西南交通大学学报

Survey of the Selection of Kernels and Hyper-parameters in Support Vector Regression

XIAO Jian, YU Long, BAI Yifeng

2008, 21(3): 297-303.

[Abstract](2684)

Abstract:
The structure of support vector regression model plays an important role in simultaneously reducing both the empirical risks and confidence intervals.To make a systematical analysis,the existing typical methods for SVR model selection were classified into two major categories: kernel selection and h...

Effects of DC Control Strategies on DC Power Transmission System Stability

WANG Yuhong, LI Qunzhan, HE Xiaoqiong, GAO Shibin

2008, 21(3): 304-308.

[Abstract](1790)

Abstract:
DC(direct current) control strategy and its application in power transmission systems were analyzed,and constant current control(CCC) and constant power control(CPC) were compared in terms of their principles and implementation.Gao-Zhao(Gaopo in Guizhou to Zhaoqing in Guangdong) HVDC(high voltage DC...

Missile Guidance Law with Terminal Impact Angle Constraint

WU Peng, YANG Ming

2008, 21(3): 309-313.

[Abstract](1110)

Abstract:
The correlation between terminal impact angle and expected angle of sight was analyzed to ensure impact angle of a missile.A guidance law with a terminal impact angle constraint was proposed based on Lyapunov stability theorem and estimation about time-to-go.The proposed guidance law is simple and o...

Video Shot Detection Method Based on Wavelet Transform and Wavelet Entropy

DAI Xiaowen, CAI Zhiping, ZHONG Guiying

2008, 21(3): 314-318.

[Abstract](1716)

Abstract:
A detection method for video shot transitions based on wavelet transform and wavelet entropy was presented.The mean and standard deviation of the low frequency components of an image is used to detect cut transitions.To detect gradual transitions,the wavelet entropies of the image in horizontal,vert...

Experimental Research on Shear Behaviors of Specially Shaped RC Columns with Different Lengths of Limbs

HUANG Chengkui, QU Fulai, ZHAO Shunbo

2008, 21(3): 325-329.

[Abstract](1577)

Abstract:
Twelve model columns were tested under low reversed cyclic loading to investigate the shear behaviors of specially shaped RC(reinforced concrete) columns with different lengths of limbs.The effects of different factors,such as the length of limbs,the direction of horizontal force and the spacing of ...

Local Buckling of Extended End-Plate Connection in Fire

HAO Shuying, YANG Xiuping, YAO Bin

2008, 21(3): 330-334.

[Abstract](1472)

Abstract:
In order to reveal the effects of the thicknesses of end-plate and stiffener on the failure modes of extended end-plate connection in a fire,the formation conditions of one or two groups of plastic hinges in the tension zone of end-plates were investigated based on the elastic-plastic theory and val...

Centrifuge Model Test of Earthquake Countermeasures for Deposit-on-Slope

YANG Ming, YAO Lingkan, WANG Jian, YANG Qinghua

2008, 21(3): 335-340.

[Abstract](1789)

Abstract:
Based on the pseudo-static method,the reinforcement measures of anti-slide piles and their combination with anchor bolt frames were investigated with centrifuge model tests and numerical simulation in order to probe into the failure mechanism of deposit-on-slope reinforcement under an earthquake.The...

Effects of Expansive Agents on Deformation Property of CA Mortar

HU Shuguang, WANG Tao, WANG Fazhou

2008, 21(3): 341-345.

[Abstract](1706)

Abstract:
In order to maintain the volume stability of CA(cement asphalt) mortar,the effects of the type and dosage of expansive agents and curing humidity on the volume stability of CA mortar were investigated experimentally.The investigation results indicat that the expansion effect of aluminum powder occur...

Non-linear Creep Model Based on Plasticity Strengthening and Viscosity Weakening of Rock

LUO Runlin, RUAN Huaining, ZHU Changxing

2008, 21(3): 346-351.

[Abstract](1480)

Abstract:
To more reasonably describe the creep behavior of rock,especially the 2nd and 3rd stages of rock creep,a non-linear creep model of rock was established based on the creep mechanism of rock and introducing a plasticity strengthening function and a viscosity weakening function into the visco-plasticit...

Fracture Controlled Blasting of Different Coupling Mediums in Bore Hole

ZHU Zhiwu, LI Yi, SONG Shuncheng

2008, 21(3): 352-355.

[Abstract](1465)

Abstract:
Based on the different physical and energy transfer characteristics of water and air,coupling blasting of different mediums (water and air) in the same bore hole was presented to control the release process and action direction of energy to control the generation and development of cracks.The effect...

Surface Crack Problem of Half Space under Rolling Load

ZHU Chengjiu, CHEN Mengcheng, YU Huiqin

2008, 21(3): 356-360.

[Abstract](1592)

Abstract:
To simplify the calculations of wheel-rail contact force and governing equations,a surface crack problem in a semi-infinite space was reduced to solving a set of hyper-singular integral equations with displacement jumps as unknown functions.The boundary element method was used in numerical analyses ...

Coupling Dynamic Analysis of Vehicle and Turnout on Bridge

CHEN Rong, WANG Ping, CHEN Xiaoping

2008, 21(3): 361-366.

[Abstract](2355)

Abstract:
To research the vehicle-turnout-bridge dynamical interaction under a high-speed running condition,a dynamic model for a vehicle-turnout-bridge coupling system was established,and the numerical simulation method was applied to analyze the dynamic characteristics of turnout and bridge structures,the r...

