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Mechanical densification synthesis of single-crystalline Ni-rich cathode for high-energy lithium-ion batteries

Journal of Energy Chemistry 2023年第4期79卷 562-568页

作者： Gwonsik nam Jaeseong Hwang Donghun Kang Sieon Oh Sujong Chae Moonsu Yoon Minseong Ko Division of Convergence Materials Engineering Pukyong National UniversityBusan 48547Republic of Korea namyang R&D Center Hyundai Motor CompanyHwaseong 18280Republic of Korea Division of Industrial Chemistry and Polymer Engineering Pukyong National UniversityBusan 48547Republic of Korea Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

The intergranular microcracking in polycrystalline Ni-rich cathode particle is led by anisotropic volume change and stress corrosion along grain boundary,accelerating battery performance ***,we have suggested a simple but advanced solid-state method that ensures both uniform transition metal distribution and single-crystalline morphology for Ni-rich cathode synthesis without sophisticated ***-assisted mechanical densification(PAMD)process on solid-state precursor mixture enables the dynamic mass transfer through the increased solid-solid contact area which facilitates the grain growth during sintering process,readily forming micro-sized single-crystalline ***,the improved chemical reactivity by a combination of capillary effect and vacancyassisted diffusion provides homogeneous element distribution within each primary *** a result,single-crystalline Ni-rich cathode with PAMD process has eliminated a potential evolution of intergranular cracking,thus achieving superior energy retention capability of 85%over 150 cycles compared to polycrystalline Ni-rich particle even after high-pressure calendering process(corresponding to electrode density of~3.6 g cm^(-3))and high cut-off voltage *** work provides a concrete perspective on developing facile synthetic route of micron-sized single-crystalline Ni-rich cathode materials for high energy density lithium-ion batteries(LIBs).

关键词： Lithium-ion batteries Ni-rich cathode materials Mechanical densification Solid-state synthesis

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LETRNG—A Lightweight and Efficient True Random Number Generator for GNU/Linux Systems

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Tsinghua Science and Technology 2023年第2期28卷 370-385页

作者： Yucong Chen Fangfang Zhu Yanshan Tian Shuaixin Xu Lihong han Qingguo Zhou nam Ling School of Information Science and Engineering Lanzhou UniversityLanzhou 730000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Department of Computer Science and Engineering Santa Clara UniversitySanta ClaraCA 95053 USA

Unpredictable and irreproducible digital keys are required to modulate security-related information in secure communication *** random number generators(TRNGs)rather than pseudorandom number generators(PRNGs)are required for the highest level of *** is a significant component in the digital security realm for extracting unpredictable binary ***,most TRNGs extract high-quality“noise”from unpredictable physical random ***,these applications must be equipped with external hardware for collecting entropy and converting them into a random digital *** study introduces a lightweight and efficient true random number generator(LETRNG)that uses the inherent randomness of a central processing unit(CPU)and an operating system(OS)as the source of *** then utilize a lightweight post-processing method based on XOR and fair coin operation to generate an unbiased random binary *** based on two famous test suites(NIST and ENT)show that LETRNG is perfectly capable of generating high-quality random numbers suitable for various GNU/Linux systems.

关键词： GNU/Linux system true random number generator complex system inherent randomness nondeterminism

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Effects of heterofunctional alkali-metal formate doping on perovskite solar cell performance

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Journal of Materiomics 2022年第6期8卷 1165-1171页

作者： Sakshi Thakur Sung-nam Kwon Dilpreet Singh Mann Seok-In Na Department of Flexible and Printable Electronics and LANL-JBNU Engineering Institute-Korea Jeonbuk National University567Baekje-daeroDeokjin-guJeonju-si54896Republic of Korea

Various internal and external defects present in the perovskite film are one of the main factors that causelow efficiency and stability, and in order to realize high-performance perovskite solar cells, it is necessaryto develop a method to effectively suppress them. In this study, a heterofunctional dopants strategy wasattempted to integrate the effect of alkali metal cations (Rbþ and Kþ) and formate anion (HCOO) throughdoping engineering with alkali-metal formates, i.e., rubidium formate (RbHCOO) and potassium formate(KHCOO). Inclusive physical and photoelectric analysis revealed that doping with a small amount ofalkali-metal formate leads to crystal growth and reduction of grain boundaries, and further passivates orinhibits bulk and surface defects. As a result, the photogenerated charge recombination was reduced andthe charge carrier transport was improved, leading to improved PSC performance. RbHCOO-dopedinverted planar PSCs achieved a PCE of up to 20.41% with long-term stability. Our findings provide away for producing high-quality perovskite films with low defect densities that are essential for realizinghigh-performance PSCs.

