• Proceedings of the Zoological Society Korea Conference
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• 2001.10a
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• pp.115.2-115
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• 2001

No Abstract, See Full Text

• 대한예방의학회:학술대회논문집
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• 2000.10a
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• pp.25-26
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• 2000

• Journal of the Korean Geographical Society
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• v.35 no.5
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• pp.665-680
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• 2000

본 연구의 목적은 미국의 산타아나 강 상류 유역분지 내 잠재적 퇴적물 생산량의 공간적 분포 패턴을 고찰하는데 있다. 이를 위해 산타아나 강 상류지역을 42개의 하부 유역분지로 나눈 후에 각 유역분지에 퇴적물 생산량에 영향을 주는 지형 기복 요소, 면적-형태 요소, 지질 요소, 기후 요소와 관련하여 20개의 변수를 GIS를 이용하여 추출하였다. 이러한 20개의 변수들을 기초로 군집분석하여 42개 하부 유역분지들의 잠재적 퇴적물 생산량을 평가한 결과 4개 지역으로 구분되었다. 평가 결과 <발톤> 평기자 포함된 제2지역이 산타아나 강 상류 유역분지에서 가장 퇴적작용이 왕성한 지역으로 나타났다. 이 지역은 낮은 기복 및 고도와 미고화된 물질로 피복된 지역이 97%를 차지하고 있다. 잠재적 퇴적물 생산량이 가장 높은 지역은 제 2지역의 상류부에 분포하는 유역분지들(제 4지역)로서 높은 기복과 고도뿐만 아니라 침식 면적이 넒으며, 과거의 빙하작용이 있었던 지역이다. 특히 단층선이 퇴적작용이 크게 이루어지고 있는 지역(제2지역)과 잠재적 퇴적물 생산량이 가장 높은 지역(제4지역) 사이에 분포하고 있어, 사면경사의 급변으로 제 2 지역의 퇴적작용은 더욱 가속화 될 것이다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.3
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• pp.359-369
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• 2022

In slope stability analysis for landslides, mountains have various slopes and geographical features, and hence it is necessary to estimate stability using rigorous analysis methods. In this study, after the analysis of infiltration behavior through unsaturated layers due to rainfall, the stability of landslide was estimated to account for the variation of pore water pressures. In the analysis of slope stability, a three-dimensional slope analysis was compared with an infinite slope analysis in a case study of terrain in which an actual landslide occurred. In the three-dimensional slope stability analysis, it was found that the location of the failure and the failure area were predicted accurately based on the detailed geological information despite the variation of geographical features.

• ALGAE
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• v.33 no.3
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• pp.269-278
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• 2018

Ocean warming can have significant negative impacts on population genetic diversity, local endemism and geographical distribution of a wide range of marine organisms. Thus, the identification of conservation units with high risk of extinction becomes an imperative task to assess, monitor, and manage marine biodiversity for policy-makers. Here, we surveyed population structure and genetic variation of the red seaweed Gracilaria vermiculophylla along the coast of China using genome-based amplified fragment length polymorphism (AFLP) scanning. Regardless of analysis methods used, AFLP consistently revealed a south to north genetic isolation. Populations at the southern coast of China showed unique genetic variation and much greater allelic richness, heterozygosity, and average genetic diversity than the northern. In particular, we identified a geographical barrier that may hinder genetic exchange between the two lineages. Consequently, the characterized genetic lineage at the southern coast of China likely resulted from the interplay of post-glacial persistence of ancestral diversity, geographical isolation and local adaptation. In particular, the southern populations are indispensable components to explore evolutionary genetics and historical biogeography of G. vermiculophylla in the northwestern Pacific, and the unique diversity also has important conservation value in terms of projected climate warming.

• Journal of the Korean Geographical Society
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• v.30 no.3
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• pp.207-229
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• 1995

The characteristics of weather and climate in South Korea has great influences on the annual variation pattern and the appearance of the prevailing weather. The purpose of this paper is to induce the quantity of the weather entropy and annual variation pattern using the information theory and the principal component analysis. And author tried to classify the region according to the variation of its space scale, The raw materials used for this study are the daily cloudiness and precipitation during the years 1990-1994 at 69 stations in South Korea. It is divided into four classes of fine, clear, cloudy and rainy. The rcsults of this study can be summarized as follows: 1. Thc characteristics of annual variation pattern of weather entropy can be chiefly divided into five categories and the accumulated contributory rate of these is 73.1%. 2. Annual variation pattern of the first principal component reaches smaller in May, April and September than national average, and becomes greater when the winter comes. This weather entropy's quantity(Rs1) is positive in most area to the western sife of Soback Mountains and negative in most seaside area to the eastern side of Soback Mountains. 3. The characteristics of annual variation pattern of the second principal component shows that the entropy is more smaller in summer than national average and the rest of seasons shows larger, especially in January, May and September. This weather entropy's quantity(Rs2) is positive in most Honam Inland area to the western side of Soback Mountains and negative in most Youngnam Inland area to the eastern side of Soback Mountains. 4. Eight type regions (S1-S11) are classified based on the occurrences of minimum weather entropy in South Korea, and annual variation pattern of weather entropy by principal component analysis may be classified into sixteen type regions (Rs1-Rs9). Putting these things together, South Korea can be classifieed into thirty one type regions (Rs1S7-Rs9S10).

