西南交通大学学报

Damage Analysis of High-Rise Building under Seismic Load Based on Frequency Measurement

SHI Weixing, WANG Yang, LIU Chengqing

2007, 20(4): 389-394.

[Abstract](1736)

Abstract:
Based on the current methods of damage detection,a new detection model was proposed in order to search a more efficient detection method for reinforced concrete high-rise building damage induced by earthquake.This model is based on the regularity of change in the natural frequency of high-rise build...

In-situ Test on Engineering Application of New Thermal-Insulation Materials in Qinghai-Tibet Railway Subgrade

SU Qian, WANG Xun, LIU Shen

2007, 20(4): 395-399.

[Abstract](1595)

Abstract:
In order to investigate the engineering effect of expanded polystyrene(EPS) and expanded polyurethane(PU),an in-situ test was performed for permafrost subgrade on the Qinghai-Tibet railway.The results indicate that both the materials have a good thermal-insulation property,and the PU is better than ...

Model Test Investigation of Pile-Plank Embankment of Ballastless Truck for High-Speed Railway

ZHAN Yongxiang, JIANG Guanlu, NIU Guohui, WEI Yongxing

2007, 20(4): 400-403,408.

[Abstract](1896)

Abstract:
To study the dynamic performance of pile-plank embankment for high-speed ballastless track under a moving load,by taking Suiyu-Chongqing high-speed railway as the research object,a model test with a geometry scale of 1:12 was carried out.The test results indicate that after 10 000 times of vibrant l...

Three-Dimensional Expression of City Construction Based on Ontology

ZHANG Liguo, ZHAO Xuesheng, CHEN Jun

2007, 20(4): 404-408.

[Abstract](1170)

Abstract:
To overcome the difficulties in the appropriate partition and expression of spatial objects in the existing spatial description of city construction,the describable hierarchy and geometric definition of city construction were analyzed with the help of the basic theory of ontology—part-whole relation...

Dynamic Monitoring of Land Use Changes Based on Integration of RS,GIS and GPS

ZHENG Zezhong, FAN Dongming, YANG Wunian, CAO Yungang

2007, 20(4): 409-413.

[Abstract](1534)

Abstract:
To improve the reliability and precision of land use dynamic monitoring based on RS(remote sensing) and GIS(geographic information system),a method based on the integration of RS,GIS and GPS(globe positioning system) was given.Firstly,land use and land cover changes were interpreted in the light of ...

Automated Detection of Permanent Scatterers in Time Serial Differential Radar Interferometry

LUO Xiaojun, HUANG Dingfa, LIU Guoxiang

2007, 20(4): 414-418.

[Abstract](1296)

Abstract:
In order to effectively detect permanent scatterers(PSs) in time serial differential radar interferometry,a method,named amplitude information dual-threshold approach(AIDTA),was proposed based on the characteristics of strong reflection and stable backscattering of PS to radar waves.With this method...

Improvement to Ill-Conditioned Two-Dimensional Vehicle Collision Models

ZHANG Jian, LI Jiang, NI Xingda

2007, 20(4): 419-424.

[Abstract](1447)

Abstract:
Matrix perturbation theory was applied to analyzing the ill-conditioned two-dimensional vehicle collision model.The analysis shows that the ill-condition is caused by the linear correlation between some equations in the model.The linear correlation was solved by a mathematical transform to get new e...

Comparison on Track Spectra of Qinghuangdao-Shenyang Passenger Railway Line and German Railway Line

WANG Kaiyun, ZHAI Wanming, CAI Chengbiao

2007, 20(4): 425-430.

[Abstract](1755)

Abstract:
The track spectra of Qinhuandao-Shenyang(QS) passenger railway line and German railways were compared in terms of power spectrum density(PSD),amplitude of time domain samples and dynamic performance.The PSD of the QS ballastless track(QSBLT) falls between those of German railway spectra of high irre...

