西南交通大学学报

Multiple Criteria Decision-Making Based on Similarity Degree Between Partial Orders

GUO Yao-huang, GUO Chun-xiang, GUO Qiang

2006, 19(1): 1-6.

[Abstract](1289)

Abstract:
A method of multiple criteria decision-making based on similarity degree between partial orders was proposed to solve the problem,in which decision makers provide only with ordinal information about the alternative shemes.The similarity degree is defined by utilizing fuzzy similarity relation.The tw...

Complex Response of an Airfoil-Store System with Structural Non-Linearity

YANG Yi-ren, LIU Fei

2006, 19(1): 7-10,24.

[Abstract](1336)

Abstract:
The mathematic model of an airfoil-store system was simplified with the equivalent linearization method for aeroelasticity system.The parametric areas,in which there were complex flutter in the system,were obtained by introducing the subharmonic bifurcation condition of a symmetric piecewise linear ...

Control of Chaotic Motion of a Planar 2R Robot

LIU Zhao-hui, LI Li

2006, 19(1): 11-14.

[Abstract](1423)

Abstract:
The chaotic motion of a planar 2R robot was suppressed efficiently by applying periodic perturbation.The frequency and the amplitude of the applied periodic signal are two key parameters in the periodic perturbation control.The proper frequency and the amplitude of the periodic signal are obtained b...

Numerical Simulation of Temperature Field in Process of Casting Solidification

ZHAO Xin, WEN Ze-feng, JIN Xue-song

2006, 19(1): 15-19.

[Abstract](1692)

Abstract:
In order to obtain the variation law of temperature during casting solidification to improve casting quality,a finite element method combining with a finite difference method was used to discretize time and space variables in the governing equations of astable heat-conduction in the process of casti...

Diesel Oil Sorption Behaviours of Plant Charcoals

DAI Guang-ze, CHEN De-ke, NI Qing-qing, LUO Yu, LIU Ze-sheng

2006, 19(1): 20-24.

[Abstract](1269)

Abstract:
Diesel oil sorption behaviours were investigated experimentally on three kinds of plant charcoals including carbonized corn,cole and bamboo stalks.All the materials under investigation show some ability of diesel oil sorption,with the carbonized corn stalks being the best.Scanning electron microscop...

Application of Support Vector Machine to Radar Emitter Signal Recognition

ZHANG Ge-xiang, RONG Hai-na, JIN Wei-dong

2006, 19(1): 25-30.

[Abstract](1511)

Abstract:
To enhance the ability of electronic warfare equipment to recognize signals,resemblance coefficient method was proposed to extract features from radar emitter signals,and support vector machine(SVM) was introduced to identify different signals automatically.Resemblance coefficient features have good...

Current Detection Control of Active Power Filter under Non-Ideal Voltage Source

CHEN Wei-rong, TANG Lei

2006, 19(1): 31-36.

[Abstract](1388)

Abstract:
In the ip-iq current detection method of active power filter(APF), the factors influencing detection precision were analyzed.These factors include the low pass filter(LPF) and phase locked loop(PLL).To eliminate the PLL error of non-ideal voltage source,an improved ip-iq current detection method was...

Slip of Induction Motor with Frequency Speed Control

CAO Yu-quan, YAN Li-mei, LI Meng-da, YAN Wei-zhong

2006, 19(1): 37-41.

[Abstract](1371)

Abstract:
Based on the torque-speed characteristic curve of induction motors,analyses were done on changes in slip with an variation in frequency when an induction motor drives different kinds of loads,including those with constant torque,constant-maximum torque,variable torque(except fans and pumps) and cons...

Propagation Characteristics of Circular Coaxial Cables Filled with Multilayered Homogeneous Media and a Radial Conductor Plate

XIONG Tian-xin, YANG Ru-gui

2006, 19(1): 42-47.

