생물서식지로서 지형의 가치평가를 위한 전국자연환경조사 지형조사 고찰

오정식,이재호 한국지형학회 2023 한국지형학회지 Vol.30 No.2

In the last 20 years, geomorphic surveys as a part of the National Ecosystem Survey have investigated various geomorphological resources in Korean Peninsula and documented a database for the systematic conservation and management of the Korean territory. Recently, as the importance of habitats has been focused on, we should pay attention to discussing the methods for habitat-based geomorphic evaluation. The purpose of this study is to analyze the data of the 3rd and 4th National Ecosystem Surveys to provide implications for habitat-based geomorphic evaluation methods and to interest Korean geomorphologists in the discussion of habitat-based evaluation. We extracted spatially overlapping regions from the geomorphic survey results and the distribution data of endangered species using QGIS. We identified a total of 73 geomorphological units where endangered species are distributed, and we conducted an expert survey to identify endangered species that could inhabit the 73 geomorphological units. As a result of this study, we found the following facts. 1) Amphibians and reptiles, terrestrial insects, and flora taxa can be used as key indicators in the evaluation of the habitat of geomorphological units; 2) Eight geomorphological units (i.e., mountain wetland, river cliff, bar, riverine wetland, flood plain, back marsh, lacustrine wetland) with a habitable frequency of endangered species can be separately managed as habitats; 3) An evaluation method can be adaptable, such as additional scores (and/or grades) to the evaluation of geomorphological units in which key species have appeared. We anticipate geomorphic surveys that will enable assessments as habitats instead of current methods with limitations such as evaluation at the landscape level. Furthermore, the result of the habitat-based geomorphic evaluation could be effectively used for categorizing habitats and selecting survey regions in other taxa.

가음단층계의 선형구조 추출과 선형구조와 단층활동의 관련성

오정식 한국지형학회 2019 한국지형학회지 Vol.26 No.2

The purpose of this study is to extract lineaments in the southeastern part of the Gaeum Fault System, and to understand their characteristics and a relationship between them and fault activation. The lineaments were extracted using a multi-layered analysis based on a digital elevation model (5 m resolution), aerial photos, and satellite images. First-grade lineaments inferred as an high-activity along them were classified based on the displacement of the Quaternary deposits and the distribution of fault-related landforms. The results of classifying the first-grade lineaments were verified by fieldwork and electrical resistivity survey. In the study area of 510 km2, a total of 222 lineaments was identified, and their total length was 333.4 km. Six grade lineaments were identified, and their total length was 11.2 km. The lineaments showed high-density distribution in the region along the Geumcheon, Gaeum, Ubo fault, and a boundary of the Hwasan cauldron consisting the Gaeum Fault System. They generally have WNW-ESE trend, which is the same direction with the strike of Gaeum Fault System. Electrical resistivity survey was conducted on eight survey lines crossing the first-grade lineament. A low-resistivity zone, which is assumed to be a fault damage zone, has been identified across almost all survey lines (except for only one survey line). The visual (naked eyes) detecting of the lineament was evaluated to be less objectivity than the automatic extraction using the algorithm. However, the results of electrical resistivity survey showed that first-grade lineament extracted by visual detecting was 83% reliable for inferred fault detection. These results showed that objective visual detection results can be derived from multi-layered analysis based on tectonic geomorphology.

±35kV MVDC 스테이션의 실제 운전에 따른 데이터 분석

오정식,여서현,정인성 조선대학교 공학기술연구원 2023 공학기술논문지 Vol.16 No.3

Recently, interest in direct current transmission systems has increased, but research and demonstration on MVDC are relatively inactive. Since the specifications for the MVDC system have not currently been defined, first introduce the definition, design, and installation status of the MVDC system. And the data generated while actually operating the ±35kV MVDC system was analyzed. It was confirmed that the non-standardized MVDC system operates normally and does not affect the AC system. In the future, plan to verify the various performances of the MVDC system through continuous research.

