This paper puts forward a dynamic version of the two-step floating catchment area (2SFCA) method,... more This paper puts forward a dynamic version of the two-step floating catchment area (2SFCA) method, which has gained acceptance in studies on spatial health care accessibility. Current implementations of the 2SFCA method are static in that they consider centroid-based night-time representations of the population. The proposed dynamic enhancement to the 2SFCA approach addresses this limitation by accounting for trip-chaining behavior. The presented method is illustrated in a case study of accessibility of day-care centers in the province East Flanders in Belgium. The results show significant spatial differences in accessibility between the static and dynamic version of the 2SFCA. They highlight the importance of giving heed to more complex travel behavior in cases where the need for detailed accessibility calculations is apparent.
Recently, much attention has been devoted to the quality of public transport and more specificall... more Recently, much attention has been devoted to the quality of public transport and more specifically to designating individuals and areas that suffer from public transport deficiencies. Various studies conducted in the domain of transport-related social exclusion have used geographical information systems (GIS) to unravel the linkage between social disadvantage, public transport needs and public transport provision. However, much of the empirical work to date is static because it describes what is accessible by public transit from a particular origin at a single point in time yet does not consider the temporal variability in accessibility levels at multiple origins. In answer to this limitation, this study puts forward a methodology for identifying public transit gaps by drawing on the latest accomplishments in the field of modelling time-continuous, schedule-based public transport. Therefore, General Transit Feed Specification (GTFS) datasets for bus, tram, metro and train as well as...
In answer to the economic, environmental and social externalities associated with car-oriented de... more In answer to the economic, environmental and social externalities associated with car-oriented developments, strengthening the position of public transportation has received a growing policy and academic interest. In addition, increasing the attractiveness of public transport benefits transport-related equity, as more opportunities are made accessible to population segments unable to commute by car. To date, however, research in this domain has primarily addressed the spatial distribution of the modal disparity in access by public and private motorized transport, while its temporal variability has received little attention. Based on the recent endeavors in computing time-continuous accessibility levels, the spatial as well as temporal modal disparity in access to job locations is calculated for the region of Flanders, Belgium. Therefore, the public transport provision is compared to the access by car at regular time intervals during a predefined time window (5 am – 11 pm). The resul...
Based on project experience over the last years, fibre reinforced ice has proven to be a strong a... more Based on project experience over the last years, fibre reinforced ice has proven to be a strong and suitable building material for temporary structures in a cold environment. Unlike traditional igloo structures, no stacked blocks are used. Instead, relatively thin shells are created by spraying subsequent thin layers of water mixed with cellulose fibres on inflatable formwork which is removed afterwards. This paper describes the overall design process and construction of a full-scale cellulose-ice composite structure, inspired by Felix Candela's famous reinforced concrete hypar shells. The project was built by university students and staff in the framework of an international project in Finland during the winter of early 2016.
This paper puts forward a dynamic version of the two-step floating catchment area (2SFCA) method,... more This paper puts forward a dynamic version of the two-step floating catchment area (2SFCA) method, which has gained acceptance in studies on spatial health care accessibility. Current implementations of the 2SFCA method are static in that they consider centroid-based night-time representations of the population. The proposed dynamic enhancement to the 2SFCA approach addresses this limitation by accounting for trip-chaining behavior. The presented method is illustrated in a case study of accessibility of day-care centers in the province East Flanders in Belgium. The results show significant spatial differences in accessibility between the static and dynamic version of the 2SFCA. They highlight the importance of giving heed to more complex travel behavior in cases where the need for detailed accessibility calculations is apparent.
Recently, much attention has been devoted to the quality of public transport and more specificall... more Recently, much attention has been devoted to the quality of public transport and more specifically to designating individuals and areas that suffer from public transport deficiencies. Various studies conducted in the domain of transport-related social exclusion have used geographical information systems (GIS) to unravel the linkage between social disadvantage, public transport needs and public transport provision. However, much of the empirical work to date is static because it describes what is accessible by public transit from a particular origin at a single point in time yet does not consider the temporal variability in accessibility levels at multiple origins. In answer to this limitation, this study puts forward a methodology for identifying public transit gaps by drawing on the latest accomplishments in the field of modelling time-continuous, schedule-based public transport. Therefore, General Transit Feed Specification (GTFS) datasets for bus, tram, metro and train as well as...
In answer to the economic, environmental and social externalities associated with car-oriented de... more In answer to the economic, environmental and social externalities associated with car-oriented developments, strengthening the position of public transportation has received a growing policy and academic interest. In addition, increasing the attractiveness of public transport benefits transport-related equity, as more opportunities are made accessible to population segments unable to commute by car. To date, however, research in this domain has primarily addressed the spatial distribution of the modal disparity in access by public and private motorized transport, while its temporal variability has received little attention. Based on the recent endeavors in computing time-continuous accessibility levels, the spatial as well as temporal modal disparity in access to job locations is calculated for the region of Flanders, Belgium. Therefore, the public transport provision is compared to the access by car at regular time intervals during a predefined time window (5 am – 11 pm). The resul...
Based on project experience over the last years, fibre reinforced ice has proven to be a strong a... more Based on project experience over the last years, fibre reinforced ice has proven to be a strong and suitable building material for temporary structures in a cold environment. Unlike traditional igloo structures, no stacked blocks are used. Instead, relatively thin shells are created by spraying subsequent thin layers of water mixed with cellulose fibres on inflatable formwork which is removed afterwards. This paper describes the overall design process and construction of a full-scale cellulose-ice composite structure, inspired by Felix Candela's famous reinforced concrete hypar shells. The project was built by university students and staff in the framework of an international project in Finland during the winter of early 2016.
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Papers by Greet Deruyter