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Gria:an efficient deterministic concurrency control protocol

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Frontiers of Computer Science 2024年第4期18卷 25-37页

作者： Xinyuan WANG yun peng Hejiao HUANG School of Computer Science and Technology Harbin Institute of TechnologyShenzhen 518055China Institute of Artificial Intelligence and Blockchain Guangzhou UniversityGuangzhou 510006China

Deterministic databases are able to reduce coordination costs in a *** property has fostered a significant interest in the design of efficient deterministic concurrency control ***,the state-of-the-art deterministic concurrency control protocol Aria has three ***,it is impractical to configure a suitable batch size when the read-write set is ***,Aria running in low-concurrency scenarios,e.g.,a single-thread scenario,suffers from the same conflicts as running in high-concurrency ***,the single-version schema brings write-after-write *** address these issues,we propose Gria,an efficient deterministic concurrency control *** has the following ***,the batch size of Gria is ***,Gria’s conflict probability in low-concurrency scenarios is lower than that in high-concurrency ***,Gria has no write-after-write conflicts by adopting a multi-version *** further reduce conflicts,we propose two optimizations:a reordering mechanism as well as a rechecking *** evaluation result on two popular benchmarks shows that Gria outperforms Aria by 13x.

关键词： deterministic concurrency control transaction processing

Synthesis and Crystal Structure of a Novel Ternary Ni(II) Complex with 2-Hydroxyl-1,10- phenanthroline and 2-Hydroxynicotinic Acid as Ligands

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Chinese Journal of Structural Chemistry 2006年第6期25卷 747-751页

作者： WANG Jian-Ge DU Qiao-yun LI peng-yun Department of Chemistry Luoyang Normal University Luoyang 471022 China

A novel ternary complex of [NiL1L2·2H2O]·NO3·H2O （L1 = 2-hydroxyl-1,10-phenanthroline （HOphen）, L2 = 2-hydroxynicotinic acid （H2nicO）） was synthesized, and its crystal structure was determined by X-ray diffraction and further characterized by infrared and elementary analysis. The title complex （C18H18NiN4O10, Mr = 509.07） belongs to the triclinic system, space group P1^- with a = 712490（7）, b = 11.0164（10）, c = 13.3864（13）A, α = 91.6040（10）,β= 98.8620（10）, γ= 107.1140（10）°, V= 1006.43（17）A^3, Z = 2, Dc = 1.680 g/cm^3,μ= 1.032 mm^-1, F（000） = 524, the final R = 0.0461 and wR= 0.1238. In the complex, the Ni（H） ion is six-coordinated to assume a distorted octahedral geometry, and a 3D supramolecular network comes into being via weak intermolecular interactions of X-O--.H （X = N, O）.

关键词： 2-hydroxyl-1,10-phenanthroline 2-hydroxynicotinic acid nickel complex crystal structure

On Dynamics of Infinitely Generated Contractive Mapping Systems on pZ_p

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Acta Mathematica Sinica,English Series 2020年第6期36卷 651-662页

作者： Jing Hua YANG yun peng XIAO Department of Mathematics College of SciencesShanghai UniversityShanghai 200444P.R.China

Let p≥2 be a prime number and Zp be the ring of p-adic *** G be a semigroup generated by infinitely many contractive maps on p *** is shown that if G satisfies the open tiling conditions,then there exists a shift transformation on the limit set of G and the shift transformation is ergodic with respect to the Haar measure on p *** an application,we can generalize p-adic Khinchin’s Theorem and p-adic Lochs’Theorem to any infinitely generated semigroup by use of the ergodicity of the shift transformation.

关键词： Contractive maps ergodic limit sets p-adic continued fractions

Establishment of injury models in studies of biological effects induced by microwave radiation

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Military Medical Research 2021年第2期8卷 253-272页

作者： yun-Fei Lai Hao-Yu Wang Rui-yun peng Beijing Institute of Radiation Medicine Beijing 100850China

Microwave radiation has been widely used in various fields,such as communication,industry,medical treatment,and military *** radiation may cause injuries to both the structures and functions of various organs,such as the brain,heart,reproductive organs,and endocrine organs,which endanger human ***,it is both theoretically and clinically important to conduct studies on the biological effects induced by microwave *** successful establishment of injury models is of great importance to the reliability and reproducibility of these *** this article,we review the microwave exposure conditions,subjects used to establish injury models,the methods used for the assessment of the injuries,and the indicators implemented to evaluate the success of injury model establishment in studies on biological effects induced by microwave radiation.

