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TOWARD A NEXT GENERATION SOLAR CORONAGRAPH: DIAGNOSTIC CORONAGRAPH EXPERIMENT
Cho, Kyung-Suk,Yang, Heesu,Lee, Jae-Ok,Bong, Su-Chan,Kim, Jihun,Choi, Seonghwan,Park, Jongyeob,Cho, Kyuhyoun,Baek, Ji-Hye,Kim, Yeon-Han,Park, Young-Deuk The Korean Astronomical Society 2020 Journal of The Korean Astronomical Society Vol.53 No.4
The Korea Astronomy and Space Science Institute (KASI) has been developing a next-generation coronagraph (NGC) in cooperation with NASA to measure the coronal electron density, temperature, and speed simultaneously, using four different optical filters around 400 nm. KASI organized an expedition to demonstrate the coronagraph measurement scheme and the instrumental technology during the 2017 total solar eclipse (TSE) across the USA. The observation site was in Jackson Hole, Wyoming, USA. We built an eclipse observation system, the Diagnostic Coronal Experiment (DICE), composed of two identical telescopes to improve the signal-to-noise ratio. The observation was conducted at four wavelengths and three linear polarization directions in the limited total eclipse time of about 140 seconds. We successfully obtained polarization data for the corona but we were not able to obtain information on the coronal electron temperature and speed due to the low signal-to-noise ratio of the optical system and strong emission from prominences located at the western limb. In this study, we report the development of DICE and the observation results from the eclipse expedition. TSE observation and analysis with our self-developed instrument showed that a coronagraph needs to be designed carefully to achieve its scientific purpose. We gained valuable experience for future follow-up NASA-KASI joint missions: the Balloon-borne Investigation of the Temperature and Speed of Electrons in the Corona (BITSE) and the COronal Diagnostic EXperiment (CODEX).
Cho, Jin-Gyeong,Song, Na-Young,Nam, Tae-Gyu,Shrestha, Sabina,Park, Hee-Jung,Lyu, Ha-Na,Kim, Dae-Ok,Lee, Gihwan,Woo, Young-Min,Jeong, Tae-Sook,Baek, Nam-In American Chemical Society 2013 Journal of agricultural and food chemistry Vol.61 No.43
<P>The transgenic rice cultivar of Oryza sativa spp. <I>japonica</I> cv. Hwa-Young, C1/R-S transgenic rice (C1/R-S rice), is a flavonoid-rich cultivar of rice. The grains of C1/R-S rice were extracted with aqueous MeOH, and the concentrated extract was partitioned with EtOAc, <I>n</I>-BuOH, and H<SUB>2</SUB>O, successively. Repeated silica gel, octadecyl silica gel (ODS), and Sephadex LH-20 column chromatographies for the EtOAc and <I>n</I>-BuOH fractions afforded four new flavonoids (compounds <B>2</B>, <B>3</B>, <B>7</B>, and <B>8</B>) along with four known flavonoids: (+)-3′-<I>O</I>-methyltaxifolin (<B>1</B>), brassicin (<B>4</B>), isorhamnetin-4′-<I>O</I>-β-<SMALL>d</SMALL>-glucosyranoside (<B>5</B>), and 3′-<I>O</I>-methyltaxifolin-5-<I>O</I>-β-<SMALL>d</SMALL>-glucopyranoside (<B>6</B>). The new flavonoids were identified as 3′-<I>O</I>-methyltaxifolin-7-<I>O</I>-β-<SMALL>d</SMALL>-glucopyranoside (<B>2</B>), 3′-<I>O</I>-methyltaxifolin-4′-<I>O</I>-β-<SMALL>d</SMALL>-glucopyranoside (<B>3</B>), isorhamnetin-7-<I>O</I>-β-<SMALL>d</SMALL>-cellobioside (brassicin-4″-<I>O</I>-β-<SMALL>d</SMALL>-glucopyranoside) (<B>7</B>), and brassicin-4′-<I>O</I>-β-<SMALL>d</SMALL>-glucosyranoside (<B>8</B>) from the result of spectroscopic data including nuclear magnetic resonance spectrometry (NMR), mass spectrometry (MS), and infrared spectroscopy (IR). Also, quantitative analysis of major flavonoids (compounds <B>2</B>, <B>3</B>, and <B>8</B>) in C1/R-S rice, <I>O. sativa</I> spp. <I>japonica</I> cv. Hwa-Young (HY), and a hybrid of two cultivar (C1/R-S rice/HY) extracts was performed using HPLC experiment. The isolated flavonoids were evaluated for their radical-scavenging effect on DPPH and ABTS radicals.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2013/jafcau.2013.61.issue-43/jf403072c/production/images/medium/jf-2013-03072c_0003.gif'></P>
