• 한국양식학회:학술대회논문집
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• 한국양식학회 2003년도 추계학술발표대회 논문요약집
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• pp.134-135
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• 2003

The geographic expansion of the toxic dinoflagellates genus Alexandrium has been shown to be world wide ranging. The members of the genus Alexandrium ocnstituted of 20-30 species did not show substantial differences in their morphology, which is mostly referred in the 'tamarensis species complex', except some species. Though rDNA sequences variations are very few and pseudogene types are so diverse that it is difficult to use them as the specific markers. In this study, we outlined Korean and Japanese A, tamarense and A. catenella regional isolates by phylogenetic analysis inferred from no cutting alignments of LSU rDNA D1-D2 and SSU rDNA sequences to group these regional isolates. The results were compared to RFLP patterns of PCR products targeted chloroplast DNA. Lastly screening of highly repeated microsatellite DNA which is frequently used for population analysis in eukaryotes was conducted. A. catenella regional strains identified by the sequencing of rDNA D1-D2 domain were divided into at least 3 groups of type E, CMC and Chinese type, divergence root may not be deep comparing with that of A. tamarense whose pseudogenes are very variable. Results of RFLP pattern and the phylogeny of the unknown gene targeting chloroplast showed that Korean and Japanese A. catenella regional isolates were divided into 3 types: Korean, Japanese and the third CMC types. Population-specific PCR amplification with Japanese A. catenella type-specific PCR primers was useful method for population analysis of A. catenella. Various types of satellite sequences such as 5 nucleotides repeats were obtained from A. tamarense and A. catenella. The 5 nucleotides repeats were primed at the both 3'and 5' ends, and these repeats were prominent as longer repeated motifs. This repeated DNA was intercalated as internal sequences containing various types subrepeats. It is expected that these satellite DNA would be a useful molecular population marker through detail comparison among Alexandrium regional isolates to trace their transferring pathway and to prevent their human-associated their regional extents.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제23권12호
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• pp.660-669
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• 2017

고정된 정적 이미지 형태의 정보제공자 중심 웹기반 또는 지도 상호작용을 통한 시 공간 연속적 정보제공이 가능하나 시스템의 확장성, 서비스 속도, 비표준 인터넷 웹환경, 사용자 접근성, 시 공간 변동성 표현 등에 제한이 있는 웹 GIS 기반 해양정보제공시스템을 개선하고자 HTML5와 동적 파티클을 이용한 웹기반 해양정보 가시화시스템을 구축하였다. 특히 위성을 통한 시 공간 연속 관측자료와 3차원 수치모델을 통해 생산되는 재분석 및 예측자료는 지리정보 기반의 이질적 대용량의 다차원 연속적 시 공간 변동성을 갖는 해양자료이다. 이에 대한 직관적이고 효과적인 이해와 활용을 위하여 동적 파티클을 이용하여 벡터성분의 해양변수 시공간 변동성 지리정보와 연동하여 가시화 하였고, 차세대 웹 플랫폼 표준인 HTML5와 WebGL, Canvas, D3, Leaflet map등의 오픈 라이브러리를 이용하여 구축된 해양정보 가시화시스템에 대해 소개하고자 한다.

• 한국물환경학회지
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• 제16권4호
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• pp.421-430
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• 2000

To study the distribution and the behavior of trace metals in Kwangyang Bay, surface water samples were collected four times from August 1997 to May 1998 and were analyzed for trace metals (Cd, Co, Cu, Fe, Ni, Pb, Zn) by Atomic Absorption Spectrometer and Inductively Coupled Plasma Mass Spectrometer. Dissolved Co and Fe concentrations were comparatively high near the Seomjin River mouth. Particulate trace metal contents were relatively high near the Sueochun River mouth and near the Yeochun industrial complex. Distribution coefficients ($K_d$; $Lkg^1$) between dissolved and particulate phases of Fe, Pb, Co, Zn, Ni, Cu and Cd were $1.67{\times}10^8$, $1.37{\times}10^6$, $7.25{\times}10^5$, $4.43{\times}10^5$, $1.39{\times}10^5$, $9.1{\times}10^4$ and $1.8{\times}10^4$, respectively. In Kwangyang Bay, particulate trace-metal concentrations were as high as dissolved ones and showed seasonal and geographic variations.