关键词： Microwave radiation Injury model Biological effects Methods Biological indicators Review

VColor^(*):a practical approach for coloring large graphs

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Frontiers of Computer Science 2021年第4期15卷 133-149页

作者： yun peng Xin LIN Byron CHOI Bingsheng HE Department of Computer Science Hong Kong Baptist UniversityHong Kong 999077China School of Computer Science and Technology East China Normal UniversityShanghai 200062China School of Computing National University of SingaporeSingapore 119077Singapore

Graph coloring has a wide range of real world applications,such as in the operations research,communication network,computational biology and compiler optimization *** our recent work[1],we propose a divide-andconquer approach for graph coloring,called *** an approach has three generic subroutines.(i)Graph partition subroutine:VColor partitions a graph G into a vertex cut partition(VP),which comprises a vertex cut component(VCC)and small non-overlapping connected components(CCs).(ii)Component coloring subroutine:VColor colors the VCC and the CCs by efficient algorithms.(iii)Color combination subroutine:VColor combines the local colors by exploiting the maximum matchings of color combination bigraphs(CCBs).VColor has revealed some major bottlenecks of efficiency in these ***,in this paper,we propose VColor^(*),an approach which addresses these efficiency bottlenecks without using more colors both theoretically and *** technical novelties of this paper are the following.(i)We propose the augmented VP to index the crossing edges of the VCC and the CCs and propose an optimized CCB construction algorithm.(ii)For sparse CCs,we propose using a greedy coloring algorithm that is of polynomial time complexity in the worst case,while preserving the approximation ratio.(iii)We propose a distributed graph coloring *** extensive experimental evaluation on real-world graphs confirms the efficiency of VColor^(*).In particular,VColor^(*)is 20X and 50X faster than VColor and uses the same number of colors with VColor on the Pokec and PA datasets,***^(*)also significantly outperforms the state-ofthe-art graph coloring methods.

关键词： graph coloring approximation algorithm distributed algorithm

Bayesian Estimation for Generalized Exponential Distribution Based on Progressive Type-I Interval Censoring

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Acta Mathematicae Applicatae Sinica 2013年第2期29卷 391-402页

作者： Xiu-yun peng Zai-zai YAN Science College Inner Mongolia University of Technology

In this study, we consider the Bayesian estimation of unknown parameters and reliability function of the generalized exponential distribution based on progressive type-I interval censoring. The Bayesian estimates of parameters and reliability function cannot be obtained as explicit forms by applying squared error loss and Linex loss functions, respectively; thus, we present the Lindley＇s approximation to discuss these estimations. Then, the Bayesian estimates are compared with the maximum likelihood estimates by using the Monte Carlo simulations.

关键词： Bayesian inference Lindley's approximation Monte Carlo method

Painlevé-Kuratowski Convergences of the Solution Sets for Perturbed Vector Equilibrium Problems without Monotonicity

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Acta Mathematicae Applicatae Sinica 2014年第4期30卷 845-858页

作者： Zai-yun peng Xin-min YANG College of Science Chongqing JiaoTong University Department of Mathematics Chongqing Normal University

In this paper, we obtain some stability results for perturbed vector equilibrium problems. Under new assumptions, which are weaker than the assumption of C-strict monotonicity, we provide sufficient conditions for the Painlev^-Kuratowski Convergence of the weak efficient solution sets and efficient solution sets for the perturbed vector equilibrium problems with a sequence of mappings converging in real linear metric spaces. These results extend and improve some known results in the literature.

关键词： stability Painlev6-Kuratowski convergence efficient solution perturbed vector equilibrium prob-lem scalarization

Effects of Magnetic Shear on Current Penetration in a Tokamak

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Chinese Physics Letters 2001年第6期18卷 802-804页

作者： ZHANG peng-yun WANG Long Institute of Physics Chinese Academy of SciencesBeijing 100080

The penetrations of the parallel and perpendicular components of plasma currents are interrelated to each other due to the existence of magnetic shear in a tokamak *** of the shear on the penetration of Fourier components of toroidal plasma current are analysed in a cylindrical column *** current penetration is obviously strengthened by the shear for a bell-like conductivity profile and low safety factor and low aspect ratio.

关键词： tokamak strengthened cylindrical

Research progress in the effects of terahertz waves on biomacromolecules

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Military Medical Research 2022年第1期9卷 63-70页

作者： Liu Sun Li Zhao Rui-yun peng Beijing Institute of Radiation Medicine Haidian District27 Taiping RoadBeijing 100850China

With the rapid development of terahertz technologies,basic research and applications of terahertz waves in biomedicine have attracted increasing *** rotation and vibrational energy levels of biomacromolecules fall in the energy range of terahertz waves;thus,terahertz waves might interact with ***,terahertz waves have been widely applied to explore features of the terahertz spectrum of ***,the effects of terahertz waves on biomacromolecules are largely *** some progress has been reported,there are still numerous technical barriers to clarifying the relation between terahertz waves and biomacromolecules and to realizing the accurate regulation of biological macromolecules by terahertz ***,further investigations should be conducted in the *** this paper,we reviewed terahertz waves and their biomedical research advantages,applications of terahertz waves on biomacromolecules and the effects of terahertz waves on *** findings will provide novel ideas and methods for the research and application of terahertz waves in the biomedical field.

关键词： Terahertz waves Biomacromolecules Effect Review