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Performance of 3D printed plastic scintillators for gamma-ray detection
Kim, Dong-geon,Lee, Sangmin,Park, Junesic,Son, Jaebum,Kim, Tae Hoon,Kim, Yong Hyun,Pak, Kihong,Kim, Yong Kyun Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.12
Digital light processing three-dimensional (3D) printing technique is a powerful tool to rapidly manufacture plastic scintillators of almost any shape or geometric features. In our previous study, the main properties of light output and transmission were analyzed. However, a more detailed study of the other properties is required to develop 3D printed plastic scintillators with expectable and reproducible properties. The 3D printed plastic scintillator displayed an average decay time constants of 15.6 ns, intrinsic energy resolution of 13.2%, and intrinsic detection efficiency of 6.81% for 477 keV Compton electrons from the <sup>137</sup>Cs γ-ray source. The 3D printed plastic scintillator showed a similar decay time and intrinsic detection efficiency as that of a commercial plastic scintillator BC408. Furthermore, the presented estimates for the properties showed good agreement with the analyzed data.
Kim, Jiyeon,Kern, Elizabeth,Kim, Taeho,Sim, Mikang,Kim, Jaebum,Kim, Yuseob,Park, Chungoo,Nadler, Steven A.,Park, Joong-Ki Elsevier 2017 Molecular phylogenetics and evolution Vol.107 No.-
<P><B>Abstract</B></P> <P>Plectida is an important nematode order with species that occupy many different biological niches. The order includes free-living aquatic and soil-dwelling species, but its phylogenetic position has remained uncertain. We sequenced the complete mitochondrial genomes of two members of this order, <I>Plectus acuminatus</I> and <I>Plectus aquatilis</I> and compared them with those of other major nematode clades. The genome size and base composition of these species are similar to other nematodes; 14,831 and 14,372bp, respectively, with AT contents of 71.0% and 70.1%. Gene content was also similar to other nematodes, but gene order and coding direction of <I>Plectus</I> mtDNAs were dissimilar from other chromadorean species. <I>P. acuminatus</I> and <I>P. aquatilis</I> are the first chromadorean species found to contain a gene inversion. We reconstructed mitochondrial genome phylogenetic trees using nucleotide and amino acid datasets from 87 nematodes that represent major nematode clades, including the <I>Plectus</I> sequences. Trees from phylogenetic analyses using maximum likelihood and Bayesian methods depicted Plectida as the sister group to other sequenced chromadorean nematodes. This finding is consistent with several phylogenetic results based on SSU rDNA, but disagrees with a classification based on morphology. Mitogenomes representing other basal chromadorean groups (Araeolaimida, Monhysterida, Desmodorida, Chromadorida) are needed to confirm their phylogenetic relationships.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The phylogenetic position of Plectida within Chromadorea (Nematoda) remains uncertain. </LI> <LI> We determined two new mitochondrial genome sequences of <I>Plectus</I>, the first representatives of the order Plectida. </LI> <LI> Mitochondrial genome trees depicted Plectida as the sister group to all other chromadorean nematodes (Rhabditida). </LI> <LI> The mitochondrial gene arrangement of <I>Plectus</I> is unique, and has no shared gene clusters with other chromadorean members. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hyunhee Kim(Hyunhee Kim),Jaebum Lee(Jaebum Lee),Heejung We(Heejung We) J-INSTITUTE 2022 International Journal of Human & Disaster Vol.7 No.2
Purpose: This study was analyzed with a qualitative research method by applying a phenomenological method to examine the experiences and perceptions and attitudes about health care of workers participating in rehabil-itation exercises after suffering an industrial accident while working in the K automobile manufacturing industry in Korea. Method: As for the selection of research participants, a total of 12 participants were selected as the final research participants, including 1 female and 11 male, who could provide a wealth of information on the subject of the study. For data collection and analysis, Colaizzi's six-step analysis method was used to identify the partic-ipants' experiences and cognitive changes who participated in the rehabilitation program. Also, the participants' facial expressions and actions were recorded so that they could be used as additional observational data and reflected in the results of further research. Results: As a result of the study, 5 categories, 13 topic collections, 32 topics, and 97 construct meanings were finally confirmed. Specifically, the importance of strengthening the intrinsic motivation of the participants was emphasized in order to continuously practice health promotion after an industrial accident in the automobile manufacturing industry. In addition, it appears that a method of self-awareness of the necessity of exercise, giving fun of the complex program, and preventing and managing it in daily life is needed. Conclusion: The contents derived from the results of this study represent the changing perception of workers toward continuous health promotion management and improvement after an industrial accident. Through the research results, it was an opportunity to confirm the changing perception of health care among workers, and it is expected to be actively used in the future by developing rehabilitation exercise programs at the workplace in the automobile industry.
