西南交通大学学报

WANG Paul P

2003, 16(3): 245-247.

[Abstract](1252)

Abstract:
Chinese language is one of the oldest and most popular languages in the world, rich in semantics. A computer can perfectly work with Chinese. Computing with words can be and should be applied to Chinese language in ordertogain evenmore utilityvalue. Fuzzy logic provides an effective means tomodeling Chinese language. It is now a great time for researers to put more efforts to the study on computingwith Chinese, and investors will get huge commercial opportunities in the development of the theory and technology.

Automated ReasoningMethod Based on Path Searching for Lattice Propositional Logic Formulae

2003, 16(3): 248-252.

[Abstract](1179)

Abstract:
A new automated reasoning method based on path searching is put forward. This method adopts pre-processing and dynamic deletion strategies so as to convertmulti-path searching into one-path searching. It can be used to validate the unsatisfiability of lattice-valued propositional logic formulae quickly. In addition, the soundness and completeness of the method are proved.

Reliability of Warm Standby Repairable System under Two Kinds of Switch Modes

PENGJiang-yan, HEPing

2003, 16(3): 253-257.

[Abstract](1498)

Abstract:
The reliability of a warm standby repairable system, composed ofnidentically distributed components and repair equipment, is discussed. Under the conditions that the lifetime and repaired time of the components and the switch in the system are subject to exponential distributions and all variables are mutually independent, two models are set up respectively for two situations that the systemfails immediately or notwhen the switch fails. Fromthe homogeneousMarkov process, the transition probability of the system is determined. And the reliability of its mean lifetime and the first failure time forn=2 are obtained. Finally, the results obtained from the two models accord with the present ones under some special conditions.

Analysis of Data Validity in SimulationModel Validation

YANGJiang, LI Zhi

2003, 16(3): 258-262.

[Abstract](1575)

Abstract:
The analysismethods of data validity in simulationmodel validation are presented. The statistical analysis, such as the Grubbs criterion and thettest criterion, can be used for validation ofmeasured data, while the non-statistical analysis, such as the entropy discrimination method and the gray theory discrimination method,should be adopted under the condition that the number of samples is small and the distribution is unknown. Finally, examples are given to illustrate the use of these methods

Research of Remote Monitoring System Based on Embedded Web

LIHeng-chao, ZHANGJia-shu

2003, 16(3): 263-266.

[Abstract](1167)

Abstract:
Based on the analyses of the shortcomings of traditional remote monitoring systems and the advantages of Web technique applied to remote monitoring, two kinds of Web remote monitoring schemes based on the agent and the embedded system are discussed. In addition, the design and implementation of an embedded Web remote monitoring system with an 8-bit high-speed microprocessor as its core are presented.

Computer Transmission and Processing of Medical Images

HE You-quan, FANGLei

2003, 16(3): 267-270.

[Abstract](1296)

Abstract:
The structural modes of the picture archiving and communication system (PACS) of medical images based on the DICOM3.0 standard are discussed. The design of the system is based on the principles of phase development and stratified structure. As an example, the processing of digital images is performed at different network stations. The research shows the feasibility of development of PACS in China.

Spatial Object Boundary Index Based on Wide Grids

LUO De-an, LIAOLi-qiong

2003, 16(3): 271-275.

[Abstract](1533)

Abstract:
Through the analyses of the grid index and the spatial object index, a structure of the spatial object boundary index based onwide grids is put forward. The principle, data storage form and construction of the index structure and its use in spatial query are discussed. In addition, its validity and feasibility are proved. The proposed index can reduce the data to be stored and time spent on spatial query, raise the efficiency and precision of spatial query markedly.

Analysis of Dynamic Characteristic Parameter of Air Spring

LIFu, FUMao-hai, HUANG Yun-hua

2003, 16(3): 276-281.

[Abstract](1978)

Abstract:
Based on the theories of thermodynamics and hydrodynamics, a physical model for air springs is established, its uniform mathematical expression is deduced, and the method of determining air spring parameters is put forward. And the factors affecting the dynamics of air springs are analyzed. The results showthatshape ofthe air cell, properties ofthe material, volume ofthe appended gas chamber and diameter of the throttle hole are main factors affecting the dynamics of air springs.

