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排序方式: 共有876条查询结果,搜索用时 140 毫秒
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This paper investigates the relationship between the dwelling time of trains and the crowding situations at Mass Transit Railway (MTR) stations in Hong Kong. Regression models were established for the dwelling delays of trains due to congestion at stations, and a simulation model making use of the Monte-Carlo technique is developed to assess the reliability of the estimated train dwelling time. Therefore, the distribution and the confidence interval of the train dwelling time can be predicted on the basis of observed boarding and alighting distributions. 相似文献
243.
Wayne K. Talley 《Transportation Research Part B: Methodological》1983,17(4):319-331
This paper considers costing criteria to evaluate various single capacity and alternative capacity rules for allocating shared costs among transportation movements (i.e. determining fully allocated costs). The costing evaluation criteria are: (1) core allocations, (2) encourages internally efficient capacity decisions, (3) fairness, and (4) low computation costs. The principal conclusion of the paper is that alternative capacity rules for allocating shared-capacity costs among transportation movements are generally superior to single capacity rules that have been used by the Interstate Commerce Commission. 相似文献
244.
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246.
Analytical Tire Models for Dynamic Vehicle Simulation 总被引:4,自引:0,他引:4
K. M. Captain Manager A. B. Boghani Program Manager D. N. Wormley Professor of Mechanical Engineering 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1979,8(1):1-32
Four basic tire models suitable for dynamic vehicle simulation are formulated. The models are compared through a six-degree-of-freedom nonlinear simulation of a cargo truck crossing rough ground. Guidelines are developed for the selection of an optimum tire model for a given dynamic vehicle simulation. 相似文献
247.
D. K. Y. Chu 《Maritime Policy and Management》1979,6(4):293-303
Projections of the future traffic demand of British seaports are of great importance to port management bodies because of the huge capital investment required for installing modern port facilities. In this paper, the author uses a first order Markov Chain model to forecast the non-fuel cargo traffic demand of the major British seaports in 1980 and 1985. 相似文献
248.
A model for assessing the effects of dynamic travel time information via variable message signs 总被引:2,自引:0,他引:2
In view of the serious traffic congestion during peak hours in most metropolitan areas around the world and recent improvement
of information technology, there is a growing aspiration to alleviate road congestion by applications of electronic information
and communication technology. Providing drivers with dynamic travel time information such as estimated journey times on major
routes should help drivers to select better routes and guide them to utilise existing expressway network. This can be regarded
as one possible strategy for effective traffic management. This paper aims to investigate the effects and benefits of providing
dynamic travel time information to drivers via variable message signs at the expressway network. In order to assess the effects
of the dynamic driver information system with making use of the variable message signs, a time-dependent traffic assignment
model is proposed. A numerical example is used to illustrate the effects of the dynamic travel time information via variable
message signs.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
249.
K. Obeng 《Transportation》2011,38(2):191-214
This paper uses an indirect production function to decompose the effects of subsidies on output into the lump-sum, cost and inefficiency effects. Using 2006 data for U.S. transit systems it estimates an indirect production function and uses the results to calculate these effects. It finds that the lump-sum effects exceed the other effects and that the average total effect of the subsidies is a 4.72% increase in output. The range of the output change shows that in many transit systems the output increases from the subsidies are quite large. The paper suggests that reductions in allocative inefficiencies from the subsidies would result in very large increases in output. 相似文献
250.
On the numerical accuracy of the wave load distribution on a ship advancing in short and steep waves
Satu K. Hänninen Tommi Mikkola Jerzy Matusiak 《Journal of Marine Science and Technology》2012,17(2):125-138
Defining numerical uncertainty is an important part of the practical application of a numerical method. In the case of a ship advancing in short and steep waves, little knowledge exists on the solution behaviour as a function of discretisation resolution. This paper studies an interface-capturing (VOF) solution for a passenger ship advancing in steep (kA = 0.24) and short waves (L w /L pp = 0.16). The focus is to estimate quantitative uncertainties for the longitudinal distributions of the first–third harmonic wave loads in the ship bow area. These estimates are derived from the results of three systematically refined discretisation resolutions. The obtained uncertainty distributions reveal that even the uncertainty of the first harmonic wave load varies significantly along the ship bow area. It is shown that the largest local uncertainties of the first harmonic wave load relate to the differences in the local details of the propagating and deforming encountered waves along the hull. This paper also discusses the challenges that were encountered in the quantification of the uncertainties for this complex flow case. 相似文献