• Journal of Korean Society for Geospatial Information Science
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• v.18 no.4
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• pp.119-129
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• 2010

The joint use of remotely sensed data and field measurements has been widely used to estimate aboveground carbon stock in many countries. Recently, Korea Forest Research Institute has developed new carbon emission factors for kind of tree, thus more accurate estimate is possible. In this study, the aboveground carbon stock of Danyang area in South Korea was estimated using k-Nearest Neighbor(kNN) algorithm with the 5th National Forest Inventory(NFI) data. Considering the spectral response of forested area under the climate condition in Korea peninsular which has 4 distinct seasons, Landsat TM seasonal satellite images were collected. As a result, the estimated total carbon stock of Danyang area was ranged from 3542768.49tonC to 3329037.51tonC but seasonal trends were not found.

• Korean Journal of Food Science and Technology
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• v.37 no.2
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• pp.228-232
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• 2005

Antibacterial, antifungal, anticancer, and ACE inhibitory activities of methanol, ethyl acetate, chloroform, and hexane extracts of garlic were investigated. Methanol extract showed highest yield of 7.9-8.8 brix. Ethyl acetate and chloroform extracts showed strong antibacterial activities as determined by inhibition zone (8-16mm) against B. subtilis and P. aeruginosa, and good antifungal activities as determined by inhibition zone (8-30mm) against A. niger, M. miehei, and T. reesei. Wando, Banyans, Chinese, and Seosan garlic methanol extracts showed 65.6, 60.4, 70.1, and 55.3% ACE inhibitory activities, 42.3, 53.8, 50.4, and 54.5% anticancer activities against SNU-1, and 11.3, 20.2, 36.6, and 30.5% anticancer activities against HeLa, respectively.

• Economic and Environmental Geology
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• v.25 no.2
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• pp.179-190
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• 1992

The Yeongchun area is located at the central part of the Danyang Coalfield, where Precambrian granitoids, Cambro-Ordovician Choseon Supergroup, Carboniferous-early Triassic Pyeongan Supergroup, middle Triassic-Jurassic Bansong Group and extrusive tuffs are exposed. The rocks in the area underwent four phases of deformation, which are (a) $D_1$ : Movement of the Okdong Fault, (b) $D_2$ : Formation of NW-SE trending folds and stretching lineations, (c) $D_3$: Movement of the Gagdong Thrust Fault and associated structures of NNE-SSW trending folds, and (d) $D_4$ : E-W trending strike-slip faults and folds. During the $D_3$-event, flexural slip deformation intensively affected rocks in the area. Strain measurements show relatively low strain intensity in the area. The types of strain ellipsoid are prolate in the hangingwall area and those near to the footwall area range from plane strain to weak oblate. The oblate type is developed in the region far from the footwall area.

• The Journal of the Petrological Society of Korea
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• v.28 no.2
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• pp.143-156
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• 2019

We carried out the sensitive high resolution ion microprobe zircon U-Pb age dating and whole rock geochemical analysis of granites in the Gudambong and Sainam geosites, Danyang Geopark. The granites crop out in the western and southern parts of Danyang County, and intruded sedimentary successions of the Yeongweol and Taebaek Groups, respectively. The U-Pb isotopic compositions of zircon from the Gudambong and Sainam granite samples yielded the Cretaceous intrusion ages of $90.4{\pm}0.5Ma(t{\sigma})$ and $90.0{\pm}1.5Ma(t{\sigma})$, respectively. The major and trace elements compositions of the samples showed an affinity of typical A-type granite, indicating their petrogenesis during the late stage of the Bulguksa orogeny or a tectonic dormancy. The geochronologic and geochemical results are identical to those of granites previously reported from the Cretaceous Muamsa and Wolaksan suites.