Cho, Hee Kyung,Kim, So-Yeon,Choi, Mi Jung,Baek, Seung Ok,Kwak, Sang Gyu,Ahn, Sang Ho The Korean Neurosurgical Society 2016 Journal of Korean neurosurgical society Vol.59 No.2
Objective : Lumbar disc herniation can induce sciatica by mechanical compression and/or chemical irritation. The aim of this study was to compare the effects of GCSB-5 (Shinbaro$^{(R)}$) and NSAIDs on pain-related behavior and on the expressions of microglia, astrocytes, CGRP, TRPV1, IL-6, and CX3CL1 in a rat model of lumbar disc herniation. Methods : 112 male Sprague-Dawley rats underwent implantation of nucleus pulposus to a dorsal root ganglion (DRG). Rats were divided into five groups as follows; a saline group (the vehicle control group) (n=27), a 10 mg/kg aceclofenac group (the aceclofenac group) (n=22), and 100, 300 or 600 mg/kg GCSB-5 groups (the GCSB-5 100, 300, or 600 groups) (n=21 for each group). Rats were tested for mechanical allodynia at 3 days after surgery and at 1 day, 3 days, 7 days, 14 days, 21 days, 28 days, 35 days, 42 days, 49 days, and 56 days after treatment commencement. Immunohistochemical staining of microglia (Iba1), astrocytes (GFAP), CGRP, and TRPV1, and PCR for IL-6 and CX3CL1 were performed on spinal dorsal horns and DRGs at 56 days after medication commencement. Results : After 56 days of GCSB-5 300 administration, mechanical withdrawal thresholds were significantly increased (p<0.05), and immunohistochemical expressions of Iba1, GFAP, CGRP, and TRPV1 were reduced than other groups, but this difference was not statistically significant. Conclusion : These results indicate GCSB-5 reduces mechanical allodynia and downregulates neuroglial activity and the expressions of CGRP and TRPV1 in the spinal segments of a rat model of lumbar disc herniation.
Battery Charge and Discharge Characterisitcs in Small Scaled Photovoltaic System
Cho, Geum-Bae,Baek, Hyung-Lae,Choi, Youn-Ok CHOSUN UNIVERSITY 1997 Basic Science and Engineering Vol.1 No.2
In any photovoltaic system, a battery storage system is needed to save some extra power and to meet the required power by load, likely, in a cloudy days or night time. Especially, for a small scale photovoltaic(PV) system in household load application, the battery storage system has a very important role for continuos power supply to household loads in night time. Even though a battery storage system help to improve the availability of solar power, the total availability of the solar power can be restricted to around 80% due to its ingerent losses involving in evergy transformation; charging and discharging chemical reactions. nowadays, the operating efficiency and performance are treated as so important factors in order to evaluate the PV system economially. This paper describes charge and discharge characteristics of a small scale PV system under controlling of a new and simple battery management system. This battery management system is composite controller having a voltage comparator, a power MOSFET switch and accessary instead of conventional relay switching devices. Experimental results show that the proposed battery management system is superior the conventional relay switching system in its the operating performance and the system reliability of the small scale PV system.