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Design and performance simulation of a molecular Doppler wind lidar

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Chinese Optics Letters 2009年第7期7卷 593-597页

作者：沈法华 Hyunki Cha 董吉辉 Dukhyeon kim 孙东松 Sung Ok Kwon Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Korea Atomic Energy Research Institute Hanbat National University

A mobile molecular Doppler wind lidar at an eye-safe wavelength of 355 nm based on double-edge technique is being built in Hefei （China） for wind measurement from 10-to 40-km altitude. The structure of this lidar system is described. A triple Fabry-Perot etalon is employed as a frequency discriminator whose parameters are optimized. The receiver system is designed to achieve compactness and stability by putting in a standard 19-inch socket bench. Simulation results show that within the wind speed dynamic range of ±100 m/s, the horizontal wind errors due to noise are less than 1 m/s bdow 20-km altitude for 100-m vertical resolution, and less than 5.5 m/s from 20 km up to 40 km for 500-m vertical resolution with 400-mJ laser energy, 30-min temporal resolution, and a 45-cm aperture telescooe.

关键词： Optical radar

An in vivo Evaluation of Ultra-fine Grained Titanium Implants

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Journal of Materials Science & Technology 2009年第4期25卷 556-560页

作者： S. Bindu K.P. Sanosh K. Smetana A. Balakrishnan T.N. kim Department of Life Science and Genetic Engineering Paichai University Department of Information and Electronic Materials Engineering Paichai University Charles University 1st and 2nd Faculty of MedicineInstitute of Anatomy and Center of Cell Therapy and Tissue Repair

The present work focuses mainly on an in vivo evaluation of ultra fine grained titanium （UFG-Ti） obtained by severe plastic deformation （SPD）. The SPD on commercially produced Grade 2 titanium （Cp-Ti） resulted in the refinement of the grain size by several orders of magnitude. Polished surfaces having similar roughness from both UFG-Ti and Cp-Ti were prepared. In vitro test revealed the presence of fibronectin, which was involved in the attachment of the cells to the substrate. Phase contrast micrographs showed the highest signal of fibronectin in UFG-Ti, indicating that it is more cytocompatible than Cp-Ti. In vivo tests, by subcutaneous implantation of the metals in the rats showed the better biocompatibility of UFG-Ti over Cp-Ti. The improved biocompatibility of UFG-Ti was attributed to the presence of surface discontinuities （in the form of nano-defects）, surface energy, higher wettability, surface stress and stable TiO2 films, which increased the protein adsorption on the surface.

关键词： Surfaces Grain size Titanium In vivo Biocompatibility

Nicolau syndrome: A literature review

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World Journal of Dermatology 2015年第2期4卷 103-107页

作者： kwang-Kyoun kim Dong-Sik Chae Department of Orthopedic Surgery Konyang University Hospital Department of Orthopedic Surgery International St. Mary’s Hospital Catholic Kwandong University College of Medicine

Nicolau syndrome(NS) is a rare cutaneous adverse reaction after intra-muscular or intra-articular injection. Clinical features of NS are presented by three typical phases(initial, acute and necrotic phases). The cause of NS is acute vasospasm, inflammation of arteries and thromboembolic occlusion of arteriole related various drugs. Many results of laboratory test, imaging studiesand histopathology are reported and are associated with disease status. Three phase treatment is recommended for the patients with NS. Initially pain control and rule out differential diagnosis and in acute phase steroid therapy, heparin and pentoxifylline are useful. In necrotic phase, surgical treatment is needed depending on size of the affected site. NS is not well understood so far, however three phase treatment could lead to good result on basis of literature review.

关键词： Nicolau syndrome Livedoid dermatitis Embolia Cutis Medicamentosa Drug hypersensitivity Dermatitis Diclofenac

Complete characterization of ultrafast optical fields by phase-preserving nonlinear autocorrelation

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Light(Science & Applications) 2022年第10期11卷 2451-2462页

作者： Alexander Gliserin Soo Hoon Chew Seungchul kim Dong Eon kim Department of Optics and Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National University2 Busandaehak-ro 63beon-gilBusan 46241South Korea Department of Cogno Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National University2 Busandaehak-ro 63beon-gilBusan 46241South Korea Max Planck Center for Attosecond Science Max Planck POSTECH/Korea Research Initiative77 Cheongam-roPohang 37673South Korea Department of Physics Center for Attosecond Science and TechnologyPohang University of Science and Technology77 Cheongam-roPohang 37673South Korea

