To identify time-space locations where public transit infrastructure fails to provide a reliable and timely alternative to private vehicles,this paper proposes a new travel demand-independent persistent homology-based...To identify time-space locations where public transit infrastructure fails to provide a reliable and timely alternative to private vehicles,this paper proposes a new travel demand-independent persistent homology-based method to locate and rank the severity of the modal travel desert.Persistent homology,which is a tool from algebraic topology,is incorporated and the severity of a transit desert ismeasured as a trade-off between its proximity to existing transit infrastructure and the travel time required to travel through it.The proposed method highlights entire regions of cities that are bereft of suitable public transit,providing reasonable estimates even in the absence of travel demand data.This paper presents the techniques and software tools used to study the Stockholm public transit network.The proposed method is potentially useful for city planners to consider the trade-off between how severe a bottleneck is and how difficult the bottleneck is to fix.展开更多
The international community has made significant efforts to flatten the COVID-19 curve,including predicting transmission[1,2],executing unprecedented global lockdowns and social distancing[3,4],promoting the wearing o...The international community has made significant efforts to flatten the COVID-19 curve,including predicting transmission[1,2],executing unprecedented global lockdowns and social distancing[3,4],promoting the wearing of facemasks and social distancing measures[5],and isolating confirmed cases and contacts[6].Because of the adverse consequences of these lockdown measures[7],many cities have reopened so they can rebuild their economies.However,as mobility has gradually returned towards normal,imported cases from unknown sources have disrupted the recovery situation,and cities are continually at high risk of new waves of infection[8,9]since airborne transmission is the dominant transmission route[10].展开更多
文摘To identify time-space locations where public transit infrastructure fails to provide a reliable and timely alternative to private vehicles,this paper proposes a new travel demand-independent persistent homology-based method to locate and rank the severity of the modal travel desert.Persistent homology,which is a tool from algebraic topology,is incorporated and the severity of a transit desert ismeasured as a trade-off between its proximity to existing transit infrastructure and the travel time required to travel through it.The proposed method highlights entire regions of cities that are bereft of suitable public transit,providing reasonable estimates even in the absence of travel demand data.This paper presents the techniques and software tools used to study the Stockholm public transit network.The proposed method is potentially useful for city planners to consider the trade-off between how severe a bottleneck is and how difficult the bottleneck is to fix.
基金support from the National Research FoundationPrime Minister’s Office+7 种基金Singapore under its Campus for Research Excellence and Technological Enterprise(CREATE)programmeThe Hong Kong Polytechnic University Strategic Hiring Scheme(P0036221)support from the Key Program of National Natural Science Foundation of China(41930648)supports from the Hong Kong Research Grants Council(15602619,15603920,and C7064-18GF)supports from the Hong Kong Research Grants Council(14605920,14611621,and C4023-20GF)support from the National University of SingaporeMinistry of Education,Tier 1 under WBS R-109-000-270-133Ministry of Natural Resources of the People’s Republic of China(GS(2021)7327)。
文摘The international community has made significant efforts to flatten the COVID-19 curve,including predicting transmission[1,2],executing unprecedented global lockdowns and social distancing[3,4],promoting the wearing of facemasks and social distancing measures[5],and isolating confirmed cases and contacts[6].Because of the adverse consequences of these lockdown measures[7],many cities have reopened so they can rebuild their economies.However,as mobility has gradually returned towards normal,imported cases from unknown sources have disrupted the recovery situation,and cities are continually at high risk of new waves of infection[8,9]since airborne transmission is the dominant transmission route[10].
