The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Cristian Borcea - One of the best experts on this subject based on the ideXlab platform.
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divert a distributed Vehicular Traffic re routing system for congestion avoidance
IEEE Transactions on Mobile Computing, 2017Co-Authors: Iulian Sandu Popa, Cristian BorceaAbstract:Centralized solutions for Vehicular Traffic re-routing to alleviate congestion suffer from two intrinsic problems: scalability, as the central server has to perform intensive computation and communication with the vehicles in real-time; and privacy, as the drivers have to share their location as well as the origins and destinations of their trips with the server. This article proposes DIVERT, a distributed Vehicular re-routing system for congestion avoidance. DIVERT offloads a large part of the re-routing computation at the vehicles, and thus, the re-routing process becomes practical in real-time. To take collaborative re-routing decisions, the vehicles exchange messages over Vehicular ad hoc networks. DIVERT is a hybrid system because it still uses a server and Internet communication to determine an accurate global view of the Traffic. In addition, DIVERT balances the user privacy with the re-routing effectiveness. The simulation results demonstrate that, compared with a centralized system, the proposed hybrid system increases the user privacy by 92 percent on average. In terms of average travel time, DIVERT's performance is slightly less than that of the centralized system, but it still achieves substantial gains compared to the no re-routing case. In addition, DIVERT reduces the CPU and network load on the server by 99.99 and 95 percent, respectively.
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proactive Vehicular Traffic rerouting for lower travel time
IEEE Transactions on Vehicular Technology, 2013Co-Authors: Juan Pan, Iulian Sandu Popa, Karine Zeitouni, Cristian BorceaAbstract:Traffic congestion causes driver frustration and costs billions of dollars annually in lost time and fuel consumption. This paper presents five Traffic rerouting strategies designed to be incorporated in a cost-effective and easily deployable Vehicular Traffic guidance system that reduces travel time. The proposed strategies proactively compute individually tailored rerouting guidance to be pushed to vehicles when signs of congestion are observed on their route. The five proposed strategies are the dynamic shortest path (DSP), the A* shortest path with repulsion (AR*), the random k shortest path (RkSP), the entropy-balanced kSP (EBkSP), and the flow-balanced kSP (FBkSP). Extensive simulation results show that the proposed strategies are capable of reducing the travel time as much as a state-of-the-art dynamic Traffic assignment (DTA) algorithm while avoiding the issues that make DTA impractical, such as the lack of scalability and robustness, and high computation time. Furthermore, the variety of proposed strategies allows tuning the system to different levels of tradeoffs between rerouting effectiveness and computational efficiency. In addition, the proposed Traffic guidance system can significantly improve the Traffic even if many drivers ignore the guidance or if the system adoption rate is relatively low.
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VANET routing on city roads using real-time Vehicular Traffic information
IEEE Transactions on Vehicular Technology, 2009Co-Authors: Josiane Nzouonta, Neeraj Rajgure, Guiling Wang, Cristian BorceaAbstract:This paper presents a class of routing protocols called road-based using Vehicular Traffic (RBVT) routing, which outperforms existing routing protocols in city-based Vehicular ad hoc networks (VANETs). RBVT protocols leverage real-time Vehicular Traffic information to create road-based paths consisting of successions of road intersections that have, with high probability, network connectivity among them. Geographical forwarding is used to transfer packets between intersections on the path, reducing the path's sensitivity to individual node movements. For dense networks with high contention, we optimize the forwarding using a distributed receiver-based election of next hops based on a multicriterion prioritization function that takes nonuniform radio propagation into account. We designed and implemented a reactive protocol RBVT-R and a proactive protocol RBVT-P and compared them with protocols representative of mobile ad hoc networks and VANETs. Simulation results in urban settings show that RBVT-R performs best in terms of average delivery rate, with up to a 40% increase compared with some existing protocols. In terms of average delay, RBVT-P performs best, with as much as an 85% decrease compared with the other protocols.
Luisa Fermo - One of the best experts on this subject based on the ideXlab platform.
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Vehicular Traffic crowds and swarms from kinetic theory and multiscale methods to applications and research perspectives
Mathematical Models and Methods in Applied Sciences, 2019Co-Authors: Giacomo Albi, Nicola Bellomo, Luisa Fermo, Jeongho Kim, Lorenzo Pareschi, David Poyato, Juan SolerAbstract:This paper presents a review and critical analysis on the modeling of the dynamics of Vehicular Traffic, human crowds and swarms seen as living and, hence, complex systems. It contains a survey of ...
