西南交通大学学报

FaultLocation System for Automatic Block and Continuous Transm ission Lines Based on S-InjectionM ethod

HE Zheng-you, LIWei-hua

2005, 18(5): 569-574.

[Abstract](1308)

Abstract:
A wireless-node communication network was designed to detect single-phase-to-ground faults in railway automatic blocking and continuous transmission lines by combining S-injectionmethod with wireless nodes. The system makes use of automatic net-organization function and high fault- tolerant characte...

Feed-Forward Intelligent Fuzzy Logic Control of H ighway TunnelVentilation System

HE Chuan, LIZu-wei, FANG Yong, WANGMing-nian

2005, 18(5): 575-579.

[Abstract](1474)

Abstract:
Fuzzy logic was applied to the feed-forward control of the ventilation system of a long highway tunnel to save electric energy and effectively solve the problems of the traditional control methods, such as time lag and fans frequent start-up. The constitution of the feed-forward intelligent fuzzy lo...

ExperimentalResearch ofW ind-Induced Responses of ChongqingM arriott InternationalConference Center Building

ZHENG Shi-xiong, XUE Shang-ling

2005, 18(5): 580-584.

[Abstract](1666)

Abstract:
To obtain thewind load andwind-induced responses of theChongqingMarriott International Conference Center Building, a tall steel structure building with a height of 303 m and the first frequency of0. 123 4 Hz, to evaluate its living comfortableness and safety, a wind-tunnelmodel test was carried outt...

Analysis ofFlow Characteristics around H igh-Speed Railway Bridge-Vehicle System under CrossW ind

HUANG Lin, LIAOHai-li

2005, 18(5): 585-590.

[Abstract](1791)

Abstract:
An analysis was carried out for flow characteristics around a vehicle-bridge system consisting ofGerman ICE ( intercity-express) vehicle and standard simply-supported bridge under cross wind. Based on the two-dimensionalReynolds averaged incompressible Navier-Stokes equations, the RNG (renormalizati...

Numerical Simulation ofReasonable Relative Position of Smoke Tower and Passageway of Subway Station

GUZheng-hong, CHENG Yuan-ping, ZHOU Shi-ning

2005, 18(5): 591-594.

[Abstract](1577)

Abstract:
FDS ( fire dynamics simulator), a field simulation software, was used to investigate the spread regularity of smoke and its influencing factors in order to determine the reasonable relative position of smoke tower and passageway ofa subway station to prevent the smoke extracted through the smoke tow...

Research on 3D FEM Nonlinear SimulationM ethod for Shear Connectors

ZHANG Qing-hua, LIQiao, TANG Liang

2005, 18(5): 595-599.

[Abstract](1740)

Abstract:
Based on the finite elementmethod (FEM) and the constitutive model of concrete, a method of analyzing the mechanical behavior of shear connectors was put forward. This method includes FEM simulation analyses and verification experiments, but only few experiments must be carried ou.t The method was u...

ExperimentalResearch on Shear Properties of New-to-O ld Concrete Interface

WANG Zhen-ling, LIN Yong-jun, QIAN Yong-jiu

2005, 18(5): 600-604.

[Abstract](1550)

Abstract:
Shear experiments were conducted on 18 Z-shape specimens from 6 different groups to investigate the shear properties of the interface of new and old concrete. The effects of different interfacial techniques,i. e., smearing cement paste, directly casting new concrete, and smearing commercial interfac...

Numerical Simulation ofCavity DevelopmentBased on Improved Calculation ofPlume Region

YANG Jun-liu, HEDan

2005, 18(5): 605-609.

[Abstract](1155)

Abstract:
To enhance the numerical simulation accuracy of cavity development in solution mining of rock sal,t a calculationalmethod for the concentration difference between the saltand themain region of cavitywas proposed by considering plume effects. The finite analytic method (FAM) was used to solve the tur...

Ionospheric BiasesM odeling Technique for GPSMultiple Reference Stations

LICheng-gang, HUANG Ding-fa, YUAN Lin-guo, ZHOULe-tao, XURui

2005, 18(5): 610-615.

[Abstract](1525)

Abstract:
Four typicalmethods to describe the ionospheric biases at the roverpositionwere discussed to develop general formulas of correction generationmodels, both the advantages and disadvantages of each technique were summarized. Test data from both GPSNOS (GPS reference station network of Sichuan) and SCI...

Supersymmetry of In-Group and“Out-Group”Particles and Some Strange Phenomena

JIAO Shan-qing, XUDi-yu, GONG Zi-zheng, CHEN Bo-tao

2005, 18(5): 616-620.

[Abstract](1420)

Abstract:
The symmetry of the in-group particles, which are of three generation fermions, and the “out-group”ones, which are not admitted by three generation fermions, was discussed. Itwas found that the“out-group”antiparticles of Bose type, which came into being because of CP ( charge conjugation-parity cons...

