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A survey and Experimental Review on Data Distribution strategies for Parallel s.a.ial Clustering Algorithms

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Journal of Computer science & Technology 2024年第3期39卷 610-636页

作者： Jagat sesh Challa Navneet Goyal Amogh s.a.ma Nikhil sreekumar sundar Balasubramaniam Poonam Goyal Advanced Data Analytics.a.d Parallel technologies Laboratory Birla Institute of Technology and Science Pilani 333031India Uber New York 11101U.S.A. Computer science and Engineering Department University of MinnesotaMinneapolis 55455U.S.A.

The advent of Big Data has led to the rapid growth in the usage of parallel clustering algorithms that work over distributed computing frameworks such as MPI,MapReduce,and *** important step for any parallel clustering algorithm is the distribution of data amongst the cluster *** step governs the methodology and performance of the entire *** typically use random,or a s.a.ial/geometric distribution strategy like kd-tree based partitioning and grid-based partitioning,as per the requirements of the ***,these strategies.a.e generic and are not tailor-made for any specific parallel clustering *** this paper,we give a very comprehensive literature survey of MPI-based parallel clustering algorithms with special reference to the specific data distribution strategies they *** also propose three new data distribution strategies namely Parameterized Dimensional split for parallel density-based clustering algorithms like DBs.a. and OPTICs,Cell-Based Dimensional split for dGridsLINK,which is.a.grid-based hierarchical clustering algorithm that exhibits efficiency for disjoint s.a.ial distribution,and Projection-Based split,which is.a.generic distribution *** of these preserve s.a.ial locality,achieve disjoint partitioning,and ensure good data load *** experimental analysis shows the benefits of using the proposed data distribution strategies for algorithms they are designed for,based on which we give appropriate recommendations for their usage.

关键词： parallel data mining data distribution parallel clustering s.a.ial locality preservation

Gliding arc discharge in combination with Cu/Cu_(2)O electrocatalysis for ammonia production

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Plas.a.science and Technology 2024年第7期26卷 67-73页

作者：刘学张佳伟何弈黄嘉敏马晓萍张潇漫卢曼婷辛煜 Jiangsu Key Laboratory of Thin Films School of Physical Science and TechnologySoochow UniversitySuzhou 215006People’s Republic of China Jiangsu Key Laboratory of Advanced Negative Carbon technologies Soochow UniversitySuzhou 215123People’s Republic of China

Highly efficient and green ammonia production is.a. important demand for modern *** this study,a two-step ammonia production method is developed using a gliding arc discharge in combination with Cu/Cu_(2)O *** this method,NO_(x)is provided by the gliding arc discharge and then electrolyzed by Cu/Cu_(2)O after alkaline *** electrical characteristics,the optical characteristics.a.d the NO_(x)production are investigated in discharges.a. different input voltage and the gas *** dependence of ammonia production through Cu/Cu_(2)O electrocatalysis on pH value and reduction potential are determined by colorimetric *** our study,two discharge modes.a.e *** high input voltage and low gas flow,the discharge is operated with a s.a.le plas.a.channel which is called the steady arc gliding discharge mode(A-G mode).As lowering input voltage and raising gas flow,the plas.a.channel is destroyed and high frequency breakdown occurs instead,which is known as the breakdown gliding discharge mode(B-G mode).The optimal NO_(x)production of 7.34 mmol h^(-1)is obtained in the transition s.a.e of the two discharge *** ammonia yield reaches0.402 mmol h^(-1)cm^(-2)at pH value of 12.7 and reduction potential of-1.0 V versus reversible hydrogen electrode(RHE).