Research on Geometrical Curve Negotiating of Three-Truck Maglev Vehicle

ZENG You-wen, WANG Shao-hua

2003, 16(3): 282-285.

[Abstract](1429)

Abstract:
By taking three-truck maglev vehicle as an example, the kinematics lawof maglev vehicles on a curved track is investigated. The mathematical expression of geometrical relation negotiating is deduced on the basis of the supposition of electric magnetic guide force equilibrium, and an approximate formula convenient for use in engineering is presented.

Bogie Structures of Speed-Rising Freight Cars

LIUZhuan-hua

2003, 16(3): 286-289.

[Abstract](1439)

Abstract:
The structures and properties of Z8AG, Z8G and ZK2 bogies, as well as the problems often encountered in their operation, are analyzed. It is pointed out that the traditional three-piece bogies cannot be applied to the speed-rising of freight cars. The bogies suitable for the purpose must meet the following basic demands: the maximum running speed is at least 120 to 130 km/h, and the wearing rate and wheel/ rail contact stresses should not be larger than those of the traditional bogies.

Genetic Algorithms for Period-Double Bifurcation of Logistic Mapping

FENG Chun, CHEN Yong

2003, 16(3): 290-293.

[Abstract](1688)

Abstract:
A newmethod of accurately computing the bifurcation of a chaotic dynamic system is proposed based on the genetic algorithm(GA). AGAmodel for period-double bifurcation is set up from the dynamic characteristic of a dynamic system at a bifurcation point. The logistic mapping is used to demonstrate the effects of the proposed method. The numerical simulation result shows that this method is exact and a shortcut to chaos.

Fatigue Reliability of Notched Parts from Viewpoint of Structural System

JINHui, WANGJin-nuo

2003, 16(3): 294-296.

[Abstract](1439)

Abstract:
The numerical differentiation and finite element methods are applied to determine partial derivatives, and the method of calculating the fatigue reliability of notched parts under even loads is given.

Sensitivity Analysis of Time-History Reliability of Reinforced Concrete Frames under Frequent Earthquakes

ZHANGXin-pei, CHEN Ying

2003, 16(3): 297-300.

[Abstract](1699)

Abstract:
The sensitivity of the time-history reliabilities of the anti-lateral displacement capacity of a reinforced concrete (RC) frame and the load-bearing capacity of its elements to its structure parameters under frequent earthquakes is analyzed using the time-history reliability algorithm. In addition, the effect of the correlation coefficient of seismic acceleration, as a random variable, on the time-history reliability is discussed. The result shows that changes in the section size of beams and columns, the mass of a storey, the ratio of reinforcement and the strength of steel bars have a great effect on the time-history reliabilities of the load-bearing capacityof beams and columns of aRCfarme, while the variations ofthe elastic modulus of RC, the section size of beams and columns and the ratio of damping will influence the time-history reliabilities of the anti-lateral displacement capacity of RC frames.

Simulation Model for Crowd Evacuation Based on Agent Technology

XUGao

2003, 16(3): 301-303.

[Abstract](1369)

Abstract:
Based on the existing evacuation simulation models, a building emergency evacuation simulation model is developed using the agent technology. With different parameter values, this model can be used to simulate evacuation dynamics under different environmental and the psychological states of crowd, including their knowlege of the environment and levels of panic. Compared with the existing models, this model is more flexible, making its simulation results more realistic.

Research on Forming Mechanism of Inchoate Cracks in Cement Concrete Pavement

WUGuo-xiong, YAOLing-kan, YI Zhi-jian

2003, 16(3): 304-308.

[Abstract](1486)

Abstract:
To provide a new method of the design and calculation of concrete pavement,based on the characteristics of the interface between the surface and base of cement concrete pavement, the forming mechanism of inchoate cracks in concrete slab is analyzed, tensile stress resulted from base restriction to concrete shrinkage is calculated by using the existing model, and its effect on inchoate cracks in cement concrete pavement is discussed. Furthermore, the effect of conerete inchoate cracks on the performance and fatigue life of concrete pavement is investigated using the fracture mechanics principle.

Lateral Stability of Parabolic Double-Rib Arch under Non-Directional Loads

YANG Yong-qing, PUQian-hui

2003, 16(3): 309-313.

