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Zoological Research 2021年第1期42卷 124-129页

作者： Seung Jae Lee Jeong-Hoon Kim Euna Jo Eunkyung choi Jinmu Kim seok-gwan choi Sangdeok Chung Hyun-Woo Kim Hyun Park College of Life Sciences and Biotechnology Korea UniversitySeoul 02841Republic of Korea Division of Polar Life Science Korea Polar Research InstituteIncheon 21990Republic of Korea Unit of Research for Practical Application Korea Polar Research InstituteIncheon 21990Republic of Korea National Institute of Fisheries Science(NIFS) Busan 46083Republic of Korea Department of Marine Biology Pukyong National UniversityBusan 48513Republic of Korea

DEAR EDITOR,The Antarctic toothfish,Dissostichus mawsoni,belongs to the Nototheniidae family and is distributed in sub-zero temperatures below S60°latitude in the Southern ***,it is an attractive model species to study the stenothermal cold-adapted character *** this study,we successfully generated highly contiguous genome sequences of ***,which contained 1062 scaffolds with a N50 length of 36.98 Mb and longest scaffold length of 46.82 *** elements accounted for 40.87%of the *** also inferred 32914 protein-coding genes using in silico gene prediction and transcriptome sequencing and detected splicing variants using Isoform-Sequencing(Iso-Seq),which will be invaluable resource for further exploration of the adaptation mechanisms of Antarctic *** new high-quality reference genome of *** provides a fundamental resource for a deeper understanding of cold adaptation and conservation of species.

关键词： Antarctic latitude fish

Laser-assisted deposition of Cu bumps for microelectronic packaging

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中国有色金属学会会刊：英文版 2012年第S3期22卷 683-687页

作者： Won-seok choi Joohan KIM Department of Nano IT Fusion Program Seoul National University of Science and Technology Department of Mechanical and Automotive Engineering Seoul National University of Science and Technology

Cu bump was transferred using a focused laser pulse for microelectronic *** Nd:YAG laser pulse (maximum energy of 500 mJ;wavelength of 1064 nm;fluences of 0.4-2.1 kJ/cm2) was irradiated on a sacrificial absorption layer with copper *** focused laser beam induced plasma between the semi-transparent donor slide and the sacrificial layer,causing a shock *** shock wave pressure pushed the Cu layer and transferred material to deposit a bump on substrate.A beam-shaper was used to produce uniform pressure at the interface to reduce fragmentation of the transferred material on the *** calculated shock wave pressure with respect to laser fluence was 1-3 GPa.A Cu bump of diameter of 200 μm was successfully deposited at laser fluence of 0.6 kJ/cm *** pressure control at the sacrificial layer using a laser pulse was critical to produce a bump with less *** technique can be applied to forming Cu bump for an interconnecting process in electronics.

关键词： laser induced forward transfer bump deposition Nd:YAG pulsed laser micro system packaging beam shaping

Visualization of flow structures inside a conical spouted bed by electrical capacitance volume tomography

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Particuology 2019年第1期17卷 15-25页

作者： Hoon Chae Park Hang seok choi Department of Environmental Engineering Yonsei UniversityWonju 26493Republic of Korea

Electrical capacitance volume tomography (ECVT) was conducted to measure instantaneous gas–solid flow structures in a conical spouted bed. The sensor has 24 electrodes/channels and was used to make three-dimensional measurements of the solid volume fraction. Flow structures in the conical spouted bed were analyzed using quantitative ECVT images. Three-dimensional images of gas–solid flow structures and time-averaged vertical and radial solid volume fraction profiles are presented. Different fluidization regimes in spouted beds were characterized by analyzing pressure fluctuation signals and ECVT images. ECVT was shown to be robust and powerful for the three-dimensional visualization and quantitative measurement of a gas–solid fluidization system.

关键词： Conical spouted bed Electrical capacitance volume tomography Multiphase flow

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Journal of Materials Science & Technology 2022年第16期111卷 99-110页

作者： Vioni Dwi Sartika Won seok choi gwanghyo choi Jaewook Han Sung-Jin Chang Won-seok Ko Blazej Grabowski Pyuck-Pa choi Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Gangwon Regional Division Korea Institute of Industrial TechnologyGangwon 25440Republic of Korea Division of Measurement and Analysis National Nanofab CenterDaejeon 34141Republic of Korea School of Materials Science and Engineering University of UlsanUlsan 44610Republic of Korea Institute for Materials Science University of StuttgartPfaffenwaldring 5570569 StuttgartGermany