• The Journal of Engineering Geology
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• v.33 no.3
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• pp.427-438
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• 2023

We carried out a geological survey to classify the types of mass movement in Danyang Geopark (where various rock types are distributed) and analyzed the mechanical and hydraulic characteristics of landslide materials using a series of laboratory tests. Debris flows occurred in areas of limestone/marble, shale, and porphyroblastic gneiss, and limestone/marble landslides were distinguished from the others through the presence of karren topography. Soil tests showed that soil derived from weathered gneiss, which has a higher proportion of coarse grains, has a higher friction angle, lower cohesion, and larger hydraulic conductivity than soils from areas of limestone/marble, and shale. Rock failure mass movements occurred in areas of phyllite, sandstone, and conglomerate and were subdivided into plane failure, block-fall, and boulder-fall types in areas of phyllite, sandstone, and conglomerate, respectively. The shear strength of phyllite is much lower than that of the other types of rock, which have similar rock quality. The slake durability index of the conglomerate is similar to that of the other rock types, which have similar degrees of weathering, but differential weathering of the matrix and clasts was clearly observed when comparing the samples before and after the test. This study can help establish appropriate reinforcement and disaster prevention measures, which depend on the type of mass movement expected given the geological characteristics of an area.

• Journal of the Korean GEO-environmental Society
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• v.24 no.12
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• pp.31-38
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• 2023

In this study, runoff characteristics analysis was conducted as a basic research to establish a forecasting and warning system for flood risk areas in small mountainous basins in South Korea. The Danyang 1 Bridge basin located in Danyang-gun, Chungcheongbuk-do was selected as the study basin, and the watershed characteristic factors were calculated using Q-GIS based on the digital elevation model (DEM) of the basin. In addition, nine heavy rainfall events were selected from 2020 to 2023 using hydrometeorological data provided by the National Water Resources Management Comprehensive Information System. HEC-HMS rainfall-runoff model was used to analyze the runoff characteristics of small mountainous basins, and rainfall-runoff model simulation was performed by reflecting 9 heavy rainfall events and calculated basin characteristic factors. Based on the rainfall-runoff model, parameter optimization was performed for six heavy rain events with large error rates among the simulated events, and the appropriate parameter range for the Danyang 1 Bridge basin, a small mountainous basin, was calculated to be 0.8 to 3.4. The results of this study will be utilized as foundational data for establishing flood forecasting and warning systems in small mountainous basin, and further research will be conducted to derive the range of parameters according to basin characteristics.

• Journal of the Speleological Society of Korea
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• v.23 no.24
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• pp.73-106
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• 1990

노동굴은 1979년 6월 18일에 우리나라 천연기념물 제262호로 지정된 석회동굴이다. 노동(제일)동굴로 불리우는 이 동굴은 석회동굴의 보고지대인 충북단양에서 우리나라에서는 손꼽는 자연경관을 자랑하는 관광동굴로 공개되고 있다. 이제 이와같이 소중한 자연자원의 보고인 이 노동굴의 환경을 조사하고 이 동굴이 지니고 있는 동굴환경실태에 따른 적절한 환경보전 대책의 방안을 제시하여 앞으로의 노동굴의 영원한 관리유지를 위한 자료로 제공하고자 하는 바이다.(중략)

• Journal of the Speleological Society of Korea
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• v.33 no.34
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• pp.23-29
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• 1993

온달굴은 충청북도 단양군 영춘면 하리에 소재하며 남한강이 서남류하여 굽이치는 남안의 남산 기음에 위치한다. 이 남산은 서남쪽에 하리와 박자리의 경계를 이루고 있는 남한강변에 우뚝솟은 해발고도 427m 성산의 기슭에 해당하는 구릉봉으로 석회암 지대의 산지지형인 급경사의 산세를 이루고 있다. 영춘지역의 남산 산마루를 따라 성산으로 오르면 산정 부근에서 능선을 따라 그 유명한 성산고성이 축조되어 있다. 이것이 현재 온달성으로 불리우고 있는 고성이다.(중략)

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.277-279
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• 2007

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.646-648
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• 2007