西南交通大学学报

Simple Method of Determining the Initial Value in Secondary Exponential Smoothing Method

WANG Ci-guang

2004, 17(3): 269-271.

[Abstract](1460)

Abstract:
When the secondary exponential smoothing is applied to a trend prediction model, its initial value has to be determined,which makes the process complex and time consuming. Through derivations, it was proved a simple method to utilize the initial index value as the smoothing one. The feasibility and ...

Chance-Constrained Shadow Prices

PENG Yu, JIA Zhi-yong

2004, 17(3): 272-276.

[Abstract](1442)

Abstract:
To promote researches on stochastic programming (SP), some characteristics of SP and its dual programming were obtained via defining the dual programming of reliant programming for chance-constrained programming. From the optimal solution to the dual programming, the concept of chance-constrained sh...

Multidimensional Grey Evaluation Model for Suppliers Selection and Evaluation

SUN Chao-yuan, PENG Qi-yuan

2004, 17(3): 277-280.

[Abstract](1340)

Abstract:
Multidimensional grey evaluation method was used to select suppliers from four indexes such as price, quality, delivery period and service level. This method can avoid the evaluation error due to subjective factors in a certain degree and obtain full information about price, quality, delivery period...

Modified Clark-Wright Algorithm for Vehicle Scheduling Problem with Fuzzy Cost Coefficients

ZHANG Jian-yong, GUO Yao-huang, LIJun

2004, 17(3): 281-285.

[Abstract](1427)

Abstract:
The traditional deterministic vehicle scheduling problem (VSP) was expanded into a VSP with fuzzy features. The cost coefficients of the VSP with the features were treated as fuzzy numbers. After a simple description of the VSP with fuzzy cost coefficients, a mathematical model for the fuzzy schedul...

Action of International Direct Investment on Invested Country Economics

HUANG Jian-hong, PU Yun

2004, 17(3): 285-290.

[Abstract](1474)

Abstract:
In order to better attract and utilize foreign capital, non-linear programming was used to investigate the action mechanism of international direct investment and its properties from the viewpoint of labor and specialization divisions. It was pointed out that international direct investment is not a...

Solution of Complete Style of Interval Linear Programming

LI Wen-hua, GUO Jun-peng

2004, 17(3): 291-295.

[Abstract](1256)

Abstract:
Based on the current related researches, a complete style of interval linear programming was defined. All the coefficients of its objective function and constraints can be interval numbers, and its constraint conditions may be equations or inequations. An order relation between interval numbers refl...

Gradually-Vanishing Asset and Its Pricing Model

ZHANG Xiu-min, HU Yang, RANHui-juan

2004, 17(3): 296-300.

[Abstract](1120)

Abstract:
In view of the characteristic of some assets different from perished assets,i.e., their values vanish gradually, conception of gradually-vanishing asset (GVA) was put forward. From the relationship between the number of products and the need of consumers, they were divided into two classifications. ...

Nonlinear Programming Model and Algorithm of Two-Layer Distribution Network Based on Integrated Transit-Inventory Concept

ZHANG Jin, MA Xiao-lai, DU Wen

2004, 17(3): 301-305.

[Abstract](1465)

Abstract:
Based on analyzing the existing models of transit and inventory and the characters of a modern logistics distribution network, a nonlinear two-layer distribution network model was put forward from an integrated transit-inventory concept, and a non-linear programming model, with the restriction of ca...

Hardware Design of Fast Module Exponential Algorithm

FAN Ming-yu, WANG Jian-hua, WANG Guang-wei

2004, 17(3): 306-310.

[Abstract](2085)

Abstract:
Fast module exponential algorithm, fast module multiplication algorithm and fast module addition algorithm were integrated to form a hybrid fast RSA algorithm for large number operations. A hardware scheme for implementation of RSA key was proposed using the proposed algorithm. In the algorithm,m-ar...

Resonant Frequency of Cavity-Backed Rectangular Patch Antenna with Metal Column

LIU Yun-lin

2004, 17(3): 311-313.

[Abstract](1329)

Abstract:
A finite element-boundary integral formulation was introduced to investigate the resonant frequency of a cavity-backed rectangular patch antenna with a metal column. The effects of the size of the metal column and the position of feeding points on the resonant frequency were discussed in detail. The...

Improved Beamforming Algorithm Based on Subspace Tracking

WANG Jian-ying, DENG Ya-bo, YIN Zhong-ke, CHEN Lei

2004, 17(3): 314-317.

[Abstract](1386)

Abstract:
Based on the ESPRIT (estimating signal parameter via rotational invariance techniques) method, an improved algorithm for beamforming was proposed by utilizing the subspace tracking algorithm in perturbation analyses to obtain ideal beamforming under the condition that the direction of expected signa...

Application of Multiwavelet Multiresolution Analysis in Signal Processing of Power Systems

LIUZhi-gang, ZENG Yi-da, QIAN Qing-quan

2004, 17(3): 318-323.

[Abstract](1461)

Abstract:
Multiresolution analysis method of multiwavelet was briefly introduced. Its application in fault monitoring, fault data compression and denoising was studied, and its performances in fault diagnosis and monitoring and fault data processing were compared with traditional wavelet. Simulation results s...