• 한국환경과학회지
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• 제13권5호
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• pp.479-488
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• 2004

Five sediment cores from the tidal flat of artificial Lake Shihwa are analyzed in terms of sedimentology and geochemistry to evaluate the heavy metal contamination and redox condition of surficial sediment following the Shihwa seawall construction. The variability of concentrations of various elements depends on the depositional environment, and reflects the various redox conditions and sediment provenances. The amounts of Ti and Al and their ratio of Ti/ Al with respect to Li clearly indicate that there is an anthropogenic contribution to the surficial sediment. The high concentrations of heavy metals suggest an anthropogenic contribution at ST. 34 and ST. 22. Concentrations of most elements (Cr, Cu, Zn and Pb) are higher near the Shihwa-Banwol industrial complex than in the central part of Lake Shihwa. Concentrations of heavy metal in surficial sediment near the Shihwa-Banwol industrial complex are two to eight times higher than in the center of Lake Shihwa. Enrichment factors (EF), which are normalized by the unpolluted shale, suggests a significant metallic contamination near the Shihwa-Banwol industrial complex (SBIC). The redox condition is divided into two anoxic and mixed oxi $c_oxic zones based on the carbon:sulfur (C/S) ratios of organic matter and elemental relationships. Correlations among geochemical elements Mn, U and Mo are significantly different from site to site, and may therefore be an indicator of the spatial redox condition. Controlling factors for switching anoxic/oxic conditions are thought to be water depth and the differences in industrial effluent supply. The variations of the Cu/Mn ratio in the sediments confirms above mentioned spatial differences of a redox condition in part, and therefore shows a location-dependence redox condition in sediments at four other sites. The redox condition of the surficial sediment characteristics of the Shihwa Lake are controlled by its geographic location and water depth.th.

• 한국환경복원기술학회지
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• 제2권1호
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• pp.38-47
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• 1999

The mixed rural city is adjusting to change by urbanization. The recent landcover change in mixed rural city is an important factor that changes structure and function of regional ecosystem. Landscape ecology is an integrated ecology widely available for environmental science such as nature conservation and sustainable land-use planning. As the concern about environmental quality rises, many studies are trying to create and conservate for biotop. The creation of biotop is related to the plan and management of the effective landuse because the important factor to change the structure and function of ecological area in the country. This study was carried out to establish the foundation of the landuse plan to analyze the change of landuse and to plan the scheme in creating biotop and landuse. We used the approach of ecological landscape and using landscape indices with RS(Remote Sensing) and GIS(Geographic Information System) technology, spatio-temporal variations of areas and distribution of forest patches were examined in the Sunghwan in Chonan from 1985 to 1996. A result of this study showed that the area of forest and paddy decreased by urban sprawl. The size of patch in the forest and agriculture had been smaller and irregular form, heterogeneity of size of forest and agriculture patches within sub-basin was increased, pattern of forest and agriculture patches decreased the corridor and network from 1985 to 1996.

• Parasites, Hosts and Diseases
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• 제51권4호
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• pp.449-452
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• 2013

Taenia pisiformis is one of the most important parasites of canines and rabbits. T. pisiformis cysticercus (the larval stage) causes severe damage to rabbit breeding, which results in huge economic losses. In this study, the genetic variation of T. pisiformis was determined in Sichuan Province, China. Fragments of the mitochondrial cytochrome b (cytb) (922 bp) gene were amplified in 53 isolates from 8 regions of T. pisiformis. Overall, 12 haplotypes were found in these 53 cytb sequences. Molecular genetic variations showed 98.4% genetic variation derived from intra-region. $F_{ST}$ and Nm values suggested that 53 isolates were not genetically differentiated and had low levels of genetic diversity. Neutrality indices of the cytb sequences showed the evolution of T. pisiformis followed a neutral mode. Phylogenetic analysis revealed no correlation between phylogeny and geographic distribution. These findings indicate that 53 isolates of T. pisiformis keep a low genetic variation, which provide useful knowledge for monitoring changes in parasite populations for future control strategies.

• 대기
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• 제27권4호
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• pp.423-433
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• 2017

The spatial and temporal variations in radiative forcing (RF) and mean temperature changes of greenhouse gases (GHGs), such as $CO_2$, $CH_4$, and $N_2O$, were analyzed at urban center (Yeon-dong) and background sites (Gosan) on Jeju Island during 2010~2015, based on a modeling approach (i.e., radiative transfer model). Overall, the RFs and mean temperature changes of $CO_2$ at Yeon-dong during most years (except for 2014) were estimated to be higher than those at Gosan. This might be possibly because of its higher concentrations at Yeon-dong due to relatively large energy consumption and small photosynthesis and also the difference in radiation flux due to the different input condition (e.g., local time and geographic coordinates of solar zenith angle) in the model. The annual mean RFs and temperature changes of $CO_2$ were highest in 2015 ($2.41Wm^{-2}$ and 1.76 K) at Yeon-dong and in 2013 ($2.22Wm^{-2}$ and 1.62 K) at Gosan (except for 2010 and 2011). The maximum monthly/seasonal mean RFs and temperature changes of $CO_2$ occurred in spring (Mar. and/or Apr.) or winter (Jan. and/or Feb.) at the two sites during the study period, whereas the minimum RFs and temperature changes in summer (Jun.-Aug.). In the case of $CH_4$ and $N_2O$, their impacts on the RF and mean temperature changes were very small (an order of magnitude lower) compared to $CO_2$. The spatio-temporal differences in these RF values of GHGs might primarily depend on the atmospheric profile (e.g., ozone profile), surface albedo, local time (or solar zenith angle), as well as their mass concentrations.

