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Chronic gastrointestinal symptoms and quality of life in the Korean population.
Jeong, Jeong-Jo,Choi, Myung-Gyu,Cho, Young-Seok,Lee, Seung-Geun,Oh, Jung-Hwan,Park, Jae-Myung,Cho, Yu-Kyung,Lee, In-Seok,Kim, Sang-Woo,Han, Sok-Won,Choi, Kyu-Yong,Chung, In-Sik WJG Press 2008 WORLD JOURNAL OF GASTROENTEROLOGY Vol.14 No.41
<P>To evaluate the prevalence of chronic gastrointestinal symptoms and their impact on health-related quality of life (HRQOL) in the Korean population.</P>
Detector Mount Design for IGRINS
Oh, Jae Sok,Park, Chan,Cha, Sang-Mok,Yuk, In-Soo,Park, Kwijong,Kim, Kang-Min,Chun, Moo-Young,Ko, Kyeongyeon,Oh, Heeyoung,Jeong, Ueejeong,Nah, Jakyoung,Lee, Hanshin,Jaffe, Daniel T. The Korean Space Science Society 2014 Journal of Astronomy and Space Sciences Vol.31 No.2
The Immersion Grating Infrared Spectrometer (IGRINS) is a near-infrared wide-band high-resolution spectrograph jointly developed by the Korea Astronomy and Space Science Institute and the University of Texas at Austin. IGRINS employs three HAWAII-2RG Focal Plane Array (H2RG FPA) detectors. We present the design and fabrication of the detector mount for the H2RG detector. The detector mount consists of a detector housing, an ASIC housing, a Field Flattener Lens (FFL) mount, and a support base frame. The detector and the ASIC housing should be kept at 65 K and the support base frame at 130 K. Therefore they are thermally isolated by the support made of GFRP material. The detector mount is designed so that it has features of fine adjusting the position of the detector surface in the optical axis and of fine adjusting yaw and pitch angles in order to utilize as an optical system alignment compensator. We optimized the structural stability and thermal characteristics of the mount design using computer-aided 3D modeling and finite element analysis. Based on the structural and thermal analysis, the designed detector mount meets an optical stability tolerance and system thermal requirements. Actual detector mount fabricated based on the design has been installed into the IGRINS cryostat and successfully passed a vacuum test and a cold test.
Detector Mount Design for IGRINS
Jae Sok Oh,Chan Park,Sang-Mok Cha,In-Soo Yuk,Kwijong Park,Kang-Min Kim,Moo-Young Chun,Kyeongyeon Ko,Heeyoung Oh,Ueejeong Jeong,Jakyoung Nah,Hanshin Lee,Daniel T. Jaffe 한국우주과학회 2014 Journal of Astronomy and Space Sciences Vol.31 No.2
The Immersion Grating Infrared Spectrometer (IGRINS) is a near-infrared wide-band high-resolution spectrograph jointly developed by the Korea Astronomy and Space Science Institute and the University of Texas at Austin. IGRINS employs three HAWAII-2RG Focal Plane Array (H2RG FPA) detectors. We present the design and fabrication of the detector mount for the H2RG detector. The detector mount consists of a detector housing, an ASIC housing, a Field Flattener Lens (FFL) mount, and a support base frame. The detector and the ASIC housing should be kept at 65 K and the support base frame at 130 K. Therefore they are thermally isolated by the support made of GFRP material. The detector mount is designed so that it has features of fine adjusting the position of the detector surface in the optical axis and of fine adjusting yaw and pitch angles in order to utilize as an optical system alignment compensator. We optimized the structural stability and thermal characteristics of the mount design using computer-aided 3D modeling and finite element analysis. Based on the structural and thermal analysis, the designed detector mount meets an optical stability tolerance and system thermal requirements. Actual detector mount fabricated based on the design has been installed into the IGRINS cryostat and successfully passed a vacuum test and a cold test.
