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sebastián ferrada sebastián ferrada s academic site search sebastián ferrada s academic site sebastián ferrada s academic site home publications projects self promotion news press talks contact cv light dark automatic sebastián ferrada assistant professor millennium institute for foundational research on data national center for artificial intelligence research data artificial intelligence initiative department of computer science universidad de chile biography i m sebastián an assistant professor at the data artificial intelligence initiative and the department of computer science at universidad de chile where i research knowledge graphs focusing on their extraction management and use for querying browsing and ai applications i m also a junior researcher at the institute for foundational research on data imfd and a collaborating researcher at the national center for artificial intelligence research cenia previously i was a postdoctoral researcher in the department of computer science at universidad de chile and before that at the department of computer and information science at linköping university sweden i completed my phd at universidad de chile in 2021 proposing a self similarity join algorithm and new similarity join and clustering operators for sparql during my master s i created imgpedia a large scale multimedia knowledge graph that took first place in the 25th latin american master thesis competition clei 2017 i sit on the editorial boards of the open access journal transactions on graph data and knowledge and the semantic web journal i currently lead a fondecyt project on knowledge graph extraction from tabular sources my work has received several awards including best paper at coopis 2023 and both best student paper resources track and best poster at iswc 2017 interests multimedia databases graph databases and knowledge graphs federated data management education phd in computer science 2021 universidad de chile msc in computer science 2017 universidad de chile beng in computer science 2017 universidad de chile featured publications sebastián ferrada aidan hogan benjamin bustos march 2024 semantic web journal similarity joins and clustering for sparql the sparql standard provides operators to retrieve exact matches on data such as graph patterns filters and grouping this work proposes and evaluates two new algebraic operators for sparql 1 1 that return similarity based results instead of exact results first a similarity join operator is presented which brings together similar mappings from two sets of solution mappings second a clustering solution modifier is introduced which instead of grouping solution mappings according to exact values brings them together by using similarity criteria for both cases a variety of algorithms are proposed and analysed and use case queries that showcase the relevance and usefulness of the novel operators are presented for similarity joins experimental results are provided by comparing different physical operators over a set of real world queries as well as comparing our implementation to the closest work found in the literature dbsimjoin a postgresql extension that supports similarity joins for clustering synthetic queries are designed in order to measure the performance of the different algorithms implemented pdf cite code sijin cheng sebastián ferrada olaf hartig august 2023 in coopis 23 considering vocabulary mappings in query plans for federations of rdf data sources federations of rdf data sources offer great potential for queries that cannot be answered by a single data source however querying such federations poses several challenges one of which is that different but semantically overlapping vocabularies may be used for the respective rdf data since the federation members usually retain their autonomy this heterogeneity cannot simply be homogenized by modifying the data in the data sources therefore handling this heterogeneity becomes a critical aspect of query planning and execution we introduce an approach to address this challenge by leveraging vocabulary mappings for the processing of queries over federations with heterogeneous vocabularies this approach not only translates sparql queries but also preserves the correctness of results during query execution we demonstrate the effectiveness of the approach and measure how the application of vocabulary mappings affects on the performance of federated query processing pdf cite code sebastián ferrada benjamin bustos aidan hogan october 2017 in iswc 2017 imgpedia a linked dataset with content based analysis of wikimedia images imgpedia is a large scale linked dataset that incorporates visual information of the images from the wikimedia commons dataset it brings together descriptors of the visual content of 15 million images 450 million visual similarity relations between those images links to image metadata from dbpedia commons and links to the dbpedia resources associated with individual images in this paper we describe the creation of the imgpedia dataset provide an overview of its schema and statistics of its contents offer example queries that combine semantic and visual information of images and discuss other envisaged use cases for the dataset pdf cite code dataset recent publications benito fuentes sebastián vergara sebastián ferrada 2026 native graph neural network training in millenniumdb in amw 2026 pdf cite project project julián arenas guerrero sebastián ferrada sebastián vergara olaf hartig 2026 rml 1 2 aligning rml with rdf 1 2 triple terms and reifying triples in dmkg 26 pdf cite code project felipe avendaño jean paul duchens sebastián ferrada matías toro 2026 frogql worst case optimal joins and type driven optimization for lightweight gql in iswc 2026 pdf cite code project nicolás barrionuevo ri díaz benjamín farías sebastián ferrada alejandro grez juan reutter hernan sarmiento agustín urrutia 2026 maqui ai knowledge graphs and graphrag to manage legal documents in iswc 2026 industry track pdf cite project julián arenas guerrero sebastián ferrada 2025 cottas columnar triple table storage for efficient and compressed rdf management in iswc 2025 pdf cite code project vicente calisto sebastián ferrada gonzalo navarro juan l reutter juan pablo sánchez domagoj vrgoc 2025 graph querying or similarity search both in iswc 2025 pdf cite project slides sebastián ferrada 2024 extracting graphs from tables via conceptual models in international semantic web conference poster and demo track pdf cite valentina esteban ivana bachmann sebastián ferrada 2024 application of graph neural networks for representing and analyzing internet topology via the bgp protocol in acm internet measurement conference poster track pdf cite matías lópez sebastián ferrada