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Optimality strategy of a sealed-offer simultaneous bargaining protocol

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science china(Information sciences) 2011年第1期54卷 79-90页

作者： ZHANG LinLan1,2.CHEN XueGuang2.& HONG Liu2.1School of Business,Hubei university,wuhan 430062.{2. 2.3} of Systems engineering,huazhong university of science and technology,wuhan 430074,{2. School of Business Hubei University Wuhan China institute of Systems engineering Huazhong University of Science and Technology Wuhan China

Alternating-offer bargaining protocol is the most predominant way for solving bilateral bargaining ***,alternating-offer may consume much time and cause a low effciency in some ***, a deadlock in which both negotiators are unwilling to concede or refuse to disclose more information may arise. Then mediation is *** paper presents an agent-based sealed-offer simultaneous bargaining protocol by introducing a nonbiased *** information of both agents is considered completely *** our agent-based model,both agents simultaneously submit their respective offers to the mediate *** offers of each agent are not revealed to the *** design can discourage counter-speculation and effectively control fraud and misrepresentation in a certain ***,we analyze how an agent can exploit the available information in selecting a strategy that maximizes its expected utility and give the optimal offers of each agent at each stage of the *** groups of automated experiments are conducted to evaluate the performance of the proposed automated negotiation procedure.

关键词： automated negotiation bargaining sealed-bid optimal strategy

CLASSIFICATION OF GEAR FAULTS USING HIGHER-ORDER STATISTICS AND SUPPORT VECTOR MACHINES

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Chinese Journal of Mechanical engineering 2002年第3期15卷 243-247页

作者： Lai Wuxing Zhang Guicai Shi Tielin Yang ShuziSchool of Mechanical science and engineering,{2.,wuhan 430074, china School of Mechanical science and engineering Huazhong University of Science and Technology Wuhan 430074

Gears alternately mesh and detach in driving process, and then workingconditions of gears are alternately changing, so they are easy to be spalled and worn. But becauseof the effect of additive gaussian measurement noises, the signal-to-noises ratio is low; theirfault features are difficult to extract. This study aims to propose an approach of gear faultsclassification, using the cumulants and support vector machines. The cumulants can eliminate theadditive gaussian noises, boost the signal-to-noises ratio. Generalisation of support vectormachines as classifier, which is employed structural risk minimisation principle, is superior tothat of conventional neural networks, which is employed traditional empirical risk minimisationprinciple. Support vector machines as the classifier, and the third and fourth order cumulants asinput, gears faults are successfully recognized. The experimental results show that the method offault classification combining cumulants with support vector machines is very effective.

关键词： Support vector machine Gear Fault diagnosis Cumulant Featureextraction

ON THE ALMOST SURELY ASYMPTOTIC BOUNDS OF A CLASS OF ORNSTEIN-UHLENBECK PROCESSES IN INFINITE DIMENSIONS

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Journal of Systems science & Complexity 2008年第3期21卷 416-426页

作者： Yuhong LI College of Hydropower and Information engineering Huazhong University of Science and Technology Wuhan 430074 China

Given a real-valued separable M-type 2.Banach space X with the p-th power of the norm of C2.class, the almost sure asymptotic upper bounds of the solutions of the Ornstein-Uhlenbeck Processes described by the following equations {dz（t）=A（t,z（t））dt＋σ（t,z（t））dW（t）,z（0）=z0∈X,are investigated. This study generalizes the corresponding well-known finite dimensional results of Lapeyre （1989） and Mao （1992..

关键词： Almost surely asymptotic bounds infinite dimension M-type 2.Banach space Ornstein-Uhlenbeck Processes

DYNAMIC SIMULATION OF ROTATING SHELLS COUPLED WITH LIQUID

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Acta Mechanica Solida Sinica 2001年第2期14卷 169-175页

作者： Wei Fayuan Li Shiqi Huang Yuying~1 Zhong Yifang (College of Mechanical science and engineering,{2., wuhan 430074, china) (1 Department of Mechanics,{2., wuhan 430074,china) Coll. of Mech. Sci. and engineering Huazhong Univ. of Sci. and Technol. Wuhan 430074 China Department of Mechanics Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

The dynamic behaviors of rotating shells coupled with liquid areshown. The shell under con- sideration has arbitrary boundaryconditions and a complex shape. A modified boundary element methodand finite strip technique are used to improve the computingefficiency and to guarantee the continuity conditions on theliquid-shell interaction plane. The effects of various parameterssuch as shell's thickness and liquid depth are investigated. Dynamicsimulations are applied to several typical shell-liquid systems, andthe natu- ral frequencies, mode shapes and response of vibration arecalculated numerically.

关键词： rotting shells dynamic simulation fluid-solid interaction

MICROSTRUCTURE IN laser FUSED HIGH SPEED STEEL W6Mo5Cr4V2.M2.

