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Research on the Group Decision in Manufacturing Chain

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武汉理工大学学报 2006年第S3期28卷 1102-1106页

作者： WEI Shuangying~1 LI Biqiang~2 (1.management school,wuhan university of technology,wuhan 430070,china, 2.management school,wuhan university of technology,wuhan 430070,china) management school Wuhan University of TechnologyWuhan 430070China

The competition in 21st century will be the competition among different manufacturing *** chain makes decision not only the core enterprise of the manufacturing chain but also a group of *** significant decision in manufacturing chain will affect each enterprise in manufacturing chain,thus every significant decision should meet the desire and requests of each enterprise that be *** significant decision should concentrate in the opinion of each member in the rep- resentative assembly or committee and obtain the authorization of the *** vital question also should be discussed,made the decision and coordinated the moves by the representative assembly or the *** society’s development and the technical progress,the knowledge and the information content is growing suddenly,the questions needs making the decision are more and complex,the single enterprise only depended on its own resources and the strength is unable to grasp all essential information,and hard to face all *** representative assembly formed by representatives from each enterprise in manufacturing chain can gather together experts of different knowledge structure and different experience,which make up the deficiency of single enterprise in resources,strength and experience with the aid of many enterprises’resources and the *** is not just increase several brains,but to establish an information complex to ensure the scientific of decision,which formed by different knowledge structure, applies scientific theory method and means,can mutually enlighten and has abundant *** it comes down to the group *** decision questions have two types,one is the collectivity decision which pursue the holistic benefit of the group,the other is that the members in the group pursue its’own benefit and value against others,that means the game theory of interest con- flict existed among the ***,most scholars research the q

关键词： manufacturing chain group decision GDSS

Multiplicity of periodic solutions to Birkhoff's billiard ball problem

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Chinese science Bulletin 1997年第5期42卷 353-355页

作者： Jl MinGraduate school, university of science and technology of china, Beijing 100039, china Graduate school University of Science and Technology of Chine Beijing China

THE motion of a perfectly elastic billiard ball upon a convex billiard table is a highly typical system of dynamical systems. Let Γ be the boundary of a billiard table, strictly convex and C^1 smooth. The ball is assumed to roll on the table. It goes straight until it hits the boundary Γ where the ball bounces off according to the law that the angle of incidence is equal to the angle of reflection. Its path will be a closed n-sided polygon inscribed in Γ having no coincident sides, if and only if the motion is periodic with the positive number n as its minimal period. This is called n-bounce periodic orbit. If an n-bounce periodic orbit makes κ circuits of Γ

关键词： n-bounce stationary point periodic orbit incomplete space perimeter function.

The analyticity of solutions to a class of degenerate elliptic equations

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science china Mathematics 2010年第8期53卷 2061-2068页

作者： LI ChunHe school of Mathematical science,university of Electronic science and technology of china,Chengdu 610054,china 1. school of Mathematical science University of Electronic Science and Technology of China Chengdu 610054 China

In the present paper,the analyticity of solutions to a class of degenerate elliptic equations is obtained.A kind of weighted norms are introduced and under such norms some degenerate elliptic operators are of weak coe... 详细信息

关键词： analyticity degenerate elliptic equations weighted norm weak coerciveness

Prescribing symmetric scalar curvature on S^2

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Chinese science Bulletin 1999年第6期44卷 514-517页

作者： Jl MinGraduate school, university of science and technology of china, Beijing 100039, china Graduate school University of Science and Technology of China Bajing China

The problem of prescribing scalar curvature in S^2 is discussed, and the solvability of the equation - ΔU + 2-Re^U= 0 on S^2, is given, where R ∈ C^0 (S^2). It is known that there are some obstructions. Some new results are given by seeking a solution of the minimax type. For example, supposing that R is G symmetric and is constant on the set of fixed points on S^2 under G ( where G is a subgroup of O (3)), it is proved that the equation is solvable if and only if R is positive somewhere.

关键词： scalar curvature critical point symmetric function minimax solution transformation group.

PROFILE TOLERANCE EVALUATION OF PARAMETRIC CURVES AND SURFACES

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Chinese Journal of Mechanical Engineering 2002年第2期15卷 121-125页

作者： Huang Xiaoping Xiong Youlunschool of Mechanical science and Engineering, Huazhong university of science and technology,wuhan 430074, china school of Mechanical science and Engineering Huazhong University of Science and Technology Wuhan 430074 China ***

The profile error evaluation of complex curves and surfaces expressed inparametric form is considered. The linear error model is established on the base of two hypothesesfirstly. Then the profile error evaluation is converted into one of these optimal formulations:MINIMAX, MAXMIN and MINIDEX problems, which are easier to be solved than the initial form. To eachone of them, geometric condition and algebraic condition are presented to arbitrate whether theideal element reaches to the optimal position. Exchange algorithm is proven highly effective insearching for solutions to these optimization problems. At last some key problems in tolerance offreeform surfaces and curves in B spline method are discussed.

