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Towards module-based automatic partitioning of Java applications

Frontiers of Computer Science 2012年第6期6卷 725-740页

作者： Ying ZHANG Gang huang Wei ZHANG Xuanzhe LIU Hong mei Key Laboratory of High Confidence Software Technologies(Peking University) Ministry of EducationBeijing 100871China School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China

When reengineering a monolithic application to be a distributed one, programmers always have to decide how many distributed parts the application should be partitioned, and write many codes related to where a part will be placed on network nodes and how these parts communicate with each other through the network. These codes usually have nothing to do with the business functions of the application, and they are laborious to write. In addition, as the distribution architecture of the application is finalized beforehand, it may not adapt well to the everchanging execution environment. In this paper, we propose DPartner, an automatic partitioning system, to help programmers create a distributed Java application without explicitly writing the distribution-related codes. Unlike the other partitioning systems, DPartner does not partition an application directly into the coarse-grained client and server. Instead, it first partitions the application into several modules where each module performs a relatively independent business function of the application. Then it makes these modules be distributable through automatic bytecode rewriting. These modules can distribute in different nodes and cooperate to work just as the original monolithic application. Such a module-based partitioning approach enables a relatively easy reshaping of the distribution architecture of an application, which facilitates the application adapt to the environmental changes without manual recoding or repartitioning with regard to distribution. This paper gives the detailed design of DPartner, and evaluates it using real-world applications. The evaluation results demonstrate the effectiveness and efficiency of DPartner.

关键词： application partitioning distributed computing,DPartner

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4D Printing:History and Recent Progress

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Chinese Journal of Polymer Science 2018年第5期36卷 563-575页

作者： Jing-Jun Wu Li-mei huang Qian Zhao Tao Xie State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering Zhejiang University

4D printing has attracted great interest since the concept was introduced in 2012. The past 5 years have witnessed rapid advances in both 4D printing processes and materials. Unlike 3D printing, 4D printing allows the printed part to change its shape and function with time in response to change in external conditions such as temperature, light, electricity, and water. In this review, we first overview the history of 4D printing and discuss its definition. We then summarize recent technological advances in 4D printing with focuses on methods, materials, and their intrinsic links. Finally, we discuss potential applications and offer perspectives for this exciting new field.

关键词： 4D printing Shape memory polymer Hydrogel Multi-material structure Single-material structure

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Black tea markets worldwide: Are they integrated?

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Journal of Integrative Agriculture 2022年第2期21卷 552-565页

作者： XU Yong-mei QIAO Fang-bin huang Ji-kun School of Economics Zhejiang Gongshang UnviersityHangzhou 310018P.R.China China Economics and Management Academy Central University of Finance and EconomicsBeijing 100081P.R.China China Center for Agricultural Policy Peking UniversityBeijing 100871P.R.China

Global tea consumption has risen significantly alongside rapid expansion of international trade in recent ***,few studies have systematically examined the relationship among the major tea markets *** weekly data from 2012-2019,this study empirically analyzed the price series of the world’s major black tea auction *** estimation results showed that these markets are connected,even though heterogeneities *** finding holds not only for regional markets but also for international *** findings offer important implications for tea-producing countries with millions of smallholder farmers.

关键词： black tea market price integration VECM

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Characterization and analysis of DLC films with different thickness deposited by RF magnetron PECVD

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Rare Metals 2012年第2期31卷 198-203页

作者： huang, Yujie Wang, Qi Wang, mei Fei, Zhenyi Li, Musen

Diamond-like carbon (DLC) films have excellent mechanical and chemical properties similar to those of crystalline diamond giving them wide applications as protective coatings. So far, a variety of methods are employed to deposit DLC films. In this study, DLC films with different thicknesses were deposited on Si and glass substrates using RF magnetron PECVD method with C 4 H 10 as carbon source. The bonding microstructure, surface morphology and tribological properties at different growing stages of the DLC films were tested. Raman spectra were deconvoluted into D peak at about 1370 cm 1 and G peak around 1590 cm 1 , indicating typical features of the DLC films. A linear relationship between the film thickness and the deposition time was found, revealing that the required film thickness may be obtained by the appropriate tune of the deposition time. The concentration of sp 3 and sp 2 carbon atoms in the DLC films was measured by XPS spectra. As the films grew, the sp 3 carbon atoms decreased while sp 2 atoms increased. Surface morphology of the DLC films clearly showed that the films were composed of spherical carbon clusters, which tended to congregate as the deposition time increased. The friction coefficient of the films was very low and an increase was also found with the increase of film thickness corresponding to the results of XPS spectra. The scratch test proved that there was good bonding between the DLC films and the substrates.

