西南交通大学学报

Integer Coded Differential Evolution Strategy and Application to Microwave Imaging

LIAO Cheng, WEI Tao, CHEN Wei

2007, 20(6): 647-652.

[Abstract](1679)

Abstract:
Integer coding for a differential evolution strategy was proposed.For an optimization problem,the conventional solution space coded with real numbers is discretized into an integer coded space according to a given precision.Solutions were searched in the integer coded space while the fitness is eval...

Text Recovery from EM Leakage of Computers

ZHANG Hongxin, LÜ, Yinghua, HE Pengfei, WANG Haixia

2007, 20(6): 653-658.

[Abstract](1492)

Abstract:
A text receiving and recovery system was designed for EM information leakage from computers.After EM leakage is intercepted by a broad band antenna,band-pass filtered and amplified,the vertical and horizontal synchronization signals are captured by a phase locked loop circuit.The synchronization sig...

Cascade Feature Extraction for Radar Emitter Signals Based on Atomic Decomposition

ZHU Ming, JIN Weidong, HU Laizhao

2007, 20(6): 659-664.

[Abstract](1786)

Abstract:
A cascade feature extraction for radar emitter signals based on atomic decomposition was proposed.Radar emitter signals are decomposed into a linear expansion of atoms by the method of matching pursuit(MP) based on an over-complete dictionary of Gaussian chirplet atoms,and an improved quantum geneti...

Chaotic Particle Swarm Optimization Algorithm Based on the Essence of Particle Swarm

LIN Chuan, FENG Quanyuan

2007, 20(6): 665-669.

[Abstract](1696)

Abstract:
A chaotic particle swarm optimization(CPSO) algorithm based on the essence of PSO was proposed,following an introduction to the studies on the essence of PSO algorithm.The new algorithm uses chaotic search rather than a random number generator to search a promising region.To increase the diversity,t...

Authenticated Group Key Agreement Protocol with Resistance to Leakage of Ephemeral Secret DH Exponents

LI Guomin, HE Dake, LU Xianhui, MA Chunbo

2007, 20(6): 670-674.

[Abstract](1362)

Abstract:
A novel constant-round authenticated group key agreement(AGKA) protocol was proposed to overcome the weakness of the existing common AGKA protocols.The proposed protocol combines the dual exponential challenge-response(DCR) signature and BD structure.It can resist the leakage of ephemeral secret DH ...

Design of Variable Structure Control for Mismatched Uncertain Singular Systems

WANG Cuihong, HUANG Tianmin, BAO Xiaoying

2007, 20(6): 675-679.

[Abstract](1443)

Abstract:
The design problem of variable structure control for a class of linear singular system with unmatched uncertainties in the state matrix was studied.The equivalent restrict decomposition form was established for the singular system with mismatched uncertainties.On the basis of this form,the switching...

Scheme for Naturally Passing Neutral Sections of High Speed Railways

ZHANG Xueyuan, WU Guangning, DENG Mingli, GAO Bo

2007, 20(6): 680-684,690.

[Abstract](1458)

Abstract:
A scheme of naturally passing neutral sections was proposed based on the mechanism of arcing when a train passes the neutral section.In the scheme,a shunt capacitor is connected to both the pantograph and the high voltage winding of the transformer on board.When the locomotive passes the neutral sec...

Chaotic Motion of a Viscoelastic Beam in Time Dependent Temperature Field

LI Yinghui, DU Changcheng, GAO Qing

2007, 20(6): 685-690.

[Abstract](1607)

Abstract:
A nonlinear dynamic model for a viscoelastic beam under a laterally distributed excitation in a time dependent temperature field was derived,which is based on the constitutive description of Kelvin viscoelastic materials,motion equations and strain-displacement relations of a beam with large deflect...

Thermoelastic Flutter of a Two-Dimensional Thin Plate in Supersonic Airflow

CHEN Dalin, YANG Yiren, HU Shaoquan, FAN Chenguang

2007, 20(6): 691-694.

[Abstract](1461)

Abstract:
A nonlinear dynamic model for a two-dimensional thin plate in supersonic or hypersonic airflow was derived using the von-Karman’s geometrical nonlinear strain-displacement relation.In model,the first order piston theory is used to simulate the aerodynamic load.The equations in the model were discret...

Steering Behaviors of Coupled Bogie with Independent Wheels

CHI Maoru, ZHANG Weihua, DAI Huanyun

2007, 20(6): 695-700.

[Abstract](1482)

Abstract:
A new design for coupled bogies with Independent wheels was proposed.Theoretical analysis reveals that the bogies have good radial steering ability on a curved track and restoration ability on a tangent track,indicating a prospect to improve the steering performances of ordinary bogies with independ...

Pre-Process Interface Technique for High Level Process Planning

LI Rong, WANG Jinnuo

2007, 20(6): 701-705.

[Abstract](1527)

Abstract:
Following the principle of concurrent engineering(CE),a prototype system of high level process planning(HLPP) was proposed.The complete design information of parts was taken as the data source of the HLPP.It is necessary to develop efficient pre-processors to acquire the design information and trans...

Experimental Investigation on Vibrating Compaction Characteristic of Crashed Stone

HE Guangjie, XU Guanghui

2007, 20(6): 706-710.

[Abstract](1377)

Abstract:
A dynamic analysis of vibrating compacting of crashed stone was carried out,and structural resistance of crashed stone in the process of vibrating compacting was measured by utilizing a vibrating compaction test system in order to describe the compaction status of crashed stone accurately.The resear...

Finite Element Analysis on Stresses in Slab Track Structures on Soil Subgrade

LUO Zhen, ZHAI Wanming, YAN Hua, YAO Li

2007, 20(6): 711-714,725.

