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  1. No Access

    Article

    Mass density of the upper atmosphere derived from Starlette’s Precise Orbit Determination with Satellite Laser Ranging

    The atmospheric mass density of the upper atmosphere from the spherical Starlette satellite’s Precise Orbit Determination is first derived with Satellite Laser Ranging measurements at 815 to 1115 km during str...

    H. S. Jeon, S. Cho, Y. S. Kwak, J. K. Chung, J. U. Park… in Astrophysics and Space Science (2011)

  2. No Access

    Article

    Low latitude E-region irregularities studied using Gadanki radar, ionosonde and in situ measured electron density

    In this paper, we attempt to identify the driving forces responsible for the generation of low-latitude E-region field-aligned irregularities (FAIs). It is evident that the low-latitude E-region FAIs occur bot...

    D. V. Phani Kumar, A. K. Patra, Y.-S. Kwak, K.-H. Kim… in Astrophysics and Space Science (2009)

  3. Article

    Open Access

    Comparison between the KOMPSAT-1 drag derived density and the MSISE model density during strong solar and/or geomagnetic activities

    We have compared the KOrea Multi-Purpose SATellite-1 (KOMPSAT-1) drag derived density with the MSISE model (NRLMSISE-00 and MSISE-90) density during strong solar and/or geomagnetic activities. It is well known...

    J. Park, Y.-J. Moon, K.-H. Kim, K.-S. Cho, H.-D. Kim… in Earth, Planets and Space (2008)

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  4. No Access

    Chapter

    Effects of Metallic Impurities upon thin Gate Oxide Integrity and Related Bulk Properties in CZ Si

    In this study, we investigated effects of various well-known metallic impurities such as Fe, Cu, and Al (contaminated by a spin coating method with concentration levels ranged from 1 × 1010 to 1 × 1010 atoms/cm2)...

    K.-C. Cho, J.-G. Park, Y.-S. Kwak, D.-J. Lee… in The Physics and Chemistry of SiO2 and the … (1993)

  5. No Access

    Chapter

    Effects of D-Defects in CZ Silicon Upon Thin Gate Oxide Integrity

    In this study, using oxide breakdown voltage and time-dependent-dielectric breakdown measurements, thermal wave modulated reflectance (both map** and imaging modes), positron annihilation spectroscopy and ch...

    J.-G. Park, S.-P. Choi, G.-S. Lee… in The Physics and Chemistry of SiO2 and the … (1993)

  6. No Access

    Article

    Effects of Silicon Ion Implantation Upon Thin Gate Oxide Integrity

    In this study, using oxide breakdown voltage and time-dependent-dielectric breakdown measurements, thermal wave modulated reflectance and chemical etching/optical microscopy, we investigated effects of Si ion ...

    G. -S. Lee, J. -G. Park, S. -P. Choi, C. -H. Shin… in MRS Online Proceedings Library (1992)

  7. No Access

    Article

    Investigation of Metal Induced Surface Defects in Czochralski Si Following Rapid Thermal Processing by Thermal Wave Modulated Reflectance Method

    Using thermal wave map** and imaging techniques in conjunction with x-ray transmission topography and transmission electron microscopy, precipitation behavior of various fast and slowly diffusing metallic im...

    S. Hahn, W. L Smith, H. Suga, J. -G. Park, C. -S. Lim… in MRS Online Proceedings Library (1991)

  8. No Access

    Chapter

    Effect of Mesenchyme Suppressive Drugs on Sclerogenesis in Animal Models

    There have been many studies utilizing various drugs in animal models to learn if the cause of experimental atherosclerosis can be modified by these therapeutic agents. Corticosteroid, (Bailey and Butler, 1966...

    K. T. Lee, W. M. Lee, Y. S. Kwak in International Symposium State of Preventio… (1978)

  9. No Access

    Chapter and Conference Paper

    Methods to Accelerate Regression

    In recent years, several studies have shown that diet-induced proliferative uncomplicated atherosclerotic lesions regress after removal of the dietary stimulus Such regression has been reported in monkeys (Arm...

    K. T. Lee, A. S. Daoud, Y. S. Kwak in Atherosclerosis IV (1977)

  10. No Access

    Chapter

    Study of Drugs Affecting Cholesterol-Induced Atherosclerosis in Rabbits

    Studies in man and animal models reveal that the major events involved in early atherogenesis include lipid deposition and degeneration and proliferation of smooth muscle cells or mesenchymal cells in the inti...

    Y. S. Kwak, K. T. Lee, D. N. Kim in Atherosclerosis Drug Discovery (1976)