检索结果-南通市图书馆

An efficient atomic cross-chain commitment resisting fork fraud

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2023年第5期17卷 241-243页

作者： Fuqi JIN Wenquan LI lanju kong Qingzhong LI School of Software Shandong UniversityJinan 250101China Research Center Dareway Co. Ltd.Jinan 250102China

1 Introduction Cross-chain transaction,as an essential component of blockchain technology,enables value exchange cross blockchains[1].Atomic cross-chain transaction technology has mainly encountered two challenges:efficiency and *** challenges usually include the pressures on storage,transaction fees(e.g.,gas)or throughput,*** challenges refer to the requirement that the assets traded must be obtained by the intended person for an intended *** which fork fraud is one of the specialized problems,which refers to attackers obtaining assets that should not be obtained by manipulating blockchain *** cross-chaining solutions today are not aware of such malicious *** this study,we propose EAC3,an Efficient Atomic CrossChain Commitment that can resist fork *** introducing a new resource multiplexing strategy,and redesigning the crosschain transaction process,EAC3 can effectively reduce various transaction overheads,and keep the possibility that attackers obtaining assets through secretly manipulating a chain fork at a safe level.

关键词： cross specialized enable

在线全文

学校读者我要写书评

暂无评论

基于数据库日志关联规则挖掘的业务流程优化

计算机集成制造系统 2017年第5期23卷 993-999页

作者：肖宗水孟令童孔兰菊钱进山东大学软件学院山东济南250101 山大地纬软件股份有限公司山东济南250101

针对需要优化的业务流程,提出基于数据库日志之间关联规则挖掘的解决方法。通过对数据库日志向量化使其变为可几何度量的流程日志,并从角度和距离两方面综合分析数据库日志的相似性。采用基于相似性的关联分析算法获得用户行为模式以指... 详细信息

针对需要优化的业务流程,提出基于数据库日志之间关联规则挖掘的解决方法。通过对数据库日志向量化使其变为可几何度量的流程日志,并从角度和距离两方面综合分析数据库日志的相似性。采用基于相似性的关联分析算法获得用户行为模式以指导节点的分裂或合并,实现节点结构重塑从而优化流程。该方法还通过多阶迭代的方式评价关联分析的准确性,使算法可以在合理范围内执行。

关键词：相似性分析关联规则挖掘流程优化

Conformation and Counterion Distribution of Polyelectrolyte in Solution as Viewed from Dielectric Approach

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第9期42卷 1278-1301,I0005页

作者： kong-Shuang Zhao College of Chemistry Beijing Normal UniversityBeijing 100875China

Polyelectrolyte solutions are more variable than uncharged macromolecule due to electrical interaction between charged molecules and surrounding ***,the subject of polyelectrolyte solutions has attracted a wide range of interests in both basic and applied research,and has also been extensively ***,the understanding of the molecular dynamics and conformation of polyelectrolytes in solution remains to be deepened,and universal consensus on some key issues have not been *** methods have contributed to solving the above problems in different ways,including dielectric relaxation spectroscopy(DRS).In this perspective,we briefly reviewed the history of dielectric spectroscopic research on polyelectrolyte solution,with emphasis on summarizing our *** particular,we expound the characteristics of DRS and its ability to obtain the internal information of the system of ***,we evaluate the advantages and limitations of the dielectric method and discussed future prospects of this field.

关键词： Polyelectrolyte Dielectric relaxation spectroscopy Chain conformation Thermosensitive microgel PNIPAM microgel Spherical polyelectrolyte brushes

Quantifying the age peaks,age ranges and weights of detrital ages based on the EM algorithm

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2024年第4期15卷 217-229页

作者： Jintao kong Linfin branch of PetroChina Coalbed Methane Company Limited Linfen 041000Shanxi ProvinceChina PetroChina Coalbed Methane Company Limited Beijing 100028China College of Earth Sciences Jilin UniversityChangchun 130061Jilin ProvinceChina