키르기스스탄 코코메렌강 유역의 대규모 산사태 유형과 지형 발달

오정식 한국지형학회 2019 한국지형학회지 Vol.26 No.1

Large landslide is a type of mass movement that causes drastic landform changes in a short period, and it causes huge human and property damage over a large area. The purpose of this study is to categorize the types and characteristics of large landslides around the Kokomeren River basin, Kyrgyzstan and to discuss the geomorphic development after the large landslides. The topographic analysis about a total of 20 landslides documented collapsed volumes of 0.01 to 1.10 km3, height drops of 180 to 1,770 m, and runout distances of 1,200 to 5,400 m. Rock avalanche and rockslide are identified as major types of large-scale landslides in the study area. Rock avalanches can be divided into P-type, J-type, and S-type based on the features of slope failure and kinematic characteristics of rock debris. Landslide synchronistic landforms such as trimlines, transverse ridges, longitudinal ridges, levees, and hummocks are well developed in the rock avalanche. The pieces of evidence of landslide dam, landslide-dammed lake, and remnant outburst flood deposits are observed in the upstream and downstream where the rockslides occurred. The Ak-Kiol landslide dam is the best example of a geomorphic development due to lake spillover and the large landslides were likely to be triggered by huge paleo-seismic events.

무인항공기를 활용한 고기복지형의 고해상도 수치표고모델 구축과 지형분석

오정식 한국사진지리학회 2019 한국사진지리학회지 Vol.29 No.2

UAV images were taken from the Bituut landslide, located in Gobi-Altay, Mongolia, used to generate an orthophoto and a digital elevation model (DEM) with∼0.15m/pixel resolution. DEM generated from the UAV images shows more precise topographic features with 40 thousand times higher ground sample distance (GSD) than DEM based on SRTM. In particular, landslide-related landforms with low relief and small scales such as hummocks (molard) and linear structures can be clearly identified by carrying out a geomorphic analysis using hillshade based on the generated U-DEM. As a result, this study shows that the UAV-based highly accurate geomorphic analysis can make meaningful result even in steep slope with high relief landforms induced by a large landslides.

Mu-Opioid Receptor Polymorphisms and Breast Cancer in a Korean Female Adult Population: A Retrospective Study

오정식,이승현,유영범,양정현,김성협 한국유방암학회 2016 Journal of breast cancer Vol.19 No.2

Distribution of A118G single nucleotide polymorphism (SNP) in the mu-opioid receptor 1 gene (OPRM1) differs with ethnicity. We assessed the distribution of this SNP in Korean women with breast cancer and compared it with that in women of other ethnicities with breast cancer. Distribution of SNP genotypes was as follows: 49.8% for AG genotype, 40.6% for AA genotype, and 9.6% for GG genotype. Logistic regression analysis showed a negative association between the presence of the G allele at position 118 of OPRM1 and breast cancer in the studied population (odds ratios [OR], 0.635; p=0.002). However, the AG and GG genotypes were not associated with breast cancer in the studied population (OR, 0.719; p=0.130). The proportions of the AG and GG genotypes of the OPRM1 SNP were higher in Korean women with breast cancer than in those of other ethnicities.

