• Journal of Species Research
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• 제5권3호
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• pp.348-350
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• 2016

An asteroid specimen was collected from Jumunjin, Gangwon-do in the East Sea, Korea at a depth of 50 m using fishing nets on 26 May 2013. It was identified as Pteraster militaris (O.F. $M{\ddot{u}ller$, 1776) belonging to the family Pterasteridae of the order Velatida based on morphological characteristics. This species is usually distributed in the cold boreal zone around northern Pacific and Atlantic, and is distinctly distinguished from P. tesselatus which was reported in Korean fauna: body form, length ratio of arm to disc and surface of dorsal membrane.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 가을 학술발표회 논문집
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• pp.101-108
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• 2000

This paper presents the results of finite element analysis on the seismic response of a soil-reinforced segmental retaining wall subjected to a prescribed earthquake record. The results of finite element analysis indicate that the maximum wall displacement occurs at the top, exhibiting a cantilever type of wall movement. Also revealed is that the increase in reinforcement force is more pronounced in the upper part of the reinforced zone, resulting in a more or less uniform distribution. None of the design guidelines appears to be able to correctly predict the dynamic force increase when compared with the results of finite element analysis. The results demonstrated that there exist critical stiffness and length of reinforcement beyond which further increase would not contribute to additional reinforcing effect. Based on the findings from this study, a number of implications to the current design methods are discussed.

• 제어로봇시스템학회논문지
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• 제10권1호
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• pp.66-72
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• 2004

To assess tunnel safety, cracks in tunnel lining are measured by inspectors, who observe cracks with their naked eyes and record them. But manual inspection is slow, and measured crack data is subjective. Therefore, this study proposes inspection system fur measuring cracks in tunnel lining and providing objective crack data to be used in safety assessment. The system consists of On-vehicle system and Laboratory system. On-Vehicle system acquires image data with line CCD camera on scanning along the tunnel lining. Laboratory system extracts crack information from the acquired image using image processing. Measured crack information is crack thickness, length and orientation. To improve accuracy of crack recognition, the geometric properties and patterns of cracks in concrete structure were applied to image processing. The proposed system was verified with experiments in both laboratory environment and field environment such as subway tunnel.

• Fisheries and Aquatic Sciences
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• 제6권3호
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• pp.135-139
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• 2003

During routine survey of Pacific oyster (Crassostrea gigas) collected from Tongyoung area in southern coast of Korea, histological examination revealed that a intracellular microorganisms infected the digestive gland of the oyster. They infected hepatopancreatic cells extensively. The size of intracellular microorganism was of 45 to 86nm in diameter and 200nm to more thar 500nm in length. They were pleomorphic. The morphological characteristic of intracellular microorganisms lacked cell wall and was bounded by the plasma membrane. They contained typical prokaryotic ribosomes and fibrillar DNA-like strands. No additional internal structure has been observed. Based on the lack of cell wall and the cellular localization, the intracellular microorganism is considered as a Mycoplasma-like organism.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제32회 KOSCO SYMPOSIUM 논문집
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• pp.205-212
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• 2006

Three-dimensional numerical study was carried out for the investigation of the detonation wave structures propagating in tubes. Fluid dynamics equations and conservation equation of reaction progress variable were analyzed by a MUSCL-type TVD scheme and four stage Runge-Kutta time integration. Chemical reaction was modeled by using a simplified one-step irreversible kinetics model. The variable gas properties between unburned and burned states were considered by using variable specific heat ratio formulation. The unsteady computational results in three-dimension show the detailed mechanisms of rectangular and diagonal mode of detonation wave instabilities resulting same cell length but different cell width in smoked-foil record. The results for the small reaction constant shows the spinning mode of three-dimensional detonation wave dynamics, which was rarely observed in the previous numerical simulation of the detonation waves.

• 환경생물
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• 제38권1호
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• pp.101-105
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• 2020

Ralfsia longicellularis is known as an endemic species in Far East Asia. In this study, we report R. longicellularis as a new record from Korea based on morphological and molecular analyses. Molecular analyses based on plastid-encoded rbcL gene sequences and morpho-anatomical studies were undertaken on Ralfsia species, a poorly studied genus from Korea. Ralfsia longicellularis is mainly characterized by a dark brown thallus; 770-1200 ㎛ thick, curved cells in the creeping and ascending parts of the filaments; basal layer and erect filament cells with a width-to-length ratio of 1 : 1.5 to 10; narrowshaped sporangia on-stalk cells at the base of the paraphyses; and mostly uniseriate plurilocular reproductive organs capped with 1-2 sterile cells. The R. longicellularis samples from Korea in this study were similar to ones collected from the type locality (Peter the Great Bay, Russia) in morphology. The rbcL analyses also revealed that our Korean R. longicellularis samples were placed in the same clade with Russian materials, within a Ralfsia clade but distinct from the congeners.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 춘계학술대회논문집
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• pp.1189-1194
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• 2002

Acoustic intensity is usually estimated by the cross-spectrum of acoustic pressure at two adjacent micrphones. The cross-spectrum calculated by digital Fourier transform technique will unavoidally have leakage error since the period of signal will not be usually coincident with record length. Therefore, the acoustic intensity estimated by the conventional r]n analyzer will show distorted value. In this paper the expression of the Fourier transformed data of a harmonic signal is formulated when there is leakage error. The method to elimate the effect of leakage error from the contaminated data is also proposed. Some numerical examples show the validation of the proposed method.

• Animal Systematics, Evolution and Diversity
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• 제32권2호
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• pp.141-147
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• 2016

The genus Discorsopagurus and two species belonging to this genus, Discorsopagurus maclaughlinae and Discorsopagurus tubicola, are herein first reported in Korean waters. Species belonging to Discorsopagurus are easily distinguished from other hermit crabs of the family Paguridae by their telsons that lack indentations and other characteristics such as straight abdomens, fused third and fourth abdominal tergites, and symmetrical uropods. Discorsopagurus maclaughlinae and D. tubicola were found to live in a tube made by a polychaete tubeworm. The two species differ in the shape of the posterior margin of the telson, the length of the pereopod, and the presence of setae on the antennal flagellum. Discorsopagurus tubicola is reported for the second time in the world. In this paper, there will be provided plates and descriptions of the two species.

• The Journal of Korean Physical Therapy
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• 제12권2호
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• pp.49-55
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• 2000

The purpose of this study was to identify the characteristics oi gait patterns and to find the effects of the gait function on the P.N.F. pelvic pattern. The subjects of this study were 40 hemiplegic patients who either hospitalized in or out patients at department physical therapy, Tae-Bong hospital and Masan college health education center. The study on these patient were done from July 20.1999 through May 10,2000. Method of gait pattern assessment used ink foot print record. The results were as follows: 1. There were significiant difference in cadence and stride length(p<0.05). 2. There were significiant difference in gait velocity (p<0.05).

• Ocean and Polar Research
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• 제27권4호
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• pp.491-495
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• 2005

The morphology of a leptocephalus Nettenchelys gephyra (Hettastornatidae) is described from one specimen collected of Pohang $(35^{\circ}46'N,\;129^{\circ}52'E)$ in the East Sea, Korea on December 2003. The body is laterally compressed. The body deepens gradually behind the head to the deepest point of the midbody range that is 15.8% of the standard length 31.7mm, then tapers gradually toward the tail. The anus is located somewhat posteriorly to midbody. There are two intestinal swellings, which are located at the 19th and 41st myomere, respectively. The vertical blood vessel's last location is at the 48th myomere. The lateral pigment spot begins at the 84th myomere.