Detrital geochronology fundamentally involves the quantification of major age ranges and their weights winthin an age *** study presents a streamlined approach,modeling the age distribution of detrital zircons using a normal mixture model,and employs the Expectation-Maximization(EM)algorithm for precise estimations.A method is introduced to automatically select appropriate initial mean values for EM algorithm,enhancing its efficacy in detrital *** process entails multiple trials with varying numbers of age components leading to diverse k-component *** model with the lowest Bayesian Information Criterion(BIC)is identified as the most *** accurate component number and weight determination,a substantial sample size(n>200)is advisable. Our findings based on both synthetic and empirical datasets confirm that the normal mixture model,refined by the EM algorithm,reliably identifies key age parameters with minimal *** a kind of probability density estimator,the normal mixture model offers a novel visualization tool for detrital data and an alternative foundation for KDE in calculating existing similarity *** focus of this study is the critical examination of quantitative metrics for comparing detrital zircon age *** a case study,this study demonstrates that metrics based on empirical cumulative probability distribution(such as K-S and Kuiper statistics)may lead to erroneous *** employment of the Kullback-Leibler(KL)divergence,a metric grounded in probability density estimation,is *** critical values,simulated via the Monte Carlo method,provide more objective benchmarks for these quantitative metrics. All methodologies discussed are encapsulated in a series of MATLAB scripts,available as open-source code and a standalone application,facilitating wider adoption and application in the field.

关键词： Detrital zircongeochronology Expectation-Maximization algorithm Kullback-Leibler divergence Quantifying comparison Age peaks,ageranges,andweights

Flat jet electrochemical milling of TC4 alloy with tailoring backward parallel flow

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第4期37卷 574-592页

作者： Huanghai kong Ningsong QU College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In flat jet electrochemical milling, the electrolyte forms a backward parallel flow after impacting the workpiece, resulting in a weak current density distribution on the workpiece. Poor surface quality usually occurs on the machined titanium alloy surface because it inevitably suffers from the weak current density. In this study, a method of flat jet electrochemical milling with tailoring the backward parallel flow was proposed to eliminate the negative effects caused by the weak current density. Multiphysics simulations are carried out to comprehend the mechanism of flat jetEC milling with tailoring backward parallel flow and better construct the novel tool *** on flat jet electrochemical milling of TC4 alloy with and without tailoring backward parallel flow are conducted. The results reveal that, compared with flat jet electrochemical milling without tailoring backward parallel flow, the recommended tool reduces the surface roughness by86% to 93%, and improves the material removal rate by 93% to 163% with different feed ***, the recommended tool is more conducive to maintaining the inherent hardness of the material. Finally, a surface with low Sa of 0.37 μm is obtained.

关键词： Flat jet electrochemical milling TC4 alloy Surface roughness Micro-hardness Material removal rate

Soil inorganic amendments produce safe rice by reducing the transfer of Cd and increasing key amino acids in brown rice

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第2期136卷 121-132页

作者： Fanyi kong Shenggao Lu Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment Key Laboratory of Environmental Remediation and Ecosystem HealthMinistry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China

The digestibility of cadmium(Cd)in brown rice is directly related to amino acid metabolism in rice and human *** our field study,three kinds of alkaline calcium-rich soil inorganic amendments(SIAs)at three dosages were applied to produce safe rice and improve the quality of rice in Cd-contaminated *** the increased application of SIA,Cd content in iron plaque on rice root significantly increased,the transfer of Cd from rice root to grain significantly decreased,and then Cd content in brown rice decreased *** vitro digestibility of Cd in brown rice was estimated by a physiologically based extraction *** showed that more than 70%of Cd in brown rice could be digested by simulated gastrointestinal *** on the total and digestible Cd contents in brown rice to evaluate the health risk,the application of 2.25 ton SIA/ha could produce safe rice in acidic slightly Cd-contaminated paddy *** amino acids(AAs)in brown rice were determined by high-performance liquid *** contents of 5 key AAs(KAAs)that actively respond to environmental changes increased significantly with the increased application of *** structural equation model indicated that KAAs could be affected by the Cd translocation capacity from rice root to grain,and consequently altered the ratio of indigestible Cd in brown *** formation of indigestible KAAs-Cd complexes by combining KAAs(phenylalanine,leucine,histidine,glutamine,and asparagine)with Cd in brown rice could be considered a potential mechanism for reducing the digestibility of Cd.

关键词： Cadmium digestibility Soil inorganic amendments Safe rice Amino acid Priming effect Health risk

基于专业能力评价模型的业务流程角色协同调优算法

在线全文

学校读者我要写书评

暂无评论

计算机集成制造系统 2020年第6期26卷 1465-1472页

作者：肖宗水潘凤薇张宝晨钱进孔兰菊山东大学软件学院山东济南250101 山大地纬软件股份有限公司山东济南250100

为解决业务流程协同模式中存在的角色能力、权限与职责不匹配的问题,综合考虑角色能力与角色权限,设计了基于角色专业能力评价模型的协同调优算法。首先基于业务流程的数据库操作日志,建立了时间序列模型检测异常业务流程,提出基于元路... 详细信息

