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Mixed-dimensional stacked nanocomposite structures for a specific wavelength-selectable ambipolar photoresponse

Nano Research 2024年第6期17卷 5549-5558页

作者： Young Jae Park Jaeho Shim Joo song Lee Kyu Seung Lee Ji-Yeon Kim Kang Bok Ko Sang-Youp Yim Seongjun Kim Hoon-Kyu Shin donghee Park Yong Ju Yun dong ick son Institute of Advanced Composite Materials Korea Institute of Science and TechnologyJeollabuk-do 55324Republic of Korea National Institute for Nanomaterials Technology Pohang University of Science and TechnologyGyeongsangbuk-do 37673Republic of Korea Department of Semiconductor Science and Technology Semiconductor Physics Research CenterJeonbuk National UniversityJeonju 54896Republic of Korea Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Center for Opto-Electronic Materials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and TechnologySeoul 02792Republic of Korea Graduate School of Energy and Environment(KU-KIST Green School) Korea UniversitySeoul 02841Republic of Korea KIST School Department of Nanomaterials and Nano ScienceUniversity of Science and Technology(UST)Daejeon 34113Republic of Korea

Mixed-dimensional composite structures using zero-dimensional(0D)quantum dots(QDs)and two-dimensional(2D)transition metal dichalcogenides(TMDs)materials are expected to attract great interest in optoelectronics due to the potential to generate new optical ***,we report on the unique optical characteristics of a devices with mixed dimensional vertically stacked structures based on tungsten diselenide(WSe_(2))/CdSeS QDs monolayer/molybdenum disulfide(MoS_(2))(2D/0D/2D).Specifically,it exhibits an ambipolar photoresponse characteristic,with a negative photoresponse observed in the 400-600 nm wavelength range and a positive photoresponse appeared at 700 nm *** resulted in the high negative responsivity of up to 52.22 mA·W^(−1)under 400 nm,which is 163 times higher than that of the photodetector without CdSeS *** also demonstrated the negative photoresponse,which could be due to increased carrier collision probability and non-radiative *** modeling and simulation reveal that Auger recombination among the types of non-radiative recombination is the main cause of negative photocurrent ***,we discovered ambipolar photoresponse near a specific wavelength corresponding to the energy of quantum *** study revealed interesting phenomenon in the mixed low-dimensional stacked structure and paved the way to exploit it for the development of innovative photodetection materials as well as for optoelectronic applications.

关键词： mixed-dimension quantum dot heterostructure photodetector ambipolar photoresponse

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High-performance photoelectrochemical cells with MoS2 nanoflakes/TiO2 photoanode on 3D porous carbon spun fabric

Advanced Sensor and Energy Materials

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Advanced Sensor and Energy Materials 2024年第1期3卷 1-10页

作者： Hyunjin Cho Ji-Yeon Kim dong Su Shin Joo song Lee Jaeho Shim In-Ho Lee Won Kook Choi Namhee Kwon Soohyung Park Mehmet Suha Yazici Young Jae Park Ju Hee You Seok-Ho Seo donghee Park dong ick son Institute of Advanced Composite Materials Korea Institute of Science and Technology92 Chudong-roBongdong-eupWanju-gunJeollabuk-do55324Republic of Korea Center for Opto-Electronic Materials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and TechnologyHwarangro 14 Gil 5Seongbuk GuSeoul02792Republic of Korea KIST School Department of Nanomaterials and Nano ScienceUniversity of Science and Technology(UST)217Gajeong-roYuseong-guDaejeon34113Republic of Korea Advanced Analysis Center Korea Institute of Science and TechnologyHwarangro 14 Gil 5Sungbuk GuSeoul02792Republic of Korea Energy Institute Istanbul Technical University(ITU)Maslak34467 IstanbulTürkiye Division of Technology Business National Institute of Science and Technology77Cheongam-roNam-GuPohangGyeongbuk37673Republic of Korea

A solar-driven photoelectrochemical(PEC)cell is emerging as one of the promising clean hydrogen generation *** of semiconductor heterojunctions and surface morphologies of photoelectrodes in a PEC cell has been a primitive approach to boost its *** study presents that a molybdenum disulfide(MoS_(2))nanoflakes photoanode on 3-dimensional(3D)porous carbon spun fabric(CSF)as a substrate effectively enhances hydrogen generations due to sufficiently enlarged surface ***_(2)is grown on CSFs utilizing a hydrothermal *** three different MoS_(2)coating morphologies depending on the amount of MoS_(2)precursor and hydrothermal growth time,film shape MoS_(2)on CSFs had the largest surface area,exhibiting the highest photocurrent density of 26.48 mA/cm^(2)and the highest applied bias photon-to-current efficiency(ABPE)efficiency of 5.32%at 0.43 ***,with a two-step growth method of sputtering and a subsequent hydrothermal coating,continuous TiO_(2)/MoS_(20 heterojunctions on a porous CSF further promoted the photoelectrochemical performances due to their optimized bandgap *** surface area,enhanced charge transfer,and utilization of visible light enable a highly efficient MoS_(2)/TiO_(2)/CSF photoanode with a photocurrent density of 33.81 mA/cm^(2)and an ABPE of 6.97%at 0.87 *** hydrogen generation amount of the PEC cell with MoS_(2)/TiO_(2)/CSF photoanode is 225.4μmol/L after light irradiation of 60 s.

