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Microsystems & Nanoengineering 2020年第1期6卷 243-254页

作者： Hyun-Joon kim-Lee Seog Woo Hong Dong Kyun kim Jinmyoung kim Hong Suk kim Seok-Whan Chung Eun-Hyoung Cho hae-sung kim Byung-Kyu Lee Device Research Center Samsung Advanced Institute of Technology130 Samsung-roYeongtong-guSuwon-siGyeonggi-do 443-803Republic of Korea

In this study,a mutual capacitive-type on-screen fingerprint sensor,which can recognize fingerprints on a display screen to provide smartphones with full-screen displays with a minimal bezel area,is ***-screen fingerprint sensors are fabricated using an indium tin oxide transparent conductor with a sheet resistance of~10Ω/*** a transmittance of~94%(~86% with the substrate effect)in the visible wavelength range,and assembled onto a display *** at this high transmittance,the electrodes can degrade the display quality when they are placed on the *** interference between periodic display pixel arrays and sensor patterns can lead to the *** is necessary to find an appropriate sensor pattern that minimizes the Moirepattern,while maintaining the signal *** search for appropriate patterns,a numerical calculation is carried out over wide ranges of pitches and rotation *** range is narrowed for an experimental evaluation,which is used to finally determine the sensor *** the selected sensor pitches are too small to detect capacitance variations,three unit patterns are electrically connected to obtain a unit block generating a larger *** applying the selected sensor pattern and circuit driving by block,fingerprint sensing on a display is demonstrated with a prototype built on a commercial smartphone.

关键词： transparent pattern smart

Supramolecular Polymer Intertwined Free-Standing Bifunctional Membrane Catalysts for All-Temperature Flexible Zn-Air Batteries

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Nano-Micro Letters 2022年第11期14卷 341-360页

作者： Nayantara K.Wagh Sambhaji S.Shinde Chi Ho Lee sung-hae kim Dong-Hyung kim Han-Don Um Sang Uck Lee Jung-Ho Lee Department of Materials Science and Chemical Engineering Hanyang UniversityAnsanRepublic of Korea Department of Applied Chemistry Center for Bionano Intelligence Education and ResearchHanyang UniversityAnsanRepublic of Korea Department of Chemical Engineering Kangwon National UniversityChuncheonGangwon 24341Republic of Korea

Rational construction of flexible free-standing electrocatalysts featuring long-lasting durability,high efficiency,and wide temperature tolerance under harsh practical operations are fundamentally significant for commercial zinc-air ***,3D flexible free-standing bifunctional membrane electrocatalysts composed of covalently cross-linked supramolecular polymer networks with nitrogen-deficient carbon nitride nanotubes are fabricated(referred to as PEMAC@NDCN)by a facile self-templated ***@NDCN demonstrates the lowest reversible oxygen bifunctional activity of 0.61 V with exceptional long-lasting durability,which outperforms those of commercial Pt/C and RuO_(2).Theoretical calculations and control experi-ments reveal the boosted electron transfer,electrolyte mass/ion transports,and abundant active surface site ***,the constructed alkaline Zn-air battery with PEMAC@NDCN air-cathode reveals superb power density,capacity,and discharge-charge cycling stability(over 2160 cycles)compared to the reference Pt/C+RuO_(2).Solid-state Zn-air batteries enable a high power density of 211 mW cm^(−2),energy density of 1056 Wh kg^(−1),stable charge-discharge cycling of 2580 cycles for 50 mA cm^(−2),and wide temperature tolerance from−40 to 70℃with retention of 86%capacity compared to room-temperature counterparts,illustrating prospects over harsh operations.

关键词： Flexible free-standing membrane electrocatalysts Supramolecular polymer Alkaline and flexible solid-state Zn-air batteries All-temperature operations High capacity and energy density

Effect of W/C ratio and cover thickness on polarization characteristics of embedded steel in mortar

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中国有色金属学会会刊：英文版 2009年第4期19卷 909-912页

作者： Kyung-Man MOON sung-Yul LEE Myung-Hoon LEE Yun-hae kim Department of Mechanical and Material Engineering Korea Maritime University Department of Marine System Engineering Korea Maritime University

