Spring Distribution of Ciliate Plankton in the Southeastern Yellow Sea in 2019     

Kim  Young Ok  Choi  Jungmin  Kang  Hyung-Ku  Noh  Jae Hoon  Choi  Dong Han  Oh  Kyung-Hee 《Ocean Science Journal》2021,56(1):69-77

Ocean Science Journal - As planktonic ciliates have been recognized as important players in marine microbial food webs, relevant studies have been conducted in the western coastal waters of the...  相似文献   

Marine-Derived Fungi in Korea     

Kwon  Yong Min  Bae  Seung Sub  Choi  Grace  Lim  Ji Yeon  Jung  Yoon-Hee  Chung  Dawoon 《Ocean Science Journal》2021,56(1):1-17

Ocean Science Journal - Studies on marine fungi (termed as ‘marine-derived fungi’ in this paper) have been significantly increasing worldwide because of the critical role displayed by...  相似文献   

Effects of Green Light on the Stress Response of Olive Flounder Paralichthys olivaceus under Clove Oil Anesthesia     

Choi  Cheol Young  Song  Jin Ah  Park  Young-Su 《Ocean Science Journal》2021,56(1):78-85

Ocean Science Journal - Clove oil (CO) is an effective anesthetic. Many hatcheries and research studies use clove oil to immobilize fish for artificial reproduction and surgery to suppress their...  相似文献   

Molecular identification of anisakid nematodes third stage larvae isolated from common squid (Todarodes pacificus) in Korea     

Eko Setyobudi  Chan-Hyeok Jeon  Kwangho Choi  Sung Il Lee  Chung Il Lee  Jeong-Ho Kim 《Ocean Science Journal》2013,48(2):197-205

The occurrence of Genus Anisakis nematode larvae in marine fishes and cephalopods is epidemiologically important because Anisakis simplex larval stage can cause a clinical disease in humans when infected hosts are consumed raw. Common squid (Todarodes pacificus) from Korean waters were investigated for anisakid nematodes infection during 2009～2011. In total, 1,556 larvae were collected from 615 common squids and 732 of them were subsequently identified by PCR-RFLP analysis of ITS rDNA. Depending on the sampling locations, the nematode larvae from common squid showed different prevalence, intensity and species distribution. A high prevalence (P) and mean intensity (MI) of infection were observed in the Yellow Sea (n = 250, P = 86.0%, MI = 5.99 larvae/host) and the southern sea of Korea (n = 126, P = 57.1%, MI = 3.36 larvae/host). Anisakis pegreffii was dominantly found in common squid from the southern sea (127/ 140, 90.7%) and the Yellow Sea (561/565, 98.9%). In contrast, the P and MI of infection were relatively low in the East Sea (n = 239, P = 8.37%, MI = 1.25 larvae/host). A. pegreffii was not found from the East Sea and 52.0% (13/25) of the nematodes were identified as A. simplex. Most of them were found in the body cavity or digestive tract of common squid, which are rarely consumed raw by humans. Considering the differenences in anisakid nematode species distribution and their microhabitat in common squid, it remains unclear whether common squid plays an important role in the epidemiology of human anisakis infection in Korea. Further extensive identification of anisakid nematodes in common squid, with geographical and seasonal information will be necessary.  相似文献   

Finite element simulation of fluid flow in fractured rock media   总被引：4，自引：3，他引：1  

R. Kristinof  P. G. Ranjith  S. K. Choi 《Environmental Earth Sciences》2010,60(4):765-773

Fluid dynamics models are used by the petroleum industry to model single- and/or multi-phase flow within fractured rock formations, in order to facilitate extraction of fluids such as oil and natural gas, and in other areas of engineering to study groundwater flow, as well as to estimate contaminant seepage and transport. In this paper, the numerical modelling software Comsol is used to simulate air and water flow through a specimen of granite with a single vertical fracture subjected to triaxial loading conditions. The intent of the model is to simulate triaxial test findings on a rock specimen with a natural fracture. Fluid flow is simulated at various confining and inlet pressures using the cubic law. Model results were in good agreement with laboratory findings. Pressure distribution along the fracture and across the specimen are as expected with a near linear pressure distribution along the length of the fracture. A drawdown effect on pressure distribution across the specimen in the vicinity of the fracture is also observed. Pressure gradient was largely uniform; however, some localised zones of high gradient along the fracture are observed.  相似文献   

