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A new method for simulating human emotions

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Journal of university of Science and Technology beijing 2003年第2期10卷 72-74页

作者： Weimin Xue, Zhiliang Wang, Wenhong Xia, and Wenbo MengInformation engineering school, university of Science and Technology beijing, beijing 100083, china Information engineering school University of Science and Technology Beijing Beijing 100083 China

How to make machines express emotions would be instrumental in establishing acompletely new paradigm for man machine interaction. A new method for simulating and assessingartificial psychology has been developed for the research of the emotion robot. The human psychologyactivity is regarded as a Markov process. An emotion space and psychology model is constructedbased on Markov process. The conception of emotion entropy is presented to assess the artificialemotion complexity. The simulating results play up to human psychology activity. This model can alsobe applied to consumer-friendly human-computer interfaces, and interactive video etc.

关键词： emotion robot psychology entropy Markov model artificial psychology

Metal deformation in skew rolling step-shaft

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Journal of university of Science and Technology beijing 2003年第5期10卷 59-63页

作者： Yongqiang Kang, Jinping Liu, Cuiping Yang, and Zhenghuan Humechanical engineering school, university of Science and Technology beijing, beijing 100083, china Mech. Eng. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The process of rolling step-shaft was simulated with the help of the FEM(Finite-Element Model) software-DEFORM^(TM) 3D. The characteristics of metal flow in differentperiods were analyzed, and the curve of variety in non-round area at different cross-sections of therolled piece, the curve of variety in bulge volume and the curve of variety in non-column volumewere obtained. On this base the method of tool design is worked out and validated by experiment.

关键词： skew rolling FEM metal deformation non-column volume bulge volume

Distributed GIS oriented generalized image pyramid and its practice

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Science china(Technological Sciences) 2010年第S1期53卷 99-104页

作者： XIA YuBin,PANG PeiYu & WENG JingNong school of Computer Science and engineering,beihang university,beijing 100191,china 1. school of Computer Science and engineering Beihang University Beijing 100191 China

Gaussian pyramid framework (GPF) and Laplacian pyramid framework (LPF) are the two main frameworks used for transmission and structure of spatial image and geometric *** is the main approach for progressive transmission of spatial image *** paper discusses the issues in structure,transmission and storage efficiency of spatial data in the current spatially distributed visualization *** in the paper a novel approach is introduced to structure and store spatial data based on the *** new approach builds (spatial) index for transformed frequency data within different ranges based on splitting high-frequency and low-frequency data by biorthogonal *** approach decreases the storage consumption and network data traffic for transmission while enables the progressive transmission of spatial image.

关键词： redundancy spatial index progressive transmission generalized pyramid structure Laplacian pyramid framework

SEM in-situ Fatigue Observation on Crack Initiation and Growth from Inclusion in P/M Rene95 Superalloy

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Journal of university of Science and Technology beijing 2001年第3期8卷 195-197页

作者： Lina Zhang, Jianxin Dong, Xishan Xie Material Science and engineering school, university of Science and Technology beijing, beijing 100083, china Univ Sci & Technol beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

A special designed experiment was conducted for observing crack initiation and growth in P/M Rene95 superalloy under tension-tension loading by self-made SEM in-situ fatigue loading stag. Several alumina inclusion particles exposed at the specimen surface were observed carefully. During fatigue test inclusions led to cracks initiation. The cracks can be formed by two mechanisms. Generally, the cracks nucleated at the interface between inclusion and matrix. Sometimes, cracks were also formed inside the inclusion. As the increase of cycles, some cracks at the interface between inclusion and matrix broadened and propagated along the direction about 45 degrees to the loading axis. On the other hand, the cracks inside the inclusion propagated in the inclusion and towards matrix.

关键词： inclusion P/M superalloy LCF SEM in-situ fatigue

Fabrication of pure copper rods containing continuous columnar crystals by continuous unidirectional solidification technology

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Journal of university of Science and Technology beijing 2004年第3期11卷 240-244页

作者： Hong zhang Jianxin Xie Zidong Wang Materials Science and engineering school, university of Science and Technology beijing, beijing 100083, china Mat. Sci. and Eng. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Pure copper rods containing continuous columnar crystals were fabricatedusing the downward CUS (Continuous Unidirectional Solidification) equipment. When the technologicalparameters were set as the ranges of mould temperature 1100-1300℃, cooling distance (the distancefrom the exit of the cast mould to the start point of cooling) 10-20 mm, casting speed 0.2-2.5 mm/s,cooling water (20-25℃) volume 1000-1320 L/h, and when these parameters matched reasonably, the CUSprocess was performed stably, and pure copper rods containing continuous columnar crystals withbright and smooth surface were produced. The dendritic arm spacing of the crystals in copper rodsdecreased with increasing the casting speed. The results of the texture by X-ray diffractionanalysis showed that the rods has strong fiber texture.

