• 제목/요약/키워드: geoscience

검색결과 2,779건 처리시간 0.029초

A Study on the Environment Change of Tidal Flat In the Hampyeong Bay Using Remotely Sensed Data

  • Lee, Hong-Jin;Chi, Kwang-Hoon;Chang, Se-Won
    • 대한원격탐사학회:학술대회논문집
    • /
    • 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
    • /
    • pp.690-690
    • /
    • 2003

  • The purpose of this study is to analyze the geological environment changes of tidal flat in the Hampyeong Bay. Especially, it centers on the changes in the sedimentary environment using remote sensing data. Multi-temporal Landsat data were used in this study. Remote sensing methods can be effectively applied for quantitative analysis of geological environment changes in tidal flat.

  • PDF

낙동강권역의 지하수 산출 유망도 평가 (A Groundwater Potential Map for the Nakdonggang River Basin)

  • 유순영;정재훈;박길택;문희선;석희준;김용철;고동찬;고경석;김형찬;문상호;신제현;심병완;최한나;하규철
    • 한국지하수토양환경학회지:지하수토양환경
    • /
    • 제28권6호
    • /
    • pp.71-89
    • /
    • 2023

  • A groundwater potential map (GPM) was built for the Nakdonggang River Basin based on ten variables, including hydrogeologic unit, fault-line density, depth to groundwater, distance to surface water, lineament density, slope, stream drainage density, soil drainage, land cover, and annual rainfall. To integrate the thematic layers for GPM, the criteria were first weighted using the Analytic Hierarchical Process (AHP) and then overlaid using the Technique for Ordering Preferences by Similarity to Ideal Solution (TOPSIS) model. Finally, the groundwater potential was categorized into five classes (very high (VH), high (H), moderate (M), low (L), very low (VL)) and verified by examining the specific capacity of individual wells on each class. The wells in the area categorized as VH showed the highest median specific capacity (5.2 m3/day/m), while the wells with specific capacity < 1.39 m3/day/m were distributed in the areas categorized as L or VL. The accuracy of GPM generated in the work looked acceptable, although the specific capacity data were not enough to verify GPM in the studied large watershed. To create GPMs for the determination of high-yield well locations, the resolution and reliability of thematic maps should be improved. Criterion values for groundwater potential should be established when machine learning or statistical models are used in the GPM evaluation process.

  • https://doi.org/10.7857/JSGE.2023.28.6.071 인용 PDF HTML

Encapsulated Silicon Nanocrystals Formed in Silica by Ion Beam Synthesis

  • Choi, Han-Woo;Woo, Hyung-Joo;Kim, Joon-Kon;Kim, Gi-Dong;Hong, Wan-Hong;Ji, Young-Yong
    • Bulletin of the Korean Chemical Society
    • /
    • 제25권4호
    • /
    • pp.525-528
    • /
    • 2004

  • The photoluminescence (PL) emission of Si nanocrystals synthesized by 400 keV Si ion implanted in $SiO_2$ is studied as a function of ion dose and annealing time. The formation of nanocrystals at around 600 nm from the surface was confirmed by RBS and HRTEM, and the Si nanocrystals showed a wide and very intense PL emission at 700-900 nm. The intensity of this emission showed a typical behaviour with a fast transitory increase to reach a saturation with the annealing time, however, the red shift increased continuously because of the Ostwald ripening. The oversaturation of dose derived a decrease of PL intensity because of the diminishment of quantum confinement. A strong enhancement of PL intensity by H passivation was confirmed also, and the possible mechanism is discussed.

  • https://doi.org/10.5012/bkcs.2004.25.4.525 인용 PDF KSCI

Detection of Thermal Effluent Discharged from Nuclear Power Plant Using Airborne MSS and Landsat ETM+

  • Han, Joung-Gyu;Chi, Kwang-Hoon;Yeon, Young-Kwang
    • 대한원격탐사학회:학술대회논문집
    • /
    • 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
    • /
    • pp.323-329
    • /
    • 2002

  • The thermal effluent discharged from nuclear power plants can affect the offshore ecosystem change. The ability of measuring sea surface temperature in high resolution with Airborne MSS thermal spectral band(8.5 $\mu$m ~ 12.5 $\mu$m) and Landsat ETM+(10.4$\mu$m ~ 12.5 $\mu$m) gives us an information of spread range of thermal effluent. This information can be used as one of major factors fur analyzing the impact of the fish farm damage around the nuclear power plants. Every season from November 1999, this research has been conducted to investigate the extent of diffusion of thermal effluent discharged from KoRi, UlJin and WolSung Nuclear Power Plant located at the coastline of the East Sea of Korea.

  • PDF