Genesis and Mineralogy of Serpentinite Deposits,West of South Korea     

Song Suckhwan  Choi Seon Gyu  Lee Hyun Koo 《中国地质大学学报(英文版)》2000,11(2)

The serpentinite deposits derived from ultramafic rockswithin the South Korea mainly occur in the west ofChungcheongnam - Do,the south of South Korea,Ulsan andAndong area,and in the middle of South Korea,Gapyeongarea. The present study is on the genesis and m ineral compo-sitions of the serpentinite deposits consisting of abouteighteenmasses in the west of Chungcheongnam- Do. The ultramaficrocks mainly occur as discontinuously isolated lenticular or el-liptical bodies and extend to NNE d…  相似文献   

Behavior of marine pipelines under seismic faults     

N.Y Kershenbaum  S.A Mebarkia  H.S Choi   《Ocean Engineering》2000,27(5):132

A new study investigates an unburied offshore “snaked” pipeline behavior under various types of seismic faults. The snaking of the pipeline is caused by the thermal/pressure expansion and soil friction. The snaking takes place at a certain distance from the pipeline's unrestrained end and gradually increases towards the restraint. It is shown that longitudinal seismic faults have less effect on a straight pipeline than a snaked pipeline. The new seismic analysis demonstrates that an increase of ground displacement causes a very small change in bending and longitudinal stresses. The new approach results in a safe, subsea pipeline construction and operation with a significant cost reduction.  相似文献   

Quaternary Crustal Deformation in the Southeastern Part of the Korean Peninsula     

Bong Joo Lee  Chung-Ryul Ryoo  Deung-Lyong Cho  Sung-Ja Choi  Ueechan Chwae   《Gondwana Research》1999,2(4):578-582

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Potential Impacts to Groundwater from Ground‐Coupled Geothermal Heat Pumps in District Scale   总被引：1，自引：0，他引：1       下载免费PDF全文

Lee J. Florea  Dave Hart  James Tinjum  Chris Choi 《Ground water》2017,55(1):8-9

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Bifurcations of thick-walled hollow cylinders of geomaterials under axisymmetric compression     

K. T. Chau  S. K. Choi 《国际地质力学数值与分析法杂志》1998,22(11):903-919

This paper derives analytically the condition for the onset of diffuse mode bifurcations in thick-walled hollow cylinders with internal radius a, external radius b and length L under axial compression and confining pressure. The thick-walled cylindrical specimens are made of geomaterial characterized by Rudnicki's constitutive model, and the method of solution for the governing equations is the velocity potential approach employed by Chau. Numerical results show that thick-walled cylinders are stronger than thin-walled cylinders against diffuse mode bifurcations, including both buckling, axisymmetric and non-axisymmetric deformations. In contrast to the conclusion for solid cylinders (Chau), no buckling solution is found for γ = mπa / L smaller than about 0·7 under compression for a fixed and finite value of a / b (i.e. no buckling for long and slender hollow cylinders with small a / L and fixed b / a). When 0·7 < γ < 0·9, buckling is the expected first bifurcation; whereas, when γ > 0·9, bulging or barrelling is anticipated. The exact value of γ that excludes buckling and separates the buckling and barrelling phenomena depends on the current values of the constitutive parameters of the solid. Hollow cylinders with higher degree of anisotropy, disobeying normality flow rule, and subjected to confining pressure are more conducive to bifurcations than cylinders made of materials with isotropy, obeying normality, and subjected to no confining pressure. In addition, diffuse mode bifurcations are found possible in the pre-peak regime of the stress–strain curve. © 1998 John Wiley & Sons, Ltd.  相似文献