关键词： copper continuous unidirectional solidification mould temperature castingspeed microstructure texture

Electrochemical Studies of Lithium Intercalation into Graphite Film Electrode for Li^+-ion Batteries

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International Journal of Minerals,Metallurgy and Materials 2000年第1期14卷 48-50页

作者： Chuangang Lin Weihua Qiu Qingguo Liu 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

To study the electrochemical kinetic properties of the Li/Graphite system, cycle voltammerty (CV), ac-impedance and chro- noamperometry (CA) techniques have been used. The results showed that the diffusion of lithium ions in Li_xC_6 is the rate-determining step. The chemical diffusion coefficients of lithium (D_Li) have been estimated for different x values. As for the same material, the value of D_Li was calculated in order to compare the differences among the three techniques.

关键词： electrochemical studies graphite Li^+-ion batteries

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灵巧手操作的重构规划

机器人 2004年第5期26卷 439-443页

作者：杨洋北京航空航天大学机械工程与自动化学院北京100083

根据人类利用滑动或滚动方式进行灵巧操作的几种模式 ,在多指灵巧手—物体的抓持系统中 ,把实现这些灵巧操作模式的规划问题作为一个位形空间的重构问题进行全局和局部级的操作规划 ,开发了实现灵巧操作的规划算法 .仿真结果表明了方法... 详细信息

根据人类利用滑动或滚动方式进行灵巧操作的几种模式 ,在多指灵巧手—物体的抓持系统中 ,把实现这些灵巧操作模式的规划问题作为一个位形空间的重构问题进行全局和局部级的操作规划 ,开发了实现灵巧操作的规划算法 .仿真结果表明了方法的有效性和正确性 .

关键词：灵巧操作多指手操作规划位形重构

Least trace extended set-membership filter

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Science china(Information Sciences) 2010年第2期53卷 258-270页

作者： HUANG Yi , CHEN ZongJi & WEI Chen National Key Laboratory of Science and Technology on Integrated Control Technology, school of automation Science and Electric engineering, beihang university, beijing 100083, china 1. National Key Laboratory of Science and Technology on Integrated Control Technology School of Automation Science and Electric Engineering Beihang University Beijing 100083 China

To improve the consistency of estimation result, a least-trace extended set-membership filter (LTESMF) is presented for a class of nonlinear stochastic systems, which has linear output and unknown- but-bounded noise. Feedback technique is used instead of the intersection of ellipsoid-sets in the measurement update. The feedback parameter is optimized in order to minimize the trace of error bounded ellipsoid’s envelop matrix. A new stability analysis method was developed to prove the stochastic system’s stability by using the convergence of some measurement of the error bounded ellipsoid. Analysis result shows that the estimation error of LTESMF will converge to a bounded area. A simulation of SINS/GPS integrated alignment with large misalignment angles is conducted. The results demonstrate that the convergence speed and the consistency of LTESMF are much better than those of extended Kalman filter (EKF), in addition the steady estimation precision and computational complexity are close to that of EKF.

关键词： set-membership estimation nonlinear system convergence upper bound least trace stability analysis

Statistical approach to weak signal detection and estimation using Duffing chaotic oscillators

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Science china(Information Sciences) 2011年第11期54卷 2324-2337页

作者： JIN Tian & ZHANG Hua school of Electronic Information engineering,beihang university,beijing 100191,china 1. school of Electronic Information engineering BeiHang University Beijing 100191 China

In this paper,we describe the statistical characteristics of weak signal detection by a chaotic Duffing oscillator,and present a new method for signal detection and estimation using the largest Lyapunov *** research has shown that weak signals can be detected by a chaotic *** researchers use the Lyapunov exponent to flag the detection of a chaotic state,but our research shows that the Lyapunov exponent follows statistical characteristics,and therefore more factors should be considered in flagging chaotic weak ***,we analyze the statistical characteristics inherent in the Lyapunov exponent calculation steps,and build up a statistical model for different chaotic states based on simulation ***,we provide expressions for false-alarm and detection probabilities,selection of driving force threshold and detection of ***,we summarize the method of signal amplitude *** research indicates that the performance of the detection system is related to sampling times and intervals,in accord with the theory of statistical signal detection.

关键词： weak signal detection Lyapunov exponent chaos Duffing oscillation statistical signal process