Traffic safety is one of the problems that need to be addressed in the construction and development of expressway.The key content of the design of traffic safety facilities is optimizing traffic safety facilities to r...Traffic safety is one of the problems that need to be addressed in the construction and development of expressway.The key content of the design of traffic safety facilities is optimizing traffic safety facilities to reduce the probability of traffic safety accidents.Based on the analysis of highway safety facilities design optimization requirements,this paper puts forward the corresponding optimization measures,and explores the innovation of safety facilities design,in hopes of providing reference for the design of highway safety facilities.展开更多
Addressing the key challenges of ambiguous spatial boundaries of 15-minute community life circles and inadequate coordination between facility supply and demand,this study critically revisits classical theoretical app...Addressing the key challenges of ambiguous spatial boundaries of 15-minute community life circles and inadequate coordination between facility supply and demand,this study critically revisits classical theoretical approaches and proposes a spatial governance model for community life circles,along with a three-dimensional integrated framework for facility optimization.Based on this,the study develops a comprehensive technical approach for spatial delineation and facility optimization,comprising four key steps:(1)identifying existing facility service areas,(2)delineating future community life circles,(3)conducting cluster analysis of supply-demand balance,and(4)formulating optimization strategies.It incorporates practical factors such as population distribution and land supply potential,while remaining closely aligned with subdistrict and community administrative boundaries,to provide methodological insights and complementary perspectives for optimizing community life circle governance in China.Taking the central urban area of Laiyang,Shandong Province,as a case study,the empirical analysis validates the spatial governance model by revealing the polycentric distribution of existing facilities and their overlapping service areas.The findings highlight a dual deficiency of public facilities in both the peripheral areas of the old town and newly developed areas,which is a critical barrier to establishing 15-minute community life circles in Laiyang.Finally,the study proposes classification-based governance optimization strategies for community life circle planning in Laiyang,while also providing a practical governance model applicable to other small-and medium-sized cities.展开更多
Integration of electric vehicles(EVs),demand response and renewable energy will bring multiple opportunities for low carbon power system.A promising integration will be EV battery swapping station(BSS)bundled with PV(...Integration of electric vehicles(EVs),demand response and renewable energy will bring multiple opportunities for low carbon power system.A promising integration will be EV battery swapping station(BSS)bundled with PV(photovoltaic)power.Optimizing the configuration and operation of BSS is the key problem to maximize benefit of this integration.The main objective of this paper is to solve infrastructure configuration of BSS.The principle challenge of such an objective is to enhance the swapping ability and save corresponding investment and operation cost under uncertainties of PV generation and swapping demand.Consequently this paper mainly concentrates on combining operation optimization with optimal investment strategies for BSS considering multiscenarios PV power generation and swapping demand.A stochastic programming model is developed by using state flow method to express different states of batteries and its objective is to maximize the station’s net profit.The model is formulated as a mixed-integer linear program to guarantee the efficiency and stability of the optimization.Case studies validate the effectiveness of the proposed approach and demonstrate that ignoring the uncertainties of PV generation and swapping demand may lead to an inappropriate batteries,chargers and swapping robots configuration for BSS.展开更多
文摘Traffic safety is one of the problems that need to be addressed in the construction and development of expressway.The key content of the design of traffic safety facilities is optimizing traffic safety facilities to reduce the probability of traffic safety accidents.Based on the analysis of highway safety facilities design optimization requirements,this paper puts forward the corresponding optimization measures,and explores the innovation of safety facilities design,in hopes of providing reference for the design of highway safety facilities.
文摘Addressing the key challenges of ambiguous spatial boundaries of 15-minute community life circles and inadequate coordination between facility supply and demand,this study critically revisits classical theoretical approaches and proposes a spatial governance model for community life circles,along with a three-dimensional integrated framework for facility optimization.Based on this,the study develops a comprehensive technical approach for spatial delineation and facility optimization,comprising four key steps:(1)identifying existing facility service areas,(2)delineating future community life circles,(3)conducting cluster analysis of supply-demand balance,and(4)formulating optimization strategies.It incorporates practical factors such as population distribution and land supply potential,while remaining closely aligned with subdistrict and community administrative boundaries,to provide methodological insights and complementary perspectives for optimizing community life circle governance in China.Taking the central urban area of Laiyang,Shandong Province,as a case study,the empirical analysis validates the spatial governance model by revealing the polycentric distribution of existing facilities and their overlapping service areas.The findings highlight a dual deficiency of public facilities in both the peripheral areas of the old town and newly developed areas,which is a critical barrier to establishing 15-minute community life circles in Laiyang.Finally,the study proposes classification-based governance optimization strategies for community life circle planning in Laiyang,while also providing a practical governance model applicable to other small-and medium-sized cities.
基金the National Natural Science Foundation of China(Grant No.51207050).
文摘Integration of electric vehicles(EVs),demand response and renewable energy will bring multiple opportunities for low carbon power system.A promising integration will be EV battery swapping station(BSS)bundled with PV(photovoltaic)power.Optimizing the configuration and operation of BSS is the key problem to maximize benefit of this integration.The main objective of this paper is to solve infrastructure configuration of BSS.The principle challenge of such an objective is to enhance the swapping ability and save corresponding investment and operation cost under uncertainties of PV generation and swapping demand.Consequently this paper mainly concentrates on combining operation optimization with optimal investment strategies for BSS considering multiscenarios PV power generation and swapping demand.A stochastic programming model is developed by using state flow method to express different states of batteries and its objective is to maximize the station’s net profit.The model is formulated as a mixed-integer linear program to guarantee the efficiency and stability of the optimization.Case studies validate the effectiveness of the proposed approach and demonstrate that ignoring the uncertainties of PV generation and swapping demand may lead to an inappropriate batteries,chargers and swapping robots configuration for BSS.