关键词： Photoelectrochemical cell Photoanode MoS_(2) TiO_(2 3D porous carbon spun fabric Conformal coating

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Refined Functional Equations Stemming from Cubic,Quadratic and Additive Mappings

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Acta Mathematica Sinica,English Series 2009年第10期25卷 1595-1608页

作者： ick-Soon CHANG Eunyoung son Hark-Mahn KIM Department of Mathematics Mokwon University Department of Mathematics Chungnam National University

Let n ≥ 2 be an integer. In this paper, we investigate the generalized Hyers-Ulam stability problem for the following functional equation f（n-1∑j=1 xj＋2xn）＋f（n-1∑j=1 xj-2xn）＋8 n-1∑j=1f（xj）=2f（n-1∑j=1 xj... 详细信息

关键词： generalized Hyers-Ulam stability functional equations cubic mappings quadratic mappings difference operator

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Extraordinary Ultrahigh-Capacity and Long Cycle Life Lithium-Ion Batteries Enabled by Graphitic Carbon Nitride-Perylene Polyimide Composites

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Energy & Environmental Materials 2023年第6期6卷 199-226页

作者： Michael Ruby Raj Jungwon Yun dong-kyu son Gibaek Lee Advanced Energy Materials Design Lab School of Chemical EngineeringYeungnam University38541Gyeongsan-siKorea William G.Lowrie Chemical and Biomolecular Engineering The Ohio State UniversityColumbus OH 43210USA

Graphitic carbon nitride(g-C_(3)N_(4))is widely used in organic metal-ion batteries owing to its high porosity,facile synthesis,stability,and high-rate ***,pristine g-C_(3)N_(4)nanosheets exhibit poor electrical conductivity,irreversible metal-ion storage capacity,and short-term cycling owing to their high concentration of graphitic-N ***,a series of 3,4:9,10-perylenetetracarboxylic diimide-coupled g-C_(3)N_(4)composite anode materials,CN-PI_(x)(x=0.2,0.5,0.75,and 1),was investigated,which exhibited an unusually high surface nitrogen content(23.19-39.92 at.%)and the highest pyridinic-N,pyrrolic-N,and graphitic-N contents reported to *** CN-PI_(1)anode delivers an unprecedented and continuously increasing ultrahigh discharging capacity of exceeding 8400 mAh g^(-1)(1.96 mWh cm^(-2))at 100 mA g^(-1)with high specific energy density(E_(sp))of~7700 Wh kg^(-1)and the volumetric energy density(E_(v))of~14956 Wh L-1 and an excellent long-term stability(414 mAh g^(-1)or 0.579 mWh cm^(-2)at 1 A g^(-1)).Furthermore,the activation of the CN-PI_(x)electrodes contributes to their superior electrochemical performance,resulting from the fact that the Li+is not only stored in the CN-PI_(x)composites but also CN-PI_(x)activated the Li^(0)adlayer on the CN-PI_(1)-Cu heterojunction as an SEI layer to avoid the direct contact of Li^(0)phase and the *** CN-PI_(1)full cell with LiCoO_(2)as the cathode delivers a discharge capacity of~587 mAh g^(-1)at a 1 A g^(-1)after 250 cycles with a Coulombic efficiency nearly 99%.This study provides a strategy to develop N-doped g-C_(3)N_(4)-based anode materials for realizing long-lasting energy storage devices.

关键词： graphitic carbon nitride lithium-ion batteries organic electrode perylene polyimide semiconductor-metal heterojunction

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Horizontal distribution of Changjiang Diluted Water in summer inferred from total suspended sediment in the Yellow Sea and East China Sea

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Acta Oceanologica Sinica 2015年第12期34卷 44-50页

作者： LEE dong-Kyu KWON Jae-Il son Seung Hyun Pusan National University Coastal Disaster Research Center Korea Institute of Ocean Science and Technology China-Korea Joint Ocean Research Center Cooperative Institute for Research in the Atmosphere Colorado State University

