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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).
의약품 광고심의 기준 및 절차 개선을 위한 전문가 의견 조사
김지현(Jihyun Kim), 조우연(Wooyeon Cho), 신성환(Seonghwan Shin), 박지우(Jeewoo Park), 김주경(Ju Kyoung Kim), 정재훈(Jae-Hoon Cheong), 전하림(Ha-Lim Jeon) 한국보건사회약료경영학회 2023 한국보건사회약료경영학회지 Vol.11 No.1
BACKGROUNDS Since the number of drug advertisements is increasing due to the expansion of advertising markets and the emergence of a new type of advertisement, it is important to review drug advertisements accurately and efficiently. OBJECTIVE We aim to gather and analyze the expert’s opinions regarding the criteria and procedures of drug advertisement review. METHODS Survey questionnaire was sent to 42 members of the drug advertisement review committee. The questionnaire included the key principle of drug advertisement review, the importance of prohibition by type of advertisement, the necessity of permitting by type of advertisement, and questions about current procedures of drug advertisement review. RESULTS In total, 23 of 42 members participated (54.7% response rate). Survey results showed that the ‘Proper expression of efficacy and effectiveness’ and ‘Fair competition among drugs’ were important principles. Prohibition of ‘False advertisements’ and ‘Advertisements that distort facts’ were considered important. The degree of agreement in the need for permission was relatively low, but it was considered relatively necessary to allow ‘Advertisements that present drugs which have been recognized for safe use, such as vitamins.’ All respondents agreed that the number of drug advertisement reviews was high. Approximately 70% of respondents answered that current review fees are not adequate. CONCLUSION This study shows the degree of consensus of experts and provides evidence for further amendment on criteria and procedures of drug advertisement review.
Cho, Beom-Gon,Lee, Seonghwan,Hwang, Sang-Ha,Han, Jong Hun,Chae, Han Gi,Park, Young-Bin Elsevier 2018 Carbon Vol.140 No.-
<P><B>Abstract</B></P> <P>Nylon 6,6 nanocomposites containing well-dispersed graphene oxide (GO) and carbon nanotubes (CNTs) were successfully fabricated via <I>in situ</I> interfacial polymerization between two immiscible phases: organic phase assisted by poly(vinylpyrrolidone, PVP) surfactant containing adipoyl chloride with dispersion of GO and CNTs; aqueous phase containing hexamethylenediamine. Prior to polymerization, GO was functionalized with thionyl chloride, resulting in acyl-chloride-functionalized GO (AGO). The effect of incorporation of AGO and PVP on the state of dispersion was investigated. It was observed that the addition of AGO and PVP reduced particle flocculation, leading to a well-dispersed suspension as verified using dispersion stability measurement and UV–Vis spectroscopy. The interfacial interaction between the carbon nano-fillers and nylon 6,6 chain can be induced via hydrogen and covalent bonding between them. Thermal analyses revealed nuclei crystallization in nylon 6,6 nanocomposites was promoted by the strong nucleating behavior of AGO, and the thermal stability was improved. Tensile tests of the composite films (nylon 6,6/AGO, CNT) showed increases of 122 and 152%, respectively, in the tensile strength and modulus as compared to the neat polymer. This suggests that the interfacial interaction between nylon 6,6 and AGO/CNT contributes to enhanced load transfer in nanocomposites, thus enhancing the mechanical properties of the nanocomposites.</P> <P><B>Graphical abstract</B></P> <P>(a) Schematic of <I>in-situ</I> interfacial polymerization process of nylon 6,6 including AGO, CNT with PVP showing (b) chemical reaction of nylon 6,6 synthesis and its occurrence at the interface between two immiscible phases is demonstrated in inset photograph of (a).</P> <P>[DISPLAY OMISSION]</P>
COMPONENT-BASED DEVELOPMENT OF OBSERVATIONAL SOFTWARE FOR KASI SOLAR IMAGING SPECTROGRAPH
SEONGHWAN CHOI,김연한,YONG-JAE MOON,KYUNG-SEOK CHO,YOUNG-DEUK PARK,BI-HO JANG,김수진,KAP-SUNG KIM 한국천문학회 2005 Journal of The Korean Astronomical Society Vol.38 No.4
In this paper, we have made the component-based development of observational software for KASIsolar imaging spectrograph (KSIS) that is able to obtain three-dimensional imaging spectrograms byusing a scanning mirror in front of the spectrograph slit. Since 2002, the KASI solar spectrographhas been successfully operated to observe solar spectra for a given slit region as well as to inspect theresponse functions of narrow band lters. To improve its capability, we have developed the KSIS thatcan perform sequential observations of solar spectra by simultaneously controlling the scanning mirrorand the CCD camera via Visual C++. Main task of this paper is to introduce the development ofthe component-based software for KSIS. Each component of the software is reusable on the level ofexecutable le instead of source code because the software was developed by using CBD (component-based development) methodology. The main advantage of such a component-based software is that keycomponents such as image processing component and display component can be applied to other similarobservational software without any modications. Using this software, we have successfully obtainedsolar imaging spectra of an active region (AR 10708) including a small sunspot. Finally, we presentsolar H spectra (6562.81A) that were obtained at an active region and a quiet region in order toconrm the validity of the developed KSIS and its software.
