西南交通大学学报

Biological Properties and Spatial Pattern of Oberesfuscipennis

ZHANGJian-qiang

2002, 15(4): 353-356.

[Abstract](1024)

Abstract:
AnOberes fuscipennis(Chevrolat) usually completes a life cycle within one year in Sichuan province and Chongqing, southwest China. It spends thewholewinter in a formof ripe larva. Thereafterthe larva ofO. fuscipennisdevelops to its adult stage. This stage lasts relatively shorter than its larva stag...

A Nonlinear Analysis of Long-Span Suspended Arch Bridge

BUYi-zhi, YANGXing-wang

2002, 15(4): 357-361.

[Abstract](1566)

Abstract:
A 3-dimensional compound structural calculation model constructed by beams and rope elements is used to analyze the structural behavior of a certain long-span suspended arch bridge. In the analysis, the structural nonlinearity and ultimate bearing capacityofmembers are considered, and the deformatio...

A Shear Lag Analysis for a Simply Supported Steel-Concrete Composite Box Girder

CHENGHai-gen, QIANG Shi-zhong

2002, 15(4): 362-366.

[Abstract](1287)

Abstract:
Adifferential equation for calculatingthe normal stress atthe transverse section of the flange of a steel-concrete composite box girder is derived based on the compatibility of strain and the equilibrium of forces on an micro element of the flange section. Separation of variables is employed to solv...

A Numerical Method for Simulating Natural Wind Based on Nonstationary Random Process

LUOXiong, LI Yong-le

2002, 15(4): 367-370.

[Abstract](1424)

Abstract:
The second nonstationary random process mathematical model, which is based on data, is the a modification to the first nonstationary random process mathematical model. To build a model of this kind, a nonstationary random process mathematical model is set up through fast Fourier transformation and H...

Deformation Analysis for Landslide-Tunnel Interaction

MAOJian-qiang, ZHOUDe-pei

2002, 15(4): 371-376.

[Abstract](1446)

Abstract:
Surveys reveal that various damages often occur tomany railway tunnelswhich are constructed in landslides, thus the normal operations of railways are influenced. A finite element method for contact problems is developed to study the interaction mechanism between landslides and tunnels and to analyze...

The Deformation Behavior of Super-Large Pile Group under Vertical Load

XIETao, YUANWen-zhong, ZHUMing

2002, 15(4): 377-381.

[Abstract](1569)

Abstract:
Based on the model testof a super-large pile group undervertical load, the characteristic of load transfer, the bearing behavior, and the lawof variation in side resistance of the pile group are analyzed. It is shown thatunderthe experimental conditions the middle piles are subjected tothe maximumve...

Stability Evaluation of Rock Mass Slope with Weak Intercalated Layers

LIUXiao-li, ZHOUDe-pei

2002, 15(4): 382-386.

[Abstract](1420)

Abstract:
The stability evaluation of a rock mass slope with regular weak intercalated layers is discussed. On the basis ofthe plasticity limit analysis, the energy coefficient is proposed to evaluate the stabilityof rock mass slopes using the movable mechanismmethod, with a set of formula derived. The stabil...

Analysis of Bottom Cracks in Asphalt Layers with Geometric Functions and Weight Functions

LUO Rui, HUANGXiao-ming, ZHANGXiao-meng

2002, 15(4): 387-392.

[Abstract](1599)

Abstract:
In order to effectively analyze the crack propagation in asphalt pavements, three geometric functionsF(a/b)for analysis of bottom cracks in asphalt layers are yielded by fitting some discrete values of crack lengths. These discrete values with different ratios of crack lengthato asphalt thicknessbar...

GPS/DR Vehicle Location and Navigation System: A Region Division Approach

LI Cheng-gang, GONGTao, DINGJian-wei

2002, 15(4): 393-398.

[Abstract](1444)

Abstract:
A region division approach for vehicle location and navigation is presented, which is based on GPS technique, dead reckoning (DR) and the map matching of digital road networks. In order to meet the needs ofwide applications, a region-divided model forthe vehicle location and navigation system(VLNS) ...

A Local Adjustment Algorithm for Inserting Constrained Segments in Delaunay Triangulation

SONG Zhan-feng, ZHANZhen-yan, PUHao

2002, 15(4): 399-403.