[Abstract](1306)

Abstract:
A parameterized practical calculation method is proposed to investigate the lateral stability of a parabolic double-rib arch under non-directional loads. The effects of structural parameters on the lateral stability are analyzed. The research shows that due to the action of non-directional loads, the critical lateral stability load increases remarkably for a through-arch and decreases evidently for an upper loading arch, and that the stiffness of lateral bracing, the ratio of rise to span and the lateral rigidity of a deck system have a great effect on the critical load.

Finite Element Analysis of Stress in Rail Joint

YANG Rong-shan

2003, 16(3): 314-317.

[Abstract](1476)

Abstract:
A three dimensional calculation model of rail joint is proposed using finite element software ANSYS. The effect of bolt torque on stresses in rail, joint bars and track bolts in a rail joint is analyzed. The calculation results showthat reasonal bolt torque ranges from 600 to 700 N·m for a common joint and 900 to 1 000 N·m for a“frozen”joint.

Determination and Numerical Analysis Method of Relaxation Region for Cutting Slope

XIAO Shi-guo, ZHOUDe-pei

2003, 16(3): 318-322.

[Abstract](1309)

Abstract:
Slope instability is related tothe relaxation region caused byslope cutting. It is very importantto properly determine the relaxation region when a cutting slope is remedied. From the theoretical results of stress analyses for a cutting slope, it is pointed out that the stress and displacement of the slope become smaller and smaller away from the slope surface. The concept of relaxation region is given. It can be determined based on the stress or displacement curves for different reference lines horizontal or parallel with the ground line on the slope top. In addition, the numerical analysis flow chart is given, and by taking a practical project as an example, the way to determine the relaxation region is explained.

Centrifugal Model Tests for Settlement of High Embankment

LIUHong, ZHANG Zhuo-yuan, HANWen-xi

2003, 16(3): 323-326.

[Abstract](1476)

Abstract:
By taking an airport in the southwest of China as an example, a group of centrifugal model tests are carried out to investigate the deformation characteristics of high embankment. The research results show that great settlement and fast compression are the main characteristics of high embankment for the soil used in the tests, above 90% of settlement occurs during the construction, and below 10% after the construction.

Experimental Investigation of Fluctuating Pressure on Macao Handover Ceremony Hall

WUTai-cheng, QIANG Shi-zhong, CHENDong-hong

2003, 16(3): 327-331.

[Abstract](1366)

Abstract:
The method and result for the fluctuating pressure wind tunnel test of the Macao Handover CeremonyHall are introduced, and the distribution characteristics of fluctuating pressure on the wall and roof surfaces and its influential factors are analyzed. The experimental results showthat the upper surface of the hall’s roof is mainly loaded by suction, it is comparatively big on cantilevered edges, and the regularity of pressure distribution ismarkedly disturbed bynearbybuildings. The distribution of fluctuating pressure on the lower surface of the hall’s roof is similar to that of fluctuating pressure on the wall surfaces. The inner pressure is largely related to the wind directions and the fact thatwhich door is open.

Research on Design of Train Diagram-Making System of Railways in China

NIShao-quan, L Hong-xia, YANGMing-lun

2003, 16(3): 332-335.

[Abstract](1526)

Abstract:
The short-and long-term goals of constructing the train diagram-making system of railways in China are put forward. Ageneral structure of this system based on the two levels of the Ministry of Railway and railway bureaus is proposed, and its functions and implementation approach are discussed. An idea of train diagram-making is advanced. That is, the train diagramdatabase of railways in Chinamaybe setup on the basis of railway bureaus’and sub-bureaus’databases, sections should be used as the basic description unit in the design of databases, and single and double track railways oughtto be considered atthe same time in train diagrammaking. In addition, the key techniques of the system design such as the organization of data, the design of data structure, the solution of diagram-making algorithm and the design of man-machine interaction functions are discussed.

Game Model of Selection of Competitive Transportation Corridors

ZHUJian-mei

2003, 16(3): 336-340.

[Abstract](1458)

Abstract:
The research on its principle and the character of the problem discussed shows that the game theory may be applied to the selection of repetitiveness transportation corridors. Through the mathematic description ofthe corridors’selecting, itsgame model is setup, and the algorithmforthismodel isgiven on the basis ofthe interated elimination of strictly dominated actions. In addition, the settingup ofthe players’ set, the number of the Nash equilibrium and the expansion of the model are analyzed. Finally, by comparingwith AHP, the possibility to expand this model to the Bayesian game model is discussed.

