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Underground Space 2022年第6期7卷 967-989页

作者： Kok-kwang Phoon Jianye Ching Zijun Cao Singapore University of Technology and Design 487372Singapore Dept of Civil Engineering Taiwan UniversityTaipeiTaiwan 10617China State Key Laboratory of Water Resources and Hydropower Engineering Science Institute of Engineering Risk and Disaster PreventionWuhan UniversityWuhan 430072China

The purpose of this paper(presented online as a keynote lecture at the 25th Annual Indonesian Geotechnical Conference on 10 Nov 2021)is to broadly conceptualize the agenda for data-centric geotechnics,an emerging field that attempts to prepare geotechnical engineering for digital *** agenda must include(1)development of methods that make sense of all real-world data(not selective input data for a physical model),(2)offering insights of significant value to critical real-world decisions for current or future practice(not decisions for an ideal world or decisions of minor concern to geotechnical engineers),and(3)sensitivity to the physical context of geotechnics(not abstract data-driven analysis connected to geotechnics in a peripheral way,i.e.,engagement with the knowledge and experience base should be substantial).These three elements are termed“data centricity”,“fit for(and transform)practice”,and“geotechnical context”in the *** that a knowledge of the site is central to any geotechnical engineering project,datadriven site characterization(DDSC)must constitute one key application domain in data-centric geotechnics,although other infrastructure lifecycle phases such as project conceptualization,design,construction,operation,and decommission/reuse would benefit from data-informed decision support as *** part of DDSC that addresses numerical soil data in a site investigation report and soil property databases is pursued under Project *** principle,the source of data can also go beyond site investigation,and the type of data can go beyond numbers,such as categorical data,text,audios,images,videos,and expert *** purpose of Project DeepGeo is to produce a 3D stratigraphic map of the subsurface volume below a full-scale project site and to estimate relevant engineering properties at each spatial point based on actual site investigation data and other relevant Big Indirect Data(BID).Uncertainty quantification is necessary,as curr

关键词： Data-centric geotechnics Bayesian machine learning Data-driven site characterization(DDSC) Project DeepGeo Data-informed decision support index

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Electrocrystallization of monodisperse Nanocrystal Copper on Highly Oriented Pyrolytic Graphite Electrode

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Chinese Journal of Chemistry 2005年第2期23卷 121-126页

作者：黄令 LEE,Eun-Sung KIM,kwang-Bum DepartmentofChemistry XiamenUniversityXiamenFujian361005China DepartmentofMetaUurgicalEngineering YonseiUniversitySeoul120-749SouthKorea

Mechanism of copper electrocrystallization on highly oriented pyrolytic graphite electrode from a solution of 1 mmol/L CuSO 4 and 1.0 mol/L H 2 SO 4 has been studied using cyclic voltammogram and chronoamperometry. The results show that in copper electrodeposition the charge‐transfer step is fast and the rate of growth is controlled by the rate of mass transfer of copper ions to the growing centers. Reduction of Cu(II) ions did not undergo underpotential deposition. The initial deposition kinetics of Cu electrocrystallization corresponds to a model including progressive nucleation and diffusion controlled growth. Copper nanocrystals with size of 75.6 nm and relative standard deviation of 9% can be obtained by modulation potential electrodeposition.

关键词： electrocrystallization electrodeposition nucleation and growth nanocrystal copper

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Corrosion behavior of Mg-Mn-Ca alloy:Influences of Al,Sn and Zn

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Journal of Magnesium and Alloys 2019年第1期7卷 38-46页

作者： Ahmad Bahmani Srinivasan Arthanari kwang Seon Shin Magnesium Technology Innovation Center School of Materials Science and EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea

The effects of different elements including Al,Sn and Zn with ability of solution hardening on corrosion behavior of a Mg alloy have been *** microstructure was analyzed and the electrochemical and immersion techniques were used for corrosion *** kelvin probe force microscopy(SKPFM)was utilized to analyze the volta-potential distribution on the *** was found that all additives reduced the corrosion resistance;however,Zn decreased the corrosion resistance less than Al and *** corrosion rate was quantitatively explained through volta-potential difference and the second phase fraction.