Nonlinear autocorrelation was one of the earliest and simplest tools for obtaining partial temporal information about an ultrashort optical pulse by gating it with ***,since the spectral phase is lost in a conventional autocorrelation measurement,it is insufficient for a full characterization of an ultrafast electric field,requiring additional spectral information for phase ***,we show that introducing an intensity asymmetry into a conventional nonlinear interferometric autocorrelation preserves some spectral phase information within the autocorrelation signal,which enables the full reconstruction of the original electric field,including the direction of time,using only a spectrally integrating *** call this technique Phase-Enabled Nonlinear Gating with Unbalanced Intensity(PENGUIN).It can be applied to almost any existing nonlinear interferometric autocorrelator,making it capable of complete optical field characterization and thus providing an inexpensive and less complex alternative to methods relying on spectral measurements,such as frequency-resolved optical gating(FROG)or spectral phase interferometry for direct electric-field reconstruction(SPIDER).More importantly,PENGUIN allows the precise characterization of ultrafast fields in non-radiative(e.g.,plasmonic)nonlinear optical interactions where spectral information is *** demonstrate this novel technique through simulations and experimentally by measuring the electric field of~6-fs laser pulses from a Ti:sapphire *** results are validated by comparison with the well-established FROG method.

关键词： autocorrelation nonlinear characterization

Evaluation of microstructure and mechanical properties of Mg-xCe-0.5Zn alloys by nano-indentation

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Transactions of Nonferrous Metals Society of China 2010年第7期20卷 1240-1243页

作者： K.C.PARK B.H.kim Y.H.PARK I.M.PARK Department of Material Science and Engineering Pusan National UniversitySan 30 Jangjeon-dongGeumjeong-guBusan 609-735Korea

The microstructure and mechanical properties of Mg-xCe-0.5Zn （x=0.5, 1.5, 2.5, molar fraction, %） alloys were examined using a nano-indentation technique. The alloys were fabricated using a vacuum induction melting method under an argon atmosphere The microstruetures of Mg-xCe-0.5Zn alloys mainly consist ofa-Mg and eutectic Mg12Ce phase. The volume fraction and size of the eutectic Mgl2Ce phase increase with increasing Ce contents. Nano-indentation test results show that the indentation hardness and elastic modulus of the eutectic Mg12Ce phase are higher than those of the a-Mg matrix. In addition, the mean indentation hardness and elastic modulus of the Mg-xCe-0.5Zn alloys increase with the Ce addition amount increasing.

关键词： Mg alloys Mg-Ce-Zn rare earth microstructure mechanical properties nano-indentation

Micromagnetics and Signal Analysis of Shielded Spin-Valve Multilayer

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Chinese Physics Letters 1996年第6期13卷 469-472页

作者： ZHANG Huai-wu YANG Shi-qing LIU Ying-li WANG Hao-cai H.J.kim Institute of Materials and Information Engineering University of Electronic Science and TechnologyChengdu 610054 Magnetic Alloy Laboratory Metals DivisionKorea Institute of Science and TechnologyP.O.Box 131ChenogryangSeoulKorea

In order to linearize a spin-valve giant magnetoresistance head,the exchanges layer sputtered at fringe area or a permanent magnet layer longitudinal biasing for domain stabilization based on a physical calculated model may be *** correlations between the head performance characteristic and head geometric parameters have been simulated by putting the head on a suitable front-end electric *** simulative results show that the optimal sensing current is from 10 to 40mA and the linear geometric parameteres for gap width are at the range of G_(1)+G_(2)≤0.5μm.

关键词： stabilization permanent Signal

Enhancing Hydrophilicity of Thick Electrodes for High Energy Density Aqueous Batteries

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Nano-Micro Letters 2023年第7期15卷 110-121页

作者： Jungeun Lee Hyeonsoo Lee Cheol Bak Youngsun Hong Daeha Joung Jeong Beom Ko Yong Min Lee Chanhoon kim Sustainable Technology and Wellness R&D Group Korea Institute of Industrial Technology(KITECH)102 Jejudaehak-RoJeju-SiJeju-do 63243Republic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea Department of Physics Virginia Commonwealth UniversityRichmondVA 23284USA

