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Surface Tension and Temperature Effect on Entrapment of Bubbles and Particles in Continuous Casting of Steel

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Journal of Iron and Steel Research International 2011年第S2期18卷 220-226页

作者： sang-Min Lee sang-joon kim Hae-Geon Lee Graduate Institute of Ferrous Technology Pohang University of Science and Technology 31 San Pohang kyoungbuk Korea

The entrapment behavior of Ar bubbles onto the solidifying front of molten steel in the continuous casting mold was investigated. The dynamic model of bubble and particle entrapment was developed in order to consider the effect of surface tension gradient induced forces(Marangoni force) due to the gradient of sulfur concentration and temperature. The numerical analysis and water model experiment were performed to apply the present model for various conditions. The calculation result is compared with experimental results and plant data in continuous casting mold as well. It shows that the thermal Marangoni force could play an important role and this model predicts the bubble behavior in the vicinity of solid/liquid interface more precisely.

关键词： bubble continuous casting surface tension gradient marangoni force

Design of Authoring Tool for Static and Dynamic Projection Mapping

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Computers, Materials & Continua 2021年第1期66卷 1-16页

作者： sang-joon kim Nammee Moon Min Hong Gooman Park Yoo-Joo Choi Seoul National University of Science and Technology 172 Gongneung-dongNowon-guSeoulKorea Hoseo University 165 Sechul-ri Baebang-eupAsan-siChungcheongnam-doKorea Soonchunhyang University 336-745Asan-siChungcheongnam-doKorea Seoul Media Institute Technology 661 Deungchon-dongGangseo-guSeoulKorea

This study introduces the design details of a tool to create interactive projection-mapping content in a convenient *** the proposed tool design,a homography-based camera–projector calibration method was applied with the use of red–green–blue-depth images from a Kinect V2 sensor that did not require accurate camera calibration *** addition,the proposed tool simultaneously achieved static projection mapping that projected the image content onto a fixed object,and dynamic projection mapping that projected the image content onto a user’s body,by tracing the moving *** verify the effectiveness of the proposed content-creation tool,users with no programming capabilities were employed to create contents that were projected onto various objects in fixed positions and a user’s body in various poses,thereby analyzing the tool’s ***,the projection accuracy was analyzed at different depth positions,and the projection-mapping accuracy was verified with the use of the proposed method.

关键词： Dynamic projection mapping camera-projector calibration Kinect projection mapping content authoring tool

Molecules in the Atmospheres of Giant Planets and Comets

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天文研究与技术 1999年第S1期 190-196页

作者： sang joon kim Department of Astronomy and Space Science Kyunghee University, Suwon, 449 701 KOREA e mail sjkim@khobs kyunghee ac kr

Spectroscopic observations of planets and comets from Earth based observatories and spaceborne observatories during the last 3 decades have produced a long list of molecules, radicals, and ions. The molecules in the atmospheres of giant planets and in the comae of comets have been considered to have a clue to the chemical evolution of the solar system from local interstellar clouds to the current solar system. The detection chronology of these molecules, and gradual improvement of our understanding of the chemistry of the molecules in the atmospheres are presented. Recent findings of new molecules in bright comets Hale Bopp (C/1995 O1) and Hyakutake (C/1996 B2) using infrared and radio telescopes are highlighted. Implications of the abundances of these molecules and isotopic ratios in the atmospheres are discussed.

关键词： Nature

血栓抽吸切除术治疗急性完全性颈动脉球阻塞二例

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介入放射学杂志 2006年第5期15卷 319-320页

作者：徐高峰 Dae Chul Suh Choong Gon Choi Won kim Jae Kyun kim sang joon kim 江苏盐城市第一人民医院放射科 224006 韩国Ulsan大学医学院Asan医疗中心放射科韩国Ulsan大学医学院Asan医疗中心急诊科 Konyang大学医学院放射科

动脉内溶栓治疗已经逐渐成为急性缺血性脑梗塞的最有效的治疗方法,但对于急性颈动脉完全性阻塞引起的脑梗死,由于溶栓药物进入颅内循环困难,动脉内溶栓治疗可被延误和阻止.自2000年以来,我们采用动脉内血栓抽吸切除术治疗2例急性颈动脉... 详细信息

动脉内溶栓治疗已经逐渐成为急性缺血性脑梗塞的最有效的治疗方法,但对于急性颈动脉完全性阻塞引起的脑梗死,由于溶栓药物进入颅内循环困难,动脉内溶栓治疗可被延误和阻止.自2000年以来,我们采用动脉内血栓抽吸切除术治疗2例急性颈动脉球完全性阻塞患者,阻塞颈动脉立即获得再通,疗效明显.现报道如下.

