Approach to Design Behavioural Models for Traffic Network Users - Choice of transport mode

Our research work concerns the development of a multimodal urban traffic simulator designed to be a tool of decision-making aid similar to a game where in the user-player can test different scenarios by immersion in a 3D virtual city. Our approach is based on the activity-based model and the multi-agent technology. The implemented result is a hybrid simulator connecting numerical simulation and behavioural aspects coming from real data. This paper is focused on two points: firstly, we introduce how a final user (the traffic regulator) instantiates and assembles components so as to model a city and its urban traffic network, secondly, we present the use of Dempster-Shafer theory in the context of discrete choice modelling. Our approach manipulates input variables in order to test realistic representations of behaviours of agent categories in a decision-making process. The traffic modelling is based on a questionnaire elaborated from standard arrays of Taguchi. The significant variables and interactions are determined with the analysis of variance which suggests a reduced model describing the behaviour of a particular social category. The belief theory is used to take into account the doubt of some respondents as well as for the preferences redistribution if the number of alternatives changes. The effects of external traffic conditions are also quantified to choose a'robust'alternative and to use the agents'memory

Aide à la décision pour la concept de systèmes complexes : une approche SMA

National audienceManagement of complex systems (such as hospitals, cities, transportation systems) is concerned with many problems, among which the impact evaluation of a decision is. To do so, we propose that the decision maker interacts with a model of the organization. This action is similar with a player's one and makes possible immersion of the decision maker in a virtual environment rather close to the real environment. Thus environment objects must be able to react as realistically as possible. Within an Urban Traffic Systems that leads to produce a modeling and simulation environment with "SimCity©"-like graphics but with some advanced functionalities added for the design of networks and the management of the traffic. The graphic aspect has a huge importance within this domain. We propose to solve this problem using an approach that combines the facility of object oriented modeling with the power of behaviors description of the multiagent approach. This methodological framework includes the use of formal specifications enabling a model checking before its implementation