排序方式: 共有21条查询结果,搜索用时 15 毫秒
1.
Ton Danique Zomer Lara-Britt Schneider Florian Hoogendoorn-Lanser Sascha Duives Dorine Cats Oded Hoogendoorn Serge 《Transportation》2020,47(4):1843-1866
Transportation - Active modes (i.e. walking and cycling) have received significant attention by governments worldwide, due to the benefits related to the use of these modes. Consequently,... 相似文献
2.
de Haas Mathijs Kroesen Maarten Chorus Caspar Hoogendoorn-Lanser Sascha Hoogendoorn Serge 《Transportation》2022,49(3):815-840
Transportation - In recent years, the e-bike has become increasingly popular in many European countries. With higher speeds and less effort needed, the e-bike is a promising mode of transport to... 相似文献
3.
A numerical study of ship-to-ship interaction forces is performed using a commercial CFD code, and the results are compared with experimental data and with the results of a panel method analysis. Two ship models have been used in the interaction forces analysis: a tug and a tanker, advancing parallel to each other with different lateral distances and two different values of the fluid depth. Computations are carried out with four different flow models: inviscid and viscous flow with the free surface modeled as a rigid wall and inviscid and viscous flow with the deformable free surface. A fair agreement was obtained with available experimental data and results obtained by panel method. The influence of viscosity in the computations is found to be comparatively weak, while the wavemaking effects may be important, at small magnitude of the horizontal clearance. 相似文献
4.
采用势流理论计算限制水域船舶水动力相互作用力(英文) 总被引:1,自引:0,他引:1
5.
The vision of intelligent vehicles traveling in road networks has prompted numerous concepts to control future traffic flow, one of which is the in-vehicle actuation of traffic control commands. The key of this concept is using intelligent vehicles as actuators for traffic control systems. Under this concept, we design and test a control system that connects a traffic controller with in-vehicle controllers via vehicle-to-infrastructure communication. The link-level traffic controller regulates traffic speeds through variable speed limits (VSL) gantries to resolve stop-and-go waves, while intelligent vehicles control accelerations through vehicle propulsion and brake systems to optimize their local situations. It is assumed that each intelligent vehicle receives VSL commands from the traffic controller and uses them as variable parameters for the local vehicle controller. Feasibility and effectiveness of the connected control paradigm are tested with simulation on a two-lane freeway stretch with intelligent vehicles randomly distributed among human-driven vehicles. Simulation shows that the connected VSL and vehicle control system improves traffic efficiency and sustainability; that is, total time spent in the network and average fuel consumption rate are reduced compared to (uncontrolled and controlled) scenarios with 100% human drivers and to uncontrolled scenarios with the same intelligent vehicle penetration rates. 相似文献
6.
AbstractDespite the wide use of utility theory to model travellers' behaviour, the interest in non-expected utility theories has increased due to their potential to capture more realistic behaviour. A main question raised is whether travellers are better described as utility maximizers or should be qualified differently.This paper presents a literature review on the use of expected utility theory (EUT), prospect theory (PT) and regret theory (RT) to model travellers' behaviour. Gaps in the literature are identified and a discussion about advantages and disadvantages of each theory is presented. A case study illustrates the differences between the theories.Under certain conditions, PT and RT restrict themselves to EUT. Their added value, however, is the possibility of capturing loss aversion, risk aversion and risk-seeking (PT) and regret aversion (RT). On the practical level, the use of EUT is well established, while contributions of PT and RT are marginal. On the theoretical level, however, RT seems to be (marginally) more suitable to model travellers' behaviour, while EUT and PT are equally suitable. This suggests that the large use of EUT is highly influenced by its very tractable framework. We do not claim the superiority of any theory, but propose to compare them through a systematic review. 相似文献
7.
Variations of the abundance and nucleic acid content of heterotrophic bacteria in Beaufort Shelf waters during winter and spring 总被引:1,自引:0,他引:1
Claude Belzile Sonia Brugel Christian Nozais Yves Gratton Serge Demers 《Journal of Marine Systems》2008,74(3-4):946
Depth profiles of heterotrophic bacteria abundance were measured weekly over a 6-month period from December to May in Franklin Bay, a 230 m-deep coastal Arctic Ocean site of the southeastern Beaufort Sea. Total bacteria, low nucleic acid (LNA) and high nucleic acid (HNA) bacteria abundances were measured using flow cytometry after SYBR Green I staining. The HNA bacteria abundance in surface waters started to increase 5–6 weeks after phytoplankton growth resumed in spring, increasing from 1 × 105 to 3 × 105 cells mL− 1 over an 8-week period, with a net growth rate of 0.018 d− 1. LNA bacteria response was delayed by more than two months relative to the beginning of the phytoplankton biomass accumulation and had a lower net growth rate of 0.013 d− 1. The marked increase in bacterial abundance occurred before any significant increase in organic matter input from river discharge (as indicated by the unchanged surface water salinity and DOC concentrations), and in the absence of water temperature increase. The abundance of bacteria below the halocline was relatively high until January (up to 5 × 105 cells mL− 1) but then decreased to values close to 2 × 105 cells mL− 1. The three-fold bacterial abundance increase observed in surface waters in spring was mostly due to HNA bacteria, supporting the idea that these cells are the most active. 相似文献
8.
Reggiani Giulia van Oijen Tim Hamedmoghadam Homayoun Daamen Winnie Vu Hai L. Hoogendoorn Serge 《Transportation》2022,49(3):897-925
Transportation - A fully separated bicycle network from vehicular traffic is not realistic even for the most bicycle-friendly cities. Thus, all around the world urban cycling entails switching... 相似文献
9.
Geertje Hegeman Andreas Tapani Serge Hoogendoorn 《Transportation Research Part C: Emerging Technologies》2009,17(6):617-630
This contribution presents the results of a microscopic traffic simulation study of the potential effects of an overtaking assistant for two-lane rural roads. The overtaking assistant is developed to support drivers in judging whether or not an overtaking opportunity can be accepted based on the distance to the next oncoming vehicle. Drivers have been found to consider this to be a difficult part of an overtaking manoeuvre. The assistant’s effects on traffic efficiency, driver comfort and road safety have been investigated using traffic simulation. The results indicate that this type of overtaking assistant can provide safety benefits in terms of increased average time-to-collision to the next oncoming vehicle during overtaking manoeuvres. This safety benefit can be achieved without negative consequences for traffic efficiency and driver comfort. A driver assistance system that supports the distance judging part of overtaking manoeuvres can therefore contribute to improved traffic conditions on the two-lane rural roads of the future. 相似文献
10.
A review on travel behaviour modelling in dynamic traffic simulation models for evacuations 总被引:1,自引:0,他引:1
Dynamic traffic simulation models are frequently used to support decisions when planning an evacuation. This contribution
reviews the different (mathematical) model formulations underlying these traffic simulation models used in evacuation studies
and the behavioural assumptions that are made. The appropriateness of these behavioural assumptions is elaborated on in light
of the current consensus on evacuation travel behaviour, based on the view from the social sciences as well as empirical studies
on evacuation behaviour. The focus lies on how travellers’ decisions are predicted through simulation regarding the choice
to evacuate, departure time choice, destination choice, and route choice. For the evacuation participation and departure time
choice we argue in favour of the simultaneous approach to dynamic evacuation demand prediction using the repeated binary logit
model. For the destination choice we show how further research is needed to generalize the current preliminary findings on
the location-type specific destination choice models. For the evacuation route choice we argue in favour of hybrid route choice
models that enable both following instructed routes and en-route switches. Within each of these discussions, we point at current
limitations and make corresponding suggestions on promising future research directions. 相似文献