David Chaves-Fraga
PhD Student at OEG
dachafra [at] gmail.com
PhD Student at OEG
dachafra [at] gmail.com
My PhD starts at the Ontology Engineering Group (OEG), in the area of data integration and with @ocorcho as my PhD advisor
OEG web pageWhite paper about our vision on transport and public services data sharing in the smart cities of Madrid and Ghent
Transport - White Paper Public Services - White PaperResearch visitor at Universidad de Chile and Center of Semantic Web Research (CIWS). I work with @claudiogutierrez during three months learning and experimenting with federated SPARQL queries and their performance
CIWSTransportDCAT-AP: A common metadata model for representing public transport at the European level
TransportDCAT-AP documentationI attend to the Open Summer of Code 2017 as one of the coaches of OASIS team. During one month we develop Tripscore, a route planning linked data client based on user preferences and historical data.
Open Summer of Code TripscoreInvited by @DVRansbeeck to present TransportDCAT-AP and the relevance of the metadata in the transport domain
Slides Civic Hack NightOne day visiting the IDLab of Ghent University invited by @pietercolpaert . The current state of my thesis is presented to the group and we discuss about SPARQL and semantic data integration.
Position paper "On the Role of the GRAPH Clause in the Performance of Federated SPARQL Queries" accepted at PROFILES2017 workshop, collocated with ISWC17
Demo paper "The tripscore Linked Data client: calculating specific summaries over large time series" accepted at DeSemWeb workshop, collocated with ISWC17
Demo paper "Providing Reliable Access to Real-Time and Historic Public Transport Data Using Linked Connections" accepted at Demo&Poster session ISWC17
GRAPH paper Tripscore demo paper LC demo paperWe celebrate the 1st GoF4R workshop, collocated with the 9th IT Combined Meeting in Cologne. I present the relevance of Semantic Interoperability in Transport Domain and we discussed in groups about different topics with relevant stakeholders from the domain.
Slides D4.1 DeliverableTripscore is selected as one of the projects for a 1 month dataton of the Madrid's council
I present in two workshops: the Tripscore demo paper at @DeSemWeb and the Graph position paper at @Profiles2017
Slides Tripscore Slides Graph@pietercolpaert @julianrojas and I present our demo paper about linked connections and historical data during the Poster&Demo session
Tripscore wins the 2nd prize in the DataMad. We included public transport data from the city of Madrid to recommend routes
Spanish TripscoreAfter one year identifying the limitations of the problem I would like to resolve in my thesis and doing some proofs of concepts, I finished 2017 discussing with @ocorcho about the next steps for 2018. At that moment I knew which would be the contributions of my thesis and the problem I would like to solve: Online query processing over joins in CSV files
Our paper "Cross-Evaluation of Term Extraction Tools by Measuring Terminological Saturation" was accepted at PP of ICTERI17.
PDFFrom a collaboration between Open Knowledge Belgium and Ontology Engineering Group, Open Summer of Code 2018 will turns into an International program and it will take place in Spain for the first time.
oSoc18 Spain Web Page oSoc18 TwitterOur paper "Refining Terminological Saturation using String Similarity Measures" was accepted to present during the conference.
PaperI start to develop RMLC, a RDF Mapping Language for heterogeneous CSV files.
RMLC GithubIn a collaboration with some colleagues of OEG, we write a paper for the SemStats Workshop (co-located with ISWC18) and we receive the best paper award. The paper is the first contribution about RMLC, the RMLC-Iterator for statistics data.
RMLC-Iterator paperI attend to the International Semantic Web Research School 2018 being part of the Jedis team, coordinated by @Maria-Esther Vidal. The Jedis team research about Linked Data Validity in the context of Federated SPARQL queries. We receive the best paper award and the second best presentation.
Paper PresentationDuring two weeks in July, I coordinate the Open Summer of Code Spain 1Ed. 8 students were working on 3 real and innovation projects. During the Demo Day, more than 30 people came to see the projects and met the students.
Aftermovie oSoc18I start as assitant lecturer at UPM. First experience teaching in one bachelor course and two master courses, all focused on Linked Data and Semantic Web
My colleague Freddy and I visit IDLAB to meet the RML team for trying to find ways to collaborate. We present our last contributions on Virtual Knowledge Graph Generation
VKG Generation Morph-GraphQLOur proposals (i) Knowledge Graph Building Workshop (KGBW_2019) and (ii) Tutorial on Generating and Querying Virutal Knowledge Graphs from Heterogenous Data sources are accepted in ESWC2109. The KGBW2019 is a collaboration between RML team, OEG Data Integration Team and Juan Sequeda from Capsenta
VKG2019 KGBW2019Presentation of my contributions in Knowledge Graph Generation in the plenary meeting of the Spanish National Project Datos 4.0
Slides (Spanish)Our paper "Similar Terms Grouping Yields Faster Terminological Saturation" is accepted at ICTERI 2018 PP
PaperIn collaboration with RML Team we transform and extend the R2RML test-cases to RML. The scientific contribution is presented in the 1st Iberoamerican Knowledge Graphs and Semantic Web Conference
Paper Test-Cases Implementation-ReportI start a 4-months internship in the "Scientific Data Managment Group" leaded by Maria-Esther Vidal in TIB (Hannover). The first days I attend to the retreat of the group and present my work and plan for the internship
SlidesOur paper "morph-GraphQL: GraphQL Server Generation from R2RML Mappings" is accepted at Software Engineering and Knowledge Engineering Conference 2019 (SEKE2019). We win the best demo award, with a contribution on morph-GraphQL.
Scientific Paper Demo PaperIn the context of the KGBW2019 we write the "SAD Generator: eating our own dog food to generate KGs and websites for academic events" demo paper accepted at ESWC2019.
Demo Paper Soruce codeWe transform RMLC to Morph-CSV, a engine to enhance query translation over open tabular data exploiting implicit information on mappings and annotations
Source CodeIn collaboration with the semantics-transport community (IDLAB, POLIMI and CEFRIEL) we organise a workshop in SEMANTiCS Conference 2019:International Workshop On Semantics For Transport
Sem4TraWe present our suite of open tools for Virtual Knowledge Graph Generation during the tutoral: morph-CSV, morph-GraphQL, TADA and HELIO. The KBGW2019 is a success with more than 70 attendees and a keynote from Mariano Rodriguez-Muro from Google
VKG2019 MaterialSecond edition of Open Summer of Code Spain: 20 students and 7 coaches work on 6 innovative and digital projects during 4 weeks in July in La Nave (Madrid)
Website AftermovieIn collaboration with the SDM group, we develop a RML engine for an efficient transformation of multiple heterogenous datasources to a RDF-base knowledge graph
Source CodeOur paper "Towards a New Generation of Ontology Based Data Access" is accepted in the Special Issue of 10-years of the Semantic Web Journal (Q1)
Our paper "What are the Parameters that Affect the Construction of a Knowledge Graph?" is accepted at ODBASE2019. This is the first output of my internship at the SDM group (TIB).
Our demo paper "ONETT: Systematic Knowledge Graph Generation for National Access Points" is accepted at Sem4Tra. This is a output of the work made during Open Summer of Code in the context of the SNAP project.
Demo Paper