西南交通大学学报

Packet-Based Call Admission Control Scheme in Broadband CDMA Networks

FANG Xuming, ZHU Longjie, ZHANG Dandan

2007, 20(1): 1-7.

[Abstract](1327)

Abstract:
A cooperative CAC(call admission control) mechanism for user connection access control and user packet access control,and an improved priority-based CAC scheme were proposed,in which modeling for three major types of traffic,i.e.voice,video and data,were elaborated for application in broadband CDMA(...

Nonrepudiable Threshold Proxy Signature Scheme Based on Elliptic Curve Cryptography

YUAN Ding, FAN Pingzhi

2007, 20(1): 8-12.

[Abstract](1440)

Abstract:
An improved threshold proxy signature scheme was proposed to overcome the defects of the existing scheme that it can not resist conspiracy attacks and forgery attacks from the signers,and is not practical in some applications.In the signing process,every actual signer is required to put in his priva...

Feature Vector-Based Nude Picture Detection

PENG Qiang, ZHANG Xiaofei

2007, 20(1): 13-18.

[Abstract](1486)

Abstract:
To overcome the shortcomings in the existing nude picture filtering systems and image recognition techniques,a feature vector-based nude picture detection algorithm was proposed.In the algorithm,chrominance value of the YIQ color coordinate and hue value of the YUV color coordinate were taken to bui...

Image Sparse Decomposition Based on Quantum Genetic Algorithm

LI Hengjian, YIN Zhongke, WANG Jianying

2007, 20(1): 19-23.

[Abstract](1773)

Abstract:
Based on the quantum genetic!algorithm(QGA)and the matching pursuit(MP),a fast image sparse decomposition algorithm was put forward to reduce the amount of calculation.QGA combining the genetic algorithm and the quantum information theory has a large search space with small population and a good glo...

Color Calibration Based on KPCA and ANFIS

DING Errui, ZENG Ping, WANG Yifeng

2007, 20(1): 24-28.

[Abstract](1340)

Abstract:
An algorithm for color calibration was proposed by integrating an ANFIS(adaptive-network-based fuzzy inference system) with KPCA(kernel principal component analysis).The algorithm maps the input data into a higher dimensional feature space with a kernel function first,then extracts principal compone...

Output Feedback Control for Distributed Network Control System

ZHANG Xiang, XIAO Jian

2007, 20(1): 29-34.

[Abstract](1449)

Abstract:
A mathematical model was proposed for a linear distributed network control system with delays in forward and feedback channels,and it was used to transform the system into a linear system with time-varying delays in state and control input.A robust H-infinity control scheme of output feedback based ...

Influences of Planar Pattern on Performances of RFIC Spiral Inductors

XIAO Huaqing, XIONG Xiangzheng, LIAO Cheng

2007, 20(1): 35-39.

[Abstract](1578)

Abstract:
The performances of RF(radio frequency) integrated circuit(RFIC) spiral inductors on silicon(SIOS) with different planar structures were simulated based on a typical physical model using the HFSS(high frequency structure simulator).The simulated results are well coincident with those from theoretica...

UWB Antenna Optimization Using Micro-genetic Algorithm

QIN Yanmimg, LIAO Cheng, WEI Tao

2007, 20(1): 40-43.

[Abstract](1713)

Abstract:
To meet different designing requirements and improve the efficiency of antenna design,a new method,finite-difference time-domain method(FDTD) combined with a micro-genetic algorithm(MGA),was proposed for design of ultra-wide band(UWB) antennae.An analysis shows that MGA makes an optimization converg...

Accurate Nonlinear Analysis of Tower and Cable in Construction of Main Cable for Suspension Bridge

CHEN Changsong, SU Long, YAN Donghuang

2007, 20(1): 44-48.

[Abstract](1782)

Abstract:
To analyze the deformation og main cable of a suspension bridge accurately,changes in the deformation of main cable shape and force action on tower in the construction were analyzed based on the principle of multi-span catenary of main cable.Action of tower on cable saddle was simulated as a nonline...