[Abstract](1461)

Abstract:
An algorithm for constructing constrained Delaunay triangulation (CDT) is presented. First, the Delaunay triangulation for constrained data sets is constructed. Then, by inserting constrained segments into the Delaunay triangulation, a local adjustment ismade to its impact area on the maximumangle p...

Nonlinear System Identification with Recurrent Neural Network Based on Genetic Algorithm

FENGHao, HEHong-yun, MI Zu-qiang

2002, 15(4): 404-407.

[Abstract](1806)

Abstract:
An internal time-delay recurrent neural network (RNN) is used for identification of nonlinear dynamic systems, and its dynamic equations are described. As a learning algorithm, an improved genetic algorithm is applied to train the RNN. Two identification simulation examples for nonlinear dynamic SIS...

A Secure and Efficient Conference Key Distribution Scheme

YUANDing, FANPing-zhi

2002, 15(4): 408-412.

[Abstract](1378)

Abstract:
A security flaw in the conference distribution scheme, namely GDH.2, proposed byM. Steiner et al, is found out, and a new secure and efficient conference key distribution scheme suitable for users exchanging information on insecure communication networks. Compared with GDH.2, the security of this ne...

Simulation Study on the Control Systems of Mechanical Braking of Maglev Trains

ZHANGXiang, ZHANGKun-lun, LIANJi-san

2002, 15(4): 412-416.

[Abstract](1450)

Abstract:
An analysis is made of the mechanical braking control systems of EMS maglev trains. A mathematical model for the mechanical braking system is built, on the basis ofwhich a comparison between the several control modes of the mechanical braking system is made. Simulation results show that the adaptive...

Spatial Correction of the Distorted License Plate Image of Automobiles

HAO Yong-jie, LIUWen-yao, LUShuo

2002, 15(4): 417-420.

[Abstract](1353)

Abstract:
According to the general style of automobile license plates in China, a method based on Hough transformation is proposed to acquire the parameters of four borders of the license plates. The coordinates of the four vertices of the quadrilateral plate are obtained, and away to performHough transformat...

Experimental Study on Exhaust Emission of Diesel Engine under Steady Operating Conditions

ZHOUBin, LI Yu-mei, WANG Guo-qua

2002, 15(4): 421-424.

[Abstract](1203)

Abstract:
The emission of a diesel engine differs in different operating conditions. The exhaust emission properties of diesel engines 6135ZG under steady operating conditions are studied experimentally, with its load-emission behaviors, contour emission line, and a 13-mode emission graph presented. This stud...

A Tilting Monitoring System of Tilting Train Based on Single Axis Gyroscope Platform

WANGXue-mei, NI Wen-bo

2002, 15(4): 425-429.

[Abstract](1636)

Abstract:
A tilting monitoring system for tilting trains which is based on single-axis gyroscope platform is presented, and its working principle and application to the tiltingmonitoring of tilting trains are analyzed in detail. Meanwhile, an in-depth error analysis of the platform system reveals that the exc...

Prediction Model and Program Design for Transportation Quantity of Postal Trucks

YANG Wei

2002, 15(4): 430-433.

[Abstract](1434)

Abstract:
An introduction is made to the method and techniques of calculating the post transportation quantity and load turnover when a computer management information system is applied to the postal transportation. Using the Winter multiplication method, a prediction model for transportation quantity is buil...

Rational Number of Arrival and Departure Tracks in Passing Stations Along Single-Track Railway

YANHai-feng, PENG Qi-yuan, BAO Wei-min

2002, 15(4): 434-438.

[Abstract](1637)

Abstract:
There exists randomicity in the crossing and overtaking behaviors of trains on single-track railways. The number and patterns ofthe crossing and overtakingoftrains in various operation conditions are studied by probabilistic analysis. The relationships between the number of arrival and departure tra...

Sensitivity Analysis of Equilibrium Network Flow

LIUHai-yan, SUNHong, DUWen

2002, 15(4): 439-442.

[Abstract](1299)

Abstract:
Equilibrium network flows are not necessarily unique, and this nature creates difficulties in the sensitivity analysis of network related phenomena. In this paper, a minimum distance approach is proposed for the sensitivity analysis of equilibrium network flow. With this method, the solution space o...