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a fully discrete state kinetic theory approach to modeling Vehicular Traffic
Siam Journal on Applied Mathematics, 2013Co-Authors: Luisa Fermo, Andrea TosinAbstract:This paper presents a new mathematical model of Vehicular Traffic, based on the methods of the generalized kinetic theory, in which the space of microscopic states (position and speed) of the vehicles is genuinely discrete. While in the recent literature discrete-velocity kinetic models of car Traffic have already been successfully proposed, this is, to our knowledge, the first attempt to account for all aspects of the physical granularity of car flow within the formalism of the aforesaid mathematical theory. Thanks to a rich but handy structure, the resulting model allows one to easily implement and simulate various realistic scenarios giving rise to characteristic Traffic phenomena of practical interest (e.g., queue formation due to roadwork or to a Traffic light). Moreover, it is analytically tractable under quite general assumptions, whereby fundamental properties of the solutions can be rigorously proved.
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a fully discrete state kinetic theory approach to modeling Vehicular Traffic
arXiv: Mathematical Physics, 2012Co-Authors: Luisa Fermo, Andrea TosinAbstract:This paper presents a new mathematical model of Vehicular Traffic, based on the methods of the generalized kinetic theory, in which the space of microscopic states (position and velocity) of the vehicles is genuinely discrete. While in the recent literature discrete-velocity kinetic models of car Traffic have already been successfully proposed, this is, to our knowledge, the first attempt to account for all aspects of the physical granularity of car flow within the formalism of the aforesaid mathematical theory. Thanks to a rich but handy structure, the resulting model allows one to easily implement and simulate various realistic scenarios giving rise to characteristic Traffic phenomena of practical interest (e.g., queue formation due to roadworks or to a Traffic light). Moreover, it is analytically tractable under quite general assumptions, whereby fundamental properties of the solutions can be rigorously proved.
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towards the modeling of Vehicular Traffic as a complex system a kinetic theory approach
Mathematical Models and Methods in Applied Sciences, 2012Co-Authors: Abdelghani Bellouquid, E De Angelis, Luisa FermoAbstract:Kinetic theory methods are applied in this paper to model the dynamics of Vehicular Traffic. The basic idea is to consider each Vehicular-driver system as a single part, or micro-system, of a large complex system, in order to capture the heterogeneous behavior of all the micro-systems that compose the overall system. The evolution of the system is ruled by nonlinearly additive interactions described by stochastic games. A qualitative analysis for the proposed model with discrete states is developed, showing well-posedness of the related Cauchy problem for the spatially homogeneous case and for the spatially nonhomogeneous case, the latter with periodic boundary conditions. Numerical simulations are also performed, with the aim to show how the model proposed is able to reproduce empirical data and to show emerging behavior as the formation of clusters.
Alexeia Barufatti Grisolia - One of the best experts on this subject based on the ideXlab platform.
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evaluation the urban atmospheric conditions in different cities using comet and micronuclei assay in tradescantia pallida
Chemosphere, 2017Co-Authors: Juliana Caroline Vivian Sposito, Bruno Do Amaral Crispim, Rosilda Mara Mussury, Leonardo De Oliveira Seno, Amanda Izadora Roman, Joelson Goncalves Pereira, Alexeia Barufatti GrisoliaAbstract:In the present study, genotoxicity and mutagenicity were investigated in Tradescantia pallida exposed to Vehicular Traffic at different sites in a high-altitude tropical climate. During March, May, July, September, and November 2014, a comet assay and micronucleus bioassays were conducted on young inflorescences and leaves of T. pallida collected from twelve towns in the southern region of Mato Grosso do Sul with different amounts of Vehicular Traffic. Weather parameters (temperature, relative humidity and rainfall) were measured and vehicles were counted to determine Traffic levels in each town. A higher frequency of genotoxic and mutagenic damage was observed in the municipality of Dourados. The highest frequency of genetic damage was observed in September and November according to both assays. Relative humidity and rainfall were inversely proportional to the frequency of genetic damage in T. pallida during the collection period. Based on these results, we conclude that the bioassays are efficient for assessing the effects of Vehicular Traffic in these towns with respect to weather conditions over time. These bioassays can be applied to identify risk areas, which are determined by climatic conditions and air pollutants released.
