西南交通大学学报

Auxiliary Train Location Technique with Registration Arms of Electrified Railways

MA Yong-qiang, GUO Jin

2005, 18(1): 1-4.

[Abstract](1765)

Abstract:
A train positioning technique was proposed as an auxiliary measure for the train locating system based on balise system and odometer. The technique uses the detected location signal at each registration arm to correct the errors accumulated in the odometer. An inspecting window is used in detection ...

Numerical Calculation for Turbulent Flow around TR Maglev Train

BIHai-qua, LEI Bo, ZHANG Wei-hua

2005, 18(1): 5-8.

[Abstract](1514)

Abstract:
Based on the Navier-Stokes equation of compressible viscosity fluid and thek-εturbulence model, turbulent flow around a TR (Transrapid) maglev train with a speed of 430 km/h was investigated using the finite volume method, and the pressure and velocity distributions of slipstream around the train we...

Comparison of Algorithms for Discontinuity on the Characteristics Curves of Draft Gears

HUANG Yun-hua, LI Fu, FU Mao-hai, BUJi-ling

2005, 18(1): 9-13.

[Abstract](1526)

Abstract:
Four kinds of algorithms dealing with discontinuity on the characteristic curves of draft gears were discussed and compared. They are time method, velocity method, displacement method and force equilibrium method. Their applications were analyzed, and their advantages and disadvantages were compared...

Variable-Air-Volume Air-Conditioning System Based on PID-ANN Decoupling Control Technology

FU Long-hai, LI Meng

2005, 18(1): 13-17.

[Abstract](1538)

Abstract:
A dynamic model for a transducer-electromotor-pressure loop and a fresh air valve-CO2 volume content loop was established in order to eliminate the coupling of each loop in a variable-air- volume (VAV) air-conditioning system and effectively control the system. In addition, decoupling control techno...

Controlling Chaotic Motions of Nonlinear System Using B-Spline Neural Network

LIU Qi-lie, ZHANG Cui-fang, YI Fan

2005, 18(1): 18-21.

[Abstract](1517)

Abstract:
A B-spline neural network was trained to be a neural network chaotic controller to predict the time sequences of chaotic systems and obtain their perturbation signals for control of chaotic systems. The data around the fixed points of unstable periodic orbits were used as input samples to train the ...

New Fuzzy Self-Tuning Genetic Algorithm

FANG Lei, ZHANG Huan-chun, JING Ya-zhi

2005, 18(1): 22-25.

[Abstract](1650)

Abstract:
To overcome the drawback of“early maturing”of the classical genetic algorithm (GA) and improve its global convergency and convergency speed, a new fuzzy self-tuning genetic algorithm was proposed. In the new algorithm, the overall population is divided into several sub- populations and each sub-popu...

Algorithms of Mining Fuzzy Association Rules

GAO Ya, MA Lin, DAI Qi

2005, 18(1): 26-29.

[Abstract](1324)

Abstract:
To raise the mining efficiency of fuzzy association rules, a redundant fuzzy association rule was defined and the redundant properties of strong fuzzy association rules were analyzed. A new algorithm to raise the mining efficiency by removing redundant fuzzy association rules was proposed. In additi...

Controllable Predictive Search Algorithm for Fast Block Motion Estimation

YANG Tian-wu, PENG Qiang, ZHU Chang-qian

2005, 18(1): 30-34.

[Abstract](1127)

Abstract:
Based on the characteristics of the diamond search, the concept of search length was brought forth. A novel controllable predictive cross-square fast search algorithm was proposed through investigating the characters of checking points with different search lengths. The proposed algorithm takes conc...

Real-Time Data Acquisition Method Based on Active Data Sending/Serialport Data Monitoring

HUA Ze-xi, WANG Chang-lin, YIN Zhong-ke, ZHANG Chong

2005, 18(1): 35-38.

[Abstract](1219)

Abstract:
To resolve the real-time problem in data acquisition, a new real-time data acquisition method was proposed. In this method, actively sending data to serialport is created on intelligent equipment and a thread program of serialport monitoring is created based on multithreading technology. Handshake a...

Extension to TTCN-3 Synchronization

SONG Bo, LI Xiu-feng, JIANG Chao-zhe

2005, 18(1): 39-43.