关键词： Magnesium alloy Extrusion Corrosion rate Volta-potential Secondary phase

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Effects of fractional-order PI controller on delay margin in single-area delayed load frequency control systems

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Journal of modern Power Systems and Clean Energy 2019年第2期7卷 380-389页

作者： Vedat CELIK Mahmut Temel OZDEMIR kwang Y.LEE Department of Electrical and Electronics Engineering Faculty of EngineeringFirat UniversityElazigTurkey Department of Electrical and Computer Engineering Baylor UniversityWacoUSA

This study aims to determine the improvement effect on the delay margin if fractional-order proportional integral(PI) controller is used in the control of a singlearea delayed load frequency control(LFC) system. The delay margin of the system with fractional-order PI control has been obtained for various fractional integral orders and the effect of them has been shown on the delay margin as a third controller parameter. Furthermore,the stability of the system that is either under or over the delay margin is examined by generalized modified Mikhailov *** stability results obtained have been confirmed numerically in time domain. It is demonstrated that the proposed controller for delayed LFC system provides more flexibility on delay margin according to integer-order PI controller.

关键词： Delay dependent stability Delay margin Fractional-order proportional integral(PI) Generalized modified Mikhailov criterion Load frequency control with delay

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Analysis of the current density characteristics in through-mask electrochemical micromachining(TMEMM) for fabrication of micro-hole arrays on invar alloy film

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Chinese Journal of Aeronautics 2017年第3期30卷 1231-1241页

作者： Da-som JIN kwang-ho CHUN Eun-sang LEE School of Mechanical Engineering Inha University Incheon 22212 Republic of Kore Department of Mechanical Engineering Inha University Incheon 22212 Republic of Korea

Invar alloy consisting of 64% iron and 36% nickel has been widely used for the production of shadow masks for organic light emitting diodes（OLEDs） because of its low thermal expansion coefficient（1.86 × 10^-6cm/°C）.To fabricate micro-hole arrays on 30 lm invar alloy film,through-mask electrochemical micromachining（TMEMM） was developed and combined with a portion of the photolithography etching *** precise hole shapes,patterned photoresist（PR） film was applied as an insulating *** investigate the relationship between the current density and the material removal rate,the principle of the electrochemical machining was studied with a focus on the *** finite element method（FEM） was used to verify the influence of each parameter on the current density on the invar alloy film *** parameters considered were the thickness of the PR mask,inter-electrode gap（IEG）,and electrolyte *** of experiments（DOE） was used to figure out the contribution of each parameter.A simulation was conducted with varying parameters to figure out their relationships with the current *** was conducted to select the suitable *** experiment was carried out to verify the simulation *** was possible to fabricate micro-hole arrays on invar alloy film using TMEMM,which is a promising method that can be applied to fabrications of OLEDs shadow masks.

关键词： Electrochemical Invar alloy film Micromachining OLED shadow mask Photoresist film mask(PR film mask) Through-mask electrochemical micromachining(TMEMM)

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Why Does the US Face Greater Disadvantages in the Trade War with China?

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China & World Economy 2020年第2期28卷 113-122页

作者： Yew-kwang Ng School of Economics Fudan UniversityChina

The rhetoric used by President Trump regarding the trade war against China is rife with *** actual American trade deficit'with China is much lower if evaluated in the correct terms of *** deficit is mainly a result of insufficient domestic US *** addition,as the US dollar is an international currency which is being increasingly held as a result of increases in world population,income,prices and transaction intensity,Americans can benefit from having trade deficits of hundreds of billions of US dollars each *** analysis,as well as a model of the Bank of England,reveals that the trade war is not only mutually harmful but also actually hurts America more than *** Thucydides Trap is likely avoidable in the current nuclear era of assured mutual destruction and because China,facing many structural impediments,is still far behind America in technology and military powder.

