Applied Mechanics and Materials Vols. 209-211

Abstract: GIS technology becoming mature lays a foundation of the implication of GIS in transportation domain. This article mainly designs the structure and function of system according to analyzing of the needs of the users. It uses Delphi, Mapx and SQL Server technology to realize Coping Disposal System for Incident Suddenly Occurring on Freeway Based on GIS. Thus it visual does the effective real-time management to the sudden event of each regional. And it improves the processing power to the sudden event.

Abstract: In this paper we consider a capacitated single allocation p-hub median problem with direct shipment (CSApHMPwD). We determine the location of p hubs, the allocation of non-hub nodes to hubs, and direct shipment paths in the network. This problem is formulated as 0-1 integer programming model with the objective of the minimum total transportation cost and the fixed cost associated with the establishment of hubs. An optimal solution is found using CPLEX for the small sized problems. Since the CSApHMPwD is NP-hard, it is difficult to obtain optimal solution within a reasonable computational time. Therefore, an ant colony optimization algorithm is developed which solves hub selection and node allocation problem hierarchically. Its performance is examined through a comparative study. The experimental results show that the proposed ant colony optimization algorithm can be a viable solution method for the capacitated hub and spoke network design problem.

Abstract: The objective of this paper is to investigate genetic algorithms (GA) on traffic signal timing at a congested isolated intersection. The objective function for GA modeling was established on the strategy of minimizing average delay and GA was applied to search for the optimal signal timing. Then microsimulation is used to compare the optimized timings produced by the GA with those obtained for the same intersection using Synchro. Results indicated that applying GA results in lower values of average delay and average number of stops in congested condition than applying Synchro.

Abstract: The total engineering geology approach is applied to a roadway pilot project in the tidal deposits of the Western Netherlands.Its benefit as compared to the conventional geotechnical site investigation is demonstrated.Combining laser scanner altimetry data that is readily available to low cost GEM-2 electromagnetic surveys, allows for the refinement of the local geological model. Small and large scale heterogeneities have been detected in this study. Their existence has been confirmed by a line of closely spaced CPTs. On the basis of laser altimetry and GEM-2 signature, the identified heterogeneities are classified. Only a limited set of heterogeneities representative of the different classes requires a further detailed investigation. Aspects of feasibility, accuracy, and cost-effectiveness have a need for further research.

Abstract: In order to improve the safety of road hazardous goods transportation and decrease the accidents, the management process of hazardous goods transportation is taken as the main research object in this paper. The fault tree is established to seek out the primary factors influencing on the hazardous goods transportation on road, and the safety proposals are presented.

Abstract: First give the basic theory of entropy and application fields of entropy. Second, analyze the reason of the fatigue phenomenon of the motor train set crew, on this basis, put forward the equilibrium indexes of train crew scheduling plan based on entropy theory, and establish the corresponding index model and calculation method. At last give the calculating formula of equilibrium of train crew scheduling plan, use it as a measure to know whether the train crew are fatigue, and then it can solve the problem that train crew are easily fall fatigue. The example shows that the method is scientific and applicable, and provide the reference for the making of the train crew scheduling plan in future.

Abstract: In order to evaluate traffic operation status of unsignalized intersection on arterial road in slight snowy weather, it was studied that the influence of slight snow on capacity of unsignalized intersection. Critical gap and following headway data of one unsignalized intersections were observed by video method. And gap accepting theory was adopted to calculate the capacity of unsignalized intersection. An example was given for calculating the capacity of an unsiglized intersection on normal pavement and slight snowy pavement. It showed that capacity of unsignalized intersection in slight snowy weather decreased by 11.26% compared with on sunny weather.

Abstract: The brake model derivation based on the kinematics of the stopping sight distance analysis, considering the freeway visibility and road surface friction coefficient, put forward freeway safety speed calculation model in snow condition, reach maximum safe speed of snow freeway in a different visibility and road adhesion coefficient snow condition, provide a management reference for freeway snow driving safety.

Abstract: To evaluate and compare the safety level of alternative plans prepared for a towing activity that bears various risks, a novel assessment framework is worked out for inshore towing operations for heavy cargo. The assessment framework mainly includes a set of criteria with hierarchical structure drawn from towing plans and evidential reasoning theory as data aggregation approach. Case study shows that the framework is rational and applicable in the safety assessment of inshore towing operations.

Abstract: With the increase in rail inspection technology, the whole rail profile can be measured by rail inspection cars or some typical static measurement instruments. Based on a large number of practical rail profile measurements, a whole rail profile auto-matching method is put forward to enhance the efficiency and accuracy of data analysis. An analytical tool applying this method is developed at the same time and the principle and calculation method of the tool will be introduced. Apart from this, data collected from in-situ measurements taken on line 2 of the Shanghai Metro will be performed and analyzed to verify this method. The main contributions of this paper are the generalization of an efficient analytical tool for the calculation of wear parameters at both specific and non-specific points and the practical application for comparison of data collected by both dynamic and static inspection with the standard, which proves that the method is correct and effective.