关键词：急性缺血性脑梗塞治疗方法颈动脉完全性切除术阻塞抽吸血栓动脉内溶栓治疗溶栓药物

Wearable Triboelectric Nanogenerators Based on Printed Polyvinylidene Fluoride Films Incorporated with Cobalt-Based Metal-Organic Framework for Self-Powered Mobile Electronics

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Energy & Environmental Materials 2024年第4期7卷 396-403页

作者： Myeong-Hyeon kim sang-joon Park Tae-Jun Ha Department of Electronic Materials Engineering Kwangwoon UniversitySeoul 01897Korea

In this study,wearable triboelectric nanogenerators comprising bar-printed polyvinylidene fluoride(PVDF)films incorporated with cobalt-based metal-organic framework(Co-MOF)were *** enhanced output performance of the TENGs was attributed to the phase transition of PVDF from a-crystals toβ-crystals,as facilitated by the incorporation of the *** synthesis conditions,including metal ion,concentration,and particle size of the MOF,were optimized to increase open-circuit voltage(VOC)and open-circuit current(I_(SC))of PVDF-based *** addition to high operational stability,mechanical robustness,and long-term reliability,the developed TENG consisting of PVDF incorporated with Co-MOF(Co-MOF@PVDF)achieved a VOC of 194 V and an I_(SC)of 18.8μ***,the feasibility of self-powered mobile electronics was demonstrated by integrating the developed wearable TENG with rectifier and control units to power a global positioning system(GPS)*** local position of the user in real-time through GPS was displayed on a mobile interface,powered by the battery charged through friction-induced electricity generation.

关键词： bar printing phase transition polyvinylidene fluoride incorporated with cobalt-based metal-organic framework self-powered mobile electronics wearable triboelectric nanogenerators

Adhesion and Suction Functions of the Tip Region of a Nectar-drinking Butterfly Proboscis

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Journal of Bionic Engineering 2017年第4期14卷 600-606页

作者： Seung Chul Lee Jun Ho kim sang joon Lee Department of Mechanical Engineering Pohang University of Science and Technology Pohang 37673 Gyeongbuk Republic of Korea Center for Biofluid and Biomimic Research Pohang University of Science and Technology Pohang 37673 Gyeongbuk Republic of Korea

In this study, we investigated the dynamic functions of the tip region of the butterfly proboscis through which liquid is sucked during liquid feeding. The microstructures and flow patterns in the tip region of the proboscis were in vivo analyzed. The tip region can be divided into two functional sections： namely adhesion and suction sections. The liquid adheres to the adhesion section during liquid suction. Although the tip region has numerous slits connected to food canal of the proboscis, liquid is mainly sucked through the suction section, which section is submerged in the fluid pulled by the adhesion section and then successfully imbibes liquid. To check the dynamic functions of the tip region, we fabricated a suction tip model having adhesion and suction parts. The in vitro model experiments show that the hydrophilicity of the adhesion part and the existence of the suction inlet improve the liquid uptake driven by a suction pump. This study may provide insights for the biomimetic design of nectar-feeding butterflies.