Park, Seonghwan,Kim, Jeongmi,Park, Younghyun,Son, Suyoung,Cho, Sunja,Kim, Changwon,Lee, Taeho Elsevier 2017 Bioresource technology Vol.234 No.-
<P><B>Abstract</B></P> <P>Two competitive strategies, fed-batch and sequencing-batch cultivation, were compared in cost-effective biomass production of a high lipid microalgae, <I>Micractinium inermum</I> NLP-F014 using a blended wastewater medium. For fed-batch cultivations, additional nutrient was supplemented at day 2 (FB1) or consecutively added at day 2 and 4 (FB2). Through inoculum size test, 1.0g-DCWL<SUP>−1</SUP> was selected for the sequencing-batch cultivation (SB) where about 65% of culture was replaced with fresh medium every 2days. Both fed-batch cultivations showed the maximum biomass productivity of 0.95g-DCWL<SUP>−1</SUP> d<SUP>−1</SUP>, while average biomass productivity in SB was slightly higher as 0.96±0.08g-DCWL<SUP>−1</SUP> d<SUP>−1</SUP>. Furthermore, remained concentrations of organics (426mg-CODL<SUP>−1</SUP>), total nitrogen (15.4mg-NL<SUP>−1</SUP>) and phosphorus (0.6mg-PL<SUP>−1</SUP>) in SB were much lower than those of fed-batch conditions. The results suggested that SB could be a promising strategy to cultivate <I>M. inermum</I> NLP-F014 with the blended wastewater medium.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A valuable strategy for cost-effective production of <I>M. inermum</I> was determined. </LI> <LI> Two batch cultivation strategies, fed-batch and sequencing-batch mode, were tested. </LI> <LI> Culture medium was a mixture of domestic WW and aerobically digested swine WW. </LI> <LI> The highest biomass productivity was obtained from the sequencing-batch mode. </LI> <LI> The sequencing-batch mode also showed low environmental impacts. </LI> </UL> </P>
TOWARD NEXT GENERATION SOLAR CORONAGRAPH: DEVELOPMENT OF COMPACT DIAGNOSTIC CORONAGRAPH ON ISS
Kyungsuk Cho,Suchan Bong,Seonghwan Choi,Heesu Yang,Jihun Kim,Jihye Baek,Jongyeob Park,Eun-Kyung Lim,Rok-Soon Kim,Sujin Kim,Yeon-Han, Kim,Young-Deuk Park,S.W. Clarke,J.M. Davila,N. Gopalswamy,V. M. Nak 한국천문학회 2017 天文學會報 Vol.42 No.2
Dongmin Park,SeongHwan Cho IEEE 2012 IEEE journal of solid-state circuits Vol.47 No.12
<P>In this paper, a low-noise cascaded PLL is proposed where an integer-N digital bang-bang PLL is used to multiply a 50 MHz reference to an 800 MHz clock that is fed to a ΔΣ fractional-N PLL to generate 2.55-to-3 GHz output. In order to minimize the jitter of the 800 MHz clock, a reference injection scheme using dual-pulse ring oscillator is employed. Quantization noise from the delta-sigma modulator is suppressed without any noise cancellation techniques owing to the high operating frequency of the fractional-N PLL. Prototype implemented in 0.13 μm CMOS process achieves the worst-case RMS jitter of 356 fs<I>rms</I> over 100 Hz to 40 MHz integration bandwidth, while consuming 14.2 mW from a 1.2 V supply. The worst-case fractional spur measured over 7 different chips is -53.9 dBc and the reference spur is -84 dBc.</P>