[Abstract](1566)

Abstract:
To analyze the stresses in slab track structures on soil subgrades,a finite element model was derived.The dimensional effects of the reinforced concrete roadbed on the stresses in the track structure was studied.A reduction in the thickness of the reinforced concrete roadbed increases the stresses i...

Flow Resistance Analysis of Submerged Floating Tunnel

WANG Guangdi, ZHOU Xiaojun, GAO Bo

2007, 20(6): 715-719.

[Abstract](1897)

Abstract:
In order to explore the effects of section shape on pressure distribution,flow field around a submerged floating tunnel for four types of cross section was simulated numerically by using the renormalization group k-ε turbulence model of ANSYS program.Flow field and pressure distribution on the surfa...

Creep Model of Rock Subjected to Water Pressure and External Force

WU Xiuyi, LIU Changwu, SHEN Rongxi, YANG Xu

2007, 20(6): 720-725.

[Abstract](1703)

Abstract:
In order to describe the whole process of rock creep and the creep feature of rock subjected to water pressure and external force more exactly,the Burgers model describing the creep feature of rock was modified.A modified Burgers model was set up through paralleling a non-linear adhesion damper and ...

Coupled Vibration Analysis of Bridge Deck and Cable of Long-Span Cable-Stayed Bridge

TAN Changjian, ZHU Bing

2007, 20(6): 726-731.

[Abstract](1804)

Abstract:
To investigate the characteristics of coupled vibration of bridge deck and cable of a long-span cable-stayed bridge,a model for the coupled vibration of bridge deck and cable was established,and then,the effects of the frequency ratio of bridge deck to cable,the inclined angle of cable and the mass ...

New Model for Full Process Analysis of Bearing Behavior of Externally Prestressed Concrete Beams

XU Xun, QIANG Shizhong

2007, 20(6): 732-738.

[Abstract](1589)

Abstract:
Based on FEM(finite element method),a numerical model for an externally prestressed concrete beam was proposed by considering the material and geometrical nonlinearities of this structure in order to investigate its behavior at the ultimate state of bearing capacity.In this model,a grid-section mode...

Evaluation of GPS Baseline Quality Based on Probabilistic Characteristic of Integer Ambiguity

XU Rui, HUANG Dingfa, LI Chenggang, ZHOU Letao

2007, 20(6): 739-742,747.

[Abstract](1394)

Abstract:
To simplify the evaluation of GPS(global positioning system) baseline quality,a closed-form probability density function(PDF) of fixed GPS baseline solution was presented,and the effects of some factors influencing the PDF of fixed GPS baseline solution,such as the integral region of the PDF,the pre...

ANN-Based Prediction of Turning Rate of Traffic Flows at Intersection

LI Ruimin, LU Huapu, SHI Qixin

2007, 20(6): 743-747.

[Abstract](1719)

Abstract:
Based on an improved back-propagation neural network,a predication model for the turning rate of traffic flows at intersections was proposed to predict traffic flows for the signal control of intersections.The corresponding method to determine necessary parameters in this model was given.To improve ...

Vehicle Routing Based on Floating Car Data

LI Hao, LUO Xia, YAO Chen

2007, 20(6): 748-752,757.

[Abstract](1537)

Abstract:
A floating car information collection system was used to predict section travel time so as to realize the routing optimization of mixed traffic with time windows.A model for the routing optimization of mixed traffic with time windows was set up,and algorithms for floating car map matching and sectio...

Prediction of ESAL Based on Rated Carrying Capacity and Enforcement Intensity

HE Jie, LI Xuhong, HANG Wen, MAO Haijun

2007, 20(6): 753-757.

[Abstract](1396)

Abstract:
A GVWD(gross vehicle weight distribution) model for a typical type of trucks under a non-overloading condition was set up.Furthermore,this model was revised based on the enforcement intensity of overloading to gain a GVWD model based on rated carrying capacity limitation and regulation strength.On t...

Optimization Model for Assignment of Wagon Flows in Railway Network

YAN Hexiang, LIANG Dong, ZHANG Tianwei

2007, 20(6): 758-762,780.

[Abstract](1439)

Abstract:
The current mathematical models for wagon flow routing were amended based on analyzing their limitations and considering the wagon flow reorganization so as to choose the route of wagon flows correctly.Three groups of 0-1 variables were set,and models for choosing the route of wagon flows were propo...

Minimal Determining Set and Its Unique Existence under Independent Decisiveness Condition ⅡA（S2）

GUO Chunxiang, LI Xusheng, GUO Yaohuang

2007, 20(6): 763-768.

[Abstract](1169)

Abstract:
The minimal determining set of social choice function and its unique existence condition were investigated under non-binary choice and the condition that independent decisiveness condition ⅡA(S1) becomes independent decisiveness condition ⅡA(S2).It is proven that the unique minimal determining set a...

Quantitative Evaluation Method of Enterprise Cooperation Motivation

LIU Weihua, JI Jianhua

2007, 20(6): 769-774.

[Abstract](1293)

Abstract:
To provide a new approach of research into the cooperation relationship,a quantitative method of calculating enterprise cooperation motivation was put forward based on the balance theory and the expectancy theory.By analyzing the structure of the enterprise cooperation motivation,its calculation pro...

Aid Contract-Based Disruption Management in Supply Chain

SHENG Fangzheng, JI Jianhua

2007, 20(6): 775-780.

[Abstract](1546)

Abstract:
By taking a supply chain consisting of one supplier and one retailer as a research object,an aid contract offered by the retailer was used to coordinate the supply chain when the supplier is disrupted.Based on the time sequence of the disruption,a two-stage model was set up for the disruption.The re...

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2007 Vol. 20, No. 6