Applied Mechanics and Materials Vols. 209-211

Abstract: The cell transmission model (CTM) is a potential simulation tool because it can accommodate all traffic conditions from light condition to oversaturated condition. This research aims to develop a traffic flow feature to improve the modeling of two-way arterials so that they are capable of modeling oversaturated conditions. Two improvements of the CTM are made to adequately study two-way arterials in oversaturated conditions. This enhanced model, proposed as the Conditional Cell Transmission Model (CCTM), is compared with Highway Capacity Software 2000 (HCS) in terms of travel speed. The consistency between the HCS 2000 and the CCTM show

Abstract: On the basis of analyzing and comparing with the existing road facilities in normal state, the traffic features in emergency and the design of redundancy, a method of planning and designing the traffic of urban road in emergency is put forward to solve the problem by switching the road facilities From normal state to emergency rapidly in a short time through some simple traffic organization and physical facilities instead of changing the road traffic facilities in the normal state so that the valuable resources of the road traffic in city can be made the most intensive use of both in normal state and in emergency

Abstract: The CBD demands that the street must occupy little space and has high efficiency. Based on the CBD’s traffic characteristics, this paper proposes a new idea that is called multilayer translocation road traffic system. Then the idea and implementation are put forward. The advantages and deficiencies show that the multilayer translocation road traffic system is favorable to the environment protection and is accord with green traffic. The concept will help the CBD’s planning, design and construction.

Abstract: The traditional research on vehicle routing planning was mostly on the assumption that link travel time is constant, but the traffic conditions in real road network are often fluctuant. In order to meet the requirements of fast and efficient delivery, it is necessary to study vehicle routing planning in dynamic transportation network. In recent years, time dependent vehicle routing problem (TDVRP) which considers traffic conditions attracted more and more scholar's attention. However, most studies on TDVRP are based on simple test network, and assumed all vehicles depart from the depot at a fix time. In this paper, we studied TDVRP based on floating car data. We gave a mathematical model for TDVRP, and represented the dynamic network as a first in first out (FIFO) network by time dependent function of travel speed. Then, we designed a routing construction algorithm named DTO-NNC algorithm for TDVRP. Moreover, we constructed a test instance of 100 customers based on floating car data in the road network of Shanghai, and solved it in the case of fixed departure time and variable departure time. Through the instance, DTO-NNC algorithm has been proven efficient in real road network.

Abstract: In recent years, Bayesian networks and neural networks have been widely applied to the travel demand prediction area. However, their prediction performance is rarely directly compared. By experimental tests conducted using the same dataset, a Bayesian network model and a neural network model are compared for the travel mode analysis for the first time in this paper. It is found that the fully Bayesian network model tends to overfit the training set when the network itself is considerable complicated. The TAN structure otherwise has a better generalization performance and can achieve a better and more stable prediction performance, for its prediction accuracy 75.4%±0.63%, compared to the BP neural network model ,which prediction accuracy is 72.2%±3.01%. Experiment and statistical tests demonstrate the superiority of Bayesian networks and we propose using Bayesian networks, especially TAN, instead of neural networks in the travel mode choice prediction field.

Abstract: The problems in connectivity of underground road system deepens the impact from disastrous emergencies. The more reliable connectivity calls for less time for emergency evacuation from underground road. Based on the summary analysis of urban underground road network, connectivity reliability is well defined and its calculation models are established in the article. Additionally, the evaluation is made of the reliability of different connectivity in different urban underground road system and the ways to improve are correspondingly recommended.

Abstract: Bus routes planning is the key to the design of public transport system, it determines the status of public transports at a large degree. For the existing bus network traffic problems, such as bus traffic is not balanced in both pace and time, flat-peak conversion is slow, non-linear coefficient is high. Therefore a circular bus network planning method is put out. The overall interests of passenger and bus operators are used as the objective function; the public transportation network technical indicators are used as the constraint conditions. When designing the network, the transfer coefficient and the line length are used for the control conditions. The main through passenger is satisfied at first, and the initial network is laid out by the circular line. Then the bus network is revised according to the constraints conditions with the status of the road network. From the different purposes, different option should be compared by the value of objective function, and the optimal one is gained at last.

Abstract: Based on the 1235 cases of data collected in the survey of Suzhou, a structure equation model is developed to evaluate how gender-role interactions occur in two levels: attribute-activity and activity participation itself. The results show that those two kinds of interactions between two household heads do exist and strongly affect each other’s subsistence, maintenance and leisure activity participations. Household attributes and children’s age are found to have different effect on male and female heads. It indicates that one important reason for male and female differ in activity-travel behavior is that they receive different interactions in household from counterparts. As expected, those results show that different TDM policies should be made aiming at women and men. It will help to better reflect the behavioral responses of household heads to changes in demographic characteristics and to get a deeper understanding of gender difference in activity behavior in developing countries.

Abstract: The Taiwan Occupational Safety and Health Management Systems (TOSHMS) and literature relevant to safety culture were used to sort out the influential dimensions in safety culture, establish a questionnaire framework for evaluating current safety culture, analyze four railway companies in Taiwan, and further investigate the current safety culture and the relationship between safety culture and occupational accidents. It was found in the investigation that significant percept ional differences existed in Health Activities, Safety Training, Safety Rule, Safety System, Safety Encouragement and Punishment, and Performance Measurement. From the analysis of safety culture and disabling injury frequency Rate（DIFR）, it is known that low DIFR does not ensure that risks are effectively controlled. It is thus known that the railway industry in Taiwan needs continuous improvement in terms of safety culture.

Abstract: The waterway of Jiangxinzhou to Wujiang section is the only hindering navigation section in Wuhu to Nanjing of the lower reaches of the Yangtze River. Because of the unsteadiness of the main stream, the navigation condition in this section tends to worse, in which the regulation work is sorely needed and more important. The major problem for channel regulation in this section is the design of regulation project. In this paper, the 2D numerical model for simulating the flow and sediment in the waterway of Jiangxinzhou-Wujiang section is used to analyze these questions. From the numerical simulation results, we know that the overall navigation regulation project can solve the problem of hindering navigation.