Optimal Design of Wavelength-Convertible Optical Switch for Optical Networks

ZHANG Lan

2004, 17(3): 324-328.

[Abstract](1359)

Abstract:
In order to resolve the contradiction between the high cost of wavelength converters and their critical roles in optical networks, a new architecture of wavelength-convertible switches was put forward, and its optimal routing and wavelength assignment algorithm was proposed. Simulations were done on...

Performance Comparison of Local Zero-Order Predictive Methods for Chaotic Time Series

LIHeng-chao, ZHANG Jia-shu

2004, 17(3): 328-331.

[Abstract](1747)

Abstract:
Performances of local zero-order prediction methods for chaotic time series were compared in aspects of prediction accuracy, anti-noise and the ability of multi-step prediction through computer simulation. Simulation results show that distance-weighted predictive method is the best when there are no...

Fuzzy Logic-Based Direct Torque Control of Permanent Magnetic Synchronous Motor

WANG Jun, PENG Hong

2004, 17(3): 332-336.

[Abstract](1392)

Abstract:
In order to improve the system stability and raise the response speed, a new control scheme, fuzzy logic-based direct torque control, for a permanent magnet synchronous motor (PMSM) was put forward. In this scheme, zero voltage space vectors are introduced to simplify fuzzy control rulers. Simulatio...

Information Fusion and Cluster Control System for Natural Gas Flow

YU Li-jian, YANG Hua

2004, 17(3): 337-340.

[Abstract](1638)

Abstract:
According to the mathematical model of natural gas flow, a flow control system was proposed based on information fusion and cluster analysis. The system consists of an ART-2 network and a BP network. Pressure differences, pressures and temperatures obtained by sensors are fused and the output spaces...

Scheduling of Reconfigurable Manufacturing System Based on Timed Reconfigurable Petri Net

CAI Zong-yan, WANG Ning-sheng, REN Shou-gang, LI Ya-bai

2004, 17(3): 341-344.

[Abstract](1884)

Abstract:
The proposed scheduling algorithm for reconfigurable manufacturing systems is based on timed reconfigurable Petri net. It generates and searches a partial reachable graph to find an optimal or near optimal feasible schedule according to the firing sequence of transitions of the timed reconfigurable ...

Defect Detecting of Train Wheelset Tread Surface with Laser Displacement Sensor

AO Yin-hui, XUXiao-dong, WUNai-you

2004, 17(3): 345-348.

[Abstract](1526)

Abstract:
A novel method for automatically detecting the scrape and exfoliation of train wheelset tread surfaces was proposed. In this method, data on train wheelset tread surfaces are gained by using laser displacement sensors, and analyzed through deviation rectifying, interpolation and multistage median fi...

Aposteriori Detection of Model Error in Surveying Adjustment

FAN Dong-ming

2004, 17(3): 349-352.

[Abstract](1293)

Abstract:
A parameter elimination method to convert a parameter adjustment model to a condition adjustment model was brought forward. Using this method, a parameter adjustment model can be changed into a condition adjustment model through eliminating all the parameters in the parameter adjustment model. As a ...

Spatial Analysis of Traffic Geographical Information

XUJing-hua

2004, 17(3): 353-357.

[Abstract](1463)

Abstract:
Based on the methods and techniques of geographical information system (GIS) and traffic geographical information system (GIS-T), the main spatial (configuration) characteristics and geographical background information of a traffic network were analyzed from itself and its background factors and by ...

Urban Spatial Visualization Based on Principle of Sub-water Sight

FENG De-jun, LI Yong-shu

2004, 17(3): 358-361.

[Abstract](1379)

Abstract:
Based on the principle of sub-water sight, the 3D model of urban overground and underground objects was set up in order to solve the problem of visual confusion resulted from modeling directly from their 3D coordinates. According to the principle, when the vision point is located on the ground, a pr...

Experiments of Support Structure of Twin-Bore Highway Tunnels

LIN Gang, HE Chuan

2004, 17(3): 362-365.

[Abstract](1704)

Abstract:
Similar simulation tests were made to determine the reasonable structure and principle of supporting for twin-bore highway tunnels with four driveways excavated in classⅡsurrounding rock, and in-situ testing was carried out to prove and complement the experimental result in laboratory. The research ...

Mechanism of Sandpile Avalanche in Critical State

LI Shi-xiong, YAO Ling-kan, JANG Liang-wei

2004, 17(3): 366-370.

[Abstract](1314)

Abstract:
The dynamical characters of granular mixtures were investigated based on the concept of self-organized criticality (SOC). Through sandpile experiments with one-sided slope, it was discovered that a sandpile consisting of non-uniform sand with a sorting coefficientφ=2.85 exhibits SOC, while the large...

Investigation on Local Stresses in Anchorage Zone of Continuous Rigid Frame Bridge

XU Wei-guo, HE Guang-han

2004, 17(3): 371-374.

