Olympic Sports Science, COPPE-UFRJ, June 2015.

  Big Data in Science, Hypothesis as Data, ERBD, São Francisco do Sul, 2014.

  Gerência de Dados para eScience, Workshop eScience, Fortaleza, CE, Brazil, 2009.

  Data Managment for DES-Brazil, CBPF, Rio de Janeiro, Brazil, 2009.

  eScience data and knowledge management, Facultés Notre-Dame de la Paix, Informatics Department, May 2008, Namur, Belgium.

  NeuroscienceDB, Hogeschool of Gronongen, 19th December 2007, Groningen, The Netherlands.

  QoS Enable Semantic Web Service Discovery, University of Calgary, Computer Science Department, 10th September 2007, Canada.

  Adaptive Query Processing: A challenge for internet-based applications, Symposium Intl Guest Lectures on Computer Science and related fields, Hogeschool van Utrecht, Fall November 14th 2005, The Netherlands.

  Adaptive Query Processing: A challenge for internet-based applications, Manchester University, Computer Science Department, Annual Seminar Series, October 19th, 2005.

  Adaptive Query Processing with Expensive Predicates, Symposium Intl Guest Lectures on Computer Science and related fields, Hogeschool van Ultrecht, Fall October 4th 2004, The Netherlands.

  Dynamic algorithms for the evaluation of queries with expensive predicates, Atlas Group, INRIA-Rennes, Institut de Recherche en Informatique de Nantes (IRIN), February 2004.

  Distributed Visualization in Grid Environment, Fábio Porto, Gilson Antônio Giraldi, LNCC - Seminários, 1st December 2003, Petrópolis, Brazil.