THREE-DIMENSIONAL SHOCK STRUCTURE OF THE ORION KL OUTFLOW WITH IGRINS
Oh, Heeyoung,Pyo, Tae-Soo,Kaplan, Kyle,Yuk, In-Soo,Park, Byeong-Gon,Mace, Gregory,Park, Chan,Chun, Moo-Young,Pak, Soojong,Kim, Kang-Min,Oh, Jae Sok,Jeong, Ueejeong,Yu, Young Sam,Lee, Jae-Joon,Kim, Hwi American Astronomical Society 2016 The Astrophysical journal Vol.833 No.2
<P>We report a study of the three-dimensional (3D) outflow structure of a 15 '' x 13 '' area around the H-2 peak 1 in Orion KL with slit-scan observations (13 slits) using the Immersion Grating Infrared Spectrograph. The datacubes have a high-velocity resolution (similar to 7.5 km s(-1)), provide high-contrast imaging within ultra-narrow bands, and enable the detection of the main stream of the previously reported H2 outflow fingers. We identified 31 distinct fingers in the H-2 1-0 S(1) lambda 2.122 mu m emission. The line profile at each finger shows multiple-velocity peaks with a strong low-velocity component around the systemic velocity at V-LSR = +8 km s(-1) and high-velocity emission (|V-LSR| = 45-135 km s(-1)), indicating a typical bow-shock. The observed radial velocity gradients of similar to 4 km s(-1) arcsec(-1) agree well with the velocities inferred from large-scale proper motions, where the projected motion is proportional to the distance from a common origin. We construct a conceptual 3D map of the fingers with estimated inclination angles of 57 degrees-74 degrees. The extinction difference (Delta A(v) > 10 mag) between blueshifted and redshifted fingers indicates high internal extinction. The extinction, the overall angular spread, and the scale of the flow argue for an ambient medium with a very high density (10(5)-10(6) cm(-3)), consistent with molecular line observations of the Orion Molecular Cloud core. The radial velocity gradients and the 3D distributions of the fingers together support the hypothesis of a simultaneous radial explosion of the Orion KL outflow.</P>
CELLULAR ALGEBRAS AND CENTERS OF HECKE ALGEBRAS
Jeong, Yeon-Kwan,Lee, In-Sok,Oh, Hyekyung,Park, Kyung-Hwan Korean Mathematical Society 2002 대한수학회보 Vol.39 No.1
In this short note, we find bases of the centers of generic Hecke algebras associated with certain finite Coxeter groups. Our bases are described using the notion of cell datum of Graham and Lehrer, and the notion of norm.
Long pulse beam extraction with a prototype ion source for the KSTAR neutral beam system
Oh, Byung-Hoon,Chang, Doo-Hee,Jeong, Seung Ho,Lee, Kwang-Won,In, Sang-Ryul,Yoon, Byung-Joo,Seo, Min-Seok,Jin, Jung-Tae,Kim, Bum-Ryul,Chang, Dae-Sik,Jung, Ki-Sok,Kim, Jinchoon,Kim, Tae-Seong,Bae, Young American Institute of Physics 2008 Review of scientific instruments Vol.79 No.2
<P>Long pulse operational characteristics of the high current ion source for the KSTAR neutral beam system are described. The beam pulse length of 300 s was successfully operated at a beam power of 1.6 MW with a beam energy of 70 keV. Beam energy, beam current, beam divergence, arc power, and several other operational parameters were measured during a pulse to analyze the long pulse properties. The increase of the cooling water temperature of the accelerator grids and plasma generator components were measured by water flow calorimetric system using thermocouples. The temperature rises of the filament electrodes of the ion source and the G1 grids (plasma grids) of the accelerator turned out to be the critical factors of the long pulse operation in the current system.</P>
IGRINS NEAR-IR HIGH-RESOLUTION SPECTROSCOPY OF MULTIPLE JETS AROUND LkH<i>α</i>234
Oh, Heeyoung,Pyo, Tae-Soo,Yuk, In-Soo,Park, Byeong-Gon,Park, Chan,Chun, Moo-Young,Pak, Soojong,Kim, Kang-Min,Oh, Jae Sok,Jeong, Ueejeong,Yu, Young Sam,Lee, Jae-Joon,Kim, Hwihyun,Hwang, Narae,Kaplan, K American Astronomical Society 2016 The Astrophysical journal Vol.817 No.2
<P>We present the results of high-resolution near-IR spectroscopy toward the multiple outflows around the Herbig Be star LkH alpha 234 using the Immersion Grating Infrared Spectrograph. Previous studies indicate that the region around LkHa 234 is complex, with several embedded young stellar objects and the outflows associated with them. In simultaneous H- and K-band spectra from HH 167, we detected 5 [Fe II] and 14 H-2 emission lines. We revealed a new [Fe II] jet driven by radio continuum source VLA 3B. Position-velocity diagrams of the H-2 1-0 S(1) lambda 2.122 mu m line show multiple velocity peaks. The kinematics may be explained by a geometrical bow shock model. We detected a component of H-2 emission at the systemic velocity (V-LSR = -10.2 km s(-1)) along the whole slit in all slit positions, which may arise from the ambient photodissociation region. Low-velocity gas dominates the molecular hydrogen emission from knots A and B in HH 167, which is close to the systemic velocity; [Fe II] emission lines are detected farther from the systemic velocity, at V-LSR = -100--130 km s(-1). We infer that the H-2 emission arises from shocked gas entrained by a high-velocity outflow. Population diagrams of H-2 lines imply that the gas is thermalized at a temperature of 2500-3000 K and the emission results from shock excitation.</P>