[Abstract](1391)

Abstract:
By using the method of separation of variables,a recursive formula was derived for the electromagnetic fields in a circular coaxial cable with a radial conductor plate and filled with multilayered homogeneous isotropic media,and the relationship between the first and the Nth layers of the electromag...

Background Extraction Method Based on Block Histogram Analysis for Video Images

PENG Qiang, LI Hua

2006, 19(1): 48-53.

[Abstract](1369)

Abstract:
A novel method of histogram analysis for background extraction of video images was proposed,which was derived from the pixel-based histogram analysis.The method make full use of the statistical properties of pixels between temporal frames and the correlation of local pixels in a single frame.When ca...

Key Technologies of L2 VPN Based on MPLS

XU Zhi-gen, SHEN Xiao-feng, DU Li-ping

2006, 19(1): 54-57,62.

[Abstract](1000)

Abstract:
The disadvantages of traditional VPN (virtual private network) and the advantages of MPLS L2 VPN(layer 2 VPN based on multiple protocol label switch) were discussed.Data forwarding and the control are the two probelems to be solved to implement L2 VPN based on MPLS.The key technologies to implement ...

Network Packet Generator Based on ActiveX Technique

ZHANG Nan, ZHANG Jian-hua, LI Zhi-shu, HE Wei-lin

2006, 19(1): 58-62.

[Abstract](1312)

Abstract:
To make convenient for programmers to generate network packets according to user’s requirement,a network packet generator was designed and implemented based on COM and ActiveX techniques.The LibnetNT DDL was used to program this generator and the low-level functions were encapsulated according to a ...

Trusted Computing-Based Security Model for Software Protection

ZHENG Yu, HE Da-ke, MEI Qi-xiang

2006, 19(1): 63-67,96.

[Abstract](1103)

Abstract:
With the help of the key technologies in trusted computing(TC) including integrity measurement,access control and seal storage,a TC-based secure model for software protection was proposed.A trusted platform module(TPM),which is an extention of current USB port,is employed in this model to prevent so...

Heavy Metal Pollution of Dust,Topsoil and Roadside Tree Near by Main City Roadways

ZHANG Jian-qiang, SHIRAISHI Sayaka, WATANABE Izumi

2006, 19(1): 68-73.

[Abstract](1359)

Abstract:
To effectively control heavy metal pollution of city roadways induced by motors, the pollution index method was adopted to analyze and evaluate the characteristics of heavy metal pollution of roadway dust and topsoil near by roadside trees, and grasp the status of heavy metal pollution of city roadw...

Fast Weathering Law of Red-Bed Mudstone Slope

ZHANG Jun-yun, ZHOU De-pei

2006, 19(1): 74-79.

[Abstract](1250)

Abstract:
To provide a theoretical reference for the protection of red-bed mudstone slopes,a typical red-bed mudstone slope was monitored in the field.In addition,the laboratory experiment and finite element analysis of changes in temperature of mudstone specimens were conducted.The research result shows that...

Effects of Stress-Free Temperature Difference on Force and Displacement of Welded Turnouts

WANG Dan, WANG Ping

2006, 19(1): 80-84.

[Abstract](1423)

Abstract:
In order to better guide the design,laying and maintenance of welded turnouts,the effects of stress-free temperature difference between two railway lines on the rail displacement and temperature force of a welded turnout were investigated.In addition,the influences of the link style of turnouts,the ...

Fuzzy Edge Detection Based on Cloud Model

XUE Li-xia, WANG Zuo-cheng, LI Yong-shu, Wang Lin-lin

2006, 19(1): 85-90.

[Abstract](1415)

Abstract:
Based on the cloud model and the fuzzy set theory,a new edge detection method was proposed.Firstly,with this method,object clouds are generated using the region growth algorithm on the basis of the gray level of images.Secondly,boundary clouds and fuzzy membership regions for two or more clouds are ...

Method of DEM Deformation Detection without Control Points Based on Differential Model

ZHANG Tong-gang, CEN Min-yi, WU Xing-hua

2006, 19(1): 91-96.