During the summer in the Yellow Sea and East China Sea, the resuspension of the bottom sediment is obstructed by strong stratification and, as a result, the concentration of total suspended sediment（TSS） can be used as an excellent tracer for Changjiang Diluted Water（CDW）. To analyze the spatial and temporal variations of the CDW distribution, the monthly mean TSS from Moderate Resolution Imaging Spectroradiometer（MODIS） ocean color data are constructed and are converted to salinity using the relationship between salinity observed from AQUARIUS and TSS. The process produces the detailed horizontal distribution of salinity with very high resolution（1 km）. From monthly mean salinity map from 2002 to 2012 in July and August, the expansion patterns of CDW are analyzed. The southerly wind in July and southeasterly wind in August transport the CDW eastward and northeastward, respectively. It is found that the yearly variation of the expansion of CDW toward the southern sea area of Korea is mostly due to the variation of southerly wind and the fluctuations of fresh water discharge into the Changjiang estuary show relatively little impact on the eastward extend of CDW. When 11-year mean（from2002 to 2012） salinity map in August is compared with World Ocean Atlas 2013, it is revealed that wind in August strengthened six times from 1994 and it causes the expansion of CDW extended 150 km further eastward.

关键词： Yellow and East China Seas Changjiang diluted water total suspended sediment MODIS

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Acute amnesia during pregnancy due to bilateral fornix infarction: A case report

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World Journal of Clinical Cases 2020年第19期8卷 4494-4498页

作者： Min Jai Cho dong-ick Shin Moon-Ku Han Kyu Sun Yum Department of Neurosurgery Chungbuk National University HospitalCheongju-si 28644South Korea Department of Neurology Chungbuk National University HospitalCheongju-si 28644South Korea Department of Neurology Seoul National University Bundang HospitalSeongnam-si 463-707South Korea

BACKGROUND Stroke is an important cause of maternal morbidity and mortality during pregnancy and *** amnesia is a rare clinical symptom caused by ischemic stroke during *** present the first documented case of acute amnesia during pregnancy due to bilateral fornix *** SUMMARY A 32-year-old nullipara presented at 35 wk of gestation with acute amnesia and *** magnetic resonance imaging and angiography revealed acute infarction in the bilateral anterior *** was no evidence of causative abnormality after extensive work-up,including for vascular abnormality,cardiac disease,coagulopathy,and pregnancy-related *** patient was diagnosed with cryptogenic *** was administered immediately,and the patient recovered fully without *** Acute isolated amnesia due to stroke is rare during *** diagnosis of stroke and immediate treatment prevent neurologic sequelae.

关键词： Fornix Brain Amnesia Cerebral infarction Pregnancy Stroke Case report

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Optimization of thermoelectric properties of n-type Bi_2(Te,Se)_3 with optimizing ball milling time

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Rare Metals 2018年第4期37卷 351-359页

作者： Ji-Hee son Min-Wook Oh Bong-Seo Kim Su-dong Park Thermoelectric Conversion Research Center Korea Electrotechnology Research Institute Department of Materials Science and Engineering Hanbat National University

The thermoelectric properties at elevated temperature were investigated for n-type Bi2（Te,Se）3 which is obtained from ball milling processed powder with various milling times. Electrical properties such as electrical resistivity and Seebeck coefficient are clearly dependent on milling time, in which the carrier concentration is attributed to the change of the electrical properties. The concentrations of the defects are also varied with the ball milling time, which is the origin of the carrier concentration variation. Even though finer grain sizes are obtained after the long ball milling time, the temperature dependence of the thermal conductivity is not solely understood with the grain size, whereas the electrical contribution to the thermal conductivity should be also considered. The highest figure of merit value of ZT = 0.83 is achieved at 373 K for the optimized samples, in which ball milling time is 10 h. The obtained ZT value is 48% improvement over that of the 0.5-h sample at 373 K.

关键词： Thermoelectric properties Ball milling Bi2Te3 Seebeck coefficient Grain size Thermalconductivity

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CNN Accelerator Using Proposed Diagonal Cyclic Array for Minimizing Memory Accesses

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Computers, Materials & Continua 2023年第8期76卷 1665-1687页

作者： Hyun-Wook son Ali AAl-Hamid Yong-Seok Na dong-Yeong Lee Hyung-Won Kim Department of Electronics College of Electrical and Computer EngineeringChungbuk National UniversityCheongju28644Korea Department of Electrical Engineering College of EngineeringAl-Azhar UniversityCairo11651Egypt