Thick electrodes can substantially enhance the overall energy density of ***,insufficient wettability of aqueous electrolytes toward electrodes with conventional hydrophobic binders severely limits utilization of active materials with increasing the thickness of electrodes for aqueous batteries,resulting in battery performance deterioration with a reduced ***,we demonstrate that controlling the hydrophilicity of the thicker electrodes is critical to enhancing the overall energy density of *** binders are synthesized via a simple sulfonation process of conventional polyvinylidene fluoride binders,considering physicochemical properties such as mechanical properties and *** introduction of abundant sulfonate groups of binders(i)allows fast and sufficient electrolyte wetting,and(ii)improves ionic conduction in thick electrodes,enabling a significant increase in reversible capacities under various current ***,the sulfonated binder effectively inhibits the dissolution of cathode materials in reactive aqueous ***,our findings significantly enhance the energy density and contribute to the development of practical zinc-ion batteries.

关键词： Thick electrodes Hydrophilic binder Sulfonation Aqueous zinc-ion batteries High areal capacity

Local probing of the non-uniform distribution of ferrielectric and antiferroelectric phases

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Nano Research 2023年第2期16卷 3021-3027页

作者： Huimin Qiao Fangping Zhuo Zhen Liu Jinxing Wang Jeongdae Seo Chenxi Wang Jinho Kang Bin Yang Yunseok kim School of Advanced Materials and Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Research Center for Advanced Materials Technology Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany Department of Physics College of ScienceNortheast Forestry UniversityHarbin 150040China Department of Physics Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea School of Instrumentation Science and Engineering Harbin Institute of TechnologyHarbin 150080China

Piezoresponse force microscopy(PFM)is an indispensable tool in the investigation of local electromechanical responses and polarization *** acquired data provide spatial information on the local disparity of polarization switching and electromechanical responses,making this technique advantageous over macroscopic *** its widespread application in ferroelectrics,it has rarely been used to investigate the ferrielectric(FiE)behaviors in antiferroelectric(AFE)***,the PFM was utilized to study the local electromechanical behavior and distribution of FiE,and the AFE phases of PbZrO_(3)thin-film were studied,where only the FiE behavior is observable using a macroscopic *** FiE region resembles a ferroelectric material at low voltages but exhibits a unique on-field amplitude response at high *** contrast,the AFE region only yields an observable response at high ***-field simulations reveal the coexistence of AFE and FiE states as well as the phase-transition processes that underpin our experimental *** work illustrates the usefulness of PFM as an analytical tool to characterize AFE/FiE materials and their phase-coexistence behavior,thereby providing insights to guide property modification and potential applications.

关键词： scanning probe microscopy ferrielectrics antiferroelectrics local electromechanical response

Multilevel resistive switching and synaptic plasticity of nanoparticulated cobaltite oxide memristive device

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Journal of Materials Science & Technology 2021年第19期78卷 81-91页

作者： Tukaram D.Dongale Atul C.Khot Ashkan V.Takaloo Kyung Rock Son Tae Geun kim School of Electrical Engineering Korea University.Anam-ro 145.Seongbuk-guSeoul 02841Republic of Korea School of Nanoscience and Biotechnology Shivaji UniversityKolhapur 416004India

Multilevel resistive switching(RS)is a key property to embrace the full potential of memristive devices for non-volatile memory and neuromorphic computing *** this study,we employed nanoparticulated cobaltite oxide(Co_(3)O_(4))as a model material to demonstrate the multilevel RS and synaptic learning capabilities because of its multiple and stable redox state *** Pt/Co_(3)O_(4)/Pt memristive device exhibited tunable RS properties with respect to different voltages and compliance currents(CC)without the electroforming *** is,the device showed voltage-dependent RS at a higher CC whereas CC-dependent RS was observed at lower *** device showed four different resistance states during endurance and retention measurements and non-volatile memory results indicated that the CC-based measurement had less ***,we investigated the basic and complex synaptic plasticity properties using the analog current-voltage characteristics of the Pt/Co_(3)O_(4)/Pt *** particular,we mimicked the potentiation–depression and four-spike time-dependent plasticity(STDP)rules such as asymmetric Hebbian,asymmetric anti-Hebbian,symmetric Hebbian,and symmetric antiHebbian learning *** results of the present work indicate that the cobaltite oxide is an excellent nanomaterial for both multilevel RS and neuromorphic computing applications.

关键词： Multilevel resistive switching Synaptic plasticity STDP Cobaltite oxide Memristive device