Air transport management research,concerned with all facets of aviation operations,policies,and strategies,is an essential element of making our aviation system more sustainable and preparing it for the challenges inh...Air transport management research,concerned with all facets of aviation operations,policies,and strategies,is an essential element of making our aviation system more sustainable and preparing it for the challenges inherent to the present and future.Based on a data-driven categorization of almost 2,000 papers published on the subject,we discuss the status quo in air transport management research.Through our data-driven categorization we have identified 15 broad topics.For each topic,we provide a description of the state of the art and propose 2-3 chal-lenges,respectively.Overall,our study provides a set of 35 challenges to the research community.Accordingly,we hope and believe that our study makes a valuable contribution,mainly by guiding the air transport manage-ment research community towards a delineated work plan on the research landscape of air transport as well as the present challenges,ultimately helping to improve the global air transport system.展开更多
For the purpose of exploring the factors affecting injury severity of children and adolescents involved in traffic crashes in Greece,disaggregate crash data including 13,431 involving children and adolescents from all...For the purpose of exploring the factors affecting injury severity of children and adolescents involved in traffic crashes in Greece,disaggregate crash data including 13,431 involving children and adolescents from all regions of Greece for the period 2006–2015 were utilized.In order to identify factors affecting injury severity and account for potential unobserved heterogeneity,a series of mixed logit models were utilized.To explore and address potential temporal instability of crash-related risk factors,the likelihood ratio test was applied.Results indicated that night crashes,crashes outside urban areas as well as crashes involving bicycles or powered-two-wheelers are associated with higher injury severity of children and adolescents.Interestingly,crashes involving pedestrians are associated with lower injury severity than head-on collisions and run-off-road collisions with fixed objects.Side and sideswipe crashes also result in lower injury severities.The likelihood ratio test indicated that crash-related factors are instable when comparing the models utilizing data before and after 2010 respectively.This study contributes to the current knowledge in the field,as to the best of our knowledge this is the first study that addresses unobserved heterogeneity when analyzing child and adolescent injury severity.Overall,the findings of this study provide useful insights and could assist in unveiling crash risk factors and prioritize programs and measures to promote road safety of children and adolescents.展开更多
Social Media have increasingly provided data about the movement of people in cities making them useful in understanding the daily life of people in different geographies.Particularly useful for travel analysis is when...Social Media have increasingly provided data about the movement of people in cities making them useful in understanding the daily life of people in different geographies.Particularly useful for travel analysis is when Social Media users allow(voluntarily or not)tracing their movement using geotagged information of their communication with these online platforms.In this paper we use geotagged tweets from 10 cities in the European Union and United States of America to extract spatiotemporal patterns,study differences and commonalities among these cities,and explore the nature of user location recurrence.The analysis here shows the distinction between residents and tourists is fundamental for the development of city-wide models.Identification of repeated rates of location(recurrence)can be used to define activity spaces.Differences and similarities across different geographies emerge from this analysis in terms of local distributions but also in terms of the worldwide reach among the cities explored here.The comparison of the temporal signature between geotagged and non-geotagged tweets also shows similar temporal distributions that capture in essence city rhythms of tweets and activity spaces.展开更多
基金National Natural Science Founda-tion of China(Grant No.U2233214,No.62250710166)European Research Council(ERC)un-der the European Union’s Horizon 2020 research and innovation pro-gramme(grant agreement No 851255)+1 种基金María de Maeztu project CEX2021-001164-MMCIN/AEI/10.13039/501100011033.
文摘Air transport management research,concerned with all facets of aviation operations,policies,and strategies,is an essential element of making our aviation system more sustainable and preparing it for the challenges inherent to the present and future.Based on a data-driven categorization of almost 2,000 papers published on the subject,we discuss the status quo in air transport management research.Through our data-driven categorization we have identified 15 broad topics.For each topic,we provide a description of the state of the art and propose 2-3 chal-lenges,respectively.Overall,our study provides a set of 35 challenges to the research community.Accordingly,we hope and believe that our study makes a valuable contribution,mainly by guiding the air transport manage-ment research community towards a delineated work plan on the research landscape of air transport as well as the present challenges,ultimately helping to improve the global air transport system.
基金funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 754462
文摘For the purpose of exploring the factors affecting injury severity of children and adolescents involved in traffic crashes in Greece,disaggregate crash data including 13,431 involving children and adolescents from all regions of Greece for the period 2006–2015 were utilized.In order to identify factors affecting injury severity and account for potential unobserved heterogeneity,a series of mixed logit models were utilized.To explore and address potential temporal instability of crash-related risk factors,the likelihood ratio test was applied.Results indicated that night crashes,crashes outside urban areas as well as crashes involving bicycles or powered-two-wheelers are associated with higher injury severity of children and adolescents.Interestingly,crashes involving pedestrians are associated with lower injury severity than head-on collisions and run-off-road collisions with fixed objects.Side and sideswipe crashes also result in lower injury severities.The likelihood ratio test indicated that crash-related factors are instable when comparing the models utilizing data before and after 2010 respectively.This study contributes to the current knowledge in the field,as to the best of our knowledge this is the first study that addresses unobserved heterogeneity when analyzing child and adolescent injury severity.Overall,the findings of this study provide useful insights and could assist in unveiling crash risk factors and prioritize programs and measures to promote road safety of children and adolescents.
基金partially funded by the DAAD Project(No.57474280)Verkehr-SuTra:Technologies for Sustainable Transportation,within the Programme:A New Passage to India—Deutsch-Indische Hochschulkooperationen ab 2019the German Federal Ministry of Education and Research,Bundesministerium für Bildung und Forschung(BMBF),project FuturTrans:Indo-German Collaborative Research Center on Intelligent Transportation Systemsby the European Union's Horizon 2020 research and innovation programme under grant agreement No.815069(project MOMENTUM(Modelling Emerging Transport Solutions for Urban Mobility)).
文摘Social Media have increasingly provided data about the movement of people in cities making them useful in understanding the daily life of people in different geographies.Particularly useful for travel analysis is when Social Media users allow(voluntarily or not)tracing their movement using geotagged information of their communication with these online platforms.In this paper we use geotagged tweets from 10 cities in the European Union and United States of America to extract spatiotemporal patterns,study differences and commonalities among these cities,and explore the nature of user location recurrence.The analysis here shows the distinction between residents and tourists is fundamental for the development of city-wide models.Identification of repeated rates of location(recurrence)can be used to define activity spaces.Differences and similarities across different geographies emerge from this analysis in terms of local distributions but also in terms of the worldwide reach among the cities explored here.The comparison of the temporal signature between geotagged and non-geotagged tweets also shows similar temporal distributions that capture in essence city rhythms of tweets and activity spaces.