Search for TeV Gamma-Ray Bursts using Tibet-IIIAir Shower Array Data

ZHOUXun-xiu, HUANG Qing

2005, 18(5): 621-624.

[Abstract](994)

Abstract:
A search forTeV gamma-ray bursts (GRBs) was carried outby using the data ofTibet-III air shower array. About1. 45 billion eventswere analyzed. A GRB candidatewas chosen as a shower cluster appearing in a given small sky bin and a given time interva.l Themethod of equi-zenith angle was used to estima...

Preparation ofBiodegradableM icrospheres Containing Human Serum Album in

ZHOU Shao-bing, SUN Jing, ZHENGXiao-tong

2005, 18(5): 625-627.

[Abstract](1356)

Abstract:
Poly-DL-lactide-b-polyethylene glycol (PELA) block copolymerswere synthesized by ring- opening polymerization of lactide with polyethylene glyco.l PELA microspheres containing human serum albumin (HSA) were elaborated by the solvent extraction method based on the formation of doubleW1/O/W2emulsion. ...

Dynam ic Compensation for Railway Line InformationM onitoring System ofTilting Train

WANGXue-mei, LING Jian-hui, LIFu, NIWen-bo

2005, 18(5): 628-632.

[Abstract](1486)

Abstract:
To improve the dynamic characteristics of themonitoring system ofa tilting train based on a single-axis gyroscope platform, a differencemodel to describe the dynamic characteristics ofgyroscope platformswas establishedwith the least squaresmethod and its improved algorithms, and the dynamic characte...

Application ofDigraph Theory to Process Scheduling

MAShu-wen, CHEN Yong, DUQuan-xing, ZHANG Jian-an

2005, 18(5): 633-636.

[Abstract](1463)

Abstract:
To set up an effective decision model of process scheduling, the digraph theory was applied. Based on the theory, processing features are expressedwith the vertices of a directed graph, and datum relationships among the processing features are describedwith directed edges. As a resul,t a directed pa...

Effect ofNumber ofTraining Samples on ANN Prediction Accuracy for Cutting Force

FAN Sheng-bo, WANG Tai-yong, WANG Wen-jin, DONG Ting-jian

2005, 18(5): 637-640.

[Abstract](1618)

Abstract:
In order to predictcutting force using training samples as few as possible, training samples with differentnumberswere selected to train an artificialneuralnetwork (ANN) respectively, and the effectof the numberof training samples onANN prediction accuracy for cutting force based on the LM (Lenvenbe...

ToolW earM onitoring Based on Integrated NeuralNetworks

GAOHong-li, XUMing-heng, FUPan

2005, 18(5): 641-645.

[Abstract](1454)

Abstract:
A tool wear condition monitoring approach based on integrated neural networks was proposed to recognize and predicttoolwearconditions inmilling operations. In this approach, vibration and cutting force signals are decomposed into time sequences in different frequency bands bywavelet packet transform...

Performances ofUWB W ireless Communication System s Based on Quadratic Time-Hopping Sequences

PENG Dai-yuan, YEWen-xia

2005, 18(5): 649-653.

[Abstract](1344)

Abstract:
Structures of the extended quadratic time-hopping sequences, the general class ofquadratic time-hopping sequences and some of their special kinds were discussed. Their Hamming cross- correlation propertieswere compared. Based on the discussion and comparison, the error rate of the ultra-wide band (U...

Instantaneous Parameters and Spectrum Analysis in M echanical Speed-Change Process

ZHANG Jie, CHEN Chun-jun, LIN Jian-hui

2005, 18(5): 654-648.

[Abstract](1412)

Abstract:
To enhance the analytical accuracy of vibration signals in a mechanical speed-change process, a non-linear relationship between the measurement systems of speed-change and the time varying statistic characteristics of the signalswas established by analyzing themeasurementprocess for a rotating machi...

DesignM ethod for Ultra-W ideband Pulse Based on the Parks-M cC lellan Algorithm

XIAO Shang-hui, JIANG Yi

2005, 18(5): 654-648.

[Abstract](1592)

Abstract:
According to the characteristics ofUWB (ultra-wide band) pulse waveforms, a new pulse shape design method for UWB radios based on Parks-McClellan algorithm was proposed. In the method, the pulse shape design is taken as optimal design of a FIR (finite impulse response) filter. TH ( time hopping) and...

VirusDetection Based on Rough Set and Bayes C lassifier

WENQi, PENGHong, XUZhi-gen

2005, 18(5): 659-663.