[Abstract](1345)

Abstract:
The shortcomings of present TTCN-3 (the testing and test control notation, version 3) in describing synchronization and the necessity of its extensions were analyzed. A new test frame was introduced. The extensions to TTCN-3 was implemented by analyzing an example and using the concept of semaphore....

Comparison among Methods of Decision Tree Pruning

WEIHong-ning

2005, 18(1): 44-48.

[Abstract](1532)

Abstract:
To select a suitable pruning method in decision tree pruning, four well-known pruning methods were compared in terms of computational complexity, traversal strategy, error estimation and theoretical principle by taking a classification and regression tree as an example. Compared with pessimistic err...

Extension of Search Strategies on Ideal AND/OR Graphs

YANG Ning-xue, GONG Hui

2005, 18(1): 49-52.

[Abstract](1249)

Abstract:
SUB and COM are very important operators frequently used in reasoning network graphs of expert systems. AND and OR are the special cases of SUB and COM. The half scenery search method and the maximum superiority search method developed for searching ideal AND/OR graphs can be extended to searching i...

Coupled Vibration Analysis of X-Style Arch Bridge and Vehicles

SHAN De-shan, LI Qiao

2005, 18(1): 53-58.

[Abstract](1524)

Abstract:
Based on the coupled vibration theory, dynamical models and equations of motion were set up respectively to an X-style arch bridge and vehicles. Vehicles and X-style arch bridge were divided into two vibration subsystems connected by nonlinear contact forces between wheels and tracks, and the iterat...

Analysis of Modal Properties of Cable-Net Structures

ZHENG Jia-shu, YUZhi-xiang

2005, 18(1): 58-63.

[Abstract](1292)

Abstract:
The modal properties of two practical cable-net structures, as examples, were analyzed with the sub-space iteration method to investigate the characteristic of frequency distribution of general cable-net structures and the effects of structural parameters, such as steel cable stiffness, structure ma...

Finite Element Analysis of Shear Lag Effect of Skew Box Girder Bridges

ZHANG Yuan-hai, LI Qiao

2005, 18(1): 64-68.

[Abstract](1557)

Abstract:
The generalized conforming element for thin plate bending and the membrane element for plane stress were combined to obtain a plane shell element to analyze the shear lag effect for continuous skew box girder bridges. Comparison between experimental and computed results proved the effectiveness of t...

Adjustment Function of Tie Bars of Long-Span Arch and Rigid Frame Combination Bridge

WANPeng, ZHENG Kai-feng, LIJie

2005, 18(1): 69-72.

[Abstract](1352)

Abstract:
A three-dimensional FE (finite element) model was established for a long-span arch and rigid frame combination bridge using software SAP2000 in order to solve the problem of interaction induced by tensioning the tie bars of rigid frame and main span and adjust its internal forces and geometry. To me...

Experimental Investigation on Shear Strength Parameters of Jointed Rock Mass

ZHOU Ying-hua, ZHOU De-pei, YANG Tao, FENG Zhi-jun

2005, 18(1): 73-76.

[Abstract](1425)

Abstract:
Laboratory tests were performed on red bed soft rocks. The results show that shear strength parameters from a shear test and a triaxial compressive test are not consistent, and that friction angle changes with a regularity of continuous decreasing from the shear of intact rock to the triaxial compre...

Investigation on Size Effect of Shear Strength of Soil

ZHOUJiang-ping, PENG Xiong-zhi

2005, 18(1): 77-81.

[Abstract](1272)

Abstract:
Based on the micro mechanical feature of materials and the strength theory of fibrous bunchiness, the macro statistical size effect of materials was gained. As an example, the shear strength of specimens from a concrete project with three scales,i.e.,small, medium and big sizes widely adopted in soi...

Multidimensional Game Analysis of Pricing and Inputs of Advertisement and Services

TAN De-qing, HUPei, ZHU Wei

2005, 18(1): 82-84.

[Abstract](1145)

Abstract:
According to the characteristics of competition in market among modern firms, a multidimensional game model for two firms about pricing and the inputs of advertisement and services was established and its equilibrium solution was obtained. The analysis of the equilibrium solution shows that a firm c...

