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Dual-logic-in-memory implementation with orthogonal polarization of van der Waals ferroelectric heterostructure

InfoMat 2024年第2期6卷 107-117页

作者： Jingjie Niu sumin Jeon Donggyu kim sungpyo Baek Hyun Ho Yoo Jie Li Ji-sang Park Yoonmyung Lee sungjoo Lee sKKU Advanced Institute of Nanotechnology(sAINT) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Nano science and Technology Sungkyunkwan UniversitySuwonRepublic of Korea Department of Electrical and Computer Engineering Sungkyunkwan UniversitySuwonRepublic of Korea IMEC HeverleeBelgium Department of Nano Engineering Sungkyunkwan UniversitySuwonRepublic of Korea

The rapid advancement of AI-enabled applications has resulted in an increasing need for energy-efficient computing ***-in-memory is a promising approach for processing the data stored in memory,wherein fast and efficient computations are possible owing to the parallel execution of reconfigurable logic *** this.s.udy,a dual-logic-in-memory device,which can simultaneously perform two logic operations in four states,is demonstrated using van der Waals ferroelectric field-effect trans.s.ors(vdW FeFETs).The proposed dual-logic-in-memory device,which also acts as a twobit storage device,is a single bidirectional polarization-integrated ferroelectric field-effect trans.s.or(BPI-FeFET).It is fabricated by integrating an in-plane vdW ferroelectric semiconductor s.s.and an out-of-plane vdW ferroelectric gate dielectric material—CuInP_(2)s_(6).Four reliable res.s.ance states with excellent endurance and retention characteristics were *** two-bit storage mechanism in a BPI-FeFET was analyzed from two perspectives:carrier density and carrier injection controls,which originated from the out-of-plane polarization of the gate dielectric and in-plane polarization of the semiconductor,*** conventional multilevel FeFETs,the proposed BPIFeFET does not require additional pre-examination or erasing steps to switch from/to an intermediate polarization,enabling direct switching between the four memory *** utilize the fabricated BPI-FeFET as a dual-logic-inmemory device,two logical operations were selected(XOR and AND),and their parallel execution was *** types of logic operations could be implemented by selecting different initial states,demonstrating various types of functions required for numerous neural network *** flexibility and efficiency of the proposed dual-logic-in-memory device appear promising in the realization of next-generation low-power computing s.s.ems.

关键词： ferroelectric field-effect trans.s.or in-plane ferroelectricity logic-in-memory out-of-plane ferroelectricity

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Biomimetic Fe_(7)s_(8)/Carbon electrocatalyst from[FeFe]-Hydrogenase for improving pH-Universal electrocatalytic hydrogen production special Collection:Aggregation-Induced Process.s.and Functions

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Aggregate 2024年第1期5卷 451-459页

作者： Dohun kim subramani surendran sejin Im Jaehyoung Lim Kyoungsuk Jin Ki Tae Nam Uk sim Department of Energy science&Engineering Daegu Gyeongbuk Institute of Science&Technology(DGIST)DaeguRepublic of Korea Hydrogen Energy Technology Laboratory Korea Institute of Energy Technology(KENTECH)NajuRepublic of Korea Department of Chemistry Korea UniversitySeoulRepublic of Korea Department of Materials.s.ience and Engineering Seoul National UniversitySeoulRepublic of Korea

Efficient and cost-effective electrocatalys.s.that can operate across a wide range of pH conditions are essential for green hydrogen *** by biological s.s.ems,Fe_(7)s_(8)nanoparticles incorporated on polydopamine matrix electrocatalyst were synthesized by co-precipitation and annealing *** resulting Fe_(7)s_(8)/C electrocatalyst poss.s.es a three-dimensional structure and exhibits enhanced electrocatalytic performance for hydrogen production across various pH ***,the Fe_(7)s_(8)/C electrocatalyst demonstrates exceptional activity,achieving low overpotentials of 90.6,45.9,and 107.4 mV in acidic,neutral,and alkaline environments,*** impedance spectroscopy reveals that Fe_(7)s_(8)/C exhibits the lowest charge transfer res.s.ance under neutral conditions,indicating an improved proton-coupled electron transfer ***-wave electron paramagnetic resonance results confirm a change in the valence state of Fe from 3+to 1+during the hydrogen evolution reaction(HER).These findings closely resemble the behavior of natural[FeFe]-hydrogenase,known for its.s.perior hydrogen production in neutral *** remarkable performance of our Fe_(7)s_(8)/C electrocatalyst opens up new possibilities for utilizing bioinspired materials as catalys.s.for the HER.