The effects of cover thickness and W/C(water-to-cement) ratio on polarization properties of embedded steel bar were investigated with electrochemical *** potentials shift to the noble direction with increasing the cover *** addition,when the cover thickness increasingly becomes thinner and thinner,effect of the W/C ratio on variation of corrosion potential increases as *** value at 100 kHz indicating the resistance of cover thickness increases with the decrement of W/C ratio as well as the increment of cover ***,in the case of W/C ratio at 0.6,impedance at 10 mHz shows the relatively larger value than that at W/C ratio of 0.4 or 0.5 in the range of cover thickness from 4 to 8 cm,which is probably expected that oxide film built up on the surface of steel bar due to strong alkali environment by hydration reaction with increasing W/C ratio is performed as the resistance *** is also observed that liquid junction potential tends to increase with decreasing W/C ratio.

关键词：保护层厚度嵌入式偏振特性钢筋砂浆覆盖厚度极化性能电化学方法

Noninvasive Parameters and hepatic fibrosis scores in children with nonalcoholic fatty liver disease

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World Journal of Gastroenterology 2012年第13期18卷 1525-1530页

作者： Hye Ran Yang hae Ryoung kim Myung Jin kim Jae sung Ko Jeong Kee Seo Department of Pediatrics Seoul National University College of MedicineSeoul 110-744South Korea Department of Pediatrics Seoul National University Bundang HospitalSeongnam-siGyonggi-do 463-707South Korea Department of Pathology Seoul National University Bundang HospitalSeongnam-siGyonggi-do 464-894 South Korea

AIM:To evaluate the noninvasive parameters and hepatic fibrosis scores in obese children with nonalcoholic fatty liver disease(NAFLD).METHODS:A total of 77 children diagnosed with NAFLD via liver biopsy were included and divided into 2 subgroups according to the histopathologic staging of hepatic fibrosis:mild(stage 0-1)vs significant fibrosis(stage 2-4).Clinical and laboratory parameters were evaluated in each *** aspartate aminotransferase(AST)/alanine aminotransferase(ALT)ratio,AST/platelet ratio index(APRI),PGA index,Forns index,FIB-4,NAFLD fibrosis score,and pediatric NAFLD fibrosis index(PNFI)were ***:No clinical or biochemical parameter exhibited a significant difference between patients with mild and significant *** noninvasive hepatic fibrosis scores,only APRI and FIB4 revealed a significant difference between patients with mild and significant fibrosis(APRI:0.67±0.54 vs 0.78±0.38,P=0.032 and FIB4:0.24±0.12 vs 0.31±0.21,P=0.010).The area under the receiving operating characteristic curve of FIB4 was 0.81,followed by Forns index(0.73),APRI(0.70),NAFLD fibrosis score(0.58),AST/ALT ratio(0.53),PGA score(0.45),and PNFI(0.41).CONCLUSION:APRI and FIB4 might be useful noninvasive hepatic fibrosis scores for predicting hepatic fibrosis in children with NAFLD.

关键词： Fatty liver Hepatic fibrosis Noninvasive Obesity Child

Understanding microstructure and mechanical properties of(AlTa(0.76))xCoCrFeNi(2.1) eutectic high entropy alloys via thermo-physical parameters

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Journal of Materials Science & Technology 2020年第22期54卷 131-137页

作者： Min Jung kim Gyeol Chan Kang sung Hwan Hong hae Jin Park Sang Chul Muna Gian Song Ki Buem kim Department of Nanotechnology and Advanced Materials Engineering Sejong University209 Neungdong-roCwangjin-guSeoul143-747South Korea Division of Advanced Materials Engineering Kongju National UniversityCheonanChungnam330-717South Korea

(AlTa(0.76))xCoCrFeNi(2.1)(x values in molar ratio,x=0.1,0.3,0.5,0.7,1.0,and 1.5) alloys were designed to investigate the microstructure and mechanical properties of the eutectic high entropy alloys(EHEAs)consisting of FCC,B2,and Laves *** on the compositional variatio,clear microstructural variation was observed,as follows:(1) Group 1:FCC dendrite+Laves interdendrite(x=0.1),(2) Group 2:FCC dendrite+fine-eutectic structure consisting of FCC and Laves phases(x=0.3,0.5 and 0.7),(3) Group 3:B2 dendrite+bimodal eutectic structure [FCC/B2+Laves](x=1.0),(4) Group 4:Laves dendrite+eutectic structure consisting of B2 and Laves phases(x=1.5).As the fraction of Laves or B2 phases increases,yield stress increases from 293 to 2336 MPa,while the plastic strain decreases from 50 % to 2%.Thermo-physical parameters,such as mixing entropy(△S(mix)),mixing enthalpy(△H(mix)),valence electron concentration(VEC),and atomic size difference(δr),were calculated to understand the microstructural *** criteria(δr-VEC and δr-△H(mix)) were utilized to elucidate the formation of the eutectic structures in the present EHEAs,revealing the usefulness of the thermo-physical parameters in the development of EHEAs.