Mining of Common Decision Knowledge of Specialists in Project Evaluation Using Rough Set Theory

LAN Min

2005, 18(1): 85-89.

[Abstract](1466)

Abstract:
The rough set model algorithm based on the decision table was used in project evaluation to acquire common decision knowledge from decisions of many specialists as the criterion and the final result of project evaluation so as to improve the existing evaluation algorithm. With this algorithm, the mo...

Game Analysis of Present System for Determination of Supervisory Prices in China

GUO Han-ding, LIU Ying-zong, HAO Hai

2005, 18(1): 90-93.

[Abstract](1357)

Abstract:
Game process for action tactics between the government and quality supervision organizations was analyzed with principal-agent theory. The analysis of the probabilities under different supervisory efficiencies suggests that the government needs to adjust the supervision policies and design effective...

Capacity Allocation Model for Container Logistics Revenue Management

BUXiang-zhi, HUANG Qing, WUZhen-ye

2005, 18(1): 94-98.

[Abstract](1407)

Abstract:
The framework for studying revenue management in container shipping industry under uncertainty was proposed. A stochastic container slot allocation model was established, and the uncertainty of demands among ports in a sea route was taken into account in the model. The algorithm for solving the mode...

Matter Element Analysis of Competence of Top-Management

TANG Chun-yong, ZHOU Ying

2005, 18(1): 99-103.

[Abstract](1363)

Abstract:
The method of matter element analysis was used to build a model for evaluate competence of top-management in enterprises. It consists of three dimensions: managerial skills, personal traits and interpersonal relationship. A correlation degree was taken as the evaluating index, and a case was present...

Quality Factor of the Resonance Cavity Filled with Dilute Magnetic Material

ZHANG Shuang-wen, GUAN Zheng-tao, LIU Yun-lin

2005, 18(1): 104-107.

[Abstract](1011)

Abstract:
magnetic material; resonance cavity; relative permeability; dielectric loss; quality factor

Application of PML Absorbing Boundary Condition in Numerical Simulation of Pulses Coupling into Slot

YANG Dan, FANG Jian, LIAO Cheng, REN Lang

2005, 18(1): 108-112.

[Abstract](1480)

Abstract:
Finite-difference time-domain method (FDTD) was used to simulate the coupling processes of ultra-wide-band (UWB) electromagnetic pulses into a cavity with a slot, and an anisotropic perfectly matched layer (PML) absorbing medium was inserted to truncate the computational lattices. According to the s...

Asymptotic Theory for Nonlinear Klein-Gordon Equations

JIANG Liang-jun, JIANG Liang-chun

2005, 18(1): 113-117.

[Abstract](964)

Abstract:
The asymptotic theory of Cauchy problems forn-dimensional Klein-Gordon equations was studied with global iterative technique. The well-posedness of the problem and the validity of formal approximations on a long time scalet∈[0,T(ε)), whereεis a small parameter, were proved in a proper Sobolev space.

On the Representation Theorems of Fuzzy Rough Sets

DU Wei-feng, SUN Shi-bao

2005, 18(1): 118-121.

[Abstract](1288)

Abstract:
The upper and lower approximation operators of rough set were defined by dual form. The representation theorems for this kind of fuzzy rough sets were presented using cut set of relative fuzzy relation and fuzzy sets. It is proved that the upper approximation of such fuzzy rough set in a fuzzy appro...

High Productivity Procedures of Flash Welding or Rails Based on Maximum Output Power

LüQi-bing, TAN Ke-li, DAIHong

2005, 18(1): 122-125.

[Abstract](1433)

Abstract:
According to equivalent circuit of the main welding circuit, a mathematic model was derived for maximum output power of theК-type alternative current rail flash butt welding machines. Based on the model, a high efficiency welding procedure was proposed, and the control program was designed. Experime...

Hydrolysis Rate of Solid Waste in Bioreactor Landfill

LI Qi-bin, LIU Dan, OU-YANG Feng

2005, 18(1): 126-130.

[Abstract](1386)

Abstract:
Based on the first-order kinetics, a hydrolysis dynamics model including the influence of temperature was set up for solid waste in bioreactor landfills. The parameters in the dynamics model were determined by simulation experiments and its reliability was verified. The research shows that a high le...

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2005 Vol. 18, No. 1