• 한국발생생물학회지:발생과생식
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• 제13권2호
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• pp.97-103
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• 2009

Genomic DNA samples isolated from four geographical freshwater crab (Eriocheir sinensis) populations collected in the inland of the Korean Peninsula (Gunsan, Paju, and Nampo) and a Chinese site, were used for PCR amplification. Seven decamer primers generated 19 specific loci (19/243 loci, 7.81%) in the Gunsan population, 32 (32/215 loci, 14.88%) in the Paju population, 19 (19/231 loci, 8.23%) in the Nampo population and 62 (62/340 loci, 18.24%) in a Chinese population. The average 8.9 specific loci exhibited inter-individual-specific characteristics, thus revealing DNA polymorphisms in the Chinese population. The number of unique shared loci to each population and number of shared loci by the four populations were generated by molecular analysis using seven primers in four populations. 35 unique shared loci to each population, with an average of 5.0 per primer, were observed in the Gunsan population, and 50 loci, with an average of 7.1 per primer, were observed in the Chinese population. The hierarchical dendrogram indicates three main branches: cluster 1 (GUNSAN 01$\sim$GUNSAN 05, PAJU 06$\sim$PAJU 10 and NAMPO 11$\sim$NAMPO 15) and cluster 2 (CHINESE 16, 17, 18, 19 and 20). Conclusively individual no. 20 of the PAJU 10 freshwater crab was most distantly related to CHINESE no. 20 (genetic distance = 0.667). Taken together, these results demonstrate the potential of RAPD analysis to identify diagnostic markers for the identification of four freshwater crab populations.

• 한국콘텐츠학회논문지
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• 제11권9호
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• pp.372-383
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• 2011

본 연구의 목적은 관상동맥중재술 입원 환자의 재원일수의 변이를 규명하기 위해 중증도 보정 모형을 개발하였다. 2004~2006년 퇴원손상환자 조사자료 중 관상동맥중재술 입원 환자 1,011건을 연구대상으로 하였으며, 재원일수의 변이분석은 t검정, 분산분석을 실시하였고, 중증도 보정 재원일수 모형은 데이터마이닝 기법을 이용하였다. 개발된 다중회귀분석 모형을 이용하여 예측 재원일수를 산출하고 이를 실제 재원일수와 비교한 결과 병상규모별, 보험유형과 지역별로 재원일수의 변이가 존재하는 것으로 나타났다. 환자 특성과 중증도를 통제하고 나타난 재원일수의 변이는 공급자 요인으로 설명될 수 있는데, 진료행태나 의료자원에 대한 후속 연구가 필요한 것으로 보인다. 본 연구는 행정 데이터를 이용하여 중증도 모형을 개발하고 변이를 확인하였다는 점에서 활용의 효용성을 높이는 데 기여할 것으로 사료된다.

• Spatial Information Research
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• 제5권1호
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• pp.11-26
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• 1997

본 논문은 제2의 금융중심지로 부상하고 있는 강남구를 사례로 GIS 기법을 활용하여 은행점포의 입지를 분석하였다. 금융자율화 이후 급격한 증가추세를 보이고 있는 은행점포의 수는 상당한 지역적인 편재현상을 나타내고 있다. 통계기법을 활용하여 은행 입지에 영향을 주는 입지요인을 추출하였고, 은행이용 고객들에 대한 설문조사를 통하여 은행점포의 상권을 조사하였다. 이러한 기초자료를 바탕으로 하여 GIS기법을 활용하여 입지분석을 실시하였다. 먼저 은행이용고객들에게 최적의 서비스를 공급할 수 있는 목적함수를 토대로한 입지-배분 모델을 적용하여 추출된 입지와 현재의 은행점포의 입지를 비교하였다. 또한 그리드 연산 기법을 활용하여 잠재 수요력과 잠재 공급력의 차이를 통해 앞으로 은행점포의 신규 설립이 가능한 지구를 추출하였다. 본 연구를 통해 GIS기법을 활용하여 입지분석을 실시하는 경우 제한점과 앞으로 해결되어야 할 문제점에 대해 논하였다.