关键词： Perovskite solar cells Heterofunctional dopant Alkali-metal formate Rubidium formate Potassium formate Reduction of the charge trap density

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Clinical application of repetitive transcranial magnetic stimulation in stroke rehabilitation

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Neural Regeneration Research 2012年第8期7卷 627-634页

作者： Joonho Shin EunJoo Yang KyeHee Cho Carmelo L Barcenas Woo Jin Kim nam-jong Paik Department of Rehabilitation Medicine Bundang Hospital College of Medicine Seoul National University

Proper stimulation to affected cerebral hemisphere would promote the functional recovery of patients with stroke. Effects of repetitive transcranial magnetic stimulation on cortical excitability can be can be altered by the stimulation frequency, intensity and duration. There has been no consistent recognition regarding the best stimulation frequency and intensity. This study reviews the intervention effects of repetitive transcranial stimulation on motor impairment, dysphagia, visuospatial neglect and aphasia, and summarizes the stimulation frequency, intensity and area for repetitive transcranial magnetic stimulation to yield the best therapeutic effects.

关键词： stroke repetitive transcranial magnetic stimulation rehabilitation review

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Small-scale analysis of brittle-to-ductile transition behavior in pure tungsten

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Journal of Materials Science & Technology 2022年第10期105卷 242-258页

作者： Yeonju Oh Won-Seok Ko Nojun Kwak Jae-il Jang Takahito Ohmura Heung nam han Department of Materials Science and Engineering&Research Institute of Advanced Materials Seoul National UniversitySeoul 08826South Korea School of Materials Science and Engineering University of UlsanUlsan 44610South Korea Division of Materials Science and Engineering Hanyang UniversitySeoul04763South Korea National Institute for Materials Science 1-2-1 SengenTsukubaIbaraki 305-0047Japan

Tungsten as a material exhibits broad and increasingly important applications;however,the characterization of its ductile-to-brittle transition(BDT)is currently limited to large-scale scenarios and destructive *** this study,we overcome this challenge by implementing small-scale techniques to provide a comprehensive understanding of the BDT behavior of pure *** order to predict the failure mode at various temperature ranges,the practical fracture analysis diagram has been proposed to describe the resistance to shear flow and cracking behavior with *** temperature nano-indentation tests have provided the inherent mechanical responses corresponding to the maximum shear stress at various temperatures,which is required for dislocation activities in an atomic scaled activation *** one hand,atomistic simulations have provided the temperature dependence of brittle fracture stress,where the atomic bonds break due to intergranular or intragranular *** considered four tungsten specimens having various microstructures prepared using different processing conditions of cold-rolling and post-annealing,and their BDT ranges were inferred using the obtained fracture analysis diagram with the statistical data *** fracture analysis diagram of each specimen obtained were compared with the direct observation of fracture responses in macroscopic mechanical tests,which conclusively indicated that the small-scale inherent mechanical properties are greatly relevant to the macroscopic BDT behavior in pure *** on the BDT estimations by small-scale characterization,we provided further insights into the factors affecting the BDT behavior of tungsten,focusing on the contributions of different types of dislocations.

关键词： Brittle-to-ductile transition Nano-indentation Molecular dynamics Dislocation Tungsten

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A Compact Tri-Band Antenna Based on Inverted-L Stubs for Smart Devices

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Computers, Materials & Continua 2022年第2期70卷 3321-3331页

作者： Niamat Hussain Anees Abbas Sang-Myeong Park Seong Gyoon Park nam Kim Department of Information and Communication Engineering Chungbuk National UniversityCheongju28644Korea Department of Information and Communication Engineering Kongju National UniversityKongju32588Korea

We designed and constructed a novel,compact tri-band monopole antenna for intelligent *** behavior was achieved by placing inverted-L shaped stubs of various lengths in a triangular monopole antenna fed by a coplanar *** resonance frequency of each band can be controlled by varying the length of the corresponding *** bands,at 2.4(2.37-2.51),3.5(3.34-3.71),and 5.5(4.6-6.4)GHz,were easily obtained using three stubs of different *** miniaturization,a portion of the longest stub(at 2.4 GHz)was printed on the opposite side of the substrate,and connected to the main stub via a shorting *** validate the concept,the antenna was fabricated on a low-cost 1.6-mm-thick FR-4 substrate with dimensions of 20×15×1.6 mm^(3).The antenna exhibited a moderate average gain of 2.9 dBi with an omnidirectional radiations over the bandwidths required for RFID,Bluetooth,ISM,WiMAX,andWLAN-band *** features make the antenna suitable for compact smart devices.

