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An Agent-based Adaptive Mechanism for Efficient Job Scheduling in Open and Large-scale Environments

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Journal of Systems Science and Systems Engineering 2021年第4期30卷 400-416页

作者： Yikun Yang fenghui Ren Minjie Zhang School of Computing and Information Technology University of WollongongWollongongNSW2522Australia

Agent-based scheduling refers to applying intelligent agents to autonomously allocate resources to *** agent-based scheduling approaches have achieved good performance in open and dynamic environments because the relationships of agents are *** new jobs and resources and unexpected events,decentralized agents can respond adaptively and ***,decentralized approaches are easy to be extended because there is no central control agent that limits the ***,decentralized approaches might have low efficiency in large-scale environments because behaviors of agents may be self-interested and competitive,due to their local views during decision *** interacting with a large number of agents,each agent may spend a considerable amount of time on failed attempts before reaching the final agreements with other *** improve the efficiency of decentralized agent-based scheduling approaches in large-scale environments,and to keep the flexibility and adaptability of decentralized agents for the decision-making on scheduling,this paper provides a new agent-based adaptive mechanism for efficient job scheduling.A new type of agent named host agent is introduced to coordinate self-interested behaviors of agents without participating in the decision making of agents during job *** proposed mechanism was developed in JADE and tested in open and large-scale *** experimental results indicate that the proposed mechanism is effective and efficient in open and large-scale environments.

关键词： Agent-based scheduling multi-agent system resource allocation

AN ECONOMIC MODEL-BASED MATCHING APPROACH BETWEEN BUYERS AND SELLERS THROUGH A BROKER IN AN OPEN E- MARKETPLACE

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Journal of Systems Science and Systems Engineering 2018年第2期27卷 156-179页

作者： Dien Tuan LE Minjie ZHANG fenghui REN Faculty of E-commerce University of Economics The University of Da Nang Vietnam School of Computing and Information Technology University of Wollongong Australia

A broker in an open e-marketplace enables buyers and sellers to do business with each other. Although a broker plays an important role in e-marketplaces, theory and guidelines for matching between buyers and sellers in multi-attribute exchanges are limited. Therefore, a challenge for a broker＇s responsibility is how to maximize a buyer＇s total satisfaction degree as its goals under the consideration of trade-off between a buyer＇s buying quantity and price paid to a seller, and other attributes. To solve this challenge, this paper proposes an economic model-based matching approach between a buyer＇s requirements and a seller＇s offers. The major contributions of this paper are that （i） a broker can model a seller＇s price policy as per a buyer＇s buying quantity through communication between a broker and a seller; （ii） due to each buyer＇s different quantity demand, a broker models a buyer＇s satisfaction degree as per a buyer＇s buying quantity based on communication between a broker and a buyer; and （iii） to carry out a broker＇s matching processes, an objective function and a set of constraints are generated to help a broker to maximize a buyer＇s total satisfaction degree. Experimental results demonstrate the good performance of the proposed approach.

关键词： E-marketplace broker multi-attributes matching approach economic model objectivefunction

Convergence of multi-block Bregman ADMM for nonconvex composite problems

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Science China(Information Sciences) 2018年第12期61卷 53-64页

作者： fenghui WANG Wenfei CAO Zongben XU School of Mathematics and Statistics Xi'an Jiaotong University Department of Mathematics Luoyang Normal University School of Mathematics and Information Science Shaanxi Normal University

The alternating direction method with multipliers(ADMM) is one of the most powerful and successful methods for solving various composite problems. The convergence of the conventional ADMM(i.e.,2-block) for convex objective functions has been stated for a long time, and its convergence for nonconvex objective functions has, however, been established very recently. The multi-block ADMM, a natural extension of ADMM, is a widely used scheme and has also been found very useful in solving various nonconvex optimization problems. It is thus expected to establish the convergence of the multi-block ADMM under nonconvex frameworks. In this paper, we first justify the convergence of 3-block Bregman ADMM. We next extend these results to the N-block case(N≥3), which underlines the feasibility of multi-block ADMM applications in nonconvex settings. Finally, we present a simulation study and a real-world application to support the correctness of the obtained theoretical assertions.

关键词： nonconvex regularization alternating direction method subanalytic function K-L inequality Bregman distance

EDITORIAL SPECIAL ISSUE ON AGENT-BASED MODELLING FOR COMPLEX SYSTEMS

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Journal of Systems Science and Systems Engineering 2018年第2期27卷 130-133页

作者： Quan Bai fenghui Ren School of Engineering Computer & Mathematical Sciences Auckland University of Technology Auckland New Zealand School of Computing and lnformation Technology University of Wollongong Wollongong Australia

Computer based modelling and simulation has become useful tools to facilitate humans to understand systems in different domains, such as physics, astrophysics, chemistry, biology, economics, engineering and social science. A complex system is featured with a large number of interacting components （agents, processes, etc.）, whose aggregate activities are nonlinear and self-organized. Complex systems are hard to be simulated or modelled by using traditional computational approaches due to the complex relationships of components and distributed features of resources, and dynamic work environments. Meanwhile, smart systems such as multi-agent systems have demonstrated advantages and great potentials in modelling and simulating complex systems.