关键词： DLC films radio frequency magnetron PECVD characterization thickness

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Searching for isotropic stochastic gravitational-wave background in the international pulsar timing array second data release

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Communications in Theoretical Physics 2022年第10期74卷 83-88页

作者： Zu-Cheng Chen Yu-mei Wu Qing-Guo huang CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesNo.19A Yuquan RoadBeijing 100049China Department of Astronomy Beijing Normal UniversityBeijing 100875China Advanced Institute of Natural Sciences Beijing Normal UniversityZhuhai 519087China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China

We search for isotropic stochastic gravitational-wave background(SGWB)in the International Pulsar Timing Array second data *** modeling the SGWB as a power-law,we find very strong Bayesian evidence for a common-spectrum process,and further this process has scalar transverse(ST)correlations allowed in general metric theory of gravity as the Bayes factor in favor of the ST-correlated process versus the spatially uncorrelated common-spectrum process is 30±*** median and the 90%equal-tail amplitudes of ST mode are A_(ST)=1.29^(+0.51)_(−0.44)×10^(−15),or equivalently the energy density parameter per logarithm frequency isΩSTGW=2.31^(+2.19)_(−1.30)×10^(−9),at frequency of 1 year−***,we do not find any statistically significant evidence for the tensor transverse(TT)mode and then place the 95%upper limits as A_(TT)<3.95×10^(−15),or equivalentlyΩ^(TT)_(GW)<2.16×10^(−9),at frequency of 1 year^(−1).

关键词： stochastic gravitational-wave background pulsar timing array beyond general relativitiy

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Feature Matching via Topology-Aware Graph Interaction Model

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 113-130页

作者： Yifan Lu Jiayi Ma Xiaoguang mei Jun huang Xiao-Ping Zhang the Electronic Information School Wuhan UniversityWuhan 430072China IEEE Tsinghua Berkeley Shenzhen Institute Shenzhen 518071China the Department of Electrical Computer and Biomedical EngineeringToronto Metropolitan UniversityToronto ON M5B 2K3Canada

Feature matching plays a key role in computer vision. However, due to the limitations of the descriptors, the putative matches are inevitably contaminated by massive *** paper attempts to tackle the outlier filtering problem from two aspects. First, a robust and efficient graph interaction model,is proposed, with the assumption that matches are correlated with each other rather than independently distributed. To this end, we construct a graph based on the local relationships of matches and formulate the outlier filtering task as a binary labeling energy minimization problem, where the pairwise term encodes the interaction between matches. We further show that this formulation can be solved globally by graph cut algorithm. Our new formulation always improves the performance of previous localitybased method without noticeable deterioration in processing time,adding a few milliseconds. Second, to construct a better graph structure, a robust and geometrically meaningful topology-aware relationship is developed to capture the topology relationship between matches. The two components in sum lead to topology interaction matching(TIM), an effective and efficient method for outlier filtering. Extensive experiments on several large and diverse datasets for multiple vision tasks including general feature matching, as well as relative pose estimation, homography and fundamental matrix estimation, loop-closure detection, and multi-modal image matching, demonstrate that our TIM is more competitive than current state-of-the-art methods, in terms of generality, efficiency, and effectiveness. The source code is publicly available at http://***/YifanLu2000/TIM.