关键词： Multiband antenna compact antenna tri-band antenna CPW antenna stub-loaded antenna

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Data Utilization-Based Adaptive Data Management Method for Distributed Storage System in WAN Environment

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Computer Systems Science & Engineering 2023年第9期46卷 3457-3469页

作者： Sanghyuck nam Jaehwan Lee Kyoungchan Kim Mingyu Jo Sangoh Park School of Computer Science and Engineering Chung-Ang UniversitySeoul06974Korea Department of Computer Science and Engineering Kongju National UniversityCheonan31080Korea Qucell Networks Seongnam13590Korea

Recently,research on a distributed storage system that efficiently manages a large amount of data has been actively conducted following data production and demand *** expansion limits exist for traditional standalone storage systems,such as I/O and file system ***,the existing distributed storage system does not consider where data is consumed and is more focused on data dissemination and optimizing the lookup cost of data *** this leads to system performance degradation due to low locality occurring in a Wide Area Network(WAN)environment with high network *** problem hinders deploying distributed storage systems to multiple data centers over *** lowers the scalability of distributed storage systems to accommodate data storage *** paper proposes a method for distributing data in a WAN environment considering network latency and data locality to solve this problem and increase overall system *** proposed distributed storage method monitors data utilization and locality to classify data temperature as hot,warm,and *** assigned data temperature,the proposed algorithm adaptively selects the appropriate data center and places data accordingly to overcome the excess latency from the WAN environment,leading to overall system performance *** paper also conducts simulations to evaluate the proposed and existing distributed storage *** result shows that our proposed method reduced latency by 38%compared to the existing ***,the proposed method in this paper can be used in large-scale distributed storage systems over a WAN environment to improve latency and performance compared to existing methods,such as consistent hashing.

关键词： Distributed system distributed storage distributed computing object storage

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Wire-Shaped 3D-Hybrid Supercapacitors as Substitutes for Batteries

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Nano-Micro Letters 2020年第2期12卷 211-223页

作者： Kyeong‑nam Kang Ananthakumar Ramadoss Jin‑Wook Min jong‑Chul Yoon Deokjung Lee Seok Ju Kang Ji‑Hyun Jang School of Energy and Chemical Engineering Low Dimensional Carbon Materials CenterUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Laboratory for Advanced Research in Polymeric Materials Central Institute of Plastic Engineering and TechnologyBhubaneswar 751024India School of Mechanical Aerospace and Nuclear EngineeringUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea

We report a wire-shaped three-dimensional(3D)-hybrid supercapacitor with high volumetric capacitance and high energy density due to an interconnected 3D-configuration of the electrode allowing for large number of electrochemical active sites,easy access of electrolyte ions,and facile charge transport for flexible wearable *** interconnected and compact electrode delivers a high volumetric capacitance(gravimetric capacitance)of 73 F cm−3(2446 F g−1),excellent rate capability,and cycle *** 3D-nickel cobalt-layered double hydroxide onto 3D-nickel wire(NiCo LDH/3D-Ni)//the 3D-manganese oxide onto 3D-nickel wire(Mn3O4/3D-Ni)hybrid supercapacitor exhibits energy density of 153.3 Wh kg−1 and power density of 8810 W kg−*** red lightemitting diode powered by the as-prepared hybrid supercapacitor can operate for 80 min after being charged for tens of seconds and exhibit excellent electrochemical stability under various deformation *** results verify that such wire-shaped 3D-hybrid supercapacitors are promising alternatives for batteries with long charge–discharge times,for smart wearable and implantable devices.

