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Frequency/time hopping sequence sets with optimal partial Hamming correlation properties

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Science China(Information Sciences) 2012年第10期55卷 2207-2215页

作者： NIU XianHua 1,2,PENG DaiYuan 1 & ZHOU ZhengChun 3 1 The Provincial Key Laboratory of Information Coding and Transmission,Institute of Mobile Communications,Southwest Jiaotong University,Chengdu 610031,China 2 The School of Mathematics and Computer Engineering,Xihua University,Chengdu 610039,China 3 The College of Maths,Southwest Jiaotong University,Chengdu 610031,China The Provincial Key Laboratory of Information Coding and Transmission Institute of Mobile Communications Southwest Jiaotong University Chengdu China The School of Mathematics and Computer Engineering Xihua University Chengdu China The College of Maths Southwest Jiaotong University Chengdu China

Frequency hopping/time hopping(FH/TH) sequences have found wide applications in various modern FH/TH spread spectrum communications,such as digital cellular mobile communication,short-range wireless communication,personal communication,and multi-user radar,sonar *** order to evaluate the goodness of FH/TH sequences design,the periodic Hamming correlation function is used as an important ***,the length of correlation window is shorter than the period of the chosen FH/TH sequence,so the study of the partial Hamming correlation of FH/TH sequence is particularly *** this paper,a new class of FH/TH sequence sets with good partial Hamming correlation properties is proposed and *** construction of new FH/TH sequence sets is based upon the generalized m-sequence and generalized Gordon-Mills-Welch sequence over a polynomial residue class *** is shown that new FH/TH sequence sets are optimal with respect to the partial Hamming correlation bound.

关键词： frequency hopping/time hopping(FH/TH) sequence partial Hamming correlation optimal FH/TH sequence set

Research on Hardware of Shunt Active Power Filter Based on TMS320F28X

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Research on Hardware of Shunt Active Power Filter Based on T...

第一届国际测量仪器与测试自动化学术会议

作者： Shu Xinmei Zhang Guangyi Wang Lei (Xihua University Chengdu 610039 China)

＜正＞It is significant for active power filter to be applied to resolve harmonics pollution and compensate reactive power. In the paper, the hardware of active power filter is researched, some parameters in main circuit are discussed, a DSP+FPGA control concept is presented. In the concept, a TMS320F28X DSP works as core chip and a FPGA do as aid chip. This design is efficiency proved by experiments.

关键词： Active power filter harmonics DSP FPGA.

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惰性气体输运性质的理论计算

物理学报 2002年第3期51卷 497-500页

作者：郭建军四川工业学院电子信息与电气工程系成都610039

利用惰性气体原子间相互作用势 ,系统计算了 5种惰性气体的输运系数 ,包括第二维里系数B、扩散系数D、热传导系数λ、黏滞系数 η和热扩散因子αT 的计算 .从输运性质的计算证明了Tang Toennies势模型的准确性 .

关键词：惰性气体 Tang-Toennies势模型输运系数理论计算输运性质扩散系数

维普期刊数据库

Application of Fuzzy Sliding Mode Controller in Permanent Magnet Synchronous Motor

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Application of Fuzzy Sliding Mode Controller in Permanent Ma...

四川省电工技术学会第九届学术年会

作者： Chuandong Ding Jun Wang (School of electrical and information of Xihua University Chengdu 610039)

＜正＞Considering the difficulties of parameter identification in fuzzy logic control and chattering in sliding mode variable structure control systems,a method of a fuzzy sliding mode controller which combines the merits of both control theory is proposed to solve the chattering problem in the control *** with sliding mode variable structure control,experimental results show that it has eliminated chartering phenomenon effectively and has better control performances with of anti-perturbation and anti-disturbances.