Application of Vehicle-Track Coupling Dynamics to Study on Settlement of Railway Tracks

GAO Jianmin, ZHAI Wanming

2007, 20(4): 431-435.

[Abstract](1662)

Abstract:
Dynamic characteristic of track settlement was investigated by combining the vehicle-track coupling vibration model and the track settlement model,and the dynamic response parameters of track structure and the irregularity in the vertical profiles of track were taken as a connection between the two ...

Reconstruction of State Space of the Trolley-Load Dynamic System in Overhead or Gantry Cranes

ZHONG Bin, CHENG Wenming, MA Lili, WU Xiao

2007, 20(4): 436-441.

[Abstract](1479)

Abstract:
A full-state observer was designed to obtain swing angle,swing angle-velocity and the other system state variables.The differences of the observed outputs of the state observer from those of the trolley-load system are calculated first,and these differences are sent to the feedback input after adjus...

Evaluation of Effect of Advection Term in Simulation of Mould Filling by Explicit Algorithm

CHENG Zhiqiang, Barriere T, LIU Baosheng, Gelin J C

2007, 20(4): 442-446.

[Abstract](1626)

Abstract:
To evaluate the effect of an advection term in the Navier-Stokes equation in simulation of the viscous injection flow,the advection term was added in the software that is based on vectorial explicit algorithm.Two typical examples were chosen to test the results of simulation,which were then compared...

In Situ Determination of Micro-properties of Tungsten Alloy Matrix

LIU Xiaoling, SONG Shuncheng, HUANG Wei, SHI Honggang

2007, 20(4): 447-451.

[Abstract](1338)

Abstract:
To obtain the micro-properties of tungsten alloy matrix,its micro-hardness and micro-elastic modulus were measured by nano-indentation experiments.The micro-yield strength,micro-hardening modulus,elastoplastic parameters and the stress-strain relationship of the tungsten alloy matrix were determined...

Intelligent Fire Alarm System Based on MSA System

JIA Nian, LUO Xiaohui, CHENG Huayou

2007, 20(4): 452-455.

[Abstract](1517)

Abstract:
An automatic fire alarm system based on MSA(multi-step-alarm) was proposed to overcome the shortcomings of a conventional fire alarm system composed of single type sensors.The proposed system integrates the signals from all fire alarm sensor by a multi-sensor data fusion system that is based on an B...

Adaptive Video Watermarking Scheme for Effective Resistance to Linear Collusion in Spatial Domain

LIU Li, PENG Daiyuan, LI Xiaoju

2007, 20(4): 456-460.

[Abstract](1356)

Abstract:
A mathematical model was established to solve the problem of linear collusion attacks in video watermarking.From this model,the design rules of video watermarking for resistance to linear collusion were put forward.In addition,an adaptive video watermarking algorithm for effective resistance to line...

Conspiracy Attack Immune(t,n) Threshold Signature Scheme with Traceability

ZHANG Wenfang, HE Dake, WANG Hongxia, WANG Xiaomin

2007, 20(4): 461-467.

[Abstract](1113)

Abstract:
A novel conspiracy attack immune(t,n) threshold signature scheme with traceability was proposed to overcome the weaknesses of the Wang-Li scheme and the improved Xie-Yu scheme.The security of this scheme was analyzed,and a comparison between efficiencies of the proposed scheme and the two schemes wa...

Fast Reduction for Large-Scale Training Data Set

LUO Yu, YI Wende, HE Dake, LIN Yu

2007, 20(4): 468-472,489.

[Abstract](1419)

Abstract:
In order to cut down the time of training a large-scale data set by using SVM(support vector machine),a fast algorithm for reducing training sets was proposed based on class centroid.With this algorithm the most of non-support vectors are removed in the light of the geometrical distribution of sampl...

Web Content Extraction Based on Multiple Strategies

GAO Yan, GU Shiwen, TAN Liqiu

2007, 20(4): 473-477.