关键词： Parametric form Profile tolerance Linear error model Exchangealgorithm

Attraction and Stability for Neutral Stochastic Functional Differential Equations

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wuhan university Journal of Natural sciences 2009年第3期14卷 205-209页

作者： CEN Liqun, DAI Weixing, HU Shigeng school of Mathematics and Statistics, Huazhong university of science and technology, wuhan 430074, hubei, china school of Mathematics and Statistics Huazhong University of Science and Technology Wuhan Hubei 430074 China

The main aim of this paper is to establish several new criteria on the attractor for the solutions of neutral stochastic func- tional differential equations. A kind of ψ-function is introduced to our discussion, and some results on the attractor for the product of the ψ-function and the solutions are obtained. As a byproduct, a number of new criteria on asymptotic stability are also shown.

关键词： Lyapunov's method attractor semimartingale convergence theorem Ito's formula

Corner occupying theorem for the two-dimensional integral rectangle packing problem

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science china(Information sciences) 2012年第11期55卷 2466-2472页

作者： HUANG WenQi1,YE Tao1 & CHEN DuanBing2 1school of Computer science and technology,Huazhong university of science and technology,wuhan 430074,china 2Web sciences Center,school of Computer science,university of Electronic science and technology of china,Chengdu 611731,china 1. school of Computer science and technology Huazhong University of Science and Technology Wuhan 430074 China2. Web Sciences Center School of Computer Science University of Electronic Science and Technology of China Chengdu 611731 China

This paper proves a corner occupying theorem for the two-dimensional integral rectangle packing problem,stating that if it is possible to orthogonally place n arbitrarily given integral rectangles into an integral rectangular container without overlapping,then we can achieve a feasible packing by successively placing a rectangle onto a bottom-left corner in the *** on this theorem,we might develop e?cient heuristic algorithms for solving the integral rectangle packing *** fact,as a vague conjecture,this theorem has been implicitly mentioned with different appearances by many people for a long time.

关键词： rectangle packing bottom-left corner occupying theorem NP hard

Relationship between Low Temperature Toughness and Microstructure in Low Activation Fe-Cr-Mn(W,V)Steel for Fusion Reactors

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International Journal of Minerals,Metallurgy and Materials 1999年第2期13卷 111-115页

作者： Benfu Hu Chengchang jia(Material science and Engineering school, university of science and technology Beijing, Beijing 100083, china) Material science and Engineering school University of Science and Technology Beijing Beijing 100083 China

Fe-Cr-Mn (W, V) austenite steel was researched in order to supply a theory base for the first wall materials of fusion *** included vacuum melting, forging, annealing, solution treatment, Charpy impact tests and microstructure observation. Theresults show that the imped value decreases with the test temperature decreasing. In this system, there is ductile/brittle transition. Themechanism of this decrease of the impact value is considered to be due to γ - ε transformation in sub-stable austenite steel and stoppingoverlapping sacking fault by grain boundaries in stable austenite steel.

关键词： fusion reactor first wall materials low temperature toughness Fe-Cr-Mn system

Sol-gel Preparation and Infrared Radiation Property of Boron-substituted Cordierite Glass-ceramics

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Journal of Materials science & technology 2010年第5期26卷 445-448页

作者： Shuming Wang and Fenghua Kuang school of Materials science and Engineering,university of science & technology Beijing,Beijing 100083,china [a] school of Materials science and Engineering university of science & technology Beijing Beijing 100083 china

Boron for aluminum substitution in the cordierite structure has been examined by sol-gel preparation of different samples along the compositional junction Mg2Al4-xBxSi5O18 with x=0,0.5,1,*** increasing the x value from 0 to 1.5 the crystallization behavior changed *** amount B2O3 doping can promote the sintering of amorphous cordierite gel,effectively restrain the precipitation of μ-cordierite and enhance the crystallization of α-*** substitution of B3＋ for Al3＋ in cordierite crystal structure can effectively improve the near-infrared spectral emissivity of this cordierite based glass-ceramics.

关键词： Sol-gel Glass-ceramics Infrared radiation B3+ substitution Solid solution