770 species, 440 genera, 159 families, in 86 orders. 3) The medicinal plants in the area include 321 species, 242 genera and 120 families. 4) The region includes 2 formas, 7 varieties, 30 species in 24 families of evergreen trees. It was pointed out that this area is a typical warm zone in the Korean flora.

• Hwankyungkyoyuk
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• v.13 no.2
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• pp.103-113
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• 2000

The 7th national curriculum for environmental education in elementary and secondary school focuses on consideration of learner's ability, learner's activities, and learner's region of everyday life. The contents of environmental education are scattered subjects in elementary schools and an independent subject as 'Environment'in middle school and 'Environment and Ecology'in high school of the second school. With upgrading of schools, the aims and activities of environmental learning move up from value-centered, through activity-oriented and to cognition-centered.

• Journal of Fisheries and Marine Sciences Education
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• v.28 no.5
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• pp.1244-1257
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• 2016

Recently, the export for SMEs is the main issue as the successful key for enterprises. For this reason, Many SMEs want to try the export and the supports are provided by government. This phenomenon reflects that the export should be necessary to SMEs, even other enterprises. This study analyzes 6 enterprises (Enterprise of middle standing: 2, SMEs:4) to research the main factors for export using the interview and survey. The result provides 5 implications for the export of SMEs in Busan Region. In summary, we can provide 3 main proposes for the export of SMEs. 1) The differentiation of various support that can be a real help to SMEs, 2) The differentiation of education on exports. 3) The simplification for the complex administrative procedures about export.