关键词： Three-dimensional(3D)metal current collector Flexible hybrid supercapacitor Wire-shaped supercapacitor High energy density device Fast charging energy storage system

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Evaluation of immobilizing agents as soil quality conditioners in addition to their metal(loid) immobilizing effect

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Pedosphere 2022年第2期32卷 307-316页

作者： Chaw Su LWIN Mina LEE Young-nam KIM Gary OWENS Kwon-Rae KIM Department of Soil and Water Science Yezin Agricultural UniversityYezinNaypyitaw 15013Myanmar Department of Smart-Agro Industry Gyeongsang National UniversityJinju 52725Korea Institute of Agriculture and Life Science(IALS) Gyeongsang National UniversityJinju 52828Korea Environmental Contaminants Group Future Industries InstituteUniversity of South AustralianMawson Lakes SA 5095Australia

In trace metal (TM)-contaminated agricultural soils,management of TM availability is important for safe crop *** addition,maintenance or improvement of soil quality is vital for sustainable crop *** TM phytoavailability and increased soil quality can be achieved by the application of various immobilizing agents to soil,which can supply both macronutrients and organic *** study investigated the long-term influences of four common immobilizing agents on soil biogeochemical properties and the phytoavailability of TMs in mixed metal-contaminated soil from a cultivated upland near an abandoned mining *** (L),gypsum (G),fly ash (F),and animal manure-based compost (C) were applied to pots containing contaminated soil,either individually or in *** incubation for three years under sequential cultivation of two crops and fallow,soil biogeochemical properties were determined,and Brassica rapa plant bioassay was *** phytoavailability of all TMs (both cationic metals and anionic metalloids) remained significantly lower in soils treated with immobilizing agents even after three years,when compared with the no-agent control (CK) *** addition,the soil quality was significantly improved by treatment with immobilizing *** instance,the C and L+C treatments were the most effective in improving soil physical (bulk density,porosity,and water-resistant aggregate stability),chemical (pH,organic matter,total nitrogen,cation exchange capacity,and plant-available phosphorus,magnesium,and potassium),and biological (microbial biomass carbon and dehydrogenase activity) *** improvement of soil properties and lowering of TM bioavailability were also consistent with the most significant increase in *** biomass production observed in the C treatment,followed by the L+C,G+F,L,G,F,and L+G treatments,as compared with that in *** results indicate that the function of the TM-immobilizing agent as a soil qualit

关键词： crop production metal bioavailability metal immobilization metal phytoavailability soil amendments soil biogeochemical properties soil remediation trace metals

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Hybrid Optimisation with Black Hole Algorithm for Improving Network Lifespan

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Intelligent Automation & Soft Computing 2023年第2期35卷 1873-1887页

作者： S.Siamala Devi Chandrakala Kuruba Yunyoung nam Mohamed Abouhawwash Department of Computer Science and Engineering Sri Krishna College of TechnologyCoimbatore641042India Department of Computer Science and Engineering Vignan Nirula Institute of Technology and ScienceGuntur522009India Department of Computer Science and Engineering Soonchunhyang UniversityAsan31538Korea Department of Mathematics Faculty of ScienceMansoura UniversityMansoura35516Egypt Department of Computational Mathematics Scienceand Engineering(CMSE)Michigan State UniversityEast LansingMI48824USA

Wireless sensor networks(WSNs)are projected to have a wide range of applications in the *** fundamental problem with WSN is that it has aﬁnite *** a network is a common strategy for increasing the life-time of WSNs and,as a result,allowing for faster data *** cluster-ing algorithm’s goal is to select the best cluster head(CH).In the existing system,Hybrid grey wolf sunﬂower optimization algorithm(HGWSFO)and optimal clus-ter head selection method is *** does not provide better competence and out-put in the ***,the proposed Hybrid Grey Wolf Ant Colony Optimisation(HGWACO)algorithm is used for reducing the energy utilization and enhances the lifespan of the *** hole method is used for selecting the cluster heads(CHs).The ant colony optimization(ACO)technique is used toﬁnd the route among origin CH and *** open cache of nodes,trans-mission power,and proximity are used to improve the CH *** grey wolf optimisation(GWO)technique is the most recent and well-known optimiser module which deals with grey wolves’hunting activity(GWs).These GWs have the ability to track down and encircle *** GWO method was inspired by this hunting *** proposed HGWACO improves the duration of the net-work,minimizes the power consumption,also it works with the large-scale *** HGWACO method achieves 25.64%of residual energy,25.64%of alive nodes,40.65%of dead nodes also it enhances the lifetime of the network.

关键词： Energy efﬁciency power consumption lifespan of the network black hole method ant colony optimisation routing and cluster heads(CHs)

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