Fatigue Test of Tensile Anchor Plates in Cable-Beam Anchorage Zones for Zhanjiang Gulf Bridge

REN Weiping, QIANG Shizhong, WEI Xing, WANG Chunhan

2007, 20(1): 49-54.

[Abstract](1608)

Abstract:
In order to assess the fatigue performance of the key connection details of tensile anchor plates in cable-beam anchorage zones,a full-scale model fatigue test of the tensile anchor plates of Zhanjiang gulf bridge was conducted.ANSYS,a finite element software,was used to analyze the structural behav...

Fast Algorithm for Stationary Stochastic Response Subjected to Multi-component Multi-support Seismic Excitation

ZHAO Canhui, ZHOU Zhixiang

2007, 20(1): 55-60.

[Abstract](1638)

Abstract:
To calculate the stationary stochastic response of a long-span bridge subjected to multi-component and multi-support seismic excitation,a pseudo-excitation method was proposed based on the single-component pseudo-excitation method.Theoretic analyses show that this pseudo-excitation method has the sa...

Primary Resonance of Thin Rectangular Plate with Material Nonlinearity on Winkler Foundation

YANG Zhian, HAN Yanbin

2007, 20(1): 61-65.

[Abstract](1465)

Abstract:
Based on the elastic theory,nonlinear dynamical equations for an externally excited thin rectangular plate on the Winkler foundation were established by considering meterial nonlinearity in order to investigate its nonlinear vibration,and the corresponding nonlinear vibration equation was obtained u...

Change in Microstructure of Salty Soil during Crystallization

WANG Chunlei, JIANG Chongxi, XIE Qiang, FENG Tao

2007, 20(1): 66-69.

[Abstract](1349)

Abstract:
The microstructure of salty soil was investigated by using environmental scanning electron microscopy and X-ray energy-dispersion spectroscopy(EDX),and the effects of crystallization on strength of salty soil was discussed to open out mechanism of the effect.In addition,the effects of change in the ...

Effect of Nano-SiO2 on Performance of Concrete in Dissolving/Crystalling Cycles of Salts

LI Guhua, GAO Bo

2007, 20(1): 70-74.

[Abstract](1320)

Abstract:
To improve the performances of concrete in sea water or soil with inorganic salts,the performance of concrete with nano-SiO2 in dissolving/crystalling cycle of salts was investigated by the experiment of concrete strength,and the microstructure of concrete was analyzed with SEM(scanning electron mic...

Kinematic Orbit Determination of Low-Earth Orbiters Based on GPS Precise Point Positioning Technique

HAN Baomin, YANG Yuanxi

2007, 20(1): 75-79.

[Abstract](1458)

Abstract:
In order to advance orbiting results obtained using the present kinematic orbit determination method,the principle and mathematic model of kinematic orbit determination based on GPS PPP(precise point positioning) technique considering dynamic information on a low-earth-orbiter(LEO) were analyzed.By ...

Architecture of Collaborative Design System

LI Bailin, HE Gang

2007, 20(1): 80-83.

[Abstract](1564)

Abstract:
To develop a model for building a collaborative design system to meet the requirment of enterprises,the characteristics of collaborative design and the requirement of enterprises for collaborative design were analyzed,and the architecture of a collaborative design system was researched from three hi...

Improvement of Dynamic Performance of Speed-Raising Locomotive with Motor Mounted on Frame

MA Weihua, LUO Shihui, SONG Rongrong

2007, 20(1): 84-88.

[Abstract](1577)

Abstract:
To improve the lateral dynamic performance of a speed-raising locomotive running at a high speed,the lateral stability,ride index,lateral wheelset force and change in wheel load for a traction motor respectively elastically and rigidly mounted on the frame were compared and investigated based on ana...

Bending Vibration Analysis of Composite Transmission Shaft

XU Zhaotang, ZHU Rupeng

2007, 20(1): 89-93.