关键词： High-entropy alloy Eutectic high-entropy alloy Microstructure Mechanical properties Thermo-physical parameter

Formation of photo-reactive heterostructure from a multicomponent amorphous alloy with atomically random distribution

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Journal of Materials Science & Technology 2022年第14期109卷 245-253页

作者： hae Jin Park Hee Jin Lee Tae Kyung kim sung Hwan Hong Wei-Min Wang Taek Jib Choi Ki Buem kim Department of Nanotechnology and Advanced Materials Engineering Sejong University209 Neung dong-roGwangjin-guSeoul 05006Republic of Korea Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

In this study,metallic glass is designed tunable for promising functional applications via a facile and stable,one-step *** approach about alloy design and process is based on the unique properties of the Ti-Cu-Ni-Sn metallic glass that are afforded by the varying oxygen affinities of the four constituent *** metallic glass exhibits homogeneous nucleation of oxides and uniform formation of the various metal *** alloy design and hydrothermal synthesis to customize the metallic glasses are the most critical factors that determine the characteristics of the metal oxides and the resulting nanostructures and photoelectrode *** enables the desired element to be selectively grown via a facile single-step *** results provide a promising road map for the application of metallic glasses to photoelectrochemical(PEC)solar water splitting,as well as various other new possibilities.

关键词： Metallic glass Alloy design Hydrothermal synthesis Metal oxide Water splitting

Electrodeposited copper oxides with a suppressed interfacial amorphous phase using mixed-crystalline ITO and their enhanced photoelectrochemical performances

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Journal of Energy Chemistry 2023年第7期82卷 277-286,I0007页

作者： Ji Hoon Choi hae-Jun Seok Dongchul sung Dong Su kim Hak Hyeon Lee Suklyun Hong Han-Ki kim Hyung Koun Cho School of Advanced Materials Science and Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-do 16419Republic of Korea Department of Physics Graphene Research Instituteand GRI-TPC International Research CenterSejong UniversitySeoul 05006Republic of Korea

The effectiveness of photoelectrochemical(PEC)water splitting is significantly restricted by insufficient light harvesting,rapid charge recombination,and slow water reduction *** the presence of amorphous phases in the interfaces hinders the overcome of these inherent limitations,a photoelectrode must be built ***,we artificially controlled the crystallographic orientation of indium tin oxide(ITO)to determine the orientation with the smallest lattice mismatch at the Cu_(2)O interface,thus significantly reducing the amorphous phase in the early stage of electrodeposition ***[222]/[400]mixed orientation ITO primarily exposed the{400}surface planes and accelerated charge transfer by forming an optimal interface with preferentially grown(111)oriented Cu_(2)O and minimized amorphous *** addition,the ITO surface energy was calculated using density functional theory to theoretically verify which plane is more active for growing the photoactivation *** rationally designed ITO/Cu_(2)O/Al-dope Zn O/TiO_(2)/Rh-P device,with each layer serving a specific purpose,achieved a photocurrent density of 8.23 mA cm^(-2)at 0 VRHEunder AM 1.5 G illumination,providing a standard method for effective solar-to-hydrogen conversion photocathodes.

关键词： Photoelectrochemical water splitting Cu_(2)O ITO Hydrogen Surface energy DFT

CAD/CAM for scalable nanomanufacturing:A network-based system for hybrid 3D printing

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Microsystems & Nanoengineering 2017年第1期3卷 135-145页

作者： hae-sung Yoon Hyun-Taek Lee Ki-Hwan Jang Chung-Soo kim Hyunseo Park Dae-Wook kim Kunwoo Lee Sangkee Min sung-Hoon Ahn BK21 Plus Transformative Training Program for Creative Mechanical and Aerospace Engineers Seoul National UniversitySeoul 08826Republic of Korea Department of Mechanical and Aerospace Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Mechanical Engineering University of Wisconsin-MadisonMadisonWI 53706USA Institute of Advanced Machines and Design Seoul National UniversitySeoul 08826Republic of Korea

