1,749 research outputs found
The Role of Non-State Actors in the Formation and Evolution of the Regime on Food Aid to North Korea: The Case Study of the National Agricultural Cooperative Federation (NACF) in South Korea
早稲田大学博士(学術)早大学位記番号:新9363doctoral thesi
Proto-type installation of a double-station system for the optical-video-detection and orbital characterisation of a meteor/fireball in South Korea
We give a detailed description of the installation and operation of a
double-station meteor detection system which formed part of a research &
education project between Korea Astronomy Space Science Institute and Daejeon
Science Highschool. A total of six light-sensitive CCD cameras were installed
with three cameras at SOAO and three cameras at BOAO observatory. A
double-station observation of a meteor event enables the determination of the
three-dimensional orbit in space. This project was initiated in response to the
Jinju fireball event in March 2014. The cameras were installed in
October/November 2014. The two stations are identical in hardware as well as
software. Each station employes sensitive Watec-902H2 cameras in combination
with relatively fast f/1.2 lenses. Various fields of views were used for
measuring differences in detection rates of meteor events. We employed the
SonotaCo UFO software suite for meteor detection and their subsequent analysis.
The system setup as well as installation/operation experience is described and
first results are presented. We also give a brief overview of historic as well
as recent meteor (fall) detections in South Korea. For more information please
consult http://meteor.kasi.re.kr .Comment: Technical/instrumentation description of a professional meteor
detection system, 23 pages, 20 figures (color/monochrome), 5 tables,
submitted to the Journal of Korean Astronomical Society (JKAS,
http://jkas.kas.org/, http://jkas.kas.org/history.html
Apoptotic action of botulinum toxin on masseter muscle in rats: early and late changes in the expression of molecular markers
Bocavirus Infection in Hospitalized Children, South Korea
This study presents the first evidence of human bocavirus infection in South Korean children. The virus was detected in 27 (8.0%) of 336 tested specimens, including 17 (7.5%) of 225 virus-negative specimens, collected from children with acute lower respiratory tract infection
Measurement of Planetary Boundary Layer Winds with Scanning Doppler Lidar
The accurate measurement of wind profiles in the planetary boundary layer (PBL) is important not only for numerical weather prediction, but also for air quality modeling. Two wind retrieval methods using scanning Doppler light detection and ranging (lidar) measurements were compared and validated with simultaneous radiosonde soundings. A comparison with 17 radiosonde sounding profiles showed that the sine-fitting method was able to retrieve a larger number of data points, but the singular value decomposition method showed significantly smaller bias (0.57 m s(-1)) and root-mean-square error (1.75 m s(-1)) with radiosonde soundings. Increasing the averaging time interval of radial velocity for obtaining velocity azimuth display scans to 15 min resulted in better agreement with radiosonde soundings due to the signal averaging effect on noise. Simultaneous measurements from collocated wind Doppler lidar and aerosol Mie-scattering lidar revealed the temporal evolution of PBL winds and the vertical distribution of aerosols within the PBL
Immunohistochemical Study of So-called Sclerosing Hemangioma of the Lung
The origin of tumor cells composing sclerosing hemangioma of the lung
has been extensively studied by many researchers, but it is still obscure. We analyzed
seven cases of sclerosing hemangioma of the lung from the files of Seoul National University
Hospital, Department of Pathology by immunohistochemical staining as well as
histologic observation. The tumors are composed of two kinds of cells; the epithelial
cells lining the papillary area are cytokeratin( +) and vimentinl -), while subepithelial
tumor cells are cytokeratin( -) and vimentinl +). Two kinds of cells are separated by
basement membrane, visualized by type IV collagen monoclonal antibody. The angiomatous
and solid areas are devoid of cytokeratin( +) epithelial cells and basement
membrane is not formed beneath the blood-filled cysts. The epitheial cells are frequently
seen at the periphery of the tumor, where the epithelial cells maintain their
pseudostratified and ciliated character of bronchiolar lining epithelium. The above
findings suggest that the epithelial cells would not be tumor cells but an entrapped mucosa,
and that the tumor cells be not of epithelial origin
Optimal Design of a New Wheeled Mobile Robot by Kinetic Analysis for the Stair-Climbing States
Pole-skipping points in 2D gravity and SYK model
We represent the first investigation of pole-skipping on both the gravity and
field theory sides. In contrast to the higher dimensional models, there is no
momentum degree of freedom in dimensional bulk theory. Thus, we then
consider a scalar field mass as our degree of freedom for the pole-skipping
phenomenon instead of momentum. The pole-skipping frequencies of the scalar
field in 2D gravity are the same as higher dimensional cases: for positive integer . At each of these frequencies, there is a
corresponding pole-skipping mass, so the pole-skipping points exist in the
space. We also compute the pole-skipping points of the SYK model
in space where is the dimension of the bilinear primary
operator. We find that there is a one-to-one correspondence of the
pole-skipping points between the JT gravity and the SYK model. To obtain the
pole-skipping points, we need to consider the parameter related to
chemical potential on the horizon of charged JT gravity and the particle-hole
asymmetric parameter of the complex SYK model as shift
parameters. This highlights the correspondence in
relation to pole-skipping
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