关键词： Index term-Fuzzy control Sliding mode control Permanent magnet synchronous motor

Effect of rare earths on phase transformation in as-cast ZA27 alloy dur-ing compressive creep

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Rare Metals 2003年第4期22卷 259-264页

作者： WEIXiaowei SHENBaoluo DepamnentofAppliedPhysics UniversityofElectronicScienceandTechnologyofChinaChengdu610045China DeparlanentofMetalScience SichuanUniversityChengdu610065China

The effect of the mixed rare earths of Ce on the phase transformation in ascast ZA 27 alloy during compressive was investigated under 37 MPa and at 160 deg C by X-raydiffraction technique and SEM. The results showed that the as cast microstructure of ZA 27-RE alloyconsisted of a dendritic Al-rich alpha' surrounded by Zn-rich beta' phase, interdendritic epsilonphase and Zn-rich eta phase together with a complex Z phase which was a complex constitute compound,(RE,Cu)Al_5Zn_(16), dispersed in crystal interfaces or branch crystal interfaces and stable duringcompressive creep test at 160 deg C. The phase transformations of ZA 27-RE alloy, decomposition ofbeta' phase arid four transformation, were delayed by the addition of rare earths, also the lamellarstructure and the spheroidized structure in ZA 27-RE alloy were finer than in ZA 27 alloy duringcompressive creep test at 160 deg C at the same creep time, and the compressive creep resistance ofZA 27-RE alloy was higher than that of ZA 27 alloy.

关键词： microstructure change compressive creep rare earths ZA 27 alloy

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Research on Fuzzy Control Strategies for Automotive EPB System with AMESim/Simulink Co-simulation

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Research on Fuzzy Control Strategies for Automotive EPB Syst...

2009中国控制与决策会议

作者： Yi-qiang PENG,Wei LI School of Transportation and Automotive Engineering,Xihua University,Chengdu 610039

＜正＞In order to improve the response performance,the mathematic model of an automotive electrical parking brake（EPB） control system is *** physical model is built with AMESim simulation software and a fuzzy controller for the system is constructed in Matlab/Simulink *** evaluate the performance of the fuzzy controller,a co-simulation method with AMESim/Simulink is *** simulation shows that,the response performance of the EPB control system is much better than the performance of conventional PID controller. Furthermore,the fuzzy controller can be transformed to a look-up table for real time control in actual applications.

关键词： Electrical Parking Brake Fuzzy Control PID Control AMESim/Simulink Co-simulation

Feature Extract Based on Improved Fuzzy Neural Network

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Feature Extract Based on Improved Fuzzy Neural Network

2010 Chinese Control and Decision Conference

作者： Che Chang,Hu Dan School of Mechanical Engineering and Automation,Xihua University,ChengDu,610039

＜正＞By changing the construction of the fuzzy neural network based on wavelet basis function,an improved fuzzy neural network is introduced for feature extraction of fault *** the selection of wavelet base and the orthogonal least-square（OLS） algorithm,an improved fuzzy neural network is described for feature extraction so as to improve the system ***,according to the cutting force sample data,it is proved that this method has fast convergence and excellent optimization feature subset property,reduces the significant over-fitting problem.

关键词： Neural Network Feature Extract Cutting Force Wavelet Function

The Research on the Network Optical Fiber Sensor of the Surface Temperature Measurement for a Large Rotor Based on IEEE1451.2

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The Research on the Network Optical Fiber Sensor of the Surf...

2005国际电机与系统学术会议

作者： Zheng Ping Pan Shiyong Li Yong Xi Hua University Sichuan Chengdu 610039 China

＜正＞ The. optical fiber non-contact measurement of lager generator rotor surface temperature is introduced. The characteristics of a network optical fiber sensor based IEEE1451.2 are discussed. The plan that CAN fieldbus is used as TⅡ（transducer independent interface） to connect STIM and NCAP through long distance is brought forward. The remote online monitor of the lager rotor temperature measurement is implemented.

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Shooting Algorithm of Soccer Robot Based on Bi-arc

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Shooting Algorithm of Soccer Robot Based on Bi-arc

2007年国际电子商务、工程及科学领域的分布式计算和应用学术研讨会

作者： Zaixin Liu, Weibing Zhu, Jinge Wang Research Institute for Robot of Xihua University , Chengdu ,610039, China

To improve the rate of soccer robot shooting a goal, by analyzing shortcoming of basic shooting algorithm。Bi-arcs are used to solve the shooting problem of collision avoidance and holding appropriate position because they meet two end-point and two end-tangent conditions, namely the initial and terminal positions and tangents of mobile robots. The method presented here is simple,effective and computationally undemanding and it has no restraints on the initial conditions of soccer robot.

关键词： Soccer Robot Shoot Bi-arc Moving Path