A State-of-the-art Integrated Transportation Simulation Platform

Nowadays, universities and companies have a huge need for simulation and modelling methodologies. In the particular case of traffic and transportation, making physical modifications to the real traffic networks could be highly expensive, dependent on political decisions and could be highly disruptive to the environment. However, while studying a specific domain or problem, analysing a problem through simulation may not be trivial and may need several simulation tools, hence raising interoperability issues. To overcome these problems, we propose an agent-directed transportation simulation platform, through the cloud, by means of services. We intend to use the IEEE standard HLA (High Level Architecture) for simulators interoperability and agents for controlling and coordination. Our motivations are to allow multiresolution analysis of complex domains, to allow experts to collaborate on the analysis of a common problem and to allow co-simulation and synergy of different application domains. This paper will start by presenting some preliminary background concepts to help better understand the scope of this work. After that, the results of a literature review is shown. Finally, the general architecture of a transportation simulation platform is proposed

Densifying the sparse cloud SimSaaS: The need of a synergy among agent-directed simulation, SimSaaS and HLA

Modelling & Simulation (M&S) is broadly used in real scenarios where making physical modifications could be highly expensive. With the so-called Simulation Software-as-a-Service (SimSaaS), researchers could take advantage of the huge amount of resource that cloud computing provides. Even so, studying and analysing a problem through simulation may need several simulation tools, hence raising interoperability issues. Having this in mind, IEEE developed a standard for interoperability among simulators named High Level Architecture (HLA). Moreover, the multi-agent system approach has become recognised as a convenient approach for modelling and simulating complex systems. Despite all the recent works and acceptance of these technologies, there is still a great lack of work regarding synergies among them. This paper shows by means of a literature review this lack of work or, in other words, the sparse Cloud SimSaaS. The literature review and the resulting taxonomy are the main contributions of this paper, as they provide a research agenda illustrating future research opportunities and trends

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In Cooperative Intelligent Transport Systems, road users and traffic managers share information for coordinating their actions to improve traffic efficiency allowing the driver to adapt to the traffic situation. Its effectiveness, however, depends on the user’s decision-making process, which is the main source of uncertainty in any mobility system and depends on the ability of the infrastructure to communicate timely and reliably. To cope with such a complex scenario, this paper proposes a game theory perspective based on the n-Person Prisoner’s Dilemma as a metaphor to represent the uncertainty of cooperation underlined by communication infrastructures in traveller information systems. Results highlighted a close relationship between the emergence of cooperation and network performance, as well as the impact of the communication failure on the loss of cooperation sustainment, which was not recovered after the system was re-established.This work is a result of project DynamiCITY: Fostering Dynamic Adaptation of Smart Cities to Cope with Crises and Disruptions [reference NORTE-01-0145- FEDER-000073] supported by Norte Portugal Regional Operational Programme (NORTE 2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF). This work was also supported by national funds of FCT/MCTES (Portuguese Foundation for Science and Technology), within the CISTER Research Unit (UIDP/UIDB/04234/2020).info:eu-repo/semantics/publishedVersio

On the potential of regenerative braking of electric buses as a function of their itinerary

This paper proposes a mathematical model for an electric bus powertrain, implemented in a simulation platform. We intend to analyze the consumption of energy according to the route specifications and other performance measures. The potential for regenerative braking will be evaluated for different routes, since it depends significantly on them. It is expected that a "pattern" can be observed in that concerning the potential of the system to recover back some of the energy spent in its operation. Moreover, the use of supercapacitors to make this braking energy absorption is investigated.This work is financed by FEDER Funds, through the Operational Programme for Competitiveness Factors COMPETE, and by Portuguese Funds through FCT - Foundation for Science and Technology, under the project 13844. The first author would like to thank FCT (Fundacao para a Cincia e Tecnologia) for the PhD scholarship SFRH/BD/51256/2010, and to the MIT- Portugal Program in Engineering Design and Advanced Manufacturing Leaders for Technical Industries focus area

Towards a microscopic traffic simulation framework to assess vehicle-to-vehicle networks

This paper presents the specification of a framework based on the concept of service-oriented architectures (SOA) to support the assessment of vehicular ad-hoc networks (VANET). A preliminary study of concepts related to SOA was carried out, as well as of those technologies that allow real-time data acquisition and dissemination within urban environments, and simulation tools to aid the simulation of the VANET. The requirements for our simulation framework were identified and a two-layered architecture was specified, which rely on the abstraction levels of services for vehicle-to-vehicle (V2V) communication. A prototypical application was implemented, which was used to demonstrate the feasibility of the approach presented through experimental results