[Abstract](1622)

Abstract:
Rough set and Bayes classifier were integrated in virus detection. On the basis of the feature reduction algorithm of rough se,t the proposed method takes synthetically into account the influences of the dependency of condition features and decision-making features and those of the dependency among ...

Transition Region Extraction Algorithm Based on LocalFuzzy Entropy

ZHANG Chao, ZHANG Jia-shu, CHENHui, JIADong-li

2005, 18(5): 663-666.

[Abstract](1434)

Abstract:
To improve the performances of transition region extraction algorithmsundernoises, a novel local fuzzy entropy-based transition region algorithm was proposed by making improvement to the existing local entropy-based transition region algorithm. The proposed algorithm makes full use of the difference...

HybridM agnetic Suspension System Based on Zero Power Control Strategy

WANG Li, ZHANGKun-lun

2005, 18(5): 667-672.

[Abstract](1448)

Abstract:
A hybrid suspension system with permanent and electric magnets was designed, and its mathematicalmodelwas derived. A controllerwas designed based on zero power control strategy,i. e. the current in electromagnets ismaintained ataboutzero. Simulation shows thatwith this controller the system realizes...

M echanism and Influencing Factors ofOvervoltage on Inverter-Fed TractionM otor Term inal

TONG Lai-sheng, WUGuang-ning, WEN Feng-xiang

2005, 18(5): 673-676.

[Abstract](1437)

Abstract:
Overvoltage is one of the main causes of damage in the isolation of inverter-fed traction motors. To solve this problem, the mechanism and influencing factors were analyzed with the transmission line theory and simulation on the equivalentcircui.t The analyses show thatovervoltage is a function of t...

Principle ofAssumed Temperature Reduced Thrust Takeoff

ZHAO Ting-yu

2005, 18(5): 677-679.

[Abstract](1532)

Abstract:
For correct and wide application of reduced thrust takeoff technique, the temperature characteristics ofhigh bypass ratio turbofan engines and the takeoffperformance of large aircraftswere analyzed. Assumed temperature is the equivalent ambient air temperature determined by the actual takeoffmass of...

Transportation SafetyM onitor Information System for Gulmud-Lasa Line in Q inghai-TibetRailway

LUO Xiu-yun, PU Yun, CHEN Shang-yun

2005, 18(5): 680-683.

[Abstract](1590)

Abstract:
The influences of the environment on railway transportation safety on Gulmud-Lasa line in Qinghai-Tibet railway was analyzed, the necessity of a transportation safety supervision information system for the railway line was discussed. The initial design of the system was presented. In the design, the...

Game Analysis of Information-Based M anipulation of SecuritiesM arket

ZHANG Yong-peng, QIUPei-guang, ZHUWei

2005, 18(5): 684-689.

[Abstract](1351)

Abstract:
An existingmodel available in literature wasmodified to degrade the accuracy of private information from an informer, so that he can manipulate the securities market repeatedly in a long period. The analysis result shows tha,t the informer has tomake the public believe in his honesty to lead the pub...

M onopoly and Regulation in the Reform ofElectricity Industry in China

TIANHong-yun, CHEN Ji-xiang

2005, 18(5): 690-695.

[Abstract](1275)

Abstract:
To study the problem ofmonopoly in the electricity industry in China, a game theorymodel was designed according to the demand characteristics in the electricity market and by applying the theory ofmonopoly and regulation. The result indicates that the electricity producing companies have strong coll...

Dynam ic Pricing Policy of the SeasonalProducts Based on RevenueM anagement

GUAN Zhen-zhong, HUANG Shen-ze, SHIBen-shan

2005, 18(5): 696-699.

[Abstract](1570)

Abstract:
To gain maximum expected revenue, dynamic pricing policy of seasonal products was studied based on revenue managemen.t A continuous-time dynamic pricing model with customer reservation pricewasproposed. The optimal solutionwas obtained under the condition thatdemand is a Poisson process and reservat...

Multi-stage OptimalOrdering Strategy for theM anufacturer under Uncertain Prices

YANG Qing-ding, HUANG Pei-qing

2005, 18(5): 700-704.

[Abstract](1442)

Abstract:
To study multi-stage optimal ordering strategies for the manufacturer under uncertain prices, a stochastic netcash flowmodelwas proposed in view of themanufacturer. In themode,l it is assumed that the supply chain is composed of a single manufacturer and a single supplier from any country in theworl...

Incentive Entropy andW arningM echanism of Incentive System for Firms

XIAO Wen, LIShi-ming

2005, 18(5): 705-709.

[Abstract](1617)

Abstract:
According to the theory of system managemen,t the incentive system, a sub-system of firm system subordinates the law ofentropy increase. An incentive system produces incentive entropy during its operation, resulting in a decrease in incentive efficiency. Therefore, incentive entropy can be used asme...

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2005 Vol. 18, No. 5