关键词： biomimetic electrocatalyst hydrogen production renewable energy

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Effectiveness of sensory integration therapy in children,focusing on Korean children:A s.s.ematic review and meta-analysis

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World Journal of Clinical Cases 2024年第7期12卷 1260-1271页

作者： seri Oh Jong-sik Jang A-Ra Jeon Geonwoo kim Mihwa Kwon Bahoe Cho Narae Lee Department of Occupational Therapy Kangwon National University Graduate SchoolSamcheok 25949South Korea Department of Occupational Therapy Kangwon National UniversitySamcheok 25949South Korea Department of Occupational Therapy Ju-Ju Children Development CenterNonsansi 32985Chungcheongnam-doSouth Korea Department of Occupation Therapy Suwon Women’s UniversityGyeonggi-do 16632South Korea Hijam Center for Development of Children Ochang 28117South Korea Department of Occupational Therapy U1 UniversityChung-cheong bukdo 25949South Korea

BACKGROUND sensory integration intervention is highly related to the child's effective interaction with the environment and the child's ***,various.s.nsory integration interventions are being applied,but research methodological problems are arising due to uns.s.ematic *** study aims to present the optimal intervention protocol by presenting scientific standards for sensory integration intervention through *** To prove the effectiveness of sensory integration therapy,examine the latest trend of sensory integration studies in Korea,and provide clinical evidence for sensory integration *** The database of Korean search engines,including RIss,KIss,and DBpia,was used to search for related literature published from 2001 to October *** keywords,“Children”,“sensory integration”,“Integrated sensory”,“sensorymotor”,and“sensory stimulation”were used in this ***,a meta-analys.s.was conducted on 24 selected studiesRIss,KIss,and DBpia,was used to search for related literature published from 2001 to October *** keywords,“Children”,“sensory integration”,“Integrated sensory”,“sensorymotor”,and“sensory stimulation”were used in this ***,a meta-analys.s.was conducted on 24 selected *** sensory integration intervention has been proven effective in children with cerebral palsy,autism spectrum disorder,attention deficit/hyperactivity disorder,developmental disorder,and intellectual disability in relation to the diagnos.s.of *** sensory integration therapies,1:1 individual treatment with a therapist or a therapy s.s.ion lasting for 40 min was most *** terms of dependent variables.s.nsory integration therapy effectively promoted social skills,adaptive behavior,sensory processing,and gross motor and fine motor *** The results of this.s.udy may be used as therapeutic evidence for sensory integration intervention in the clinical field of occupational therapy for

关键词： Children Meta-analysis Occupational therapy sensory integration sensory processing social skills

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Azimuthal rotation-controlled nanoinscribing for continuous patterning of period-and shapetunable asymmetric nanogratings

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Micros.s.ems & Nanoengineering 2024年第3期10卷 207-218页

作者： Useung Lee Hyein kim Dong Kyo Oh Nayeong Lee Jonggab Park Jaewon Park Hyunji son Hyunchan Noh Junsuk Rho Jong G.Ok Department of Mechanical and Automotive Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POsCO-POsTECH-RIsT Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea Present address:Department of Mechanical Engineering Korea University145 Anam-roSeongbuk-guSeoul 02841Republic of Korea Research Team Hyundai Motor Group150 Hyundaiyeonguso-roHwaseong-siGyeonggi 18280Republic of Korea

We present an azimuthal-rotation-controlled dynamic nanoinscribing(ARC-DNI)process for continuous and scalable fabrication of asymmetric nanograting structures with tunable periods and shape profiles.A sliced edge of a nanograting mold,which typically has a rectangular grating profile,slides over a polymeric substrate to induce its burrfree plastic deformation into a linear *** this continuous nanoinscribing process,the“azimuthal angle,”that is,the angle between the moving direction of the polymeric substrate and the mold’s grating line orientation,can be controlled to tailor the period,geometrical shape,and profile of the inscribed *** modulating the azimuthal angle,along with other important ARC-DNI parameters.s.ch as temperature,force,and inscribing speed,we demonstrate that the mold-opening profile and temperature-and time-dependent viscoelastic polymer reflow can be controlled to fabricate asymmetric,blazed,and slanted nanogratings that have diverse geometrical profiles.s.ch as trapezoidal,triangular,and ***,period-and profile-tunable ARC-DNI can be utilized for the practical fabrication of diverse optical devices,as is exemplified by asymmetric diffractive optical elements in this.s.udy.