[Abstract](1448)

Abstract:
To improve the performance of the existing deformation detecting algorithms,a novel method based on the differential model was proposed for DEM(digital elevation model) deformation detecting without control points.In addition,it has been successfully used to the deformation detecting of Puwaigou,a d...

Application of IGS Ultra Rapid Products to Real-Time Tropospheric Monitoring

YIN Hai-tao, HUANG Ding-fa, XIONG Yong-liang, CHEN Xian-dong

2006, 19(1): 97-101.

[Abstract](1377)

Abstract:
Through comparing the accuracy and latency of broadcast ephemeris and three kinds of precise ephemeris provided by IGS(the International GPS Service),it was found that only IGS ultra rapid products(IGU) can meet the need for time of tropospheric monitoring.Based on the above recognition and by analy...

Two-Objective Programming Model of Ring Road around Urban Agglomeration

DU Jin-you, XIE Wen-li

2006, 19(1): 102-106.

[Abstract](1362)

Abstract:
A two-objective programming model was proposed to determine rational radii and service widths of urban ring roads.In the model,trip distance and general path impedance were taken as the two objectives.Three situations in terms of different OD pairs are considered in the trip distance function,and th...

Multi-level Recursive Forecasting Method for Road Accidents

LI Xiang-yong, TIAN Peng, ZHANG Nan, LONG Jun-ren

2006, 19(1): 107-110.

[Abstract](1556)

Abstract:
In view of the dynamic and time-varying characteristic of a traffic system,a multi-level recursive forecasting method was proposed,and a multi-level recursive forecasting model for forecasting road accidents was established.With this method,forecast of road accidents is divided into two parts: forec...

Economical Accounting Model of Ecology Environment

LIU Ying, LIU Dan, CHEN Wan-zhi

2006, 19(1): 111-115,121.

[Abstract](1149)

Abstract:
To more accurately estimate economical sustainability and actually show economical aggregate,environmental problems were explained from the point of view of economy.Based on the frame of the integrated environmental and economical accounting(IEEA) publicized by the United Nations in 1993,a framework...

Models for Optimal Production Lot-Sizing in Hybrid Manufacturing/Remanufacturing System

DAI Ying, MA Zu-jun

2006, 19(1): 116-121.

[Abstract](1269)

Abstract:
To determine the optimal lot sizes for the manufacturing of new items and the remanufacturing of returned items in a hybrid manufacturing/remanufacturing system,two models were established on the basis of the assumption that the demand rate and the return rate are continuous and deterministic.The ob...

Effects of Horizontal Merger on the Profits of Supply Chain and Its Members

LI Ling-feng, ZHANG Zhi-gang, HUANG Pei-qing

2006, 19(1): 122-126.

[Abstract](1343)

Abstract:
The influences of horizontal merger on upper suppliers and the profit of the whole supply chain were investigated,and the effects of the power structure within a supply chain during horizontal merger were analyzed.It was assumed that the merger was under Cournot competition.An example shows that the...

Low Regularity Well-Posedness for Nonlinear Wave Equations

YANG Han, WU Hai-gen

2006, 19(1): 127-130.

[Abstract](1283)

Abstract:
Low regularity well-posedness for the Cauchy problem of some nonlinear wave equations was studied.The Cauchy problem is well posed when the Sobolev exponents for the initial data is higher than a critical value.Otherwise,it is ill posed.The known results were extened from n=3 to n=1.The method in pr...

Decision Inference Based on Extended Decision Rules of Probabilistic Information System

PEI Zhen, DU Ya-jun, YING Liang-zhong

2006, 19(1): 131-134.

[Abstract](1335)

Abstract:
A probabilistic information system was used to express the uncertainty relationship between objects and attributes.Based on rough sets and average operator,extended decision rules of the probabilistic information system were obtained.Decision inference of the extended decision rules was implemented ...

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2006 Vol. 19, No. 1