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Variable Universe Fuzzy Control for Battery Equalization

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Journal of Systems Science & Complexity 2018年第1期31卷 325-342页

作者： ZHENG jian chen jian OUYANG Quan The State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University

In order to avoid the overcharge and overdischarge damages, and to improve the lifetime of the lithium-ion batteries, it is essential to keep the cell voltages in a battery pack at the same level,i.e., battery equalization. Based on the bi-directional modified Cuk converter, variable universe fuzzy controllers are proposed to adaptively maintain equalizing currents between cells of a serially connected battery pack in varying conditions. The inputs to the fuzzy controller are the voltage differences and the average voltages of adjacent cell pairs. A large voltage difference requires large equalizing current while adjacent cells both with low/high voltages can only stand small discharge/charge currents. Compared with the conventional fuzzy control method, the proposed method differs in that the universe can shrink or expand as the effects of the input changes. This is important as the input may change in a small range. Simulation results demonstrate that the proposed variable universe fuzzy control method has fast equalization speed and good adaptiveness for varying conditions.

关键词： Cell equalization lithium-ion battery variable universe fuzzy control

Some New Transition Classes in the Fractional Quantum Hall Effect and Their Critical Filling Factors

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Chinese Physics Letters 1996年第3期13卷 215-218页

作者： chen Ying-jian Institute of Scientific and Technical Information of China Beijing 100038

The transitions between fractional quantum Hall states are classified into three equivalence classes by virtue of the matrix *** is pointed out that there probably exist two new transition classes and the critical fil... 详细信息

关键词： theory. transitions Transition

STUDY ON REVENUE SHARING CONTRACT IN VIRTUAL ENTERPRISES

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Journal of Systems Science and Systems Engineering 2006年第1期15卷 95-113页

作者： jian chen jianfeng chen School of Economics and Management Tsinghua University Beijing 100084 China School of Economics and Management Tsinghua University Beijing 100084 China

Member enterprises engaged in a virtual enterprise are prone to shirk both productive efforts; risks because their efforts are unobservable to any other member enterprises. How to design a revenue sharing contract to prevent the member enterprises from free riding is one of the most important issues to be considered to cut down risks that virtual enterprises may meet. Based on the work of profit sharing in partnerships; the research on revenue sharing in supply chains; joint ventures, we propose a model of the revenue sharing contract aimed at coordinating a virtual enterprise composed of n risk-averse member enterprises where every member enterprise performs different tasks; contributes distinct core resources. We characterize the optimal productive efforts, risk-taken; incentive intensity in the revenue sharing contract,; indicate that improving the evaluation precision of productive efforts; selecting weakly risk-averse member enterprises with close power are the key factors to the success of VEs.

关键词： Virtual enterprise revenue sharing productive effort risk aversion incentive intensity

A MULTI-PERIOD PRICING AND INVENTORY CONTROL MODEL

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Journal of Systems Science & Complexity 2010年第2期23卷 249-260页

作者： Juliang ZHANG jian chen Department of Logistics Management School of Economics and Management Beijing Jiaotong UniversityBeijing 100044 China. Department of Management Science and Engineering School of Economics and Management Tsinghua University Beijing 100084 China.

The authors analyze a finite horizon,single product,period review model in which pricingand inventory decisions are made *** in different periods are random variablesthat are independent of each other and their distributions depend on the product *** andordering decisions are made at the beginning of each period and all shortage are *** is a convex function of the amount *** objective is to find an inventory and pricing policymaximizing expected discounted profit over the finite *** authors characterize the structure ofthe optimal combined pricing and inventory strategy for this ***,the authors demonstratehow the profit-to-go function,order up to level,reorder point and optimal price change with respectto state and time.

关键词： Convex cost function planning horizon pricing stochastic inventory management uncertainty.

BACKBONE OF TECHNOLOGY EVOLUTION IN THE MODERN ERA AUTOMOBILE INDUSTRY: AN ANALYSIS BY THE PATENTS CITATION NETWORK

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Journal of Systems Science and Systems Engineering 2011年第4期20卷 416-442页

作者： Yan LIN jian chen Yan chen Department of Management Science and Engineering Dalian Maritime University Dalian 116026 China School of Economics and Management Tsinghua University Beijing 10084 China

In the automobile industry, especially in its modem era, large amount of technologies have been generated to produce automobiles. The technological evolution in this industry is formed by complicated effects of the emergence of some milestone inventions and interaction, integration, and succession among diverse technologies. It＇s a big challenge to sort out crucial inventions and technologies progresses that mainly form this industry＇s technological evolution. We use patent citation data and apply network analytical techniques to reveal characteristics of the ＂backbone＂ in the automobile industry＇s technological evolution. We employ three algorithms respectively to explore the main path of the technological evolution, the most important subnetwork which outlines the main characteristics of the industry＇s technological evolution, and the most important technological inventions （act as authorities and hubs of the technological evolution） in the industry. Main results are reported in detail by tables, figures and interpretations to disclose the most influential technologically developing path, pivotal transfers in technological trajectories, and important technological convergences and divergences over time, of the modem era automobile industry.