关键词： gliding arc discharge nitrogen fixation Cu/Cu_(2)O catalyst electrocatalytic reduction of nitrite

Efficient activation of the Co/s.a.15catalyst by high-frequency AC-DBD plas.a.thermal effects for toluene removal

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Plas.a.science and Technology 2024年第8期26卷 84-94页

作者：李越姜楠刘政妍秦亮彭邦发王荣刚孙玉荣李杰 school of Environment Dalian University of TechnologyDalian 116024People’s Republic of China school of Electrical Engineering Dalian University of TechnologyDalian 116024People’s Republic of China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China Canmax technologies Co. Ltd.Suzhou 215121People’s Republic of China

Dielectric barrier discharge(DBD)plas.a.excited by a high-frequency alternating-current(AC)power supply is widely employed for the degradation of volatile organic compounds(VOCs).However,the thermal effect generated during the discharge process leads to energy waste and low energy utilization *** this work,an innovative DBD thermally-conducted catalysis(DBD-TCC)system,integrating high-frequency AC-DBD plas.a.and its generated thermal effects to activate the Co/s.a.15 catalyst,was employed for toluene ***,Co/s.a.15 catalysts.a.e closely positioned to the ground electrode of the plas.a.zone and can be heated and activated by the thermal effect when the voltage exceeds 10 k ***12.4 k V,the temperature in the catalyst zone reached 261℃ in the DBD-TCC system,resulting in an increase in toluene degradation efficiency of 17%,CO_(2)selectivity of 21.2%,and energy efficiency of 27%,respectively,compared to the DBD system *** contrast,the DBD thermally-unconducted catalysis(DBD-TUC)system fails to enhance toluene degradation due to insufficient heat absorption and catalytic activation,highlighting the crucial role of AC-DBD generated heat in the activation of the ***,the degradation pathway and mechanism of toluene in the DBD-TCC system were *** work is expected to provide an energy-efficient approach for high-frequency AC-DBD plas.a.removal of VOCs.

关键词： high-frequency alternating-current power thermal effect dielectric barrier discharge toluene degradation Co/s.a.15 catalysts

solar and wind energy potential assessment for Razavi Khorasan Province in Iran

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Journal of Central south University 2024年第6期31卷 2027-2038页

作者： HOssEINI Amirpouya RAMEZANI Faeze MIRHOssEINI Mojtaba school of Advanced technologies Iran University of Science and TechnologyTehranIran

This study aims to evaluate the solar and wind energy potential across Razavi Khorasan Province,Iran,with a specific focus on the Khaf region.A preliminary assessment of mean solar radiation,mean wind speeds.a.d Weibull distribution parameters was conducted for different towns.a.d zones within the *** findings showed that Khaf has favorable characteristics for further *** solar and wind energy metrics examined include global horizontal irradiance,clearness index,wind rose patterns.a.d turbulence *** a height of 40 m,Khaf’s wind power density reached 1650 W/m^(2),indicating exceptional wind energy generation ***,Khaf received an average annual solar radiation of 2046 kW·h/m^(2),representing significant solar energy *** these subs.a.tial renewable resources in Khaf could allow Razavi Khorasan Province to reduce reliance on fossil fuels,improve energy sus.a.nability,and mitigate climate change *** res.a.ch contributes.a. in-depth assessment of Razavi Khorasan's solar and wind energy potential,particularly for the promising Khaf *** work may examine optimal sites for renewable energy projects.a.d grid integration strategies to leverage these resources.

关键词： solar energy wind energy Razavi Khorasan radiation Weibull distribution

Effects of power on ion behaviors in radio-frequency magnetron sputtering of indium tin oxide(ITO)

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Plas.a.science and Technology 2024年第7期26卷 116-122页

作者：李茂洋莫超超陈佳丽季佩宇谭海云张潇漫崔美丽诸葛兰剑吴雪梅黄天源 school of Physical science and Technology Soochow UniversitySuzhou 215000People’s Republic of China Key Lab of Thin Film Materials of Jiangsu Province Suzhou 215000People’s Republic of China suzhou Maxwell technologies Co.Ltd. Suzhou 215000People’s Republic of China school of Optical and Electronic Information Suzhou City University&Suzhou Key Laboratory of BiophotonicsSuzhou 215104People’s Republic of China school of Optoelectronic science and Engineering Soochow UniversitySuzhou 215000People’s Republic of China Analysis.a.d Testing Center Soochow UniversitySuzhou 215000People’s Republic of China school of Aviation and Transportation Jiangsu College of Engineering and TechnologyNantong 226006People’s Republic of China

This study delves into ion behavior at the substrate position within RF magnetron discharges utilizing an indium tin oxide(ITO)*** positive ion energies exhibit an upward trajectory with increasing RF power,attributed to heightened plas.a.potential and initial emergent ***,the positive ion flux es.a.ates owing to amplified sputtering rates.a.d electron ***,negative ions exhibit broad ion energy distribution functions(IEDFs)characterized by multiple *** patterns.a.e clarified by a combination of radiofrequency oscillation of cathode voltage and plas.a.potential,alongside ion transport *** elucidation finds validation in a one-dimensional model encompassing the initial ion *** higher RF power,negative ions surpassing 100 e V es.a.ate in both flux and energy,posing a potential risk of sputtering damages to ITO layers.

