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Bogyu Kim,Younguk Jeon,Hyebi Kim,Chulwoo Lee,JoonHyun Kang,Jongbum Kim,In Soo Kim,Young-Hwan Kim,Kwanil Lee,Young Duck Kim,Il Ki Han 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Potassium tantalate niobate (KTal-xNbxO3, KTN) is a ferroelectric material with an extremely high electro-optic (EO) coefficient suitable for integrated photonic device. In the K-Ta-Nb-O system, the perovskite structure KTN with the ferroelectric properties is generally hard to deposit due to high volatility of potassium(K). By controlling K contents in a KTN ceramic target, the crystal structure can be formed from pyrochlore to perovskite phase. In this presentation, we will analyze the effects of K-enriched targets on the phase-formation process in KTN films and its structural differences.
Improved determination ofBKwith staggered quarks
Bae, Taegil,Jang, Yong-Chull,Jeong, Hwancheol,Jung, Chulwoo,Kim, Hyung-Jin,Kim, Jangho,Kim, Jongjeong,Kim, Kwangwoo,Kim, Sunghee,Lee, Weonjong,Leem, Jaehoon,Pak, Jeonghwan,Park, Sungwoo,Sharpe, Stephe American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.7
Expression patterns of bisphenol A - exposed medaka fish(O. latipes) analyzed with a cDNA microarray
Chulwoo Lee,Eun-Hye Jo,Jisung-Ryu,Eung-Roh Park,Kyung-Tae Kim,Eun-Kyoung Kim,Hyun-Mi Kim,Kyunghee Choi 한국보건교육건강증진학회 2007 한국보건교육·건강증진학회 학술대회 발표논문집 Vol.- No.-
Changes in gene expression in the liver of medaka fish (Oryzias latipes) in response to bisphenol A were investigated with a microarray consisting of medaka-specific cDNA probes. Upon exposure to bisphenol A at three different concentrations (0.02, 0.2 and 2㎎/L) for 6 days, we found the different genes that were up- or down-regulated with statistically significant changes. Vitellogenin and choriogenin subtype genes were up-regulated, but annexin and some regulation factors were down-regulated. Our results suggest that this medaka chip microarray would be useful to generate gene expression profiles for toxicogenomics studies using fish.
Kim, Jeum-Jong,Choi, Hyunbong,Paek, Sanghyun,Kim, Chulwoo,Lim, Kimin,Ju, Myung-Jong,Kang, Hong Seok,Kang, Moon-Sung,Ko, Jaejung American Chemical Society 2011 Inorganic chemistry Vol.50 No.22
<P>A new class of cyclometalated ruthenium sensitizers incorporating a ĈN̂N ligand and conjugated 2,2′-bipyridine in the ancillary ligand have been designed and synthesized. The photovoltaic performance of <B>JK-206</B> using an electrolyte containing 0.6 M 1,2-dimethyl-3-propylimidazolium iodide, 0.05 M I<SUB>2</SUB>, 0.1 M LiI, and 0.5 M <I>tert</I>-butylpyridine in CH<SUB>3</SUB>CN gave a short-circuit photocurrent density of 19.63 mA cm<SUP>–2</SUP>, an open-circuit voltage of 0.74 V, and a fill factor of 0.72, affording an overall conversion efficiency of 10.39%. The efficiency is the highest one reported for dye-sensitized solar cells based on the cyclometalated ruthenium sensitizer of the type ĈN̂N. Moreover, the same device using a polymer gel electrolyte exhibited a remarkable stability under 1000 h of light soaking at 60 °C, retaining 91% of the initial efficiency of 7.14%.</P><P>A new class of cyclometalated ruthenium sensitizers incorporating a ĈN̂N ligand and conjugated 2,2′-bipyridine in the ancillary ligand have been designed and synthesized. The high efficiency and excellent stability may be attributed to the intrinsic stability of the cyclometalated ruthenium complex with a ĈN̂N ligand and the broad and red-shifted absorption property of the cyclometalated complex.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2011/inocaj.2011.50.issue-22/ic200872a/production/images/medium/ic-2011-00872a_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic200872a'>ACS Electronic Supporting Info</A></P>
Nanoparticle and virus-like particle vaccine approaches against SARS-CoV-2
Kim Chulwoo,Kim Jae-Deog,Seo Sang-Uk 한국미생물학회 2022 The journal of microbiology Vol.60 No.3
The global spread of coronavirus disease 2019 caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection has provoked an urgent need for prophylactic measures. Several innovative vaccine platforms have been introduced and billions of vaccine doses have been administered worldwide. To enable the creation of safer and more effective vaccines, additional platforms are under development. These include the use of nanoparticle (NP) and virus-like particle (VLP) technology. NP vaccines utilize self-assembling scaffold structures designed to load the entire spike protein or receptor-binding domain of SARS-CoV-2 in a trimeric configuration. In contrast, VLP vaccines are genetically modified recombinant viruses that are considered safe, as they are generally replication-defective. Furthermore, VLPs have indigenous immunogenic potential due to their microbial origin. Importantly, NP and VLP vaccines have shown stronger immunogenicity with greater protection by mimicking the physicochemical characteristics of SARS-CoV-2. The study of NPand VLP-based coronavirus vaccines will help ensure the development of rapid-response technology against SARS-CoV-2 variants and future coronavirus pandemics.
A 250-Mb/s to 6-Gb/s Referenceless Clock and Data Recovery Circuit With Clock Frequency Multiplier
Kim, Ja-Young,Song, Junyoung,You, Jungtaek,Hwang, Sewook,Bae, Sang-Geun,Kim, Chulwoo IEEE 2017 IEEE transactions on circuits and systems. a publi Vol.64 No.6
<P>This brief describes the design and implementation of a 250-Mb/s to 6-Gb/s single-loop referenceless clock and data recovery circuit. The clock frequency multiplier and the referenceless frequency acquisition circuit are used to cover a wide-range data rate. The clock frequency multiplier is proposed to generate the 6-GHz clock with low jitter. In addition, the voltage-controlled oscillator operates at 1/5-rate frequency of the sampling clock, which has a merit of low power consumption. The proposed circuit achieves 9.56-ps rms jitter, consumes 13.2 mW at 6 Gb/s, and occupies 0.0944 mm(2) in a 65-nm CMOS technology.</P>
Fully Autonomous Vision-Based Net-Recovery Landing System for a Fixed-Wing UAV
Kim, H. Jin,Mingu Kim,Hyon Lim,Chulwoo Park,Seungho Yoon,Daewon Lee,Hyunjin Choi,Gyeongtaek Oh,Jongho Park,Youdan Kim IEEE 2013 IEEE/ASME transactions on mechatronics Vol.18 No.4
<P>This paper presents an autonomous vision-based netrecovery system for small fixed-wing unmanned aerial vehicles (UAVs). A fixed-wing UAV platform is constructed using various avionic sensors, and integrated with a flight control system and a vision system. The ground operation system consists of a vision station and ground control station that provide operation commands and monitor the UAV status. The vision algorithm to detect the recovery net and provide the bearing angle to the guidance algorithm is explained, along with the discussions on the techniques employed to improve the reliability of visual detection. The system identification process and controller are described, which enables to track given waypoints and to approach the detected net under the pursuit guidance law. Experimental results show the autonomous capabilities including take-off, waypoint following, and vision-based net recovery. The proposed technique can be an effective solution to recover fixed-wing UAVs without resorting to a complicated structure such as an instrumented landing system or expensive sensors such as a differential GPS.</P>