Virtual Prototyping-Based Feedback Model of Product Design Process

DING Guofu, HE Yong, ZOU Yisheng, WANG Jue, ZHANG Weihua

2008, 21(3): 367-372.

[Abstract](1732)

Abstract:
In order to accelerate the convergence of a product design process towards the design object,a feedback model for product design processes was proposed.This model includes a product design model,an analysis model and a simulation model,and they are syncretized in a product design process.The propose...

Super-high Speed Curve Passing Performances of Vehicle with MRF Coupled Wheelsets

NI Pingtao, ZHANG Hong, WANG Kaiwen

2008, 21(3): 373-376,391.

[Abstract](1863)

Abstract:
In order to research the dynamic performances and running feasibility of a vehicle with MRF(magnetorheological fluid) coupled wheelsets at super-high speed,a spatial curve passing model for a holonomic vehicle with MRF coupled wheelsets and anti-hunting dampers was established based on the MRF bivis...

Influence of Primary Spring Stiffness on Strength of C0 Bogie Frame

ZHANG Kailin, LUO Huajun, ZHANG Hongjun

2008, 21(3): 377-380.

[Abstract](1537)

Abstract:
In order to determine the reasonalbe stiffness of middle-axle primary spring,the distribution of stresses in C0 bogie frame was investigated with FEM(finite element method) based on two kinds of boundary conditions,i.e.,spring constraint and force constraint.The influence of middle-axle primary spri...

Global Stability Analysis of Cohen-Grossberg Neural Networks with Unbounded Time Delays

LONG Lan, XU Xiaohui, ZHANG Jiye

2008, 21(3): 381-386.

[Abstract](2062)

Abstract:
In order to apply the neural networks to optimization problems,the conditions ensuring the existence,uniqueness and global asymptotical stability of the equilibrium point of Cohen-Grossberg neural networks(CGNN)with unbounded time delays were investigated.Without assuming the boundedness,monotone an...

Design of Direct-Connect Impulse Combustion Wind Tunnel

YANG Yang, LIU Weixiong, LE Jialing, WANG Jinnuo

2008, 21(3): 387-391.

[Abstract](1897)

Abstract:
To effectively and economically investigate the performance of supersonic combustors,a new kind of direct-connect impulse combustion wind tunnel was designed and constructed.It provides a high-enthalpy flow by combusting oxygen/nitrogen and hydrogen/nitrogen provided by a Ludwieg tube and a fuel-pro...

Multi-attribute Decision-Making Method Based on Design Axioms

WANG Xiaoyong, TANG Dunbing, LOU Peihuang

2008, 21(3): 392-397.

[Abstract](1570)

Abstract:
To overcome the objective conflicts of multi-attribute decision-making and reduce the complicacy of repetitive decision-making,a directed hierarchy model of multiple criteria analysis based on the independence axiom and an evaluation method based on the improved information axiom were presented thro...

Optimization of Passenger Station Layout in Railway Junction Terminal for High Speed Passenger Railway

WANG Nan, ZHU Zhiguo, HU Yan

2008, 21(3): 398-403.

[Abstract](3763)

Abstract:
Allocation of passenger stations in a railway junction terminal was categorize into centralized and distributed forms based on an analysis of the limitations to construction of new railway passenger stations.The allocation forms to be adopted depend on city scales,layout plan of existing railway ter...

Fast Optimization of Final Approach Sequence of Aircrafts

MOU Qifeng, WANG Ciguang

2008, 21(3): 404-408.

[Abstract](2129)

Abstract:
Dynamic programming method was used to solve the problem of optimal sequencing of aircrafts in final approaching.Criteria for fast judgment of priority between any two aircrafts in a queue were proposed.Based on these criteria and following the regulations of air traffic control(ATC),the parameters ...

Reverse Gravity Model Based on OD Traffic Flow of Air Passengers

LIU Xiaoming, XIA Hongshan

2008, 21(3): 409-414.

[Abstract](1741)

Abstract:
To estimate passenger traffic at airports based on air passenger OD(origin-destination) traffic flows and air route distances,a simplified algebraic algorithm was proposed with the help of Hamiltonian graphs.The parameters in the reverse gravity model were calibrated with the statistic data of 15 ma...

Dynamic Location Assignment of AS/RS Based on Genetic Algorithm

MA Yongjie, JIANG Zhaoyuan, YANG Zhimin

2008, 21(3): 415-421.

[Abstract](1873)

Abstract:
Optimal control objectives based on a stochastic storage strategy for an automated storage/retrieval system(AS/RS),in which some spaces are occupied,were defined as the assignment optimizations for the whole warehouse and locations in it,and that for travel time of storage/retrieval machines(SRMs).C...

Extraction Method for Traffic Information of Regional Road Network

JI Xiaofeng, LIU Lan, WU Qigang

2008, 21(3): 422-426.

[Abstract](1564)

Abstract:
To extract the traffic information of regional road networks,a method was proposed to identify traffic states using the matter-element analysis theory.In the method,traffic states are taken as decision attributes,a characteristic information table of traffic flows is constructed based on road grades...

Extraction and Counting of Partial Discharges under Pulse Voltage

ZHOU Kai, WU Guangning, HE Jingyan, LIU Jun, TONG Laisheng

2008, 21(3): 319-324.

[Abstract](1526)

Abstract:
The extraction and counting method for partial discharge(PD) under pulse voltage was proposed.dB6 and dB2 wavelet packages were used to filter high and low frequency interferences respectively based on an analysis on correlation coefficient between simulation signals and extracted signals.A phase wi...

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2008 Vol. 21, No. 3