关键词： RF magnetron sputtering ITO film ion energy distribution functions plas.a.diagnosis

Novel intelligent reasoning system for tool wear prediction and parameter optimization in intelligent milling

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Advances in Manufacturing 2024年第1期12卷 76-93页

作者： Long-Hua Xu Chuan-Zhen Huang Zhen Wang Han-Lian Liu shui-Quan Huang Jun Wang school of Mechanical Engineering Yanshan UniversityQinhuangdao066004HebeiPeople’s Republic of China Center for Advanced Jet Engineering technologies(CaJET) Key Laboratory of High-efficiency and Clean Mechanical Manufacture(Ministry of Education)National Experimental Teaching Demonstration Center for Mechanical Engineering(Shandong University)School of Mechanical EngineeringShandong UniversityJinan250061People’s Republic of China Institute of Manufacturing Technology Guangdong University of TechnologyGuangzhou510006People’s Republic of China

Accurate intelligent reasoning systems.a.e vital for intelligent *** this study,a new intelligent reasoning system was developed for milling processes to accurately predict tool wear and dynamically optimize machining *** developed system consists of a self-learning algorithm with an improved particle s.a.m optimization(IPsO)learning algorithm,prediction model determined by an improved case-based reasoning(ICBR)method,and optimization model containing an improved adaptive neural fuzzy inference system(IANFIs.a.d *** results showed that the IPsO algorithm exhibited the best global convergence *** ICBR method was observed to have a better performance in predicting tool wear than s.a.dard CBR *** IANFIs model,in combination with IPsO,enabled the optimization of multiple objectives,thus generating optimal milling *** paper offers.a.practical approach to developing accurate intelligent reasoning systems for sus.a.nable and intelligent manufacturing.

关键词： Improved particle s.a.m optimization(IPsO)algorithm Improved case-based reasoning(ICBR)method Adaptive neural fuzzy inference system(ANFIs)model Tool wear prediction Intelligent manufacturing

Flexible, Trans.a.ent and Conductive Metal Mesh Films with Ultra‑High FoM for stretchable Heating and Electromagnetic Interference shielding

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Nano-Micro Letters 2024年第5期16卷 201-213页

作者： Zibo Chen s.a.dian Yang Junhua Huang Yifan Gu Weibo Huang s.a.yong Liu Zhiqiang Lin Zhiping Zeng Yougen Hu Zimin Chen Boru Yang Xuchun Gui s.a.e Key Laboratory of Optoelectronic Materials.a.d technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275People’s Republic of China Guangdong Provincial Key Laboratory of Materials for High Density Electronic Packing Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongPeople’s Republic of China school of Materials science and Engineering Sun Yat-Sen UniversityGuangzhou 510275People’s Republic of China

Despite the growing demand for trans.a.ent conductive films in s.a.t and wearable electronics for electromagnetic interference(EMI)shielding,achieving a flexible EMI shielding film,while maintaining a high transmittance remains.a.significant ***,a flexible,trans.a.ent,and conductive copper(Cu)metal mesh film for EMI shielding is fabricated by self-forming crackle template method and electroplating *** Cu mesh film shows.a. ultra-low sheet resis.a.ce(0.18Ω□^(-1)),high transmittance(85.8%@550 nm),and ultra-high figure of merit(>13,000).It also has satis.a.tory stretchability and mechanical s.a.ility,with a resis.a.ce increases of only 1.3%after 1,000 bending *** a stretchable heater(ε>30%),the saturation temperature of the film can reach over 110°C within 60 s.a. 1.00 V applied ***,the metal mesh film exhibits outs.a.ding average EMI shielding effectiveness of 40.4 dB in the X-band at the thickness of 2.5μ*** a demonstration,it is used as.a.trans.a.ent window for shielding the wireless communication electromagnetic ***,the flexible and trans.a.ent conductive Cu mesh film proposed in this work provides.a.promising candidate for the next-generation EMI shielding applications.