为解决业务流程协同模式中存在的角色能力、权限与职责不匹配的问题,综合考虑角色能力与角色权限,设计了基于角色专业能力评价模型的协同调优算法。首先基于业务流程的数据库操作日志,建立了时间序列模型检测异常业务流程,提出基于元路径的环路挖掘算法(MPLMA),从而挖掘业务流程中由协同导致的重复工作;以数据库的操作和流程日志为基础,建立专业能力评价模型,量化评价角色能力;将专业能力评价模型与权限判定方法相结合,优化角色协同模式。实验结果表明,所提基于元路径的环路挖掘算法能够高效率地挖掘出协同实例,所提出的角色协同调优算法能够精确、合理地指导协同模式的优化。

关键词：业务流程时间序列元路径角色权限可支配资源

Competition of Composition Fluctuation Modes in Weakly Segregated Salt-doped Symmetric Diblock Copolymers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第9期42卷 1375-1385,I0008页

作者： Yuan-Xin Zhou Xian kong South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou510640China Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou510640China

Salt-doped block copolymers have widespread applications in batteries,fuel cells,semiconductors,and various industries,where their properties crucially depend on phase separation ***,investigations into salt-doped diblock copolymers have predominantly focused on microphase separation,overlooking the segregation between ionic and polymeric *** study employs weak segregation theory to explore the interplay between phase separation dominated by the polymer-modulated mode and the salt-out-modulated mode,corresponding to microscopic and macroscopic phase separations,*** comparing diblock copolymers doped with salts to those doped with neutral solvents,we elucidate the significant role of charged species in modulating phase *** phase separation mode exhibits a transition between the polymer-modulated and salt-out-modulated modes at different *** systems doped with neutral solvents,this transition is stepwise,while in salt-ion-doped systems,it is *** a sufficiently large Flory-Huggins parameter between ions and polymers,the salt-out-modulated mode becomes dominant,promoting macrophase *** to the solvation effect of salt ions,salt-doped systems are more inclined to undergo microphase ***,we explore factors influencing the critical wavenumber of phase separation,including doping level and the Flory-Huggins parameters between two blocks and between ions and polymeric *** findings reveal that in a neutral solvent environment,these factors alter only the boundary between micro-and macro-phase separations,leaving the critical wavenumber unchanged in microphase separation ***,in a salt-doped environment,the critical wavenumber of microphase separation varies with these *** provides valuable insights into the pivotal role of electrostatics in the phase separation of salt-doped block copolymers.

关键词： Block copolymer Phase separation Field theory Salt-doped

在线全文

学校读者我要写书评

暂无评论

新疆油田高盐含氧体系缓蚀剂的性能研究

工业水处理 2023年第6期43卷 143-149页

作者：李怡成关小红孔兰菊山东大学软件学院山东济南250100 华东师范大学生态与环境科学学院上海200062

为解决油田氧腐蚀问题,以反式对甲氧基肉桂醛、3-氨基苯甲酸为主要原料合成了具有多个吸附位点的席夫碱缓蚀剂TMCAM。首先,通过动态失重法评价了不同浓度的席夫碱缓蚀剂TMCAM在60℃含氧油田模拟配水中对Q235钢的缓蚀性能。结果表明,在TM... 详细信息

为解决油田氧腐蚀问题,以反式对甲氧基肉桂醛、3-氨基苯甲酸为主要原料合成了具有多个吸附位点的席夫碱缓蚀剂TMCAM。首先,通过动态失重法评价了不同浓度的席夫碱缓蚀剂TMCAM在60℃含氧油田模拟配水中对Q235钢的缓蚀性能。结果表明,在TMCAM质量浓度为60 mg/L时,Q235钢的腐蚀速率为0.062 4 mm/a,满足现场要求;TMCAM投加质量浓度为100 mg/L时,Q235钢腐蚀速率仅为0.036 8 mm/a,缓蚀率可达到90%。其次,采用扫描电镜、电化学法、接触角测试等表征技术评价了TMCAM的缓蚀性能并分析其缓蚀机理。结果表明,TMCAM是一种偏阴极的混合型缓蚀剂,TMCAM分子与Fe之间的吸附能力强,且TMCAM可在钢表面形成疏水膜,减少了含氧污水与管道的接触时间,减缓了腐蚀,进而保护了管道。最后,通过分子模拟技术从理论角度分析了缓蚀剂的缓蚀性能与缓蚀剂分子构型之间的关系,结果显示TMCAM分子结构具有较强的吸附能力,高于文献报道的其他席夫碱缓蚀剂。

关键词：席夫碱缓蚀剂电化学化学计算

维普期刊数据库博看期刊