关键词： butterfly proboscis nectar-feeding strategy suction

Dynamic observation of dendrite growth on lithium metal anode during battery charging/discharging cycles

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npj Computational Materials 2022年第1期8卷 960-972页

作者： Hae Gon Lee Se Young kim joon sang Lee Next Generation Battery Research Center Korea Electrotechnology Research Institute(KERI)12Jeongiui-gilSeongsan-guChangwon-siGyeongsangnam-do51543Republic of Korea Department of Mechanical Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul03722Republic of Korea

Lithium metal is considered one of the most promising anode materials for application in next-generation ***,despite decades of research,practical application of lithium metal batteries has not yet been achieved because the fundamental interfacial mechanism of lithium dendrite growth is not yet fully *** this study,a series of reactive molecular dynamics (MD) simulations was performed to investigate the electrochemical dynamic reactions at the electrode/electrolyte *** allows quantitative characterization of morphological phenomena and real-time interfacial visualization of the dynamic growth of dead lithium and dendrites during repeated *** computational protocol was utilized to investigate the dendrite mitigation mechanism when an electrolyte additive (hydrogen fluoride) is dissolved in an organic ethylene carbonate (EC) electrolyte *** was confirmed that beneficial decomposition reactions between electrolyte components form a protective film on the anode surface,suppressing large interphase volume changes and unnecessary degradation reactions.

关键词： battery lithium electrolyte

A metallic anti-biofouling surface with a hierarchical topography containing nanostructures on curved micro-riblets

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Microsystems & Nanoengineering 2022年第1期8卷 83-96页

作者： Taekyung kim Sunmok Kwon Jeehyeon Lee joon sang Lee Shinill Kang National Center for Optically-assisted high precision Mechanical Systems Yonsei UniversitySeoul 03722Korea School of Mechanical Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Korea

Metallic surface finishes have been used in the anti-biofouling,but it is very difficult to produce surfaces with hierarchically ordered *** the present study,anti-biofouling metallic surfaces with nanostructures superimposed on curved micro-riblets were produced via top-down *** to the attachment theory,these surfaces feature few attachment points for organisms,the nanostructures prevent the attachment of bacteria and algal zoospores,while the micro-riblets prohibit the settlement of *** oxidation was performed to induce *** forms a hydration layer on the surface,which physically blocks foulant adsorption along with the anti-biofouling *** characterized the surfaces via scanning electron and atomic force microscopy,contact-angle measurement,and wear-resistance *** contact angle of the hierarchical structures was less than 1°.Laboratory settlement assays verified that bacterial attachment was dramatically reduced by the nanostructures and/or the hydration layer,attributable to *** micro-riblets prohibited the settlement of *** 77 days of static immersion in the sea during summer,the metallic surface showed significantly less biofouling compared to a surface painted with an anticorrosive coating.

关键词： Anti-biofouling Superhydrophilic Hierarchical topography Metallic engineered surface Nanoimprinting,static immersion test,field trials

GRU-based Buzzer Ensemble for Abnormal Detection in Industrial Control Systems

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Computers, Materials & Continua 2023年第1期74卷 1749-1763页

作者： Hyo-Seok kim Chang-Gyoon Lim sang-joon Lee Yong-Min kim Interdisciplinary Program of Information Security Chonnam National UniversityGwangju61186Korea Major in Computer Engineering Chonnam National UniversityYeosu59626Korea School of Business Administration Chonnam National UniversityGwangju61186Korea Department of Electronic Commerce Chonnam National UniversityYeosu59626Korea

Recently,Industrial Control Systems(ICSs)have been changing from a closed environment to an open environment because of the expansion of digital transformation,smart factories,and Industrial Internet of Things(IIoT).Since security accidents that occur in ICSs can cause national confusion and human casualties,research on detecting abnormalities by using normal operation data learning is being actively *** single technique proposed by existing studies does not detect abnormalities well or provide satisfactory *** this paper,we propose a GRU-based Buzzer Ensemble for AbnormalDetection(GBE-AD)model for detecting anomalies in industrial control systems to ensure rapid response and process *** newly proposed ensemble model of the buzzer method resolves False Negatives(FNs)by complementing the limited range that can be detected in a single model because of the internal models composing *** the internal models remain suppressed for False Positives(FPs),GBE-AD provides better *** addition,we generated mean prediction error data in GBE-AD and inferred abnormal processes using soft and hard *** confirmed that the detection model’s Time-series Aware Precision(TaP)suppressed FPs at 97.67%.The final performance was 94.04%in an experiment using anHIL-basedAugmented ICS(HAI)Security Dataset(ver.21.03)among public datasets.

关键词： Industrial control system abnormal detection ensemble learning HAI dataset