关键词： Metal mesh Trans.a.ent conductive film stretchable heater Electromagnetic interference shielding

Learning in games.a.systematic review

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science China(Information sciences) 2024年第7期67卷 133-159页

作者： Rong-Jun QIN Yang YU National Key Laboratory for Novel software Technology Nanjing University Polixir technologies

Game theory studies the mathematical models for self-interested individuals. Nash equilibrium is.a.guably the most central solution in game theory. While finding the Nash equilibrium in general is known as polynomial parity arguments on directed graphs(PPAD)-complete, learning in games provides.a. alternative to approximate Nash equilibrium, which iteratively updates the player's strategy through interactions with other players. Rules.a.d models have been developed for learning in games, such as fictitious play and no-regret learning. Particularly, with recent advances in online learning and deep reinforcement learning,techniques from these fields greatly boost the breakthroughs in learning in games from theory to *** a result, we have witnessed many superhuman game AI systems. The techniques used in these systems evolve from conventional s.a.ch and learning to purely reinforcement learning(RL)-style learning methods,gradually getting rid of the domain knowledge. In this.a.ticle, we systematically review the above techniques,discuss the trend of basic learning rules towards.a.unified framework, and recap applications in large ***, we discuss some future directions.a.d make the prospect of future game AI systems. We hope this.a.ticle will give some insights into designing novel approaches.

关键词： non-cooperative games learning in games no-regret learning reinforcement learning superhuman AI

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Isotropic sintering shrinkage of 3D glass-ceramic nanolattices:backbone preforming and mechanical enhancement

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International Journal of Extreme Manufacturing 2024年第2期6卷 418-426页

作者： Nianyao Chai Yunfan Yue Xiangyu Chen Zhongle Zeng sheng Li Xuewen Wang Center of Femtosecond Laser Manufacturing for Advanced Materials.a.d Devices State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070People’s Republic of China National Energy Key Laboratory for New Hydrogen-Ammonia Energy technologies Foshan Xianhu LaboratoryFoshan 528000People’s Republic of China International school of Materials science and Engineering Wuhan University of TechnologyWuhan 430070People’s Republic of China

There is.a.perpetual pursuit for free-form glasses.a.d ceramics featuring outs.a.ding mechanical properties.a. well as chemical and thermal *** is.a.promising idea to s.a.e inorganic materials in three-dimensional(3D)forms to reduce their weight while maintaining high mechanical properties.a.popular strategy for the preparation of 3D inorganic materials is to mold the organic–inorganic hybrid photoresists into 3D micro-and nano-structures.a.d remove the organic components by subsequent ***,due to the discrete arrangement of inorganic components in the organic-inorganic hybrid photoresists,it remains.a.huge challenge to attain isotropic shrinkage during ***,we demonstrate the isotropic sintering shrinkage by forming the consecutive–si–O–si–O–Zr–O–inorganic backbone in photoresists.a.d fabricating 3D glass–ceramic nanolattices with enhanced mechanical *** femtosecond(fs)laser is used in two-photon polymerization(TPP)to fabricate 3D green body *** subsequent sintering at 1000℃,high-quality 3D glass–ceramic microstructures can be obtained with perfectly intact and smooth ***-suit compression experiments.a.d finite-element simulations reveal that octahedral-truss(oct-truss)lattices possess remarkable adeptness in bearing stress concentration and maintain the structural integrity to resist rod bending,indicating that this structure is.a.candidate for preparing lightweight and high stiffness glass–ceramic nanolattices.3D printing of such glasses.a.d ceramics has significant implications in a number of industrial applications,including metamaterials,microelectromechanical systems,photonic crys.a.s.a.d damage-tolerant lightweight materials.

关键词： 3D printing isotropic shrinkage femtosecond laser two-photon polymerization structural glass-ceramics