[Abstract](1532)

Abstract:
To improve the dynamic characteristics of a helicopter transmission shaft,bending vibration of a composite transmission shaft was investigated under a non-inertial system.Based on theorem of the motion for center of mass,a bending vibration equation for a tilting fiber composite transmission shaft w...

Particle Swarm Optimization Algorithm for Topological Optimization of Truss Structures

YUAN Dailin, CHEN Qiu

2007, 20(1): 94-98.

[Abstract](1620)

Abstract:
To solve the problem of topological optimization of truss structures with stress and displacement constraints,particle swarm optimization(PSO) algorithm was adopted.With this method,the penalty function approach is applied to turn the constrained optimization problem to a no-constrained optimization...

Constitutive Model for Cyclic Softening Behavior of 45 Steel under Uniaxial Cyclic Straining

LUO Yan, YANG Xianjie, GAO Qing

2007, 20(1): 99-103.

[Abstract](1428)

Abstract:
In order to describe the cyclic softening behavior of materials more exactly,a cyclic plastic constitutive model was proposed based on the deformation character of quenched-tempered 45 carbon steel under symmetrical and unsymmetrical cyclic loadings.In this model,strain softening after the upper yie...

Multi-level Fuzzy Evaluation Method for Civil Aviation System Safety

MA Guozhong, MI Wenyong, LIU Xiaodong

2007, 20(1): 104-109.

[Abstract](2127)

Abstract:
An index system was proposed for safety assessment of civil aviation systems.Fuzzy comprehensive evaluation method was used to calculate the safety degrees corresponding to management and to the human-machine-environment system composed of flight,support and maintenance subsystems.The comprehensive ...

Modeling Method for Road Guide Signs Based on Intersection Features

HUANG Min, YU Zhi, ZHANG Xiaolan

2007, 20(1): 110-114.

[Abstract](1307)

Abstract:
The content of road guide signs was categorized into guide sign items,which were further classified into 3 categories: state signs,connection signs and direction signs.The state function set for the guide sign items was defined based on the road network topology.The key of road guide sign modeling i...

Travel Time Reliability Based Traffic Assignment Model with Multiple User Classes

CHEN Jianlin, LIU Haixu, CHENG Xueqing, PU Yun

2007, 20(1): 115-119.

[Abstract](1662)

Abstract:
The uncertainty in travel time caused by stochastic factors was analyzed.It was assumed that a traveler’s decision on route choice is a tradeoff between expected travel time and travel time reliability.The route choice behaviors were grouped into different classes according to travelers’ attitudes t...

Cooperation Intensity of Enterprises in Supply Chain

LIU Weihua, JI Jianhua

2007, 20(1): 120-124.

[Abstract](1387)

Abstract:
A new concept,cooperation intensity between enterprises in a supply chain,was proposed.Its two main influencing factors are enterprise competence and cooperation resistance coefficient.The method to calculate the cooperation resistance coefficient was proposed on the assumption that the cooperation ...

Positive Region Deduction of Decision Table and Computation of Core

QIN Keyun, GAO Yan

2007, 20(1): 125-128.

[Abstract](1352)

Abstract:
The problems of positive region reduction of decision table and computation of core were investigated so as to reduce the complexity of computation.The discernibility condition about decision objects was constructed,and the relationship between the positive region reduction and the set of discernibi...

Determination of Multielement in Industrial Wastewater Using Artifical Neural Network and Spectrophotometry

GUAN Di, XIE Qinglan, WANG Jiming, ZHANG Yanyan

2007, 20(1): 129-132.

[Abstract](1480)

Abstract:
In order to quickly test two groups of elements with overlapping absorption spectrum,Cd and Co,and Cr and Fe,in industrial wastewater,a novel method was proposed.With this method,the contents of the two elements in each of the two grounds can be tested synchronously and they need not to be separated...

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2007 Vol. 20, No. 1