关键词： Japan Sino-American relationship Thucydides Trap trade war Trump

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Concerns about how to simultaneously determine microvascular invasion and pathological response after transarterial chemoembolization before hepatocellular carcinoma surgery

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Hepatobiliary Surgery and Nutrition 2023年第5期12卷 815-817页

作者： kwang Yeol Paik Department of Surgery Yeouido St.Mary’s HospitalThe Catholic University of Korea College of MedicineSeoulKorea

Microvascular invasion(MVI)is classified as the strongest risk factor for recurrence and poor prognosis after surgical treatment of hepatocellular carcinoma(HCC).The same results after liver transplantation reflect ho... 详细信息

关键词： Microvascular invasion(MVI) transarterial chemoembolization(TACE) hepatocellular carcinoma(HCC)

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Influence of Vanadium Content on Bainitic Transformation of a Low-Carbon Boron Steel During Continuous Cooling

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Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 692-698页

作者： kwang-Su Kim Lin-Xiu Du Cai-Ru Gao State Key Laboratory of Rolling and Automation Northeastern University Department of Materials Kim Chaek University of Technology

The phase transformation behaviors during continuous cooling of low-carbon boron steels with different vanadium contents were studied by means of dilatometric measurement and microstructure observation. The bainite transformation behavior is not noticeably altered when the vanadium content is 0.042 and 0.086 wt%, and these steels exhibit full bainitic microstructure even at a cooling rate of 5 ℃/s. When vanadium content is increased to 0.18 wt%, ferrite is still present in the microstructure even at a cooling rate of 40 ℃/s. Vickers hardness of the steels with 0.042 and 0.086 wt% V is remarkably higher than that of the steel with 0.18 wt% V at a cooling rate higher than 10 ℃/s, and the difference is increased with the increase in cooling rate. moreover, the amount of coarse vanadium precipitates formed in austenite is increased with the increase in vanadium content. The optimum content of vanadium to obtain bainitic microstructure is 0.086 wt% in this experimental low-carbon boron steels.

关键词： Microalloyed steel Vanadium Bainitic transformation Boron Microstructure

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Influences of the Welding Heat Input and the Repeated Repair Welding on Ti–3Al–2.5V Titanium Alloy

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Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 684-691页

作者： Hui-Jun Yi Yong-Jun Lee kwang-O Lee School of Mechanical Engineering Pusan National University

The primary purpose of this study was to determine the effects of gas tungsten arc welding heat input on the high-temperature tensile properties, toughness, and microstructural features of titanium alloy Ti-3A1-2.5V. The secondary objective was to examine the effect of the repeated repair welding on the properties of the alloy. It was also found that the mechanical properties progressively decreased with increasing the repair welding cycles, especially in the case of the weldment after the first welding repair. It was observed that the sizes of the acicular and prior β grain boundaries as well as the volume fraction of the acicular phases increased with increasing the welding heat input. In addition, the amount and size of the acicular a1 phases were found to increase with increasing the repair welding cycles.

关键词： Ti-3AI-2.5V Repair welding Heat input Tensile properties Microstructure

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Broadcast-Based Spatial Queries

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Journal of Computer Science & Technology 2005年第6期20卷 811-821页

作者： kwang-Jin Park moon-Bae Song Chong-Sun Hwang Department of Computer Science and Engineering Korea University 5-1 Anam-Dong Seongbuk-Ku Seoul 136-701 Korea

Indexing techniques have been developed for wireless data broadcast environments, in order to conserve the scarce power resources of the mobile clients. However, the use of interleaved index segments in a broadcast cycle increases the average access latency for the clients. In this paper, the broadcast-based spatial query processing methods （BBS） are presented for the location-based services. In the BBS, broadcasted data objects are sorted sequentially based on their locations, and the server broadcasts the location dependent data along with an index segment. Then, a sequential prefetehing and caching scheme is designed to reduce the query response time. The performance of this scheme is investigated in relation to various environmental variables, such as the distributions of the data objects, the average speed of the clients and the size of the service area.

关键词： broadcasting location-aware caching prefetching mobile computing

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