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SIMULATION OF COSMIC MICROWAVE BACKGROUND POLARIZATION FIELDS FOR AMiBA EXPERIMENT
PARK CHAN-GYUNG,PARK CHANGBOM The Korean Astronomical Society 2002 Journal of The Korean Astronomical Society Vol.35 No.2
We have made a topological study of cosmic microwave background (CMB) polarization maps by simulating the AMiBA experiment results. A ACDM CMB sky is adopted to make mock interferometric observations designed for the AMiBA experiment. CMB polarization fields are reconstructed from the AMiBA mock visibility data using the maximum entropy method. We have also considered effects of Galactic foregrounds on the CMB polarization fields. The genus statistic is calculated from the simulated Q and U polarization maps, where Q and U are Stokes parameters. Our study shows that the Galactic foreground emission, even at low Galactic latitude, is expected to have small effects on the CMB polarization field. Increasing survey area and integration time is essential to detect non-Gaussian signals of cosmological origin through genus measurement.
Roles of Dark Energy Perturbations in Dynamical Dark Energy Models: Can We Ignore Them?
Park, Chan-Gyung,Hwang, Jai-chan,Lee, Jae-heon,Noh, Hyerim American Physical Society 2009 Physical Review Letters Vol.103 No.15
<P>We show the importance of properly including the perturbations of the dark energy component in the dynamical dark energy models based on a scalar field and modified gravity theories in order to meet with present and future observational precisions. Based on a simple scaling scalar field dark energy model, we show that observationally distinguishable substantial differences appear by ignoring the dark energy perturbation. By ignoring it the perturbed system of equations becomes inconsistent and deviations in (gauge-invariant) power spectra depend on the gauge choice.</P>
강지은,박상곤,김경남,임현성,박준옥,홍찬표,박치영,정춘해 朝鮮大學校 附設 醫學硏究所 2002 The Medical Journal of Chosun University Vol.27 No.2
Thymoma is the most common tumor of the anterior mediastinum and often associated with autoimmune diseases including myasthenia gravis, systemic lupus erythematosus, hypogammaglobultnemia, agranulocytosis, pure red cell aplasia and aplastic anemia. Aplastic anemia is a rare complication of thymoma and is properly documented in only few cases. Here, we report the case of 61-year-old patient who was found simultaneously to have a thymoma on anterior mediastinum and pancytopenia due to aplastic anemia and have been treated for myasthenia gravis since seventeen years ago.