We report laser cladding of pure titanium on a CoCrMo alloy using directed energy *** electron microscopy,the microstructural evolution upon varying the process parameters,especially laser power and powder feed rate,was investigated in relation to crack *** layers showing dilution rates of more than 5%contained cracks due to the formation of the brittle Co_(2)Ti intermetallic *** observed cracks could be ascribed to a mismatch in thermal expansion and a resulting stress of more than 440 MPa acting on the Co_(2)Ti phase,as determined by density functional theory and ***,an excess laser energy caused chemical inhomogeneity and unmelted Ti powder particles,while a deficient laser energy resulted in a lack of *** cracks nor partially melted powders were observed for a powder feed rate of 3 g/min and a laser power of 225–300 W,for which the dilution rate was minimized to less than 5%.For such samples,the cladding layers comprised pureα-Ti and a uniform CoT i interface with Co_(2)Ti islands.

关键词： Additive manufacturing Dissimilar metal joining Titanium Cobalt-based alloy

Role of kaempferol to increase bioavailability and pharmacokinetics of nifedipine in rats

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Chinese Journal of Natural Medicines 2019年第9期17卷 690-697页

作者： PARK Ji-Won choi Jin-seok Hazardous Substances Analysis Division Gwangju Regional Office of Food and Drug SafetyGwangju 61012Republic of Korea Department of Medical Management Chodang UniversityJeollanam-do 58530Republic of Korea

Herein,the purpose of this study is to evaluate the effects of kaempferol on bioavailability and pharmacokinetics of nifedipine and its metabolite dehydronifedipine in *** experimental design is based on with or without kaempferol in the oral and intravenous administration of nifedipine in ***,the pharmacokinetic parameters including nifedipine and dehydronifedipine were evaluated in *** in vitro studies of kaempferol were investigated on P-glycoprotein(P-gp)and cytochrome P450(CYP)3A4 *** reduced a 50%inhibitory concentration(IC50)of 8.6μmol·L-1 on CYP3A4 enzyme ***,kaempferol clearly improved the cell internalization of rhodamine-123 in MCF-7/ADR cells overexpressing *** on increased concentrations of kaempferol,the areas under the plasma concentration–time curve(AUC0-∞)and the peak concentration(Cmax)of nifedipine were increased after oral and intravenous ***,the absolute bioavailability(AB)and relative bioavailability(RB)of nifedipine in the presence of kaempferol was significantly higher than those of the control group after oral and intravenous *** of bioavailability of nifedipine by kaempferol may be mainly because of the inhibition of the P-gp-mediated efflux transporter in the small intestine and CYP3A4-mediated metabolism in the small intestine or liver,or both.

关键词： Nifedipine Kaempferol CYP3A4 P-gp Pharmacokinetics Bioavailability

Interplay between Plants and Microbial Communities:Insights from Holobionts and Environmental Interactions

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Phyton-International Journal of Experimental Botany 2024年第10期93卷 2519-2534页

作者： Sejin choi Ho-seok Lee Department of Biology College of SciencesKyung Hee UniversitySeoul02447Republic of Korea Center for Genome Engineering Institute for Basic ScienceDaejeon34126Republic of Korea

Plants interact with a complex network of microorganisms,forming a dynamic holobiont that is crucial for their health,growth,and *** interconnected system is deeply influenced by environmental factors,which modulate the relationships within the plant *** environmental drivers such as light,temperature,and moisture can alter the balance of these interactions,impacting plant immunity,resilience,and overall *** traditional disease triangle model,which emphasizes plant-pathogen-environment interactions,is enhanced by incorporating the role of the microbiome,revealing how microbial communities contribute to disease *** review highlights the importance of shifting focus from studying plants in isolation to embracing an integrated approach that accounts for the intricate interactions between plants,microbes,and their surrounding *** these interactions is pivotal as we explore new approaches,including advanced sequencing technologies and microbiome engineering,to optimize plant-microbe relationships for improved crop *** insights are vital for developing sustainable agricultural practices to address the impacts of climate change and other environmental challenges.