Model for Vehicle Routing Plan with Mixed-Demand and Its Lasso Solution

YE Zhi-jian, DUWen, ZHOUHe-fang

2003, 16(3): 341-344.

[Abstract](1501)

Abstract:
When customers have a mixed demand for delivering and fetchinggoods, the solution can not be obtained using the traditional TSP (travelling salesman problem) algorithms because of the restraint of the demand for delivery and fetching and the capacity of vehicles. To solve this problem, a model of customer subset distribution is set up. Based on the customer subset distribution, the lasso solution is proposed to select the route with the minimum distribution cost.

Two-Level Genetic Optimization of Production Planning and Scheduling in Multi-machine Group Production System

ZHOUGuo-hua, ZHAO Zheng-jia

2003, 16(3): 345-348.

[Abstract](1479)

Abstract:
Based on an optimal model of production-amount and job sequencing of a two-stage group production system, amathematic model forturnout and job sequencingwithmulti-product andmulti-machine is proposed. In accordance with the feature of the proposed model, it is solved with a two-level genetic optimization method that combines binary-coding and order-coding. An example is presented, and the simulation result verifies the efficiency of the method.

Discussion on Structure of Management Information System of Modern Logistic Base

XIAOLiang, SHENZu-zhi

2003, 16(3): 349-353.

[Abstract](1330)

Abstract:
On the base of defining the logistic base, four strategic goals of the management information system of a modern logistic base are brought forward. They are to protrude the centralizing effect of enterprises, improve the level of logistic services, optimize the deploying of logistic resources and respond immediately to the logistic demand of customers. The functions needed to the MIS to realize the strategic goals is deeply discussed, and a new system structure, including the decision and operation layers of informationwindows and the operation and application layers of enterprises, is put forward. At last, the structure of the management information system and the function design of the logistic public information window are deeply discussed.

Research of Project Schedule Based on Group Decision

LUO Yi-zhi

2003, 16(3): 354-358.

[Abstract](1438)

Abstract:
Based on the implication and role of a project schedule and the analysis of unsolved problems, the GAHP model is used to determine the weight of evaluation indexes from four administrative levels, and the fuzzy comprehensive evaluation is utilized to evaluate a project. The above mentioned methods are applied to the schedule operation of a concrete project. The calculation result obtained by using the methods is accordance with the real schedule basically, and the reasons for the difference between the two and the factors influencing the project schedule are discussed.

Static Game Model of Incomplete Information

HANLing, ZHAOLian-wen

2003, 16(3): 359-362.

[Abstract](1431)

Abstract:
The traditional game theory is based on the assumption that all the players have full knowledge. This assumption, however, can notbe usuallymet in practice because ofthe incompletion of information and the difference between ways used by the players to acquire information. As a result, the static game with incomplete infromation should be discussed. According to the epistemic utility theory, the static game with incomplete information is discussed. Based on the hypothesis that each player only knows the set of the distribution of other players’type, a static game model of incomplete information is set up by applying the quasi-Bayesian theory.

Signaling Game of the Chinese Security Market Structure after the Introduction of QFII System

ZHOUJie, WANGXing-yu, YAOHong-xin

2003, 16(3): 363-366.

[Abstract](1265)

Abstract:
Based on the analysis of the structural changes to be resulted from the introduction of QFII into China, the signaling game model forQFII and DII (Domestic Institutional Investors) is proposed. With the strong abilities to analyze security markets, abundant information and finacial resources, QFII will become the leader in the Chinese security market. Under the influences of QFII, the investment philosophy of Chinese investors will change from fund driven to value driven.

Analysis of Option Pricing with Game Theory

ZHANG Cai-yu

2003, 16(3): 367-370.

[Abstract](1304)

Abstract:
The principle of option pricing is difficult to understand because derivation of the Black-Scholes formula needs the knowledge of complicated partial derivation. To make it simple, trading of options is regarded as a game, and option pricing becomes calculation of the expectation value of a share during the trade. The variation of the price of a share is an infinite random process. Therefore, the expectation value can be obtained through calculation of the distribution function of the random process.

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2003 Vol. 16, No. 3