aidan hogan 2024 erdoc a web interface for entity relation modelling in dataed 24 pdf cite doi renzo angles vicente calisto javiera díaz sebastián ferrada aidan hogan alexander pinto juan reutter carlos rojas henry rosales méndez hernan sarmiento etienne toussaint domagoj vrgoc 2024 telarkg a knowledge graph of chile s constitutional process in grades nda 24 pdf cite project doi see all publications projects jan 1 2025 knowledge graph extraction from tabular sources fondecyt iniciación 2025 financiado por anid oct 27 2024 desarrollo de procesos de inteligencia artificial en bases de datos de grafos proyecto u inicia financiado por la vicerrectoría de investigación y desarrollo de la u de chile self promotion runner up best demonstration award for the demonstration millenniumdb a multi modal multi model graph database engine at sigmod pods 24 jun 13 2024 website best paper award for the paper considering vocabulary mappings in query plans for federations of rdf data sources at the 29th international conference on cooperative information systems in 2023 oct 31 2023 website first prize for my thesis imgpedia a large scale knowledge base to perform visuo semantic queries over wikimedia commons images at the 25th latin american contest of master thesis organized by clei in 2018 oct 31 2018 website best student paper award resources track for the paper imgpedia a linked dataset with content based analysis of wikimedia images at the 16th international semantic web conference in 2017 oct 23 2017 website best poster award for the poster answering visuo semantic queries with imgpedia at the 16th international semantic web conference in 2017 oct 23 2017 website latest news sep 14 2026 three short papers from my masters students accepted at amw 2026 together with four of my masters students rodrigo molina benito fuentes sebastián vergara and valentina esteban we got three short papers accepted to the 17th alberto mendelzon international workshop on foundations of data management a nice venue for global top tier scientific exchange here in sudamerica my students will be presenting at the event in arequipa perú in november aug 21 2026 short paper accepted at the dmkg workshop iswc a shor paper with a proposal spec to update rml to produce rdf 1 2 graphs was accepted to the 2nd international workshop on data management for knowledge graphs joint work with julián arenas guerrero olaf hartig and my masters student sebastián vergara aug 6 2026 my first uchile master s student defended her thesis valentina esteban co advised with the wonderful ivana bachman defended her thesis on gnn based prediction of autonomous system relationship types and graduated with the highest mark congrats valentina aug 4 2026 iswc industry track paper accepted our short article describing maqui ai was accepted to the industry track of iswc 2026 maqui is an imfd start up that helps users find and navigate the legal bodies that apply to a given problem by combining a legal knowledge graph with graph augmented retrieval augmented generation jul 17 2026 iswc paper accepted our article frogql worst case optimal joins and type driven optimization for lightweight gql was accepted to the resources track of the 25th international semantic web conference i will be presenting it in bari italy in october jun 8 2026 fondef idea i d adjudicated under the direction of eduardo graells we will be developing colibrí a platform for data analysis and visualization for the municipality of independencia jun 1 2026 i m joining the department of computer science dcc as of today i am joining the dcc of universidad de chile as an assistant professor this complements my current position at the data and artificial intelligence initiative of the same university you can read more here in spanish mar 25 2026 editorial board member i was invited to join the editorial board of the semantic web journal i am very honoured see all news in the media oct 6 2026 inteligencia artificial localhost 851 podcast dcc universidad de chile episode 07 of the student run podcast of the department of computer science a conversation together with claudia lópez watch sep 15 2026 hace falta una regulación porque la ia no lo va a hacer por sí sola la mañana informativa 24 horas tv interview hosted by carla zunino on the rapid development of ai and the un s call to regulate it watch sep 15 2026 actualidad en inteligencia artificial buena costumbre prime radio metropolitan concepción interview on current affairs in ai hosted by mónica charpentier watch aug 27 2026 inteligencia artificial sus beneficios riesgos y el futuro que ya estamos construyendo la hora del taco radio universo with carola varleta and francesco gazzella we discussed bill gates remarks and his concerns about the impact of ai listen jul 30 2026 algún día abogados o médicos serán reemplazados por máquinas a bordo podcast radio runa la tercera universidad nacional andrés bello hosted by polo ramírez watch see all press appearances recent upcoming talks frogql worst case optimal joins and type driven optimization for lightweight gql oct 25 2026 bari italy follow frogql una base de datos de grafos que corre en el navegador sep 25 2026 6 00 pm auditorio d etigny beauchef 851 santiago chile slides follow case study qué hace un humano en un mundo de agentes y gemelos digitales may 31 2026 observatorio astronómico nacional cerro calán santiago chile slides follow modern graphs for modern apps mar 4 2026 madrid spain slides follow memory meaning and machines building the knowledge scaffolds of agentic ai dec 1 2025 9 15 am 10 00 am mexico city mexico slides follow keynote page see all events recent posts imgpedia la importancia de incluir multimedia en la web de datos imgpedia es una base de datos enlazados que extrae características visuales a las imágenes de wikimedia commons y que provee enlaces a dbpedia al contexto de la imagen permitiendo así realizar consultas visuo semánticas sebastián ferrada jul 5 2023 7 min read formas pokenormales al diseñar las relaciones que deben formar parte de un esquema relacional de bases de datos hay ciertos aspectos que se deben considerar de forma que se asegure que al agregar los datos en el esquema estos no presenten anomalías jul 5 2023 11 min read llaves y dependencias funcionales este post provee de una introducción al concepto de llaves y dependencias funcionales en el campo de la teoría de las bases de datos relacionales está guiado por ejemplos pero se presentan también algunas de las formalidades matemáticas sebastián ferrada dec 13 2020 6 min read contact sebastian dot ferrada at uchile dot cl beauchef 851 of bpo 518 santiago chile dm me 2026 me this work is licensed under cc by nc nd 4 0 published with wowchemy the free open source website builder that empowers creators cite copy download