关键词： Holobiont disease triangle plant-associated microbiome temperature moisture circadian clock

Flow-based queue management for fairness control in high-bandwidth network

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Science China(Information Sciences) 2016年第6期59卷 261-263页

作者： Wonjun choi Ramneek SEKHON Woojin seok Department of Science and Technology Information Science Korea University of Science & Technology Department of Advanced KREONET Application Support Korea Institute of Science and Technology Information

Dear editor,With the development of information equipment and growth of broadband network,the progress of Internet has changed from the network with modem speed in the past to the *** essential problem in the use of the network in a variety of fields is to use the network resource efficiently distributing the limited bandwidth[1].If congestion occurs in high-bandwidth network,slow rate flow and fast rate flow will experience

关键词： Flow-based queue management for fairness control in high-bandwidth network high

Omnidirectional color wavelength tuning of stretchable chiral liquid crystal elastomers

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Light(Science & Applications) 2024年第6期13卷 1062-1074页

作者： Seungmin Nam Wontae Jung Jun Hyuk Shin Su seok choi Department of Electrical Engineering Pohang University of Science and Technology(POSTECH)PohangKorea

Wavelength-tunable structural colors using stimuli-responsive materials,such as chiral liquid crystals(CLCs),have attracted increasing attention owing to their high functionality in various tunable photonic ***,on-demand omnidirectional wavelength control is highly desirable from the perspective of wavelength-tuning ***,despite numerous previous research efforts on tunable CLC structural colors,only mono-directional wavelength tuning toward shorter wavelengths has been employed in most studies to *** this study,we report the ideally desired omnidirectional wavelength control toward longer and shorter wavelengths with significantly improved tunability over a broadband wavelength *** using areal expanding and contractive strain control of dielectric elastomer actuators(DEAs)with chiral liquid crystal elastomers(CLCEs),simultaneous and omnidirectional structural color-tuning control was *** breakthrough in omnidirectional wavelength control enhances the achievable tuning freedom and versatility,making it applicable to a broad range of high-functional photonic applications.

关键词： tuning tunable directional

Decomposition behavior of yttria-stabilized zirconia and its effect on directed energy deposited Ti-based composite material

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Journal of Materials Science & Technology 2022年第17期112卷 138-150页

作者： gwanghyo choi Won seok choi Yoon Sun Lee Dahye Kim Ji Hyun Sung Seungjun An Chang-seok Oh Amine Hattal Madjid Djemai Brigitte Bacroix Guy Dirras Pyuck-Pa choi Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea 3D Additive Manufacturing Application Tech.Center Korea Institute of Industrial TechnologyDaegu 42994Republic of Korea InssTek Co. Daejeon 04763Republic of Korea Korea Institute of Materials Science 797 ChangwondaeroChangwon 51508Republic of Korea UniversitéSorbonne Paris Nord Laboratoire des Sciences des Procédés et des MatériauxLSPMCNRSUPR 3407F-93430VilletaneuseFrance Z3Dlab Parc Technologique26 Rue des SablonsMontmagny 95360France CNRS UPR3407Laboratoire des Sciences des Procédés et des MatériauxLSPMUniversitéSorbonne Paris NordF-93430VilletaneuseFrance

We report on the microstructure and the strengthening mechanisms of additively manufactured parts fabricated by directed energy deposition of Ti-6Al-4V(Ti64)powders blended with yttria-stabilized zirconia(YSZ)*** specimens showed refined microstructures as compared to bare as-deposited Ti64,where theαand columnar priorβgrain sizes decreased with increasing YSZ *** YSZ nanoparticles decomposed during the deposition process and led to the formation of yttrium oxide and some excess oxygen in the Ti64 *** decrease in the sizes of the priorβgrains could be attributed to the increasing amount of dissolved oxygen and yttrium,which promoted constitutional ***,the reduction in the size of theαgrains could be ascribed to a shift of the onset of theβ→α+βtransformation to a higher temperature and shorter time with increasing concentration of dissolved ***,the contributions of the underlying strengthening mechanisms for the as-deposited specimens were quantitatively determined.

关键词： Additive manufacturing Directed energy deposition Metal matrix composites Titanium alloys Yttrium-stabilized zirconia

Evaluation of vibration and sound quality according to battery voltage change while moving a power seat in an automobile forward or backward

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Journal of Central South University 2014年第10期21卷 3844-3849页

作者： Kang-seok Seo Doo-seuk choi Key-sun Kim Department of Mechanical Engineering Graduate School Kongju National University Division of Automotive and Mechanical Engineering Kongju National University

The changes in vibration, sound, and sound quality with changes in the driving voltage of a power seat motor from 12.5 to 14.5 V were measured and analyzed, which was used in real vehicles. BSR(buzz, squeak, rattle), which occurs for the power seat mechanism during sliding operation, was also evaluated. In addition, the results were expressed in terms of sound quality metrics, which measure the RPM change and sound level versus voltage to analyze their statistical correlation. Furthermore, vibration measurement and analysis were conducted simultaneously to determine the noisiest conditions and the source of the noise. The changes in RPM and voltage of a motor, in addition to vibration and noise, were measured at the same time to determine how noise, RPM, and voltage are interrelated.

关键词： seat vibration seat noise sound quality voltage buzz squeak and rattle(BSR)