Harm Delva

dblp:249/3819 · DBLP profile ↗
← Back
5ranked-venue papers
2as first author
3since 2021 · last 2021
0000-0001-8272-0754ORCID · corroborated

Domains — the database's venue-derived domains; a paper can count in several

Software engineering, systems software and programming languages · 5 · 2 first-author · 3 since 2021Databases, data management, data science and information retrieval · 4 · 1 first-author · 2 since 2021
YearPublicationVenuePosition
2021 A File-Based Linked Data Fragments Approach to Prefix Search
Ruben Dedecker, Harm Delva, Pieter Colpaert, Ruben Verborgh
ICWE2
2021 Publishing Base Registries as Linked Data Event Streams
Dwight Van Lancker, Pieter Colpaert, Harm Delva, Brecht Van de Vyvere, Julián Rojas 0001, Ruben Dedecker, Philippe Michiels, Raf Buyle, Annelies De Craene, Ruben Verborgh
ICWE3
2021 Geospatially Partitioning Public Transit Networks for Open Data Publishing
abstract
Public transit operators often publish their open data in a data dump, but developers with limited computational resources may not have the means to process all this data efficiently. In our prior work we have shown that geospatially partitioning an operator’s network can improve query times for client-side route planning applications by a factor of 2.4. However, it remains unclear whether this works for all network types, or other kinds of applications. To answer these questions, we must evaluate the same method on more networks and analyze the effect of geospatial partitioning on each network separately. In this paper we process three networks in Belgium: (i) the national railways, (ii) the regional operator in Flanders, and (iii) the network of the city of Brussels, using both real and artificially generated query sets. Our findings show that on the regional network, we can make query processing 4 times more efficient, but we could not improve the performance over the city network by more than 12%. Both the network’s topography, and to a lesser extent how users interact with the network, determine how suitable the network is for partitioning. Thus, we come to a negative answer to our question: our method does not work equally well for all networks. Moreover, since the network’s topography is the main determining factor, we expect this finding to apply to other graph-based geospatial data, as well as other Link Traversal-based applications.
Harm Delva, Julián Rojas 0001, Pieter Colpaert, Ruben Verborgh
J. Web Eng.1
2020 Geospatial Partitioning of Open Transit Data
Harm Delva, Julián Rojas 0001, Pieter-Jan Vandenberghe, Pieter Colpaert, Ruben Verborgh
ICWE1
2020 Efficient Live Public Transport Data Sharing for Route Planning on the Web
Julián Rojas 0001, Dylan Van Assche, Harm Delva, Pieter Colpaert, Ruben Verborgh
ICWE3