[Abstract](1581)

Abstract:
To arrange the prestressed tendons and anchor devices on the web of box girder conveniently, a theoretical analysis, numerical calculation and model test on local stresses in concrete under anchor devices were performed separately using a typical segmental model, a subrange model and a similar model...

Nonlinear Time Domain Buffeting Response Analysis for Long-Span Railway Cable-Stayed Bridge

LI Yong-le, LIAO Hai-li, QIANG Shi-zhong

2004, 17(3): 375-380.

[Abstract](1782)

Abstract:
Based on the time domain wind loads obtained by wind field simulation, the nonlinear behaviors of bridge buffeting were investigated by the buffeting analysis method for long-span bridges. In the investigation, a long-span railway cable-stayed bridge was regarded as an example, and both structural g...

Experimental Research on Separation of Concrete-Filled Steel Tube and Effect of Pouring Pulp

YE Yue-zhong, WEN Zhi-hong, PAN Shao-wei

2004, 17(3): 381-385.

[Abstract](1414)

Abstract:
The mechanical properties of concrete-filled steel tubes (CFST), including elastic modulus and load-bearing capacity etc, and the effect of pouring pulp were investigated experimentally under the condition of separation of concrete and steel tube. The result indicates that with the increase of separ...

Graph-Based Algorithm for Mining Frequent Closed Itemsets

LI Li, ZHAI Dong-hai, JIN Fan

2004, 17(3): 385-389.

[Abstract](1404)

Abstract:
To raise the efficiency of data mining, a graph-based algorithm for mining frequent closed itemsets, called GFCG (graph-based frequent closed itemset generation) was proposed. In this algorithm, the bit vector technique is used to construct a directed graph to represent the frequent relationship bet...

Quantum Evolution Algorithm Based on Descending Search

MA Shu-xia

2004, 17(3): 390-393.

[Abstract](1772)

Abstract:
To raise global search capacity and convergent speed, a new evolution algorithm, based- descending search quantum evolution algorithm, was put forward on the basis of the quantum evolution algorithm (QEA) and the hybrid genetic algorithm. In the proposed algorithm, the descending search theory of op...

Remarks on Gronwall Inequality

LIANG Shao-jun

2004, 17(3): 394-396.

[Abstract](1001)

Abstract:
The classical Gronwall inequality and its proof by using general methods were introduced. The estimate of linear control was extended to that of nonlinear control by the comparison theorem. The application of Gronwall inequality to the study of the characteristics of solutions of differential equati...

Spectrum of Polynomial Conjugate OperatorT

CUIHong-wei, HAN Liu-bing

2004, 17(3): 397-399.

[Abstract](1229)

Abstract:
The concept of a special normal operator, self-conjugate operator, in Hilbert space was extended to a polynomial conjugate operator. Based on the properties and spectrum feature of a normal operator in Hilbert space, the spectrum of the extended operator—polynomial conjugate operatorTwas investigate...

Extension of Lin-Bairstow Method

FENG Tian-xiang

2004, 17(3): 400-402.

[Abstract](1084)

Abstract:
Lin-Bairstow method was extended to derive the factors of polynomials with more than 3rd-degree. A numerical method for solution ofkth-degree (k≥3) factors of real coefficient polynomials was proposed. An approach similar to Newtonian iteration method is used in the proposed method, and the error is...

Matrix Solution of Integral Indeterminate Equations of First Degree and Its Program Design

YAN Lin

2004, 17(3): 403-407.

[Abstract](1434)

Abstract:
By using the Euclidean algorithm and invertible linear transformation over an integral ring, the solution of integral indeterminate equations of the first degree was investigated in theory, and its matrix solution based on the elementary matrix transformation was proposed. In addition, the program f...

Blow-up of Solution of Nonlinear Evolution Equation

YANG Zhi-feng, HAN Liu-bing

2004, 17(3): 408-410.

[Abstract](1263)

Abstract:
Based on the energy conversation law for a nonlinear evolution equation, blow-up of the initial value of its solution was investigated by using the improved convexity analysis method and the Sobolev s embedding theorem. A sufficient condition for blow-up of the initial solution of this equation was ...

Study on Karyotypes of SixRanunculusSpecies in Sichuan

LUO Hong-xia

2004, 17(3): 411-414.

[Abstract](1102)

Abstract:
The somatic chromosome number and detailed chromosome morphology of six Ranunculusspecies in Sichuan were studied. The results show that their chromosome numbers are 2n=16 forR.tanguticus, 2n=32 forR.nephelogenes, 2n=16 forR.ficariifolius, 2n=32 for R.sceleratus, 2n=14 forR.japonicus, and 2n=16 forR...

Synthesis of Bis-azo Chromogenic Acyclic Crown Ethers

TONG Zhi-ping, LIUJing, GONG Zhong-lun

2004, 17(3): 415-418.

[Abstract](1037)

Abstract:
Two new types of bis-azo chromogenic acyclic crown ethers with brigded chains of azachains and terminals of phenolic hydroxyl and chromogens of 4-R benzenediazo groups 5 and 6 have been conveniently synthesized with good yields via coupling-bridging reactions from salicyladehyde, 4-nitro (-chloro,-m...

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2004 Vol. 17, No. 3