A Heuristic Layout Restriction Algorithm for Solving Two-Dimensional Rectangular Layout Loading Problems

LIBing, YEHuai-zhen

2002, 15(4): 443-447.

[Abstract](1151)

Abstract:
Based on an analysis ofthe loading problemswithtwo-dimensional rectangular layout, a heuristic algorithmfor the novel two-dimensional rectangular layout devised in this paper is proposed by means of setting layout restraint conditions for the loading problems. Experimental results show that the opti...

Fuzzy Comprehensive Evaluation of Engineering Contracts

LIXiao-long, FUQiang, WUZhen-ye

2002, 15(4): 448-453.

[Abstract](1326)

Abstract:
Evaluation of the execution of contracts is important in engineering construction supervision. This paper begins with an investigation on the features of engineering contracts, followed by an analysis of the engineering contracts using analytic hierarchy process (AHP). Then, a fuzzymathematical mode...

Tactic Study on Proportional Sale of State-Owned Shares at Floating Prices for Their Circulation

CHENShe, WUYi-bin, WUJing-ye

2002, 15(4): 454-458.

[Abstract](1010)

Abstract:
The kernel problem of state-owned shares’reduction lies in how to price the shares, while the kernel problem of their circulation lies in the capital sustainability of a securities market. The reduction of state-owned shares is concerned with the steady development of the security market and the equ...

An Extended Model and a Generalized Algorithm for a Job Scheduling Problem in Production Management

WANGMeng-lan, HUANGTian-min

2002, 15(4): 459-462.

[Abstract](1514)

Abstract:
A discussion of the job scheduling problem of assigningnparts to be processed tom machines is made. Withmachines allowed to be idle and a idea of load introduced, where loadmeans the maximum of parts processed by each machine, an extended model and a generalized algorithm are obtained without the co...

A Decision Model for Product Scheme Evaluation Based on AHP and Degree of Gray Incidence

SONGJiu-peng, DONGDa-wei, GAO Guo-an

2002, 15(4): 463-466.

[Abstract](1522)

Abstract:
Considering the complexity of multi-objective decision of product scheme design, an evaluation system for product schemes is built, and the standardization of its evaluating indicators is made. Based on this, a multi-objective decision model is then built by using the analytic hierarchy process (AHP...

A Hidden Markov Decision Model

ZHAOLian-wen, WUXiao-xiong, GUO Yao-huang

2002, 15(4): 467-469.

[Abstract](1256)

Abstract:
A discussion is made of the relationship between the unobservable status and sample value of Markov decision processes. With a definition of error-avoiding characteristic function introduced, a hidden Markov decision model is built by using the structure of hidden Markov processes and Markov decisio...

The Construction and Convergence of Ishikawa Iteration for Quasi-Nonexpansive Operator Sequence

HUANGJia-lin

2002, 15(4): 470-472.

[Abstract](1045)

Abstract:
A study is made on the fixed points of the quasi-nonexpansive operator sequence with a mapping from the bounded closed convex subset of a uniformly convex Banach space into the closed convex subset in the same space. The sufficient conditions for the quasi-nonexpansive operator sequence to have a co...

The Eigenvalues of Unsymmetric Tridiagonal Matrices

FENGTian-xiang, TANMing-shu

2002, 15(4): 473-476.

[Abstract](1177)

Abstract:
First, an unsymmetric tridiagonal matrixTis transformed into a symmetric tridiagonal matrix T*. Then, with the symmetric tridiagonal matrixT*and a displacementσgiven, an algorithm of solving for the simplified matrixT^from the matrixT*is presented. Thus, the eigenvalues of the symmetric tridiagonal ...

A Note on the Fuzzy Filters of Lattice Implication Algebras

ZHAO Guang-feng, XUYang, SONG Zhen-ming

2002, 15(4): 477-481.

[Abstract](1166)

Abstract:
The properties of the fuzzy filters of lattice implication algebras are further studied on the basis of the structures of lattice implication algebra. It is shown that a family of congruence relations can be induced by a fuzzy filter of lattice implication algebra. The algebraic structure of this fa...

Search Advance Search

Journal Search

Search Type

NewsMore

instruction for authors

Read this journal

LinksMore

2002 Vol. 15, No. 4