关键词： tunable asymmetric rotation

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Machine learning-guided accelerated discovery of structure-property correlations in lean magnesium alloys for biomedical applications

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Journal of Magnesium and Alloys 2024年第6期12卷 2267-2283页

作者： sreenivas Raguraman Maitreyee sharma Priyadarshini Tram Nguyen Ryan McGovern Andrew kim Adam J.Griebel Paulette Clancy Timothy P.Weihs Department of Materials.s.ience and Engineering Johns Hopkins University3400 N Charles StBaltimore21218MDU.S.A Hopkins Extreme Materials Institute Johns Hopkins University3400 N Charles StBaltimore21218MDU.S.A Department of Chemical and Biomolecular Engineering Johns Hopkins University3400 N Charles StBaltimore21218MDU.S.A Translational Tissue Engineering Center Johns Hopkins School of Medicine400 N BroadwayBaltimore21231MDU.S.A Department of Biomedical Engineering Johns Hopkins University3400 N Charles StBaltimore21218MDU.S.A Research and Development Fort Wayne Metals Research ProductsLLC9609 Ardmore AveFort Wayne46809INU.S.A Department of Mechanical Engineering Johns Hopkins University3400 N Charles StBaltimore21218MDU.S.A

Magnesium alloys are emerging as promising alternatives to traditional orthopedic implant materials thanks to their biodegradability,biocompatibility,and impressive mechanical ***,their rapid in-vivo degradation presents challenges,notably in upholding mechanical integrity over *** study investigates the impact of high-temperature thermal processing on the mechanical and degradation attributes of a lean Mg-Zn-Ca-Mn alloy,*** rapid,cost-efficient characterization methods like X-ray diffraction and optical microscopy,we swiftly examine microstructural changes post-thermal *** Pearson correlation coefficient analys.s.we unveil the relationship between microstructural properties and critical targets(properties):hardness and corrosion ***,leveraging the least absolute shrinkage and selection operator(LAssO),we pinpoint the dominant microstructural factors among closely correlated *** findings underscore the significant role of grain size refinement in strengthening and the predominance of the ternary Ca_(2)Mg_(6)Zn_(3)phase in corrosion *** sugges.s.that achieving an optimal blend of strength and corrosion res.s.ance is attainable through fine grains and reduced concentration of ternary *** thorough investigation furnishes valuable insights into the intricate interplay of processing,structure,and properties in magnesium alloys,thereby advancing the development of superior biodegradable implant materials.

关键词： Magnesium alloys Machine learning Corrosion Mechanical properties Rapid characterization

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Implementation of an international medical student pen-pal club:survey outcomes of perceptions in cultural competency and global health

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Global Health Journal 2024年第1期8卷 11-15页

作者： Max J.Goodman Jennifer Livschitz Ji Won kim Megan L.schultz Medical College of Wisconsin MilwaukeeWI 53226USA Department of Pediatrics Division of Emergency MedicineMedical College of WisconsinMilwaukeeWI53226USA

Background:Pen-pal clubs(PPC)are used worldwide for students to learn about different cultures and other skillsets without the need for *** medical students are interested in global health opportunities abroad but cos.s.scheduling,and other barriers allow few to participate in such *** is important that medical students have nuanced global medical perspectives and can contribute to the global medical ***:The purpose of this.s.udy is to demonstrate that an international medical student PPC improves medical students'perspectives of cultural competency and global health ***:In 2021,a novel medical student PPC was established that began between an American and Japanese medical *** a shareholders meeting,it was decided that the number of medical schools involved globally be expanded through previous institutional affiliations and online *** total,the club connected 50 American medical students and 52 medical students from 17 high-and middle-income *** primary form of communication was online;pen-pals were encouraged to communicate monthly using provided topics,although frequency and way of communication was their *** February 2022,American PPC members were emailed a qualitative survey to ass.s. the PPC's ***:The survey was completed by 42%of American PPC members,95%of which were 22-26 *** were preclinical medical students,60%whom were female and the majority either white(47%)or Asian(43%).Overall,the PPC positively influenced American medical students'perception of global medicine,medical education,and their cultural competency after joining the PPC compared to prior(P=0.004).Conclusion:PPCs encourage medical students to think from a global perspective and foster open-mindedness within varying social and cultural *** a global communication platform for students during medical school education may be an additional way to train aspiring global l

关键词： Pen-pals Medical student Global health Cultural competency

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strip Casting of High Performance structural Alloys

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Journal of Rare Earths 2004年第Z2期22卷 78-84页

作者： s.s.Park J G Lee Nack J kim Center for Advanced Aerospace Materials Pohang University of Science and TechnologyPohang 790-784Korea Center for Advanced Aerospace MaterialsPohang University of Science and TechnologyPohang 790-784Korea Center for Advanced Aerospace MaterialsPohang University of Science and TechnologyPohang 790-784Korea

There exis.s.a great need for the development of high performance alloys due to increasing demands for energy conservation and environmental protection. Application of strip casting shows a strong potential for the improvement of properties of existing alloys and also for the development of novel alloy s.s.ems with superior properties. The present paper reviews our Center's activities in the development of high performance alloys by strip casting. Examples include (1) Al alloys, (2) wrought Mg alloys, and (3) bulk metallic glass (BMG) alloys.