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effects of atmospheric pollutants on somatic and germ cells of tradescantia pallida rose d r hunt cv purpurea
Anais Da Academia Brasileira De Ciencias, 2014Co-Authors: Bruno Do Amaral Crispim, Juliana Caroline Vivian Sposito, Rosilda Mara Mussury, Leonardo De Oliveira Seno, Alexeia Barufatti GrisoliaAbstract:Anatomical alterations in leaves and DNA damage in cells caused by the accumulation of atmospheric pollutants can be measured by epidermal leaf analyses and Tradescantia micronuclei assay with early pollen tetrad cells. The present study examined the feasibility of using somatic and germ cells of Tradescantia pallida for biomonitoring purposes in the city of Dourados, state of Mato Grosso do Sul (MS), Brazil. Stomatal, micronucleus and epidermal leaf analyses were performed, using standard methodologies, on plants growing at three locations during six different time periods. Tradescantia micronuclei data were analyzed using SAS 9.2 software package and stomatal data were analyzed using SANEST software. Analyses of stomatal characteristics and micronuclei examination in T. pallida were found to be an efficient tool for monitoring atmospheric pollution. The micronucleus assay suggested that the number of micronuclei in early pollen tetrad cells was related to the intensity of Vehicular Traffic. Increased number of epidermal cells and stomata and increased stomatal density observed at locations with greater Vehicular Traffic are likely physiological responses of those plants to the increased gas exchange in highly polluted environments.
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biomonitoring the genotoxic effects of pollutants on tradescantia pallida rose d r hunt in dourados brazil
Environmental Science and Pollution Research, 2012Co-Authors: Bruno Do Amaral Crispim, Rosilda Mara Mussury, Alexeia Barufatti Grisolia, Jussara Oliveira Vaini, Tatiane Zaratini Teixeira, Leonardo De Oliveira SenoAbstract:Purpose This study aimed to associate the intensity of Vehicular Traffic in the city of Dourados (Mato Grosso do Sul State, Brazil) with mutagenic effects and alterations in leaf physiology as measured by the quantity of micronuclei and the leaf surface parameters of Tradescantia pallida.
Leonardo De Oliveira Seno - One of the best experts on this subject based on the ideXlab platform.
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evaluation the urban atmospheric conditions in different cities using comet and micronuclei assay in tradescantia pallida
Chemosphere, 2017Co-Authors: Juliana Caroline Vivian Sposito, Bruno Do Amaral Crispim, Rosilda Mara Mussury, Leonardo De Oliveira Seno, Amanda Izadora Roman, Joelson Goncalves Pereira, Alexeia Barufatti GrisoliaAbstract:In the present study, genotoxicity and mutagenicity were investigated in Tradescantia pallida exposed to Vehicular Traffic at different sites in a high-altitude tropical climate. During March, May, July, September, and November 2014, a comet assay and micronucleus bioassays were conducted on young inflorescences and leaves of T. pallida collected from twelve towns in the southern region of Mato Grosso do Sul with different amounts of Vehicular Traffic. Weather parameters (temperature, relative humidity and rainfall) were measured and vehicles were counted to determine Traffic levels in each town. A higher frequency of genotoxic and mutagenic damage was observed in the municipality of Dourados. The highest frequency of genetic damage was observed in September and November according to both assays. Relative humidity and rainfall were inversely proportional to the frequency of genetic damage in T. pallida during the collection period. Based on these results, we conclude that the bioassays are efficient for assessing the effects of Vehicular Traffic in these towns with respect to weather conditions over time. These bioassays can be applied to identify risk areas, which are determined by climatic conditions and air pollutants released.