LVRT/HVRT System 모델 개발 전략에 관한 연구
김병기(Byungki Kim),유경상(Kyungsang Ryu),남양현(Yanghyun Nam),김찬수(Chansoo Kim),고희상(Heesang ko),김미성(Misung Kim),박재범(Jaebum Park),김대진(Daejin Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7
본 논문에서는 대용량 풍력발전기를 대상으로 일정기준이상 연계운전 능력을 평가할 수 있는 10MW급 이상의 LVRT(Low voltage Ride Through)/HVRT(Low voltage Ride Through)기능 모의가 가능한 시험장비의 개발 방안을 제안한다. 즉 RLC 방식의 단점을 보완한 단권변압기를 기반 탭 변환 방식시험장치의 권선비 조정 모델을 제안한다.. 상기에서 제안한 설계 및 운영 방안을 바탕으로 구현한축소형 LVRT/HVRT 시험장비의 성능시험을 통해 본 논문에서 제시한 설비의 유용성을 확인하였다.
Kim, Keon Hee,Yoon, Youngdae,Hong, Woon-Young,Kim, JaeBum,Cho, Yung-Chul,Hwang, Soon-Jin The Korean Society for Applied Biological Chemistr 2018 Applied Biological Chemistry (Appl Biol Chem) Vol.61 No.2
A wide variety of cyanobacterial species that inhabit freshwater systems are known to produce diverse toxins and off-flavor compounds during the development of environmentally harmful blooms. However, cyanobacterial community development and toxin production potential have not been well studied. In this study, we examined the taxonomic diversity and saxitoxin production potential of cyanobacteria in the water and sediments of a large river, the North Han River in South Korea, by metagenome analysis using next-generation sequencing (NGS) and molecular biological approaches, respectively. NGS revealed that the entire cyanobacterial community in the study area consisted of 39 genera and 47 species. The most abundant genera were Microcystis, Anabaena, Cyanobium, and Synechococcus, which accounted for more than 90% of the entire community. The saxitoxin production potential of the cyanobacterial community was assessed by detecting the sxtA and sxtG genes related to saxitoxin production. Eleven sxtA and 24 sxtG genes were identified through molecular cloning and sequencing. Phylogenic analysis revealed that three sxtA genes that grouped in one phylogenic branch with Scytonema sp. were distinctly separated from the sxtA genes of Anabaena, Aphanizomenon, Lyngbya, and Cylindrospermopsis. Sixteen of the detected sxtG genes were phylogenically similar to those of Anabaena circinalis (Dolichospermum circinale), Aphanizomenon gracile, and Aphanizomenon flos-aquae. Our study demonstrates the utility of the metagenomics approach for characterizing the natural community structure of cyanobacteria containing diverse and even rare species, and the evaluation of saxitoxin-producing potential in the cyanobacterial community.