• Journal of the Korean Geographical Society
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• v.34 no.5
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• pp.543-560
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• 1999

본 연구는 전국 6개 광역시 및 각 도별로 우리 나라 주요 암의 지역적 분포 현황을 살펴보고 그러한 지역차의 원인을 규명해 보고자 한다. 전국 시 도별 암 등록 현황 자료를 토대로 위암, 직장.결장암, 간암, 폐암과 유방암의 전체 암에 대한 시 도별 상대적 위험도를 분석하여 지리정보체계(GIS)를 이용한 지도화를 근간으로 분석하였다. 위암의 경우 위암 발생의 상대적 위험도는 해당 지역 병원이 부담해야 하는 인구수와 관련성이 있는 것으로 보여졌다. 또한, 폐암의 경우도 대도시지역이 상대적으로 낮은 발병율을 보였으며, 농촌지역은 폐암의 고위험지역으로 나타났다. 이러한 폐암 환자의 분포 현황은 도시 지역에 비해서 농촌 지역의 흡연율이 높은 것과 밀접한 관련성이 있는 것으로 보인다. 직장.결장암의 상대적인 위험도도 도시지역보다는 농촌지역에서 높았다. 이러한 분포 패턴은 농촌지역의 노령화 현상과 관계가 있는 것으로 보인다. 그렇지만, 유방암의 경우 농촌지역보다 대도시지역에서 높은 발암율을 보였다. 이것은 유방암 발생이 식생활을 포함하는 서구화된 생활방식과 관련성이 있음을 시사해 주는 것이다. 간암은 부산, 경남 및 전남 지역에서 높은 환자 빈도를 나타냈다. 특히, 이 해안지역에서의 간암의 상대적으로 높은 위험성은 ‘회’의 섭취로 인한 감염성 질환과 관련이 있는 것으로 보인다.

• The Korean Journal of Zoology
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• v.8 no.2
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• pp.51-54
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• 1965

Present author observed the variation in color and pattern and also those of geographical distribution of Graphosoma rubrolineatum WESTWOOD.And the variations were also studied in relation to the temperature and the humidity . The results are as follows . 1. The variations in color and pattern of G.rubrolineatum were gradually changed into black ones, and so they showed polymorphic. 2. Their colors and patterns were not variated in inland at all, while those variations in island increased according to the distance from the inland. 3. The red color of the patterns appeared the yellowish-red in inland, the blackish -red in island. 4. The variation in color and pattern of G.rubrolineatum occure in the region of the temperature below 22.8$^{\circ}C$ (mean temperaturrre of June, July and August)and the humidity above 72%(yearly average).

• Korean Journal of Fisheries and Aquatic Sciences
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• v.36 no.6
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• pp.632-640
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• 2003

Geographic variation in shell morphology of Thais clavigera $(K\"{u}ster)$ (Gastropoda: Muricidae) was investigated using samples collected from 24 sites along the Korean coast. Multivariate statistical analysis was applied to 9 morphometric and 4 categorical variables. The shells of T. clavigera were classified into two distinct morph types (Type-W and -E). Temperature and salinity of the sampling sites were significantly correlated with the incidence of morph types. Relative abundance of Type-W (thin, yellowish brown shell with triangular nodules) was positively correlated with temperature and negatively correlated with salinity. In contrast, relative abundance of Type-E (thick, dark purple shell with round nodules) was negatively correlated with temperature and positively correlated with salinity. Possible correlation between environmental factors (temperature and salinity) and morphological variations in the shells were discussed.

• Parasites, Hosts and Diseases
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• v.53 no.3
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• pp.253-258
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• 2015

Toxoplasma gondii, an obligate intracellular protozoan parasite of the phylum Apicomplexa, can infect all warm-blooded vertebrates, including humans, livestock, and marine mammals. The aim of this study was to investigate whether superoxide dismutase (SOD) of T. gondii can be used as a new marker for genetic study or a potential vaccine candidate. The partial genome region of the SOD gene was amplified and sequenced from 10 different T. gondii isolates from different parts of the world, and all the sequences were examined by PCR-RFLP, sequence analysis, and phylogenetic reconstruction. The results showed that partial SOD gene sequences ranged from 1,702 bp to 1,712 bp and A + T contents varied from 50.1% to 51.1% among all examined isolates. Sequence alignment analysis identified total 43 variable nucleotide positions, and these results showed that 97.5% sequence similarity of SOD gene among all examined isolates. Phylogenetic analysis revealed that these SOD sequences were not an effective molecular marker for differential identification of T. gondii strains. The research demonstrated existence of low sequence variation in the SOD gene among T. gondii strains of different genotypes from different hosts and geographical regions.