关键词： Feature matching graph cut outlier filtering topology preserving

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Mass splitting of vector mesons and spontaneous spin polarization under rotation

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Chinese Physics C 2022年第2期46卷 90-104页

作者： Minghua Wei Yin Jiang mei huang School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Department of Physics BeiHang UniversityBeijing 100191China

In this study,we investigate the effect of rotation on the masses of scalar and vector mesons in the framework of the 2-flavor Nambu-Jona-Lasinio *** existence of rotation produces a tedious quark propagator and a corresponding polarization *** applying the random phase approximation,the meson mass is numerically *** is found that the behavior of scalar and pseudoscalar meson masses under angular velocity ω is similar to that at a finite chemical potential;both rely on the behavior of the constituent quark mass and reflect the property related to chiral ***,vector meson ρ masses have a more profound relation to *** analytical and numerical calculations,it turns out that at low temperature and small chemical potential,the mass for spin component s_(z)=0,±1 of a vector meson under rotation exhibits a very simple mass splitting relation m^(s_(z))_(ρ)(ω)=m_(ρ)(ω=0)-ωs_(z),similar to the Zeeman splitting of a charged meson under magnetic ***,the mass of the spin component s_(z)=1 of vector meson ρ decreases linearly with ω and reaches zero at ω_(c)=m_(ρ)(ω=0),which indicates that the system will develop s_(z)=1 vector meson condensation and the system will be spontaneously spin-polarized under rotation.

关键词： rotation QGP meson mass

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Charged pion condensation in anti-parallel electromagnetic fields and nonzero isospin density

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Chinese Physics C 2020年第3期44卷 101-110页

作者： Jingyi Chao mei huang Andrey Radzhabov Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134664033IrkutskRussia

The formation of charged pion condensate in anti-parallel electromagnetic fields and in the presence of the isospin chemical potential is studied in the two-flavor Nambu-Jona-Lasinio *** method of Schwinger proper time is extended to explore the quantities in the off-diagonal flavor space,*** charged *** this framework,π^± are treated as bound states of quarks and not as point-like charged *** isospin chemical potential plays the role of a trigger for charged pion *** obtain the associated effective potential as a function of the strength of the electromagnetic fields and find that it contains a sextic term which possibly induces a weak first order phase *** dependence of pion condensation on model parameters is investigated.

关键词： pion condensate electromagnetic fields weakly first order phase transition

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Criticality of QCD in a holographic QCD model with critical end point

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Chinese Physics C 2019年第2期43卷 46-52页

作者： Xun Chen Danning Li mei huang Central China Normal University Institute of High Energy Physics Chinese Academy of Sciences Department of Physics and Siyuan Laboratory Jinan University University of Chinese Academy of Sciences Theoretical Physics Center for Science Facilities Chinese Academy of Sciences

The thermodynamics of strongly interacting matter near the critical end point are investigated in a holographic QCD model, which can describe the QCD phase diagram in T-μ plane qualitatively. Critical exponents along different axes(α,β,γ,δ) are extracted numerically. It is given that α≈0,β≈0.54,γ≈1.04, and δ≈2.97,which is similar to the three-dimensional Ising mean-field approximation and previous holographic QCD model calculations. We also discuss the possibilities to go beyond the mean field approximation by including the full back-reaction of the chiral dynamics in the holographic framework.

关键词： critical exponents holographic QCD thermodynamics

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Cobalt anchored CN sheet boosts the performance of electrochemical CO oxidation

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Chinese Physics B 2021年第6期30卷 498-503页

作者： Xu Liu Jun-Chao huang Xiang-mei Duan School of Physical Science and Technology Ningbo UniversityNingbo 315211China

Single-atom catalysts(SACs) have attracted great interest due to their significant roles played in applications of environmental protection, energy conversion, energy storage, and so on. Using first-principles calculations with dispersioncorrection, we investigated the structural stability and catalytic activity of Co implanted CN sheet towards CO *** adsorption energy of CO and O_(2) on the catalysts Co@CN and 2 Co@CN are close, thus preventing CO *** three possible CO oxidation mechanisms, termolecular Eley-Rideal is the most appropriate reaction path, and the corresponding rate-limiting reaction barriers of the two systems are 0.42 eV and 0.38 eV, respectively.

关键词： first-principles calculations single-atom catalyst CO oxidation rate-limiting reaction barrier

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