지리교육적 활용을 위한 한국지리지 모델 연구

오정식,이승철 국토지리학회 2012 국토지리학회지 Vol.46 No.4

교육의 지역화와 학습자 중심의 능동적 교육활동이 강조되는 최근의 지리교육에서 교육활동에 직·간접적으로 활용되는 지리적 정보의 중요성은 날로 증대되고 있다. 이러한 측면에서 한국지리지는 지리교육의 전문성, 효율성, 수월성 달성을 위해 그 활용 가능성이 큰 교육 자료가 될 수 있다. 따라서 본 연구의 목적은 한국지리지의 교육적 활용 증대를 위한 새로운 역할과 모델을 제안하기 위한 것이다. 이를 위해 본 연구는 현행 지리교육과정의 특성과 기존 한국지리지가 지니는 교육적 활용의 한계점을 분석하였으며, 향후 한국지리지가 갖춰야 할 새로운 모델을 다음과 같이 두 가지 측면에서 논의하였다. 첫째, 지리교육을 위한 한국지리지의 활용 가능성을 더욱 증대시키기 위해 크게 교육 주체별 측면과 각 급 학교의 활용 측면- (1) 교사의 지역 교육 지침서, (2) 학생의 자기 주도적 학습활동 자료, (3) 교과서 개발자의 교과서 개발 지침서 - 에서 한국지리지 역할과 모델을 제안하였다. 둘째, 각 급 학교별 지리 관련 교육과정에서 향후 교육적 목적의 한국지리지 활용성 증대를 위해서 한국지리지는 국토관 함양을 위한 정보, 국토의 보편성과 특수성 이해를 위한 내용, 우리 국토와 세계 여러 나라의 지리적 환경 비교를 위한 내용, 지역 중심의 계통적 지리정보 및 지역의 특수성에 기인한 다양한 지리적 이슈 등이 제시되어야 한다고 제안하였다. Korea geography has played a critical role as a great educational resource which enable to help achieve the speciality, efficiency and excellence of geography education. The main aim of the research is to provide new roles and models of Korea geography for the educational application of geography by analyzing characteristics of geography curriculum and some limits of Korea geography to educational applications in primary and secondary school. To this end, it suggests a new model for Korea geography in two perspectives. In terms of the application body of Korea geography, we suggested Korea geography as a guideline of regional education for teachers, a source of self-directed learning for students and a guideline for the supervision of geography text books, in order to stimulate its application. Also, we argued that Korea geography should deal with some information enable us to enhance land consciousness, contents for comparison between Korea and other world geographies, contents for understanding both geographical universality and distinct, and so on.

만경강 신천습지의 지형 특성과 시공간적 토지피복 변화

오정식,김장수 한국지역지리학회 2021 한국지역지리학회 학술대회발표집 Vol.2021 No.5

가화천 하구역의 지형특성과 서식지로서 지형의 보전과 관리

오정식,탁한명 한국사진지리학회 2022 한국사진지리학회지 Vol.32 No.1

The purpose of this study is to demonstrate the characteristics of morphology and drainage basin environment of the Estuary of Gahwa River and to provide the suggestion of its conservation and management of landforms as an ecological habitat. Gahwa River is a national river with a total length of ∼10.8 km and a drainage basin of ∼ 29.6 km2. River mouth facing Sacheon Bay (the South Sea of Korea) is an open estuary and shows the characteristics of a tidal river in a section ∼4.5 km downstream. Riverbed sediments are mixed with various grain sizes ranging from clay (<0.002 mm) to boulder (>256 mm). Sediments larger than pebble (>4 mm) formed locally sand-gravel bars on each side of the river channel. As a result of grain size analysis, sand accounts for a high ratio (mean. 86.6 %) along the riverbed, and the silt (0.9 to 37.6 %) and clay (2.0 to 9.2 %) contents show a low ratio. These results are caused by the massive discharge (6,000 tons/sec) from the regulating gate of Namgang dam in the summer season. This is because gravel materials are supplied from upstream exposed bedrock riverbed, while clay and silt materials moved by the flood tide are continuously reworked and eroded. Physio-chemical properties of sediments, such as pH, electrical conductivity (EC), and available phosphate (P2O5), depending the channel adjacency and the effect of flood tide inflow. In addition, the low values of organic matter (OM) and cation exchange capacity (CEC) are interpreted as low vegetation coverage and less soil-forming. It is also noteworthy that lead (Pb) was detected in all samples (a total of 13 samples) as a result of the heavy metal analysis. The Estuary of Gahwa River has the characteristics of artificial and natural channels in harmony, and its geodiversity enhances the function and value of an ecological habitat. However, in the long term, more in-depth research is needed on changes in fluvial landforms due to the discharge of regulating gates and pollutants around the drainage basin. Moreover, detailed conservation and management are required considering the role of the river for a spillway and the type of land-use along the river valley.

‘지금 여기’ 돈대, 강화도에서 숨은그림찾기

오정식 인천작가회의(작가들) 2014 작가들 Vol.- No.51