Micro-and nano-structuring have been highlighted over several decades in both science and engineering *** addition to continuous efforts in fabrication techniques,investigations in scalable nanomanufacturing have been pursued to achieve reduced feature size,fewer constraints in terms of materials and dimensional complexity,as well as improved process *** this study,based on recent micro-/nanoscale fabrication processes,characteristics and key requirements for computer-aided design and manufacturing(CAD/CAM)systems for scalable nanomanufacturing were *** include a process knowledge database,standardized processing,active communication,adaptive interpolation,a consistent coordinate system,and management of peripheral *** scalable nanomanufacturing,it is important to consider the flexibility and expandability of each process,because hybrid and bridging processes represent effective ways to expand process *** an example,we describe a novel CAD/CAM system for hybrid three-dimensional(3D)printing at the *** novel hybrid process was developed by bridging aerodynamically focused nanoparticle printing,focused ion beam milling,micromachining,and spincoating *** system developed can print a full 3D structure using various inorganic materials,with a minimum process scale of 50 *** most obvious difference versus CAD/CAM at‘conventional’scales is that our system was developed based on a network to promote communication between users and process *** the network-based system,it is also possible to narrow the gap among different processes/*** anticipate that this approach can contribute to the development of CAD/CAM for scalable nanomanufacturing and a wide range of hybrid processes.

关键词： Computer-aided design and manufacturing(CAD/CAM) nanomanufacturing network-based 3D printing

Synthesis and microstructure of zirconia nanopowders by glycothermal processing

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中国有色金属学会会刊：英文版 2009年第B9期19卷 88-91页

作者： Jun-Seop kim Dong-hae LEE sung KANG Dong-Sik BAE Hoy-Yul PARK Moon-Kyeung NA School of Nano & Advanced Material Engineering College of EngineeringChangwon National University Advanced Materials and Application Research Laboratory Korea Electro Technology Research Institute

ZrO2 nanoparticles were prepared under high temperature and high pressure conditions by precipitation from metal nitrates with aqueous potassium hydroxide. The effects of synthesis parameters, such as the concentration of starting solution, pH of starting solution, reaction temperature and time, were discussed. The results show that the ZrO2 nanoparticles are obtained at 230-270 ℃. The average size and size distribution of the synthesized particles are below 10 nm and narrow, respectively. The XRD pattern shows that the synthesized particles are composed of crystalline. The synthesis of ZrO2 nanosized crystalline particles is possible under glycothermal conditions in ethylene glycol solution.

关键词：纳米氧化锆合成粉体加工微观结构结晶颗粒溶液pH值高压条件氢氧化钾

Exploring Artistic Embeddings in Service Design:A Keyword-Driven Approach for Artwork Search and Recommendations

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Tsinghua Science and Technology 2024年第5期29卷 1580-1592页

作者： Jie Yuan Fangru Lin hae Yoon kim College of Design Dongseo UniversityBusan 47011Republic of Korea Shandong Provincial University Laboratory for Protected Horticulture College of ArtsWeifang University of Science and TechnologyWeifang 262700China

As living standards improve,the demand for artworks has been escalating,transcending beyond the realm of mere basic human ***,amidst an extensive array of artwork choices,users often struggle to swiftly and accurately identify their preferred *** such scenarios,a recommendation system can be invaluable,assisting users in promptly pinpointing the desired artworks for better service *** the escalating demand for artwork recommendation systems,current research fails to adequately meet these ***,existing artwork recommendation methodologies tend to disregard users’implicit interests,thereby overestimating their capability to articulate their preferences in full and often neglecting the nuances of their diverse *** response to these challenges,we have developed a weighted artwork correlation graph and put forth an embedding-based keyword-driven artwork search and recommendation *** approach transforms the keywords that delineate user interests into word embedding *** allows for an effective distinction between the user’s core and peripheral ***,we employ a dynamic programming algorithm to extract artworks from the correlation graph,thereby obtaining artworks that align with the user’s explicit keywords and implicit *** have conducted an array of experiments using real-world datasets to validate our *** results attest to the superiority of our method in terms of its efficacy in searching and recommending artworks.

关键词： artwork self-attention recommendation dynamic programming implicit interest