We propose pro-social control strategies for connected automated vehicles(CAVs)to mitigate jamming waves in mixed-autonomy multi-lane traffic,resulting from car-following dynamics of human-driven vehicles(HDVs).Differ...We propose pro-social control strategies for connected automated vehicles(CAVs)to mitigate jamming waves in mixed-autonomy multi-lane traffic,resulting from car-following dynamics of human-driven vehicles(HDVs).Different from existing studies,which focus mostly on ego vehicle objectives to control CAVs in an individualistic manner,we devise a pro-social control algorithm.The latter takes into account the objectives(i.e.,driving comfort and traffic efficiency)of both the ego vehicle and surrounding HDVs to improve smoothness of the entire observable traffic.Under a model predictive control(MPC)framework that uses acceleration and lane change sequences of CAVs as optimization variables,the problem of individualistic,altruistic,and pro-social control is formulated as a non-convex mixed-integer nonlinear program(MINLP)and relaxed to a convex quadratic program through converting the piece-wise-linear constraints due to the optimal velocity with relative velocity(OVRV)car-following model into linear constraints by introducing slack variables.Low-fidelity simulations using the OVRV model and high-fidelity simulations using PTV VISSIM simulator show that pro-social and altruistic control can provide significant performance gains over individualistic driving in terms of efficiency and comfort on both single-and multi-lane roads.展开更多
This study analyzes the ways in which social enterprises contribute to society’s goals.In the new era of human development,many social problems cannot be resolved without the participation of social enterprises(SEs)....This study analyzes the ways in which social enterprises contribute to society’s goals.In the new era of human development,many social problems cannot be resolved without the participation of social enterprises(SEs).The study on these enterprises is of great significance for theoretical research and practical observation.In a modern market economy,SEs have pro-social market vitality and compatibility with the market economy;their action gives a glimpse into the truth of human development.As can be seen from the socio-economic reality,numerous entrepreneurs nurture a desire to run SEs at a certain stage of their career development.The tendency of some entrepreneurs to run SEs is of great significance for this study.Social enterprises are hybrid enterprises as opposed to for-profit enterprises and SEs must address complex problems through organizational and institutional innovations.State owned enterprises(SOEs)and SEs share many topics of research and have much to learn from each other,and a key question for SOE reform is what makes SOEs efficient quasi-social enterprises.Both SOEs and SEs assume a social mandate,and their fulfillment of social responsibilities is underpinned by their economic efficiency(market competitiveness).The theoretical rationale and institutional mechanism of SEs-not least their innovation practice and formation of rules-stem from the relationship and coordination between economic and social exchanges under market-based conditions.Social enterprises focus on altruistic social exchange but need to be supported by a certain economic exchange to finance their operations.The biggest social problem for China is its failure to balance economic and social exchanges,as well as the method of reward.Research on SEs should promote the understanding of these questions and the quest for their solutions.Social enterprises may inspire more enterprises to pursue pro-social innovation and development.展开更多
基金supported and funded by the Transport Area of Advance.The project IRIS is acknowledged for financial support.
文摘We propose pro-social control strategies for connected automated vehicles(CAVs)to mitigate jamming waves in mixed-autonomy multi-lane traffic,resulting from car-following dynamics of human-driven vehicles(HDVs).Different from existing studies,which focus mostly on ego vehicle objectives to control CAVs in an individualistic manner,we devise a pro-social control algorithm.The latter takes into account the objectives(i.e.,driving comfort and traffic efficiency)of both the ego vehicle and surrounding HDVs to improve smoothness of the entire observable traffic.Under a model predictive control(MPC)framework that uses acceleration and lane change sequences of CAVs as optimization variables,the problem of individualistic,altruistic,and pro-social control is formulated as a non-convex mixed-integer nonlinear program(MINLP)and relaxed to a convex quadratic program through converting the piece-wise-linear constraints due to the optimal velocity with relative velocity(OVRV)car-following model into linear constraints by introducing slack variables.Low-fidelity simulations using the OVRV model and high-fidelity simulations using PTV VISSIM simulator show that pro-social and altruistic control can provide significant performance gains over individualistic driving in terms of efficiency and comfort on both single-and multi-lane roads.
文摘This study analyzes the ways in which social enterprises contribute to society’s goals.In the new era of human development,many social problems cannot be resolved without the participation of social enterprises(SEs).The study on these enterprises is of great significance for theoretical research and practical observation.In a modern market economy,SEs have pro-social market vitality and compatibility with the market economy;their action gives a glimpse into the truth of human development.As can be seen from the socio-economic reality,numerous entrepreneurs nurture a desire to run SEs at a certain stage of their career development.The tendency of some entrepreneurs to run SEs is of great significance for this study.Social enterprises are hybrid enterprises as opposed to for-profit enterprises and SEs must address complex problems through organizational and institutional innovations.State owned enterprises(SOEs)and SEs share many topics of research and have much to learn from each other,and a key question for SOE reform is what makes SOEs efficient quasi-social enterprises.Both SOEs and SEs assume a social mandate,and their fulfillment of social responsibilities is underpinned by their economic efficiency(market competitiveness).The theoretical rationale and institutional mechanism of SEs-not least their innovation practice and formation of rules-stem from the relationship and coordination between economic and social exchanges under market-based conditions.Social enterprises focus on altruistic social exchange but need to be supported by a certain economic exchange to finance their operations.The biggest social problem for China is its failure to balance economic and social exchanges,as well as the method of reward.Research on SEs should promote the understanding of these questions and the quest for their solutions.Social enterprises may inspire more enterprises to pursue pro-social innovation and development.