[Abstract](1315)

Abstract:
In order to filter the noise in a web page,a new multi-strategy algorithm to extract the contents of a web page was proposed.With this algorithm,the granularity in different areas of the block tree of a web page established by the improved VIPS(visual based page segment) algorithm is controlled by d...

Quantum Fluctuations of Mesoscopic Double Resonance Circuit with Mutual Inductance and Capacitance-Inductance Coupling

XU Xinglei

2007, 20(4): 478-483.

[Abstract](1442)

Abstract:
A mesoscopic double resonance circuit with mutual inductance and capacitance-inductance coupling was quantized using canonical quantization method.The Hamiltonian of the system was diagonalized by unitary transformation to obtain the eigenenergy spectra of the circuit.The quantum fluctuations of the...

Digital V2 Control of DC-DC Switching Converters Based on Leading-Edge Modulation

HE Mingzhi, XU Jianping, WU Songrong

2007, 20(4): 484-489.

[Abstract](1431)

Abstract:
In order to accelerate the development of digital control technique,a digital V2 control algorithm based on leading-edge modulation was proposed by introducting the blocks of digital controller and the theory of V2 control,and the principle of eliminating the sub-harmonic oscillation was investigate...

New Algorithm for Inrush Current Identification of Transformer Based on Support Vector Machine

HAO Wenbin, LI Qunzhan, HUANG Yongrong, HAN Zhengqing

2007, 20(4): 490-493.

[Abstract](1558)

Abstract:
In order to improve the ability of transformer differential protection,a new algorithm based on SVM(support vector machine) was proposed for the identifications of inrush current and internal faults of transformers by using the pattern recognition function of SVM for inrush current identification.Ba...

Improved Support Vector Regression and Its Application to Prediction of Railway Passenger Traffic Volume

XIA Guoen, JIN Weidong, ZHANG Gexiang

2007, 20(4): 494-498.

[Abstract](1605)

Abstract:
To improve the prediction abilities of the present methods for railway passenger traffic volume,support vector regression(SVR)was improved by weighting penalty coefficients using Mahalanobis distance between training and testing samples,and a model for predicting the time serial of railway passenger...

Compact Layout of Logistics Facilities Based on O-Tree Representation

TANG Yinying, PENG Qiyuan, SHI Yufeng

2007, 20(4): 499-504.

[Abstract](1587)

Abstract:
A representation for compact layout of logistics facilities based on an O-tree(ordered tree) was proposed following the approach for design of very large integrated circuit.On the basis of O-tree representation,an algorithm to obtain an optimum in area utilization ratio was developed according to th...

Weight Integration Method without Preference on Multi-attribute Decision Making

GUO Hongling, HUANG Dingxuan

2007, 20(4): 505-510.

[Abstract](1441)

Abstract:
To overcome the shortcomings resulted from the preferred integration between subjective and objective weights in multi-attribute decision-making with condition and decision attributes,a quadratic programming model was proposed to get optimal weight integration without preference between the subjecti...

Civil Aviation Decision Support System for Early Warning of Disasters Based on Data Warehouse and Online Analytical Processing

LI Ke

2007, 20(4): 511-515.

[Abstract](1336)

Abstract:
An early warning decision support system for civil aviation disasters was constructed based on data warehouse and online analytical processing(OLAP) to utilize the data from multiple sources and to provide a support to multi-objective decision making.The system includes 5 layers: application interfa...

Pilot-Scale Experiment of Semi-Aerobic Landfill in Different Climate Conditions

ZHA Kun, LIU Dan, LI Qibin, YANG Qiaoyan

2007, 20(4): 516-520.

[Abstract](1373)

Abstract:
To verify the applicability of semi-aerobic landfill in different climate conditions,the degradation of municipal solid waste in pilot-scale semi-aerobic landfill was investigated experimentally respectively under tropical and plateau climate conditions.The experimental results show that under highe...

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2007 Vol. 20, No. 4