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Acta Metallurgica Sinica(English Letters) 1993年第1期6卷 36-39页

作者： LIU Ning CUI Kun huazhong university of science and technology,wuhan.{2. DENG Zonggang Hefei university of technology,Hefei,{2. CHENG Benpei KONG Jie institute of Solid State Physics,Academia Sinica,Hefei,{2. Doctorate student,Department of Mechanical engineering No.2.huazhong university of science and technology,wuhan 430074,{2. huazhong Univ of science and Technology Wuhan China

Microstructure of the deepest zone of high speed steel W6Mo5Cr4V2.M2.melt after laser fu-sion was found to be so fine as the ehill zone of a solidified *** narrower chill zoneformed,the long columnar dendrites grow into the melt and then the fine equiaxed cellularstructure appears in upper melt region nearly *** substructure of cellular grains anddendrites was observed to consist of martensite and retained austenile,while the carbides asM_6C_■ Cr_7C_3 and MC distributed at their *** is believed that the highermicrohardness up to HV_(0.1)=865-960 of the laser fused structure of the alloy is due to the oc-currence of martensite.

关键词： High speed steel W6Mo5Cr4V2.M2. laser fused treatment micrstructure

Investigation on Self-Q-Switched Er3+-Doped Fiber lasers

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Chinese Journal of lasers 1995年第3期B4卷 211-216页

作者： SUN Junqiang HUANG Dexiu(Department of Optoelectronic engineeringhuazhong {2. of science and technology, wuhan 430074, china)LI Zaiguang(National Laboratory of laser technology, wuhan 430074, china) huazhong Univ of science and Technology Wuhan China

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关键词： changeable nonlinear refraction index self-Q-switching

Numerical simulation of the transient multiphase field during plasma deposition manufacturing composite materials

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science china(Physics,Mechanics & Astronomy) 2009年第4期52卷 508-517页

作者： KONG FanRong1,2.ZHANG HaiOu1 & WANG GuiLan3 1 State Key Laboratory of Digital Manufacturing Equipment and technology,huazhong {2. of science and technology,wuhan 430074,china 2.Research Center for Advanced Manufacturing,Southern Methodist {2.,3101 Dyer Street,Dallas,Texas 752.5,USA 3 College of Material science and engineering,huazhong {2. of science and technology,wuhan 430074,china State Key Laboratory of Digital Manufacturing Equipment and technology Huazhong University of Science and Technology Wuhan China Research Center for Advanced Manufacturing Southern Methodist University Dallas USA College of Material science and engineering Huazhong University of Science and Technology Wuhan China

A solid/liquid/gas unified model has been developed to investigate the gradient composition formation during the plasma deposition manufacturing(PDM) composite materials process. In this model,an enthalpy porosity model was applied to deal with the melting and solidification of the deposited layer,and a level-set approach was introduced to track the evolution of the free surface of the molten pool and the deposited layer. Moreover,complicated physical phenomena occurring at the liquid/gas interface,including forced convection heat loss,heat emission and plasma heat source,have been incorporated into the governing equations by source terms. In this study,the numerical experiment of nickel base alloy powder deposited on the medium steel substrate by PDM technique was implemented based on the staggered grid and SIMPLEC algorithm. Concentration gradient distribution of the solute material at the composite material interface,fluid flow and temperature distribution in the molten pool and the deposited layer have been investigated in detail.

关键词： plasma deposition manufacturing composite material solid/liquid/gas unified model level-set approach

YIELD CRITERION IN PLASTIC-DAMAGE MODELS FOR CONCRETE

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Acta Mechanica Solida Sinica 2010年第3期23卷 220-230页

作者： Ji Zhang Zhongxian Zhang~★Chuanyao Chen (School of Civil engineering and Mechanics,huazhong {2. of science and technology, wuhan 430074,china) School of Civil engineering and Mechanics Huazhong University of Science and Technology Wuhan China

A class of plastic-damage models for concrete require an unambiguous definition of cohesion in the yield criteria. For this reason, the Lubliner yield criterion has been adopted by many investigators and the commercial FE program Abaqus. As is well known, this criterion has achieved great success especially in plane stress states. In this paper, we are trying to extend it to triaxial compression stress states. First, a major limitation of the Lubliner criterion is analyzed. Then, a revised version of the Lubliner criterion is proposed, which shows appropriate properties over a wide range of stress states often encountered in engineering structures, and the predicted failure envelopes fit well with experimental data. For the concrete damaged plasticity model in Abaqus, a calibration strategy is suggested for uniformly confined concrete.

关键词： plastic-damage model Lubliner yield criterion triaxial compression concrete damaged plasticity

Early Age Compressive Strength of Pastes by Electrical Resistivity Method and Maturity Method

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Journal of wuhan university of {2.(Materials science) 2011年第5期26卷 983-989页

作者：肖莲珍 School of Materials science and engineering Wuhan Institute of Technology

The compressive strength development of Portland cement pastes was investigated by the electrical resistivity method and the maturity *** experiments were carried out on the cement pastes with different water-cement ratios at different curing *** results show that the application of the maturity method has limitation to obtain the *** is found that both of the compressive strength and the electrical resistivity follow hyperbolic trend for all the *** hyperbolic equation of each mix is obtained to estimate the ultimate resistivity value which can probably be *** relationship between electrical resistivity and compressive strength of the cement pastes is established based on the test results and interpreted by the empirical Archie equation and a strength-porosity *** relationship between the electrical resistivity after temperature correction and the compressive strength was linear and independent of curing temperature and water-cement ratio.

关键词： electrical resistivity cement hydration compressive strength maturity method