Large-Scale Plasma Patterning of Transparent Graphene Electrode on Flexible Substrates
Kim, Ji Hye,Ko, Euna,Hwang, Joonki,Pham, Xuan-Hung,Lee, Joo Heon,Lee, Sung Hwan,Tran, Van-Khue,Kim, Jong-Ho,Park, Jin-Goo,Choo, Jaebum,Han, Kwi Nam,Seong, Gi Hun American Chemical Society 2015 Langmuir Vol.31 No.9
<P>Graphene, a two-dimensional carbon material, has attracted significant interest for applications in flexible electronics as an alternative transparent electrode to indium tin oxide. However, it still remains a challenge to develop a simple, reproducible, and controllable fabrication technique for producing homogeneous large-scale graphene films and creating uniform patterns with desired shapes at defined positions. Here, we present a simple route to scalable fabrication of flexible transparent graphene electrodes using an oxygen plasma etching technique in a capacitively coupled plasma (CCP) system. Ascorbic acid-assisted chemical reduction enables the large-scale production of graphene with solution-based processability. Oxygen plasma in the CCP system facilitates the reproducible patterning of graphene electrodes, which allows controllable feature sizes and shapes on flexible plastic substrates. The resulting graphene electrode exhibits a high conductivity of 80 S cm<SUP>–1</SUP> and a transparency of 76% and retains excellent flexibility upon hard bending at an angle of ±175° and after repeated bending cycles. A simple LED circuit integrated on the patterned graphene film demonstrates the feasibility of graphene electrodes for use in flexible transparent electrodes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2015/langd5.2015.31.issue-9/la504443a/production/images/medium/la-2014-04443a_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la504443a'>ACS Electronic Supporting Info</A></P>
Kim, Hye-In,Hwang, Dobeen,Jeon, Su-Ji,Lee, Sangyeop,Park, Jung Hyun,Yim, DaBin,Yang, Jin-Kyoung,Kang, Homan,Choo, Jaebum,Lee, Yoon-Sik,Chung, Junho,Kim, Jong-Ho The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.14
<P>Nanomaterial bioconjugates have gained unabated interest in the field of sensing, imaging and therapy. As a conjugation process significantly affects the biological functions of proteins, it is crucial to attach them to nanomaterials with control over their orientation and the nanomaterial-to-protein ratio in order to amplify the binding efficiency of nanomaterial bioconjugates to targets. Here, we describe a targeting nanomaterial platform utilizing carbon nanotubes functionalized with a cotinine-modified dextran polymer and a bispecific anti-HER2 cotinine tandem antibody. This new approach provides an effective control over antibody orientation and density on the surface of carbon nanotubes through site-specific binding between the anti-cotinine domain of the bispecific tandem antibody and the cotinine group of the functionalized carbon nanotubes. The developed synthetic carbon nanotube/bispecific tandem antibody conjugates (denoted as SNAs) show an effective binding affinity against HER2 that is three orders of magnitude higher than that of the carbon nanotubes bearing a randomly conjugated tandem antibody prepared by carbodiimide chemistry. As the density of a tandem antibody on SNAs increases, their effective binding affinity to HER2 increases as well. SNAs exhibit strong resonance Raman signals for signal transduction, and are successfully applied to the selective detection of HER2-overexpressing cancer cells.</P>
Clinical research on the ophthalmic factors affecting 3D asthenopia.
Kim, Seung-Hyun,Suh, Young-Woo,Song, Jong-Suk,Park, Ji-Hye,Kim, Yong Yeon,Huh, Kuhl,Son, Jaebum,Kham, Keetaek,Jeong, Taeuk,Pyo, Kyung Soo C. B. Slack] 2012 Journal of pediatric ophthalmology and strabismus Vol.49 No.4
<P>Watching three-dimensional (3D) images is known to induce ocular and non-ocular symptoms, such as eye discomfort, fatigue, headache, and nausea, which can be referred to as '3D asthenopia'. This study investigated ophthalmic factors associated with 3D asthenopia.</P>
PSAR-Align: improving multiple sequence alignment using probabilistic sampling
Kim, Jaebum,Ma, Jian Oxford University Press 2014 Bioinformatics Vol.30 No.7
<P><B>Summary:</B> We developed PSAR-Align, a multiple sequence realignment tool that can refine a given multiple sequence alignment based on suboptimal alignments generated by probabilistic sampling. Our evaluation demonstrated that PSAR-Align is able to improve the results from various multiple sequence alignment tools.</P><P><B>Availability and implementation:</B> The PSAR-Align source code (implemented mainly in C++) is freely available for download at http://bioen-compbio.bioen.illinois.edu/PSAR-Align.</P><P><B>Contact:</B> jbkim@konkuk.ac.kr or jianma@illinois.edu</P>