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effects of atmospheric pollutants on somatic and germ cells of tradescantia pallida rose d r hunt cv purpurea
Anais Da Academia Brasileira De Ciencias, 2014Co-Authors: Bruno Do Amaral Crispim, Juliana Caroline Vivian Sposito, Rosilda Mara Mussury, Leonardo De Oliveira Seno, Alexeia Barufatti GrisoliaAbstract:Anatomical alterations in leaves and DNA damage in cells caused by the accumulation of atmospheric pollutants can be measured by epidermal leaf analyses and Tradescantia micronuclei assay with early pollen tetrad cells. The present study examined the feasibility of using somatic and germ cells of Tradescantia pallida for biomonitoring purposes in the city of Dourados, state of Mato Grosso do Sul (MS), Brazil. Stomatal, micronucleus and epidermal leaf analyses were performed, using standard methodologies, on plants growing at three locations during six different time periods. Tradescantia micronuclei data were analyzed using SAS 9.2 software package and stomatal data were analyzed using SANEST software. Analyses of stomatal characteristics and micronuclei examination in T. pallida were found to be an efficient tool for monitoring atmospheric pollution. The micronucleus assay suggested that the number of micronuclei in early pollen tetrad cells was related to the intensity of Vehicular Traffic. Increased number of epidermal cells and stomata and increased stomatal density observed at locations with greater Vehicular Traffic are likely physiological responses of those plants to the increased gas exchange in highly polluted environments.
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biomonitoring the genotoxic effects of pollutants on tradescantia pallida rose d r hunt in dourados brazil
Environmental Science and Pollution Research, 2012Co-Authors: Bruno Do Amaral Crispim, Rosilda Mara Mussury, Alexeia Barufatti Grisolia, Jussara Oliveira Vaini, Tatiane Zaratini Teixeira, Leonardo De Oliveira SenoAbstract:Purpose This study aimed to associate the intensity of Vehicular Traffic in the city of Dourados (Mato Grosso do Sul State, Brazil) with mutagenic effects and alterations in leaf physiology as measured by the quantity of micronuclei and the leaf surface parameters of Tradescantia pallida.
Andrea Tosin - One of the best experts on this subject based on the ideXlab platform.
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a fully discrete state kinetic theory approach to modeling Vehicular Traffic
Siam Journal on Applied Mathematics, 2013Co-Authors: Luisa Fermo, Andrea TosinAbstract:This paper presents a new mathematical model of Vehicular Traffic, based on the methods of the generalized kinetic theory, in which the space of microscopic states (position and speed) of the vehicles is genuinely discrete. While in the recent literature discrete-velocity kinetic models of car Traffic have already been successfully proposed, this is, to our knowledge, the first attempt to account for all aspects of the physical granularity of car flow within the formalism of the aforesaid mathematical theory. Thanks to a rich but handy structure, the resulting model allows one to easily implement and simulate various realistic scenarios giving rise to characteristic Traffic phenomena of practical interest (e.g., queue formation due to roadwork or to a Traffic light). Moreover, it is analytically tractable under quite general assumptions, whereby fundamental properties of the solutions can be rigorously proved.
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a fully discrete state kinetic theory approach to modeling Vehicular Traffic
arXiv: Mathematical Physics, 2012Co-Authors: Luisa Fermo, Andrea TosinAbstract:This paper presents a new mathematical model of Vehicular Traffic, based on the methods of the generalized kinetic theory, in which the space of microscopic states (position and velocity) of the vehicles is genuinely discrete. While in the recent literature discrete-velocity kinetic models of car Traffic have already been successfully proposed, this is, to our knowledge, the first attempt to account for all aspects of the physical granularity of car flow within the formalism of the aforesaid mathematical theory. Thanks to a rich but handy structure, the resulting model allows one to easily implement and simulate various realistic scenarios giving rise to characteristic Traffic phenomena of practical interest (e.g., queue formation due to roadworks or to a Traffic light). Moreover, it is analytically tractable under quite general assumptions, whereby fundamental properties of the solutions can be rigorously proved.
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mathematical modeling of Vehicular Traffic a discrete kinetic theory approach
Mathematical Models and Methods in Applied Sciences, 2007Co-Authors: Marcello Edoardo Delitala, Andrea TosinAbstract:Following some general ideas on the discrete kinetic and stochastic game theory proposed by one of the authors in a previous work, this paper develops a discrete velocity mathematical model for Vehicular Traffic along a one-way road. The kinetic scale is chosen because, unlike the macroscopic one, it allows to capture the probabilistic essence of the interactions among the vehicles, and offers at the same time, unlike the microscopic one, the opportunity of a profitable analytical investigation of the relevant global features of the system. The discretization of the velocity variable, rather than being a pure mathematical technicality, plays a role in including the intrinsic granular nature of the flow of vehicles in the mathematical theory of Traffic. Other important characteristics of the model concern the gain and loss terms of the kinetic equations, namely the construction of a density-dependent table of games to model velocity transitions and the introduction of a visibility length to account for non...