关键词： strip casting 6061 Al alloy AZ Mg alloy bulk metallic glass (BMG) alloy dispersion hardening

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Magnetic force improvement and parameter optimization for magnetic abrasive polishing of AZ31 magnesium alloy

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中国有色金属学会会刊：英文版 2008年第A1期18卷 369-373页

作者： s.O.kim J.s.KWAK Graduate school of Mechanical Engineering Pukyong National UniversitySouth Korea school of Mechanical Engineering Pukyong National UniversitySouth Korea

The magnetic force acting on workpiece to be machined plays a significantly important role in magnetic abrasive polishing *** in a case of polishing nonferrous materials,the strength of magnetic force is very low and it leads lower polishing *** magnesium alloy that has.s.perior mechanical properties for industrial application such as a lightweight and high specific strength is one of the most famous nonferrous *** improving strategy of the magnetic force for the AZ31 magnesium alloy installed with a permanent magnet was proposed and experimental verification was carried *** the proposed strategy,the effect of process parameters on the surface roughness of the AZ31 magnesium alloy was evaluated by a design of experimental method.

关键词：镁合金物理性能磁力最优化设计磁性

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Anomalously strong scattering of spontaneously Produced Laser Radiation in the First Free-Electron Laser and study of Free-Electron Two-Quantum stark Lasing in an Electric Wiggler with Quantum-Wiggler Electrodynamics

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Chinese Physics Letters 2006年第6期23卷 1422-1425页

作者： s. H. kim Department of Physics University of Texas at Arlington PO Box 19059 Arlington Texas 76019 USA

We calculate the scattering cross.s.ction of an electron with respect to the spontaneously produced laser radiation in the first free-electron laser （FEL） with quantum-wiggler electrodynamics （QWD）. The cross.s.ction is 1016 times the Thomson cross.s.ction, confirming the result obtained by a previous analys.s.of the experimental data. A QWD calculation show that spontaneous emission in an FEL using only an electric wiggler can be very strong while amplification through net stimulated emission is practically negligible.

关键词： CLAssICAL ELECTRODYNAMICs RELATIVIsTIC ELECTRONs THERMODYNAMICs EXPLANATION EMIssION

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Biofabrication of nanocomposite-based scaffolds containing human bone extracellularmatrix for the differentiation of skeletal stem and progenitor cells

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Bio-Design and Manufacturing 2024年第2期7卷 121-136页

作者： Yang-Hee kim Janos M.Kanczler stuart Lanham Andrew Rawlings Marta Roldo Gianluca Tozzi Jonathan I.Dawson Gianluca Cidonio Richard O.C.Oreffo Faculty of Medicine Bone and Joint Research GroupCentre for Human DevelopmentStem Cells and RegenerationInstitute of Developmental SciencesUniversity of SouthamptonSouthampton SO166YDUK school of Pharmacy and Biomedical science University of PortsmouthPortsmouth PO12DTUK school of Engineering Faculty of Engineering and ScienceUniversity of GreenwichGreenwich ME44TBUK Center for Life Nano-and Neuro-science(CLN2s) Italian Institute of Technology00161 RomeItaly

Autograft or metal implants are routinely used in skeletal ***,they fail to provide long-term clinical resolution,necessitating a functional biomimetic tissue engineering *** use of native human bone tissue for synthesizing a biomimeticmaterial inkfor three-dimensional(3D)bioprintingof skeletal tissueis anattractivestrategyfor ***,human bone extracellular matrix(bone-ECM)offers an exciting potential for the development of an appropriate microenvironment for human bone marrow stromal cells(HBMs.s.to proliferate and differentiate along the osteogenic *** this.s.udy,we engineered a novel material ink(LAB)by blending human bone-ECM(B)with nanoclay(L,Laponite®)and alginate(A)polymers using extrusion-based *** inclusion of the nanoﬁller and polymeric material increased the rheology,printability,and drug retention properties and,critically,the preservation of HBMs.s.viability upon *** composite of human bone-ECM-based 3D constructs containing vascular endothelial growth factor(VEGF)enhanced vascularization after implantation in an ex vivo chick chorioallantoic membrane(CAM)*** inclusion of bone morphogenetic protein-2(BMP-2)with the HBMs.s.further enhanced vascularization and mineralization after only seven *** study demonstrates the synergistic combination of nanoclay with biomimetic materials(alginate and bone-ECM)to support the formation of osteogenic tissue both in vitro and ex vivo and offers a promising novel 3D bioprinting approach to personalized skeletal tissue repair.

关键词： Extracellular matrix Nanoclay Bone 3D bioprinting

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