As global air transportation as well as supply chains face unprecedented challenges,optimizing hub locations is crucial for enhancing efficiency,reducing costs,and mitigating environmental impacts.This paper reviews t...As global air transportation as well as supply chains face unprecedented challenges,optimizing hub locations is crucial for enhancing efficiency,reducing costs,and mitigating environmental impacts.This paper reviews the state-of-the-art in hub location problems,with a particular focus on air transportation,driven by the increasing complexity and importance of networks in today’s interconnected world.Our review offers two major contributions:a meta-review of existing surveys to synthesize current knowledge and identify gaps,and the proposal of ten critical research challenges encapsulated in the acronym DISRUPTIVE.These challenges include the need for high-quality datasets,deeper analytical insights,sustainability considerations,robustness against disruptions,addressing uncertainty,leveraging parallelization techniques,incorporating temporal dynamics,embracing interdisciplinary approaches,designing versatile hubs,and exploring emerging transportation modes.By addressing these challenges,researchers can drive innovation in hub location problems,paving the way for more resilient and efficient logistical networks that meet the demands of a rapidly evolving global landscape.展开更多
Urban air mobility(UAM)extends urban transportation to low-altitude airspace using electric vertical take-off and landing(eVTOL)vehicle to reduce traffic congestion.The vertical take-off and landing(VTOL)site connecti...Urban air mobility(UAM)extends urban transportation to low-altitude airspace using electric vertical take-off and landing(eVTOL)vehicle to reduce traffic congestion.The vertical take-off and landing(VTOL)site connecting ground and air transport is the critical infrastructure of the UAM.Determining its locations is essential for the design and operation of the air route.This study focuses on the problem of the location of the VTOL site,using Shenzhen as the study area,and establishes an integer programming model with the objective of maximizing travel cost savings to identify the optimal locations of the VTOL sites.This study is different from existing ones in that it explicitly considers the three-dimensional spatial availability of VTOL sites.Geographic information system(GIS)tools are used to identify locations that satisfy two-dimensional(2D)planar availability,and an obstacle assessment model of the approach/departure and transitional surfaces of the VTOL site is built to further screen the locations.The selected potential sites are used as input to the integer programming model,ensuring that the locations identified to establish the VTOL site are optimal.The impact of the number of VTOL sites,the user's transfer time at the VTOL sites,and the eVTOL pricing on the model solution is also discussed.Although this study uses Shenzhen as a research object,the proposed methodology is generalized and applicable to any other city or region,providing recommendations and references for initial planning and related operations of the UAM in selected areas.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.U2233214).
文摘As global air transportation as well as supply chains face unprecedented challenges,optimizing hub locations is crucial for enhancing efficiency,reducing costs,and mitigating environmental impacts.This paper reviews the state-of-the-art in hub location problems,with a particular focus on air transportation,driven by the increasing complexity and importance of networks in today’s interconnected world.Our review offers two major contributions:a meta-review of existing surveys to synthesize current knowledge and identify gaps,and the proposal of ten critical research challenges encapsulated in the acronym DISRUPTIVE.These challenges include the need for high-quality datasets,deeper analytical insights,sustainability considerations,robustness against disruptions,addressing uncertainty,leveraging parallelization techniques,incorporating temporal dynamics,embracing interdisciplinary approaches,designing versatile hubs,and exploring emerging transportation modes.By addressing these challenges,researchers can drive innovation in hub location problems,paving the way for more resilient and efficient logistical networks that meet the demands of a rapidly evolving global landscape.
基金National Natural Science Foundation of China(Grant Nos.U2033203 and 52272333)Fundamental Research Funds for Central Universities of Nanjing University of Aeronautics and Astronautics(Grant No.3082022NS2022067).
文摘Urban air mobility(UAM)extends urban transportation to low-altitude airspace using electric vertical take-off and landing(eVTOL)vehicle to reduce traffic congestion.The vertical take-off and landing(VTOL)site connecting ground and air transport is the critical infrastructure of the UAM.Determining its locations is essential for the design and operation of the air route.This study focuses on the problem of the location of the VTOL site,using Shenzhen as the study area,and establishes an integer programming model with the objective of maximizing travel cost savings to identify the optimal locations of the VTOL sites.This study is different from existing ones in that it explicitly considers the three-dimensional spatial availability of VTOL sites.Geographic information system(GIS)tools are used to identify locations that satisfy two-dimensional(2D)planar availability,and an obstacle assessment model of the approach/departure and transitional surfaces of the VTOL site is built to further screen the locations.The selected potential sites are used as input to the integer programming model,ensuring that the locations identified to establish the VTOL site are optimal.The impact of the number of VTOL sites,the user's transfer time at the VTOL sites,and the eVTOL pricing on the model solution is also discussed.Although this study uses Shenzhen as a research object,the proposed methodology is generalized and applicable to any other city or region,providing recommendations and references for initial planning and related operations of the UAM in selected areas.