This paper presents the architecture of a Convolution Neural Network(CNN)accelerator based on a newprocessing element(PE)array called a diagonal cyclic array(DCA).As demonstrated,it can significantly reduce the burden of repeated memory accesses for feature data and weight parameters of the CNN models,which maximizes the data reuse rate and improve the computation ***,an integrated computation architecture has been implemented for the activation function,max-pooling,and activation function after convolution calculation,reducing the hardware *** evaluate the effectiveness of the proposed architecture,a CNN accelerator has been implemented for You Only Look Once version 2(YOLOv2)-Tiny consisting of 9 ***,the methodology to optimize the local buffer size with little sacrifice of inference speed is presented in this *** implemented the proposed CNN accelerator using a Xilinx Zynq ZCU102 Ultrascale+Field Programmable Gate Array(FPGA)and ISE Design *** FPGA implementation uses 34,336 Look Up Tables(LUTs),576 Digital Signal Processing(DSP)blocks,and an on-chip memory of only 58 KB,and it could achieve accuracies of 57.92% and 56.42% mean Average Precession@0.5 thresholds for intersection over union(mAP@0.5)using quantized 16-bit and 8-bit full integer data manipulation with only 0.68% as a loss for 8-bit version and computation time of 137.9 and 69 ms for each input image respectively using a clock speed of 200 *** speeds are expected to be doubled five times using a clock speed of 1GHz if implemented in a silicon System on Chip(SoC)using a sub-micron process.

关键词： CNN accelerator systolic array memory optimization YOLOv2-tiny mAP@0.5

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Inhibitory activity of gold and silica nanospheres to vascular endothelial growth factor （VEGF）-mediated angiogenesis is determined by their sizes

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Nano Research 2014年第6期7卷 844-852页

作者： dong Hyun Jo Jin Hyoung Kim Jin Gyeong son Yuanze Piao Tae Geol Lee Jeong Hun Kim Fight against Angiogenesis-Related Blindness (FARB) Laboratory Clinical Research Institute Seoul National University Seoul 110-744 Republic of Korea Department of Biomedical Sciences College of Medicine Seoul National University Seoul 110-799 Republic of Korea Center for Nano-Bio Convergence World Class Laboratory Korea Research Institute of Standards and Science Daejeon 305-340 Republic of Korea Department of Chemistry and KI for the NanoCentury KAIST Daejeon 305-701 Republic of Korea Graduate School of Convergence Science and Technology Seoul National University Seoul 151-742 & Advanced Institutes of Convergence Technology Suwon 443-270 Republic of Korea Department of Ophthalmology College of Medicine Seoul National University Seoul 110-744 Republic of Korea

Nanoparticles can be involved in biological activities such as apoptosis, angiogenesis, and oxidative stress by themselves. In particular, inorganic nanoparticles such as gold and silica nanoparticles are known to inhibit vascular endothelial growth factor （VEGF）-mediated pathological angiogenesis. In this study, we show that anti-angiogenic effect of inorganic nanospheres is determined by their sizes. We demonstrate that 20 nm size gold and silica nanospheres suppress VEGF-induced activation of VEGF receptor-2, in vitro angiogenesis, and in vivo pathological angiogenesis more efficiently than their 100 nm size counterparts. Our results suggest that modulation of the size of gold and silica nanospheres determines their inhibitory activity to VEGF-mediated angiogenesis.

关键词： nanospheres anti-angiogenesis effects inorganic nanoparticles vascular endothelialgrowth factor pathological angiogenesis

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Hydrodynamics of air-kerosene bubble column under elevated pressure in homogeneous flow regime

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Chinese Journal of Chemical Engineering 2021年第5期34卷 190-202页

作者： Bay Van Tran son Ich Ngo Young-Il Lim Keon Bae dong Hyun Lee Kang-Seok Go Nam-Sun Nho Center of Sustainable Process Engineering(CoSPE) Department of Chemical EngineeringHankyong National UniversityGyeonggi-doAnseong-siJungang-ro 32717579Republicof Korea School of Chemical Engineering Sungkyunkwan University2066 Seobu-roJanganSuwon 16419Republic of Korea Center for Convergent Chemical Process(CCP) 141 Gajeong-roYuseong-guDaejeon 34114Republic of Korea

A multiphase computational fluid dynamics(CFD)model coupled with the population balance equation(PBE)was developed in a homogeneous air-kerosene bubble column under elevated pressure(P).The specific pressure drop(ΔP/L),gas holdup(α_(G)),and Sauter mean diameter(d_(32))were experimentally measured in the bubble column with 1.8 m height and 0.1 m inner diameter,which was operated at a superficial gas velocity of 12.3 mm·s^(-1),and P=1-35 bar(1 bar=10^(5) Pa).A modified drag coefficient model was proposed to consider the effect of bubble swarm and pressure on hydrodynamics of the bubble *** Luo breakage model was modified to account for liquid density,viscosity,surface tension and gas ***ΔP/L,α_(G),and d_(32) obtained from the CFD model were compared with experimental data,and the gas density-dependent parameters of the CFD model were *** increasing P from 1 to 35 bar,theα_(G) varied from 5.4%to 7.2% and the d32 decreased from 2.3 to 1.5 *** CFD-PBE model is applicable to predict hydrodynamics of pressurized bubble columns for gas-organic liquid in the homogeneous regime.

关键词： Bubble column Air-kerosene High pressure Homogenous regime Computational fluid dynamics (CFD) Population balance equation (PBE)

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