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High-throughput screening of critical size of grain growth in gradient structured nickel

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Journal of Materials Science & Technology 2021年第23期82卷 33-39页

作者： Yunli Lu fenghui Duan Jie Pan Yi Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

Nanocrystalline metals with high Gibbs free energy have a strong tendency towards thermally driven grain growth,thus understanding the critical size or temperature of grain growth is vital for their *** investigations of thermal stability were usually conducted on the materials with a homogeneous structure;however,these methods are time-consuming and *** the present work,we reveal a high-throughput experimental strategy to characterize the size-dependent thermal stability via annealing the gradient structured *** this method,the critical size of grain growth(d_(c))at a given annealing temperature was rapidly *** critical size of grain growth was~95 nm when annealed at 503 K for 3 h,which is consistent with the value reported in the homogeneous structured ***,this critical size was found to be identical in three types of gradient structured Ni,i.e.,independent on the gradient *** present work demonstrates a high-throughput strategy for exploring the critical size of grain growth and size-dependent thermal stability of metals.

关键词： High-throughput Gradient structure Critical size Grain growth Thermal stablitiy

Effect of Zener-Hollomon parameter on deformation microstructure in Fe-3%Si alloy

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Acta Metallurgica Sinica(English Letters) 2011年第1期24卷 1-8页

作者： fenghui AN Yuhui SHA Fang ZHANG Liang ZUO Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) Northeastern UniversityShenyang I10819 China

Hot deformation of Fe=3%Si alloy within the temperature range of 1073-1473 K and strain rate range of 0.01-5 s-1 was carried out by compression test. Optical microscopy （OM）, electron backscattered diffraction （EBSD） and transmission electron microscopy （TEM） were used to characterize the deformation microstructure on various scales. Dynamic recovery is the dominant softening mechanism under all experimental conditions. A dynamic recovery region and partial dynamic recrystallization region can be distinguished according to Zener-Hollomon parameter （Z） based on OM observation. Furthermore, the quantitative description of subgrain size and boundary misorientation has been set up as a function of Zener-Hollomon Darameter.

关键词： Fe-3%Si Hot deformation Microstructure Zener-Hollomonparameter

Effects of binary interactions on the color evolution of M33

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Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1505-1509页

作者： KANG XiaoYu ZHANG fenghui ZHANG Yu National Astronomical Observatories Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming 650011 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

In this work, predictions of the spectral energy distribution from populations of single and binary stars are incorporated into a galactic chemical and color evolution model to explore the significance of the effects of the binary interactions on the color evolution of M33. We first constructed a model without binary interactions, and the model is able to reproduce most of the available observational constraints on the distribution of stellar parameters. We then run simulations with the same set of model parameters but with binary interactions considered. By comparing the results for the populations with and without binary interactions, we find that the inclusion of binary interactions makes the surface brightness greater (~0.1 mag arcsec 2) in FUV-band but smaller (~0.7 mag arcsec 2) in K-band, while it results in the FUV K color bluer (~0.8 mag). To reproduce the observations, a model that considers the binary interactions should make more gas fall onto the disk in the early time of the galaxy evolution, or increase the total stellar mass, or both.

关键词： M33 evolution binary stars

Effective Elastic Moduli of Ceramics with Pores

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Journal of Materials Science & Technology 1998年第3期14卷 286-288页

作者： Wang, fenghui Gou, Wenxuan Zheng, Xiulin Lu, Minxu Northwestern Polytech Univ Dept Engn Mech Xian 710072 Peoples R China Northwestern Polytech Univ Dept Mat Sci & Engn Xian 710072 Peoples R China Xian Tubular Goods Res Ctr Xian 710061 Peoples R China

A contribution was given to the theoretical research on the stiffness of ceramic materials, under the approximation of the average stress field, the relation E equals E//0(1 minus p)/(1 plus 2.5p) was derived to describe the dependence of the modulus of elasticity on porosity. The prediction of this model is consistent with the experimental data from several ceramics such as reacting sintered Si//3N//4, MgO and MgAl//2O//3. (Edited author abstract) 12 Refs.

关键词： Ceramic materials

Improving the WRF/urban modeling system in China by developing a national urban dataset

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Geoscience Frontiers 2022年第4期13卷 75-88页

作者： Huidong Li fenghui Yuan Lidu Shen Yage Liu Zhonghua Zheng Xu Zhou CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Lamont-Doherty Earth Observatory of Columbia University PalisadesNY 10964United States National Tibetan Plateau Data Centre Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Accurate modeling of urban climate is essential to predict potential environmental risks in *** datasets,such as urban land use and urban canopy parameters(UCPs),are key input data for urban climate models and largely affect their ***,access to reliable urban datasets is a challenge,especially in fast urbanizing *** this study,we developed a high-resolution national urban dataset in China(NUDC)for the WRF/urban modeling system and evaluated its effect on urban climate ***,an optimization method based on building morphology was proposed to classify urban land use *** key UCPs,including building height and width,street width,surface imperviousness,and anthropogenic heat flux,were calculated for both single-layer Urban Canopy Model(UCM)and multiple-layer Building Energy Parameterization(BEP).The results show that the derived morphological-based urban land use classification could better reflect the urban characteristics,compared to the socioeconomic-function-based *** UCPs varied largely in spatial within and across the *** integration of the developed urban land use and UCPs datasets significantly improved the representation of urban canopy characteristics,contributing to a more accurate modeling of near-surface air temperature,humidity,and wind in urban *** UCM performed better in the modeling of air temperature and humidity,while the BEP performed better in the modeling of wind *** newly developed NUDC can advance the study of urban climate and improve the prediction of potential urban environmental risks in China.

关键词： Urban climate modeling UCM BEP Urban land use Urban canopy parameter Chinese cities