关键词： Technology evolution automobile industry patent citation network analysis

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Editorial

Journal of Systems Science and Systems Engineering 2017年第1期26卷 1-2页

作者： jian chen

The Journal of Systems Science and Systems Engineering （JSSSE for short） is created to provide a forum for the manuscripts that address the theories, methodologies and applications relating to systems science and systems engineering. The areas of interest are naturally quite wide. It aims to foster new thinking and research, to help the decision makers understand the mechanism and complexity of economic, engineering, management, social and technological systems, learn the new developments in the theory and practice to improve the performance of systems.

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Advancement on techniques for the separation and maintenance of the red imported fire ant colonies

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Insect Science 2007年第1期14卷 1-4页

作者： jian chen USDA-ARS National Biological Control Laboratory Biological Control of Pests Research Unit Stoneville Minnesota USA

Advancement has recently been made on the techniques for separating and maintaining colonies of red imported fire ants, Solenopsis invicta Buren. A new brood rescue method significantly improved the efficiency in separating colony from mound soil. Furthermore, a new method was developed to separate brood from the colony using fire ant repellants. Finally, a cost-effective method was developed to coat containers with diluted Fluon （AGC Chemicals America, Inc, Moorestown, NJ, USA）, an aqueous polytetrafluoroethylene, to prevent housed ants from escaping a container. Usually the original Fluon solution is directly applied to the wall of the containers. Reduced concentrations of Fhion were found to be equally effective in preventing ant escape. The use of diluted Fluon solutions to coat the containers was recommended because of environmental and cost-saving benefits. Application of these new techniques can significantly reduce labor, cost and environmental contamination. This review paper collates all the new techniques in one reference which readers can use as a manual.

关键词： brood separation Fluon coating Solenopsis invicta Buren

Comparative Analyses of Proteome Complement Between Worker Bee Larvae of High Royal Jelly Producing Bees (A. m. ligustica) and Carniolian Bees (A. m. carnica)

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Agricultural Sciences in China 2009年第10期8卷 1219-1227页

作者： chen jian LI jian-ke Institute of Apicultural Research Chinese Academy of Agricultural Sciences~Key Laboratory of Pollinating Insect Biology Ministry ofAgriculture Beijing 100093 P.R China

This study is to compare the protein composition of the high royal jelly producing bee （A. m. ligustica） with that of Carniolian bee （A. m. carnica） during their worker larval developmental stage. The experiment was carried out by two- dimensional gel electrophoresis. The results showed that significant higher numbers of total proteins （283） were detected in larvae of high royal jelly producing bees （Jelly bee） than those of Carniolian bees （152） on 2-d-old larvae. Among them, 110 proteins were presented on both strains of bee larvae, whereas 173 proteins were specific to larvae of Jelly bees, and 42 proteins were exclusive to Carniolian larvae. However, on the 4th d, a significant higher number of total proteins （290） were detected in larvae of Jelly bees than those of Carniolian bees （240）, 163 proteins resolved to both bee larvae, and 127 proteins were specific to Jelly bees and 77 proteins to Camiolian bees. Until the 6th d, also a significant higher number of total proteins （236） were detected in larvae of Jelly bees than those of Carniolian bees （180）, 132 proteins were constantly expressed in two bee larvae, whereas 104 and 48 proteins are unique to Jelly bee and Carniolian bee larvae, respectively. We tentatively concluded that the metabolic rate and gene expression of Jelly bees larvae is higher than those of Carniolian bees based proteins detected as total proteins and proteins specific to each stage of two strains of bee larvae. Proteins constantly expressed on 3 stages of larval development with some significant differences between two bee strains, and proteins unique to each stage expressed differences in term of quality and quantity, indicating that larval development needed house keeping and specific proteins to regulate its growth at different development phage, but the expression mold is different between two strains of larval development.

关键词： honeybee (Apis mellifera) worker bee larva two-dimensional gel electrophoresis proteome

Evidence of social facilitation and inhibition in digging behavior of red imported fire ants,Solenopsis invicta

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Insect Science 2021年第2期28卷 566-570页

作者： jian chen National Biological Control Laboratory Biological Control of Pests Research UnitUSDA-ARSStonevilleMississippiUSA

Dear Editor:Except during few events in their life cycles,such as nuptial swarm and mass migration,red imported fire ants,Solenopsis invicta Buren,avoid being exposed to the open air by living in a unique nest *** nest provides the colony with a controlled environment and an abundance of foraging tunnels,critical for the survival of an ant colony by reducing the risk of desiccation and predation.

关键词： imported system. behavior